ADGRV1, also known as G protein-coupled receptor 98 (GPR98) or Very Large G-protein coupled receptor 1 (VLGR1), is a protein that in humans is encoded by the GPR98gene.[5] Several alternatively spliced transcripts have been described.[5]
The adhesion GPCR VLGR1 is the largest GPCR known, with a size of 6300 amino acids and consisting of 90 exons.[6] There are 8 splice variants of VlgR1, named VlgR1a-1e and Mass1.1-1.3. The N-terminus consists of 5800 amino acids containing 35 Calx-beta domains, one pentraxin domain, and one epilepsy associated repeat. Mutations of VlgR1 have been shown to result in Usher's syndrome. Knockouts of Vlgr1 in mice have been shown to phenocopy Usher's syndrome and lead to audiogenic seizures.
This gene encodes a member of the adhesion-GPCR family of receptors.[7] The protein binds calcium and is expressed in the central nervous system. It is also known as very large G-protein coupled receptor 1 because it is 6300 residues long. It contains a C-terminal 7-transmembrane receptor domain, whereas the large N-terminal segment (5900 residues) includes 35 calcium binding Calx-beta domains, and 6 EAR domains.
^Sun JP, Li R, Ren HZ, Xu AT, Yu X, Xu ZG (May 2013). "The very large G protein coupled receptor (Vlgr1) in hair cells". Journal of Molecular Neuroscience. 50 (1): 204–214. doi:10.1007/s12031-012-9911-5. PMID23180093. S2CID16730555.
^Stacey M, Yona S (2011). AdhesionGPCRs: Structure to Function (Advances in Experimental Medicine and Biology). Berlin: Springer. ISBN978-1-4419-7912-4.
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Nakayama J, Fu YH, Clark AM, Nakahara S, Hamano K, Iwasaki N, et al. (November 2002). "A nonsense mutation of the MASS1 gene in a family with febrile and afebrile seizures". Annals of Neurology. 52 (5): 654–657. doi:10.1002/ana.10347. PMID12402266. S2CID36357793.
Bjarnadóttir TK, Fredriksson R, Höglund PJ, Gloriam DE, Lagerström MC, Schiöth HB (July 2004). "The human and mouse repertoire of the adhesion family of G-protein-coupled receptors". Genomics. 84 (1): 23–33. doi:10.1016/j.ygeno.2003.12.004. PMID15203201.
Fu GK, Wang JT, Yang J, Au-Young J, Stuve LL (July 2004). "Circular rapid amplification of cDNA ends for high-throughput extension cloning of partial genes". Genomics. 84 (1): 205–210. doi:10.1016/j.ygeno.2004.01.011. PMID15203218.
Schwartz SB, Aleman TS, Cideciyan AV, Windsor EA, Sumaroka A, Roman AJ, et al. (February 2005). "Disease expression in Usher syndrome caused by VLGR1 gene mutation (USH2C) and comparison with USH2A phenotype". Investigative Ophthalmology & Visual Science. 46 (2): 734–743. doi:10.1167/iovs.04-1136. PMID15671307.