Piwi Is a Key Regulator of Both Somatic and Germline Stem Cells in the Drosophila Testis.

Piwi Is a Key Regulator of Both Somatic and Germline Stem Cells in the Drosophila Testis.
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DOI:
10.1016/j.celrep.2015.06.004
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发表时间:
2015-07-07
期刊:
影响因子:
8.8
通讯作者:
Lin H
Lin H
中科院分区:
生物学1区
文献类型:
--
作者:
Gonzalez J;Qi H;Liu N;Lin H

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Piwi-piRNA途径以其生殖系功能而闻名,但其体细胞作用仍然难以捉摸。我们在这里表明,Piwi是自主需要的,不仅为生殖系干细胞(GSC),但也为体细胞囊肿干细胞(CySC)的维护在果蝇睾丸。减少睾丸中的Piwi活性导致CySC分化缺陷。伴随着这一点,GSC的女儿扩展到枢纽附近以外,但未能进一步区分。此外,Piwi核定位缺陷导致体细胞和生殖细胞分化的类似缺陷,这是由体细胞Piwi表达拯救的。为了探索潜在的分子机制,我们鉴定了Piwi结合的piRNA,其独特地映射到性腺发育的基因关键Fasciclin 3,并证明Piwi调节其在体细胞囊肿细胞中的表达。我们的工作揭示了Piwi在体细胞和生殖干细胞类型中的细胞自主功能,体细胞功能可能通过其表观遗传机制实现。
The Piwi-piRNA pathway is well known for its germline function, yet its somatic role remains elusive. We show here that Piwi is required autonomously not only for germline stem cell (GSC) but also for somatic cyst stem cell (CySC) maintenance in the Drosophila testis. Reducing Piwi activity in the testis caused defects in CySC differentiation. Accompanying this, GSC daughters expanded beyond the vicinity of the hub but failed to differentiate further. Moreover, Piwi deficient in nuclear localization caused similar defects in somatic and germ cell differentiation, which was rescued by somatic Piwi expression. To explore the underlying molecular mechanism, we identified Piwi-bound piRNAs that uniquely map to a gene key for gonadal development, Fasciclin 3, and demonstrate that Piwi regulates its expression in somatic cyst cells. Our work reveals the cell-autonomous function of Piwi in both somatic and germline stem cell types, with somatic function possibly via its epigenetic mechanism.
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