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Updated: Jul 5, 2025

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绘制人类特异性缺失的cis-和trans-调节性向基因的映射

Tyler Fair^1,2,3, Bryan J Pavlovic^1,3, Dani Swope^1,3

¹Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, CA, USA.

bioRxiv : the preprint server for biology

|January 18, 2024

概括

人类特异性删除 (hDels) 对进化至关重要. 这项研究使用了CRISPR干扰查来发现影响细胞增殖和基因表达的大型hDels,揭示了它们在人类基因组中的功能作用.

科学领域:

基因组学就是基因组学.
进化生物学进化生物学
分子生物学分子生物学

背景情况:

序列删除是分子进化的基本机制.
数以千计的人类特异性删除 (hDels) 已被确定,但在大型hDels (≥50个基对) 在其原生基因组环境中的功能尚不清楚.
之前的研究评估了短hDels (≤31个基对) 的cis-regulatory潜力,使用记者测试.

研究的目的:

系统地识别影响细胞增殖和基因表达的大型人类特异性缺失 (hDels).
探索hDels在其原生基因组环境中的cis和跨调节作用.
建立一个框架,用于对人类特异性遗传变异的功能性调查.

主要方法:

设计了基因组规模的单向导RNA库,针对6,358 hDels的7.2 Mb的序列.
在黑猩猩多能干细胞中采用系统的CRISPR干扰 (CRISPRi) 选方法.
整合了hDel数据与染色体状态特征,并利用单细胞CRISPRi (Perturb-seq) 来识别调控标基因.

主要成果:

确定了20个hDel,可以显著控制基因表达.
发现两个hDel,hDel_2247和hDel_585,在大脑中表现出组织特异性活性.
证明大型hDels可以修改细胞增殖和基因调节.

结论:

大量的人类特异性删除在分子和细胞过程中起着重要作用.
这项研究为研究人类特异性遗传变异提供了一个功能性框架.
这些发现强调了删除序列在人类进化和细胞功能中的重要性.

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