The Pro12Ala PPARgamma2 variant determines metabolism at the gene-environment interface

Cell Metabolism
Sami HeikkinenJ Auwerx

Abstract

The metabolic impact of the common peroxisome proliferator-activated receptor gamma isoform 2 (PPARgamma2) variant Pro12Ala in human populations has been widely debated. We demonstrate, using a Pro12Ala knockin model, that on chow diet, Ala/Ala mice are leaner, have improved insulin sensitivity and plasma lipid profiles, and have longer lifespans. Gene-environment interactions played a key role as high-fat feeding eliminated the beneficial effects of the Pro12Ala variant on adiposity, plasma lipids, and insulin sensitivity. The underlying molecular mechanisms involve changes in cofactor interaction and adiponectin signaling. Altogether, our results establish the Pro12Ala variant of Ppargamma2 as an important modulator in metabolic control that strongly depends on the metabolic context.

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