Spt6 enhances the elongation rate of RNA polymerase II in vivo |
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| Authors: | M Behfar Ardehali Karen Adelman Nicholas J Fuda Steven J Petesch Watt W Webb John T Lis |
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| Affiliation: | 1. Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA;2. Laboratory of Molecular Carcinogenesis, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA;3. School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA |
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| Abstract: | Several eukaryotic transcription factors have been shown to modulate the elongation rate of RNA polymerase II (Pol II) on naked or chromatin‐reconstituted templates in vitro. However, none of the tested factors have been shown to directly affect the elongation rate of Pol II in vivo. We performed a directed RNAi knock‐down (KD) screen targeting 141 candidate transcription factors and identified multiple factors, including Spt6, that alter the induced Hsp70 transcript levels in Drosophila S2 cells. Spt6 is known to interact with both nucleosome structure and Pol II, and it has properties consistent with having a role in elongation. Here, ChIP assays of the first wave of Pol II after heat shock in S2 cells show that KD of Spt6 reduces the rate of Pol II elongation. Also, fluorescence recovery after photobleaching assays of GFP‐Pol II in salivary gland cells show that this Spt6‐dependent effect on elongation rate persists during steady‐state‐induced transcription, reducing the elongation rate from ～1100 to 500 bp/min. Furthermore, RNAi depletion of Spt6 reveals its broad requirement during different stages of development. |
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| Keywords: | elongation rate hsp70 pol II spt6 transcription elongation |
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