Related Experiment Videos
Genetics of obesity.
Karine Clement1, Philippe Boutin, Philippe Froguel
1CNRS-Institute of Biology of Lille, Pasteur Institute of Lille, 1 rue Calmette BP245, Lille 59016, France.
American Journal of Pharmacogenomics : Genomics-Related Research in Drug Development and Clinical Practice
|October 18, 2002
Summary
Genetic factors significantly influence obesity, from rare single-gene mutations affecting the leptin-melanocortin pathway to common polygenic forms. Understanding these genetic underpinnings is key for future obesity drug development.
Area of Science:
- Genetics
- Endocrinology
- Metabolism
Background:
- Obesity is a complex multifactorial disease influenced by both environmental and genetic factors.
- Rare cases of severe, early-onset obesity are often caused by single-gene mutations impacting the leptin-melanocortin pathway.
- Common obesity is typically polygenic, involving multiple genes with smaller effects.
Purpose of the Study:
- To review the genetic basis of obesity, including monogenic and polygenic forms.
- To discuss the role of the leptin-melanocortin pathway in bodyweight regulation.
- To explore current approaches for identifying obesity-related genes.
Main Methods:
- Review of literature on monogenic obesity genes (leptin, leptin receptor, POMC, PC1, MC4R).
- Discussion of two main strategies for identifying genes in polygenic obesity: candidate gene approach and positional cloning.
- Summary of genome-wide scan findings localizing obesity loci to specific chromosomes.
Main Results:
- Mutations in leptin, its receptor, POMC, PC1, and MC4R are implicated in rare monogenic obesity.
- Leptin replacement therapy validates the leptin pathway's role but shows variable responses potentially due to genetic variability.
- Genome-wide scans have identified major obesity loci on chromosomes 2, 5, 10, 11, and 20.
Conclusions:
- Understanding monogenic obesity pathways offers targets for novel drug development.
- Genetic screening is valuable, and further research into genetic variability influencing treatment response is warranted.
- Both candidate gene and positional cloning approaches are crucial for unraveling the genetic architecture of common obesity.