The Argonaute CSR-1 and its 22G-RNA cofactors are required for holocentric chromosome segregation.

The Argonaute CSR-1 and its 22G-RNA cofactors are required for holocentric chromosome segregation.
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DOI:
10.1016/j.cell.2009.09.014
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发表时间:
2009-10-02
期刊:
影响因子:
64.5
通讯作者:
Mello CC
Mello CC
中科院分区:
生物学1区
文献类型:
--
作者:
Claycomb JM;Batista PJ;Pang KM;Gu W;Vasale JJ;van Wolfswinkel JC;Chaves DA;Shirayama M;Mitani S;Ketting RF;Conte D Jr;Mello CC

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rnai相关通路调节多种过程,从发育时序到转座子沉默。本研究表明,在秀丽隐杆线虫中,Argonaute CSR-1、RNA依赖性RNA聚合酶EGO-1、dicer相关解旋酶DRH-3和都铎结构域蛋白EKL-1定位于染色体上,是染色体分离所必需的。在缺乏这些因素的情况下,染色体不能在中期板上排列,着丝点不能朝向相反的纺锤极。令人惊讶的是,CSR-1相互作用的小rna (22g - rna)对数千种种系表达的蛋白质编码基因是反义的。线虫组装全新中心染色体,其中连续的着丝点必须跨越基因组的表达域。我们发现CSR-1与靶位点的染色质相互作用,但不下调靶mRNA或蛋白水平。相反,我们的研究结果支持一种模型,即CSR-1复合物靶向蛋白质编码域,以促进它们在线虫全新中心染色体内的适当组织。
RNAi-related pathways regulate diverse processes, from developmental timing to transposon silencing. Here, we show that in C. elegans the Argonaute CSR-1, the RNA-dependent RNA polymerase EGO-1, the Dicer-related helicase DRH-3, and the Tudor-domain protein EKL-1 localize to chromosomes and are required for proper chromosome segregation. In the absence of these factors chromosomes fail to align at the metaphase plate and kinetochores do not orient to opposing spindle poles. Surprisingly, the CSR-1 interacting small RNAs (22G-RNAs) are antisense to thousands of germline-expressed protein-coding genes. Nematodes assemble holocentric chromosomes in which continuous kinetochores must span the expressed domains of the genome. We show that CSR-1 interacts with chromatin at target loci, but does not down-regulate target mRNA or protein levels. Instead, our findings support a model in which CSR-1 complexes target protein-coding domains to promote their proper organization within the holocentric chromosomes of C. elegans.
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