概括
像NQO这样的烟草致癌物增强APOBEC3B (A3B) 突变发生,协同增加癌症风险和突变. 这种相互作用被称为迪迪玛,发生在吸烟者癌症发生之前.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
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相关的致癌物质.
- APOBEC DNA 细胞氨酸脱氨酶是具有独特特征 (SBS2/SBS13) 的内源性变异原体,通常在吸烟者的瘤中与烟草特异特征 (SBS4) 一起发现.
研究的目的:
- 调查烟草致癌物和内源性APOBEC突变发生之间的相互作用.
- 为了确定这些突变过程是否独立或协同作用.
- 探索APOBEC活动的烟草暴露细胞中突变性增加背后的机制.
主要方法:
- 使用4-尼托基诺林-1-氧化物 (NQO) 作为烟草暴露的模型致癌物.
- 在暴露于NQO的细胞和动物中检查了APOBEC3B (A3B) 突变发生.
- 在体内和瘤基因组中分析了突变负载,头部和部病变以及特定的突变特征 (SBS2,SBS4).
- 研究了APOBEC催化突变的空间分布.
主要成果:
- NQO使细胞对A3B突变产生敏感,导致SBS2突变和口腔癌的协同增加.
- 与对照组相比,暴露于NQO/表达A3B的动物显示头部和部病变的数量是对照组的两倍.
- 很大一部分A3B突变发生在转录区域内作为配对事件 ("didyma"),与DNA修复过程有关.
- 在吸烟者的瘤基因组和癌前肺组织中,APOBEC突变和迪迪玛升高.
结论:
- 烟草烟雾中的DNA引进变异原体可以通过内源APOBEC酶放大变异发生.
- 突变机制可以协同相互作用,影响癌症的发病和进展.
- 发现"didyma"为致癌物-APOBEC相互作用提供了新的机制性洞察力.
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