Transposon-mediated targeted and specific knockdown of maternally expressed transcripts in the ascidian Ciona intestinalis.

Transposon-mediated targeted and specific knockdown of maternally expressed transcripts in the ascidian Ciona intestinalis.
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DOI:
10.1038/srep05050
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发表时间:
2014-05-23
期刊:
影响因子:
4.6
通讯作者:
Sasakura Y
Sasakura Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Iitsuka T;Mita K;Hozumi A;Hamada M;Satoh N;Sasakura Y

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母体mRNAs在海鞘动物早期胚胎发育过程中起着至关重要的作用,但其功能目前尚不清楚。在这项研究中,我们开发了一种新的方法,利用转座子介导的转基因来特异性地敲除肠道黄瓜中的母体mRNA。我们发现在海鞘卵母细胞和卵中GFP的表达在表观遗传上是沉默的,这种表观遗传沉默被用来开发基因敲除方法。当母体基因的5‘上游启动子和5’非翻译区被用来驱动卵子中的GFP时,母体基因与GFP一起被特异性地敲除。母体基因的5‘非编码区是决定靶基因沉默的主要因素。目的基因的合子转录不受影响,表明观察到的表型特异性地反映了该基因的母体功能。这一新方法可以为研究母体mRNAs的功能提供突破。
Maternal mRNAs play crucial roles during early embryogenesis of ascidians, but their functions are largely unknown. In this study, we developed a new method to specifically knockdown maternal mRNAs in Ciona intestinalis using transposon-mediated transgenesis. We found that GFP expression is epigenetically silenced in Ciona intestinalis oocytes and eggs, and this epigenetic silencing of GFP was used to develop the knockdown method. When the 5′ upstream promoter and 5′ untranslated region (UTR) of a maternal gene are used to drive GFP in eggs, the maternal gene is specifically knocked down together with GFP. The 5′ UTR of the maternal gene is the major element that determines the target gene silencing. Zygotic transcription of the target gene is unaffected, suggesting that the observed phenotypes specifically reflect the maternal function of the gene. This new method can provide breakthroughs in studying the functions of maternal mRNAs.
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