Rev1过度表达通过增加突变发生加速N-甲基-N-尿素 (MNU) 诱导的胸膜淋巴瘤
Megumi Sasatani1, Yang Xi1,2, Kazuhiro Daino3
1Department of Experimental Oncology, Research Institute for Radiation Biology and Medicine, Hiroshima University, Hiroshima, Japan.
Cancer science
|April 4, 2024
概括
Rev1的过度表达加速了突变发生,并通过增强遗传不稳定性和缩短DNA损伤后的疾病潜伏时间,增加了小鼠的胸腺淋巴瘤发病率.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 遗传学 遗传学 是一个
背景情况:
- Rev1对于转化合成至关重要,作为支架并具有dCMP转移酶活性.
- 在突变和瘤发生过程中Rev1的体内作用仍然不完全理解.
- 之前的研究表明,Rev1过度表达的小鼠在N-甲基-N-氨酸尿素 (MNU) 治疗后发展出更多的肠腺瘤和胸腺淋巴瘤.
研究的目的:
- 为了研究Rev1过度表达在MNU诱导的胸腺淋巴瘤 (TL) 瘤发生过程中对突变发生的影响.
- 为了比较突变档案,并识别来自野生型 (WT) 和Rev1-转基因 (Rev1-Tg) 小鼠的TLs中的突变特征.
主要方法:
- 整体外因子测序 (WES) 用于分析从WT和Rev1-Tg小鼠中MNU诱导的TLs中的突变发生.
- 使用癌症体质突变目录 (COSMIC) 数据库进行突变特征分析.
- 预白血病细胞的早期检测在MNU治疗后进行评估.
主要成果:
- 与WTTLs相比,Rev1-TgTLs通常表现出更高的突变频率.
- 在COSMIC基因内的非同义突变或影响Notch1和MAPK信号通路的突变中没有发现显著差异.
- 突变特征与与衰老相关的 (SBS5) 和与化相关的 (SBS11) 特征有相似之处,SBS5的贡献与总突变数量有正相关,这表明Rev1-Tg TLs中的遗传不稳定性加速.
- 在Rev1-Tg小鼠中,预白血病细胞的检测比在WT小鼠中更早.
结论:
- Rev1过度表达加速了突变发生,并增加了MNU诱导的胸腺淋巴瘤的发生率.
- 这种加速与缩短的延迟期和可能增加的DNA损伤引起的遗传不稳定性有关.
- 在生物体内,Rev1在调节对DNA损伤的突变性反应方面发挥着重要作用.
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