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人类基因组包含广泛分布的,独有的阴阳单质类型
1UCL Genetics Institute, UCL, Darwin Building, Gower Street, London, WC1E 6BT, UK. d.curtis@ucl.ac.uk.
European journal of human genetics : EJHG
|June 12, 2023
概括
研究人员确定了超过5000个独有的阴阳单体,长DNA序列具有明显的遗传变异,覆盖2%的人类基因组. 它们的进化起源和功能在很大程度上是未知的.
科学领域:
- 人类遗传学 人类遗传学
- 人口基因组学 人口基因组学
- 进化生物学 进化生物学
背景情况:
- 独家的阴阳单质,在每个位点都不同,有传说性报道.
- 人类基因组中对这些复杂的遗传结构进行系统的搜索是缺乏的.
研究的目的:
- 在一个大型的人类基因组数据集中系统地搜索和表征独特的阴阳单元型.
- 调查全球分布,祖先的起源,以及这些类型与基因和表型的潜在关联.
主要方法:
- 在1000个基因组项目中利用了来自2504个无关联个体的未分相全基因组序列数据.
- 制定了识别单核酸多态 (SNP) 链的标准,其全球小等位基频率 (MAF) >0.1,完整的链接不平衡,以及相邻SNP之间的最小物理距离.
- 排除了通过高异位呼叫识别的重复序列.
主要成果:
- 鉴定了5114个独有的阴阳单基因型,平均34.8个SNP,跨越15.7kb,累计覆盖了人类基因组的80 Mb.
- 观察到一些单元类型的MAF的种群特异变化,但整体的全球固定指数与单个SNP可比.
- 在黑猩猩和/或尼安德特人基因组中发现了大多数哈普洛类型的部分形式,表明逐渐形成,但现代人类中缺少中间形式.
结论:
- 独有的阴阳单体构成了人类基因组的2%以上,形成和保存机制不明.
- 这些单元类型可以作为追踪染色体区域在人类历史上分散的有价值的标志物.
- 需要进一步的研究来阐明这些独特的基因组结构的进化意义和功能作用.
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