"Jump start and gain" model for dosage compensation in Drosophila based on direct sequencing of nascent transcripts.

Cell Rep 2013 Nov 31;5(3):629-36. Epub 2013 Oct 31.

Center for Biomedical Informatics, Harvard Medical School, Boston, MA 02115, USA.

Dosage compensation in Drosophila is mediated by the MSL complex, which increases male X-linked gene expression approximately 2-fold. The MSL complex preferentially binds the bodies of active genes on the male X, depositing H4K16ac with a 3' bias. Two models have been proposed for the influence of the MSL complex on transcription: one based on promoter recruitment of RNA polymerase II (Pol II), and a second featuring enhanced transcriptional elongation. Here, we utilize nascent RNA sequencing to document dosage compensation during transcriptional elongation. We also compare X and autosomes from published data on paused and elongating polymerase in order to assess the role of Pol II recruitment. Our results support a model for differentially regulated elongation, starting with release from 5' pausing and increasing through X-linked gene bodies. Our results highlight facilitated transcriptional elongation as a key mechanism for the coordinated regulation of a diverse set of genes.

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http://dx.doi.org/10.1016/j.celrep.2013.09.037DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3852897PMC
November 2013
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