ISSN:
1432-1076
Keywords:
Rett syndrome
;
Hyperammonemia
;
Multiple carboxylases
;
Holocarboxylase synthetase
;
Biotinidase
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Abstract A patient with Rett syndrome (cerebral atrophy associated with hyperammonemia) was studied. Primary defects of urea cycle enzymes were excluded as causes of the disorder. The analysis of urinary organic acids showed a moderate increase of lactate, methylcitrate, tiglylglycine and 3-hydroxisovalerate, indicating an abnormality of multiple carboxylases. Biotin supplementation reversed the urinary abnormalities. In fibroblasts grown with a low biotin medium propionylCoA and 3-methylcrotonylCoA carboxylase activities were reduced. Holocarboxylase synthetase activity was normal (V max and Km). Surprisingly the biotinidase in fibroblasts was not decreased. The data indicate that some patients with Rett syndrome might suffer from a biotin-dependent defect of unknown nature.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00496036
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