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Gene Expression Profiling in the Hibernating Primate, Cheirogaleus Medius.

Sheena L Faherty1, José Luis Villanueva-Cañas2, Peter H Klopfer3

  • 1Department of Biology, Duke University sheena.faherty@gmail.com.

Genome Biology and Evolution
|July 15, 2016
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Summary

Hibernation relies on differential gene expression, not unique genes. Studying dwarf lemurs reveals 90 candidate genes critical for metabolic depression during torpor, supporting universal hibernation mechanisms.

Keywords:
CheirogaleusRNA-Seqdifferential gene expressiondwarf lemurswhite adipose tissue

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Area of Science:

  • * Genomics and Evolutionary Biology
  • * Mammalian Physiology and Metabolism

Background:

  • * Hibernation is a complex adaptation enabling mammals to survive periods of high energetic demand.
  • * Prior research suggests hibernation involves differential gene expression rather than unique hibernator genes.
  • * Investigating diverse species is crucial to confirm universal genetic mechanisms of hibernation.

Purpose of the Study:

  • * To investigate gene expression dynamics during hibernation in Madagascar's dwarf lemurs (Cheirogaleus).
  • * To identify candidate genes associated with varying physiological states throughout the annual hibernation cycle.
  • * To compare gene expression patterns with other mammalian hibernators and assess evolutionary selection.

Main Methods:

  • * RNA-Sequencing (RNA-Seq) was employed to analyze gene expression profiles.
  • * Longitudinal sampling of biological tissues from the same individuals captured annual cycle variations.
  • * Evolutionary rate analysis was used to examine selection pressures on hibernation-related genes.

Main Results:

  • * Ninety candidate genes showed variable expression between active and torpor states in dwarf lemurs.
  • * These genes are involved in metabolic pathways, feeding behavior, and circadian rhythms.
  • * Hibernation-related genes in these species do not appear to evolve under positive selection compared to non-hibernators.

Conclusions:

  • * Differential expression of conserved genes is critical for hibernation physiology.
  • * The identified genes are vital for maintaining health during prolonged metabolic depression.
  • * Findings support the hypothesis of universal genetic underpinnings for mammalian hibernation across diverse species.