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The present invention also encompasses a method for producing hematopoietic cells from progenitor cells, said method comprising inducing NPAS4 function in the progenitor cells. The present invention furthermore pertains to a method for producing cardiomyocytes from progenitor cells, said method comprising inhibiting NPAS4 function in the progenitor cell.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"}]},"abstract_lang":["en"],"has_abstract":true,"claim":{"en":[{"text":"A method for producing endothelial cells from progenitor cells, said method comprising inducing Neuronal PAS domain protein 4 (NPAS4) function in the progenitor cells.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"A method for producing hematopoietic cells from progenitor cells, said method comprising inducing NPAS4 function in the progenitor cells.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of claim 1, wherein the progenitor cells are embryonic stem cells (ESCs), induced pluripotent stem cells (iPS), mesodermal progenitor cells, hemangioblasts, endothelial progenitor cells (EPCs), fibroblasts or a mixture thereof.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of claim 2, wherein the progenitor cells are embryonic stem cells (ESCs), induced pluripotent stem cells (iPSs), mesodermal progenitor cells, hemangioblasts, angioblasts, hematopoietic stem cells (HSCs), or a mixture thereof.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of any one of claims 1 to 4, wherein the NPAS4 function is induced by\n (a) a polypeptide comprising or consisting of human NPAS4 or a species ortholog thereof; or \n (b) a nucleic acid molecule encoding the amino acid sequence of (a).","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of any one of claims 1 to 4, wherein the NPAS4 function is induced by\n (i) a polypeptide comprising or consisting of an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31; \n (ii) a polypeptide being at least 60% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs: 1 to 31; \n (iii) a polypeptide comprising at least 600 amino acids, wherein the N-terminal portion of said polypeptide is at least 80% identical to the N-terminal half of an amino acid sequence being selected from the group consisting of SEQ ID NOs: 1 to 31; \n (iv) a polypeptide being at least 20% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 outside the bHLH domain, the PAS1 domain and the PAS2 domain, being at least 75% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 inside the bHLH domain, and being at least 50% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 inside the PAS1 domain and the PAS2 domain; \n (v) a nucleic acid molecule encoding the polypeptide of any one of (i) to (iv); and/or \n (vi) a vector comprising the nucleic acid molecule of (v).","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"A method for producing cardiomyocytes from progenitor cells, said method comprising inhibiting NPAS4 function in the progenitor cell.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of claim 7, wherein the progenitor cells are embryonic stem cells (ESCs), induced pluripotent stem cells (iPSs), mesodermal progenitor cells, cardiomyocyte progenitor cells, or a mixture thereof.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of claim 7 or 8, wherein the NPAS4 function is inhibited by\n (a) a dominant negative mutant of NPAS4 or a species ortholog thereof or a nucleic acid molecule encoding the same; \n (b) an aptamer, a ribozyme, an antibody, a protein drug, or a small molecule inhibitor against NPAS-4 or a species ortholog thereof; and/or \n (c) a siRNA, a shRNA, a morpholino, a microRNA, or an antisense nucleic acid specifically interacting with a nucleic acid molecule encoding NPAS-4 or a species ortholog thereof.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The method of any one of claims 1 to 9 being an ex vivo or in vitro method.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"A cell produced by the method of any one of claims 1 to 10.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"A nucleic acid molecule encoding a transcription factor having Npas4-like function, wherein the nucleic acid molecule is selected from the group consisting of\n (i) a nucleic acid molecule encoding the amino acid sequence of SEQ ID NO: 25; \n (ii) a nucleic acid molecule comprising or consisting of SEQ ID NO: 32; \n (iii) a nucleic acid molecule encoding an amino acid sequence being at least 70% identical to SEQ ID NO: 25; \n (iv) a nucleic acid molecule encoding an amino acid sequence comprising at least 600 amino acids, wherein the N-terminal portion of said polypeptide is at least 80% identical to the N-terminal half of the amino acid sequence of SEQ ID NO: 32; \n (v) a nucleic acid molecule encoding an amino acid sequence being at least 60% identical to the amino acid sequence of SEQ ID NO: 25 outside the bHLH domain, the PAS1 domain and the PAS2 domain, being at least 90% identical to the amino acid sequence of SEQ ID NO: 25 inside the bHLH domain, and being at least 80% identical to the amino acid sequence of SEQ ID NO: 25 inside the PAS1 domain and the PAS2 domain; or \n (vi) a vector comprising the nucleic acid molecule of any one of (i) to (v).","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"A polypeptide encoded by the nucleic acid molecule of claim 12.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"A pharmaceutical composition comprising\n (i) the polypeptide and/or the nucleic acid molecule as defined in claim 5; or the polypeptide, the nucleic acid molecule, and/or the vector as defined in claim 6; and/or \n (ii) the cell of claim 11, the nucleic acid molecule of claim 12, the polypeptide of claim 13, or a combination thereof.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"},{"text":"The polypeptide and/or the nucleic acid molecule as defined in claim 5; or the polypeptide, the nucleic acid molecule, the vector as defined in claim 6; or the cell of claim 11, the nucleic acid molecule of claim 12, the polypeptide of claim 13, or a combination thereof for use in (i) inducing angiogenesis, or (ii) treating a disease selected from atherosclerotic diseases, peripheral arterial disease, wound healing disorders, stroke, infertility, scleroderma, ulcers, diabetic vascular complications, erectile dysfunction and heart disease.","lang":"en","source":"EPO_FULLTEXT","data_format":"ORIGINAL"}]},"claim_lang":["en"],"has_claim":true,"description":{"en":{"text":"The present invention relates to a method for producing endothelial cells from progenitor cells, said method comprising inducing NPAS4 function in the progenitor cells. The present invention also encompasses a method for producing hematopoietic cells from progenitor cells, said method comprising inducing NPAS4 function in the progenitor cells. The present invention furthermore pertains to a method for producing cardiomyocytes from progenitor cells, said method comprising inhibiting NPAS4 function in the progenitor cells. In this specification, a number of documents including patent applications and manufacturer's manuals is cited. The disclosure of these documents, while not considered relevant for the patentability of this invention, is herewith incorporated by reference in its entirety. More specifically, all referenced documents are incorporated by reference to the same extent as if each individual document was specifically and individually indicated to be incorporated by reference. In the course of cellular differentiation within organisms pluripotent stem cells undergo further specialization into multipotent progenitor cells that then give rise to specialized cell types. Each specialized cell type is generated from the pluripotent stem cells/ multipotent progenitor cells by the expression of a specific subset of genes of the genome of these organisms. Cell differentiation is thus a transition of a cell from one cell type to another cell type which transition involves a switch from one pattern of gene expression to another pattern of gene expression. The genes involved in cellular differentiation are the subject of scientific investigations since decades, because knowing these genes provides inter alia the basis for artificially establishing differentiated cell types from progenitor cells. Thereby generated differentiated cell types are in particular useful for cell replacement therapy. In contrast to specialized cells pluripotent stem cells/ multipotent progenitor cells can be maintained and expanded as pure populations of undifferentiated cells for extended periods of time, possibly indefinitely, in culture. An unlimited source of cells and tissues for transplantation for the treatment of a broad spectrum of diseases becomes thereby available. Studies during the past decades have led to the development of culture conditions and protocols for the generation of a broad spectrum of specialized cell types from pluripotent stem cells/ multipotent progenitor cells. For example, culture conditions and protocols for the generation of mesoderm-derived cells, including hematopoietic, vascular, and cardiac cells are available. However, still many genes being involved in vivo in the generation of differentiated cell types from progenitor cells are unknown. Because the identification of each further gene being involved in cellular differentiation provides new or better possibilities of generating differentiated cell types from progenitor cells there is an ongoing need for the identification of further genes that may be used or targeted in culture conditions and protocols for the generation of specialized cell types. This need is addressed by the present invention. Accordingly the present invention relates in a first aspect to a method for producing endothelial cells from progenitor cells, said method comprising inducing NPAS4 function in the progenitor cells. In a second aspect the present invention relates to a method for producing hematopoietic cells from progenitor cells, said method comprising inducing NPAS4 function in the progenitor cells. The term \"progenitor (or precursor) cell\" as used herein refers to any cell having the capacity of differentiating into the desired specific type of cell. Thus, a progenitor cell specifies a cell which is partially or fully undifferentiated. In connection with the first aspect of the invention the progenitor cell has the capacity of differentiating into an endothelial cell. In connection with the second aspect of the invention the progenitor cell has the capacity of differentiating into a hematopoietic cell. A particular example of a progenitor cell is a stem cell. In general, stem cells can inter alia be distinguished from other progenitor cells in that stem cells can replicate indefinitely, whereas other progenitor cells can divide only a limited number of times. The progenitor cell is preferably a vertebrate cell, more preferably an amniote cell, and most preferably a mammalian cell. Non-limiting examples of mammals are cat, dog, horse, cattle, swine, goat, sheep, mouse, rat, monkey, ape and human. Within the order of mammals human is most preferred. Endothelial cells line the interior surface of blood vessels and lymphatic vessels. They thereby form an interface between circulating blood or lymph in the lumen and the rest of the vessel wall. Accordingly, endothelial cells have a barrier function. They are moreover involved in blood clotting, blood vessel formation, inflammation, blood pressure control and tissue repair. Endothelial cells in direct contact with blood are called vascular endothelial cells, whereas those in direct contact with lymph are known as lymphatic endothelial cells. Endothelial cells are of mesodermal origin. It is to be understood that in connection with the present invention the term \"endothelial cells\" refers to cells having essentially a mature endothelial cell phenotype. As is well-known in the art, cell differentiation methods in general do not result in cells which are identical to the corresponding in vivo differentiated cell-type. For instance, certain differences as regards the gene expression profile or even slight phenotypic differences may be observed as long as the artificially differentiated cell-type can in vitro and/or in vivo substitute the functions of in vivo differentiated cell-type. Cell differentiation methods generally aim at generating cells resembling the corresponding in vivo cell-type as closely as possible. Hematopoietic cells (also called blood cells or hematocytes) commonly designate the cell types, which can be found in the blood of vertebrates. These cell types fall into the three general categories of erythrocytes, leukocytes and thrombocytes. Hematopoietic cells can also be divided into the myeloid and lymphoid lineage. Myeloid cells include monocytes, macrophages, neutrophils, basophils, eosinophils, erythrocytes, dendritic cells, megakaryocytes and platelets. The hematopoietic cells of the invention are preferably myeloid cells. Lymphoid cells include T cells, B cells, and natural killer cells. Also hematopoietic cells are of mesodermal origin. More recent studies have revealed that a subset of endothelial cells, otherwise known as hemogenic endothelium, can give rise to hematopoietic stem cells (HSCs) that eventually generates the complete range of adult blood cells ( Hirschi (2012), Blood 119, 4823-7 and Ciau-Uitz et al (2014), Exp Hematol. 42, 669-83 ). For the reasons discussed herein above, in connection with the present invention the term \"hematopoietic cells\" refers to cells having essentially a mature hematopoietic cell phenotype, which can in vitro and/or in vivo substitute the functions of in vivo differentiated hematopoietic cells. Neuronal PAS domain protein 4 (NPAS4 and also known as NXF; Le-PAS; PASD10 or bHLHe79) is a member of the basic helix-loop-helix-PER (MIM 602260)-ARNT (MIM 126110)-SIM (see SIM2; MIM 600892) (bHLH-PAS) class of transcriptional regulators. This class of transcriptional regulators is involved in a wide range of physiologic and developmental events. NPAS4 contains in its N-terminal part a bHLH domain, followed by two PAS domains (PAS1 and PAS2) and a C-terminal activation domain. The amino acid sequence of human NPAS4 is shown in SEQ ID NO: 1 whereas SEQ ID NOs 2 to 31 are orthologs of human NPAS4. In more detail, SEQ ID NOs 2 to 9 are orthologs of human NPAS4 from other primates, including apes, old word monkeys, new world monkeys, and a prosimian. SEQ ID NOs 10 to 14 are orthologs of human NPAS4 from rodentia, including mouse and rat. SEQ ID NOs 15 to 24 are orthologs of human NPAS4 from mammals other than primates and rodentia, including evolutionary distinct mammalian species, such as Opossum or Tasmanian devil. SEQ ID NOs 25 to 31 are orthologs of human NPAS4 from vertebrates other than mammals, including a bird, reptiles and fish. It is of note that the ortholog of human NPAS4 from zebrafish (SEQ ID NO: 25) was not known from the prior art but has been isolated and sequenced in connection with the present invention; see examples herein below. As used herein the term \"inducing NPAS4 function\" designates the induction of the expression of the gene tal1 and/or the gene etv2. Species orthologs of zebrafish tal1 and etv2 can be found throughout vertebrates and the corresponding nucleotide sequences and encoded amino acid sequences are available from genome databases, such as ensemble or NCBI. The induction of the expression of the gene tal1 and/or the gene etv2 may either mean that before the induction of NPAS4 function no expression of these genes is observed or that upon the induction of NPAS4 function the expression of the gene tal1 and/or the gene etv2 is enhanced. Enhanced expression means with increasing preference that gene expression is enhanced at least 2-fold, at least 3-fold, at least 4-fold and at least 5-fold as compared to corresponding conditions in the absence of the induction of NPAS4 function. As is evident from the examples herein below, in the course of the differentiation of endothelial cells and hematopoietic cells in the embryogenesis of zebrafish the npas4-like (or napas4I) gene is expressed upstream of the expression of tal1 and etv2. In the absence of npas4-like no tal1 and etv2 expression is observed. Moreover, in the zebrafish cloche mutant ( Stainier et al., 1995, Development 121, 3141-3150 ), the expression of tal1 and etv2 can be restored by the human npas4 gene or the zebrafish ortholog npas4-like. Accordingly, the examples also provide means and methods for determining whether the gene tal1 and/or the gene etv2 is/are expressed or not, which means and method may be employed to check whether an NPAS4 function has been induced. The gene etv2 encodes the transcription factor ets variant 2 (ETV2 and is also know as Etsrp71). Mouse knockouts of etv2 are embryonic lethal, said lethal embryos lacking both hematopoietic and endothelial lineages ( Rasmussen (2013), Genesis, 51(7):471-80 ). ETV2 is furthermore known to govern endothelial development by regulating downstream transcriptional networks ( Behrens et al. (2014), Stem Cell Dev., 23(17):2004-13 ). For this reason, the term \"inducing NPAS4 function\" in connection with the first aspect of the invention more preferably designates the induction of the expression of the gene etv2 and most preferably of both genes etv2 and tal1. The gene tal1 encodes the T-cell acute lymphocytic leukemia protein 1 (TAL1 and is also know as SCL, TCL5 or bHLHa17). Tal1 is a transcriptionally complex gene that is expressed throughout development. The encoded helix-loop-helix (HLH) transcription factor TAL1 is expressed in hematopoietic and endothelial progenitor cells ( Hosur et al. (2013), PLoS One 8: e53426 ). The disruption of the tal1 gene in mice demonstrates that tal1 is essential for embryonic blood formation in vivo. Further loss-of-function studies show that tal1 is inter alia essential for the formation of hematopoietic stem cells, subsequent erythroid development, and yolk sac angiogenesis. For this reason, the term \"inducing NPAS4 function\" in connection with the second aspect of the invention more preferably designates the induction of the expression of the gene tal1 and most preferably of both genes tal1 and etv2. It is to be understood that in the above-described methods in general one or more differentiation factors are used. The term \"differentiation factor\" in accordance with the invention generally specifies any chemicals and compounds, such as proteins, nucleic acid molecules or small organic compounds, which when contacted with the progenitor cells leads to the desired more differentiated cellular stage, either when used alone or in combination with other differentiation factor(s). A preferred example of such a differentiation factor is a transcription factor or a gene encoding the same. The term \"transcription factor\" as used herein specifies a specific subclass of the umbrella term \"differentiation factors\". To explain further, a transcription factor specifies a protein that binds to specific DNA sequences and thereby controls the transcription of genetic information from DNA to mRNA. In turn, the protein encoded by the mRNA (directly or via the induction of further gene products) leads to a more differentiated cellular stage. Thus, a transcription factor falls within the definition of a differentiation factor in accordance with the invention. In accordance with the first and second aspect of the present invention at least one differentiation factor is capable of inducing NPAS4 function and is thus capable of inducing the expression of the gene tal1 and/or the gene etv2. However, also one or more additional differentiation factors are preferably used which additional differentiation factor(s) when contacted with the progenitor cells lead(s) to the desired more differentiated cellular stage. In accordance with the first aspect of the invention the additional differentiation factor(s) contribute to producing endothelial cells from progenitor cells and in accordance with the second aspect of the invention the additional differentiation factor(s) contribute to producing hematopoietic cells from progenitor cells. Various differentiation factors for obtaining endothelial cells are known in the art and non-limiting examples are Shh, VEGF, PLCγ, MEK, ERK, VEGFR-1-NRP-1 receptor complex, components of PI3K/AKT pathway, COUP-TFII, Foxc1/2, Notch signaling (e.g. Notch1, Notch4, Jag1, Jag2, and DII4), Sox7, Sox18, Prox1, ephrinB2, EphB4 and Nrp-1 ( Atkins et al. (2011), Arteriosclerosis, Thrombosis, and Vascular Biology, 31: 1476-1484 ). It has been recently demonstrated that combined TGFβ and canonical Wnt agonists are essential and sufficient for iPS/ES cell-to-mesoderm transition and that VEGF-KDR signalling alone is required for endothelial cell formation while further supplementation with FGF allows for colonial endothelial differentiation ( Wu et al. (2015), Scientific Reports, 5:9718:DOI: 10.1038/srep09718 ). It is therefore preferred that a differentiation factor being capable of inducing NPAS4 function is used in combination with VEGF-KDR signalling, more preferably in combination with one or more of TGFβ, a canonical Wnt agonist and VEGF-KDR signalling. Likewise various differentiation factors for obtaining hematopoietic cells are known in the art and non-limiting examples are (members of the) activins, BMPs (Bone Morphogenetic Proteins), common beta chain receptor family, common gamma chain receptor family, EGF family, FGF family, growth/differentiation factors (GDFs), hedgehog family, IGF family, IL-3, IL-6 family, PDGF family, SCF, Flt-3 ligand and M-CSF, VEGF family and Wnt family. Several transcription factors have been found to play critical roles in HSC (hematopoietic stem cells) physiology, including SCL (stem cell leukemia hematopoietic transcription factor), GATA-2, and Lmo-2, which are essential for primitive and definitive hematopoiesis, and AML-1 that is required for definitive hematopoiesis. Moreover, the transcription factors HoxB4 and Ikaros activate the nuclear form of Notch1, the cell cycle inhibitor P21, TGF/BMP-4 family members as well as TNFα receptor P55 signaling all being involved in the maintenance or promotion of the hematopoietic stem cell renewal ( Zhu and Emerson (2002), Oncogen, 21(21):3295-3313 ). It is therefore preferred that a differentiation factor being capable of inducing NPAS4 function is used in combination with one or more selected from SCL (stem cell leukemia hematopoietic transcription factor), GATA-2, Lmo-2 and AML-1, and more preferably in addition with one or more selected from HoxB4, Ikaros, Notch1, P21, TGF/BMP-4 family members and factors of TNFα receptor P55 signaling. In the methods of the present invention the differentiation factor(s) is/are generally introduced into the progenitor cells. The term \"introducing\" as used herein specifies the process of bringing a protein and/or nucleic acid sequence into a living cell, and in particular also into the cell nucleus, preferably by introducing means as defined herein below. The differentiation factor(s) may be introduced into the progenitor cells, for example, by microinjection, electroporation, lipofection and/or protein transduction All these introduction methods are well-established in the art. In this regard, the differentiation factor(s) to be introduced may either be isolated from their natural environment or recombinantly produced. A liposome used for lipofection is a small vesicle, composed of the same material as a cell membrane (i.e., normally a lipid bilayer e.g. out of phospholipids), which can be filled with one more protein(s) (e.g. Torchilin VP. (2006), Adv Drug Deliv Rev., 58(14):1532-55 ). To deliver a protein into a cell, the lipid bilayer of the liposome can fuse with the lipid bilayer of the cell membrane, thereby delivering the contained protein into the cell. It is preferred that the liposomes used in accordance with invention are composed of cationic lipids. The cationic liposome strategy has been applied successfully to protein delivery ( Zelphati et al. (2001), J. Biol. Chem. 276:35103-35110 ). As known in the art, the exact composition and/or mixture of cationic lipids used can be altered, depending upon the protein(s) of interest and the cell type used ( Feigner et al. (1994), J. Biol. Chem., 269:2550-2561 ). Protein transduction specifies the internalisation of proteins into the cell, from the external environment ( Ford et al (2001), Gene Therapy, 8:1-4 ). This method relies on the inherent property of a small number of proteins and peptides (preferably 10 to 16 amino acids long) being able to penetrate the cell membrane. The transducing property of these molecules can be conferred upon proteins which are expressed as fusions with them and thus offer, for example, an alternative to gene therapy for the delivery of therapeutic proteins into target cells. Commonly used proteins or peptides being able to penetrate the cell membrane are, for example; the antennapedia peptide, the herpes simplex virus VP22 protein, HIV TAT protein transduction domain, peptides derived from neurotransmitters or hormones, or a 9xArg-tag. Microinjection refers to the process of using a glass micropipette to introduce substances at a microscopic or borderline macroscopic level into a single living cell. Electroporation relies on a significant increase in the electrical conductivity and permeability of the cell plasma membrane caused by an externally applied electrical field. By increasing permeability, protein (or peptides or nucleic acid sequences) can be introduced into the living cell. It is demonstrated in the examples herein below that Npas4-like is essential for the formation of endothelial cells and hematopoietic cells in zebrafish. Endothelial cells and hematopoietic cells are built from common progenitor cells called hemangioblasts. In more detail, the zebrafish cloche mutant is known to have an embryonic lethal phenotype, which is caused by the lack of the development of endothelial cells and hematopoietic cells from hemangioblasts. It was unexpectedly found in accordance with the present invention that the cloche zebrafish mutant can be rescued by zebrafish Npas4-like and even more unexpectedly that it could also be rescued by the human ortholog of Npas4-like NPAS4, despite the fact that zebrafish Npas4-like and human NPAS4 share less than 35% sequence identity. The cellular fate between endothelial cells and hematopoietic cells may be controlled, for example, by one or more of the above-discussed further differentiation factor(s). It therefore can be assumed that inducing NPAS4 function in progenitor cells promotes the differentiation into endothelial cells as well as hematopoietic cells. To the best knowledge of the inventors it was not known from the prior art that human NPAS4 or a species ortholog thereof plays a role in the differentiation of endothelial cells and hematopoietic cells from progenitor cells. As will be further discussed herein below, the identity and sequence of zebrafish Npas4-like was even not known from the prior art. In accordance with a preferred embodiment, the method of the first and second aspect of the invention further comprises isolating the endothelial cells or the hematopoietic cells, respectively. In the above-described methods of the invention not each progenitor cell may be transformed into an endothelial cell or hematopoietic cell, respectively. For example, some cells may undergo cell death (i.e. apoptosis) or cells may stop differentiation at an intermediate stage. Any such cells that were not transformed into an endothelial cell or a hematopoietic cell, respectively, may be removed and the endothelial cells or the hematopoietic cells, respectively, may be isolated. Methods for isolating cells are well known in the state of the art and comprise tecniques such as FACS (fluorescence activated cell sorting), sucrose gradient centrifugation, (laser) microdissection, single cell dilution, and Magnetic Labeled Bead Cell Separation. FACS is a method for sorting a heterogeneous mixture of biological cells into two or more containers, one cell at a time, based upon the specific light scattering and fluorescent characteristics of each cell. For this purpose a cell specific marker. e.g. a specific endothelial or hematopoietic cell-surface marker may be labeled with a fluorescent dye like FLAG, GFP, YFP, RFP, dTomato, cherry, Cy3, Cy5, Cy 5.5., Cy7, AMCA, Tamra, Texas Red, rhodamine, Alexa fluors, FITC or TRITC. Endothelial cell-surface markers include but are not limited to VE-Cadherin, CD31/PECAM-1, CD34, CD117/c-kit, CXCR4, MCAM/CD146 S1P1/EDG-1, S1P2/EDG-5, S1P3/EDG-3, S1P4/EDG-6, S1P5/EDG-8, E-Selectin/CD62E, E-Selectin (CD62E)/P-Selectin (CD62P), Tie-2, VCAM-1/CD106, ETSRP, VEGF R1/Flt-1 and VEGF R2/KDR/Flk-1. Also hematopoietic cell-surface markers, including cell-surface markers being specific for the different lineages and types of hematopoietic cells are known and, for example, summarized in Attar (2014), Global Journal of Hematology and Blood Transfusion, 1:20-28 and Takafumi Yokota et al. (2012), Markers for Hematopoietic Stem Cells: Histories and Recent Achievements, Advances in Hematopoietic Stem Cell Research, Dr. Rosana Pelayo (Ed.), ISBN: 978-953-307-930-1, InTech . Sucrose gradient centrifugation is a centrifugation technique which separates compounds according to their density along a sucrose density gradient which is typically created overlaying lower concentrations of sucrose on higher concentrations in a centrifuge tube. Single cell dilution is a technique of diluting cells, preferably in culture medium until a concentration is reached that allows to separate a single cell in a separated vial. Magnetic Labeled Bead Cell Separation is a commercial system available from Miltenyi Biotec (MACS), Bergisch Gladbach, Germany. In accordance with a preferred embodiment of the first aspect of the invention, the progenitor cells are embryonic stem cells (ESCs), induced pluripotent stem cells (iPS), mesodermal progenitor cells, hemangioblasts, endothelial progenitor cells (EPCs), fibroblasts or a mixture thereof. Embryonic stem cells (ESCs) are pluripotent stem cells derived from the inner cell mass of a blastocyst, an early-stage preimplantation embryo. While the derivation of human ESCs cells initially required the destruction of ex utero embryos, it is now possible to generate ESCs by techniques which do not interfere with the embryo's developmental potential, such as by a single-cell biopsy ( WO 2003/046141 , Thomson et. al (1998), Science 282 (1145): 1145-1147 , Thomson et al. (1998), Science 282 (5391): 1145-7 , Klimanskaya et al., 2006, Nature 444:481-485 ). The human ESCs herein were/are accordingly preferably prepared by techniques which do not require the destruction of a human embryo and/or do not interfere with the human embryo's developmental potential. Specific examples are the cell lines CHB-1, CHB-2, or CHB-3. Induced pluripotent stem cells (also known as iPS cells or iPSCs) are a type of pluripotent stem cell that can be generated directly from adult cells. The first protocol for the generation of iPSCs was established in 2006 ( Takahashi et al. (2006), Cell, 126(4):663-676 ) and today various protocols are available in the art. Since iPSCs can be derived directly from adult tissues, they not only bypass the need for embryos, but also can be made in a patient-matched manner. This means that each individual could have their own pluripotent stem cell line. Mesodermal progenitor cells may be derived, for example, from adult human bone marrow ( Trombi et al. (2009), Stem Cells Dev, 18(8):1227-34 ). They can easily be induced to differentiate into mature mesenchymal stromal cells (MSCs) or into endothelial cells. Hemangioblast are multipotent progenitor cells that can differentiate into both hematopoietic and endothelial cells ( A. Cumano, I. Godin: Ontogeny of the hematopoietic system. In: Annual review of immunology. 25, 2007, p.745-785 ). Hemangioblasts have been first extracted from embryonic cultures and can be manipulated, for example, by cytokines to differentiate into the hematopoietic or endothelial cell lineage. Endothelial progenitor cells (EPCs) are capable of generating phenotypically and functionally competent endothelial cells and can inter alia be found in the blood ( Pelosi et al. (2014), Blood Cells, Molecules, and Diseases, 52(4):186-194 ). Also fibroblasts can serve as progenitor cells as they can be induced to become endothelial cells capable of angiogenesis and reendothelialization in tissue-engineered vessels ( Margarati el al. (2012), PNAS, 109(34):13793-8 ). In accordance with a preferred embodiment of the second aspect of the invention, the progenitor cells are embryonic stem cells (ESCs), induced pluripotent stem cells (iPSs), mesodermal progenitor cells, hemangioblasts, angioblasts, hematopoietic stem cells (HSCs), or a mixture thereof. Angioblasts may be isolated from embryos and are the earliest formative tissue from which blood cells and blood vessels arise in further embryogenesis ( Kovacic et al. (2008), Trends Cardiovasc Med, 18(2):45-51 ). Hematopoietic stem cells (HSCs) give rise to all the other more differentiated hematopoietic cells through the process of haematopoiesis. They are derived from mesoderm and are located in adults in the red bone marrow, which is contained in the core of most bones. In accordance with a preferred embodiment of the first and second aspect of the invention the NPAS4 function is induced by (a) a polypeptide comprising or consisting of human NPAS4 or a species ortholog thereof; or (b) a nucleic acid molecule encoding the amino acid sequence of (a). The term \"polypeptide\" as used herein describes linear molecular chains of amino acids, including single chain proteins or their fragments, containing generally more than 50 amino acids. Polypeptides may further form oligomers consisting of at least two identical or different molecules. The corresponding higher order structures of such multimers are, correspondingly, termed homo- or heterodimers, homo- or heterotrimers etc. Furthermore, peptidomimetics of such polypeptides where amino acid(s) and/or peptide bond(s) have been replaced by functional analogs are also encompassed by the invention. Such functional analogues include all known amino acids other than the 20 gene-encoded amino acids, such as selenocysteine. The term \"polypeptide\" also refers to naturally modified polypeptides where the modification is effected e.g. by glycosylation, acetylation, phosphorylation and similar modifications which are well known in the art. As mentioned, the amino acid sequence of human NPAS4 is shown in SEQ ID NO: 1 and species orthologs thereof in SEQ ID NOs 2 to 31. Orthologs (or orthologues) are genes in different species that evolved from a common ancestral gene by speciation. In general, orthologs retain the same or essentially same function in the course of evolution. It is shown in the examples herein below that in the cloche mutant of zebrafish human NPAS4 (SEQ ID NO: 1) can substitute the mutated zebrafish Npas4-like (SEQ ID NO: 25). For this reason human NPAS4 may be replaced by any species ortholog thereof. Among sequenced and annotated genomic sequences orthologs can be identified by routine methods, such as those described in Valender (2010), Methods, 49(1): 50-55 . The species ortholog of human NPAS4 is preferably a verterbrate ortholog of human NPAS4, more preferably a tetrapoda ortholog of human NPAS4, even more preferably a mammalian ortholog of human NPAS4, and most preferably a primate ortholog of human NPAS4. NPAS4 was found to heterodimerize with ARNT (aryl hydrocarbon receptor nuclear translocator), ARNT2 or ARNTL (aryl hydrocarbon receptor nuclear translocator-like protein). For this reason it is preferred that NPAS4 function is induced by a polypeptide comprising or consisting of human NPAS4 or a species ortholog thereof in combination with one or more selected from human ARNT, ARNT2, ARNTL or a species ortholog of one of human ARNT, ARNT2 and ARNTL. In this regard it is preferred that all polypeptides are from the same order (such as primates) and more preferably from the same species (such as human). Instead of or in addition to the polypeptides corresponding nucleic acid molecules encoding the desired amino acid sequences may be used. The term \"nucleic acid molecule\" will be further defined herein below. In accordance with a preferred embodiment of the first and second aspect of the invention the NPAS4 function is induced by (i) a polypeptide comprising or consisting of an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31; (ii) a polypeptide being at least 60% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs: 1 to 31; (iii) a polypeptide comprising at least 600 amino acids, wherein the N-terminal portion of said polypeptide is at least 80% identical to the N-terminal half of an amino acid sequence being selected from the group consisting of SEQ ID NOs: 1 to 31; (iv) a polypeptide being at least 20% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 outside the bHLH domain, the PAS1 domain and the PAS2 domain, being at least 75% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 inside the bHLH domain, and being at least 50% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 inside the PAS1 domain and the PAS2 domain; (v) a nucleic acid molecule encoding the polypeptide of any one of (i) to (iv); and/or (vi) a vector comprising the nucleic acid molecule of (v). It is to be understood that the means for NPAS4 function as defined in items (i) to (vi) are capable of inducing NPAS4 function. The meaning of \"inducing NPAS4 function\" has been defined herein above in greater detail and is in particular amenable for combination with the above preferred embodiment. The polypeptide of item (ii) above is with increasing preference as at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 92.5%, at least 95%, at least 98% and at least 99% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31. The polypeptide of item (iii) above is with increasing preference at least 85%, at least 90%, at least 92.5%, at least 95%, at least 98% and at least 99% identical to the N-terminal half of an amino acid sequence selected from the group consisting of SEQ ID NOs 1 to 31. The term \"N-terminal half\" means the first 50% of the entire amino acid sequence of an amino acid sequence selected from the group consisting of SEQ ID NOs 1 to 31. For example, SEQ ID NO: 1 comprises 802 amino acids and the \"N-terminal half\" consequently consists of amino acids 1 to 401 of SEQ ID NO: 1. SEQ ID NO: 31 comprises 647 amino acids and the \"N-terminal half\" consequently consists of amino acids 1 to 324 SEQ ID NO: 1 (noting that .5 values are rounded up). The polypeptide of item (iii) comprises, preferably at least 625 amino acids, more preferably at least 650 amino acids and most preferably at least at least 700 amino acids. Combinations of the preferred lengths and % identities are also comprised by the present invention, such as at least 90% and at least 625 amino acids, at least 92.5% and at least 650 amino acids, and at least 95% and at least 700 amino acids. The number of amino acids of the \"N-terminal portion\" is preferably up to ± 20% of, more preferably up to ± 10% of, even more preferably up to ± 5% and most preferably corresponds to the number of amino acids of the N-terminal half. The polypeptide of item (iv) above is with increasing preference at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80%, at least 90%, at least 95%, at least 98% and at least 99% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 outside the bHLH domain, the PAS1 domain and the PAS2 domain. Moreover, the polypeptide of item (iv) above is with increasing preference at least 80%, at least 85%, at least 90%, at least 92.5%, at least 95%, at least 98% and at least 99% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 inside the bHLH domain. Further, the polypeptide of item (iv) above is with increasing preference at least 60%, at least 70%, at least 80%, at least 90%, at least 95%, at least 98% and at least 99% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 inside the PAS1 domain and the PAS2 domain. It is to be understood that the present invention also encompasses any combination of the listed sequence identities (i) outside the bHLH domain, the PAS1 domain and the PAS2 domain, (ii) inside the bHLH domain, and (iii) inside the PAS1 domain and the PAS2 domain. Non-limiting examples are (i) at least 50%, (ii) at least 90%, and (iii) at least 80%; (i) at least 60%, (ii) at least 92.5%, and (iii) at least 90%; and (i) at least 80%, (ii) at least 95%, and (iii) at least 90%; and (i) at least 90%, (ii) at least 98%, and (iii) at least 95%. In accordance with the present invention, the term \"at least % identical to\" in connection with the amino acid sequences of the present invention describes the number of matches (\"hits\") of identical amino acids of two or more aligned amino acid sequences as compared to the number of amino acids making up the overall length of the amino acid sequences (or the overall compared part thereof). In other terms, using an alignment, for two or more sequences or subsequences the percentage of amino acids that are the same (e.g. at least 70% identity) may be determined, when the (sub)sequences are compared and aligned for maximum correspondence over a window of comparison, or over a designated region as measured using a sequence comparison algorithm as known in the art, or when manually aligned and visually inspected. Preferred amino acid sequences in accordance with the invention are those where the described identity exists over a region that is at least 100 to 150 amino acids in length, more preferably, over a region that is at least 200 to 400 amino acids in length. More preferred amino acid sequences in accordance with the present invention are those having the described sequence identity over the entire length of the amino acid sequences as described in the embodiments herein. Those having skill in the art will know how to determine percent sequence identity between/among sequences using, for example, algorithms such as those based on CLUSTALW computer programme ( Thompson Nucl. Acids Res. 2 (1994), 4673-4680 ) or FASTA ( Pearson and Lipman, Proc. Natl. Acad. Sci., 1988, 85; 2444 ), as known in the art. Although the FASTA algorithm typically does not consider internal non-matching deletions or additions in sequences, i.e., gaps, in its calculation, this can be corrected manually to avoid an overestimation of the % sequence identity. CLUSTALW, however, does take sequence gaps into account in its identity calculations. Also available to those having skill in this art are the BLAST and BLAST 2.0 algorithms ( Altschul, Nucl. Acids Res., 1977, 25:3389 ). For amino acid sequences, the BLASTP program uses as default a word length (W) of 3, and an expectation (E) of 10. The BLOSUM62 scoring matrix ( Henikoff, Proc. Natl. Acad. Sci., 1989, 89:10915 ) uses alignments (B) of 50, expectation (E) of 10, M=5, N=4, and a comparison of both strands. Hence, the percentage sequence identity of polypeptide sequences can be determined with programmes as the above explained programs CLUSTLAW, FASTA and BLAST. Preferably the BLAST program is used. Figures 1 to 3 show multiple sequence alignments of human NPAS4 with various orthologs from other species. Figure 1 is an alignment of human NPAS4 with various orthologs from other primates, including apes, old word monkeys, new world monkeys and a prosimian. The alignment shows that NPAS4 is almost perfectly conserved among primates. Figure 2 is an alignment of human NPAS4 with various orthologs from mammals other than primates. The human NPAS4 still shares more than about 75% sequence identity with the NPAS4 from the marsupial Tasmanian devil. Figure 3 is an alignment of human NPAS4 with various orthologs from vertebrates other than mammals, including fish and sauropsida. Despite the overall low sequence identity between human NPAS4 and the NPAS4 orthologs from selected fish and sauropsida (i.e. in the range of about 30% to about 45%), it is surprisingly demonstrated in the examples herein below that in zebrafish development human NPAS4 can rescue the zebrafish mutant cloche which mutant lacks a functional species ortholog; i.e. a functional Npas4-like. This evidences that the species orthologs despite considerable sequence differences still display the same function or essentially same function in vivo. As discussed above, human NPAS4 comprises in its N-terminal part a bHLH domain, followed by 2 PAS domains and in its C-terminal part an activation domain. This structure and these domains are evolutionary conserved in all species orthologs. Within the alignments shown in Figures 1 to 3 the location and sequences of the bHLH domain, the PAS1 domain and the PAS2 domain are indicated. The alignments also show that the N-terminal part including the functionally important bHLH domain and the two PAS domains are considerably more evolutionary conserved as compared to the C-terminal part harboring the activation domain. The exact sequence of the activation domain seems to be of no particular relevance and is believed to predominantly contribute to the folding of the NPAS4 protein. The bHLH domain, the PAS1 domain and the PAS2 domain show the highest evolutionary sequence conversation and among these domains the bHLH domain is most conserved. For example, the bHLH domain in NPAS4 of human and xenopus is 100% conserved. In accordance with item (v) a nucleic acid molecule encoding the polypeptide of any one of the above items (i) to (iv) may be employed in the method of the first and second aspect of the invention. The term \"nucleic acid molecule\", in accordance with the present invention, includes DNA, such as cDNA or genomic DNA, and RNA. It is understood that the term \"RNA\" as used herein comprises all forms of RNA including mRNA. The term \"nucleic acid molecule\" is interchangeably used in accordance with the invention with the terms \"polynucleotide\" or \"nucleic acid sequence\". The nucleic acid molecule(s) may also comprise regulatory regions or other untranslated regions. In a further embodiment, said nucleic acid molecule may comprise heterologous nucleic acid which may encode heterologous proteinaceous material thus giving rise, e.g., to fusion proteins. The present invention thus relates to a nucleic acid molecule(s) of the invention encoding a fusion protein. For example, the nucleic acid molecule of the invention can be fused in frame to a detectable marker such as purification marker or a direct or indirect fluorescence marker. Purification marker comprise one or more of the following tags: His, lacZ, GST, maltose-binding protein, NusA, BCCP, c-myc, CaM, FLAG, GFP, YFP, cherry, thioredoxin, poly(NANP), V5, Snap, HA, chitin-binding protein, Softag 1, Softag 3, Strep, or S-protein. Suitable direct or indirect fluorescence markers comprise FLAG, GFP, YFP, RFP, dTomato, cherry, Cy3, Cy5, Cy5.5, Cy7, DNP, AMCA, Biotin, Digoxigenin, Tamra, Texas Red, rhodamine, Alexa fluors, FITC, TRITC or any other fluorescent dye or hapten. Other fusion partners may encode a protein, which may increase the solubility, correct protein folding, and/or a further differentiation factor enhancing differentiation and/or maintenance of the mature endothelial cell or hematopoietic cell phenotype. In accordance with item (vi) the nucleic acid molecule of item (v) is comprised in a vector. Accordingly, the present invention also relates to a vector comprising the nucleic acid molecule(s) of the present invention. Preferably, the vector is a plasmid, cosmid, virus, bacteriophage or another vector used e.g. conventionally in genetic engineering. The nucleic acid molecule may be inserted into several commercially available vectors. The nucleic acid molecule(s) referred to above may also be inserted into vectors such that a translational fusion with another polynucleotide is generated. Examples of such fusion proteins have been described herein above. For vector modification techniques see Sambrook and Russel (2001), Molecular Cloning, Cold Spring Harbor Laboratory; 3rd editi on. Generally, vectors can contain one or more origin of replication (ori) and inheritance systems for cloning or expression, one or more markers for selection in the host and one or more expression cassettes. Suitable origins of replication (ori) include, for example, the Col E1, the SV40 viral and the M 13 origins of replication. Suitable selectable markes are, e.g. dihydrofolate reductase, G418, neomycin, ampicillin, dhfr, gpt, hygromycin, or kanamycin. The coding sequences inserted in the vector can e.g. be synthesized by standard methods, or isolated from natural sources. Ligation of the coding sequences to transcriptional regulatory elements and/or to other amino acid encoding sequences can be carried out using established methods. Transcriptional regulatory elements (parts of an expression cassette) ensuring expression in prokaryotes or eukaryotic cells are well known to those skilled in the art. These elements comprise regulatory sequences ensuring the initiation of transcription (e.g., promoters, such as naturally-associated or heterologous promoters and/or insulators), internal ribosomal entry sites (IRES) ( Owens, Proc. Natl. Acad. Sci. USA 98 (2001), 1471-1476 ) and optionally poly-A signals ensuring termination of transcription and stabilization of the transcript. Additional regulatory elements may include transcriptional as well as translational enhancers. Highly efficient transcription can be achieved with the early and late promoters from SV40, the long terminal repeats (LTRs) from retroviruses, e.g., RSV, HTLVI, HIVI, and the early promoter of the cytomegalovirus (CMV). In accordance with a preferred embodiment of the method of the invention the nucleic acid sequences encode the nucleic acid molecule of the invention in an expressible form, such as an inducible expressible form. Accordingly, also the vector of the invention is preferably an expression vector. An expression vector according to this invention is capable of directing the replication, and the expression, of the polynucleotide and encoded differentiation factor(s) of this invention. Suitable expression vectors, which comprise the described regulatory elements are known in the art. The vector of the invention may be a mammalian expression vector. A typical mammalian expression vector contains the promoter element, which mediates the initiation of transcription of mRNA, the protein coding sequence, and signals required for the termination of transcription and polyadenylation of the transcript and moreover, elements such as origin of replication, drug resistance gene, regulators (as part of an inducible promoter) may also be included. The nucleic acid molecules as described herein above may be designed for direct introduction into a cell, or introduction via phage vectors or viral vectors (e.g. adenoviral, retroviral) into a cell. Systems for inducible expression are widely used in the state of the art and include but are not limited to the Tet-on system, Tet-off system, lac operator/expressor system and the commercial systems Q-mate™, Rheo Swith®, Cumate® or TREX™. As known in the art, inducible expression systems allow one to control the expression of a gene over time, the order of the genes expressed (provided that different expression systems, e.g. a Tet-on system and Tet-off system are used in parallel or subsequently for the expression of different genes) and also the amount of expressed mRNA from the vector. In an even more preferred embodiment of the method of the invention the one or more vector(s) are one or more lentiviral vector(s).Examples of lentiviruses providing elements of a lentiviral vector are HIV, SIV, FIV, Puma lentivirus, EIA, ·Bovine immunodeficiency virus, Caprine arthritis encephalitis virus, or Visna/maedi virus. Preferably used in accordance with the invention is a 3 rd generation lentiviral expression plasmid containing a SFFV promoter driven IRES-Puro (Foxa2), IRES-dTomato (C/EBPα) or IRES-eGFP (HNF4α) expression cassette. Lentiviruses are particularly useful in the method for the invention because they integrate into the genome and thus allow for non-transient gene expression. Moreover, studies have shown that lentivirus vectors have a lower tendency to integrate in places that potentially cause cancer than gamma-retroviral vectors which also integrate into the genome ( Cattoglio et al. (2007), Blood, 110(6):1770-1778 ). Thus they have a lower tendency of abnormal cell growth upon integration. In a third aspect the present invention pertains to a method for producing cardiomyocytes from progenitor cells, said method comprising inhibiting NPAS4 function in the progenitor cells. The definitions of terms, preferred embodiments and practical guidance provided herein above with regard to the first and second aspect of the invention apply mutatis mutandis to the third aspect of the invention. Accordingly, in connection with the third aspect of the invention the progenitor cells have the capacity of differentiating into cardiomyocytes. Cardiomyocytes are the muscle cells of the heart. Cardiomyocytes make up the atria (i.e. the chambers in which blood enters the heart) and the ventricles (i.e. the chambers where blood is collected and pumped out of the heart). Just as endothelial cells and hematopoietic cells, cardiomyocytes are of mesodermal origin. For the reasons discussed herein above, in connection with the present invention the term \"cardiomyocyte\" refers to cells having essentially a mature cardiomyocyte phenotype which can in vitro and/or in vivo substitute the functions of in vivo differentiated cardiomyocytes. The term \"inhibiting NPAS4 function\" designates the inhibition of the transcription factor activity of NPAS4 or a species ortholog thereof. The inhibition of the transcription factor activity of NPAS4 or a species ortholog thereof is preferably determined by measuring the inhibition of the expression of the gene encoding NPAS4 or a species ortholog thereof and/or of the downstream effector genes tal1 and/or etv2. In this respect, inhibiting NPAS4 function requires with increasing preference that the expression of the gene(s) is diminished by at least 70%, at least 80%, at least 90%, and at least 95% in the presence of the factor(s) inhibiting NPAS4 function as compared to corresponding conditions in the absence of the factor(s) inhibiting NPAS4 function. Most preferably the expression of the gene(s) is completely abolished (i.e. is no longer detectable). It is to be understood that also in the above-described method of the third aspect of the invention in general one or more differentiation factors may be used. At least one differentiation factor is capable of inhibiting NPAS4 function. In accordance with the third aspect of the invention the additional transcription factor(s) contribute to producing cardiomyocytes from progenitor cells. Various differentiation factors for obtaining cardiomyocytes are known in the art. For example, cardiomyocytes may be obtained by sequentially treating progenitor cells with activin A and BMP4 in a serum-free and insulin-free medium and then maintained in a serum-free medium with insulin ( Jha et al. (2015), Methods Mol Biol;1299:115-31 ). As another example, a Gsk3 inhibitor may used in combination with a β-catenin inhibitor or a chemical Wnt inhibitor ( Lia et. (2013), Nat Protoc.; 8(1):162-175 ). Also Fgf-signaling and in particular Fgf8 may be employed for obtaining cardiomyocytes. Accordingly the one or more additional differentiation factors are in connection with the third aspect of the invention preferably selected from a member of the Fgf-family (preferably Fgf8), activin A, BMP4, Gsk3 inhibitors, β-catenin inhibitors and a chemical Wnt inhibitor. As demonstrated by the examples herein below Npas4-like was found by the present inventors to be essential for the formation of endothelial cells and hematopoietic cells in zebrafish. As mentioned, endothelial cells and hematopoietic cells are built from common progenitor cells called hemangioblasts. In contrast to mesodermal progenitor cells, hemangioblasts are no longer capable of differentiating into cardiomyocytes. The work of Schoenebeck et al. (2007), Dev Cell, 13:254-267 shows that expression of the putative cloche gene - which gene has only been identified as being Npas4-like in accordance with the present invention - and its downstream effectors tal1 and etv2 ensures that the mesoderm differentiates into endothelial cell and hematopoietic cells. On the other hand, the expression of hand2 ensures that the mesoderm differentiates into cardiomyocytes in zebrafish. It was found that the repression of myocardial specification by vascular and hematopoietic pathway coordinates the development of the cardiovascular system. It was furthermore found that the loss of cloche function causes an expansion of cardiogenic markers within the lateral plate mesoderm. For these reasons it can be assumed that inhibiting NPAS4 function in progenitor cells promotes their differentiation into cardiomyocytes. In accordance with a preferred embodiment, also the method of the third aspect of the invention further comprises isolating the cardiomyocytes. In the above-described methods of the third aspect of invention not each progenitor cell may be transformed into a cardiomyocyte for essentially the same reason discussed herein above in connection with endothelial cells and hematopoietic cells. Methods for isolating cells are well known in the state of the art and have been discussed in further detail herein above. Cardiomyocyte cell-surface markers include but are not limited to SIRPA, Cx43, and Desmin. Connexin 43 (Cx43) is the main constituent of cardiomyocyte gap junctions. Desmin is the major muscle-specific intermediate filament protein. SIRPA is a receptor-type transmembrane glycoprotein specifically expressed on cardiomyocytes. In accordance with a further preferred embodiment of the third aspect of the invention the progenitor cells are embryonic stem cells (ESCs), induced pluripotent stem cells (iPSs), mesodermal progenitor cells, cardiomyocyte progenitor cells, or a mixture thereof. Cardiomyocyte progenitor cells are capable of generating phenotypically and functionally competent cardiomyocytes. Cardiomyocyte progenitor cells can be isolated, for example, from cardiac surgical waste or alternatively from fetal heart tissue ( Smits el al. (2009), Nat Protoc, 4(2):232-243 ). In accordance with a different preferred embodiment of the third aspect of the invention the NPAS4 function is inhibited by (a) a dominant negative mutant of NPAS4 or a species ortholog thereof or a nucleic acid molecule encoding the same; (b) an aptamer, a ribozyme, an antibody, a protein drug, or a small molecule inhibitor against NPAS-4 or a species ortholog thereof; and/or (c) a siRNA, a shRNA, a morpholino, a microRNA or an antisense nucleic acid specifically interacting with a nucleic acid molecule encoding NPAS-4 or a species ortholog thereof. Methods for introducing compounds into a cell have been discussed herein above and may also be used in connection with the third aspect of the invention. A dominant negative mutant of NPAS4 or a species ortholog thereof is characterized by having one or more amino acid mutation(s) which mutation(s) result in a mutant NPAS4 or a species ortholog thereof that can interfere with the function of the normal (i.e. unmutated wild-type) NPAS4 or a species ortholog thereof. Aptamers are DNA or RNA molecules that bind other molecules, such as nucleic acids, proteins, small organic compounds, and even entire organisms. A database of aptamers is maintained at http://aptamer.icmb.utexas.edu/. More specifically, aptamers can be classified as DNA or RNA aptamers or peptide aptamers. Whereas the former consist of (usually short) strands of oligonucleotides, the latter consist of a short variable peptide domain, attached at both ends to a protein scaffold. Nucleic acid aptamers are nucleic acid species that have been engineered through repeated rounds of in vitro selection or equivalently, SELEX (systematic evolution of ligands by exponential enrichment) to bind to various molecular targets such as small molecules, proteins, nucleic acids, and even cells, tissues and organisms. Peptide aptamers are proteins that are designed to interfere with other protein interactions inside cells. They consist of a variable peptide loop attached at both ends to a protein scaffold. This double structural constraint greatly increases the binding affinity of the peptide aptamer to levels comparable to an antibody's (nanomolar range). The variable loop length is typically comprised of 10 to 20 amino acids, and the scaffold may be any protein which has good solubility properties. Currently, the bacterial protein Thioredoxin-A is the most used scaffold protein, the variable loop being inserted within the reducing active site, which is a -Cys-Gly-Pro-Cys- loop in the wild-type protein, the two cysteine side chains being able to form a disulfide bridge. Peptide aptamer selection can be made using different systems, but the most used is currently the yeast two-hybrid system. Aptamers offer the utility for biotechnological and therapeutic applications as they offer molecular recognition properties that rival those of the commonly used biomolecules, in particular antibodies. In addition to their discriminate recognition, aptamers offer advantages over antibodies as they can be engineered completely in a test tube, are readily produced by chemical synthesis, possess desirable storage properties, and elicit little or no immunogenicity in therapeutic applications. Non-modified aptamers are cleared rapidly from the bloodstream, with a half-life of minutes to hours, mainly due to nuclease degradation and clearance from the body by the kidneys, a result of the aptamer's inherently low molecular weight. Unmodified aptamer applications currently focus on treating transient conditions such as blood clotting, or treating organs such as the eye where local delivery is possible. This rapid clearance can be an advantage in applications such as in vivo diagnostic imaging. Several modifications, such as 2'-fluorine-substituted pyrimidines, polyethylene glycol (PEG) linkage, fusion to albumin or other half-life extending proteins etc. are available to scientists with which the half-life of aptamers may be extended. The aptamers of the present invention may also comprise or be composed of L-ribonucleic acids in which case they may be designated spiegelmers The term \"ribozymes\" refers to RNA molecules that act as enzymes in the absence of proteins. These RNA molecules act catalytic or autocatalytic and are capable of cleaving e.g. other RNAs at specific target sites but they have also been found to catalyze the aminotransferase activity of the ribosome. Selection of appropriate target sites and corresponding ribozymes are known in the art. Examples of well-characterized small self-cleaving RNAs are the hammerhead, hairpin, hepatitis delta virus, and in vitro -selected lead-dependent ribozymes. The organization of these small catalysts is in contrast to that of larger ribozymes, such as the group I intron. The principle of catalytic self-cleavage has become well established in the last decades. The hammerhead ribozymes are characterized best among the RNA molecules with ribozyme activity. Since it was shown that hammerhead structures can be integrated into heterologous RNA sequences and that ribozyme activity can thereby be transferred to these molecules, it appears that catalytic antisense sequences for almost any target sequence can be created, provided the target sequence contains a potential matching cleavage site. The basic principle of constructing hammerhead ribozymes is as follows: An interesting region of the RNA, which contains the GUC (or CUC) triplet, is selected. Two oligonucleotide strands, each with 6 to 8 nucleotides, are taken and the catalytic hammerhead sequence is inserted between them. Molecules of this type were synthesized for numerous target sequences. They showed catalytic activity in vitro and in some cases also in vivo. The best results are usually obtained with short ribozymes and target sequences. The term \"antibody\" as used in accordance with the present invention comprises, for example, polyclonal or monoclonal antibodies. Furthermore, also derivatives or fragments thereof, which still retain the binding specificity, are comprised in the term \"antibody\". Antibody fragments or derivatives comprise, inter alia, Fab or Fab' fragments, Fd, F(ab') 2 , Fv or scFv fragments, single domain V H or V-like domains, such as VhH or V-NAR-domains, as well as multimeric formats such as minibodies, diabodies, tribodies, tetrabodies or chemically conjugated Fab'-multimers. The term \"antibody\" also includes embodiments such as chimeric (human constant domain, non-human variable domain), single chain and humanized (human antibody with the exception of non-human CDRs) antibodies. Various techniques for the production of antibodies and fragments thereof are well known in the art and described, e.g. in Altshuler et al., 2010, ISSN 0006-2979, Biochemistry (Moscow), 2010, Vol. 75, No. 13, pp. 1584-1605 . Thus, polyclonal antibodies can be obtained from the blood of an animal following immunisation with an antigen in mixture with additives and adjuvans and monoclonal antibodies can be produced by any technique, which provides antibodies produced by continuous cell line cultures. Furthermore, recombinant antibodies may be obtained from monoclonal antibodies or can be prepared de novo using various display methods such as phage, ribosomal, mRNA, or cell display. A suitable system for the expression of the recombinant (humanized) antibodies or fragments thereof may be selected from, for example, bacteria, yeast, insects, mammalian cell lines or transgenic animals or plants (see, e.g., US patent 6,080,560 ). Further, techniques described for the production of single chain antibodies (see, inter alia, US Patent 4,946,778 ) can be adapted to produce single chain antibodies specific for the target of this invention. Surface plasmon resonance as employed in the BIAcore system can be used to increase the efficiency of phage antibodies. In the art a variety of protein drugs are available, which all have been designed by using wild-type proteins as scaffolds (for review, Tomlinson et al. (2004), Nature Biotechnology 22:521-522 ). Non-limiting examples of such protein drugs are small molecule inhibitors, which have been developed using transferrin, C-type lectins, trinectins, domain antibodies, kunitz domains, lipocalins, ankyrin repeats or the Fyn SH3 domain as protein scaffold. As detailed in Tomlinson et al. (2004), loc lit, once the suitability of a protein scaffold for the generation protein drugs is known, the protein scaffold can in principle be used to generate protein drugs to any desired target which target is in accordance with the present invention NPAS4 or a species ortholog thereof. A small molecule inhibitor designates a low molecular weight (generally below 900 Daltons and preferably below 500 Daltons) organic compound that is in accordance with the present invention capable of inhibiting NPAS4 function. In the art several small molecule inhibitor libraries are available which can be screened by high-throughput techniques for a small molecule inhibitor having the desired function, being in accordance with the present invention the inhibition of NPAS4 or a species ortholog thereof. High-throughput screening (HTS) has become a routine method for identifying small molecule inhibitor ( Inglese et al (2007), Nature Chemical Biology, 3:438-441 ). The terms \"antisense nucleic acid molecule\", \"small interfering RNAs (siRNAs)\", \"short hairpin RNAs (shRNAs)\", \"morpholinos\" and \"microRNAs (miRNAs)\", as used herein, are known in the art and are defined in accordance with the pertinent art. Accordingly, an antisense nucleic acid molecule is a nucleic acid which is complementary to, and capable of hybridising with, the target nucleic acid. Due to the formation of the hybrid, transcription of the target gene(s) and/or translation of the target mRNA is reduced or blocked. Standard methods relating to antisense technology have been described (see, e.g., Melani et al., Cancer Res. (1991) 51:2897-2901 ). \"Small interfering RNA (siRNA)\", also known as short interfering RNA or silencing RNA, refers to a class of 18 to 30, preferably 19 to 25, most preferred 21 to 23 or even more preferably 21 nucleotide-long doublestranded RNA molecules capable of interfering with the expression of a target gene. Naturally occurring siRNAs have a well defined structure: a short double-strand of RNA (dsRNA) with 2-nt 3' overhangs on either end. Each strand has a 5' phosphate group and a 3' hydroxyl (-OH) group. siRNAs can also be exogenously (artificially) introduced into cells to bring about the specific knockdown of a target gene. Essentially any gene of which the sequence is known can be targeted based on sequence complementarity with an appropriately tailored siRNA. Exogenously introduced siRNAs may be devoid of overhangs at their 3' and 5' ends, however, it is preferred that at least one RNA strand has a 5'- and/or 3'-overhang. Preferably, one end of the double-strand has a 3'-overhang from 1-5 nucleotides, more preferably from 1-3 nucleotides and most preferably 2 nucleotides. The other end may be blunt-ended or has up to 6 nucleotides 3'-overhang. Most preferably, the siRNA is a duplexes composed of 21-nt sense and 21-nt antisense strands, paired in a manner to have 2-nt 3' overhangs on either end. The sequence of the 2-nt 3' overhang makes a small contribution to the specificity of target recognition restricted to the unpaired nucleotide adjacent to the first base pair. 2'-deoxynucleotides in the 3' overhangs are as efficient as ribonucleotides, but are often cheaper to synthesize and probably more nuclease resistant. A \"short hairpin RNA (shRNA)\" is a sequence of RNA that makes a tight hairpin turn that can be used to silence gene expression via RNA interference. shRNA can for example use a vector introduced into cells, in which case preferably the U6 promoter is utilized to ensure that the shRNA is always expressed. This vector is usually passed on to daughter cells, allowing the gene silencing to be inherited. The shRNA hairpin structure is cleaved by the cellular machinery into siRNA, which is then bound to the RNA-induced silencing complex (RISC). This complex binds to and cleaves mRNAs that match the siRNA that is bound to it. A \"morpholino\" (also known as a morpholino oligomer and as a phosphorodiamidate morpholino oligomer (PMO)), is a type of oligomer molecule (colloquially, an oligo) used in the art to modify gene expression. The molecular structure has a backbone of methylenemorpholine rings and phosphorodiamidate linkages. Morpholinos block access of other molecules to small (-25 base) specific sequences of the base-pairing surfaces of ribonucleic acid (RNA). Morpholinos are used in the art, for example, for reverse genetics by knocking down gene function. The examples herein below exemplify morpholinos against npas4-like (i.e. SEQ ID NOs 33 and 34). These morpholinos against npas4-like are preferred examples of morpholinos against npas4-like. A \"microRNA (miRNA)\" is a single-stranded RNA molecule that, as an endogenous RNA molecule, regulates gene expression. Binding to a complementary mRNA transcript triggers the degradation of said mRNA transcript through a process similar to RNA interference. Accordingly, miRNA may be employed as an inhibitor of NPAS4 function in accordance with the present invention. The above-described aptamer, ribozyme, antibody, protein drug, small molecule inhibitor against NPAS-4 or a species ortholog thereof; and siRNA, shRNA, morpholino, or antisense nucleic acid against a nucleic acid molecule encoding NPAS-4 or a species ortholog thereof are all preferably specific for NPAS-4 and/or a respective species ortholog thereof. This means that all these compounds are capable of specifically inhibiting NPAS4 function and do not or essentially do not exert any off target inhibitory effects. In accordance with a preferred embodiment of the first, second and third aspect of the invention, the method is an ex vivo or in vitro method. The term \"ex vivo\" means that the method of the invention is performed outside an organism. \"Ex vivo\" thus refers to a method carried out on progenitor cells in an external environment, preferably with the minimum alterations of natural conditions. The term \"in vitro\" means that the method is performed with isolated progenitor cells that have obtained from an organism, preferably a mammal. In a fourth aspect the present invention relates to a cell produced by the method of the first, second or third aspect of the invention. As is evident from the above, the cell is in accordance with the first aspect of the invention an endothelial cell, in accordance with the second aspect of the invention a hematopoietic cell, and in accordance with the third aspect of the invention a cardiomyocyte. As also discussed herein above, the endothelial cell, hematopoietic cell, and cardiomyocyte of the invention on the one hand essentially display the cellular function and essentially have the mature phenotype of an endothelial cell, hematopoietic cell, and cardiomyocyte, respectively, but on the other hand are in general not 100% identical to the corresponding in vivo differentiated cell-type. For this reason it can be assumed that the cells established by the methods of the present invention are unique and not availabe from the prior art. In a fifth aspect the present invention relates to a nucleic acid molecule encoding a transcription factor having Npas4-like function, wherein the nucleic acid molecule is selected from the group consisting of (i) a nucleic acid molecule encoding the amino acid sequence of SEQ ID NO: 25; (ii) a nucleic acid molecule comprising or consisting of SEQ ID NO: 32; (iii) a nucleic acid molecule encoding an amino acid sequence being at least 70% identical to SEQ ID NO: 25; (iv) a nucleic acid molecule encoding an amino acid sequence comprising at least 600 amino acids, wherein the N-terminal portion of said polypeptide is at least 80% identical to the N-terminal half of the amino acid sequence of SEQ ID NO: 32; (v) a nucleic acid molecule encoding an amino acid sequence being at least 60% identical to the amino acid sequence of SEQ ID NO: 25 outside the bHLH domain, the PAS1 domain and the PAS2 domain, being at least 90% identical to the amino acid sequence of SEQ ID NO: 25 inside the bHLH domain, and being at least 80% identical to the amino acid sequence of SEQ ID NO: 25 inside the PAS1 domain and the PAS2 domain; or (vi) a vector comprising the nucleic acid molecule of any one of (i) to (v). The term \"a transcription factor having Npas4-like function\" means that the transcription factor is capable of the induction of the expression of the gene tal1 and/or the gene etv2, preferably of tal1 and/or etv2 from zebrafish. The examples herein below demonstrate that tal1 and etv2 are downstream of Npas4-like and that in the absence of Npas4-like no tal1 and etv2 expression is observed. As mentioned, the amino acid sequence of SEQ ID NO: 25 as recited in item (i) is the amino acid sequence of the Npas4-like protein from zebrafish. The nucleotide sequence of SEQ ID NO: 32 as recited in item (ii) is the nucleotide sequence of the gene encoding the Npas4-like protein from zebrafish. The complete cDNA sequence of the Npas4-like gene including the start codon, stop codon and untranslated regions is shown in SEQ ID NO: 33. The amino acid sequence of item (iii) above is with increasing preference at least 75%, at least 80%, at least 85%, at least 90%, at least 92.5%, at least 95%, at least 98% and at least 99% identical to the amino acid sequence of SEQ ID NO: 25. The amino acid sequence of item (iv) above is with increasing preference at least 85%, at least 90%, at least 92.5%, at least 95%, at least 98% and at least 99% identical to the N-terminal half of amino acid sequence of SEQ ID NO: 25. Again, the term \"N-terminal half\" means the first 50% of the entire amino acid sequence of SEQ ID NO: 25. SEQ ID NO: 25 comprises 647 amino acids and the \"N-terminal half\" consequently consists of amino acids 1 to 324 SEQ ID NO: 1 (noting that .5 values get rounded up). The polypeptide of item (iii) comprises, preferably at least 625 amino acids, more preferably at least 640 amino acids and most preferably at least 645 amino acids. Combinations of the preferred lengths and % identities are also comprised by the present invention, such as at least 92.5% and at least 625 amino acids, at least 95% and at least 640 amino acids, and at least 98% ,and at least 645 amino acids. The number of amino acids of the \"N-terminal portion\" is preferably up to ± 20% of, more preferably up to ± 10% of, even more preferably up to ± 5% and most preferably corresponds to the number of amino acids of the N-terminal half. The amino acid sequence of item (v) above is with increasing preference at least 70%, at least 80%, at least 90%, at least 95%, at least 98% and at least 99% identical to an amino acid sequence of SEQ ID NO: 25 outside the bHLH domain, the PAS1 domain and the PAS2 domain. Moreover, the polypeptide of item (iv) above is with increasing preference at least 92.5%, at least 95%, at least 98% and at least 99% identical to an amino acid sequence of SEQ ID NO: 25 inside the bHLH domain. Further, the polypeptide of item (iv) above is with increasing preference at least 85%, at least 90%, at least 95%, at least 98% and at least 99% identical to an amino acid sequence of SEQ ID NO: 25 inside the PAS1 domain and the PAS2 domain. It is to be understood that the present invention also encompasses any combination of the listed sequence identities (i) outside the bHLH domain, the PAS1 domain and the PAS2 domain, (ii) inside the bHLH domain, and (iii) inside the PAS1 domain and the PAS2 domain. Non-limiting examples are (i) at least 70%, (ii) at least 92.5%, and (iii) at least 85%; (i) at least 80%, (ii) at least 95%, and (iii) at least 90%; and (i) at least 85%, (ii) at least 98%, and (iii) at least 95%; and (i) at least 90%, (ii) at least 99%, and (iii) at least 98%. Suitable vectors as recited in item (vi) which may comprise the nucleic acid molecule of any one of the above items (i) to (v) are discussed herein above in connection with the first and second aspect of the invention. The examples of the present invention were conducted using the zebrafish cloche mutant. The zebrafish cloche mutant with effects in both the endothelial and hematopoietic lineages at a very early embryonic stage has already been known for over 20 years (Stainier et al., 1995, loc. lit.). Due to the unique phenotype displayed by cloche mutants, both the mutant and the genomic cloche locus have been the subject of intense investigation since then ( Liao et al., 1997, Development 124, 381-389 ; Liao et al., 1998, Genes Dev 12, 621-626 ; Sumanas et al., 2005, Blood 106, 534-541 ; Schoenebeck et al., 2007, Dev Cell 13, 254-67 ; Nissim et al., 2014, Dev Cell 28, 423-437 ; Fortuna et al., 2015, Cell Rep 11, 1786-1796 ; Rasmussen et al., 2015, J Neurosci 35, 559-570 ). The cloche locus was mapped to one of the telomeres of chromosome 13 ( Liao et al., 2000, Development 127, 4303-13 ). However, all of the numerous attempts of isolating the putative cloche gene have failed within the last 20 years. For example, the recent publication Leshchiner et al. (2012), Genome Res; 22(8):1541-1548 reports on the further resolution of the mutation region harbouring the putative cloche gene but evidently failed to isolate and sequence the gene. The reason for the various failures to isolate the cloche gene is the above-discussed telomeric location of the cloche locus along with the lack of a reliable genome assembly at chromosome ends. Genome assembly at chromosome ends is particularly difficult due to the presence of telomeres. Telomeres have an unusual DNA sequence composition and organization that makes them particularly difficult to isolate and analyse. Telomers can be found in majority of organisms, as diverse as protozoan, fungi, fish, mammals and plants. All vertebrates have specific telomeric repeat sequence. Telomers are generally highly repetitive loci that show GT or AC repeats in intergenic or intronic sequences. The inventors of the present invention finally and surprisingly succeeded in cloning and sequencing the putative cloche gene, being termed herein npas4-like (or npas4I) based on its human ortholog NPAS4. The approach taken by the inventors which finally resulted in the identification of the transcription factor Npas4-like required the design of a cascade of several inventive and laborious approaches. In order to provide higher genetic resolution to the cloche region and narrow down the critical interval that contains the cloche mutation, the inventors initially genotyped in addition to the 2359 known cloche mutant embryos 5561 further cloche mutant embryos for a total of 7920 which allowed them to identify more zero recombinant markers as well as very tightly linked flanking markers (see Fig. 4B ). Searching the available genomic databases led to the identification of several genes in the cloche locus including lclat (aka lycat ) ( Xiong et al., 2008, Circulation Research; 102:1057-1064 ), lbh, klhdc3, and inpp5a. The inventors sequenced these genes looking for severe molecular lesions and also carried out functional studies including morpholino knockdowns and mRNA rescues, but again failed to isolate the putative cloche gene. The inventors hypothesized on the basis of these initial failures that the physical genomic assembly of the cloche region may not match any available genetic map of the zebrafish genome and that consequently additional yet unknown genes may be located in the cloche region. In order to test this hypothesis and to identify these missing genes, (i) the deletion allele of cloche m39 (clo m39 ) and (ii) the prior art knowledge that the gene expression profile of endothelial and hematopoietic cells in early embryogenesis includes etv2 and tal1 were employed. Extensive bioinformatics analysis of about 40 million sequence reads then led to the identification of several new candidate genes as well as previously identified genes in the cloche region ( Fig. 1F ). Each of these novel candidate genes was then mutated and a total of 17 individual zebrafish mutants were tested. Only one out of these 17 mutants, namely the npas4-like mutant was not able to complement the clo m39 allele, and showed a vascular phenotype ( Fig. 4G ). Confirming the hypothesis of the inventors, the npas4-like gene did not map to the physical assembly of the cloche region but to a small unassigned scaffold (KN150101.1, Fig. 4C ). Further, inventive efforts were required in order to obtain the full-length npas4-like sequence. Initially it was only possible to identify a sequence translating into a continuous reading frame of 293 amino acids that showed an identity of 33% over a length of 113 amino acids to the C-terminal region of Npas4 from Cynoglossus semilaevis. The inventors finally succeeded to assemble the full-length Npas4-like protein of 647 amino acids (SEQ ID NO: 25) by RACE of the 5' end of the cDNA and RACE to the 3' end of the cDNA. In a sixth aspect the present invention relates to a host cell comprising the nucleic acid molecule of the fifth aspect of the invention. In a preferred embodiment, the host cell is a progenitor cell as defined herein above, more preferably in connection with the first and second aspect of the invention. Such a host cell may be employed in the method of the first and second aspect of the invention. In another preferred embodiment, the host cell is as an isolated cell which may be part of a cell culture. Such a host cell may be used for recombinantly producing the nucleic acid molecule of the fifth aspect of the invention, as will be further detailed herein below. Suitable prokaryotic host cells comprise e.g. bacteria of the species Escherichia, Bacillus, Streptomyces and Salmonella typhimurium. Suitable eukaryotic host cells are e.g. fungal cells, inter alia, yeasts such as Saccharomyces cerevisiae or Pichia pastoris or insect cells such as Drosophila S2 and Spodoptera Sf9 cells and plant cells as well as mammalian cells. Appropriate culture media and conditions for the above-described host cells are known in the art. Mammalian host cells that could be used include, human Hela, HEK293, H9 and Jurkat cells, mouse NIH3T3 and C127 cells, Cos 1, Cos 7 and CV1, quail QC1-3 cells, mouse L cells and Chinese hamster ovary (CHO) cells. Also within the scope of the present invention are primary mammalian cells such as mouse embryonic fibroblasts (MEF). Alternatively, the nucleic acid molecule of the fifth aspect of the invention can be expressed in stable cell lines that contain a gene construct with said nucleic acid molecule integrated into a chromosome. In a more preferred embodiment, said cell is a primary cell or primary cell line. Primary cells are cells which are directly obtained from an organism. Suitable primary cells are in particular the progenitor cells discussed herein above, in connection with the first, second and third aspect of the invention. In a seventh aspect the present invention relates to a method for producing a transcription factor having Npas4-like function comprising (a) culturing the host cell of the sixth aspect the invention, and (b) recovering the polypeptide encoded by the nucleic acid molecule of the fifth aspect of the invention. As discussed, Npas4-like is the zebrafish ortholog of human NPAS4. For this reason a transcription factor having Npas4-like is a particular example of the above-discussed transcription factor having the function of an ortholog of human NPAS4. Therefore the transcription factor having Npas4-like function produced by the method of the seventh aspect of the invention is preferably employed in the methods of the first and second aspect of the invention as the transcription factor having the function of an ortholog of human NPAS4. It is furthermore to be understood that said polypeptide may comprise additional N- or C-terminal amino acid sequences. Such polypeptides are sometimes also referred to as fusion proteins. Particular examples of fusion partners have been discussed above. A large number of suitable methods exist in the art to produce polypeptides (or fusion proteins) in appropriate hosts. If the host is a unicellular organism one can revert to a variety of available culture conditions. Conveniently, the produced protein is harvested from the culture medium, lysates of the cultured organisms or from isolated (biological) membranes by established techniques. In the case the host is a cell which is part of or derived from a part of the organism, for example said host cell may be the harvestable part of an organ or tissue. A preferred method involves the recombinant production of protein in hosts. For example, nucleic acid sequences comprising the polynucleotide according to the invention can be synthesized by PCR, inserted into an expression vector. Subsequently a suitable host may be transformed with the expression vector. Thereafter, the host is cultured to produce the desired polypeptide(s), which is/are isolated and purified. Protein isolation and purification for recovering the polypeptide can be achieved by any one of several known techniques; for example and without limitation, ion exchange chromatography, gel filtration chromatography and affinity chromatography, high pressure liquid chromatography (HPLC), reversed phase HPLC, and preparative disc gel electrophoresis. Protein isolation/purification techniques may require modification of the proteins of the present invention using conventional methods. For example, in case a histidine tag is added to the protein as purification tag a nickel column may be used. Further possible modifications for purification have been discussed herein above in connection with the vector of the invention. An alternative method for producing the polypeptide of the invention is in vitro translation of mRNA. Suitable cell-free expression systems for use in accordance with the present invention include rabbit reticulocyte lysate, wheat germ extract, canine pancreatic microsomal membranes, E. coli S30 extract, and coupled transcription/translation systems such as the TNT-system (Promega). These systems allow the expression of recombinant polypeptides upon the addition of cloning vectors, DNA fragments, or RNA sequences containing coding regions and appropriate promoter elements. In addition to recombinant production, the polypeptide of the invention may be produced synthetically, e.g. by direct peptide synthesis using solid-phase techniques ( Stewart et al. (1969) Solid Phase Peptide Synthesis; Freeman Co, San Francisco ; Merrifield, J. Am. Chem. Soc. 85 (1963), 2149-2154 ). Synthetic protein synthesis may be performed using manual techniques or by automation. Automated synthesis may be achieved, for example, using the Applied Biosystems 431A Peptide Synthesizer (Perkin Elmer, Foster City CA) in accordance with the instructions provided by the manufacturer. Various fragments may be chemically synthesized separately and combined using chemical methods to produce the full-length molecule. As indicated above, chemical synthesis, such as the solid phase procedure described by Houghton Proc. Natl. Acad. Sci. USA (82) (1985), 5131-5135 , can be used. Furthermore, the polypeptide (protein), fragments of the protein or the fusion protein of the invention may be produced semi-synthetically, for example by a combination of recombinant and synthetic production. In a eighth aspect the present invention relates to a polypeptide encoded by the nucleic acid molecule of the fifth aspect of the invention or produced by the method of the seventh aspect of the invention. It is to be understood that said polypeptide of the eighth aspect of the invention comprises or is a transcription factor having Npas4-like function as defined herein above. As discussed, Npas4-like is the zebrafish ortholog of human NPAS4. For this reason the definition of the term \"polypeptide\" provided herein above in connection with the orthologs of human NPAS4 which may be used in the methods of the first and second aspect of the invention also applies to the polypeptide of the eighth aspect of the invention. It also has to be understood that the polypeptide of the eighth aspect of the invention is preferably employed in the methods of the first and second aspect of the invention. In a ninth aspect the present invention relates to a pharmaceutical composition comprising (i) the polypeptide and/or the nucleic acid molecule as defined in connection with the first and second aspect of the invention; or the polypeptide, the nucleic acid molecule, and/or the vector as defined in connection with the first and second aspect of the invention; and/or (ii) the cell of the fourth aspect of the invention, the nucleic acid molecule of the fifth aspect of the invention, the host cell of the sixth aspect of the invention, the polypeptide of the eighth aspect of the invention, or a combination thereof. In accordance with the present invention, the term \"pharmaceutical composition\" relates to a composition for administration to a patient, preferably a human patient. The pharmaceutical composition of the invention comprises the compounds recited above. It may, optionally, comprise further molecules capable of altering the characteristics of the compounds of the invention thereby, for example, stabilizing, modulating and/or activating their function. The composition may be in solid, liquid or gaseous form and may be, inter alia, in the form of (a) powder(s), (a) tablet(s), (a) solution(s) or (an) aerosol(s). The pharmaceutical composition of the present invention may, optionally and additionally, comprise a pharmaceutically acceptable carrier. Examples of suitable pharmaceutical carriers are well known in the art and include phosphate buffered saline solutions, water, emulsions, such as oil/water emulsions, various types of wetting agents, sterile solutions, organic solvents including DMSO etc. Compositions comprising such carriers can be formulated by well known conventional methods. These pharmaceutical compositions can be administered to the subject at a suitable dose. The dosage regimen will be determined by the attending physician and clinical factors. As is well known in the medical arts, dosages for any one patient depends upon many factors, including the patient's size, body surface area, age, the particular compound to be administered, sex, time and route of administration, general health, and other drugs being administered concurrently. The therapeutically effective amount for a given situation will readily be determined by routine experimentation and is within the skills and judgement of the ordinary clinician or physician. Generally, the regimen as a regular administration of the pharmaceutical composition should be in the range of 1 µg to 5 g units per day. However, a more preferred dosage might be in the range of 0.01 mg to 100 mg, even more preferably 0.01 mg to 50 mg and most preferably 0.01 mg to 10 mg per day. \nFurthermore, if for example said compound is an polypeptide or nucleic acid molecule the total pharmaceutically effective amount of pharmaceutical composition administered will typically be less than about 75 mg per kg of body weight, such as for example less than about 70, 60, 50, 40, 30, 20, 10, 5, 2, 1, 0.5, 0.1, 0.05, 0.01, 0.005, 0.001, or 0.0005 mg per kg of body weight. More preferably, the amount will be less than 2000 nmol of polypeptide or nucleic acid molecule (per kg of body weight, such as for example less than 1500, 750, 300, 150, 75, 15, 7.5, 1.5, 0.75, 0.15, 0.075, 0.015, 0.0075, 0.0015, 0.00075 or 0.00015 nmol of polypeptide or nucleic acid molecule per kg of body weight. The length of treatment needed to observe changes and the interval following treatment for responses to occur vary depending on the desired effect. The particular amounts may be determined by conventional tests which are well known to the person skilled in the art. In a tenth aspect the present invention relates to the polypeptide and/or the nucleic acid molecule as defined in connection with the first and second aspect of the invention; or the polypeptide, the nucleic acid molecule, and/or the vector as defined in connection with the first and second aspect of the invention; or the cell of the fourth aspect of the invention, the nucleic acid molecule of the fifth aspect of the invention, the host cell of the sixth aspect of the invention, the polypeptide of the eighth aspect of the invention, or a combination thereof for use in (i) inducing angiogenesis, or (ii) treating a disease selected from atherosclerotic diseases, peripheral arterial disease, wound healing disorders, stroke, infertility, scleroderma, ulcers, diabetic vascular complications, erectile dysfunction and heart disease. The present invention likewise pertains to a method of (i) inducing angiogenesis in patient in need thereof, or (ii) treating a patient suffering from a disease selected from atherosclerotic diseases, peripheral arterial disease, wound healing disorders, stroke, infertility, scleroderma, ulcers, diabetic vascular complications, erectile dysfunctionand heart disease by administering to said patient an therapeutically active amount of the polypeptide and/or the nucleic acid molecule as defined in connection with the first and second aspect of the invention; or the polypeptide, the nucleic acid molecule, and/or the vector as defined in connection with the first and second aspect of the invention; or the cell of the fourth aspect of the invention, the nucleic acid molecule of the fifth aspect of the invention, the host cell of the sixth aspect of the invention, the polypeptide of the eighth aspect of the invention, or a combination thereof. As commonly known, \"angiogenesis\" is the physiological process through which new blood vessels form. Inducing angiogenesis is consequently a means for treating diseases characterized by either poor vascularisation or abnormal angiogenesis. Several diseases, such as ischemic chronic wounds, are the result of failure or insufficient blood vessel formation and can be treated by a local expansion of blood vessels. Moreover, pro-angiogenic therapies are currently explored as options to treat cardiovascular diseases. A large number of preclinical studies have been performed with protein-, gene- and cell-based therapies in animal models of cardiac ischemia, as well as models of peripheral artery disease. A non-limiting list of diseases which are expected to benefit from inducing angiogenesis is: Atherosclerotic diseases, peripheral arterial disease, wound healing disorders, stroke, infertility, scleroderma, ulcers, diabetic vascular complications, erectile dysfunctionand heart disease. The figures show.\n Figure 1 Is an alignment of the amino acid sequence of human NPAS4 with the respective primate orthologs from chimpanzee, gorilla, orang-utan, gibbon, macaque, vervet, marmoset, and bushbaby. In the alignment the sequence of the bHLH domain is double underlined, the sequence of the PAS1 domain is underlined and the sequence of the PAS2 domain is dashed underlined. Figure 2 (A) Is an alignment of the amino acid sequence of human NPAS4 with the respective rodentia orthologs from mouse, rat, guinea pig, pika and squirrel. (B) Is an alignment of the amino acid sequence of human NPAS4 with the respective mammalian orthologs from megabat, pig, armadillo, opossum, cat, cow, elephant, Tasmanian devil, horse and sheep. In Figure 2 and (A) and (B) the sequence of the bHLH domain is double underlined, the sequence of the PAS1 domain is underlined and the sequence of the PAS2 domain is dashed underlined. Figure 3 Is an alignment of the amino acid sequence of human NPAS4 with the respective mammalian orthologs from megabat, pig, armadillo, opossum, cat, cow, elephant, Tasmanian devil, horse and sheep. In the alignment the sequence of the bHLH domain is double underlined, the sequence of the PAS1 domain is underlined and the sequence of the PAS2 domain is dashed underlined. Figure 4 Identification and analysis of candidate genes in the cloche locus. (A) Lateral views of Tg(kdrl:EGFP) sibling and clo s5 mutant embryos at 30 hpf. (B) Genetic map of the cloche locus on chromosome 13 showing meiotic recombination events for the indicated SSLP markers, with the critical region marked in red. (C) Physical map of the cloche locus based on GRCz10, including a 338kb sub-telomeric region of linkage group 13, which contains more than 25 gaps, and the 25kb unassigned scaffold, KN150101.1. Meiotic recombination events determined by genetic mapping are shown for the indicated markers. (D) Overview of the individual steps used to identify novel candidate genes in the cloche locus using the clo m39 deletion allele. (E) Genotyping of sibling and clo m39 mutant embryos using the SSLP markers z1496 (which is deleted in clo m39 mutants) and z1452 (which is not deleted in clo m39 mutants). (F) RNA-Seq expression differences for genes in clo m39 mutant versus wild-type sibling embryos, sorted by chromosomal position. (G) Table of candidate genes and the respective lesion(s) generated using TALEN or CRISPR/Cas9 technologies. Vascular morphology at 48 hpf was assessed by examining Tg(kdrl :EGFP) expression in embryos from F 0 to clo m39 /+ as well as F 1 heterozygous matings. Figure 5 npas4I is cloche. (A) Schematic representation of the npas4l genomic locus showing the CRISPR target site and the Δ8bp npas4I bns59 allele. (B) Illustration of the protein structures of Npas4I and Npas4I bns59 ; the Δ8bp npas4I bns59 mutation leads to a premature stop codon after 19 missense amino acids starting at amino acid 545. (C) Brightfield and confocal projections of Tg(kdrl:eGFP) sibling and npas4I bns59 / bns59 embryos at 28 hpf. (D) Whole-mount in situ hybridization showing the expression of etv2 and tal1 at 2 and 15-somite stages in npas4I + /+ and npas4I bns59 / bns59 embryos. (E) The npas4I bns59 mutation fails to complement the clo s5 mutation; 28 hpf Tg(kdrl:eGFP) embryos shown. (F) A single base mutation in Y136 leads to a premature stop codon in the clo s5 allele. (G) Illustration of the protein structures of Npas4I and Clo s5 . (H) Confocal projections of 26 hpf Tg(kdrl:eGFP) embryos injected with control or npas4l morpholinos. (I) Confocal projections of 28 hpf Tg(kdrl:eGFP) clo + /? , clo s5/s5 and clo s5/s5 embryos injected with 25pg npas4l mRNA; 2 different npas4l mRNA-injected clo s5/s5 embryos are shown in the images below. The yellow asterisk marks anterior endothelium and the white asterisk marks an anterior intersegmental vessel in a clo s5/s5 embryo injected with npas4l mRNA. The anterior most Tg(kdrl:eGFP) expression is non-vascular expression in pharyngeal arch endoderm. (J) Quantification of mRNA rescue of clo s5 mutants; 25pg of zebrafish npas4l or human NPAS4 mRNA was injected into one-cell stage embryos and the presence of anterior endothelial cells based on Tg(kdrl:eGFP) expression was recorded at 28 hpf. Figure 6 npas4l is expressed in endothelial and hematopoietic precursor cells and precedes the expression of the earliest endothelial and blood markers etv2 and tall: (A-C) RT-qPCR at various developmental stages for npas4I, etv2 and tal1 , normalized to 24 hpf. (D-O) Whole-mount in situ hybridization for npas4I, etv2 and tal1 at tailbud, 2- and 18-somite stages; the posterior part of the tailbud stage embryos is shown in D, H and L. ALPM, anterior lateral plate mesoderm; PLPM, posterior lateral plate mesoderm. Asterisk marks a unique rostromedial population of npas4l positive cells. Error bars represent SEM (n=3 biological replicates). Figure 7 Npas4I is a master regulator of the endothelial differentiation cascade: (A) RT-qPCR analysis of npas4l expression in tailbud stage embryos injected with etv2 MO, etv2 mRNA, tal1 MO or tal1 mRNA, normalized to uninjected embryos. (B) Whole-mount in situ hybridization for npas4l expression at the 2-somite stage in control, etv2 and tal1 morphant embryos. (C-D) Whole-mount in situ hybridization for etv2 (C) and tal1 (D) at shield stage in control and npas4l mRNA injected wild-type embryos. (E) Schematic illustration of Npas4I function; cloche / npas4 / is sufficient and necessary for the expression of early endothelial and hematopoietic markers such as etv2 and tal1. Error bars represent SEM (n=3 biological replicates). Figure 8 5' and 3' RACE PCR for npas4I : (A) Primer design was based on a 513bp fragment from GRCz10 that is deleted in the clo m39 allele. Agarose gels showing the products of 5' (B) and 3' (C) RACE PCRs using cDNAs generated from 24 hpf or tailbud mRNAs. Multiple fragments were cloned for sequencing and bands that extended the npas4l sequence to the 5' (B) and 3' (C) are highlighted in blue boxes. Figure 9 Phylogenetic analysis of Cloche/Npas4I: Phylogenetic tree based on the amino acid sequence of the bHLH domain (A) and the first PAS domain (B) of the human proteins NPAS1-NPAS4, HIF1, EPAS1 and AHR together with the protein encoded by cloche. Figure 10 Morpholino knockdown of npas4I: Knockdown of Npas4I was achieved by co-injecting an ATG morpholino targeting the npas4l pre-mRNA at its translational start site and a splice morpholino targeting the intron-exon splice site I2E3. (A) Schematic representation of the npas4l genomic locus including the I2E3 splice morpholino (red) and the primers used to test for splicing defects (black). (B) Analysis of the efficiency of the splice morpholino by RT-PCR shows a significant reduction of the npas4I wild-type mRNA at tailbud stage after injecting 6 ng of the I2E3 morpholino at the one cell stage (3 different experiments, sMO1-sMO3 are shown). uc= uninjected control, sMO=splice morpholino injected, H 2 O= water control. Size of wild-type product = 296bp. Figure 11 gata1 expression during early development: (A) RT-qPCR at various developmental stages for gata1. Whole mount in situ hybridization for gata1 on wild-type embryos at 2 (B) and 18 somite stages (C). Figure 12 Morpholino knockdown of tal1: Knockdown of Tal1 was achieved by injecting a previously published splice morpholino ( Dooley et al. (2005), Dev Biol., 15; 277(2):522-36 ). (B) Analysis of the efficiency of the splice morpholino by RT-PCR shows a significant reduction of the tal1 wild-type mRNA at the 2 somite stage after injecting 6.5 ng of the morpholino at the one cell stage. uc= uninjected control, sMO=splice morpholino injected, H 2 O= water control. Size of wild-type product = 401 bp. Figure 13 Genotyping primer sequences used herein for genetic mapping. Figure 14 Genomic loci with reduced expression in clo m39 mutants - mapping of sequencing reads from total and polyA enriched mRNA of clo m39 mutants and wild-type siblings identified 13 genomic loci of interest with reduced expression in clo m39 mutants. 11 of these loci correspond to identifiable genes (coding sequences/conserved domains). 10 of 13 loci are annotated in the telomeric region of Chr. 13, the others on unassembled scaffolds, including KN150101.1 (GRCZ10_NA449), a scaffold that contains an sslp marker ( tmem121 ) with strong linkage to the cloche mutation and the 3'end of the npas4I gene. Figure 15 Cloning and qRT-PCR Primers used herein listed by name, sequence, and function. The examples illustrate the invention. Example 1 - Material and Methods Zebrafish handling All zebrafish husbandry was performed under standard conditions in accordance with institutional (UCSF and MPG) and national ethical and animal welfare guidelines. Mutant lines were generated in the Tg(kdrl:GFP) s843 background ( Jin et al., 2005, Development;132:5199-209 ). Complementation tests were performed with clo s5 and clo m39 mutant lines. Overexpression studies were performed in AB embryos. Genetic mapping of the clo s5 allele and RNA-seq analysis of clo m39 For genetic mapping, fine mapping of the clo s5 allele was performed by genotyping homozygous mutant embryos with simple sequence length polymorphisms (SSLPs) identified in the locus. Individual genotyping primer sequences can be found in Fig. 13 . For RNA-seq analysis, individual embryos from clo m39 heterozygous intercrosses were collected at 90% epiboly and tailbud. Trizol extraction was perfomed on individual embryos to yield DNA and RNA. Briefly, single embryos were homogenized in Trizol reagent (Invitrogen) and phases were separated with chloroform. For DNA extraction, DNA was precipitated from the organic phase with ethanol, washed twice with 0.1M sodium citrate in 10% ethanol and once with 75% ethanol. The SSLP markers z1496 (0/7920) and z1452 (chr.16) were used for genotyping ( Fig. 15 ). Embryos positive for the z1452 PCR product but negative for z1496 were considered homozygous for the clo m39 deletion. Embryos positive for both products were considered wild-type siblings. For RNA extraction, the aqueous phase extracted from sibling or clo m39 / m39 embryos was pooled separately. RNA was precipitated using isopropanol and washed with 70% ethanol. Genomic DNA was removed by DNase treatment and total RNA was isolated using the Zymo Research RNA Clean & Concentrator kit. Random primed libraries were prepared from either total (DSN) or polyA selected RNA with an insert size of 200bp. Paired end sequencing was performed on an Illumina HighSeq 2000 instrument resulting in -40 million reads per condition. RNA-Seq data processing Data from poly(A)+ and total RNA sequencing were treated separately. Sequencing reads were aligned non-strand specifically to the zebrafish GRCz10 genome using Tophat v2.0.13 ( Kim et al. (2013), Genome Biol, 14(4), R36 ) with Bowtie v2.2.3.0 ( Langmead & Salzberg (2012), Nat Methods, 9(4), 357-359 ), guided by splice junctions defined by cDNA-to-genomic alignments from NCBI Release 104. Transcriptional units were defined separately for each sample using Cufflinks v2.2.1 ( Roberts et al. (2011), Bioinformatics, 27(17):2325-2329 ), and the resulting transcript GTF files were combined between samples (sibling and clo m39 / m39 ) and reconciled with NCBI gene annotations using the Cufflinks tool cuffmerge. To perform differential expression between sibling and clo m39 / m39 , read counts per gene for each sample were calculated using the Bedtools v2.21.0 intersect command (Quinlan & Hall, 2010) between the alignment BAM file and the exons defined above. Only reads with a MAPQ score > 0 aligning at least 5 nt of an exon were counted. Log2 fold change between sibling and clo m39 / m39 was calculated per gene using counts normalized per million aligned reads (RPM), with a pseudocount of 0.5 added to each count. To generate p values, the Cufflinks tool cuffdiff was used on the Cufflinks FPKM values of sibling versus clo m39 / m39 . Sequencing reads were also aligned to Danio rerio EST sequences from GenBank dbEST using Bowtie, and differential expression per EST between sibling and clo m39 / m39 was similarly calculated. Targeted mutagenesis using TALENs and CRISPR/Cas9 TALEN or CRISPR/Cas9 technology was used to target each of the candidate genes identified. TALEN-binding sites were selected using TALEN Targeter 2.0 (https://tale-nt.cac.cornell.edu/) and constructs were assembled as previously described ( Cermak et al. (2011), Nucleic Acids Res, 39(12) ; Beddell et al. (2012), Nature, 491:114-118 ). RNA was synthesized with mMESSAGE mMachine kit (Ambion) and between 100-150 pg per TALEN arm was injected into one-cell stage embryos to generate germline carrier founder (F 0 ) mutants. For CRISPR/Cas9, sgRNAs for candidate genes were designed using the CRISPR Design online toolbox (http://crispr.mit.edu). Guide RNAs were made by ligating annealed primers into the pT7-gRNA vector and the pT3Ts-nCas9n plasmid (Addgene) was used to synthesize Cas-9 mRNA as previously described ( Jao et al. (2013), PNAS 110:13904-13909 ). To generate germline carrier F 0 mutants, between 50-75 pg of sgRNA and 250-500 pg of Cas9 mRNA were co-injected into one-cell stage embryos. To determine the efficacy of individual TALEN or CRISPR/Cas9 injections, DNA was extracted from injected embryos at 48 hpf and subjected to high resolution melting analysis (HRMA) (Eco-Ilumina) and sequencing was used to assess TALEN or CRISPR/Cas9 efficiency. F 0 founders for each gene were identified by outcrossing TALEN or CRISPR/Cas9 injected fish with AB and screening the offspring at 48 hpf using HRMA. PCR products from F 0 founders that showed promising HRMA melt curves were cloned and sequenced, and those that gave interesting mutations (ie. frame-shifts) were grown and backcrossed to clo m39 in order to assess any possible vascular phenotype. Heterozygous intercrosses of individual adult F 1 Tg(kdrl:GFP) mutants were also used to assess any possible vascular phenotype. 5' and 3' Rapid Amplification of cDNA Ends (RACE) 5' and 3' RACE PCR was performed using the SMARTer RACE cDNA amplification kit (Clontech). Briefly, the following primers were used to amplify the 5' and 3' ends of the npas4l cDNA from 24 hpf and tailbud cDNA ( Fig. 15 ); 3'GSP1 - OAS1323; 3'GSP2 - OAS1324; 5'GSP1 - OAS1325; 5'GSP2 - OAS1326. Imaging Zebrafish embyos were immobilized with a low dose of tricaine and mounted in 1% low melting agarose (GeneMate). Brightfield images were acquired using a Nikon SMZ25 and confocal images were acquired using a Zeiss LSM780 with a W Plan-Apochromat 20X/NA 0.8 DIC objective lens. Whole-mount in situ hybridization Embryos were collected at different developmental stages and fixed with 4% paraformaldehyde in PBS at 4°C overnight. Whole-mount in situ hybridization was performed as described previously ( Thisse and Thisse (2008), Nat Protoc., 3(1):59-69 ). The npas4-like probe was generated with the following primers: ACTCGGGCATCAGGAGGATC and GACACCAGCATACGACACACAAC. T7 was used for transcription and digoxigenin for labeling (Roche). Images were acquired using a Nikon SMZ25. Expression Analysis RT-qPCR was performed in the CFX Connect Real-Time System (BIORAD). RNA was isolated utilizing Trizol (Sigma) and cDNA was synthesized using the Superscript III First-Strand synthesis system (Invitrogen). Histograms show the results of three different experiments (3 pools of embryos per developmental stage or treatment) and each pool consisted of 20-40 embryos. Primers were designed using PerlPrimer, and gapdh was used for normalization. Overexpression and rescue studies Full-length npas4l cDNA was amplified from cDNA and cloned into pCS2 + . mRNA was synthesized using the mMESSAGE mMACHINE kit and injected at different concentrations into 1-cell stage Tg(kdrl:eGFP) zebrafish embryos. Concentrations between 25-250 pg were tested to rescue clo s5 and clo m39 . As clo s5 and clo m39 mutants entirely lack anterior endothelium at 28 hpf, the presence of Tg(kdrl:eGFP) positive endothelial cells in the anterior of embryos was used to quantify the ability of each mRNA to rescue the clo phenotype. For overexpression studies, between 25-50 pg of npas4l mRNA was injected into AB embryos at the 1-cell stage. Phylogenetic Analysis A phylogenetic tree was calculated using Phylogeny.fr (Phylogeny.fr: robust phylogenetic analysis for the non-specialist) based on the amino acid sequence of the bHLH domain and the first PAS domain of the human proteins NPAS1-NPAS4, HIF1, EPAS1 and AHR together with the protein encoded by cloche with highly similar results (close similarity to NPAS4). The online tool was run with standard settings. Microinjection of morpholinos The following morpholinos (MOs) were purchased from GeneTools LLC (Philomath, OR) and injected at the indicated amounts:\n npas4I ATG MO (1 ng): GAGTCTCCGCAGCTCATCTCACA (SEQ ID NO: 33) npas4I I2E3 MO (6 ng): CACCTGGAACACACAGTGGAGGATT (SEQ ID NO: 34) tal1 MO (6.5 ng): AATGCTCTTACCATCGTTGATTTCA (SEQ ID NO: 35) (Dooley et al. (2005), loc. lit.) etv2 MO1 (4 ng): TTGGTACATTTCCATATCTTAAAGT (SEQ ID NO: 36) ( Sumanas and Lin (2006), PLos Biol. 4:e10 ) etv2 MO2 (4 ng): CACTGAGTCCTTATTTCACTATATC (SEQ ID NO: 37) (Sumanas and Lin (2006), loc. lit.) Genotyping High resolution melt analysis (HRMA) was used to genotype both the npas4I bns59 and clo s5 alleles. Embryos or fin-clips were placed in PCR tubes, with 50 µl of elution buffer (10 mM Tris-HCl, pH 8.5) containing 1 mg/ml Proteinase K and incubated at 55° C for 2 hrs. The samples were then heated to 95°C for 10 min to inactivate the Proteinase K. DyNAmo SYBR green (Thermo Fisher Scientific, Waltham, MA) was used to perform PCR and HRMA in an Eco Real-Time PCR System (Illumina, San Diego, CA). PCR protocols: 95°C for 15 sec, then 40 cycles of 95°C for 2 sec, 60°C for 2 sec, and 72°C for 2 sec. Following the PCR, a high-resolution melt curve was generated by collecting SYBR-green fluorescence data in the 65-95°C range. The analyses of genotype were performed on plots of normalised derivative fluorescence. Example 2 - Cloning and identification of the cloche gene npas4l The cloche locus was previously mapped to one of the telomeres of chromosome 13 as a CA repeat marker, z1496, which is tightly linked to the locus based on genotyping 2359 mutant embryos was identified 4 . In order to provide higher genetic resolution to the cloche region and narrow down the critical interval that contains the cloche mutation, an additional 7920 mutant embryos were genotyped for a total of 10,279, which allowed to identify additional zero recombinant markers as well as closely linked flanking markers ( Fig. 4B ; Fig. 13 ). Searching the available genomic databases led to the identification of several genes in the cloche locus including Iclat (aka lycat ) 13 , lbh, klhdc3, and inpp5a. These genes were sequenced in multiple different ENU-induced cloche alleles looking for significant genetic alterations and also carried out functional studies including morpholino knockdowns and mRNA rescues, but failed to generate fully convincing data that any of them corresponded to the cloche gene. Because the physical assembly of the cloche region did not match the available genetic map, and due to the large number of gaps in the assembly of the critical locus ( Fig. 4C ), it was reasoned that additional genes were located within the region and that one of them could be the cloche gene. In order to identify these missing genes, the cloche deletion allele m39 was used, which was determined as lacking a large number of genetic markers around the cloche locus 2 . In situ hybridization analyses examining the expression of the earliest known regulators of endothelial and hematopoietic cell differentiation, the ETS domain protein gene etv2 6 and the bHLH protein gene tal1 3,19-22 had determined that the earliest time one could observe differences between cloche mutants and their wild-type siblings was during early somitogenesis 3,7 (data not shown). Thus a large number of single embryos were collected from clo m39 heterozygous intercrosses between 90% epiboly and tail bud stages, reasoning that the gene should be expressed prior to the onset of the phenotype. From these individual embryos, both DNA and RNA was extracted, and after genotyping them with z1496, which is deleted in clo m39 mutants, and z1452, which is not deleted in clo m39 mutants ( Fig. 4D, E ), pooled wild-type and mutant RNA. Sequencing total RNA and polyA enriched RNA generated -40 million reads per sample, which were compared to the entire collection of Danio rerio expressed sequence tags (ESTs), and also mapped to GRCz10, the latest zebrafish genome assembly at the time. This extensive bioinformatics analysis led to the identification of several new candidate genes as well as previously identified genes in the cloche region ( Fig. 4F ; Fig. 14 ), which were then mutated using TALEN or CRISPR/Cas9 technologies. For each of these genes, identified founders carrying likely deleterious mutations were crossed to the clo m39 allele for complementation testing, and once available, the F1's were intercrossed to assess vascular morphology by examining Tg(kdrl:eGFP) expression in F2 embryos. Out of the 17 individual mutants tested in this manner, only npas4l mutants failed to complement the clo m39 allele, and displayed a vascular phenotype in the F2 generation ( Fig. 4G ). Confirming the speculation, npas4I did not map to the physical assembly of the cloche region but to a small, unassigned scaffold (KN150101.1, Fig. 4C ). From the RNA-seq data, a sequence translating into a continuous reading frame of 293 amino acids was identified that shows an identity of 33% over a length of 113 amino acids to the C-terminal region of Npas4 from Cynoglossus semilaevis. This sequence was used to design a CRISPR sgRNA to induce a molecular lesion in npas4I. To isolate a full-length npas4l cDNA, the sequence of this fragment was extended using 5' and 3' RACE ( Fig. 8 ) and a clone of 4286 bp encoding a PAS domain containing bHLH protein of 647 amino acids was assembled. This protein shares highest homology with NPAS4 ( Fig. 9 ), a key regulator of activity-regulated neuronal gene programs and memory formation in mouse 14-16 . The NPAS4 ortholog in Drosophila, Dysfusion, regulates the development of the trachea 17 , the fly vascular system, and Trachealess, an NPAS4 paralog, is a master regulator of tracheal cell fates 18,19 , indicating the importance of bHLH-PAS domain proteins in vascular development throughout evolution. The zebrafish genome comprises three npas4 genes, only two of which had been previously identified. Also the genomic region for the npas4l gene was assembled; since KN150101.1 did not contain the full npas4l sequence, whole-genome PacBio and Illumina sequencing data was used to extend the scaffold from a length of 25 kbp to 35 kbp. Both mapped RNA-seq reads and gene prediction by AUGUSTUS show that npas4I, like other npas4 genes, consists of eight exons ( Fig. 5A ), extending from 24 kbp to 29 kbp on the improved scaffold. In addition, the coding sequence for klhdc3 could be aligned in part to both a region upstream of npas4l and the end of the GRCz10 chromosome 13 sequence, confirming that the extended version of KN150101.1 should be placed in reverse-complementary orientation downstream of klhdc3 on chromosome 13. To further test whether npas4l is indeed the cloche gene, first the phenotype of the CRISPR-generated allele ( npas4I bns59 ) was analyzed, which carries an 8 bp deletion in the 3' end of the gene, leading to a premature stop codon at amino acid 545 after 19 missense amino acids ( Fig. 5B ) and vascular and blood gene expression defects ( Fig. 5C , D ) were observed, clearly recapitulating the cloche phenotype 1-3 . These epistasis experiments also revealed that npas4l acts upstream of etv2 and tal1 . Complementation analysis between npas4I bns59 and the ENU-induced allele clo s5 20 showed that these two mutations fail to complement ( Fig. 5E ), indicating that they are allelic. Sequencing the npas4I cDNA from clo s5 mutants revealed a stop codon at position 135, i.e., within the first PAS domain ( Fig. 5F, G ). Also a combination of ATG and splice site npas4l morpholinos was injected into wild-type embryos (Extended Data Fig. 6 ), and similarly severe blood vessel development defects were observed as those exhibited by clo mutants ( Fig. 5H ). Finally, it was found that injection of 25 pg of zebrafish npas4l or human NPAS4 mRNA into embryos from clo s5 heterozygous intercrosses at different concentrations rescued the anterior population of Tg(kdrl:eGFP) expressing endothelial cells in clo s5 mutants ( Fig. 5I, J ). Thus, the results from the genetic mapping, complementation studies with a CRISPR-generated allele, identification of a severe molecular lesion in an ENU-induced allele, morpholino knockdown and mRNA rescue experiments, clearly indicate that npas4l is the cloche gene. Example 3 - Functional studies on npas4I and its human ortholog NPAS4 Next the spatio-temporal expression pattern of npas4l in comparison with etv2 and tal1 was examined. RT-qPCR experiments showed that npas4l expression peaks prior to the end of gastrulation and is only weakly expressed by 24 hours post fertilization (hpf) ( Fig. 6A ), the stage when the heart starts beating, whereas etv2 and tal1 expression appear to peak at midsomitogenes is stages ( Fig. 6B, C ). Analysis of existing RNA-seq data sets 21 confirmed these observations ( Fig. 11 ). Whole-mount in situ hybridization studies show that npas4l expression precedes the onset of etv2 and tal1 expression ( Fig. 6D, H, L ), and that all three genes display a very similar expression pattern in the anterior and posterior lateral plate mesoderm, the tissue containing the endothelial and hematopoietic precursors. This expression pattern in the posterior lateral plate mesoderm is also similar to that exhibited by gata1a , which marks erythroid lineage cells and is clearly visible by the 2-somite stage ( Fig. 12 ). Notably, npas4l expression at early stages is uniquely observed in a rostromedial population of cells in the anterior lateral plate mesoderm ( Fig. 6E ; asterisk) that is initially negative for etv2 and tal1 expression ( Fig. 6I, M ), and likely corresponds to myeloid precursors. Similarly, in the posterior lateral plate mesoderm, npas4l expression appears to extend more posteriorly ( Fig. 6F ) compared to etv2 and tal1 expression ( Fig. 6J, N ), which may reflect its earlier activation in these endothelial and hematopoietic precursors. By the 18-somite stage, the levels of npas4l expression are clearly decreasing ( Fig. 6G ), in agreement with the RT-qPCR data, while the levels of etv2 and tal1 expression remain high ( Fig. 6K, O ). Thus, the onset of clo / npas4I expression precedes that of etv2 and tal1 ; clo / npas4I expression is also observed in cells that are negative for etv2 or tal1 expression, and after peaking at late gastrulation/early somitogenesis stages it is quickly down-regulated. In order to position clo / npas4I in the hierarchy of endothelial and hematopoietic regulators, gain- and loss-of-function experiments with etv2 and tal1 were conducted. Injection of etv2 or tal1 mRNA into one-cell stage embryos had no effect on npas4l expression when assessed by RT-qPCR ( Fig. 7A ). Similarly, morpholino-mediated knock-down of etv2 or tal1 ( Fig. 12 ) had no effect on npas4l expression when assessed by RT-qPCR ( Fig. 7A ) or whole-mount in situs ( Fig. 7B ). Conversely, injection of npas4l mRNA into one-cell stage embryos led to a broad upregulation of etv2 ( Fig. 7C ) and tal1 ( Fig. 7D ) expression at very early developmental stages. Altogether, these data show that Clo/Npas4I regulates the expression of the earliest known regulators of endothelial and hematopoietic differentiation, placing it at the top of the hierarchy ( Fig. 7E ). The identification of the Cloche protein as a transcriptional regulator has allowed its further functional analysis. Extensive loss- and now gain-of-function studies clearly show that Cloche functions at the top of a transcriptional cascade that drives the commitment of multipotent mesodermal cells to the endothelial and hematopoietic lineages. Considering its highly restricted expression pattern, it is likely that investigating the extrinsic signals that induce clo / npas4I expression will lead to additional insights into the control of mesoderm diversification including the commitment to the endothelial and hematopoietic lineages, and away from the cardiomyocyte lineage. Similarly, the identification of the Cloche protein will facilitate the discovery of additional regulators of endothelial and hematopoietic development. It has been reported that an NPAS4, the aryl hydrocarbon receptor AHR, can modulate the expansion and differentiation of human hematopoietic progenitors 21 . These reports, together with fly studies 17-19 and the data herein showing that zebrafish as well as human NPAS4 can regulate the expression of early endothelial and hematopoietic lineages strongly implicate members of this family in controlling the formation of the hemato-vascular system throughout evolution. More broadly, the elucidation of Cloche/NPAS4 provides new avenues towards developing novel strategies for lineage reprogramming of stem/progenitor cells into endothelium and blood for regenerative medicine. REFERENCES \n 1 Stainier, D. Y., Weinstein, B. M., Detrich, H. W., 3rd, Zon, L. I. & Fishman, M. C. 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A common progenitor for haematopoietic and endothelial lineages in the zebrafish gastrula. Nature 443, 337-39 (2006 ). 13 Xiong, J. W., Yu, Q., Zhang, J. & Mably, J. D. An acyltransferase controls the generation of hematopoietic and endothelial lineages in zebrafish. Circ Res 102, 1057-1064 (2008 ). 14 Lin, Y. et al. Activity-dependent regulation of inhibitory synapse development by Npas4. Nature 455, 1198-1204 (2008 ). 15 Ooe, N., Saito, K., Mikami, N., Nakatuka, I. & Kaneko, H. Identification of a novel basic helix-loop-helix-PAS factor, NXF, reveals a Sim2 competitive, positive regulatory role in dendritic-cytoskeleton modulator drebrin gene expression. Mol Cell Biol 24, 608-616 (2004 ). 16 Spiegel, I. et al. Npas4 regulates excitatory-inhibitory balance within neural circuits through cell-type-specific gene programs. Cell 157, 1216-1229 (2014 ). 17 Jiang, L. & Crews, S. T. The Drosophila dysfusion basic helix-loop-helix (bHLH)-PAS gene controls tracheal fusion and levels of the trachealess bHLH-PAS protein. Mol Cell Biol 23, 5625-5637 (2003 ). 18 Wilk, R., Weizman, I., & Shilo, B. Z. trachealess encodes a bHLH-PAS protein that is an inducer of tracheal cell fates in Drosophila. Genes Dev 10, 93-102 (1996 ). 19 Isaac, D. D. & Andrew, D. J. Tubulogenesis in Drosophila: a requirement for the trachealess gene product. Genes Dev 10, 103-117 (1996 ). 20 Field, H. A., Dong, P. D., Beis, D. & Stainier, D. Y. Formation of the digestive system in zebrafish. II. Pancreas morphogenesis. Dev Biol 261, 197-208 (2003 ). 21 Pauli A. et al. Systematic identification of long noncoding RNAs expressed during zebrafish embryogenesis. 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Neuronal PAS domain protein 4 (NPAS4) function in the progenitor cells."],"number":1,"annotation":false,"claim":true,"title":false},{"lines":["A method for producing hematopoietic cells from progenitor cells, said method comprising inducing NPAS4 function in the progenitor cells."],"number":2,"annotation":false,"claim":true,"title":false},{"lines":["The method of claim 1, wherein the progenitor cells are embryonic stem cells (ESCs), induced pluripotent stem cells (iPS), mesodermal progenitor cells, hemangioblasts, endothelial progenitor cells (EPCs), fibroblasts or a mixture thereof."],"number":3,"annotation":false,"claim":true,"title":false},{"lines":["The method of claim 2, wherein the progenitor cells are embryonic stem cells (ESCs), induced pluripotent stem cells (iPSs), mesodermal progenitor cells, hemangioblasts, angioblasts, hematopoietic stem cells (HSCs), or a mixture thereof."],"number":4,"annotation":false,"claim":true,"title":false},{"lines":["The method of any one of claims 1 to 4, wherein the NPAS4 function is induced by
(a) a polypeptide comprising or consisting of human NPAS4 or a species ortholog thereof; or
(b) a nucleic acid molecule encoding the amino acid sequence of (a)."],"number":5,"annotation":false,"claim":true,"title":false},{"lines":["The method of any one of claims 1 to 4, wherein the NPAS4 function is induced by
(i) a polypeptide comprising or consisting of an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31;
(ii) a polypeptide being at least 60% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs: 1 to 31;
(iii) a polypeptide comprising at least 600 amino acids, wherein the N-terminal portion of said polypeptide is at least 80% identical to the N-terminal half of an amino acid sequence being selected from the group consisting of SEQ ID NOs: 1 to 31;
(iv) a polypeptide being at least 20% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 outside the bHLH domain, the PAS1 domain and the PAS2 domain, being at least 75% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 inside the bHLH domain, and being at least 50% identical to an amino acid sequence being selected from the group consisting of SEQ ID NOs 1 to 31 inside the PAS1 domain and the PAS2 domain;
(v) a nucleic acid molecule encoding the polypeptide of any one of (i) to (iv); and/or
(vi) a vector comprising the nucleic acid molecule of (v)."],"number":6,"annotation":false,"claim":true,"title":false},{"lines":["A method for producing cardiomyocytes from progenitor cells, said method comprising inhibiting NPAS4 function in the progenitor cell."],"number":7,"annotation":false,"claim":true,"title":false},{"lines":["The method of claim 7, wherein the progenitor cells are embryonic stem cells (ESCs), induced pluripotent stem cells (iPSs), mesodermal progenitor cells, cardiomyocyte progenitor cells, or a mixture thereof."],"number":8,"annotation":false,"claim":true,"title":false},{"lines":["The method of claim 7 or 8, wherein the NPAS4 function is inhibited by
(a) a dominant negative mutant of NPAS4 or a species ortholog thereof or a nucleic acid molecule encoding the same;
(b) an aptamer, a ribozyme, an antibody, a protein drug, or a small molecule inhibitor against NPAS-4 or a species ortholog thereof; and/or
(c) a siRNA, a shRNA, a morpholino, a microRNA, or an antisense nucleic acid specifically interacting with a nucleic acid molecule encoding NPAS-4 or a species ortholog thereof."],"number":9,"annotation":false,"claim":true,"title":false},{"lines":["The method of any one of claims 1 to 9 being an ex vivo or in vitro method."],"number":10,"annotation":false,"claim":true,"title":false},{"lines":["A cell produced by the method of any one of claims 1 to 10."],"number":11,"annotation":false,"claim":true,"title":false},{"lines":["A nucleic acid molecule encoding a transcription factor having Npas4-like function, wherein the nucleic acid molecule is selected from the group consisting of
(i) a nucleic acid molecule encoding the amino acid sequence of SEQ ID NO: 25;
(ii) a nucleic acid molecule comprising or consisting of SEQ ID NO: 32;
(iii) a nucleic acid molecule encoding an amino acid sequence being at least 70% identical to SEQ ID NO: 25;
(iv) a nucleic acid molecule encoding an amino acid sequence comprising at least 600 amino acids, wherein the N-terminal portion of said polypeptide is at least 80% identical to the N-terminal half of the amino acid sequence of SEQ ID NO: 32;
(v) a nucleic acid molecule encoding an amino acid sequence being at least 60% identical to the amino acid sequence of SEQ ID NO: 25 outside the bHLH domain, the PAS1 domain and the PAS2 domain, being at least 90% identical to the amino acid sequence of SEQ ID NO: 25 inside the bHLH domain, and being at least 80% identical to the amino acid sequence of SEQ ID NO: 25 inside the PAS1 domain and the PAS2 domain; or
(vi) a vector comprising the nucleic acid molecule of any one of (i) to (v)."],"number":12,"annotation":false,"claim":true,"title":false},{"lines":["A polypeptide encoded by the nucleic acid molecule of claim 12."],"number":13,"annotation":false,"claim":true,"title":false},{"lines":["A pharmaceutical composition comprising
(i) the polypeptide and/or the nucleic acid molecule as defined in claim 5; or the polypeptide, the nucleic acid molecule, and/or the vector as defined in claim 6; and/or
(ii) the cell of claim 11, the nucleic acid molecule of claim 12, the polypeptide of claim 13, or a combination thereof."],"number":14,"annotation":false,"claim":true,"title":false},{"lines":["The polypeptide and/or the nucleic acid molecule as defined in claim 5; or the polypeptide, the nucleic acid molecule, the vector as defined in claim 6; or the cell of claim 11, the nucleic acid molecule of claim 12, the polypeptide of claim 13, or a combination thereof for use in (i) inducing angiogenesis, or (ii) treating a disease selected from atherosclerotic diseases, peripheral arterial disease, wound healing disorders, stroke, infertility, scleroderma, ulcers, diabetic vascular complications, erectile dysfunction and heart disease."],"number":15,"annotation":false,"claim":true,"title":false}]}},"filters":{"npl":[],"notNpl":[],"applicant":[],"notApplicant":[],"inventor":[],"notInventor":[],"owner":[],"notOwner":[],"tags":[],"dates":[],"types":[],"notTypes":[],"j":[],"notJ":[],"fj":[],"notFj":[],"classIpcr":[],"notClassIpcr":[],"classNat":[],"notClassNat":[],"classCpc":[],"notClassCpc":[],"so":[],"notSo":[],"sat":[]},"sequenceFilters":{"s":"SEQIDNO","d":"ASCENDING","p":0,"n":10,"sp":[],"si":[],"len":[],"t":[],"loc":[]}}