骨骼肌干细胞中的DNA g -四重体分析揭示了功能和机制的见解

IF 10.1 1区 生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Xiaona Chen, Feng Yang, Suyang Zhang, Xiaofan Guo, Jieyu Zhao, Yulong Qiao, Liangqiang He, Yang Li, Qin Zhou, Michael Tim-Yun Ong, Chun Kit Kwok, Hao Sun, Huating Wang
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引用次数: 0

摘要

DNA g -四plex (G4s)是在富含鸟嘌呤的DNA序列中形成的非规范二级结构,通过多种基因调控机制在调节生物过程中发挥重要作用。新兴的G4剖面可以对内源性G4形成进行全局映射。在这项研究中,我们绘制了成人骨骼肌干细胞(MuSCs)的G4图谱,这对损伤诱导的肌肉再生至关重要。在MuSCs的肌源性谱系进展中,我们发现动态内源性G4形成,当MuSCs被激活和增殖时,G4诱导明显。我们进一步证明G4诱导促进了MuSC的激活,从而促进了再生过程。在机制上,我们发现启动子相关的G4s通过促进染色质环来调节基因转录。此外,我们发现G4位点在活化的musc中富集转录因子(TF)结合事件;MAX与G4结构结合,协同促进染色质环和基因转录,从而促进MuSC的活化和再生。上述发现的全球调控功能/机制在Ccne1启动子的范式上进一步剖析,证明Ccne1是激活的musc中真正的G4/MAX调控靶点。总之,我们的研究结果首次证明了G4s在成年MuSC中普遍存在和动态形成,以及G4s在调节基因表达和MuSC激活/增殖中的机制作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
DNA G-quadruplex profiling in skeletal muscle stem cells reveals functional and mechanistic insights
DNA G-quadruplexes (G4s) are non-canonical secondary structures formed in guanine-rich DNA sequences and play important roles in modulating biological processes through a variety of gene regulatory mechanisms. Emerging G4 profiling allows global mapping of endogenous G4 formation. Here in this study, we map the G4 landscapes in adult skeletal muscle stem cells (MuSCs), which are essential for injury-induced muscle regeneration. Throughout the myogenic lineage progression of MuSCs, we uncover dynamic endogenous G4 formation with a pronounced G4 induction when MuSCs become activated and proliferating. We further demonstrate that the G4 induction promotes MuSC activation thus the regeneration process. Mechanistically, we found that promoter-associated G4s regulate gene transcription through facilitating chromatin looping. Furthermore, we found that G4 sites are enriched for transcription factor (TF) binding events in activated MuSCs; MAX binds to G4 structures to synergistically facilitate chromatin looping and gene transcription, thus promoting MuSC activation and regeneration. The above uncovered global regulatory functions/mechanisms are further dissected on the paradigm of Ccne1 promoter, demonstrating that Ccne1 is a bona fide G4/MAX regulatory target in activated MuSCs. Altogether, our findings for the first time demonstrate the prevalent and dynamic formation of G4s in adult MuSCs and the mechanistic role of G4s in modulating gene expression and MuSC activation/proliferation.
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来源期刊
Genome Biology
Genome Biology Biochemistry, Genetics and Molecular Biology-Genetics
CiteScore
21.00
自引率
3.30%
发文量
241
审稿时长
2 months
期刊介绍: Genome Biology stands as a premier platform for exceptional research across all domains of biology and biomedicine, explored through a genomic and post-genomic lens. With an impressive impact factor of 12.3 (2022),* the journal secures its position as the 3rd-ranked research journal in the Genetics and Heredity category and the 2nd-ranked research journal in the Biotechnology and Applied Microbiology category by Thomson Reuters. Notably, Genome Biology holds the distinction of being the highest-ranked open-access journal in this category. Our dedicated team of highly trained in-house Editors collaborates closely with our esteemed Editorial Board of international experts, ensuring the journal remains on the forefront of scientific advances and community standards. Regular engagement with researchers at conferences and institute visits underscores our commitment to staying abreast of the latest developments in the field.
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