非综合征型聋患者及家庭成员耳聋基因MYO15A检测及其产前诊断意义

MYO15A Gene Mutation Analysis for Two Nonsyndromic Sensorineural Hearing Loss Families and Their Prenatal Diagnosis

柴福;赵海亮;李胜;林晋业;魏建芳;邱书奇;

1:深圳市龙岗区耳鼻咽喉医院

2:深圳市耳鼻咽喉研究所

3:深圳市耳鼻咽喉重点实验室

摘要
目的分析2例汉族非综合征型聋(nonsyndromic sensorineural hearingloss,NSHL)患者及家庭成员中耳聋基因MYO15A的突变位点,探讨MYO15A基因检测用于产前诊断的可行性。方法采集2例汉族非综合征型感音神经性聋患儿(均为男性,年龄分别为2岁8个月和3岁6个月)及两个家庭(编号为NSHL-01和NSHL-02)成员血样并记录临床资料。应用芯片捕获高通量测序(targeted genomic capturing and next-generation sequencing,targeted DNA-Hiseq)对2例NSHL患儿进行127个耳聋基因检测,获得变异序列后,针对所检出变异序列对家庭成员和健康对照个体的MYO15A基因序列进行变异验证分析,确定致病性突变后,使用sanger测序法对NSHL-02家庭中的高危胎儿进行孕中期产前诊断。结果在NSHL-01家庭的患儿中检测出MYO15A基因复合杂合突变,即:内含子18亚区c.5134-1G>A(p.-)杂合突变和外显子20亚区c.5324A>C(p.Gln1775Pro)杂合突变,本地收集的200例正常测序样本中无关于此SNP的频率信息;患儿的父亲携带c.5134-1G>A杂合突变,而患儿的母亲携带c.5324A>C杂合突变。在NSHL-02家庭的患儿检出MYO15A基因复合杂合突变,第二外显子c.374delG(Arg125ArgfsX319)杂合突变和外显子56亚区c.9358C>T(p.Gln3120Ter)杂合突变,本地收集的200例正常测序样本中无关于此SNP的频率信息;患儿的父亲携带c.9358C>T杂合突变,而患儿的母亲携带c.374delG杂合突变;该家庭高危胎儿携带c.9358C>T杂合突变,不携带c.374delG杂合突变,出生后表型正常。结论 MYO15A基因内含子18亚区c.5134-1G>A杂合突变和外显子20c.5324A>C杂合突变,及第二外显子c.374delG杂合突变和外显子56亚区c.9358C>T杂合突变是2个NSHL家庭的致病原因,芯片捕获高通量测序及数据分析技术可对2个NSHL家庭进行有效的基因诊断,结合sanger技术可进行产前诊断。
关键词
非综合征型感音神经性聋;MYO15A基因;产前诊断
基金项目(Foundation):
深圳市科技研发资金(No.JCYJ20170302165836389)资助
作者
柴福;赵海亮;李胜;林晋业;魏建芳;邱书奇;
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