法医学中使用的微卫星位于富含特征相关变异的区域
Vivian Link1, Yuómi Jhony A Zavaleta2, Rochelle-Jan Reyes2
1Department of Quantitative and Computational Biology, University of Southern California, Los Angeles, CA, USA.
iScience
|October 16, 2023
概括
法医遗传学使用组合DNA索引系统 (CODIS) 短串重复 (STR) 位点. 这些区域,与人们普遍认为的相反,富含与特征和疾病相关的遗传变异.
科学领域:
- 法医遗传学 法医遗传学
- 人类遗传学 人类遗传学
- 基因组关联研究 基因组关联研究
背景情况:
- 结合DNA索引系统 (CODIS) 中的20个短串重复 (STR) 位点是美国法医遗传学的基础.
- 一个常见的假设是,CODIS loci提供了关于祖先或表型特征的最小信息.
- 最近的进展揭示了许多基因型特征关联,挑战了这一假设.
研究的目的:
- 与非CODIS STR相比,调查CODIS STR位点相邻的区域中基因型特征关联的流行率.
- 评估CODIS位置区域是否为致病变体和特征相关单核酸多态 (SNP) 富含.
主要方法:
- 在CODIS和非CODIS短串重复 (STR) 位置周围对遗传关联景观进行了调查.
- 对比了CODIS STRs相对于随机STR集的侧边区域 (10kb和100kb) 的已知致病变体和全基因组关联研究 (GWAS) 识别的特征关联SNP的丰富.
主要成果:
- 该研究发现,CODIS位点周围的区域对特征相关的SNP具有显著的丰富性.
- 与CODIS loci相邻的区域显示出已知致病变体 (上>90百分位) 和特征相关SNP (上>95百分位在10kb和100kb区域) 的更高流行率.
- 这种丰富性与随机组的自体四核酸重复性STR相比观察到.
结论:
- 与CODIS loci相关的遗传区域出乎意料地富含与人类特征和疾病相关的变异.
- 这些发现表明,CODIS基因型可能包含比以前假设的更多的表型信息,这需要进一步调查.
- 在CODIS loci周围的致病变体和特征相关SNP的丰富凸显了在法医和遗传研究中需要仔细考虑的需要.
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