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Microarray analysis of developmental plasticity in monkey primary visual cortex.

Pascal E D Lachance¹, Avi Chaudhuri

¹Department of Psychology, McGill University, Montréal, Québec, Canada.

Journal of Neurochemistry

|March 11, 2004

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Researchers identified 108 transcripts in the visual cortex of Old-World monkeys that change during development and critical periods. Four genes were sensitive to monocular enucleation during the critical period, impacting visual cortical neuroplasticity.

Area of Science:

Neuroscience
Developmental Biology
Genetics

Background:

The visual critical period is a sensitive time for activity-dependent visual cortical neuroplasticity.
Understanding gene expression changes during this period is crucial for comprehending visual system development.

Purpose of the Study:

To identify transcripts associated with developmental maturation in the visual cortex.
To investigate activity-driven changes during the visual critical period using gene expression analysis.
To determine the impact of monocular enucleation on gene expression during this critical window.

Main Methods:

Microarray gene expression analysis on the visual cortex of Old-World monkeys (Cercopithicus aethiops).
Hybridization to Affymetrix HG-U95Av2 oligonucleotide microarrays.

Related Experiment Videos

Validation of results using real-time quantitative RT-PCR.

Analysis of data using Affymetrix MicroArray Suite 5.0 and dChip 1.2 software.

Main Results:

Identified 108 transcripts with differential visual cortical expression during the critical period compared to adults.
Found four transcripts globally modulated by monocular enucleation (ME) during the critical period.
Observed that these four transcripts are sensitive to ME during the critical period but not in adult animals.
Noted that three of the ME-modulated genes are immediate-early genes (IEGs), and one is a phosphatase regulating IEG expression.

Conclusions:

The study identified key genes involved in visual cortex development and plasticity during the critical period.
Immediate-early genes and regulatory phosphatases are sensitive to visual experience during the critical period.
These findings provide insights into the molecular mechanisms underlying activity-dependent visual cortical neuroplasticity.