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Admixture-driven structural variation diversity and its functional implications

delete2025-11-21
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OA
AI
H
Haiyi Lou
王宜敏 封面图
王宜敏 (Yimin Wang)
Y
Yu Chai
Z
Zhilin Ning
R
Ruiqing Fu
陆
陆燕 (Yan Lü)
B
Bo Xie
S
Sen Ma
Y
Yuwen Pan
Y
Yang Gao
D
Dongsheng Lu
X
Xinyue Bai
Y
Yajun Yang
D
Dolikun Mamatyusupu
徐
徐书华 (Shuhua Xu) *
DOI:10.1093/nsr/nwaf527delete
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摘要

摘要

En 中文
人群混合是一种强大的进化力量塑造基因组多样性,但其对结构变异(SV)的动态和功能后果的影响仍 poorly understood。这里,我们展示了一个全面的基因组测序分析,针对维吾尔族人群中的SVs,这是一个具有独特西方和东方祖先贡献的混合欧亚人群模型。我们鉴定了9965个高置信度SVs,揭示维吾尔族表现出32%的新颖SVs和比祖先来源人群高1.19倍的SV-转录多样性。关键的是,SV多样性遵循与祖先比例的非线性抛物线关系(r = 0.94),在西方/东方祖先贡献平衡时达到峰值。混合诱导的祖先接合处的重组通过非等位同源重组(NAHR)创建SV热点,其中60%的后混合SVs被同源重复序列包围。祖先分歧的SVs不成比例地调节基因表达,而混合变异组合(例如HLA-B和FOXO6位点)通过累加调控效应破坏免疫/代谢通路。值得注意的是,虽然维吾尔族携带升高的SV多样性,但致病性变异的负担与祖先人群相当,表明存在缓冲遗传负荷的机制。进化上,年轻的SVs倾向于尺寸更大,产生更强的调控影响,并表现出更高的预测致病性。这些发现确立了混合作为基因组多样化和功能平衡的双重力量,将进化动力学与生物医学见解联系起来。我们的工作强调了在遗传医学中采用SV感知方法的重要性,并强调了混合人群如何通过新颖变异组合扩展基因组多样性,超越祖先边界。
Keyword:
Structural variation
Population admixture
Genomic diversity
Functional consequences
Non-allelic homologous recombination
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