Proliferator-activated receptor gamma Pro12Ala interacts with the insulin receptor substrate 1 Gly972Arg and increase the risk of insulin resistance and diabetes in the mixed ancestry population from South Africa.
BACKGROUND
The peroxisome proliferator-activated receptor gamma (PPARG), Pro12Ala and the insulin receptor substrate (IRS1), Gly972Arg confer opposite effects on insulin resistance and type 2 diabetes mellitus (T2DM). We investigated the independent and joint effects of PPARG Pro12Ala and IRS1 Gly972Arg on markers of insulin resistance and T2DM in an African population with elevated risk of T2DM. In all 787 (176 men) mixed-ancestry adults from the Bellville-South community in Cape Town were genotyped for PPARG Pro12Ala and IRS1 Gly972Arg by two independent laboratories. Glucose tolerance status and insulin resistance/sensitivity were assessed.


RESULTS
Genotype frequencies were 10.4% (PPARG Pro12Ala) and 7.7% (IRS1 Gly972Arg). Alone, none of the polymorphisms predicted prevalent T2DM, but in regression models containing both alleles and their interaction term, PPARG Pro12 conferred a 64% higher risk of T2DM. Furthermore PPARG Pro12 was positively associated in adjusted linear regressions with increased 2-hour post-load insulin in non-diabetic but not in diabetic participants.


CONCLUSIONS
The PPARG Pro12 is associated with insulin resistance and this polymorphism interacts with IRS1 Gly972Arg, to increase the risk of T2DM in the mixed-ancestry population of South Africa. Our findings require replication in a larger study before any generalisation and possible application for risk stratification.
Zelda
Z
Vergotine
Yandiswa Y
YY
Yako
Andre P
AP
Kengne
Rajiv T
RT
Erasmus
Biomedical Sciences, Faculty of Health and Wellness Sciences, Cape Peninsula University of Technology, PO Box 1906, Bellville 7530, Cape Town, South Africa. matshat@cput.ac.za.
Tandi E
TE
Matsha
D000328:Adult; D000368:Aged; D003924:Diabetes Mellitus, Type 2 / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D055504:Insulin Receptor Substrate Proteins / Q000235:genetics*; D007333:Insulin Resistance / Q000235:genetics*; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D008957:Models, Genetic; D047495:PPAR gamma / Q000235:genetics*; D011110:Polymorphism, Genetic; D013019:South Africa
C526292:IRS1 protein, human; D055504:Insulin Receptor Substrate Proteins; D047495:PPAR gamma