| TPMT

Thiopurine methyltransferase or thiopurine S-methyltransferase (TPMT) is an enzyme that is encoded by the TPMT gene. A pseudogene for this locus is located on chromosome 18q.Thiopurine methyltransferase methylates thiopurine compounds. The methyl donor is S-adenosyl-L-methionine, which is converted to S-adenosyl-L-homocysteine. This enzyme metabolizes thiopurine drugs via S-adenosyl-L-methionine as the S-methyl donor and S-adenosyl-L-homocysteine as a byproduct.
 

| Typical data

As the OD values of the standard curve may vary according to the conditions of the actual assay performance (e.g. operator, pipetting technique, wash technique or temperature effects), the operator should establish a standard curve for each test. Typical standard curve and data are provided below for reference only.

 

Concentration (ng/mL)	20	10	5	2.5	1.25	0.625	0.312	0
OD	2.24	1.63	1.01	0.55	0.44	0.31	0.25	0.09
Corrected OD	2.15	1.54	0.92	0.46	0.35	0.22	0.16	-

 

| Repeatability

Intra-assay Precision (Precision within an assay)：CV% < 10%; Inter-assay Precision (Precision between assays)：CV% < 10%
 

| Recovery

The recovery of Human TPMT spiked at three different levels in samples throughout the range of the assay was evaluated in various matrices.

 

Sample Type	Range(%)	Average Recovery(%)
Serum(n=8)	84-103	96
Plasma(n=8)	92-105	101

 

| Linearity

Samples were spiked with high concentrations of Human TPMT and diluted with Universal Diluent to produce samples with values within the range of the assay.

 

		Serum(n=4)	Plasma(n=4)
1 : 2	Range (%)	84-95	86-96
	Average (%)	91	93
1 : 4	Range (%)	89-103	87-108
	Average (%)	93	98