How might flukes and tapeworms maintain genome integrity without a canonical piRNA pathway?

How might flukes and tapeworms maintain genome integrity without a canonical piRNA pathway?
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DOI:
10.1016/j.pt.2014.01.001
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发表时间:
2014-03
影响因子:
9.6
通讯作者:
Brindley PJ
Brindley PJ
中科院分区:
医学1区
文献类型:
--
作者:
Skinner DE;Rinaldi G;Koziol U;Brehm K;Brindley PJ

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通过RNA干扰进行监测是控制转座因子(TE)移动的核心。在干细胞中,Piwi argonaute(Ago)蛋白和相关蛋白抑制TE的动员以维持基因组完整性。这种靶向TE的防御机制被称为Piwi相互作用RNA(Piwi-piRNA)途径。在本意见中,我们提请注意绦虫和吸虫的基因组已经丢失了piwi和vasa基因的情况,这是生殖系多能性程序的标志性特征。Piwi样Agos和Vasa解旋酶的缺乏提示了一个问题:这些扁形虫的种系如何承受TE的动员?在这里,我们提出了一个解释机制可能捍卫生殖系完整的寄生扁形虫。
Surveillance by RNA interference is central to controlling the mobilization of transposable elements (TEs). In stem cells, Piwi argonaute (Ago) proteins and associated proteins repress mobilization of TEs to maintain genome integrity. This defense mechanism targeting TEs is termed the Piwi-interacting RNA (Piwi-piRNA) pathway. In this Opinion, we draw attention to the situation that the genomes of cestodes and trematodes have lost the piwi and vasa genes that are hallmark characters of the germline multipotency program. This absence of Piwi-like Agos and Vasa helicases prompts the question: how does the germline of these flatworms withstand mobilization of TEs? Here we present an interpretation of mechanisms likely to defend the germline integrity of parasitic flatworms.
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