BRCA1和BRCA2路径突变载体的断层揭示了乳腺癌发生的早期过程
Sara Oster Flayshman1, Osama Hidmi1, Jackelyn A Alva-Ornelas2
1The Concern Foundation Laboratories, The Lautenberg Center for Immunology and Cancer Research, Department of Immunology and Cancer Research-IMRIC, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem, Israel.
高风险个体的BRCA功能丧失导致关键癌症基因的DNA双链断裂 (DSB),类似于乳腺癌中的模式,影响早期癌症发生.
科学领域:
- 基因组学就是基因组学.
- 癌症生物学 癌症生物学
- 修复DNA修复DNA的修复
背景情况:
- 由于DNA双链断裂 (DSB) 的基因组不稳定性是癌症的标志.
- 关联DNA损伤与瘤发生的早期事件,特别是在高危人群中,仍然不清楚.
- DNA损伤反应 (DDR) 对于保持基因组完整性和预防癌症至关重要.
研究的目的:
- 描述同类重组 (HR) 损失对BRCA1/2突变载体癌症发病的影响.
- 在非恶性BRCA突变载体的原始细胞中识别和分析DNA双链断裂 (DSB).
- 将BRCA突变细胞中的DSB景观与健康的对照细胞和乳腺癌细胞进行比较.
主要方法:
- 下一代测序对DSB进行全面的基因组调查.
- 来自BRCA1/2突变载体和健康对照的初级乳腺上皮细胞的分析.
- 在BRCA突变细胞,健康细胞和乳腺癌细胞之间比较DSB模式.
主要成果:
- 在BRCA突变乳腺上皮细胞中,生理DSB的模式与健康对照细胞不同,类似于乳腺癌细胞的模式.
- 原型瘤基因和瘤抑制剂在BRCA突变样本中显示了增加的DSBs.
- 具有高DSB数量的基因通常表达高,在乳腺癌中经常发生突变,并且与HR修复途径相关.
结论:
- 由于改变了DSB景观,BRCA损失显著影响了早期致癌.
- 高风险的BRCA突变细胞中的"破坏体"反映了已确定的乳腺癌的"破坏体".
- 这些发现表明,在高风险人群中早期发现癌症的潜在途径.
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