人类基因组中富含G4形成的重复与强大的协调良好的转录和减少癌症转录组变异有关
Ruth B De-Paula1, Albino Bacolla2, Aleem Syed2
1Graduate School of Biomedical Sciences, Baylor College of Medicine, Houston, Texas, USA; Department of Molecular and Cellular Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA.
The Journal of biological chemistry
|September 28, 2024
概括
基因起始点附近的G-四重复 (G4) DNA结构与人类更高,更稳定的RNA表达有关. 这种人类基因组特征可以解释基因表达差异和减少癌症变异.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 生物信息学是一种生物信息学.
背景情况:
- 非B DNA G-四重复 (G4) 结构可以影响基因转录.
- G4序列的确切作用和全基因组分布仍然不完全理解.
研究的目的:
- 综合评估跨哺乳动物基因组的G-quadruplex (G4) 序列和RNA转录水平之间的相关性.
- 研究人类正常和瘤组织中假定G4序列 (pG4) 的基因组分布.
主要方法:
- 利用生物信息算法分析全基因组pG4位置.
- 在人类,黑猩猩和老鼠基因组中,与稳定状态RNA转录水平相关的pG4发生.
- 在正常与瘤人体组织中比较pG4分布和基因表达.
主要成果:
- 与没有pG4的人类基因相比,具有pG4的人类基因表达水平更高.
- 在人类基因组中,pG4序列在转录起点 (TSSs) 得到丰富,但不是在黑猩猩或老鼠中.
- 人类pG4含有的基因表现出较低的表达变异性,特别是在瘤中.
- 突变性pG4序列与易发生替代DNA结构的区域有关.
结论:
- 人类TSS中pG4的高患病率与强大的转录和减少癌症转录组变异有关.
- 在人类TSS中pG4的丰富可能表明积极的选择,有助于基因表达分歧.
- 人类正常和瘤组织之间的G4特征的差异需要进一步研究治疗应用.
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