Abstract:
:The particular behaviour of eukaryotic RNA polymerases along different gene regions and amongst distinct gene functional groups is not totally understood. To cast light onto the alternative active or backtracking states of RNA polymerase II, we have quantitatively mapped active RNA polymerases at a high resolution following a new biotin-based genomic run-on (BioGRO) technique. Compared with conventional profiling with chromatin immunoprecipitation, the analysis of the BioGRO profiles in Saccharomyces cerevisiae shows that RNA polymerase II has unique activity profiles at both gene ends, which are highly dependent on positioned nucleosomes. This is the first demonstration of the in vivo influence of positioned nucleosomes on transcription elongation. The particular features at the 5' end and around the polyadenylation site indicate that this polymerase undergoes extensive specific-activity regulation in the initial and final transcription elongation phases. The genes encoding for ribosomal proteins show distinctive features at both ends. BioGRO also provides the first nascentome analysis for RNA polymerase III, which indicates that transcription of tRNA genes is poorly regulated at the individual copy level. The present study provides a novel perspective of the transcription cycle that incorporates inactivation/reactivation as an important aspect of RNA polymerase dynamics.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Jordán-Pla A,Gupta I,de Miguel-Jiménez L,Steinmetz LM,Chávez S,Pelechano V,Pérez-Ortín JEdoi
10.1093/nar/gku1349subject
Has Abstractpub_date
2015-01-01 00:00:00pages
787-802issue
2eissn
0305-1048issn
1362-4962pii
gku1349journal_volume
43pub_type
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