Is there a genomic tone? Implications for understanding development, adaptation and treatment

Area of Science:

• Genomics
• Neuroscience
• Cell Biology

Background:

• Cellular plasticity is a fundamental biological process.
• Genomic plasticity, or the ability of the genome to change, is less understood in relation to cellular function.
• Traditional genomic approaches focus on specific gene expression levels, potentially missing broader regulatory patterns.

Purpose of the Study:

• To explore the hypothesis linking cellular plasticity and genomic plasticity.
• To introduce and define the concept of 'genomic tone' as a global genomic property.
• To investigate the relationship between gene expression organization and behavioral variability.

Main Methods:

• Review of existing literature on cellular and genomic plasticity.
• Novel microarray analysis to assess large-scale gene expression organization.
• Studies on genetically identical mice to control for genetic variation.

Main Results:

• Variability in large-scale gene expression organization correlated with behavioral differences in genetically identical mice.
• The hippocampus showed an association between gene expression organization and behavioral variability.
• This suggests that global gene expression patterns, not just individual gene levels, are crucial for regulation.

Conclusions:

• Genomic tone, a measure of global genomic properties, is proposed as a key factor in gene expression system plasticity.
• Genomic tone may be a significant target for developmental and therapeutic interventions.
• Understanding genomic tone could reveal new insights into gene expression regulation beyond traditional methods.