rdf:type |
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lifeskim:mentions |
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pubmed:issue |
13
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pubmed:dateCreated |
2011-7-25
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pubmed:abstractText |
Human RNA polymerase (Pol) III-transcribed genes are thought to share a simple termination signal constituted by four or more consecutive thymidine residues in the coding DNA strand, just downstream of the RNA 3'-end sequence. We found that a large set of human tRNA genes (tDNAs) do not display any T(?4) stretch within 50?bp of 3'-flanking region. In vitro analysis of tDNAs with a distanced T(?4) revealed the existence of non-canonical terminators resembling degenerate T(?5) elements, which ensure significant termination but at the same time allow for the production of Pol III read-through pre-tRNAs with unusually long 3' trailers. A panel of such non-canonical signals was found to direct transcription termination of unusual Pol III-synthesized viral pre-miRNA transcripts in gammaherpesvirus 68-infected cells. Genome-wide location analysis revealed that human Pol III tends to trespass into the 3'-flanking regions of tDNAs, as expected from extensive terminator read-through. The widespread occurrence of partial termination suggests that the Pol III primary transcriptome in mammals is unexpectedly enriched in 3'-trailer sequences with the potential to contribute novel functional ncRNAs.
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pubmed:language |
eng
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pubmed:journal |
|
pubmed:citationSubset |
IM
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pubmed:chemical |
|
pubmed:status |
MEDLINE
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pubmed:month |
Jul
|
pubmed:issn |
1362-4962
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pubmed:author |
pubmed-author:DiebelKevin WKW,
pubmed-author:DieciGiorgioG,
pubmed-author:HernandezNouriaN,
pubmed-author:OrioliAndreaA,
pubmed-author:PascaliChiaraC,
pubmed-author:PercudaniRiccardoR,
pubmed-author:PrazVivianeV,
pubmed-author:QuartararoJadeJ,
pubmed-author:RomascanoDavidD,
pubmed-author:TeichmannMartinM,
pubmed-author:van DykLinda FLF
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pubmed:issnType |
Electronic
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pubmed:volume |
39
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
5499-512
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pubmed:meshHeading |
pubmed-meshheading:21421562-3' Flanking Region,
pubmed-meshheading:21421562-Animals,
pubmed-meshheading:21421562-Cell Line,
pubmed-meshheading:21421562-HeLa Cells,
pubmed-meshheading:21421562-Humans,
pubmed-meshheading:21421562-Mice,
pubmed-meshheading:21421562-RNA, Transfer,
pubmed-meshheading:21421562-RNA Polymerase III,
pubmed-meshheading:21421562-Sequence Analysis, DNA,
pubmed-meshheading:21421562-Terminator Regions, Genetic,
pubmed-meshheading:21421562-Transcription, Genetic
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pubmed:year |
2011
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pubmed:articleTitle |
Widespread occurrence of non-canonical transcription termination by human RNA polymerase III.
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pubmed:affiliation |
Dipartimento di Biochimica e Biologia Molecolare, Università degli Studi di Parma, Viale G.P. Usberti 23/A, 43100 Parma, Italy.
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pubmed:publicationType |
Journal Article
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