在单细胞水平的子宫内膜癌分子亚型中,PI3K通路基因突变的演变和同时发生
Arnaud Da Cruz Paula1, Yingjie Zhu2, David N Brown3
1i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Porto, Porto, Portugal.
概括
胚胎内膜癌 (EECs) 呈现出明显的PI3K路径突变演变. NSMP EEC 的演变是线性的,而 MMRd/POLE EEC 的演变是趋同的,影响了潜在的疗法.
科学领域:
- 癌症学
- 基因组学
- 分子生物学
背景情况:
- 在子宫内膜癌 (EECs) 中,PI3K通路经常发生变化,通常具有多个同时发生的突变.
- 单剂PI3K抑制剂的有限治疗成功表明复杂的进化机制.
研究的目的:
- 研究不同分子亚型中同时发生的PTEN,PIK3CA和PIK3R1突变的进化轨迹.
- 通过单细胞测序确定这些突变是否通过线性或融合进化产生的.
主要方法:
- 从无特定分子样本 (NSMP),不匹配修复缺陷 (MMRd) 和POLE亚型中对50009个细胞进行单核DNA测序.
- 针对64个与癌症相关的基因进行测序,包括PTEN,PIK3CA和PIK3R1热点变异.
- 使用EEC细胞系和非恶性样本来确定错误率和过假阳性.
主要成果:
- NSMP EEC 呈现线性演变,PI3K 途径突变几乎影响所有细胞.
- 在3. 9% - 96%的细胞中,MMRd EEC表现出显著的遗传异质.
- POLE EEC表现出最高的克隆多样性,多个小子克隆在演化过程中趋同.
结论:
- 与NSMP EEC相比,PI3K路径的改变在MMRd/POLE EEC中明显地演变.
- 这些独特的进化模式可能具有重要的治疗意义.
- 需要对具有亚克隆变异的EEC中PI3K通路信号和抑制剂反应进行进一步研究.
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