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WTAP-mediated m 6 A modification of lncRNA NORAD promotes intervertebral disc degeneration.

Gaocai LiLiang MaShujie HeRongjin LuoBingjin WangWeifeng ZhangYu SongZhiwei LiaoWencan KeQian XiangXiaobo FengXinghuo WuYukun ZhangKun WangCao Yang
Published in: Nature communications (2022)
N6-methyladenosine (m 6 A) is the most prevalent RNA modification at the posttranscriptional level and involved in various diseases and cellular processes. However, the underlying mechanism of m 6 A regulation in intervertebral disc degeneration (IVDD) remains elusive. Here, we show that methylation of the lncRNA NORAD significantly increases in senescent nucleus pulposus cells (NPCs) by m 6 A sequencing. Subsequent loss- and gain-of-function experiments reveal WTAP is increased in senescent NPCs due to an epigenetic increase in H3K4me3 of the promoter mediated by KDM5a, and significantly promotes NORAD m 6 A modification. Furthermore, YTHDF2-mediated decay of NORAD is enhanced in senescent NPCs, and then deficiency of NORAD results in less sequestraion of PUMILIO proteins, contributing to the augmented activity of PUM1/2, thus repressing the expression of target E2F3 mRNAs and promoting the cellular senescence. Here, we show interruption of NORAD m 6 A modification or the NORAD/PUMILIO/E2F3 axis could serve as a potential therapeutic target to inhibit the senescence of NPCs and development of IVDD.
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