" /> Holocarboxylase synthetase deficiency - CISMeF





Preferred Label : Holocarboxylase synthetase deficiency;

Type : Phenotype, molecular basis known;

Alternative titles and symbols : Multiple carboxylase deficiency, early onset; Multiple carboxylase deficiency, neonatal form; Hlcs deficiency;

Description : Early-onset multiple carboxylase deficiency, or holocarboxylase deficiency, is an autosomal recessive disorder of biotin metabolism. See also late-onset or juvenile MCD (253260) caused by mutation in the biotinidase gene (BTD; 609019). Sweetman (1981) recognized that multiple carboxylase deficiency could be classified into early and late forms. The early form showed higher urinary excretion of 3-hydroxyisovaleric acid and 3-hydroxypropionic acid than the late form and was associated with normal plasma biotin concentrations. Sweetman (1981) proposed a defect in holocarboxylase synthetase and intestinal biotin absorption, respectively. Care must be taken to differentiate the inherited multiple carboxylase deficiencies from acquired biotin deficiencies, such as those that develop after excessive dietary intake of avidin, an egg-white glycoprotein that binds specifically and essentially irreversibly to biotin (Sweetman et al., 1981) or prolonged parenteral alimentation without supplemental biotin (Mock et al., 1981).;

Inheritance : Autosomal recessive;

Molecular basis : Caused by mutations in the holocarbyoxylase synthetase gene (HLCS, 253270.0001);

Laboratory abnormalities : Organic aciduria (elevated beta-hydroxyisovalerate, beta-methylcrotonylglycine, beta-hydroxypropionate, methylcitrate, lactate, tiglylglycine); Mild-moderate hyperammonemia; Holocarboxylase synthetase deficiency; Normal serum biotin concentration;

Prefixed ID : #253270;

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09/06/2024


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