Journal
NUCLEIC ACIDS RESEARCH
Volume 47, Issue 12, Pages 6160-6171Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nar/gkz344
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Funding
- Italian Ministry of Health 'Ricerca Finalizata 2011' [GR-2011-02348423]
- Associazione Italiana Ricerca sul Cancro (AIRC) [IG18790]
- Ricerca Finalizzata 2016 [RF-2016-02363460]
- Italian Ministry of Health Ricerca Corrente
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The splicing factor Sam68 is upregulated in many human cancers, including prostate cancer (PCa) where it promotes cell proliferation and survival. Nevertheless, in spite of its frequent upregulation in cancer, the mechanism(s) underlying its expression are largely unknown. Herein, bioinformatics analyses identified the promoter region of the Sam68 gene (KHDRBS1) and the proto-oncogenic transcription factor c-MYC as a key regulator of Sam68 expression. Upregulation of Sam68 and c-MYC correlate in PCa patients. c-MYC directly binds to and activates the Sam68 promoter. Furthermore, c-MYC affects productive splicing of the nascent Sam68 transcript by modulating the transcriptional elongation rate within the gene. Importantly, c-MYC-dependent expression of Sam68 is under the tight control of external cues, such as androgens and/or mitogens. These findings uncover an unexpected coordination of transcription and splicing of Sam68 by c-MYC, which may represent a key step in PCa tumorigenesis.
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