Polymorphisms in the adiponutrin gene are associated with increased insulin secretion and obesity

European Journal of Endocrinology
L E JohanssonM Ridderstråle

Abstract

The insulin responsive adiponutrin or patatin-like phospholipase 3 (PNPLA3, previously ADPN) gene shows association with obesity and in vitro adipocyte lipolysis. This study aimed to replicate the association between PNPLA3 variants and obesity, and to investigate their effect on insulin resistance and beta-cell function. rs738409 (Met148Ile) and rs2072907 (C to G) were genotyped using TaqMan allelic discrimination assay in a Swedish population-based sample (n=1811). Oral glucose tolerance test (OGTT) with data from three time points (0, 30, and 120 min) were available from individuals under the age of 50 years (n=973). Both variant alleles were associated with decreased prevalence of obesity (P<0.05); odds ratio 0.75 (0.61-0.93) per carried Ile-allele for rs738409 and 0.80 (0.64-1.00) per carried G-allele for rs2072907. For obesity as a quantitative trait, there was no association in the whole population, but in obese subjects body mass index (BMI; P=0.023) and waist (P=0.0098) were higher in carriers of the Ile-allele. The Ile-carriers also displayed decreased insulin secretion in response to OGTT (30 min insulin; P=0.007, insulinogenic index; P=0.0051) with no significant differences in fasting plasma glucose (P=0.31), beta-...Continue Reading

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