rs1800497 - DRD2 Taq1A - Dopamine Receptor Density
Gene: ANKK1/DRD2
rs1800497 (Taq1A) is located near the DRD2 dopamine receptor gene. The A1 allele (T) is associated with reduced dopamine D2 receptor density in the brain, which affects reward sensitivity, addiction vulnerability, and motivation.
Genotype Interpretations
A2/A2 - Normal dopamine receptor density. Standard reward processing
A1/A2 - Slightly reduced D2 receptor density. May seek more stimulation for reward
A1/A1 - Significantly reduced D2 receptors (~30-40% less). Associated with increased addiction susceptibility and reward-seeking behavior
Population Context
The A1 allele frequency varies: ~20% European, ~35% East Asian, ~42% Indigenous American. Higher prevalence in populations with historical alcohol exposure.
Clinical Relevance
A1 carriers may benefit from awareness of addiction risk. Exercise and novel experiences can naturally boost dopamine. Not deterministic, environment and choice matter enormously.
Sources
- [1] Thompson J et al. (1997) Am J Med Genet 74:162-6
- [2] Noble EP (2000) Eur Psychiatry 15:79-89
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