以动机为中心的分析揭示了在人体中运行的通用和组织特异性突变机制
bioRxiv : the preprint server for biology
|February 27, 2026
概括
身体突变发生在正常人体细胞中,时钟式的去胺和环氧化物暴露有助于组织间的突变发生. 紫外线辐射会改变皮肤,而APOBEC酶会影响膀和肺等器官.
科学领域:
- 基因组学就是基因组学.
- 癌症研究 癌症研究
- 分子生物学分子生物学
背景情况:
- 身体突变对人类基因组进化和癌症发展至关重要.
- 了解正常,非癌细胞的基线突变发生至关重要,但仍有很少的特征.
研究的目的:
- 分析大量正常人体组织中的突变特征,以确定正在进行的突变性过程.
- 建立一个强大的框架,用于检测和归因健康组织体质突变的来源.
主要方法:
- 分析了来自25个组织的11,949个正常样本的全基因组和全外基因组测序数据.
- 应用统计假设测试和最小突变负载估计 (MEML) 来检测丰富的三核酸基因.
- 在健康和非癌症的患病组织之间对突变模式的比较.
主要成果:
- 鉴定了与癌症相关的突变动机,包括类似时钟的C→T (nCg) 和T→C (aTn) 替代,存在于各种正常组织中.
- 紫外线相关的突变发生 (yCn,nTt) 仅在皮肤样本中检测到.
- 在膀,肺,肝脏,乳腺和小肠中,APOBEC诱导的突变 (tCw中的C→T,C→G) 丰富,偏好APOBEC3A.
- 与健康组织相比,患病的非癌症组织显示出更高的aTn和nCg动机的积累,不依年龄.
结论:
- 阐明了在正常人组织中发生的几种活性突变性过程.
- 提供了一种经过验证的分析框架,用于从体质突变数据中识别突变性特征.
- 在健康和患病的非癌性组织之间突出突变积累的差异.
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