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Published on: September 20, 2016
Lung cancer risk and variation in MGMT activity and sequence
Andrew C Povey1, Geoffrey P Margison, Mauro F Santibáñez-Koref
1Centre for Occupational and Environmental Health, University of Manchester, United Kingdom. a.povey@manchester.ac.uk
DNA Repair
|June 16, 2007
Summary
Inter-individual differences in O(6)-Alkylguanine-DNA alkyltransferase (MGMT) activity influence lung cancer risk. The R178 allele may be associated with lower lung cancer risk in individuals exposed to carcinogens.
Area of Science:
- Molecular biology
- Genetics
- Cancer research
Background:
- O(6)-Alkylguanine-DNA alkyltransferase (MGMT) is crucial for repairing DNA damage caused by alkylating agents, including tobacco-specific nitrosamines.
- Inter-individual variability in MGMT expression and activity exists in human lung tissues.
- This variability may impact susceptibility to lung cancer, as demonstrated in animal models where MGMT absence increases cancer risk and overexpression is protective.
Purpose of the Study:
- To review research on inter-individual differences in MGMT expression and their potential influence on lung cancer risk.
- To investigate the association between MGMT polymorphisms and lung cancer susceptibility.
- To analyze case-control studies for evidence linking specific MGMT alleles to lung cancer risk.
Main Methods:
- Review of existing research on MGMT function and DNA repair.
- Analysis of human lung tissue for DNA damage and MGMT activity variations.
- Examination of genetic polymorphisms affecting MGMT activity and expression.
- Statistical analysis of case-control studies investigating MGMT polymorphisms and lung cancer risk.
Main Results:
- Significant inter-individual differences in DNA damage (N7-methylguanine) and MGMT activity were observed in human lung tissues.
- Genetic polymorphisms in MGMT have been identified, influencing protein activity and expression levels.
- Previous studies on MGMT polymorphisms and cancer risk have yielded inconsistent results.
- Recent case-control studies suggest a lower lung cancer risk in subjects carrying the R178 allele.
Conclusions:
- Inter-individual variability in MGMT activity plays a role in modulating lung cancer risk, particularly in the context of exposure to alkylating agents.
- Specific MGMT polymorphisms, such as the R178 allele, may offer a protective effect against lung cancer.
- Further research with larger sample sizes and standardized methodologies is needed to clarify the inconsistent associations between MGMT polymorphisms and lung cancer risk.
