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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Regulation of the Alternative Splicing and Function of Cyclin T1 by the Serine-Arginine-Rich Protein ASF/SF2.
Journal of Cellular Biochemistry 2017 November
Positive transcription elongation factor-b (P-TEFb) is required for the release of RNA polymerase II (RNAPII) from its pause near the gene promoters and thus for efficient proceeding to the transcription elongation. It consists of two core subunits-CDK9 and one of T-typed or K-typed cyclin, of which, cyclin T1/CDK9 is the major and most studied combination. We have previously identified a novel splice variant of cyclin T1, cyclin T1b, which negatively regulates the transcription elongation of HIV-1 genes as well as several host genes. In this study, we revealed the serine-arginine-rich protein, ASF/SF2, as a regulatory factor of the alternative splicing of cyclin T1 gene. ASF/SF2 promotes the production of cyclin T1b versus cyclin T1a and regulates the expression of cyclin T1-depedent genes at the transcription level. We further found that a cis-element on exon 8 is responsible for the skipping of exon 7 mediated by ASF/SF2. Collectively, ASF/SF2 is identified as a splicing regulator of cyclin T1, which contributes to the control of the subsequent transcription events. J. Cell. Biochem. 118: 4020-4032, 2017. © 2017 Wiley Periodicals, Inc.
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