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Am J Hum Genet. 2010 Mar 12;86(3):479-84. doi: 10.1016/j.ajhg.2010.02.003. Epub 2010 Feb 18.

Mutations in TPRN cause a progressive form of autosomal-recessive nonsyndromic hearing loss.

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  • 1Center for Molecular Medicine Cologne (CMMC), University of Cologne, 50931 Cologne, Germany.

Abstract

We performed genome-wide homozygosity mapping in a large consanguineous family from Morocco and mapped the autosomal-recessive nonsyndromic hearing loss (ARNSHL) in this family to the DFNB79 locus on chromosome 9q34. By sequencing of 62 positional candidate genes of the critical region, we identified a causative homozygous 11 bp deletion, c.42_52del, in the TPRN gene in all seven affected individuals. The deletion is located in exon 1 and results in a frameshift and premature protein truncation (p.Gly15AlafsX150). Interestingly, the deleted sequence is part of a repetitive and CG-rich motive predicted to be prone to structural aberrations during crossover formation. We identified another family with progressive ARNSHL linked to this locus, whose affected members were shown to carry a causative 1 bp deletion (c.1347delG) in exon 1 of TPRN. The function of the encoded protein, taperin, is unknown; yet, partial homology to the actin-caping protein phostensin suggests a role in actin dynamics.

Copyright 2010 The American Society of Human Genetics. Published by Elsevier Inc. All rights reserved.

PMID:
20170898
[PubMed - indexed for MEDLINE]
PMCID:
PMC2833376
Free PMC Article

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