Betaine rescue of an animal model with methylenetetrahydrofolate reductase deficiency

Bernd C. Schwahn, Maurice D. Laryea, Zhoutao Chen, Stepan Melnyk, Igor Pogribny, Timothy Garrow, S. Jill James, Rima Rozen

Research output: Contribution to journalArticlepeer-review


MTHFR (methylenetetrahydrofolate reductase) catalyses the synthesis of 5-methyltetrahydrofolate, the folate derivative utilized in homocysteine remethylation to methionine. A severe deficiency of MTHFR results in hyperhomocysteinaemia and homocystinuria. Betaine supplementation has proven effective in ameliorating the biochemical abnormalities and the clinical course in patients with this deficiency. Mice with a complete knockout of MTHFR serve as a good animal model for homocystinuria; early postnatal death of these mice is common, as with some neonates with low residual MTHFR activity. We attempted to rescue Mthfr-/- mice from postnatal death by betaine supplementation to their mothers throughout pregnancy and lactation. Betaine decreased the mortality of Mthfr-/- mice from 83% to 26% and significantly improved somatic development from postnatal day 1, compared with Mthfr-/- mice from unsupplemented dams. Biochemical evaluations demonstrated higher availability of betaine in suckling pups, decreased accumulation of homocysteine, and decreased flux through the trans-sulphuration pathway in liver and brain of Mthfr-/- pups from betaine-supplemented dams. We observed disturbances in proliferation and differentiation in the cerebellum and hippocampus in the knockout mice; these changes were ameliorated by betaine supplementation. The dramatic effects of betaine on survival and growth, and the partial reversibility of the biochemical and developmental anomalies in the brains of MTHFR-deficient mice, emphasize an important role for choline and betaine depletion in the pathogenesis of homocystinuria due to MTHFR deficiency.

Original languageEnglish (US)
Pages (from-to)831-840
Number of pages10
JournalBiochemical Journal
Issue number3
StatePublished - Sep 15 2004


  • Betaine supplementation
  • Brain development
  • Hyperhomocysteinaemia
  • Methylenetetrahydrofolate reductase (MTHFR)
  • Remethylation

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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