[Genetic determinants of obesity. Current issues]

Area of Science:

• Human Genetics
• Molecular Biology
• Epidemiology

Context:

• Monogenic obesity mutations are rare and insufficient to explain the current epidemic.
• Common obesity is understood to have a polygenic basis, with individual variants having minor impacts.
• Genome-wide association scans (GWAS) provide a powerful tool for investigating complex genetic diseases like obesity.

Purpose:

• To identify and characterize polygenic variants contributing to common human obesity.
• To explore the genetic architecture underlying body weight regulation.
• To leverage GWAS findings for understanding obesity's genetic predisposition.

Summary:

• While rare mutations in major genes cause severe obesity, common obesity results from numerous gene variants, each with a small effect.
• The melanocortin-4 receptor (MC4R) and "fat mass and obesity associated" (FTO) genes harbor key polygenic variants influencing body mass index.
• By December 2009, 17 confirmed polygenes affecting body weight regulation were identified through extensive genetic studies.

Impact:

• Identified specific polygenic variants (e.g., in MC4R and FTO) that significantly contribute to obesity risk.
• Advanced the understanding of the genetic underpinnings of common obesity beyond monogenic causes.
• Provided a foundation for future research into targeted obesity interventions based on polygenic profiles.