Alternative titles and symbols : TPMTD; Thiopurine s-methyltransferase deficiency; Tpmt deficiency;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the thiopurine S-methyltransferase gene (TPMT, 187680.0001);
Laboratory abnormalities : Decreased activity of thiopurine S-methyltransferase; Decreased metabolism of thiopurine drugs; Increased toxic thioguanine nucleotides (TGNs) on standard doses of thiopurine drugs;