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Related Experiment Videos

Gene expression patterns during enhanced periods of visual cortex plasticity.

S S Prasad1, L Z Kojic, P Li

  • 1Department of Ophthalmology and Brain Surgery Research Center, University of British Columbia, Vancouver, Canada. shprasad@interchange.ubc.ca

Neuroscience
|April 17, 2002
PubMed
Summary

This study identifies specific genes active during critical periods of visual cortex development and plasticity in cats. These findings illuminate the genetic basis of experience-dependent brain changes.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Mammalian visual cortex is sensitive to experience during development.
  • Neuronal response properties change based on experience.
  • Gene expression plays a crucial role in developmental plasticity.

Purpose of the Study:

  • To identify genes expressed during the critical period of visual cortex plasticity.
  • To differentiate age-related gene expression changes from plasticity-related changes.
  • To define candidate genes involved in ocular dominance plasticity.

Main Methods:

  • Used filter-based cDNA arrays to analyze gene expression in cat visual cortex across developmental stages.
  • Employed hierarchical cluster analysis to identify gene expression patterns.

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  • Validated findings using reverse transcription-polymerase chain reaction and immunocytochemistry.

    • Main Results:

    • Identified a subset of genes selectively expressed during the peak critical period for plasticity.
    • Distinguished plasticity-related gene expression from age-related changes.
    • Found candidate genes involved in cell adhesion, second messenger systems, and neurotransmitter recycling.

    Conclusions:

    • High-density cDNA array hybridization is effective for studying developmental plasticity.
    • Identified specific "plasticity candidate genes" crucial for experience-dependent visual cortex development.
    • Provides insights into the molecular mechanisms underlying critical period plasticity.