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A methylenetetrahydrofolate reductase polymorphism is associated with expression of p16 in human lung cancer
H Kamiya1, K Kawakami, T Miyanaga
1Department of Surgery I, Kanazawa University School of Medicine, Kanazawa 920-8641, Japan.
Abstract:
Methylenetetrahydrofolate reductase (MTHFR) is a critical enzyme in the folate cycle. Reduced MTHFR activity induces DNA hypomethylation and stability, which may protect the tumor suppressor gene p16INK4. We examined the association between MTHFR polymorphism and expression of p16INK4. The frequency of the MTHFR genotypes were 21 Ala/Ala, 29 Ala/Aal, and 7 Val/Val. Expression of p16INK4 was 26.2 +/- 26.8% in the Val/Val genotype and 11.2 +/- 16.6% in the other genotypes (p=0.46) as examined by immunostaining, and excluding four specimens that were overstained. These results suggest that folate metabolism can affect carcinogenesis through the expression of p16INK4.
Insights
Methylenetetrahydrofolate reductase (MTHFR) gene variants may influence cancer risk by affecting the expression of the p16INK4 tumor suppressor gene. Folate metabolism impacts carcinogenesis through p16INK4 regulation.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Methylenetetrahydrofolate reductase (MTHFR) is a key enzyme in folate metabolism.
- Reduced MTHFR activity is linked to DNA hypomethylation and stability.
- This epigenetic alteration may influence the expression of tumor suppressor genes like p16INK4.
Purpose of the Study:
- To investigate the association between MTHFR gene polymorphism and p16INK4 expression.
- To explore the role of folate metabolism in carcinogenesis via p16INK4.
Main Methods:
- Genotyping of MTHFR polymorphisms (Ala/Ala, Ala/Aal, Val/Val).
- Immunostaining to assess p16INK4 expression levels.
- Statistical analysis of genotype-specific p16INK4 expression.
Main Results:
- Observed frequencies for MTHFR genotypes: 21 Ala/Ala, 29 Ala/Aal, 7 Val/Val.
- p16INK4 expression was 26.2% in Val/Val genotype versus 11.2% in other genotypes (p=0.46).
- The observed difference in p16INK4 expression between genotypes was not statistically significant.
Conclusions:
- Folate metabolism, influenced by MTHFR activity, may play a role in cancer development.
- The study suggests a potential link between MTHFR variants and p16INK4 expression in carcinogenesis.
- Further research is needed to elucidate the precise mechanisms.