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Expression of yeast O6-methylguanine-DNA methyltransferase (MGMT) gene
Abstract:
We cloned the full genomic DNA of yeast (Saccharomyces cerevisiae) O6-methylguanine-DNA methyltransferase (MGMT) gene and examined its expression. The expression of yeast MGMT gene is decreased when cells reach stationary phase and cannot be induced by the pretreatment with alkylating agents, methylmethanesulfonate (MMS) or N-methyl-N'-nitroso-N-nitrosoguanidine (MNNG). The transcription initiation site was determined by primer extension analysis. This analysis showed that the authentic start codon is the ATG at position +32 from transcription initiation site.
Insights
We cloned and studied the yeast O6-methylguanine-DNA methyltransferase (MGMT) gene. Its expression decreases in stationary phase and is not induced by common alkylating agents like MMS or MNNG.
Area of Science:
- Molecular Biology
- Yeast Genetics
- DNA Repair Mechanisms
Background:
- O6-methylguanine-DNA methyltransferase (MGMT) is crucial for repairing DNA alkylation damage.
- Understanding MGMT gene regulation in yeast (Saccharomyces cerevisiae) provides insights into DNA repair pathways.
Purpose of the Study:
- To clone and characterize the Saccharomyces cerevisiae MGMT gene.
- To investigate the expression patterns and regulation of yeast MGMT.
- To identify the transcription initiation site and authentic start codon of the yeast MGMT gene.
Main Methods:
- Full genomic DNA cloning of the yeast MGMT gene.
- Analysis of gene expression under different growth phases.
- Treatment with alkylating agents methylmethanesulfonate (MMS) and N-methyl-N'-nitroso-N-nitrosoguanidine (MNNG).
- Primer extension analysis to determine transcription initiation site.
Main Results:
- Yeast MGMT gene expression decreases as cells enter the stationary phase.
- Expression of the yeast MGMT gene cannot be induced by MMS or MNNG pretreatment.
- The authentic start codon (ATG) is located at position +32 relative to the transcription initiation site.
Conclusions:
- Yeast MGMT expression is downregulated during stationary phase.
- The yeast MGMT gene is not subject to induction by common alkylating agents.
- Precise identification of the transcription start site and authentic start codon for yeast MGMT.