Norrin, also known as Norrie disease protein or X-linked exudative vitreoretinopathy 2 protein (EVR2) is a protein that in humans is encoded by the NDP gene. [5] Mutations in the NDP gene are associated with the Norrie disease.
Signaling induced by the protein Norrin regulates vascular development of vertebrate retina and controls important blood vessels in the ear. [5] Norrin binds with high affinity to Frizzled 4, and Frizzled 4 knockout mice exhibit abnormal vascular development of the retina.
NDP is the genetic locus identified as harboring mutations that result in Norrie disease. Norrie disease is a rare genetic disorder characterized by bilateral congenital blindness that is caused by a vascularized mass behind each lens due to a maldeveloped retina (pseudoglioma). [5]
Norrie disease is a rare disease and genetic disorder that primarily affects the eyes and almost always leads to blindness. It is caused by mutations in the Norrin cystine knot growth factor (NDP) gene, which is located on the X chromosome. In addition to the congenital ocular symptoms, the majority of patients experience a progressive hearing loss starting mostly in their 2nd decade of life, and some may have learning difficulties among other additional characteristics.
The CLCN family of voltage-dependent chloride channel genes comprises nine members which demonstrate quite diverse functional characteristics while sharing significant sequence homology. The protein encoded by this gene regulates the electric excitability of the skeletal muscle membrane. Mutations in this gene cause two forms of inherited human muscle disorders: recessive generalized myotonia congenita (Becker) and dominant myotonia (Thomsen).
G-protein coupled receptor 143, also known as Ocular albinism type 1 (OA1) in humans, is a conserved integral membrane protein with seven transmembrane domains and similarities with G protein-coupled receptors (GPCRs) that is expressed in the eye and epidermal melanocytes. This protein encoded by the GPR143 gene, whose variants can lead to Ocular albinism type 1.
Frizzled-4(Fz-4) is a protein that in humans is encoded by the FZD4 gene. Fz-4 has also been designated as CD344.
Wolframin is a protein that in humans is encoded by the WFS1 gene.
Exostosin-1 is a protein that in humans is encoded by the EXT1 gene.
Myotubularin is a protein that in humans is encoded by the MTM1 gene.
Eyes absent homolog 1 is a protein that in humans is encoded by the EYA1 gene.
Beta-sarcoglycan is a protein that in humans is encoded by the SGCB gene.
Gap junction beta-3 protein (GJB3), also known as connexin 31 (Cx31) — is a protein that in humans is encoded by the GJB3 gene.
McKusick–Kaufman/Bardet–Biedl syndromes putative chaperonin is a protein that in humans is encoded by the MKKS gene.
Cyclic nucleotide gated channel beta 3, also known as CNGB3, is a human gene encoding an ion channel protein.
Tubby-related protein 1 is a protein that in humans is encoded by the TULP1 gene.
Bardet–Biedl syndrome 1 protein is a protein that in humans is encoded by the BBS1 gene. BBS1 is part of the BBSome complex, which required for ciliogenesis. Mutations in this gene have been observed in patients with the major form of Bardet–Biedl syndrome.
Rod outer segment membrane protein 1 is a protein that in humans is encoded by the ROM1 gene.
Eyes absent homolog 4 is a protein that in humans is encoded by the EYA4 gene.
Bardet–Biedl syndrome 2 protein is a protein that in humans is encoded by the BBS2 gene.
NHL repeat-containing protein 1 is a protein that in humans is encoded by the NHLRC1 gene.
Membrane frizzled-related protein is a protein that in humans is encoded by the MFRP gene.
Meckel syndrome, type 1 also known as MKS1 is a protein that in humans is encoded by the MKS1 gene.