Abstract
Myosin heavy chains (MyHCs) and fibre types in the masseter muscle of seven species of Australian marsupials (brushtail and ringtail possums, bettong, bandicoot, dunnart, two species of antechinuses) spanning three orders were studied by native myosin electrophoresis, SDS-PAGE, immunoblotting and immunohistochemistry. We found only two fibre types in the masseter muscles of these animals: (1) masticatory fibres expressing masticatory MyHC, and (2) hybrid α/β fibres that co-express α-cardiac and β-cardiac MyHCs. Masticatory fibres predominate in most species, being appropriate for predation or for chewing tough vegetable matter. The relative abundance of α/β fibres decreased from 60% to 0 in the order: ringtail possum > brushtail possum > bettong > bandicoot > dunnart/antechinus. These variations in masseter fibre type are correlated with decreasing amounts of vegetable matter in the diets of these animals. The results are in contrast to earlier work on masseter fibres of macropodids that expressed α-cardiac MyHC almost homogeneously. The fact that the bettong (Family: Potoroidae), which belong to the same marsupial superfamily (Macropodoidea) as kangaroos and wallabies (Family: Macropodidae), has not specialized in the exclusive expression of α-cardiac MyHC as members of the latter family suggests that this specialization was of recent phylogenetic origin (30 million years before present).
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Abbreviations
- HRP:
-
horseradish peroxidase
- MyHC:
-
Myosin heavy chain
- mAb:
-
Monoclonal antibody
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Acknowledgments
This work was supported by grants from the National Health and Medical Research Council and the Australian Research Council. WWHZ is a recipient of the Faculty of Medicine Postgraduate Scholarship of the University of Sydney. We thank Prof. Terry Dawson of the University of NSW, Dr Kerry Withers of the University of Southern Queensland, Dr Peter Runham of the University of Western Australia and John Cossey of Sydney University for providing tissue samples. The experiments were done with the approval of the Animal Ethics Review Committee of the University of Sydney and comply with the current laws governing animal experimentation in Australia.
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Hoh, J.F.Y., Kang, L.H.D., Sieber, L.G. et al. Myosin isoforms and fibre types in jaw-closing muscles of australian marsupials. J Comp Physiol B 176, 685–695 (2006). https://doi.org/10.1007/s00360-006-0091-x
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DOI: https://doi.org/10.1007/s00360-006-0091-x