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Mutation of Semaphorin-6A Disrupts Limbic and Cortical Connectivity and Models Neurodevelopmental Psychopathology

Authors
Journal
PLoS ONE
1932-6203
Publisher
Public Library of Science
Publication Date
Volume
6
Issue
11
Identifiers
DOI: 10.1371/journal.pone.0026488
Keywords
  • Research Article
  • Biology
  • Anatomy And Physiology
  • Neurological System
  • Central Nervous System
  • Developmental Biology
  • Morphogenesis
  • Cell Migration
  • Genetics
  • Human Genetics
  • Genetic Association Studies
  • Genetic Mutation
  • Genetics Of Disease
  • Model Organisms
  • Animal Models
  • Mouse
  • Neuroscience
  • Developmental Neuroscience
  • Axon Guidance
  • Neural Circuit Formation
  • Behavioral Neuroscience
  • Neurobiology Of Disease And Regeneration
  • Medicine
  • Diagnostic Medicine
  • Clinical Neurophysiology
  • Electroencephalography
  • Mental Health
  • Psychiatry
  • Child Psychiatry
  • Neuropsychiatric Disorders
  • Psychoses
  • Schizophrenia
  • Psychology
  • Behavior
  • Social And Behavioral Sciences
Disciplines
  • Biology
  • Medicine

Abstract

Psychiatric disorders such as schizophrenia and autism are characterised by cellular disorganisation and dysconnectivity across the brain and can be caused by mutations in genes that control neurodevelopmental processes. To examine how neurodevelopmental defects can affect brain function and behaviour, we have comprehensively investigated the consequences of mutation of one such gene, Semaphorin-6A, on cellular organisation, axonal projection patterns, behaviour and physiology in mice. These analyses reveal a spectrum of widespread but subtle anatomical defects in Sema6A mutants, notably in limbic and cortical cellular organisation, lamination and connectivity. These mutants display concomitant alterations in the electroencephalogram and hyper-exploratory behaviour, which are characteristic of models of psychosis and reversible by the antipsychotic clozapine. They also show altered social interaction and deficits in object recognition and working memory. Mice with mutations in Sema6A or the interacting genes may thus represent a highly informative model for how neurodevelopmental defects can lead to anatomical dysconnectivity, resulting, either directly or through reactive mechanisms, in dysfunction at the level of neuronal networks with associated behavioural phenotypes of relevance to psychiatric disorders. The biological data presented here also make these genes plausible candidates to explain human linkage findings for schizophrenia and autism.

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