Heritability of hippocampal functional and microstructural organisation

Area of Science:

• Neuroscience
• Human Anatomy
• Genetics

Background:

• The hippocampus, a medial temporal lobe structure, is vital for learning and memory.
• Distinct subregions (subiculum, cornu ammonis, dentate gyrus) exhibit microstructural and functional differences.
• Previous research indicates hippocampal subregion volumes are heritable and show genetic expression gradients.

Purpose of the Study:

• To investigate how a stable, heritable hippocampal organization supports flexible cognitive functions in healthy adults.
• To explore the interplay between genetic influences and experience-driven factors in shaping hippocampal structure and function.

Main Methods:

• Utilized multimodal neuroimaging data from the Human Connectome Project, leveraging a twin study design.
• Analyzed the heritability of functional connectivity between the hippocampus and cortex.
• Examined genetic correlations between hippocampal and cortical microstructure.
• Investigated macroscale organizational axes (anterior-to-posterior, medial-to-lateral) for both functional and microstructural organization.

Main Results:

• Functional connectivity between the hippocampus and cortex is heritable.
• Hippocampal microstructure genetically correlates with cortical microstructure.
• Both functional and microstructural organization align with consistent anterior-to-posterior and medial-to-lateral axes.
• Heritability of functional organization is lower than microstructural organization, suggesting a role for experience.

Conclusions:

• Inherited macroscale organization links hippocampal structure and function, demonstrating a balance of stability and plasticity.
• Individual differences in functional organization may stem from experience-based modifications.
• Provides novel insights into the genetic underpinnings of hippocampal structure and function.