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Mutations in the VLGR 1 gene implicate G-protein signaling in the pathogenesis of Usher syndrome type II
Örebro University, School of Health and Medical Sciences.ORCID iD: 0000-0001-6557-6359
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2004 (English)In: American Journal of Human Genetics, ISSN 0002-9297, E-ISSN 1537-6605, Vol. 74, no 2, 357-366 p.Article in journal (Refereed) Published
Abstract [en]

Usher syndrome type II (USH2) is a genetically heterogeneous autosomal recessive disorder with at least three genetic subtypes (USH2A, USH2B, and USH2C) and is classified phenotypically as congenital hearing loss and progressive retinitis pigmentosa. The VLGR1 (MASS1) gene in the 5q14.3-q21.1 USH2C locus was considered a likely candidate on the basis of its protein motif structure and expressed-sequence-tag representation from both cochlear and retinal subtracted libraries. Denaturing high-performance liquid chromatography and direct sequencing of polymerase-chain-reaction products amplified from 10 genetically independent patients with USH2C and 156 other patients with USH2 identified four isoform-specific VLGR1 mutations (Q2301X, I2906FS, M2931FS, and T6244X) from three families with USH2C, as well as two sporadic cases. All patients with VLGR1 mutations are female, a significant deviation from random expectations. The ligand(s) for the VLGR1 protein is unknown, but on the basis of its potential extracellular and intracellular protein-protein interaction domains and its wide mRNA expression profile, it is probable that VLGR1 serves diverse cellular and signaling processes. VLGR1 mutations have been previously identified in both humans and mice and are associated with a reflex-seizure phenotype in both species. The identification of additional VLGR1 mutations to test whether a phenotype/genotype correlation exists, akin to that shown for other Usher syndrome disease genes, is warranted.

Place, publisher, year, edition, pages
2004. Vol. 74, no 2, 357-366 p.
National Category
Medical and Health Sciences
Research subject
Medicine
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URN: urn:nbn:se:oru:diva-10292OAI: oai:DiVA.org:oru-10292DiVA: diva2:306878
Available from: 2010-03-31 Created: 2010-03-31 Last updated: 2016-12-16Bibliographically approved

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