A novel nonsense mutation in BBS4 gene identified in a Chinese family with Bardet-Biedl syndrome.

Abstract:

BACKGROUND:Bardet-Biedl syndrome (BBS) is a genetically heterogeneous disease, and information about BBS in Chinese populations is very limited. The purpose of the present study was to determine the genetic cause of BBS in a Chinese Han family. METHODS:Clinical data were recorded for the 4-year-old female proband and the available family members. The proband was screened for mutation by Sanger sequencing for a total of 142 exons of the 12 BBS-causing genes (BBS1-BBS12). The variants detected in the proband were further confirmed in the other family members. RESULTS:We identified a novel homozygous nonsense mutation (c.70A>T, p.K24X) in the BBS4 gene exon 2 in the proband. Such mutant allele was predicted to cause a premature truncation in the N-terminal of the BBS4 protein, and probably induced the nonsense-mediated decay of BBS4 messenger RNAs. The proband's parents and brother were heterozygous for the nonsense mutant allele. It was absent in 50 Chinese control subjects. An additional rare heterozygous missense single nucleotide polymorphism (SNP) named rs200718870 in BBS10 gene was also detected in the proband, her father and her brother. Some manifestations of the proband including atypical retinitis pigmentosa, choroidal sclerosis, high myopia, and early onset of obesity might be associated with this mutation in BBS4 gene. The proband's father also reported surgical removal of an extra finger during childhood. CONCLUSIONS:The present study described a novel nonsense mutation in BBS4 gene in a Chinese family. This homozygous mutation was predicted to completely abolish the synthesis of the BBS4 protein. We also detected a rare heterozygous missense SNP in BBS10 gene in the family, but did not find sufficient evidence to support the triallelic inheritance.

journal_name

Chin Med J (Engl)

journal_title

Chinese medical journal

authors

Li Q,Zhang Y,Jia L,Peng X

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

4190-6

issue

24

eissn

0366-6999

issn

2542-5641

journal_volume

127

pub_type

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