Elevated expression of Piwi and piRNAs in ovaries of triploid crucian carp

Elevated expression of Piwi and piRNAs in ovaries of triploid crucian carp
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三倍体鲫鱼卵巢中 Piwi 和 piRNA 的表达升高

DOI:
10.1016/j.mce.2013.11.019
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发表时间:
2014-03
影响因子:
4.1
通讯作者:
Min Tao
Min Tao
中科院分区:
医学2区
文献类型:
--
作者:
Yi Zhou;Huan Zhong;Shaojun Liu;Fan Yu;Jie Hu;Chun Zhang;Min Tao

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增加piRNA提供RNA干扰途径以调节生殖系细胞中的转座子和基因表达。我们证明了Piwi转录只在硬骨鱼的成年睾丸和卵巢中表达,三倍体在卵巢中的Piwi表达最高。体内和体外培养结果显示hCG和E2处理抑制Piwi的表达。我们进一步克隆了这三种鱼中的200个小RNA。从所有三种不同倍性的鱼获得七种piRNA。在排卵期间,五种piRNA在不育三倍体的卵巢中显示出比可育二倍体和四倍体显著更高的表达。E2在体内和体外均不同程度地抑制了6种piRNA的表达。本研究通过表明功能失调的HPG轴消除了三倍体鱼中的皮尔纳抑制来弥合HPG轴和Piwi-piRNA途径之间的差距。
Increasing piRNAs provide RNA-interference pathways to regulate transposons and gene expression in germline cells. We demonstrate thatPiwitranscripts are exclusively expressed in adult testes and ovaries in teleosts, with triploids showing the highest Piwi expression in the ovaries. Studiesin vivoandin vitroshowed that hCG and E2 treatment suppressed Piwi expression. We further cloned 200 small RNAs in the three kinds of fish. Seven piRNAs were obtained from all the three different ploidy fishes. During ovulation, five piRNAs showed significantly higher expression in the ovaries of sterile triploids than fertile diploids and tetraploids. Furthermore, E2 suppressed the expression of the six piRNAs at different levelsin vivoandin vitro. The present study bridges the gap between the HPG axis and Piwi–piRNA pathway by suggesting that a dysfunctional HPG axis abrogated the piRNA suppression in triploid fish.
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