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Locus control region transcription plays an active role in long-range genie activation

机译:基因座控制区转录在远程精灵激活中起积极作用

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摘要

Activation of eukaryotic genes often relies on remote chromatin determinants. How these determinants function remains poorly understood. The hGH gene is activated by a 5'-remote locus control region (LCR). Pituitary-specific DNase I hypersensitive site I (HSI), the dominant hGH LCR element, is separated from the hGH-N promoter by a 14.5 kb span that encompasses the B-lymphocyte-specific CD79b gene. Here, we describe a domain of noncoding Pol II transcription in pituitary somatotropes that includes the hGH LCR and adjacent CD79b locus. This entire "LCR domain of transcription" is HIS dependent and terminates 31 to CD79b, leaving a gap in transcription between this domain and the target hGH-N promoter. Insertion of a Pol II terminator within the LCR blocks CD79b transcription and represses hGH-N expression. These data document an essential role for LCR transcription in long-range control, link "bystander" CD79b transcription to this process, and support a unique model for locus activation.
机译:真核基因的激活通常依赖于远端的染色质决定簇。这些决定因素如何发挥作用仍然知之甚少。 hGH基因被5'远程基因座控制区(LCR)激活。垂体特异性DNase I超敏位点I(HSI),占主导地位的hGH LCR元件,与hGH-N启动子分隔开14.5 kb的跨度,该跨度涵盖B淋巴细胞特异性CD79b基因。在这里,我们描述了包括hGH LCR和相邻CD79b基因座的垂体生长激素中非编码Pol II转录的域。整个“转录的LCR结构域”是HIS依赖性的,终止于CD79b的31位,在该结构域与靶hGH-N启动子之间留下转录间隙。在LCR中插入Pol II终止子可阻止CD79b转录并抑制hGH-N表达。这些数据记录了LCR转录在远程控制中的重要作用,将“旁观者” CD79b转录与该过程联系起来,并支持基因座激活的独特模型。

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