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An Appetitive Spatial Working Memory Task for Mice in a Semi-Automated 8-Arm Radial Maze, Reducing Fearful Memory Association in the Maze
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Working memory brain activity and capacity link MAOA polymorphism to aggressive behavior during development.

T Ziermans1, I Dumontheil, C Roggeman

  • 1Neuroscience Department, Karolinska Institutet, Stockholm, Sweden.

Translational Psychiatry
|July 27, 2012
PubMed
Summary
This summary is machine-generated.

A specific MAOA gene variant influences brain activity linked to working memory (WM) in children. This brain activity mediates the connection between the MAOA gene and reduced aggressive behavior during development.

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Area of Science:

  • Neuroscience
  • Genetics
  • Developmental Psychology

Background:

  • Working memory (WM) capacity development is crucial for cognitive growth and psychopathology risk.
  • Brain activity serves as a key endophenotype for understanding WM neurobiology and gene-behavior links.
  • Low WM capacity is a known risk factor for developing psychopathology.

Purpose of the Study:

  • To investigate gene-brain-behavior relationships concerning working memory development.
  • To examine the influence of specific genetic variations in dopaminergic genes on brain activity and WM capacity.
  • To understand the neurobiological pathways linking genetic factors to behavioral outcomes in children.

Main Methods:

  • Longitudinal study of typically developing children and adolescents.
  • Assessed visuospatial working memory (VSWM) capacity and brain activity using functional magnetic resonance imaging (fMRI).
  • Analyzed 18 single-nucleotide polymorphisms (SNPs) in six dopaminergic genes (COMT, SLC6A3/DAT1, DBH, DRD4, DRD5, MAOA) and behavioral problems via Child Behavior Checklist (CBCL).

Main Results:

  • A specific SNP (rs6609257) near the MAOA gene affected brain activity in frontal, parietal, and occipital regions.
  • Increased activity in this network correlated with higher VSWM capacity.
  • Higher VSWM capacity predicted fewer externalizing (aggressive/oppositional) symptoms, suggesting a mediating role.

Conclusions:

  • The MAOA gene variant rs6609257 influences brain activity associated with working memory development.
  • Working memory brain activity and capacity appear to mediate the link between the MAOA gene and aggressive behavior.
  • These findings offer insights into the neurodevelopmental pathways connecting genetics to behavior.