Gene loops enhance transcriptional directionality.

Gene loops enhance transcriptional directionality.
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DOI:
10.1126/science.1224350
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发表时间:
2012-11-02
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Proudfoot NJ
Proudfoot NJ
中科院分区:
其他
文献类型:
--
作者:
Tan-Wong SM;Zaugg JB;Camblong J;Xu Z;Zhang DW;Mischo HE;Ansari AZ;Luscombe NM;Steinmetz LM;Proudfoot NJ

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Eukaryotic genomes are extensively transcribed, forming both messenger (m) and noncoding (nc) RNAs. ncRNAs made by RNA polymerase II (Pol II) often initiate from bidirectional promoters (nucleosome-depleted chromatin) that synthesise mRNA and ncRNA in opposite directions. We demonstrate that actively transcribed mRNA encoding genes by adopting a gene loop conformation, restrict divergent transcription of ncRNAs. Since gene loop formation depends on a protein factor (Ssu72) that co-associates with both promoter and terminator, its inactivation leads to increased synthesis of promoter-associated divergent ncRNAs, referred to as Ssu72 restricted transcripts (SRT). Similarly, inactivation of individual gene loops by gene mutation enhances SRT synthesis. We demonstrate that gene loop conformation enforces transcriptional directionality on otherwise bidirectional promoters.
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