Abstract:
:We report here the clinical, genetic, and molecular characteristics of a large Chinese family exhibiting non-syndromic, late-onset autosomal dominant sensorineural hearing loss. Clinical evaluation revealed variable phenotypes of hearing loss in terms of severity and age-at-onset of disease in these subjects. Genome-wide linkage analysis mapped the disease gene to the DFNA5 locus with a maximum two-point log odds score of 5.39 at [theta] = 0 for marker D7S2457. DNA sequencing of DFNA5 revealed a novel heterozygous IVS8+4 A>G substitution in the splice donor site of intron 8. Reverse transcriptase-polymerase chain reaction (RT-PCR) showed skipping of exon 8 in the mutant transcript. This mutation faithfully cosegregated with hearing loss in the family. In addition, the mutation was absent in 100 unrelated control DNA samples of Chinese origin. The IVS8+4 A>G mutation is predicted to create a shift in the reading frame and introduce a stop codon at position 372, thereby resulting in a prematurely truncated DFNA5 protein. Up to date, a total of four mutations in DFNA5 have been reported to lead to hearing impairment, all of them result in skipping of exon 8 at the mRNA level. Our findings provide further support for the hypothesis that DFNA5-associated hearing loss is caused by a very specific gain-of-function mutation.
journal_name
Clin Genetjournal_title
Clinical geneticsauthors
Cheng J,Han DY,Dai P,Sun HJ,Tao R,Sun Q,Yan D,Qin W,Wang HY,Ouyang XM,Yang SZ,Cao JY,Feng GY,Du LL,Zhang YZ,Zhai SQ,Yang WY,Liu XZ,He L,Yuan HJdoi
10.1111/j.1399-0004.2007.00889.xsubject
Has Abstractpub_date
2007-11-01 00:00:00pages
471-7issue
5eissn
0009-9163issn
1399-0004pii
CGE889journal_volume
72pub_type
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