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Protein Page:
PAX6 (human)

PAX6 Transcription factor with important functions in the development of the eye, nose, central nervous system and pancreas. Required for the differentiation of pancreatic islet alpha cells. Competes with PAX4 in binding to a common element in the glucagon, insulin and somatostatin promoters. Regulates specification of the ventral neuron subtypes by establishing the correct progenitor domains. Isoform 5a appears to function as a molecular switch that specifies target genes. Defects in PAX6 are the cause of aniridia (AN). A congenital, bilateral, panocular disorder characterized by complete absence of the iris or extreme iris hypoplasia. Aniridia is not just an isolated defect in iris development but it is associated with macular and optic nerve hypoplasia, cataract, corneal changes, nystagmus. Visual acuity is generally low but is unrelated to the degree of iris hypoplasia. Glaucoma is a secondary problem causing additional visual loss over time. Defects in PAX6 are a cause of Peters anomaly (PAN). Peters anomaly consists of a central corneal leukoma, absence of the posterior corneal stroma and Descemet membrane, and a variable degree of iris and lenticular attachments to the central aspect of the posterior cornea. Defects in PAX6 are a cause of foveal hypoplasia (FOVHYP). Foveal hypoplasia can be isolated or associated with presenile cataract. Inheritance is autosomal dominant. Defects in PAX6 are a cause of keratitis hereditary (KERH). An ocular disorder characterized by corneal opacification, recurrent stromal keratitis and vascularization. Defects in PAX6 are a cause of coloboma of iris choroid and retina (COI); also known as uveoretinal coloboma. Ocular colobomas are a set of malformations resulting from abnormal morphogenesis of the optic cup and stalk, and the fusion of the fetal fissure (optic fissure). Severe colobomatous malformations may cause as much as 10% of the childhood blindness. The clinical presentation of ocular coloboma is variable. Some individuals may present with minimal defects in the anterior iris leaf without other ocular defects. More complex malformations create a combination of iris, uveoretinal and/or optic nerve defects without or with microphthalmia or even anophthalmia. Defects in PAX6 are a cause of coloboma of optic nerve (COLON). Defects in PAX6 are a cause of bilateral optic nerve hypoplasia (BONH); also known as bilateral optic nerve aplasia. A congenital anomaly in which the optic disc appears abnormally small. It may be an isolated finding or part of a spectrum of anatomic and functional abnormalities that includes partial or complete agenesis of the septum pellucidum, other midline brain defects, cerebral anomalies, pituitary dysfunction, and structural abnormalities of the pituitary. Defects in PAX6 are a cause of aniridia cerebellar ataxia and mental deficiency (ACAMD); also known as Gillespie syndrome. A rare condition consisting of partial rudimentary iris, cerebellar impairment of the ability to perform coordinated voluntary movements, and mental retardation. Belongs to the paired homeobox family. 3 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: Motility/polarity/chemotaxis; DNA-binding; Transcription factor
Chromosomal Location of Human Ortholog: 11p13
Cellular Component: nucleoplasm; nuclear chromatin; cytoplasm; nucleus
Molecular Function: histone acetyltransferase binding; protein binding; DNA binding; AT DNA binding; ubiquitin protein ligase binding; double-stranded DNA binding; ubiquitin-protein ligase activity; chromatin binding; transcription factor activity; protein kinase binding; transcription factor binding
Biological Process: central nervous system development; positive regulation of transcription, DNA-dependent; protein ubiquitination; cell fate determination; glucose homeostasis; positive regulation of epithelial cell differentiation; cerebellum development; neural crest cell migration; positive regulation of neuroblast proliferation; positive regulation of cell fate specification; neuron fate commitment; oligodendrocyte cell fate specification; interkinetic nuclear migration; keratinocyte differentiation; forebrain-midbrain boundary formation; negative regulation of neuron differentiation; eye photoreceptor cell development; organ morphogenesis; response to ethanol; cellular response to insulin stimulus; retina development in camera-type eye; rhombomere morphogenesis; forebrain anterior/posterior pattern formation; regulation of transcription from RNA polymerase II promoter involved in somatic motor neuron fate commitment; positive regulation of transcription from RNA polymerase II promoter; lens development in camera-type eye; transcription from RNA polymerase II promoter; axon guidance; regulation of asymmetric cell division; neuron migration; forebrain dorsal/ventral pattern formation; dorsal/ventral axis specification; negative regulation of transcription from RNA polymerase II promoter; cerebral cortex regionalization; negative regulation of neurogenesis; astrocyte differentiation; visual perception; negative regulation of protein amino acid phosphorylation; establishment of mitotic spindle orientation; salivary gland morphogenesis; response to wounding; lacrimal gland development; regulation of timing of cell differentiation; negative regulation of epithelial cell proliferation; blood vessel development; smoothened signaling pathway; olfactory bulb development; eye development; commitment of a neuronal cell to a specific type of neuron in the forebrain; protein localization in organelle; pituitary gland development; regulation of transcription from RNA polymerase II promoter involved in ventral spinal cord interneuron specification; regulation of transcription from RNA polymerase II promoter involved in spinal cord motor neuron fate specification; embryonic camera-type eye morphogenesis
Disease: Wilms Tumor, Aniridia, Genitourinary Anomalies, And Mental Retardation Syndrome; Peters Anomaly; Coloboma Of Optic Nerve; Keratitis, Hereditary; Aniridia, Cerebellar Ataxia, And Mental Retardation; Aniridia; Foveal Hypoplasia 1; Optic Nerve Hypoplasia, Bilateral
Reference #:  P26367 (UniProtKB)
Alt. Names/Synonyms: AN; AN2; Aniridia type II protein; D11S812E; MGC17209; MGDA; Oculorhombin; paired box 6; paired box homeotic gene-6; Paired box protein Pax-6; PAX6; WAGR
Gene Symbols: PAX6
Molecular weight: 46,683 Da
Basal Isoelectric point: 9.45  Predict pI for various phosphorylation states
CST Pathways:  Growth And Differentiation Control by MAPKs  |  Regulation of P38 MAPKs
Select Structure to View Below


Protein Structure Not Found.

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Modification Sites and Domains  

Modification Sites in Parent Protein, Orthologs, and Isoforms  

Show Multiple Sequence Alignment


LTP: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.


HTP: The number of records in which this modification site was assigned using ONLY proteomic discovery-mode mass spectrometry.


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  PAX6 iso2  

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