Genes, Economics, and Happiness

Area of Science:

• Behavioral Genetics
• Molecular Psychiatry
• Behavioral Economics

Background:

• Subjective well-being, including life satisfaction and happiness, is known to be influenced by genetic factors.
• Previous research has established the heritability of baseline happiness but has limited exploration into molecular genetic associations.
• Understanding the genetic underpinnings of well-being has implications for economic theories of utility.

Purpose of the Study:

• To investigate the extent to which genetic variation influences subjective well-being.
• To examine the association between a specific functional polymorphism in the serotonin transporter gene (5-HTTLPR) and life satisfaction.
• To explore the role of genetic predispositions in individual differences in well-being.

Main Methods:

• A nationally-representative twin design was utilized to estimate the heritability of life satisfaction.
• A genetic association study was conducted to analyze the relationship between the 5-HTTLPR genotype and life satisfaction.
• Replication attempts were performed on independent samples to validate initial findings.

Main Results:

• Approximately 33% of the variation in life satisfaction was attributed to genetic variation in the twin sample.
• An initial association was found between the longer, more efficient variant of the 5-HTTLPR genotype and greater life satisfaction (n=2,545, p=0.012).
• Replication studies yielded mixed results, suggesting the initial association may not be robust across different populations.

Conclusions:

• Genetic variation plays a significant role in explaining individual differences in life satisfaction.
• The relationship between the 5-HTTLPR genotype and subjective well-being requires further investigation due to inconsistent replication.
• These findings contribute to understanding the biological and genetic determinants of utility and well-being, with potential implications for economics.