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Published on: June 3, 2013
Human personality dimensions of persistence and harm avoidance associated with DRD4 and 5-HTTLPR polymorphisms
1Department of Experimental Psychology, Institute of Psychology, Eotvos Lorand University, Izabella u. 46, Budapest 1064, Hungary. anna@puskin.sote.hu
Summary
This study explored links between personality traits and specific gene variations. Male subjects with a DRD4 7-repeat allele showed lower Persistence, and gene interactions influenced Harm Avoidance.
Area of Science:
- Behavioral Genetics
- Neuroscience
- Psychiatry
Background:
- Human personality is influenced by genetic factors.
- Dopamine D4 receptor (DRD4) and serotonin transporter (5-HTTLPR) gene polymorphisms are implicated in behavioral traits.
- Understanding these genetic associations can provide insights into personality development.
Purpose of the Study:
- To investigate the association between personality traits measured by the Temperament and Character Inventory (TCI) and two genetic polymorphisms: DRD4 VNTR and 5-HTTLPR.
- To examine potential interactions between these genetic polymorphisms in relation to personality.
- To explore the implications of these findings for understanding temperament and potential links to conditions like ADHD.
Main Methods:
- Recruitment of 157 ethnically homogeneous Caucasian individuals.
- Genotyping for DRD4 VNTR and 5-HTTLPR polymorphisms.
- Assessment of personality traits using the Temperament and Character Inventory (TCI).
- Statistical analysis to determine associations and interactions between genotypes and personality scores.
Main Results:
- No significant association was found between Novelty Seeking and the DRD4 VNTR.
- Male individuals with the DRD4 7-repeat allele demonstrated significantly lower Persistence scores.
- The 5-HTTLPR polymorphism alone did not significantly affect temperament dimensions.
- A significant interaction between DRD4 VNTR and 5-HTTLPR was observed for Harm Avoidance, with a specific genotype combination showing higher scores.
Conclusions:
- Genetic variations in DRD4 and 5-HTTLPR, and their interactions, are associated with specific personality traits like Persistence and Harm Avoidance.
- The DRD4 7-repeat allele may be a risk factor for lower Persistence, with theoretical links to ADHD.
- Findings contribute to understanding the genetic underpinnings of human temperament and personality.
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