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4-hydroxybutyric aciduria

Orpha number ORPHA22
Synonym(s) Succinic semialdehyde dehydrogenase deficiency
Prevalence <1 / 1 000 000
Inheritance
  • Autosomal recessive
Age of onset Childhood
ICD-10
  • E72.8
OMIM
UMLS -
MeSH -
MedDRA -
SNOMED CT -

Summary

The 4-hydroxybutyricaciduria deficiency is a metabolic disorder with a neurological presentation ranging from mild to severe. It is a rare disease with around 350 cases reported. The most frequent symptoms are psychomotor retardation, delayed speech development, hypotonia and ataxia. Transmission is autosomal recessive and mutations in the SSADH (Succinic Semialdehyde Dehydrogenase NAD(+)-Dependant) gene, located on chromosome 6p22, have been reported. The key biochemical feature is an accumulation of gamma-hydroxybutyrate in urine, plasma and cerebro-spinal fluid. There is no efficient treatment available.

Expert reviewer(s)

  • Pr Jaak JAEKEN
Last update: July 2006

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Detailed information
Clinical genetics review
  • EN (2010)
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