Molecular and cellular insights into a distinct myopathy of Great Dane dogs.
A myopathy in the Great Dane dog with characteristic pathological and molecular features is reported. Young adults present with progressive weakness and generalised muscle atrophy. To better define this condition, an investigation using histopathology, confocal microscopy, biochemistry and microarray analysis was undertaken. The skeletal muscles of affected dogs exhibited increased oxidative fibre phenotype and core fibre lesions characterised by the disruption of the sarcomeric architecture and the accumulation of mitochondrial organelles. Affected muscles displayed co-ordinated expression of genes consistent with a slow-oxidative phenotype, which was possibly a compensatory response to chronic muscle damage. There was disruption of Z-lines in affected muscles which, at the molecular level, manifested as transcriptional dysregulation of several Z-line associated genes, including alpha-actinin, myotilin, desmin, vimentin and telethonin. The pathology of this canine myopathy is distinct from that of human central core myopathies that are characterised by cores devoid of mitochondria and by the presence of myofibrillar breakdown products.
Chang
Kin-Chow
KC
School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK. kin-chow.chang@nottingham.ac.uk
McCulloch
Maj-Lis C
ML
Anderson
Thomas James
TJ
D000818:Animals; D001947:Breeding; D004283:Dog Diseases / Q000235:genetics / Q000473:pathology*; D004285:Dogs; D005260:Female; D020869:Gene Expression Profiling / Q000662:veterinary; D007150:Immunohistochemistry; D008297:Male; D018613:Microscopy, Confocal / Q000662:veterinary; D008854:Microscopy, Electron / Q000662:veterinary; D009133:Muscular Atrophy / Q000235:genetics / Q000473:pathology / Q000662:veterinary*; D009135:Muscular Diseases / Q000235:genetics / Q000473:pathology / Q000662:veterinary*; D009210:Myofibrils / Q000235:genetics / Q000378:metabolism / Q000648:ultrastructure; D020411:Oligonucleotide Array Sequence Analysis / Q000662:veterinary