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6,888个RAD51D变体的高通量映射识别了同源重组和olaparib反应所需的独特生物化学功能
bioRxiv : the preprint server for biology
|January 16, 2026
概括
RAD51D变异与癌症有关,但许多变异的意义尚不清楚. 一项新的测试测试了6,888种变异,创建了一个区分有害与良性突变的地图,并揭示了它们如何影响DNA修复.
科学领域:
- 遗传学和基因组学 在
- 癌症生物学 癌症生物学
- 分子生物学分子生物学
背景情况:
- 瘤抑制剂RAD51D对于同源重组 (HR) 是关键的DNA修复途径至关重要.
- RAD51D的致病变体与乳腺癌和卵巢癌的风险增加有关.
- 在RAD51D中,许多误解变异缺乏明确的临床意义,阻碍了准确的风险评估.
研究的目的:
- 系统地评估6888个RAD51D编码变体的功能影响,使用多重变体效应测试 (MAVE).
- 为RAD51D开发一个全面的变体到功能地图,以帮助分类临床变体.
- 阐明RAD51D变体破坏其在DNA修复中的功能的分子机制.
主要方法:
- 功能效应的多重测定 (MAVE) 用于测试6888个RAD51D编码变体的功能丧失,评估olaparib敏感性.
- 在70个临床变异中,用于验证MAVE结果的正对称同源重组 (HR) 和生物化学测试.
- 结构和机制分析的重点是BCDX2复合体内的RAD51D-RAD51C相互作用及其ATPase活性.
主要成果:
- MAVE成功生成了一个变体到功能地图,可以准确区分已知的致病性和良性RAD51D变体.
- 发现DNA结合或ATPase核心区域内的变异最严重损害HR.
- 在BCDX2复合体中的RAD51D-RAD51C接口对于调节RAD51D的ATPase活性至关重要,这表明它在控制DNA修复时间方面发挥了作用.
结论:
- 这项研究提供了RAD51D变体的高分辨率功能地图,显著改善了未知意义的变体的分类.
- 研究结果显示,RAD51D的主要作用可能是调节BCDX2复合体的ATPase活性,确保高效的RAD51导线组装.
- 识别有害变异的热点并了解它们的致病性机制的基础,为RAD51D在癌症中的作用提供了新的见解.
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