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. 1995 Oct;57(4):882–892.

Isolated persistent hypermethioninemia.

S H Mudd 1, H L Levy 1, A Tangerman 1, C Boujet 1, N Buist 1, A Davidson-Mundt 1, L Hudgins 1, K Oyanagi 1, M Nagao 1, W G Wilson 1
PMCID: PMC1801505  PMID: 7573050

Abstract

New information has been obtained on 30 patients with isolated persistent hypermethioninemia, most of them previously unreported. Biopsies to confirm the presumptive diagnosis of partially deficient activity of ATP: L-methionine S-adenosyltransferase (MAT; E.C.2.5.1.6) in liver were not performed on most of these patients. However, none showed the clinical findings or the extreme elevations of serum folate previously described in other patients with isolated hypermethioninemia considered not to have hepatic MAT deficiency. Patients ascertained on biochemical grounds had no neurological abnormalities, and 27/30 had IQs or Bayley development-index scores within normal limits or were judged to have normal mental development. Methionine transamination metabolites accumulated abnormally only when plasma methionine concentrations exceeded 300-350 microM and did so more markedly after 0.9 years of age. Data were obtained on urinary organic acids as well as plasma creatinine concentrations. Patterns of inheritance of isolated hypermethioninemia were variable. Considerations as to the optimal management of this group of patients are discussed.

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Selected References

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