Association of DRD2 and BDNF Genetic Polymorphisms with Exercise Addiction

Area of Science:

• Behavioral genetics
• Exercise science
• Psychiatry

Background:

• Exercise addiction is a compulsive behavior with adverse health outcomes.
• Biological and social factors are not well understood.
• No studies have investigated genetic variants linked to exercise addiction.

Purpose of the Study:

• To investigate associations between specific gene polymorphisms and exercise addiction.
• To explore genetic underpinnings of compulsive exercise behavior.

Main Methods:

• Genotyping of polymorphisms in DRD1, DRD2, BDNF, HFE, ACTN3, PPARA, PPARGC1A, and AMPD1.
• Recruitment of 469 participants (athletes and non-athletes, ages 18-50).
• Use of oral swabs for genetic analysis and the Negative Addiction Scale questionnaire.

Main Results:

• A significant association was found between the DRD2 GG genotype and asymptomatic participants.
• The DRD2 AA genotype was associated with participants symptomatic for exercise addiction.
• The BDNF CC genotype was linked to symptomatic individuals, while the T allele was associated with asymptomatic individuals.

Conclusions:

• Specific genotypes of DRD2 and BDNF may be associated with exercise addiction.
• Studying single nucleotide polymorphisms individually reveals challenges in understanding behavioral phenotypes.
• Further research is needed to elucidate the complex genetic contributions to exercise addiction.