G
Genetic Archaeology
GENETIC ARCHAEOLOGY // PROFILE

DRD2

Dopamine Receptor D2

CHR 11
11q23.2

Overview

The DRD2 gene encodes the dopamine D2 receptor, a central building block of the brain’s reward system. Variants in this gene (and the neighboring ANKK1) influence receptor density, which impacts motivation, addictive behavior, and reward processing.

📍 Position
11q23.2 (Chromosome 11)
🏷️ Category
Brain / Psyche
🧪 Function
Signal Transmission (Dopamine)
📊 Influence
Addiction tendency, impulse control

Function of DRD2

Dopamine is the messenger for “desire” and “drive.” The D2 receptor often acts as an inhibitor on neuronal activity, thereby modulating dopamine release.

Key Aspects:

🎯 Reward Deficiency

Fewer D2 receptors often mean that everyday rewards (food, success) are felt less intensely (“Reward Deficiency Syndrome”).

⚡ Addictive Behavior

To compensate for the deficit, affected individuals often seek stronger stimuli (sugar, nicotine, risk-taking behavior) to raise dopamine levels.

💡 Connection: Lower receptor density (A1 allele) is associated with a higher tendency toward impulsive eating (“cravings”) and addictive behavior.

🧬 Genetic Variants

rs1800497
11:113333333
Normal (A2)

C

/

Risk (A1)

T
Taq1A (ANKK1/DRD2)
The T allele (A1) is associated with a 30-40% reduced D2 receptor density in the striatum.
A1 allele (T):
~15-20% (Europe)
rs6277
11:113300000
C
Stable
→
T
Variant
C957T
Influences mRNA stability and translation efficiency, which also alters receptor density in the brain.

Practical Significance

✅ Strategies

  • Healthy Dopamine Sources: Sports, music, achieving small goals.
  • Nutrition: Tyrosine-rich foods (building blocks for dopamine).
  • Avoidance: Conscious avoidance of extreme addictive stimuli.

⚠️ Risks

  • Tendency toward binge eating
  • Nicotine dependence (more difficult withdrawal)
  • Procrastination (difficulties with motivation)

📚 Data Sources

  • OMIM: #126450 (Dopamine Receptor D2)
  • dbSNP: rs1800497 (Taq1A), rs6277
  • PubMed: Noble (2003) – D2 dopamine receptor gene in addiction
  • Nature Neuroscience: Dopamine D2 receptors and impulsivity

Last Update: February 2026

Biological Function

The D2 receptor modulates dopamine signal transmission. Reduced density (often caused by the Taq1A allele) leads to weaker perception of rewards, increasing the craving for stronger stimuli (food, substances).

Associated Conditions

Addiction susceptibility Obesity (Binge Eating) ADHD Impulse control disorders
Molecular Analysis

Analyzed Markers

rs1800497 Risk Factor
Pos: 11:113333333 | Alleles: C/T

Taq1A (ANKK1/DRD2) - T-allele (A1): 30-40% reduced D2 receptor density, increased risk for addictive behavior and cravings.

rs6277 Modifier
Pos: 11:113300000 | Alleles: C/T

C957T - Influences mRNA stability and receptor density in the striatum.