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心电图在长QT综合征家系调查及基因筛查中的意义

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摘要 目的探讨心电图在长QT综合征家系调查及基因筛查中的意义。方法根据心电图确定riO,床确诊的长QT综合征2型的先证者及2个父系家庭成员突变的可能来源,然后用PCR法扩增先证者及家系成员的引起长QT综合征2型相关基因HERG的15个外显子,并对HERG基因外显子的PCR产物直接测序。结果心电图筛查的F1家系中3位患者携带19个碱基缺失的HERG突变基因,突变基因来源于父系;另一个家系F2的先证者存在A561V的HERG基因突变.先证者父母存在HERG基因G1692A的单核苷酸多态性,A561V突变可能直接来源于先证者。F3家系中在KCNH2基圆第6外显子.第1387个核苷酸T变为C导致编码苯丙氨酸残基的第463密码子TTC突变成为亮氨酸残基的密码子CTC。这一个新的错义突变F463L,位于于KCNH2通道跨膜片段S2上。 此家系中先证者的哥哥及其儿子也是该突变的携带者。结论心电图对确定家系调查和基因筛查的方向有重要的价值。
出处 《医学信息》 2011年第23期268-269,共2页 Journal of Medical Information
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参考文献12

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