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;
Origin ID : 253270;
UMLS CUI : C0268581;
Broader ORDO disease(s)
CISMeF manual mappings
Currated CISMeF NLP mapping
DO Cross reference
Genes related to phenotype
HPO term(s)
ORDO concept(s)
See also inter- (CISMeF)
Semantic type(s)
UMLS correspondences (same concept)
Validated automatic mappings to BTNT
Validated automatic mappings to NTBT