Global Hypertranscription in the Mouse Embryonic Germline.

Global Hypertranscription in the Mouse Embryonic Germline.
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DOI:
10.1016/j.celrep.2017.05.036
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发表时间:
2017-06-06
期刊:
影响因子:
8.8
通讯作者:
Ramalho-Santos M
Ramalho-Santos M
中科院分区:
生物学1区
文献类型:
--
作者:
Percharde M;Wong P;Ramalho-Santos M

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原始生殖细胞(PGCs)对遗传和进化至关重要。它们的转录程序已被广泛研究,并被认为是众所周知的。我们在这里报告了一个显着的全球上调小鼠PGCs的转录组相比,体细胞。使用细胞数归一化的全基因组分析,我们发现显着的转录扩增PGC,包括mRNA,rRNA和转座因子。超转录保留了组织特异性基因表达模式,与细胞大小相关,并且当增殖停止时,仍然可以在E15.5雄性生殖细胞中检测到。PGC超转录发生在新生转录水平,伴随翻译速率增加,并且由Myc因子n-Myc和l-Myc(但不是c-Myc)以及P-TEFb驱动。这项研究提供了一个范例,在发展过程中的转录分析,并揭示了一个主要的全球性的生殖系转录组的活性亢进。Percharde等发现小鼠原始生殖细胞处于由Myc因子和P-TEFb驱动的超转录状态。
Primordial germ cells (PGCs) are vital for inheritance and evolution. Their transcriptional program has been extensively studied and is assumed to be well-known. We report here a remarkable global upregulation of the transcriptome of mouse PGCs compared to somatic cells. Using cell-number normalized genome-wide analyses, we uncover significant transcriptional amplification in PGCs, including mRNAs, rRNA and transposable elements. Hypertranscription preserves tissue-specific gene expression patterns, correlates with cell size, and can still be detected in E15.5 male germ cells, when proliferation has ceased. PGC hypertranscription occurs at the level of nascent transcription, is accompanied by increased translation rates, and is driven by Myc factors n-Myc and l-Myc (but not c-Myc) and by P-TEFb. This study provides a paradigm for transcriptional analyses during development and reveals a major global hyperactivity of the germline transcriptome. Percharde et al. find that mouse primordial germ cells are in a state of hypertranscription driven by Myc factors and P-TEFb.
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