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Publication
Selection-, age-, and exercise-dependence of skeletal muscle gene expression
patterns in a rat model of metabolic fitness.
Authors Ren YY, Koch LG, Britton SL, Qi NR, Treutelaar MK, Burant CF, Li JZ
Submitted By Submitted Externally on 4/30/2020
Status Published
Journal Physiological genomics
Year 2016
Date Published 11/1/2016
Volume : Pages 48 : 816 - 825
PubMed Reference 27637250
Abstract Intrinsic aerobic exercise capacity can influence many complex traits including
obesity and aging. To study this connection we established two rat lines by
divergent selection of untrained aerobic capacity. After 32 generations the high
capacity runners (HCR) and low capacity runners (LCR) differed in endurance
running distance and body fat, blood glucose, other health indicators, and
natural life span. To understand the interplay among genetic differences,
chronological age, and acute exercise we performed microarray-based gene
expression analyses in skeletal muscle with a 2×2×2 design to simultaneously
compare HCR and LCR, old and young animals, and rest and exhaustion. Transcripts
for mitochondrial function are expressed higher in HCRs than LCRs at both rest
and exhaustion and for both age groups. Expression of cell adhesion and
extracellular matrix genes tend to decrease with age. This and other age effects
are more prominent in LCRs than HCRs, suggesting that HCRs have a slower aging
process and this may be partly due to their better metabolic health. Strenuous
exercise mainly affects transcription regulation and cellular response. The
effects of any one factor often depend on the other two. For example, there are
~140 and ~110 line-exercise "interacting" genes for old and young animals,
respectively. Many genes highlighted in our study are consistent with prior
reports, but many others are novel. The gene- and pathway-level statistics for
the main effects, either overall or stratified, and for all possible
interactions, represent a rich reference dataset for understanding the
interdependence among lines, aging, and exercise.




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