From GWAS to biology: lessons from FTO

Area of Science:

• Genetics
• Obesity Research
• Molecular Biology

Background:

• Genome-wide association studies (GWAS) have revolutionized the discovery of genes linked to complex traits.
• The FTO (fat mass and obesity associated) gene emerged as a significant genetic factor associated with body mass index (BMI) and obesity in 2007.
• Initial discoveries highlighted strong associations with BMI and food intake across diverse populations.

Purpose of the Study:

• To review the genetic and biochemical investigations into the FTO gene's complex biology.
• To summarize findings from animal models used to elucidate FTO's function.
• To provide an overview of research efforts since 2007 aimed at understanding FTO.

Main Methods:

• Review of genetic association studies, including GWAS.
• Analysis of biochemical studies investigating FTO gene products and pathways.
• Examination of data from animal models (e.g., Fto knockout mice) to assess physiological roles.

Main Results:

• Single nucleotide polymorphisms (SNPs) in the first intron of FTO are robustly associated with BMI and obesity.
• The association of FTO with body weight and food intake is consistently replicated across various populations and age groups.
• Subsequent research has begun to uncover the biological mechanisms underlying FTO's role in energy homeostasis.

Conclusions:

• The FTO gene represents a significant genetic contributor to obesity and related traits.
• Understanding FTO's intricate biology is crucial for developing effective strategies to combat obesity.
• Continued research utilizing genetic, biochemical, and animal model approaches is essential for fully characterizing FTO's function.