Journal
MOLECULAR CELL
Volume 17, Issue 3, Pages 429-439Publisher
CELL PRESS
DOI: 10.1016/j.molcel.2004.12.025
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Funding
- NIDDK NIH HHS [DK59820] Funding Source: Medline
- NIGMS NIH HHS [GM38526, GM58109] Funding Source: Medline
- PHS HHS [08818] Funding Source: Medline
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Increasing evidence indicates that transcription and pre-mRNA processing are functionally coupled to modulate gene expression. Here, we report that two members of the U2AF(65) family of proteins, hCC1.3, which we call CAPERalpha, and a related protein, CAPERbeta, regulate both steroid hormone receptor-mediated transcription and alternative splicing. The CAPER proteins coactivate the progesterone receptor in luciferase transcription reporter assays and alter alternative splicing of a calcitonin/calcitonin gene-related peptide minigene in a hormone-dependent manner. The importance of CAPER coactivators in the regulation of alternative RNA splicing of an endogenous cellular gene (VEGF) was substantiated by siRNA knockdown of CAPERalpha. Mutational analysis of CAPERbeta indicates that the transcriptional and splicing functions are located in distinct and separable domains of the protein. These results indicate that steroid hormone receptor-regulated transcription and pre-mRNA splicing can be directly linked through dual function coactivator molecules such as CAPERalpha and CAPERbeta.
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