Blood:双胞胎间的克隆造血遗传倾向对比

2019-10-27 QQY MedSci原创

潜能不明确(CHIP)的克隆造血(CH)是由髓系癌相关基因突变定义的,等位基因突变频率至少达到2%。近期研究表明,CH可能具有遗传易感性。

中心点:

在一个594对老年双胞胎的队列中没有发现克隆造血的遗传倾向

通过直接比较不一致的双胞胎发现CHIP突变与死亡率无关

摘要:

潜能不明确(CHIP)的克隆造血(CH)是由髓系癌相关基因突变定义的,等位基因突变频率至少达到2%。近期研究表明,CH可能具有遗传易感性。

为进一步探究这种现象,研究人员开展一以人群为基础的研究,纳入299对双胞胎的594人(73-94岁),均随访超过20年。研究人员使用自定义的21个基因panel对外周血中的DNA进行测序,中位覆盖率为6179X。以突变的病例一致性率来评估遗传易感性。

从214人(36%)中发现了突变。有20对双胞胎在相同基因上携带突变,而相同基因相同位点的突变仅见于两对双胞胎。同卵双胞胎和异卵双胞胎的病例一致性在任何特定基因、亚群或CHIP突变总体上均未发现任何显著差异,也未检测到显著的遗传倾向。

对于CHIP突变的不一致性,研究人员假设如果双胞胎中受影响的个体比未受影响的个体死的早,可作为具有CH的直接指标。经分析显示共有127对双胞胎携带的突变不一致,仅61对(48%)双胞胎中的受影响个体比未受影响个体死的早(p=0.72)。

总体上,本研究并未发现CHIP突变的遗传易感性。CHIP突变不一致的双胞胎之间的直接对比不能证实既往研究所报道的CHIP突变与存活呈负性相关性。

原始出处:

Jakob Werner Hansen, et al.Clonal hematopoiesis in elderly twins: concordance, discordance and mortality.Blood.2019001793. https://doi.org/10.1182/blood.2019001793

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    2020-08-28 aids221
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    2019-10-29 俅侠
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