The transcription factor c-Myb affects pre-mRNA splicing

Area of Science:

• Molecular Biology
• Gene Regulation
• RNA Splicing

Background:

• c-Myb is a crucial transcription factor in hematopoietic cell development.
• Its known function involves transcriptional activation.
• The potential role of c-Myb in RNA processing remains largely unexplored.

Purpose of the Study:

• To investigate if c-Myb possesses functions beyond transcriptional activation.
• To determine the influence of c-Myb on alternative pre-mRNA splicing.
• To explore the molecular interactions between c-Myb and the splicing machinery.

Main Methods:

• Utilized reporter assays to study alternative splicing of E1A pre-mRNA.
• Assessed the effect of c-Myb on 5' and 3' splice site selection.
• Performed co-immunoprecipitation to identify interactions with splicing factors.
• Examined the impact of the oncogenic v-Myb variant.

Main Results:

• c-Myb significantly affected 5' splice site selection during E1A alternative splicing.
• No effect was observed on 3' splice site selection or constitutive splicing.
• Co-immunoprecipitation revealed interactions between c-Myb, U2AF(65), and hnRNPA1.
• The oncogenic v-Myb variant failed to influence 5' splice site selection.

Conclusions:

• c-Myb plays a role in regulating alternative pre-mRNA splicing, particularly 5' splice site choice.
• Evidence suggests c-Myb interacts with key splicing factors like U2AF(65) and hnRNPA1.
• This finding points to a novel function of c-Myb in coupling transcription and splicing.
• The oncogenic v-Myb variant's inability to affect splicing highlights potential differences in function.