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Mutation analysis of TMC1 identifies four new mutations and suggests an additional deafness gene at loci DFNA36 and DFNB7/11.

Abstract：

:Hearing loss is the most frequent sensorineural disorder affecting 1 in 1000 newborns. In more than half of these babies, the hearing loss is inherited. Hereditary hearing loss is a very heterogeneous trait with about 100 gene localizations and 44 gene identifications for non-syndromic hearing loss. Transmembrane channel-like gene 1 (TMC1) has been identified as the disease-causing gene for autosomal dominant and autosomal recessive non-syndromic hearing loss at the DFNA36 and DFNB7/11 loci, respectively. To date, 2 dominant and 18 recessive TMC1 mutations have been reported as the cause of hearing loss in 34 families. In this report, we describe linkage to DFNA36 and DFNB7/11 in 1 family with dominant and 10 families with recessive non-syndromic sensorineural hearing loss. In addition, mutation analysis of TMC1 was performed in 51 familial Turkish patients with autosomal recessive hearing loss. TMC1 mutations were identified in seven of the families segregating recessive hearing loss. The pathogenic variants we found included two known mutations, c.100C>T and c.1165C>T, and four new mutations, c.2350C>T, c.776+1G>A, c.767delT and c.1166G>A. The absence of TMC1 mutations in the remaining six linked families implies the presence of mutations outside the coding region of this gene or alternatively at least one additional deafness-causing gene in this region. The analysis of copy number variations in TMC1 as well as DNA sequencing of 15 additional candidate genes did not reveal any proven pathogenic changes, leaving both hypotheses open.

journal_name

Clin Genet

journal_title

Clinical genetics

authors

Hilgert N,Alasti F,Dieltjens N,Pawlik B,Wollnik B,Uyguner O,Delmaghani S,Weil D,Petit C,Danis E,Yang T,Pandelia E,Petersen MB,Goossens D,Favero JD,Sanati MH,Smith RJ,Van Camp G

doi

10.1111/j.1399-0004.2008.01053.x

subject

Has Abstract

pub_date

2008-09-01 00:00:00

pages

223-32

issue

3

eissn

0009-9163

issn

1399-0004

pii

CGE1053

journal_volume

74

pub_type

杂志文章

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