Genetic perspectives on the serotonin transporter

Area of Science:

• Neuroscience
• Genetics
• Pharmacology

Background:

• The serotonin transporter (5-HTT) is the target of widely used antidepressants and neuropsychiatric disorder treatments.
• A common gene polymorphism in 5-HTT is linked to personality traits like anxiety and neuropsychiatric disorders.
• Previous research has primarily used observational studies in humans.

Purpose of the Study:

• To develop and utilize genetically modified mouse models to investigate the functional consequences of serotonin transporter (5-HTT) deficiency.
• To explore the role of 5-HTT in neuropsychiatric disorders and complex behaviors.
• To establish a complementary "bottom-up" genetic approach to complement traditional "top-down" human studies.

Main Methods:

• Generation of mice with targeted disruption of the serotonin transporter (5-HTT) gene (heterozygote +/- and homozygote -/-).
• Cross-breeding 5-HTT deficient mice with other knockout mouse lines to create complex genetic models.
• Comparative analysis of human genetic studies and experimental mouse models.

Main Results:

• Established experimental models (5-HTT knockout mice) to study diminished or absent 5-HTT function.
• Demonstrated the utility of genetically complex mouse models in mimicking disorders with intricate etiologies.
• Facilitated the investigation of multiple neurobiological dysfunctions through combinatorial gene knockout approaches.

Conclusions:

• Genetically engineered mouse models, particularly those with targeted gene disruptions like 5-HTT knockout, are valuable tools for studying neuropsychiatric disorders.
• A "bottom-up" approach using gene knockout mice, combined with human studies, provides novel insights into the genetic underpinnings of complex behaviors and disorders.
• These integrated approaches enhance our understanding of the genetic architecture of neuropsychiatric conditions.