A PYY Q62P variant linked to human obesity

Area of Science:

• Genetics
• Endocrinology
• Obesity Research

Background:

• Peptide YY (PYY) is recognized for its role in regulating food intake.
• Previous functional studies in rodents and humans suggest PYY influences appetite control.

Purpose of the Study:

• To investigate the association between genetic variations in the PYY gene and abnormal weight in humans.
• To identify specific PYY gene alterations linked to extreme obesity or leanness.

Main Methods:

• Sequencing of coding exons and splice sites of the PYY gene in a cohort of extremely obese and lean individuals.
• Analysis of familial segregation of identified variants with body mass index (BMI).
• In vitro assessment of receptor-binding selectivity and in vivo evaluation of food intake in mouse models with wild-type and mutant PYY.

Main Results:

• Three rare non-synonymous variants in the PYY gene were identified.
• The PYY Q62P variant demonstrated familial segregation with body mass and altered in vitro receptor-binding selectivity.
• Mutant PYY 62P showed an insignificant effect on reducing food intake in vivo compared to wild-type PYY.

Conclusions:

• This study provides the first evidence that rare PYY sequence variants can impact human susceptibility to obesity.
• The PYY Q62P variant's functional alterations suggest a potential mechanism linking PYY genetics to weight regulation.
• Genetic factors within the PYY gene represent a potential target for understanding and managing obesity.