解决短读测序错过的结构变异,揭示了它们的病原性
Caroline Schluth-Bolard1,2, Laïla El Khattabi3, Pierre-Antoine Rollat-Farnier4,5
1Service de Génétique, Institut Neuromyogène, CNRS UMR 5310, INSERM U1217, Unversité Lyon 1, Centre Hospitalier Universitaire de Lyon, Bron, France caroline.schluth-bolard@chru-strasbourg.fr.
Journal of medical genetics
|August 20, 2025
概括
短读基因组测序在重复区域中努力检测明显平衡的染色体重排 (ABCRs). 使用T2T-CHM13 V.2.0基因组和高级分析改善了断点分辨率,有助于患者诊断.
科学领域:
- 基因组学就是基因组学.
- 人类遗传学 人类遗传学
- 分子生物学分子生物学
背景情况:
- 简读基因组测序 (sr-GS) 对于表征明显平衡的染色体重排序 (ABCRs) 有效.
- 然而,sr-GS在9%-11%的ABCR病例中未能检测到断点.
- 这些未被发现的病例通常涉及复杂的基因组区域.
研究的目的:
- 调查sr-GS在检测ABCR断点方面的失败原因.
- 用先进的基因组分析改进ABCRs的检测和表征.
- 评估解决这些复杂的重组的临床影响.
主要方法:
- 在异常表型患者中研究了117个ABCR,重点关注标准sr-GS和GRCh38对齐无法检测的14个.
- 将测序数据与T2T-CHM13 V.2.0参考基因组重新对齐,并使用多个结构变异 (SV) 调用器.
- 利用诸如FISH,链接读取,长读取测序和光学基因组映射等补充方法进行进一步的表征.
主要成果:
- 在12个转位的基对水平上成功表征了以前无法通过sr-GS检测到的断点.
- 确定每个转移中的至少一个断点涉及高度重复的元素 (例如,α卫星,细分重复).
- 确定在50%的病例中,解决的断点通过基因破坏或位置效应解释了患者的表型.
结论:
- 在检测ABCR中sr-GS的失败归因于高度重复的基因组区域内的断点.
- T2T-CHM13 V.2.0参考基因组和先进的SV调用器可以提高复杂重排的分辨率.
- 对ABCRs的准确表征对于诊断致病变体和告知患者护理至关重要.
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