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High-frequency promoter firing links THO complex function to heavy chromatin formation.

TitleHigh-frequency promoter firing links THO complex function to heavy chromatin formation.
Publication TypeJournal Article
Year of Publication2013
AuthorsMouaikel, J, Causse, SZ, Rougemaille, M, Daubenton-Carafa, Y, Blugeon, C, Lemoine, S, Devaux, F, Darzacq, X, Libri, D
JournalCell Rep
Date Published2013 Nov 27
KeywordsChromatin, DNA-Binding Proteins, Gene Expression Regulation, Fungal, Heat-Shock Proteins, Heat-Shock Response, Nuclear Pore, Nuclear Proteins, Promoter Regions, Genetic, Ribonucleoproteins, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Transcription Factors, Transcription, Genetic

The THO complex is involved in transcription, genome stability, and messenger ribonucleoprotein (mRNP) formation, but its precise molecular function remains enigmatic. Under heat shock conditions, THO mutants accumulate large protein-DNA complexes that alter the chromatin density of target genes (heavy chromatin), defining a specific biochemical facet of THO function and a powerful tool of analysis. Here, we show that heavy chromatin distribution is dictated by gene boundaries and that the gene promoter is necessary and sufficient to convey THO sensitivity in these conditions. Single-molecule fluorescence in situ hybridization measurements show that heavy chromatin formation correlates with an unusually high firing pace of the promoter with more than 20 transcription events per minute. Heavy chromatin formation closely follows the modulation of promoter firing and strongly correlates with polymerase occupancy genome wide. We propose that the THO complex is required for tuning the dynamic of gene-nuclear pore association and mRNP release to the same high pace of transcription initiation.

Alternate JournalCell Rep
PubMed ID24210826

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