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Folate metabolic gene polymorphisms and childhood acute lymphoblastic leukemia: a case-control study
1Division of Molecular Genetic Epidemiology, German Cancer Research Center, Heidelberg, Germany.
Leukemia
|December 1, 2006
Summary
Genetic variations in the 5-methyltetrahydrofolate-homocysteine methyltransferase reductase (MTRR) gene are linked to childhood acute lymphoblastic leukemia (ALL) risk. Specific MTRR haplotypes show significant associations with altered ALL risk in children.
Area of Science:
- Genetics
- Molecular Biology
- Pediatric Oncology
Background:
- Folate metabolism plays a crucial role in DNA synthesis and repair, processes vital for preventing cancer development.
- Genetic variations in folate pathway genes may influence susceptibility to various cancers, including childhood acute lymphoblastic leukemia (ALL).
- The 5-methyltetrahydrofolate-homocysteine methyltransferase reductase (MTRR) gene is a key enzyme in the folate pathway.
Purpose of the Study:
- To investigate the association between polymorphisms in folate metabolic pathway genes and the risk of childhood acute lymphoblastic leukemia (ALL).
- To specifically examine the role of the 5-methyltetrahydrofolate-homocysteine methyltransferase reductase (MTRR) gene and its haplotypes in childhood ALL susceptibility.
Main Methods:
- Genotyping of 11 polymorphisms across six folate metabolic pathway genes in 460 childhood ALL cases and 552 controls.
- Statistical analysis including gender-adjusted global P-values, multiple-testing correction, and haplotype distribution analysis.
- Genotype-combination analyses were performed to identify the best predictive model for ALL risk.
Main Results:
- The 66A>G (I22M) polymorphism in the MTRR gene showed a marginal association with decreased ALL risk (P=0.03).
- Significant differences in MTRR haplotype distributions were observed between ALL cases and controls (P<0.0001).
- Specific MTRR haplotypes (GCAC, ATAC) were associated with reduced risk, while others (ACAC, GTAC) were linked to increased risk.
Conclusions:
- While the 66A>G polymorphism in MTRR shows a weak association, MTRR gene haplotypes appear to significantly influence childhood ALL risk.
- These findings suggest that variations within the MTRR gene may contribute to population-based differences in childhood ALL susceptibility.
- Further research into folate metabolism gene polymorphisms and their role in pediatric leukemia is warranted.
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