Islet 1

Expressed in the forming heart in the stage 9 embryo, in the myocardial trough, and then at stages 10 to 11, in the nondifferentiated mesodermal cells at the venous and arterial poles, as well as cells of the dorsal coelomic wall and ruptured mesocardium (at protein level).

DNA-binding transcriptional activator. Recognizes and binds to the consensus octamer binding site 5'-ATAATTAA-3' in promoter of target genes. Plays a fundamental role in the gene regulatory network essential for retinal ganglion cell (RGC) differentiation. Cooperates with the transcription factor POU4F2 to achieve maximal levels of expression of RGC target genes and RGC fate specification in the developing retina. Involved in the specification of motor neurons in cooperation with LHX3 and LDB1 (By similarity). Binds to insulin gene enhancer sequences (By similarity). Essential for heart development. Marker of one progenitor cell population that give rise to the outflow tract, right ventricle, a subset of left ventricular cells, and a large number of atrial cells as well, its function is required for these progenitors to contribute to the heart. Controls the expression of FGF and BMP growth factors in this cell population and is required for proliferation and survival of cells within pharyngeal foregut endoderm and adjacent splanchnic mesoderm as well as for migration of cardiac progenitors into the heart (By similarity).

Ubiquitinated probably by WWP1 E3 ubiquitin ligase; ubiquitination is followed by protein degradation.

Phosphorylated.

Expressed in subsets of neurons of the adrenal medulla and dorsal root ganglion, inner nuclear and ganglion cell layers in the retina, the pineal and some regions of the brain.

• Nucleus

Insulin gene enhancer protein ISL-1, Islet-1, ISL1

• entrezGene:3670
• omim:600366
• swissprot:P61371

Proteins

Neuroscience

39036Da