Zebrafish Npas4l Antibody / Cloche / Neuronal PAS domain-containing protein 4-like

Npas4l is unique to zebrafish and closely related teleost species, and it does not have a confirmed one to one ortholog in humans. However, it is functionally analogous to members of the NPAS family of transcription factors in mammals, particularly those involved in neurogenesis and vascular development. Its closest functional equivalents in mammals are believed to include NPAS4 and potentially other early endothelial regulators, although no direct human counterpart fully recapitulates its role in vascular progenitor specification. In zebrafish embryos, Npas4l is expressed in the lateral plate mesoderm where it acts upstream of critical genes such as etsrp and tal1, which drive endothelial and hematopoietic differentiation. Loss of Npas4l results in the absence of blood and most vascular structures, making it essential for cardiovascular development. Because of its pivotal and early role in blood and vessel formation, zebrafish Npas4l is a widely used genetic marker and model in studies of hematopoiesis, angiogenesis, and transcriptional regulation. It is especially valuable for dissecting the gene regulatory networks that control endothelial cell fate decisions in vertebrate embryos.