烟草烟雾的致癌物加剧了APOBEC的突变和致癌
Cameron Durfee1, Erik N Bergstrom2,3,4, Marcos Díaz-Gay2,3,4,5
1Department of Biochemistry and Structural Biology, University of Texas Health San Antonio, San Antonio, Texas, USA, 78229.
bioRxiv : the preprint server for biology
|February 3, 2025
概括
像NQO这样的烟草致癌物放大致癌APOBEC3B (A3B) 突变,协同增加突变和头瘤. 这种相互作用,标志着称为迪迪玛的配对突变,在吸烟者中升高.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 从内在和外在因素的体质突变驱动癌症的发展.
- 烟草烟雾含有与肺癌和头癌有关的致癌物质.
- 在吸烟者的瘤中,APOBEC DNA 细胞氨酸脱氨酶是具有明显特征 (SBS2/SBS13) 的内源性变异原体,通常与烟草相关特征 (SBS4) 发现.
研究的目的:
- 为了研究烟草致癌物和APOBEC突变发生之间的相互作用.
- 为了确定4-基诺林-1-氧化物 (NQO) 暴露是否会影响APOBEC3B (A3B) 活性和癌症的发展.
- 为了确定新的突变模式及其在吸烟者癌症中的相关性.
主要方法:
- 向表达APOBEC3B (A3B) 的动物施用NQO,一种烟草致癌模型.
- 评估了NQO暴露/A3B表达动物与对照动物的头病变发展和突变负载.
- 分析了瘤基因组的APOBEC (SBS2) 和NQO (SBS4) 签名,并确定了集群突变 (didyma).
主要成果:
- NQO暴露协同增加了A3B突变发生,导致头部和部病变的数量增加了两倍.
- APOBEC特征SBS2突变的协同增长,但不是SBS4,伴随着癌症发生的增加.
- 鉴定了"didyma",在32个核酸中配对SBS2突变,在转录区域中丰富,并与NQO-DNA adduct修复相关.
- 在吸烟者的肺和头部瘤中,APOBEC的突变和滴度升高,甚至在正常的肺组织中.
结论:
- 像NQO这样的烟草致癌物可以放大内源性APOBEC突变发生,以协同作用促进癌症.
- 新型突变模式"didyma"提供了机械洞察力,了解DNA附加物如何增强APOBEC活动.
- 这些发现突显了癌症发病和进展中的突变过程之间的协同作用,特别是在吸烟者中.
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