NCIt definition : Human TDO2 wild-type allele is located within 4q31-q32 and is approximately 17 kb
in length. This allele, which encodes tryptophan 2,3-dioxygenase protein, is involved
in the metabolic breakdown of tryptamine and its derivatives such as tryptophan, 5-hydroxytryptophan,
and serotonin.;
NCIt note : Allelic variants of the TDO2 gene have been identified that result in protein products
which exhibit altered enzymatic activity. Certain polymorphisms are associated with
alcoholism, attention deficit hyperactivity disorder, drug dependence and Tourette
syndrome. However, the role of the TDO2 gene in addiction and mental disorders remains
to be elucidated.;