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Published on: June 15, 2011

[Schizophrenia and ocular misalignment: phenotypic and genetic association analysis]

Y Yoshikawa1, T Toyota, K Yoshitsugu

  • 1Laboratory for Molecular Psychiatry, RIKEN Brain Science Institute.

Seishin Shinkeigaku Zasshi = Psychiatria Et Neurologia Japonica
|March 18, 2005
PubMed

Insights

Minor physical anomalies like constant exotropia are linked to schizophrenia. Gene variations in PMX2B show a modest association with schizophrenia and exotropia, suggesting a potential genetic interaction.

Area of Science:

  • Neuroscience
  • Genetics
  • Psychiatry

Context:

  • The neurodevelopmental hypothesis of schizophrenia etiology is supported by the increased incidence of minor physical anomalies (MPAs).
  • Ocular misalignment, a type of MPA, has not been previously assessed in schizophrenia patients.
  • Constant exotropia is identified as a phenotype significantly associated with schizophrenia.

Purpose:

  • To investigate the association between constant exotropia and schizophrenia.
  • To explore the genetic mechanisms underlying this association by examining transcription factor genes ARIX and PMX2B.
  • To identify potential genetic risk factors and interactions contributing to schizophrenia and ocular misalignment.

Summary:

  • This study found a marked association between constant exotropia and schizophrenia.
  • Frequent deletion/insertion polymorphisms in the 20-alanine homopolymer stretch of PMX2B were identified.
  • These PMX2B polymorphisms showed a modest association with constant exotropia in schizophrenia, overall schizophrenia, and schizophrenia with strabismus.

Impact:

  • The findings suggest a possible interaction between PMX2B gene variations and other schizophrenia-precipitating factors, increasing the risk for combined phenotypes.
  • This research highlights the unique nature of polyalanine length variations in PMX2B.
  • The study provides novel insights into the genetic underpinnings of schizophrenia and its associated physical anomalies.

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