5,10-methylenetetrahydrofolate reductase (MTHFR) polymorphisms and the risk of acute lymphoblastic leukemia (ALL) in Filipino children

Pediatric Blood & Cancer
Patricia AlcasabasR B Everson

Abstract

5,10-Methylenetetrahydrofolate reductase (MTHFR) is a critical enzyme in folate metabolism. Polymorphisms at the C677T and A1298C loci are associated with reduced activity; consequently more folate substrates are shunted toward thymidylate and DNA synthesis. Several studies have reported a reduced risk of developing ALL in children with MTHFR polymorphisms. The objective of this study was to determine the association between MTHFR polymorphisms and ALL in Filipino children. We conducted a case control study in children diagnosed with ALL at the Philippine General Hospital from 1/2001 through 12/2005. Bone marrow aspirate slides were reviewed by two expert hematologists to verify the morphologic diagnosis of ALL. DNA was isolated from the slides and MTHFR polymorphisms, C677T and A1298C, were determined using Taqman real-time PCR. Cord blood of healthy Filipino newborns served as control. There were a total of 191 ALL and 394 controls genotyped. The distribution of C677T polymorphisms was similar in the two groups (P = 1.0). However, for A1298C, there was significantly more AC and CC genotypes in the ALL compared to controls (P = 0.02; OR 1.57; CI: 1.08-2.28). The 1298C allele frequency for the control group was 36.8% and 677T a...Continue Reading

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