Confirmation that MAT1A p.Ala259Val mutation causes autosomal dominant hypermethioninemia.
Mol Genet Metab Rep
; 13: 9-12, 2017 Dec.
Article
em En
| MEDLINE
| ID: mdl-28748147
ABSTRACT
Methionine adenosyltransferase (MAT) I/III deficiency is an inborn error of metabolism caused by mutations in MAT1A, encoding the catalytic subunit of MAT responsible for the synthesis of S-adenosylmethionine, and is characterized by persistent hypermethioninemia. While historically considered a recessive disorder, a milder autosomal dominant form of MAT I/III deficiency occurs, though only the most common mutation p.Arg264His has ample evidence to prove dominant inheritance. We report a case of hypermethioninemia caused by the p.Ala259Val substitution and provide evidence of autosomal dominant inheritance by showing both maternal inheritance of the mutation and concomitant hypermethioninemia. The p.Ala259Val mutation falls in the dimer interface, and thus likely leads to dominant inheritance by a similar mechanism to that described in the previously reported dominant negative mutation, that is, by means of interference with subunits encoded by the wild-type allele.
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Base de dados:
MEDLINE
Tipo de estudo:
Etiology_studies
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article