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.
Department of Medical Research, Children's Mercy Hospitals & Clinics, Pediatric Research Building 4th Floor, 2401 Gillham, Kansas City, MO 64108, USA.
Roger
R
Gaedigk
Douglas J
DJ
Law
Kathleen M
KM
Fitzgerald-Gustafson
Steven G
SG
McNulty
Ndona N
NN
Nsumu
Ann C
AC
Modrcin
Robert J
RJ
Rinaldi
David
D
Pinson
Stephen C
SC
Fowler
Mehmet
M
Bilgen
Joanne
J
Burns
Stephen D
SD
Hauschka
Robert A
RA
White
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