Preferred Label : Histidinemia;
Type : Phenotype, molecular basis known;
Alternative titles and symbols : Histidine ammonia-lyase deficiency; Hal deficiency; His deficiency; Histidase deficiency;
Description : Histidinemia is an autosomal recessive metabolic disorder characterized by increased
levels of histidine in blood, urine, and cerebrospinal fluid, and decreased levels
of the metabolite urocanic acid in blood, urine, and skin cells. Although histidinemia
was originally associated with mental retardation and speech defects, it is generally
considered to be a benign disorder (Levy et al., 2001). However, it is possible that
histidinemia may be a risk factor for developmental disorders in certain individuals
under specific circumstances, such as perinatal events (Ishikawa, 1987).;
Inheritance : Autosomal recessive; Autosomal dominant;
Molecular basis : Caused by mutation in the histidine ammonia lyase gene (HAL, 609457.0001);
Laboratory abnormalities : Increased histidine in blood, urine, and CSF; Decreased or absent histidase activity; Decreased urocanic acid in blood, urine, and skin cells;
Prefixed ID : #235800;
Origin ID : 235800;
UMLS CUI : C0220992;
Currated CISMeF NLP mapping
DO Cross reference
Genes related to phenotype
HPO term(s)
ORDO concept(s)
Semantic type(s)
UMLS correspondences (same concept)