Improvement in survival and muscle function in an mdx/utrn(-/-) double mutant mouse using a human retinal dystrophin transgene.
Duchenne muscular dystrophy is a progressive muscle disease characterized by increasing muscle weakness and death by the third decade. mdx mice exhibit the underlying muscle disease but appear physically normal with ordinary lifespans, possibly due to compensatory expression of utrophin. In contrast, double mutant mice (mdx/utrn(-/-)), deficient for both dystrophin and utrophin die by approximately 3 months and suffer from severe muscle weakness, growth retardation, and severe spinal curvature. The capacity of human retinal dystrophin (Dp260) to compensate for the missing 427 kDa muscle dystrophin was tested in mdx/utrn(-/-) mice. Functional outcomes were assessed by histology, EMG, MRI, mobility, weight and longevity. MCK-driven transgenic expression of Dp260 in mdx/utrn(-/-) mice converts their disease course from a severe, lethal muscular dystrophy to a viable, mild myopathic phenotype. This finding is relevant to the design of exon-skipping therapeutic strategies since Dp260 lacks dystrophin exons 1-29.
Gaedigk
Roger
R
Department of Medical Research, Children's Mercy Hospitals & Clinics, Pediatric Research Building 4th Floor, 2401 Gillham, Kansas City, MO 64108, USA.
Law
Douglas J
DJ
Fitzgerald-Gustafson
Kathleen M
KM
McNulty
Steven G
SG
Nsumu
Ndona N
NN
Modrcin
Ann C
AC
Rinaldi
Robert J
RJ
Pinson
David
D
Fowler
Stephen C
SC
Bilgen
Mehmet
M
Burns
Joanne
J
Hauschka
Stephen D
SD
White
Robert A
RA
D000367:Age Factors; D000818:Animals; D015153:Blotting, Western / Q000379:methods; D016189:Dystrophin / Q000172:deficiency / Q000235:genetics*; D004576:Electromyography / Q000379:methods; D015870:Gene Expression / Q000502:physiology; D015316:Genetic Therapy; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods; D051379:Mice; D018101:Mice, Inbred mdx; D008822:Mice, Transgenic; D018482:Muscle, Skeletal / Q000473:pathology* / Q000503:physiopathology*; D009137:Muscular Dystrophy, Animal / Q000628:therapy*; D009336:Necrosis; D014057:Tomography, X-Ray Computed / Q000379:methods; D019076:Transgenes; D049411:Utrophin / Q000235:genetics
D016189:Dystrophin; D049411:Utrophin