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Quantitative trait loci for physical activity traits in mice.
J Timothy Lightfoot1, Michael J Turner, Daniel Pomp
1Department of Kinesiology, University of North Carolina, Charlotte, NC 28223, USA. tlightfoot@uncc.edu
Physiological Genomics
|January 4, 2008
Summary
Researchers identified genetic regions (quantitative trait loci) influencing voluntary physical activity in mice. These findings highlight a genetic basis for exercise behavior and pinpoint specific genes for future study.
Area of Science:
- Genetics
- Behavioral Science
- Animal Models
Background:
- The genetic underpinnings of voluntary physical activity remain largely unexplored.
- Understanding these genetic factors is crucial for comprehending exercise behavior and its variations.
Purpose of the Study:
- To identify quantitative trait loci (QTL) associated with daily running wheel distance, duration, and speed in mice.
- To investigate the genetic basis of voluntary physical activity.
Main Methods:
- Phenotyped 310 F(2) mice derived from high (C57L/J) and low (C3H/HeJ) active inbred strains over 21 days.
- Utilized single-nucleotide polymorphism (SNP) genotyping for linkage analysis.
- Performed QTL analysis and replicated findings using haplotype association mapping.
Main Results:
- Sex and strain significantly influenced all activity indexes; female mice exhibited higher activity levels than males.
- Identified four significant QTL for exercise duration, distance, and speed (DUR13.1, DIST13.1, SPD13.1, and SPD9.1).
- QTL DUR13.1, DIST13.1, and SPD13.1 colocalized and each explained ~6% of phenotypic variance; SPD9.1 explained 11.3%.
Conclusions:
- This study provides evidence for a significant genetic contribution to voluntary physical activity in mice.
- Identified QTL serve as a foundation for future research into specific candidate genes regulating exercise behavior.
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