" /> Histidinemia - CISMeF





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;

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26/05/2024


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