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Active RNA polymerases: mobile or immobile molecular machines?


ABSTRACT: It is widely assumed that active RNA polymerases track along their templates to produce a transcript. We test this using chromosome conformation capture and human genes switched on rapidly and synchronously by tumour necrosis factor alpha (TNFalpha); one is 221 kbp SAMD4A, which a polymerase takes more than 1 h to transcribe. Ten minutes after stimulation, the SAMD4A promoter comes together with other TNFalpha-responsive promoters. Subsequently, these contacts are lost as new downstream ones appear; contacts are invariably between sequences being transcribed. Super-resolution microscopy confirms that nascent transcripts (detected by RNA fluorescence in situ hybridization) co-localize at relevant times. Results are consistent with an alternative view of transcription: polymerases fixed in factories reel in their respective templates, so different parts of the templates transiently lie together.

SUBMITTER: Papantonis A 

PROVIDER: S-EPMC2903595 | biostudies-literature | 2010 Jul

REPOSITORIES: biostudies-literature

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Active RNA polymerases: mobile or immobile molecular machines?

Papantonis Argyris A   Larkin Joshua D JD   Wada Youichiro Y   Ohta Yoshihiro Y   Ihara Sigeo S   Kodama Tatsuhiko T   Cook Peter R PR  

PLoS biology 20100713 7


It is widely assumed that active RNA polymerases track along their templates to produce a transcript. We test this using chromosome conformation capture and human genes switched on rapidly and synchronously by tumour necrosis factor alpha (TNFalpha); one is 221 kbp SAMD4A, which a polymerase takes more than 1 h to transcribe. Ten minutes after stimulation, the SAMD4A promoter comes together with other TNFalpha-responsive promoters. Subsequently, these contacts are lost as new downstream ones app  ...[more]

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