TERT剪接的遗传调节通过改变细胞寿命和复制潜力,有助于降低或增加癌症风险
Oscar Florez-Vargas1, Michelle Ho1, Maxwell Hogshead1
1Laboratory of Translational Genomics, DCEG, National Cancer Institute, Rockville, MD, USA.
medRxiv : the preprint server for health sciences
|January 13, 2025
概括
在TERT内部6 (VNTR6-1) 中一个可变数串重复和内部4中的GWAS信号通过改变端粒酶 (TERT) 表达和拼接来影响癌症风险,从而影响细胞寿命.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 癌症研究 癌症研究
背景情况:
- 染色体5p15.33区域含有端粒酶逆转录酶 (TERT) 基因,与各种癌症风险有关.
- 该地区的生殖系变异,通过全基因组关联研究 (GWAS) 确定,显示与癌症易感性和保护的复杂关联.
研究的目的:
- 描述TERT 6内子中的一个变数串联重复 (VNTR6-1) 和它与GWAS信号的关联.
- 阐明VNTR6-1和相关的GWAS信号 (rs10069690) 影响TERT表达和拼接的功能机制.
- 研究这些遗传因素对癌症风险和端粒长度的影响.
主要方法:
- 变量数串联重复 (VNTR) 分析TERT内子6.
- 关联研究与GWAS数据 (rs2242652,rs10069690) 和多种癌症风险.
- 功能测试包括G-四重复 (G4) 稳定,CRISPR/Cas9基因编辑和TERT拼接异型的分析.
- 评估细胞表型,如细胞亡和增殖.
主要成果:
- VNTR6-1等位基因 (短和长) 与TERT内部4中的GWAS信号密切相关,完全解释了rs2242652和部分解释rs10069690.
- 无论是VNTR6-1还是rs10069690,无论是单独还是作为单元型,都与多种癌症的风险和与年龄相关的端粒缩短有关.
- VNTR6-1-Long扩展了多态G4结构,而rs10069690-T增加了内子4保留,这两者都导致通过替代拼接和无意中介衰变减少了功能TERT表达.
- G4稳定配体降低了功能TERT,而VNTR6-1删除增加了它,以及改变的亡和增殖.
结论:
- VNTR6-1和rs10069690是TERT表达和拼接的关键调节者,影响功能和非功能端粒酶异型的平衡.
- 改变的TERT异型比可能会调节细胞寿命和复制能力,这有助于在5p15.33位点观察到的差异性癌症风险.
- 这些发现提供了关于 TERT 常见遗传变异如何影响癌症倾向的机制性见解.
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