Computational dissection of human episodic memory reveals mental process-specific genetic profiles

Area of Science:

• Neuroscience
• Genetics
• Cognitive Psychology

Background:

• Episodic memory involves distinct processes: learning, maintenance, and emotional modulation.
• Computational models can dissociate these memory processes.
• Understanding the genetic underpinnings of these processes is crucial.

Purpose of the Study:

• To identify specific gene sets associated with distinct episodic memory processes.
• To investigate the neurobiological basis of these genetic associations using functional MRI (fMRI).

Main Methods:

• Gene set enrichment analysis of computational model parameters from 1,765 healthy adults' episodic memory performance.
• Functional MRI in 795 subjects to examine brain activity associated with L1CAM gene set and memory maintenance.

Main Results:

• Solute-carrier (SLC) transporters gene set linked to learning rate.
• Collagen formation and tyrosine kinase activity gene sets associated with negative emotional arousal's modulation of memory.
• L1 cell adhesion molecule (L1CAM) interactions gene set correlated with repetition-based memory improvement.
• L1CAM associations with memory maintenance showed significant frontal cortical activity differences in fMRI data.

Conclusions:

• Converging evidence suggests distinct genetic profiles underlie specific human episodic memory processes.
• Findings support previous links between neuromodulators and learning, and cell adhesion molecules and memory maintenance.
• Identified novel genetic pathways relevant to the neurobiology of human memory.