圆形外染色体DNA促进高风险脑髓母细胞瘤的瘤异质性
Owen S Chapman1,2,3, Jens Luebeck1,4, Sunita Sridhar2,5
1Bioinformatics and Systems Biology Graduate Program, University of California San Diego, San Diego, CA, USA.
Nature genetics
|November 9, 2023
概括
循环外染色体DNA (ecDNA) 通过改变基因表达和抵抗来驱动癌症. 在脑髓母细胞瘤中检测到ecDNA显示,它显著增加了患者的复发和死亡风险.
科学领域:
- 在瘤学瘤学.
- 遗传学 遗传学是一种遗传学.
- 计算生物学 计算生物学
背景情况:
- 循环外染色体DNA (ecDNA) 与癌症的进展,耐药性和患者的不良结果有关.
- 了解ecDNA在特定儿科癌症 (如脑髓母细胞瘤) 中的作用,对于开发向疗法至关重要.
研究的目的:
- 调查脑髓母细胞瘤中ecDNA的患病率和特征.
- 确定ecDNA与患者结局 (包括复发和生存) 之间的关联.
- 探索ecDNA结构的多样性及其在脑髓母细胞瘤中的功能影响.
主要方法:
- 使用计算方法检测和重建ecDNA的481个脑髓母细胞瘤的回顾性分析.
- 在脑髓母细胞瘤模型中进行多模式测序,成像和CRISPR抑制实验.
- 通过分子子组对ecDNA发现的分层分层.
主要成果:
- 在18% (82/465) 的脑髓母细胞瘤患者中发现了循环性ecDNA.
- 患有ecDNA阳性瘤的患者的复发风险增加了2倍以上,在5年内死亡风险增加了3倍.
- 观察到具有明显放大瘤基因的多个ecDNA基因系,以及副本数异质性和增强器重新连接事件.
结论:
- EcDNA是脑髓母细胞瘤中常见和多样化的特征,与患者预后明显恶化有关.
- 在ecDNA拷贝数和增强剂重新连接中的瘤内异质性代表了关键的致癌机制.
- 这些发现突出了ecDNA作为治疗干预脑髓母细胞瘤的关键目标.
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