Nat Commun:中东卡塔尔人群的全基因组关联研究揭示45种临床相关性状的遗传关联性

2021-03-05 xiaozeng MedSci原创

全基因组关联研究(GWAS)为许多临床相关性状的遗传决定因素提供了新见识,通过该研究技术已鉴定出了数千种与疾病或性状相关的遗传突变体。

全基因组关联研究(GWAS)为许多临床相关性状的遗传决定因素提供了新见识,通过该研究技术已鉴定出了数千种与疾病或性状相关的遗传突变体。然而,迄今为止的大多数已发表的GWAS研究均来自欧洲或东亚人群,中东人群中的相关研究代表性不足。

由于迄今为止,所有进行的GWAS研究都使用了基于基因组测序数据推算出来的基因组分型阵列,在这些研究中,只有很少的中东基因组存在,因此错过了该群体的特异性信号。

此外,许多与性状相关的突变体在人群中的等位基因频率和效应大小存在着差异,这可能会使多基因评分的推导复杂化。尽管临床实验室测试在医疗决策中起着举足轻重的作用,但目前对于其在种群之间的遗传突变状态仍知之甚少。


在该研究中,研究人员报告了一个全基因组关联研究,该研究通过分析卡塔尔人群中的45个临床相关性状,对6218个个体采用了全基因组测序方法,并在7768个受试者中进行了验证。

45个临床相关性状的遗传力评估

研究人员发现,相比于与非洲人群,卡塔尔人群与欧洲人群之间的性状遗传力更相似。研究人员在全基因组范围内鉴定了281个突变与性状显著关联。这些位点的等位基因频率表现出了与欧洲人群更高的相关性,相比于日本人群和非洲人群。


进一步的研究显示,相比于先前的报告,连锁不平衡模式和相关位点的效应大小存在着差异。研究人员还报告了17种新型的卡塔尔人群优势标志,也为研究调节相关性状的生物学通路提供了一定的理论基础。

45个临床相关性状的GWAS曼哈顿图

总而言之,欧洲人群衍生的多基因评分(PGS)降低了卡塔尔人群的预测性能,这可能对人群之间PGS分析及其在精密医学中的未来应用产生一定的影响。


原始出处:

Thareja, G., Al-Sarraj, Y., Belkadi, A. et al. Whole genome sequencing in the Middle Eastern Qatari population identifies genetic associations with 45 clinically relevant traits. Nat Commun 12, 1250 (23 February 2021).

 

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    2021-09-26 liuli5079
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