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Genetics and genomics of depression
Pavel Hamet1, Johanne Tremblay
1Département de médecine, Faculté de médecine, Université de Montréal, and Centre de recherche, Centre hospitalier de l'Université de Montréal (CHUM), Québec, Canada. pavel.hamet@umontreal.ca
Metabolism: Clinical and Experimental
|May 7, 2005
Summary
Genetic factors contribute significantly to depressive disorders, but identifying specific genes is challenging. Animal models are proving useful in mapping genetic loci for depression and related behaviors like anxiety.
Area of Science:
- Psychiatric Genetics
- Neuroscience
- Behavioral Genetics
Background:
- Depressive disorders are highly prevalent psychiatric conditions with significant socioeconomic impact.
- Etiology remains poorly understood, though heritability estimates suggest up to 50% genetic contribution.
- Gene-environment interactions, particularly involving the serotonin transporter (5-HTT) gene, are implicated in depression.
Purpose of the Study:
- To explore the genetic underpinnings of depressive disorders.
- To investigate the utility of animal models in identifying genetic loci for depression and related behavioral traits.
Main Methods:
- Analysis of family aggregation, twin studies, and genome scans (including Utah pedigrees).
- Meta-analysis of genome scans.
- Studies utilizing animal models, including F2 crosses, recombinant inbred strains, and recombinant congenic strains.
Main Results:
- Genome scans have identified a locus on chromosome 12 associated with major depression, showing sex-specific effects.
- Recent meta-analyses showed limited significance for quantitative trait loci on chromosomes 9, 10, 14, and 18.
- Animal model studies successfully mapped significant loci for stress response and anxiety in rats and mice.
Conclusions:
- Identifying specific genetic determinants for depression is complex due to low sibling relative risk.
- Animal models offer a powerful approach for localizing genetic loci influencing depression, anxiety, and stress response.
- Further research integrating human and animal genetic data is warranted to elucidate the etiology of depressive disorders.