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Spt5-mediated enhancer transcription directly couples enhancer activation with physical promoter interaction.
Nature Genetics ( IF 31.7 ) Pub Date : 2020-04-06 , DOI: 10.1038/s41588-020-0605-6
Johanna Fitz 1 , Tobias Neumann 1 , Monika Steininger 1 , Eva-Maria Wiedemann 1 , Adriana Cantoran Garcia 1 , Alexander Athanasiadis 1 , Ursula E Schoeberl 1 , Rushad Pavri 1
Affiliation  

Active enhancers are frequently transcribed, yet the regulatory role of enhancer transcription remains debated. Here, we depleted the RNA polymerase II pausing and elongation factor Spt5 in activated mouse B cells and found that approximately 50% of enhancer-gene pairs showed co-regulated transcription, consistent with a potential functional requirement for enhancer transcription. In particular, Spt5 depletion led to loss of super-enhancer-promoter physical interaction and gene expression at the immunoglobulin heavy-chain locus (Igh), abrogating antibody class switch recombination. This defect correlated strictly with loss of enhancer transcription but did not affect acetylation of histone H3 at lysine 27, chromatin accessibility and occupancy of Mediator and cohesin at the enhancer. Strikingly, CRISPRa-mediated rescue of enhancer transcription in Spt5-depleted cells restored Igh gene expression. Our work suggests that Spt5-mediated enhancer transcription underlies the physical and functional interaction between a subset of active enhancers and their target promoters.

中文翻译:


Spt5 介导的增强子转录直接将增强子激活与物理启动子相互作用结合起来。



活性增强子经常被转录,但增强子转录的调节作用仍然存在争议。在这里,我们耗尽了激活的小鼠 B 细胞中的 RNA 聚合酶 II 暂停和延伸因子 Spt5,发现大约 50% 的增强子基因对显示出共同调节的转录,这与增强子转录的潜在功能要求一致。特别是,Spt5 缺失导致超级增强子-启动子物理相互作用和免疫球蛋白重链位点 (Igh) 基因表达丧失,从而消除抗体类别转换重组。该缺陷与增强子转录的丢失严格相关,但不影响组蛋白 H3 在赖氨酸 27 处的乙酰化、染色质可及性以及增强子处介子和粘连蛋白的占据。引人注目的是,在 Spt5 耗尽的细胞中,CRISPRa 介导的增强子转录拯救恢复了 Igh 基因表达。我们的工作表明,Spt5 介导的增强子转录是活性增强子子集与其目标启动子之间物理和功能相互作用的基础。
更新日期:2020-04-24
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