Skeletal and cardiac myopathies in mice lacking utrophin and dystrophin: a model for Duchenne muscular dystrophy.
Dystrophin is a cytoskeletal protein of muscle fibers; its loss in humans leads to Duchenne muscular dystrophy, an inevitably fatal wasting of skeletal and cardiac muscle. mdx mice also lack dystrophin, but are only mildly dystrophic. Utrophin, a homolog of dystrophin, is confined to the postsynaptic membrane at skeletal neuromuscular junctions and has been implicated in synaptic development. However, mice lacking utrophin show only subtle neuromuscular defects. Here, we asked whether the mild phenotypes of the two single mutants reflect compensation between the two proteins. Synaptic development was qualitatively normal in double mutants, but dystrophy was severe and closely resembled that seen in Duchenne. Thus, utrophin attenuates the effects of dystrophin deficiency, and the double mutant may provide a useful model for studies of pathogenesis and therapy.
Grady
R M
RM
Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
Teng
H
H
Nichol
M C
MC
Cunningham
J C
JC
Wilkinson
R S
RS
Sanes
J R
JR
D000818:Animals; D009202:Cardiomyopathies / Q000150:complications / Q000473:pathology; D003598:Cytoskeletal Proteins / Q000172:deficiency*; D004195:Disease Models, Animal; D016189:Dystrophin / Q000172:deficiency*; D005260:Female; D008297:Male; D008565:Membrane Proteins / Q000172:deficiency*; D051379:Mice; D018101:Mice, Inbred mdx; D009119:Muscle Contraction; D018482:Muscle, Skeletal / Q000473:pathology* / Q000502:physiology; D009137:Muscular Dystrophy, Animal / Q000150:complications / Q000473:pathology*; D009206:Myocardium / Q000473:pathology*; D009469:Neuromuscular Junction / Q000473:pathology; D012038:Regeneration; D049411:Utrophin
D003598:Cytoskeletal Proteins; D016189:Dystrophin; D008565:Membrane Proteins; C483600:Utrn protein, mouse; D049411:Utrophin