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DRD2 polymorphisms modulate reward and emotion processing, dopamine neurotransmission and openness to experience
Marta Peciña1, Brian J Mickey, Tiffany Love
1Molecular and Behavioral Neuroscience Institute, University of Michigan, Ann Arbor, MI, USA.
Summary
Genetic variations in the dopamine D2 receptor (DRD2) influence brain activity during reward and emotional processing. This impacts personality traits and may increase vulnerability to mood and substance use disorders.
Area of Science:
- Neuroscience
- Genetics
- Psychiatry
Background:
- Dopamine (DA) neurotransmission via D2 receptors (DRD2) is crucial for reward processing, cognition, and stress responses.
- Understanding genetic influences on DRD2 function is key to neurobiology of personality and psychiatric disorders.
Purpose of the Study:
- Investigate how genetic variations in DRD2 affect human brain function during reward and emotional tasks.
- Examine the link between DRD2 genetic variations, neuroimaging data, and personality traits.
Main Methods:
- Employed haplotype-based and single nucleotide polymorphism (SNP) analysis.
- Utilized functional magnetic resonance imaging (fMRI) for hemodynamic responses during reward and emotional processing.
- Conducted functional connectivity and positron emission tomography (PET) scans to assess DA D2/3 receptor neurotransmission.
Main Results:
- A haplotype block (rs4274224 and rs4581480) modulated brain activity in the dorsolateral prefrontal cortex (DLPFC) and subgenual anterior cingulate cortex (sgACC).
- The SNP rs4274224 alone showed functional effects on DLPFC during reward anticipation and stress-induced dopamine release.
- Genotype variations correlated with 'Openness to Experience' personality trait and neuroimaging findings.
Conclusions:
- DRD2 gene variations significantly impact brain functions related to emotion, stress, and reward processing.
- These findings contribute to understanding normal personality variation.
- Genetic variations in DRD2 may influence vulnerability to mood and substance use disorders.
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