A meta-analysis of genome-wide association studies (GWAS) has identified six loci or regions of the human genome that are significantly linked to personality traits, report researchers at University of California San Diego School of Medicine in this week’s advance online publication of Nature Genetics. The findings also show correlations with six psychiatric disorders.
Personality is influenced by genetic and environmental factors1 and associated with mental health. However, the underlying genetic determinants are largely unknown.
We identified six genetic loci, including five novel loci2, 3, significantly associated with personality traits in a meta-analysis of genome-wide association studies (N = 123,132–260,861). Of these genome-wide significant loci, extraversion was associated with variants in WSCD2 and near PCDH15, and neuroticism with variants on chromosome 8p23.1 and in L3MBTL2. We performed a principal component analysis to extract major dimensions underlying genetic variations among five personality traits and six psychiatric disorders (N = 5,422–18,759).
Some genetic variants linked to extraversion and neuroticism personality traits have been identified.
The first genetic dimension separated personality traits and psychiatric disorders, except that neuroticism and openness to experience were clustered with the disorders. High genetic correlations were found between extraversion and attention-deficit–hyperactivity disorder (ADHD) and between openness and schizophrenia and bipolar disorder. The second genetic dimension was closely aligned with extraversion–introversion and grouped neuroticism with internalizing psychopathology (e.g., depression or anxiety).
In addition, there were high genetic correlations between extraversion and attention deficit hyperactivity disorder (ADHD) and between openness and schizophrenia and bipolar disorder. Neuroticism was genetically correlated with internalized psychopathologies, such as depression and anxiety.
Study and Press Release
- Genome-wide analyses for personality traits identify six genomic loci and show correlations with psychiatric disorders, NATURE GENETICS, doi:10.1038/ng.3736, 05 December 2016.
- Personality Traits and Psychiatric Disorders Linked to Specific Genomic Locations, UC San Diego News Center, December 8, 2016.
- DES studies on epigenetics and transgenerational effects.
- DES studies on psychological health.