Nat Genet:常见的遗传突变和可修正的危险因素是肥厚型心肌病易感性和表现度的基础

2021-02-02 xiaozeng MedSci原创

肥厚型心肌病(HCM)作为一种常见的严重遗传性心脏病,在每500人中的至少有1人受该病的影响,且存在着大量的医疗需求。

肥厚型心肌病(HCM)作为一种常见的严重遗传性心脏病,在每500人中的至少有1人受该病的影响,且存在着大量的医疗需求。HCM是成人早期和中期生命突然死亡、栓塞性中风和心力衰竭的主要原因。肌节基因中罕见的致病变异会引起HCM,然而,其特征是外显率低和表达能力可变,这也为患者的诊断和预后提出了挑战。

在更常见的肌小节阴性病例中,病例通常是孤立的,但在核心家庭中仍很常见,需要在家庭中进行临床的监测。为了研究常见的遗传变异对HCM发病风险的影响,研究人员对肥厚型心肌病注册中心(HCMR)招募的HCM患者进行了两项独立的多族裔病例对照全基因组关联研究(GWAS)。

HCM的全基因组关联分析研究设计示意图

在该全基因组关联研究中,研究人员共报告了2,780例病例和47,486例对照,研究确定了HCM的12个全基因组的显著易感基因座。单核苷酸多态性遗传率分析显示出了很强的多基因影响,特别是对于肌节蛋白阴性的HCM(64%的病例)。

孟德尔随机化分析确定可修正的HCM危险因素

在一项验证性研究中,遗传风险评分显示出了对HCM患病几率的重大影响,最低五分位数的几率减半,而最高五分位数的几率加倍,且还影响了肌节突变携带者的表型严重性。孟德尔随机化研究分析显示,舒张压(DBP)是肌节蛋白阴性HCM的关键且可修正的危险因素,DBP标准偏差的增加会使HCM的患病风险增加四倍。


总而言之,该研究结果显示,在HCM中常见突变和可修正的危险因素具有至关重要的作用,研究人员也建议将其应用到临床上。


原始出处:

Harper, A.R., Goel, A., Grace, C. et al. Common genetic variants and modifiable risk factors underpin hypertrophic cardiomyopathy susceptibility and expressivity. Nat Genet (25 January 2021).

 

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    2021-06-11 cy0324
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    2021-06-02 liye789132251
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    2022-01-18 canlab
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