Persistent hypermethioninaemia with dominant inheritance

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 byS-adenosylmethionine were also normal, indicating normal regulation ofN 5-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.

DOI: 10.1007/BF01799629

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@article{Blom1992PersistentHW, title={Persistent hypermethioninaemia with dominant inheritance}, author={Dr H. J. Blom and Angelina J Davidson and James D . Finkelstein and Anthony S. Luder and Ilaria Bernardini and J-J. Martin and Albert Tangerman and J M Frans Trijbels and S. Harvey Mudd and Stephen Goodman and William A Gahl}, journal={Journal of Inherited Metabolic Disease}, year={1992}, volume={15}, pages={188-197} }