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First published online May 26, 2006
Journal of Experimental Biology 209, 2249-2264 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02153

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Review Article: Phenotypic Plasticity in Skeletal Muscle

Environment and plasticity of myogenesis in teleost fish

Ian A. Johnston

Gatty Marine Laboratory, School of Biology, University of St Andrews, St Andrews, Fife, KY16 8LB, Scotland, UK

e-mail: iaj{at}st-andrews.ac.uk

Accepted 7 February 2006

Summary

Embryonic development in teleosts is profoundly affected by environmental conditions, particularly temperature and dissolved oxygen concentrations. The environment determines the rate of myogenesis, the composition of sub-cellular organelles, patterns of gene expression, and the number and size distribution of muscle fibres. During the embryonic and larval stages, muscle plasticity to the environment is usually irreversible due to the rapid pace of ontogenetic change. In the early life stages, muscle can affect locomotory performance and behaviour, with potential consequences for larval survival. Postembryonic growth involves myogenic progenitor cells (MPCs) that originate in the embryo. The embryonic temperature regime can have long-term consequences for the growth of skeletal muscle in some species, including the duration and intensity of myotube formation in adult stages. In juvenile and adult fish, abiotic (temperature, day-length, water flow characteristics, hypoxia) and biotic factors (food availability, parasitic infection) have complex effects on the signalling pathways regulating the proliferation and differentiation of MPCs, protein synthesis and degradation, and patterns of gene expression. The phenotypic responses observed to the environment frequently vary during ontogeny and are integrated with endogenous physiological rhythms, particularly sexual maturation. Studies with model teleosts provide opportunities for investigating the underlying genetic mechanisms of muscle plasticity that can subsequently be applied to non-model species of more ecological or commercial interest.

Key words: temperature, oxygen, myotomal muscle, environmental genomics, phenotypic plasticity, ectotherm, developmental plasticity, skeletal muscle

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PHENOTYPIC PLASTICITY

Kathryn Phillips
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