小型多态是结构变体中祖先偏差的一个来源
Peter A Audano1, Christine R Beck2,3
1The Jackson Laboratory for Genomic Medicine, Farmington, Connecticut 06032, USA.
Genome research
|January 4, 2024
概括
结构变异 (SV) 断点显示了由于技术偏差而导致的样本间不一致,而不仅仅是序列准确性. 祖先和断点同质性显著影响SV调用,影响大约5%的人类基因组变异.
科学领域:
- 基因组学就是基因组学.
- 生物信息学是一种生物信息学.
- 人类遗传学 人类遗传学
背景情况:
- 基因组组装和算法的进步改善了结构变异 (SV) 检测和断点精度.
- 然而,系统偏差仍然存在,导致不同样本和分析中不一致的SV断点位置.
研究的目的:
- 在样本中调查不一致的SV断点位置的原因.
- 识别导致 SV 断点变化的因素及其对变异代表性的影响.
主要方法:
- 从长时间阅读组件 (人类基因组结构变异联盟) 中重新分析了64个分阶段的单元类型.
- 识别了具有可变断点的SV插入和删除,与并联重复或细分重复无关.
- 评估了从对齐测序读取,序列准确性,祖先,断点同质性和图谱基因组方法调用 SV 对断点一致性的影响.
主要成果:
- 确定了882个可变的SV插入和180个删除,具有不一致的断点.
- 来自对齐的SV调用读数增加了断点分歧的2-16倍.
- 祖先和断点同质性显著影响了断点的准确性,特别是在并联重复的情况下.
- 图谱基因组方法虽然使SV调用正常化,但引入了其他技术偏差.
结论:
- SV断点不一致影响大约5%的人类基因组中的SVs.
- 这些不一致,受祖先和同类学的影响,影响变体解释和注释.
- 需要进一步开发算法来改进 SV 数据库,减轻祖先效应,并增强用于断点分析的变量调用集.
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