在冰岛对与QTc间隔相关的罕见编码变体进行查
Gardar Sveinbjornsson1, Bara D Benediktsdottir2, Gunnlaugur Sigfusson3
1deCODE Genetics/Amgen, Inc. Reykjavik Iceland.
Journal of the American Heart Association
|July 14, 2023
概括
长QT综合征 (LQTS) 的遗传变异比以前认为的更为常见,其中一些与严重的心脏事件有关. 了解变异影响有助于更好地评估长QT综合征患者的风险和临床管理.
科学领域:
- 心血管遗传学 心血管遗传学
- 人类遗传学 人类遗传学
- 分子心脏病学分子心脏病学
背景情况:
- 长QT综合征 (LQTS) 是一种与心脏突然心脏死亡相关的心脏再极化障碍.
- 在KCNQ1,KCNH2和SCN5A中的致病变体是LQTS的主要原因.
- 关于LQTS流行病学,变种表达力和透度的数据有限.
研究的目的:
- 为了选与冰岛修正的QT (QTc) 间隔相关的罕见编码变异.
- 调查已识别的变种的频率,透率和与严重事件的关联.
- 提高对LQTS遗传基础和临床影响的理解.
主要方法:
- 查影响QTc间隔的罕见编码变异在冰岛队列中.
- 对变异频率,透率和与严重临床结果相关性的分析.
- 统计关联测试 QTc 间隔延长和心脏突然死亡.
主要成果:
- 确定了与QTc间隔相关的12种变异,包括KCNQ1,KCNH2,MYBPC3,PKP2,ISOC1和MYOM2.
- 已知的LQTS基因中8种变异的组合载体频率为1:190.
- KCNQ1变体p.Tyr315Cys和p.Leu273Phe显示强烈的QTc延长和p.Leu273Phe与心脏突然死亡相关;p.Val215Met具有较小的QTc效应和没有严重事件关联.
结论:
- 与LQTS相关的变异的载体频率高于此前估计的.
- 已识别的变体表现出可变的表达性,影响QTc间隔和临床严重程度.
- 研究结果支持改善QTc延长的识别,风险分层和个性化临床管理.
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