Persistent hypermethioninaemia with dominant inheritance

H. J. Blom, A. J. Davidson, J. D. Finkelstein, A. S. Luder, I. Bernardini, J. J. Martin, A. Tangerman, J. M.F. Trijbels, S. H. Mudd, S. I. Goodman, W. A. Gahl

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21 Scopus citations

Abstract

A clinically benign form of persistent hypermethioninaemia with probable dominant inheritance was demonstrated in three generations of one family. Plasma methionine concentrations were between 87 and 475 μmol/L (normal mean 26 μmol/L; range 10-40 μmol/L); urinary methionine and homocystine concentrations were normal. Plasma homocystine, cystathionine, cystine and tyrosine were virtually normal. The concentrations in serum and urine of metabolites formed by the methionine transamination pathway were normal or moderately elevated. Methionine loading of two affected family members revealed a diminished ability to catabolize methionine, but the activities of methionine adenosyltransferase and cystathionine β-synthase were not decreased in fibroblasts from four affected family members. Fibroblast methylenetetrahydrofolate reductase activity and its inhibition by S-adenosylmethionine were also normal, indicating normal regulation of N5-methyltetrahydrofolate-dependent homocysteine remethylation. Serum folate concentrations were not increased. The findings in this family differ from those previously described for known defects of methionine degradation. Since the hepatic and fibroblast isoenzymes of methionine adenosyltransferase differ in their genetic control, this family's biochemical findings appear consistent with a mutation in the structural gene for the hepatic methionine adenosyltransferase isoenzyme.

Original languageEnglish
Pages (from-to)188-197
Number of pages10
JournalJournal of Inherited Metabolic Disease
Volume15
Issue number2
DOIs
StatePublished - Mar 1992
Externally publishedYes

Funding

FundersFunder number
National Institute of Diabetes and Digestive and Kidney DiseasesR01DK013048

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