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《科学》 2026年10月15日 · 中文解读

植物中染色质相关蛋白编码转录本调控靶基因表达

Regulation of target gene expression by chromatin-associated protein-coding transcripts in plants · L. Han et al.
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研究人员在拟南芥中鉴定出686个介导跨位点染色质相互作用的蛋白编码转录本,并解析了其中BT2与GSL8两个转录本的调控机制。BT2转录本通过与CEP2和MRF4位点形成RNA–DNA三链结构,促进抑制性组蛋白修饰H3K9me2和H3K27me3的沉积,从而抑制靶基因转录,影响主根伸长与开花时间。GSL8则通过不依赖三链结构的途径抑制MAT3等靶基因,表明蛋白编码转录本本身具有独立于其编码蛋白的基因调控功能。
原文开头
Lu Han†, Yuxiang Yuan†, Yujie Liu, Yan Li, Yijun Qi* INTRODUCTION: Eukaryotic genomes undergo pervasive transcription, generating a diverse repertoire of cellular RNAs, including protein-coding messenger RNAs (mRNAs) and noncoding RNAs. Noncoding RNAs are well-recognized to orchestrate transcriptional programs through chromatin association. By contrast, protein-coding mRNAs have long been viewed solely as informational intermediaries that relay genetic sequence from DNA to functional proteins. Whether mRNAs possess intrinsic regulatory activities independently of their encoded protein products remains poorly defined. RATIONALE: Genome-wide profiling of RNA–chromatin interactions in Arabidopsis thaliana has uncovered that numerous protein-coding transcripts bind to distal genomic loci outside their own transcription units. …
摘自《科学》(Science)2026年10月15日,L. Han et al.。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。
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