Developmental and activity-dependent genomic occupancy profiles of CREB in monkey area V1

Area of Science:

• Neuroscience
• Molecular Biology
• Genomics

Background:

• Mammalian neocortex exhibits plasticity, especially during early development.
• Cyclic AMP-response element-binding (CREB) is crucial for neuroplasticity.
• CREB's genomic targets in development and sensory deprivation are largely unknown.

Purpose of the Study:

• To identify and categorize CREB targets in the monkey neocortex.
• To investigate CREB's role during development and after sensory deprivation.
• To understand CREB's transcriptional regulation of neuroplasticity.

Main Methods:

• Chromatin immunoprecipitation (ChIP) followed by microarray analysis (ChIP-chip) in monkey area V1.
• Analysis of CREB DNA occupancy at different developmental stages and after monocular enucleation (ME).
• Quantitative real-time polymerase chain reaction (qRT-PCR) for gene expression analysis.

Main Results:

• Identified 795 CREB-bound promoter loci common across conditions.
• Discovered 192 CREB targets specific to infant area V1 after ME.
• Found CREB targets involved in cytoskeleton-based structural modification during development.
• Observed distinct gene expression profiles in infant vs. adult area V1 post-ME.

Conclusions:

• This is the first extensive genomic analysis of CREB DNA occupancy in the primate neocortex.
• CREB plays a multifaceted role in regulating neuroplastic changes.
• Specific CREB targets are involved in developmental plasticity and response to sensory input.