Myb: an old oncoprotein with new roles

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• The c-myb gene and its protein product, Myb, are crucial transcription factors in hemopoietic tissues.
• Myb's role in regulating cell cycling, proliferation, and differentiation is well-established.
• Directly identifying Myb-controlled genes and their functional impact has been challenging.

Purpose of the Study:

• To investigate the direct targets of the Myb transcription factor.
• To understand the mechanisms by which Myb influences cellular processes.
• To explore the role of c-myb in non-hemopoietic tissues.

Main Methods:

• Analysis of genes with Myb recognition sequences in their promoters.
• Mutagenesis studies to define Myb protein domains affecting transcriptional activity.
• Examination of c-myb expression in various normal and malignant tissues.

Main Results:

• Genes with Myb recognition sequences have been identified.
• A direct proliferative response to Myb via these target genes remains to be demonstrated.
• Understanding of Myb protein interactions and its role in non-hemopoietic tissues is emerging.

Conclusions:

• While Myb's regulatory functions are known, its direct gene targets and mechanisms are still under investigation.
• Further research is needed to confirm Myb's direct proliferative effects through identified target genes.
• c-myb appears to play a significant role in the proliferation, differentiation, and transformation of non-hemopoietic tissues, analogous to its role in hemopoietic tissues.