| Title | MTRR and MTHFR polymorphism: link to Down syndrome? | | Author(s) | O'Leary VB, Parle-McDermott A, Molloy AM, Kirke PN, Johnson Z, Conley M, Scott JM, Mills JL | | Institution | Department of Biochemistry, Trinity College, Dublin, Ireland. | | Source | Am J Med Genet 2002 Jan 15; 107(2):151-5. | | MeSH | Alleles
Case-Control Studies
Child
Down Syndrome
Female
Ferredoxin-NADP Reductase
Folic Acid
Gene Frequency
Genotype
Homocysteine
Humans
Methylenetetrahydrofolate Reductase (NADPH2)
Oxidoreductases Acting on CH-NH Group Donors
Polymorphism, Genetic
Research Support, Non-U.S. Gov't
Vitamin B 12
| | Abstract | Polymorphisms in genes encoding the folate metabolizing enzymes methylenetetrahydrofolate reductase (MTHFR C677T) and methionine synthase reductase (MTRR A66G) have been linked to the etiology of Down syndrome. We examined the prevalence of these variant genotypes in mothers who had given birth to a child with Down syndrome (n = 48) and in control mothers (n = 192), and investigated the biochemical factors influenced by the presence of MTRR A66G and MTHFR C677T. The frequency of the MTRR variant genotypes (AG, GG) was significantly higher in mothers of children with Down syndrome compared to controls (P = 0.0028). MTHFR C677T genotype frequencies were not significantly altered in mothers of children with Down syndrome (P = 0.74). However, mothers who had a MTHFR CT or TT genotype and a MTRR GG genotype had a 2.98-fold increased risk of having a child with Down syndrome (P = 0.02). The MTRR polymorphism did not increase plasma homocysteine. Higher homocysteine was found with the presence of the MTHFR T allele. In conclusion, MTRR A66G is significantly more common in mothers of children with Down syndrome but does not appear to increase the risk for Down syndrome by changing homocysteine metabolism. Women who have both the MTRR and MTHFR variant genotypes are also at increased risk of producing offspring with Down syndrome. | | Language | eng | | Pub Type(s) | Journal Article
| | PubMed ID | 11807890 |
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