Psychomotor retardation and myopathy due to S-adenosylhomocysteine hydrolase deficiency (Q89151): Difference between revisions

@@ description / pt-br / description / pt-br @@
+Esta síndrome é caracterizada por atraso psicomotor e miopatia grave (hipotonia, ausência de reflexos tendinosos e mielinização tardia) desde o nascimento, associada a hipermetioninemia e níveis séricos elevados de creatina quinase. Foi descrito em três pacientes não relacionados. A transmissão parece ser autossômica recessiva. Duas mutações causais foram identificadas no gene que codifica a S-adenosil-homocisteína hidrolase (SAHH; AHCY), uma enzima envolvida no metabolismo da metionina. Uma dieta restrita em metionina, junto com suplementos de creatina, pode melhorar parcialmente a mielinização retardada e o desenvolvimento psicomotor.
@@ description / en / description / en @@
+This syndrome is characterised by psychomotor delay and severe myopathy (hypotonia, absent tendon reflexes and delayed myelination) from birth, associated with hypermethioninaemia and elevated serum creatine kinase levels. It has been described in three unrelated patients. Transmission appears to be autosomal recessive. Two causative mutations have been identified in the gene encoding S-adenosylhomocysteine hydrolase (SAHH; AHCY), an enzyme involved in methionine metabolism. A methionine-restricted diet, together with creatine supplements, may partly improve the delayed myelination and psychomotor development.
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+August 2026Timestamp +2026-08-13T00:00:00Z
Timezone +00:00
Calendar Gregorian
Precision 1 day
Before 0
After 0
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++2026-08-13T00:00:00Z
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++00:00
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-Precision
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 After
@@ Property / Collection date: 13 August 2026 / rank @@
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Latest revision as of 15:42, 15 August 2026

This syndrome is characterised by psychomotor delay and severe myopathy (hypotonia, absent tendon reflexes and delayed myelination) from birth, associated with hypermethioninaemia and elevated serum creatine kinase levels. It has been described in three unrelated patients. Transmission appears to be autosomal recessive. Two causative mutations have been identified in the gene encoding S-adenosylhomocysteine hydrolase (SAHH; AHCY), an enzyme involved in methionine metabolism. A methionine-restricted diet, together with creatine supplements, may partly improve the delayed myelination and psychomotor development.

Language	Label	Description	Also known as
default for all languages	ID_215404985
English	Psychomotor retardation and myopathy due to S-adenosylhomocysteine hydrolase deficiency	This syndrome is characterised by psychomotor delay and severe myopathy (hypotonia, absent tendon reflexes and delayed myelination) from birth, associated with hypermethioninaemia and elevated serum creatine kinase levels. It has been described in three unrelated patients. Transmission appears to be autosomal recessive. Two causative mutations have been identified in the gene encoding S-adenosylhomocysteine hydrolase (SAHH; AHCY), an enzyme involved in methionine metabolism. A methionine-restricted diet, together with creatine supplements, may partly improve the delayed myelination and psychomotor development.