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Modulation of m 6 A RNA modification by DAP3 in cancer cells
Proceedings of the National Academy of Sciences of the United States of America ( IF 9.4 ) Pub Date : 2024-09-24 , DOI: 10.1073/pnas.2404509121
Jian Han, Yangyang Song, Jinghe Xie, Vincent Tano, Haoqing Shen, Wei Liang Gan, Larry Ng, Bryan Yik Loong Ng, Vanessa Hui En Ng, Xiaohui Sui, Sze Jing Tang, Leilei Chen

N 6 -methyladenosine (m 6 A) RNA methylation is a prevalent RNA modification that significantly impacts RNA metabolism and cancer development. Maintaining the global m 6 A levels in cancer cells relies on RNA accessibility to methyltransferases and the availability of the methyl donor S-adenosylmethionine (SAM). Here, we reveal that death associated protein 3 (DAP3) plays a crucial role in preserving m 6 A levels through two distinct mechanisms. First, although DAP3 is not a component of the m 6 A writer complex, it directly binds to m 6 A target regions, thereby facilitating METTL3 binding. Second, DAP3 promotes MAT2A ’s last intron splicing, increasing MAT2A protein, cellular SAM, and m 6 A levels. Silencing DAP3 hinders tumorigenesis, which can be rescued by MAT2A overexpression. This evidence suggests DAP3’s role in tumorigenesis, partly through m 6 A regulation. Our findings unveil DAP3’s complex role as an RNA-binding protein and tumor promoter, impacting RNA processing, splicing, and m 6 A modification in cancer transcriptomes.

中文翻译:


DAP3 对癌细胞中 m 6 A RNA 修饰的调节



N 6-甲基腺苷 (m 6 A) RNA 甲基化是一种普遍的 RNA 修饰,可显著影响 RNA 代谢和癌症发展。维持癌细胞中的整体 m 6 A 水平取决于 RNA 对甲基转移酶的可及性和甲基供体 S-腺苷甲硫氨酸 (SAM) 的可用性。在这里,我们揭示了死亡相关蛋白 3 (DAP3) 通过两种不同的机制在维持 m 6 A 水平方面起着至关重要的作用。首先,虽然 DAP3 不是 m 6 A 写入蛋白复合体的组分,但它直接与 m 6 A 靶区域结合,从而促进 METTL3 结合。其次,DAP3 促进 MAT2A 的最后一次内含子剪接,增加 MAT2A 蛋白、细胞 SAM 和 m 6 A 水平。沉默 DAP3 会阻碍肿瘤发生,这可以通过 MAT2A 过表达来挽救。该证据表明 DAP3 在肿瘤发生中的作用,部分通过 m 6 A 调节。我们的研究结果揭示了 DAP3 作为 RNA 结合蛋白和肿瘤启动子的复杂作用,影响癌症转录组中的 RNA 加工、剪接和 m 6 A 修饰。
更新日期:2024-09-24
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