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A complex gene regulatory mechanism that operates at the nexus of multiple RNA processing decisions.

Nat Struct Mol Biol. 2009 Mar;16(3):255-64. Epub 2009 Feb 08
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摘要


Expression of crs1 pre-mRNA, encoding a meiotic cyclin, is blocked in actively growing fission yeast cells by a multifaceted mechanism. The most striking feature is that in vegetative cells, crs1 transcripts are continuously synthesized but are targeted for degradation rather than splicing and polyadenylation. Turnover of crs1 RNA requires the exosome, as do previously described nuclear surveillance and silencing mechanisms, but does not involve a noncanonical poly(A) polymerase. Instead, crs1 transcripts are targeted for destruction by a factor previously implicated in turnover of meiotic RNAs in growing cells. Like exosome mutants, mmi1 mutants splice and polyadenylate vegetative crs1 transcripts. Two regulatory elements are located at the 3' end of the crs1 gene, consistent with the increased accumulation of spliced RNA in polyadenylation factor mutants. This highly integrated regulatory strategy may ensure a rapid response to adverse conditions, thereby guaranteeing survival.

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基因功能


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