VNTR Polymorphisms in the SLC6A3 Gene and Their Impact on Time Perception and EEG Activity

Area of Science:

• Neuroscience
• Genetics
• Cognitive Psychology

Background:

• The SLC6A3 gene, encoding the dopamine transporter, plays a crucial role in dopaminergic neurotransmission.
• Polymorphisms in the SLC6A3 gene's 3'-UTR and intron 8 VNTR regions are associated with various neurological and psychiatric conditions.
• Understanding the genetic basis of time perception is essential for elucidating cognitive processes.

Purpose of the Study:

• To investigate the association between SLC6A3 3'-UTR and intron 8 VNTR polymorphisms and supra-second time estimation.
• To examine the influence of these polymorphisms on electroencephalographic (EEG) alpha band activity in the dorsolateral prefrontal cortex (DLPFC).

Main Methods:

• Genotyping of 178 male participants for SLC6A3 3'-UTR and intron 8 VNTR polymorphisms.
• EEG recordings targeting the left DLPFC during a time estimation task (1s, 4s, 7s, 9s).
• Analysis of absolute error and ratio in time estimation, and EEG alpha power.

Main Results:

• A significant combined effect of SLC6A3 polymorphisms on time perception was observed only for the 1-second duration (p=0.0002).
• EEG alpha power analysis revealed significant differences in the left DLPFC (p=0.0002).

Conclusions:

• SLC6A3 3'-UTR and intron 8 VNTR polymorphisms modulate dopaminergic neurotransmission relevant to supra-second time judgments.
• These genetic variations impact the left DLPFC's role in voluntary attention for visual stimuli.
• EEG power activity patterns can quantify cognitive resources involved in time interval processing.