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Published on: March 23, 2012
Myc and Max homologs in Drosophila
P Gallant1, Y Shiio, P F Cheng
1Division of Basic Sciences, Fred Hutchinson Cancer Research Center, 1124 Columbia Street, Seattle WA 98104, USA.
Abstract:
The proteins encoded by the myc proto-oncogene family are involved in cell proliferation, apoptosis, differentiation, and neoplasia. Myc acts through dimerization with Max to bind DNA and activate transcription. Homologs of the myc and max genes were cloned from the fruit fly Drosophila melanogaster and their protein products (dMyc and dMax) were shown to heterodimerize, recognize the same DNA sequence as their vertebrate homologs, and activate transcription. The dMyc protein is likely encoded by the Drosophila gene diminutive (dm), a mutation in which results in small body size and female sterility caused by degeneration of the ovaries. These findings indicate a potential role for Myc in germ cell development and set the stage for genetic analysis of Myc and Max.
Insights
Researchers identified fruit fly homologs of the myc and max genes, demonstrating their conserved function in DNA binding and transcription activation. This suggests a role for Myc in germ cell development, paving the way for genetic studies.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- The myc proto-oncogene family proteins regulate critical cellular processes like proliferation, apoptosis, and differentiation.
- Myc proteins function by dimerizing with Max, enabling DNA binding and transcriptional activation.
Purpose of the Study:
- To investigate the presence and function of myc and max gene homologs in Drosophila melanogaster.
- To explore the potential role of Myc in germ cell development.
Main Methods:
- Cloning of myc and max gene homologs from Drosophila melanogaster.
- Analysis of protein-protein interactions (heterodimerization) between dMyc and dMax.
- Assessment of DNA binding specificity and transcriptional activation capabilities.
Main Results:
- dMyc and dMax proteins were successfully cloned and shown to heterodimerize.
- These fly proteins recognize the same DNA sequence as their vertebrate counterparts.
- dMyc and dMax demonstrated transcriptional activation capabilities.
- The Drosophila gene diminutive (dm) was identified as the likely source of dMyc; mutations cause reduced body size and ovarian degeneration.
Conclusions:
- The conserved function of Myc and Max in Drosophila suggests a fundamental role in cellular regulation across species.
- The link between the diminutive gene mutation and ovarian defects highlights a potential role for Myc in germ cell development.
- These findings establish a foundation for genetic investigations into Myc and Max function in Drosophila.
