Functional implications of genetic variation in human PPARgamma

Area of Science:

• Metabolic Regulation
• Molecular Endocrinology
• Human Genetics

Background:

• Peroxisome proliferator-activated receptor gamma (PPARgamma) is crucial for lipid and glucose metabolism.
• Genetic variations in PPARgamma, including common polymorphisms and rare mutations, influence metabolic health.
• Patients with PPARgamma mutations present with familial partial lipodystrophy type 3 and monogenic metabolic syndrome.

Purpose of the Study:

• To elucidate the functional consequences of genetic PPARgamma alterations.
• To gain insights into the molecular mechanisms underlying metabolic dysfunction caused by PPARgamma perturbations.
• To understand how different alterations in receptor function converge on a common metabolic pathway.

Main Methods:

• Analysis of human genetic evidence, including common polymorphisms (Pro12Ala) and loss-of-function mutations.
• Study of patients with familial partial lipodystrophy type 3 and monogenic metabolic syndrome.
• Elucidation of the crystal structure of the PPARgamma-RXRalpha heterodimer bound to DNA.

Main Results:

• Genetic variants in PPARgamma are linked to significant metabolic dysregulation.
• Mutant PPARgamma causes severe metabolic disorders like familial partial lipodystrophy and monogenic metabolic syndrome.
• The crystal structure reveals how alterations in receptor function lead to unified metabolic dysfunction pathways.

Conclusions:

• Genetic variations in PPARgamma directly impact human lipid and glucose metabolism.
• Structural insights into PPARgamma function explain the common metabolic consequences of diverse genetic alterations.
• Understanding PPARgamma's role is key to addressing complex metabolic syndromes.