By using the mini-gene construct containing partial sequence of Bcl-X gene as model, we examined the function of TPA on Bcl-X pre-mRNA alternative splicing in vivo and vitro with RT-PCR and site-directed mutagesis assay. The results show that PKA signaling system can regulate Bcl-X pre-mRNA alternative splicing, the possible mechanism is that the responsible sequence affect the choice of the 5'-downstream or upstream splice site of Bcl-X pre-mRNA.
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