巴德1的和基因组编辑解决了VUS,并提供了对BRCA1-BARD1瘤抑制的洞察力
Ivan Woo1, Silvia Casadei1,2, Matthew W Snyder1
1Brotman Baty Institute for Precision Medicine, Seattle, WA, USA.
medRxiv : the preprint server for health sciences
|November 24, 2025
概括
和基因组编辑在BARD1中发现了功能丧失变体,这是一种与遗传性乳腺癌相关的基因. 这种方法解决了不确定的意义的变异,改善了癌症风险评估和治疗决策.
科学领域:
- 遗传学和基因组学 遗传学和基因组学
- 癌症生物学 癌症生物学
- 分子诊断学 分子诊断
背景情况:
- 生殖系BARD1变异与遗传性乳腺癌和神经母细胞瘤有关.
- 在BARD1中,很大一部分 (98%) 的误解变异被归类为具有不确定的意义的变异 (VUS),限制了临床解释.
- 了解BARD1变异的功能影响对于评估癌症倾向至关重要.
研究的目的:
- 使用和基因组编辑 (SGE) 综合评估BARD1基因中的误解变异和小删除的功能影响.
- 确定功能丧失 (LoF) 变异的比例及其在BARD1域内的分布.
- 评估SGE在分类VUS和告知遗传癌症风险方面的临床实用性.
主要方法:
- 应用和基因组编辑 (SGE) 用于系统地分析BARD1.1.中的8,818个单核酸变体 (SNV) 和2,097个3个基对删除.
- 评估了这些变异对细胞存活率和RNA丰度的影响.
- 利用高通量选来区分RNA水平与蛋白质功能的变异影响.
主要成果:
- 确定了13%的误解变异是功能丧失 (LoF),其中98%位于BARD1的三个折叠域.
- 在乳腺癌患者队列中,在脚重复和BRCT域中发现了LoF误解变异的丰富.
- 在区分致病性和良性变体方面,SGE表现出高准确性 (AUC = 0.99),并解决了95.4%的VUS.
- 从蛋白质功能的影响对RNA丰度的差异化变异效应,提供了关于BARD1在同质导向修复中的瘤抑制作用的见解.
结论:
- SGE是功能变体分类的强大工具,可以显著提高BARD1.1中不确定的意义变体 (VUS) 的分辨率.
- 特定BARD1域中的LoF变异与乳腺癌风险增加有关,突出显示了它们的功能相关性.
- 由此产生的关于BARD1变体影响的综合数据集对遗传性癌症风险评估和指导治疗策略具有直接的临床实用性.
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