Heritability of Happiness
Genetic factors account for approximately 32–40% of overall happiness and 70–80% of stable subjective well-being. Shown from twin and family studies.
Specific genes, such as 5-HTTLPR, BDNF, SLC6A4, NPY, MAOA, and dopamine receptor D4, influence emotional and stress responses, potentially affecting resilience.
The MAOA gene has been associated with increased happiness in women, suggesting a gender-specific genetic influence on well-being.
The FAAH gene correlates with national happiness differences, indicating a genetic component to happiness across different populations.
The serotonin transporter gene (5-HTTLPR) is crucial in resilience, emotional regulation, and stress adaptation.
Genes like CRHR1 and FKBP5 regulate the hypothalamic-pituitary-adrenal (HPA) axis, a key system in stress adaptation.
Genetic factors influencing resilience overlap with those affecting psychiatric disorders. Resilience shares genetic components with major depression (MD) and generalized anxiety disorder (GAD), accounting for a significant portion of their heritability.
There is also a genetic overlap between resilience, alcohol dependence, and PTSD.
Interaction between genes and the environment plays a significant role. Genes like COMT, SLC6A4, and NPY are involved in gene-environment interactions that influence resilience, particularly in childhood adversity and stress-related disorders.
Environmental influences can trigger epigenetic changes that modify gene expression, affecting resilience to stress.
