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. Author manuscript; available in PMC: 2008 Jan 24.
Published in final edited form as: Curr Opin Gastroenterol. 2007 Jan;23(1):60–66. doi: 10.1097/MOG.0b013e32801145c2

Table 2. Allelic polymorphisms of thiopurine S-methyltransferse and their representative phenotypes.

Allele Genotype Phenotype
1 wild-type high metabolizer
1A C178T high metabolizer
1S T474C high metabolizer
2 G238C intermediate metabolizer
3A G460A + A719G intermediate metabolizer
3B G460A intermediate metabolizer
3C A719G intermediate metabolizer
3D, 4–8, 10 N/A minimal effect