在肺癌中染色体不稳定的全景
Yang Yang1, Xiaoming Zhong1, William Phillips1
1Ben May Department for Cancer Research, University of Chicago, Chicago, IL, USA.
medRxiv : the preprint server for health sciences
|September 29, 2025
概括
肺癌中的结构变异 (SVs) 在从未吸烟者中更复杂,揭示了不同的分子机制. 这些基因组变化,特别是在EGFR突变瘤中,通过融合途径驱动癌症的发展.
科学领域:
- 基因组学就是基因组学.
- 癌症生物学 癌症生物学
- 在瘤学瘤学.
背景情况:
- 肺癌是一种异质性疾病,在从未吸烟者中发生的比例很大 (LCINS).
- 染色体不稳定性,特别是体质结构变异 (SVs),在肺癌发育中起作用,但其在LCINS中的机制尚不清楚.
- 了解SVs对于破译肺癌复杂的基因组景观至关重要.
研究的目的:
- 综合分析整个基因组测序肺癌的大群体体质结构变异 (SVs),包括大量从未吸烟者 (LCINS).
- 调查吸烟状态,EGFR突变和KRAS突变对SV景观的影响及其在瘤发生中的作用.
- 识别和表征不同的SV特征及其基因组分布,以推断潜在的突变性机制和选择压力.
主要方法:
- 1,209个肺癌样本的全基因组测序,包括864个LCINS.
- 检测和全面分析了182,429个体质结构变异 (SVs).
- 对 SV 标志的分解和分析 SV 断点分布及其与基因突变和基因组特征的关联.
主要成果:
- 在肺癌吸烟者 (LCSS) 中,SVs更为丰富,但在LCINS中显示出更大的复杂性和在瘤发生中更重要的作用.
- EGFR突变与较高的SV负担和更多的致癌性SV相关,而KRAS突变与较低的SV负担相关.
- 鉴定了16种不同的SV签名,突出了不同的分子机制,许多致癌基因被多个SV签名反复重新排列,表明了功能融合.
结论:
- 在肺癌的瘤发生过程中,SVs起着至关重要的和复杂的作用,特别是在从未吸烟的人群中.
- EGFR和KRAS突变显著塑造了SV景观,影响了瘤进化和基因组不稳定性.
- 鉴定到的SV特征和反复发生的基因重组,为我们提供了关于致变基因过程和选择性压力导致肺癌基因组不稳定的见解.
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