基于贝叶斯点系统对遗传性癌症倾向基因变异分类的评估
Mohammad K Eldomery1, Jamie L Maciaszek1, Taylor Cain1
1Department of Pathology, St. Jude Children's Research Hospital, Memphis, TN.
概括
一个用于分类遗传变异的新点系统显著降低了遗传性癌症基因中不确定的意义变异 (VUS) 的比率. 该系统还允许有效分层VUS,改善遗传变异解释.
科学领域:
- 遗传学 是一个遗传学.
- 生物信息学是一种生物信息学.
- 临床诊断 临床诊断 临床诊断
背景情况:
- 精确的基因变异分类对于诊断遗传性疾病至关重要.
- 现有的指导方针,如美国医学遗传学和基因组学学院和分子病理学协会 (ACMG-AMP) 2015年指导方针,可能会导致高比例的不确定的意义 (VUS) 变异.
- 贝叶斯基于点的分类系统为更精确的变体分类提供了潜在的替代方案.
研究的目的:
- 为了比较ACMG-AMP 2015指南和贝叶斯点系系统之间的变异分类.
- 评估点数系统在115个遗传性癌症倾向基因内的变异分类中的实用性.
- 探索VUS.点系统的分级能力.
主要方法:
- 对721名儿科患者的生殖系变异分类的回顾性分析.
- 使用ACMG-AMP 2015指南和贝叶斯点制系统对变体的评估.
- 识别和比较两个系统之间的不一致的分类.
主要成果:
- 在2376个独特变异中,约有23.5%的变异显示出两种系统之间的分类不一致.
- 与ACMG-AMP 2015 (∼36%) 相比,积分系统导致VUS率较低 (∼15%)
- 积分系统有效地重新分类了具有单一良性证据的变体,并解决了冲突/修改的证据,并使VUS分为VUS-Low,VUS-Mid和VUS-High类别.
结论:
- 贝叶斯的以点为基础的系统有效地降低了VUS率,并提供了VUS分层的方法.
- 建议进行进一步的大规模研究,以评估积分系统对VUS报告和患者管理的临床影响.
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