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Updated: Mar 5, 2026
08:14
Comprehensive Analysis of Transcription Dynamics from Brain Samples Following Behavioral Experience
Published on: August 26, 2014
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Comparative tissue transcriptomics highlights dynamic differences among tissues but conserved metabolic transcript
Lori K Bogren1, Katharine R Grabek2, Gregory S Barsh3
1Cell and Developmental Biology, University of Colorado School of Medicine, Aurora, USA. lori.bogren@ucdenver.edu.
Summary
Hibernating ground squirrels exhibit tissue-specific gene expression changes during torpor. Key transcripts in heart, skeletal muscle, and liver are identified, offering insights into hibernation
Area of Science:
- * Physiology and molecular biology of hibernation.
- * Comparative transcriptomics.
- * Mammalian adaptation to extreme environments.
Background:
- * Hibernation involves prolonged periods of torpor with near-freezing body temperatures, followed by spontaneous rewarming.
- * The molecular mechanisms driving these drastic physiological shifts remain largely unknown.
- * While transcription is suppressed during torpor, some transcripts are preserved in brown adipose tissue (BAT), suggesting their importance for arousal.
Purpose of the Study:
- * To investigate differential gene expression in skeletal muscle, heart, and liver during the hibernation cycle.
- * To identify tissue-specific transcriptomic patterns associated with torpor and arousal in 13-lined ground squirrels.
- * To explore whether specific transcripts are relatively increased during torpor in these tissues, similar to observations in BAT.
Main Methods:
- * Quantification of EDGE-tags from five distinct physiological states across the hibernation cycle.
- * Application of supervised clustering (Random Forest) to analyze relative transcript abundances.
- * Independent differential expression analyses and divisive clustering to identify transcript cohorts.
Main Results:
- * Supervised clustering successfully distinguished states bracketing torpor (entrance and arousal) in all three tissues.
- * Differential expression analysis revealed thousands of unique transcripts in heart (3347), skeletal muscle (6784), and liver (2433).
- * Few differentially expressed genes were common across all tissues; these were linked to mitochondrial and apoptotic pathways. Tissue-specific transcript cohorts increased during torpor bouts.
Conclusions:
- * Hibernation involves significant, tissue-specific alterations in gene expression in skeletal muscle, heart, and liver.
- * Unique sets of transcripts are upregulated during torpor in each tissue, indicating specialized roles.
- * These findings provide a valuable transcriptomic resource for understanding the molecular basis of hibernation and arousal.
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