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Prefrontal-hippocampal coupling during memory processing is modulated by COMT val158met genotype.

Alessandro Bertolino¹, Valeria Rubino, Fabio Sambataro

¹Psychiatric Neuroscience Group, Section on Mental Disorders, Department of Psychiatric and Neurological Sciences, University of Bari, Bari, Italy. bertolia@psiciat.uniba.it

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|September 5, 2006

Summary

Genetic variations in COMT impact brain region function and connectivity, influencing recognition memory performance. The Val allele is linked to poorer memory recall and altered brain activity in the hippocampal formation and ventrolateral prefrontal cortex.

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Area of Science:

Neuroscience
Cognitive Neuroscience
Behavioral Genetics

Background:

Declarative and recognition memory involve a network including the hippocampal formation (HF) and ventrolateral prefrontal cortex (VLPFC).
Dopamine signaling significantly modulates the interaction between these brain regions, as suggested by animal studies.

Purpose of the Study:

To investigate the influence of the COMT val158met polymorphism on HF and VLPFC function and their functional coupling during recognition memory tasks in humans.
To explore the genetic underpinnings of individual differences in recognition memory performance.

Main Methods:

Functional magnetic resonance imaging (fMRI) was employed in healthy human participants.
Participants were carefully matched for demographic and genetic variables.
The study specifically examined the effects of the COMT val158met polymorphism.

Main Results:

The COMT Val allele was associated with diminished retrieval performance.
Reduced HF and increased VLPFC neuronal recruitment were observed during encoding and retrieval in Val allele carriers.
Functional coupling between HF and VLPFC during retrieval was less favorable and predicted behavioral accuracy.

Conclusions:

Genetic modulation of dopamine via the COMT polymorphism influences individual differences in recognition memory.
Altered responsivity and connectivity between HF and VLPFC, influenced by genetics, contribute to variations in memory performance.