Epigenetic regulation of co-transcriptional R-loops via IGF2BPs drives SEMA3F-mediated prostate cancer growth retardation and docetaxel chemosensitivity enhancement

Author:

Ying Yufan1,Tang Yijie1,Wu Yuqing1,Yi Jiahe1,Liu Zixiang1,Ma Xueyou1,Fang Jiajie1,Li Jiangfeng1,Chen Danni1,Wang Xiao1,Liu Xiaoyan1,Liu Ben1,Luo Jindan1,Zheng Xiangyi1,Xie Liping1

Affiliation:

1. First Affiliated Hospital Zhejiang University

Abstract

Abstract R-loops are prevalent three-stranded nucleic acid structures, comprising a DNA-RNA hybrid and a displaced single-stranded DNA, that frequently form during transcription and may be attributed to genomic stability and gene expression regulation. It was recently discovered that RNA modification contributes to maintain the stability of R-loops such as N6-methyladenosine (m6A). Yet, m6A-modified R-loops in regulating gene transcription remains poorly understood. Here, we demonstrated that insulin-like growth factor 2 mRNA-binding proteins (IGF2BPs) recognize R-loops in an m6A-dependent way. Consequently, IGF2BPs overexpression leads to increased overall R-loop levels, cell migration inhibition, cell growth retardation and docetaxel chemosensitivity in prostate cancer (PCa) via precluding the binding of DNA methyltransferase 1(DNMT1) to semaphorin 3F (SEMA3F) promoters. Moreover, the K homology (KH) domains of IGF2BPs are required for their recognition of m6A-containing R-loops and are required for tumor suppressor functions. Our findings point to a distinct R-loop resolution pathway mediated by IGF2BPs, emphasizing the functional importance of IGF2BPs as epigenetic R-loop readers in transcriptional genetic regulation and cancer biology.

Publisher

Research Square Platform LLC

Reference32 articles.

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