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462个影响DNA结合域的生殖系BRCA2误解变异的功能分析和临床分类

Chunling Hu¹, Huaizhi Huang¹, Jie Na²

¹Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55902, USA.

American journal of human genetics

|February 28, 2024

概括

在DNA结合域 (DBD) 中对BRCA2误解变异的功能评估显著改善了变异分类. 这项研究增强了对遗传性癌症风险和不确定的BRCA2变异 (VUSs) 患者的临床管理的理解.

科学领域:

遗传学和基因组学遗传学和基因组学
分子生物学分子生物学
癌症研究癌症研究

背景情况:

在遗传性癌症遗传检测中,BRCA2的不确定意义的变异 (VUS) 是常见的.
大多数致病性BRCA2误解变体位于C端DNA结合域 (DBD).
准确的BRCA2VUS分类对于临床管理和风险评估至关重要.

研究的目的:

功能性地评估DBD中462个BRCA2误解变异对DNA修复活动的影响.
将功能性检测结果与in silico预测和现有的分类框架进行比较.
提高BRCA2误解VUS的分类产量,以获得更好的临床效用.

主要方法:

利用同质导向的DNA双链断裂修复试验来评估462个BRCA2 DBD误解变异的功能.
将功能数据与基于序列的in silico预测模型进行比较.
将功能结果与临床和遗传数据集成到类似ACMG/AMP的分类框架中.

主要成果:

462种变体中有137种功能异常,313种正常,12种显示中等功能.
功能性检测表明与其他功能性研究的高相关性,并提高了分类收益率至97.5%.
功能异常的致病变体显示,与蛋白质截断变体 (OR 8.56) 相比,乳腺癌风险较低 (OR 5.15).

结论:

使用经过验证的试验对BRCA2变异的功能研究大大提高了ACMG/AMP模型的分类准确性.
预计这种方法将改善患有生殖线BRCA2错误VUSs的个体的临床管理.
功能性评估为精确评估遗传性癌症综合征风险提供了关键数据.

关键词:

这就是BRCA2的原因.这就是HDR HDR.这就是VUS VUS VUS.癌症癌症癌症癌症癌症倾向性基因倾向性基因变种分类的变种分类.

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