DNA 低甲基化是AGO1和AGO1-V2异型在瘤中的表观遗传交换的基础
Jean S Fain1, Camille Wangermez1, Axelle Loriot2
1Group of Genetics and Epigenetics, de Duve Institute, Université Catholique de Louvain, 1200 Brussels, Belgium.
Epigenomes
|July 25, 2024
概括
人类瘤表现出表观遗传变化,包括DNA甲基化变化. 瘤中AGO1-V2转录的异常激活驱动AGO1基因的高甲基化,导致交换的蛋白质异型.
科学领域:
- 表观遗传学和癌症生物学
- 分子瘤学分子瘤学
- 基因规则 基因规则
背景情况:
- 人类瘤积累了表观遗传变化,包括DNA甲基化变化.
- 基因低甲基化可以驱动下游基因促进者的高甲基化.
- AGO1基因对于miRNA生物发生和RNA干扰至关重要.
研究的目的:
- 调查DNA低甲基化诱导的高甲基化机制是否适用于AGO1位点.
- 描述一种替代的AGO1转录 (AGO1-V2) 的表达和表观遗传调节.
- 为了确定AGO1-V2表达在癌症中的功能后果.
主要方法:
- 对公共RNA-Seq,转录组和甲基组数据集的分析.
- 逆转录定量PCR (RT-qPCR) 用于基因表达分析.
- 西方斑点实验用于蛋白质异型体征.
主要成果:
- 一种替代性转录,AGO1-V2,在丸生殖细胞中特意表达,并在各种瘤 (食道,胃,肺) 中异常激活.
- AGO1-V2激活取决于其促进体的DNA脱甲基化,将其归类为癌症生殖线 (CG) 基因.
- AGO1-V2编码了一个缩短的AGO1异型 (∆NAGO1),其低甲基化/激活与瘤中的AGO1高甲基化/抑制相关.
结论:
- 揭示了AGO1位点相互依赖的表观遗传变化的新机制.
- 在瘤中AGO1-V2的异常激活导致AGO1蛋白质异型体的交换表达.
- 这种表观遗传重编程有助于通过改变miRNA生物发生的瘤进展.
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