TDRD5 binds piRNA precursors and selectively enhances pachytene piRNA processing in mice.

TDRD5 binds piRNA precursors and selectively enhances pachytene piRNA processing in mice.
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DOI:
10.1038/s41467-017-02622-w
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发表时间:
2018-01-09
影响因子:
16.6
通讯作者:
Chen C
Chen C
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ding D;Liu J;Midic U;Wu Y;Dong K;Melnick A;Latham KE;Chen C

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粗线期piRNA是哺乳动物成年睾丸中最丰富的piRNA。它们通过初级皮尔纳生物发生途径从长前体转录物产生,但参与粗线期皮尔纳前体加工的因素知之甚少。在这里,我们表明,Tudor结构域包含5(TDRD 5)蛋白是必不可少的粗线期皮尔纳在小鼠中的生物合成。小鼠出生后生殖细胞中TDRD 5的条件性失活揭示了TDRD 5选择性地调节来自丰富的产生piRNA的前体的粗线期piRNA的产生,而对低丰度的piRNA几乎没有影响。出乎意料的是,TDRD5对于前体的5′端加工不是必需的,但对于促进从转录物的其他区域产生piRNA是至关重要的。此外,我们表明TDRD5是一种与皮尔纳前体直接相关的RNA结合蛋白。这些观察结果确立了TDRD 5作为皮尔纳生物发生因子,并揭示了粗线期皮尔纳加工开始时的两个遗传上可分离的步骤。粗线期piRNA是哺乳动物成年睾丸中丰富的piRNA,但其生物发生途径尚未完全了解。在这里,作者将TDRD 5鉴定为小鼠中的皮尔纳生物合成因子,表明它结合皮尔纳前体并促进特定转录区域的粗线期皮尔纳产生。
Pachytene piRNAs are the most abundant piRNAs in mammalian adult testes. They are generated from long precursor transcripts by the primary piRNA biogenesis pathway but the factors involved in pachytene piRNA precursors processing are poorly understood. Here we show that the Tudor domain-containing 5 (TDRD5) protein is essential for pachytene piRNA biogenesis in mice. Conditional inactivation of TDRD5 in mouse postnatal germ cells reveals that TDRD5 selectively regulates the production of pachytene piRNAs from abundant piRNA-producing precursors, with little effect on low-abundant piRNAs. Unexpectedly, TDRD5 is not required for the 5′ end processing of the precursors, but is crucial for promoting production of piRNAs from the other regions of the transcript. Furthermore, we show that TDRD5 is an RNA-binding protein directly associating with piRNA precursors. These observations establish TDRD5 as a piRNA biogenesis factor and reveal two genetically separable steps at the start of pachytene piRNA processing. Pachytene piRNAs are abundant piRNAs in mammalian adult testes but their biogenesis pathway is not fully understood. Here, the authors identify TDRD5 as a piRNA biogenesis factor in mice, showing that it binds piRNA precursors and promotes pachytene piRNA production from specific transcript regions.
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