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J Hum Genet:俄罗斯GJB2/DFNB1突变谱更新:一个奠基性印古什人缺失突变(GJB2-D13S175)在其他大缺失突变中是频率更高的

2017-04-18 AlexYang MedSci原创

尽管GJB2基因序列的突变位点组成了变异的大多数数据,这些变异可以引起常染色体隐性非综合征听力损失,但是几乎没有报道过大的缺失突变导致DFNB1耳聋。目前,DFNB1听力损失的遗传检测包括了GJB2测序和DFNB1缺失分析,从而来检测两个常见的大缺失,包括del(GJB6-D13S1830) 和 del(GJB6-D13S1854)。最近,研究人员报道了他们最近鉴定的del(GJB2-D13S17

尽管GJB2基因序列的突变位点组成了变异的大多数数据,这些变异可以引起常染色体隐性非综合征听力损失,但是几乎没有报道过大的缺失突变导致DFNB1耳聋。目前,DFNB1听力损失的遗传检测包括了GJB2测序和DFNB1缺失分析,从而来检测两个常见的大缺失,包括del(GJB6-D13S1830) 和 del(GJB6-D13S1854)。

最近,研究人员报道了他们最近鉴定的del(GJB2-D13S175),即101kb缺失,在俄罗斯人口中的频率、临床意义和进化起源。研究人员发现,在1104位无关听力损失的病人多民族群体,且在在DFNB1位点出现等位基因突变的研究群体中,del(GJB2-D13S175)等位基因频率高达0.5%(11/ 2208),并且该等位基因明显的与重度感音神经性耳聋有关。另外,研究人员还对8个之前未报道的GJB2突变位点进行了描述。研究人员还发现,所有携带del(GJB2-D13S175)的病人祖先为印古什人。在听力正常个体中,del(GJB2-D13S175)在俄罗斯共和国的印古什共和国中携带率大约为1%(2/241)。另外,对缺失相关的单倍型分析表明了一个普遍的印古什人遗传起源现象,即该缺失具有大约3000年的进化历史。研究人员最后指出,由于del(GJB2-D13S175)被标准化的GJB2分析方法遗漏,因此,del(GJB2-D13S175)检测增加了人们对DFNB1听力损失的检测策略。

原始出处:

Elena A Bliznetz, Maria R Lalayants, Tatiana G Markova et al. Update of the GJB2/DFNB1 mutation spectrum in Russia: a founder Ingush mutation del(GJB2-D13S175) is the most frequent among other large deletions. J Hum Genet. 13 April 2017. doi:10.1038/jhg.2017.42

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    2017-06-25 小刀医生
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    2018-02-07 canlab
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    2017-08-19 cy0324
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