Tyrosine Hydroxylase (TH) Deficiency is a rare inborn error of metabolism (IEM) and autosomal recessive disorder of catecholamines pathways. The disorder is caused by defects in the Tyrosine hydroxylase (TH) gene which encodes for the enzyme tyrosine hydroxylase. This enzyme is part of the production of catecholamines such as dopamine, norepinephrine and epinephrine are all essential for normal nervous system function. Dopamine transmits signals to help the brain control physical movement and emotional behavior. Norepinephrine and epinephrine are involved in the autonomic nervous system. Mutations in the TH gene result in reduced activity of the tyrosine hydroxylase enzyme. As a result, the body produces less dopamine, norepinephrine and epinephrine. Symptoms of the disorder include abnormal movements, autonomic dysfunction, and other neurological problems. Treatments can include the administration of levodopa; however patient responses can vary greatly. The frequency of Tyrosine Hydroxylase Deficiency is unknown.

Tyrosine Hydroxylase Deficiency References