title: Impacts of the Callipyge mutation on ovine plasma metabolites and muscle fibre type.
abstract: The ovine Callipyge mutation causes postnatal muscle hypertrophy localized to the pelvic limbs and torso, as well as body leanness. The mechanism underpinning enhanced muscle mass is unclear, as is the systemic impact of the mutation. Using muscle fibre typing immunohistochemistry, we confirmed muscle specific effects and demonstrated that affected muscles had greater prevalence and hypertrophy of type 2X fast twitch glycolytic fibres and decreased representation of types 1, 2C, 2A and/or 2AX fibres. To investigate potential systemic effects of the mutation, proton NMR spectra of plasma taken from lambs at 8 and 12 weeks of age were measured. Multivariate statistical analysis of plasma metabolite profiles demonstrated effects of development and genotype but not gender. Plasma from Callipyge lambs at 12 weeks of age, but not 8 weeks, was characterized by a metabolic profile consistent with contributions from the affected hypertrophic fast twitch glycolytic muscle fibres. Microarray analysis of the perirenal adipose tissue depot did not reveal a transcriptional effect of the mutation in this tissue. We conclude that there is an indirect systemic effect of the Callipyge mutation in skeletal muscle in the form of changes of blood metabolites, which may contribute to secondary phenotypes such as body leanness.
authors.affiliation: CSIRO Animal, Food and Health Sciences, St Lucia, Brisbane, Australia.
authors.forename: Juan
authors.initials: J
authors.lastname: Li
authors.affiliation: CSIRO Animal, Food and Health Sciences, FD McMaster Laboratory, Armidale, Australia; New South Wales Department of Primary Industries, Beef Industry Centre of Excellence, University of New England, Armidale, Australia.
authors.forename: Paul L
authors.initials: PL
authors.lastname: Greenwood
authors.affiliation: Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan, Utah, United States of America.
authors.forename: Noelle E
authors.initials: NE
authors.lastname: Cockett
authors.affiliation: Department of Animal, Dairy and Veterinary Sciences, Utah State University, Logan, Utah, United States of America.
authors.forename: Tracy S
authors.initials: TS
authors.lastname: Hadfield
authors.affiliation: CSIRO Animal, Food and Health Sciences, St Lucia, Brisbane, Australia.
authors.forename: Tony
authors.initials: T
authors.lastname: Vuocolo
authors.affiliation: CSIRO Animal, Food and Health Sciences, St Lucia, Brisbane, Australia.
authors.forename: Keren
authors.initials: K
authors.lastname: Byrne
authors.affiliation: The University of Melbourne, School of Veterinary Science, Parkville, Australia.
authors.forename: Jason D
authors.initials: JD
authors.lastname: White
authors.affiliation: CSIRO Animal, Food and Health Sciences, St Lucia, Brisbane, Australia.
authors.forename: Ross L
authors.initials: RL
authors.lastname: Tellam
authors.affiliation: The University of Queensland, Centre for Advanced Imaging, Brisbane, Australia.
authors.forename: Horst Joachim
authors.initials: HJ
authors.lastname: Schirra
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism; D050154:Adiposity / Q000235:genetics*; D000818:Animals; D015415:Biomarkers / Q000097:blood; D021901:DNA, Intergenic; D056726:Genetic Association Studies; D006984:Hypertrophy / Q000097:blood / Q000235:genetics / Q000662:veterinary; D007797:Laminin / Q000378:metabolism; D053858:Metabolic Networks and Pathways; D055442:Metabolome; D015999:Multivariate Analysis; D018656:Muscle Fibers, Fast-Twitch / Q000378:metabolism / Q000473:pathology; D018482:Muscle, Skeletal / Q000473:pathology; D009135:Muscular Diseases / Q000097:blood / Q000235:genetics / Q000662:veterinary*; D009154:Mutation; D018995:Myosin Heavy Chains / Q000378:metabolism; D010641:Phenotype; D012756:Sheep / Q000235:genetics*; D012757:Sheep Diseases; D034561:Sheep, Domestic / Q000235:genetics*; D059467:Transcriptome
chemical_list: D015415:Biomarkers; D021901:DNA, Intergenic; D007797:Laminin; D018995:Myosin Heavy Chains