Pachytene piRNAs instruct massive mRNA elimination during late spermiogenesis.

Pachytene piRNAs instruct massive mRNA elimination during late spermiogenesis.
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粗线期 piRNA 在精子发生后期指导大量 mRNA 消除

DOI:
10.1038/cr.2014.41
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发表时间:
2014-06
期刊:
影响因子:
44.1
通讯作者:
--
中科院分区:
生物学1区
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--
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哺乳动物精子发生的特征在于两波皮尔纳表达:一波对应于负责沉默反转录子的经典piRNA,第二波主要来源于粗线期精母细胞中的非转座子基因间区域,但这些粗线期piRNA的功能在很大程度上是未知的。在这里,我们报告了粗线期piRNA参与指导小鼠延长精子细胞(ES)中的大量mRNA消除。我们证明了含有鼠PIWI(MIWI)和去腺苷酸酶CAF 1的piRNA诱导沉默复合物(pi-RISC)在ES中选择性组装,其负责通过类似于体细胞中miRNA作用的机制诱导mRNA去腺苷酸化和衰变。这种高度协调的程序似乎充分利用了来源于非转座子基因间区域的粗线期piRNA的多样化靶向能力的巨大库。这些发现表明,粗线期piRNA负责使大量细胞程序失活,以准备从ES产生精子。
Spermatogenesis in mammals is characterized by two waves of piRNA expression: one corresponds to classic piRNAs responsible for silencing retrotransponsons and the second wave is predominantly derived from nontransposon intergenic regions in pachytene spermatocytes, but the function of these pachytene piRNAs is largely unknown. Here, we report the involvement of pachytene piRNAs in instructing massive mRNA elimination in mouse elongating spermatids (ES). We demonstrate that a piRNA-induced silencing complex (pi-RISC) containing murine PIWI (MIWI) and deadenylase CAF1 is selectively assembled in ES, which is responsible for inducing mRNA deadenylation and decay via a mechanism that resembles the action of miRNAs in somatic cells. Such a highly orchestrated program appears to take full advantage of the enormous repertoire of diversified targeting capacity of pachytene piRNAs derived from nontransposon intergenic regions. These findings suggest that pachytene piRNAs are responsible for inactivating vast cellular programs in preparation for sperm production from ES.
DOI: 10.1002/dvg.1020160205
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