Dopamine receptor DRD3 codes for trait aggression as Mendelian recessive

Area of Science:

• Neurogenetics
• Psychiatric Genetics
• Behavioral Genetics

Background:

• The dopamine receptor D2 gene (DRD3) Ser9Gly polymorphism is linked to essential tremor, depression, and schizophrenia.
• Recent research suggests a DRD3 haplotype containing Ser-9 may protect against schizophrenia.
• Existing trait models of personality provide a framework for exploring genetic influences on behavior.

Purpose of the Study:

• To hypothesize that the DRD3 Ser allele confers trait aggression via Mendelian recessive inheritance.
• To explore the pleiotropic nature of DRD3, linking allelic polymorphism to both behavior and disease.
• To suggest that genetic trait models of personality are promising avenues for research.

Main Methods:

• Review of existing associations between DRD3 and various conditions.
• Consideration of recent findings on DRD3 haplotypes and schizophrenia.
• Integration with current trait models of personality.

Main Results:

• Proposes a hypothesis linking the DRD3 Ser allele to trait aggression through recessive inheritance.
• Suggests DRD3 is a pleiotropic gene influencing both behavior and disease susceptibility.
• Implies that schizophrenia patients may be classifiable based on DRD3/Ser/Ser genotype.

Conclusions:

• The DRD3 gene's allelic polymorphism is associated with both behavior (aggression) and disease (schizophrenia).
• Genetic models of personality traits show potential for understanding complex human behaviors.
• Further research, including personality inventories and biochemical assays, is needed to validate the DRD3-aggression link.