Cleavage of TFIIA by Taspase1 activates TRF2-specified mammalian male germ cell programs.

Cleavage of TFIIA by Taspase1 activates TRF2-specified mammalian male germ cell programs.
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DOI:
10.1016/j.devcel.2013.09.025
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发表时间:
2013-10-28
期刊:
影响因子:
11.8
通讯作者:
Hsieh, James J.
Hsieh, James J.
中科院分区:
生物学1区
文献类型:
--
作者:
Oyama, Toshinao;Sasagawa, Satoru;Takeda, Shugaku;Hess, Rex A.;Lieberman, Paul M.;Cheng, Emily H.;Hsieh, James J.

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组织特异性一般转录因子(GTF)的进化,如睾丸特异性tbp相关因子2 (TRF2),使高度特化的遗传程序的时空表达成为可能。Taspase1是一种切割核因子MLL1、MLL2、TFIIAα-β和ALFα-β (TFIIAτ)的蛋白酶。在这里,我们证明了taspase1介导的TFIIAα-β加工驱动哺乳动物精子发生。Taspase1 - / -和不可切割的TFIIAα-βnc/nc睾丸释放的未成熟生殖细胞都具有过渡蛋白(Tnp)和蛋白蛋白(Prm)的转录受损,表现出染色质压实缺陷,与TRF2 - / -睾丸观察到的相同。尽管未加工的TFIIA仍然与TRF2复合物,但该复合物在靶向和激活Tnp1和Prm1启动子方面受损。目前的研究提出了一种范式,其中蛋白酶(Taspase1)切割无处不在表达的GTF (TFIIA),以实现组织特异性(睾丸)转录,满足高等生物对不同基因亚群的复杂调控需求。
The evolution of tissue-specific general transcription factors (GTF), such as testis-specific TBP-related factor 2 (TRF2), enables the spatiotemporal expression of highly specialized genetic programs. Taspase1 is a protease that cleaves nuclear factors MLL1, MLL2, TFIIAα-β, and ALFα-β (TFIIAτ). Here we demonstrate that Taspase1-mediated processing of TFIIAα-β drives mammalian spermatogenesis. Both Taspase1−/− and non-cleavable TFIIAα-βnc/nc testes release immature germ cells with impaired transcription of Transition proteins (Tnp) and Protamines (Prm), exhibiting chromatin compaction defects, recapitulating those observed with TRF2−/− testes. Although the unprocessed TFIIA still complexes with TRF2, this complex is impaired in targeting and thus activating Tnp1 and Prm1 promoters. Current study presents a paradigm in which a protease (Taspase1) cleaves a ubiquitously expressed GTF (TFIIA) to enable tissue-specific (testis) transcription, meeting the demand for sophisticated regulation of distinct subsets of genes in higher organisms.
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