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Updated: Aug 8, 2026
Assessing Functional Performance in the Mdx Mouse Model
Published on: March 27, 2014
Behavioral characterization of mdx3cv mice deficient in C-terminal dystrophins
1Laboratoire d'Ethologie et Neurobiologie, Université Louis Pasteur, URA CNRS 1295, Strasbourg, France. vaillend@currif.u-strasbg.fr
Abstract:
Cognitive deficits are frequently associated with Duchenne muscular dystrophy (DMD). They might be due to a deficiency in the brain isoforms of the 427 kDa full-length dystrophin, and/or to altered expression of other C-terminal dystrophin-gene products (Dp71, Dp140) also found in brain. Mdx mice, which only lack full-length dystrophin in both muscle and brain, were previously shown to have moderate learning and memory deficits. In the present study, we investigated behavioral responses in mdx3cv mutants, which have altered expression of all the dystrophin-gene products. Contrary to the original mdx mice, mdx3cv mice showed enhanced anxiety-related behaviors and reduced locomotion as compared to control mice. Although those perturbations might be related to the lack in C-terminal dystrophins, they do not seem sufficient to induce strong learning deficits in this mutant. Indeed, we showed that mdx3cv mice may display similar or weaker deficits during the learning of a bar-pressing task, as compared to mdx mice. The relevance of the mdx3cv mutant as a model to study the cognitive deficits associated with DMD is discussed.
Insights
Duchenne muscular dystrophy (DMD) mouse models show altered anxiety and locomotion. The mdx3cv mutant, with broader dystrophin gene product changes, exhibits these behaviors but not severe learning deficits, unlike mdx mice.
Area of Science:
- Neuroscience
- Genetics
- Animal Models
Background:
- Cognitive deficits are common in Duchenne muscular dystrophy (DMD).
- These deficits may stem from altered dystrophin isoforms (full-length, Dp71, Dp140) in the brain.
- Mdx mice, lacking full-length dystrophin, exhibit learning and memory impairments.
Purpose of the Study:
- To investigate behavioral responses in mdx3cv mutant mice, which have altered expression of all dystrophin-gene products.
- To compare the cognitive and behavioral phenotypes of mdx3cv mice with mdx mice and controls.
Main Methods:
- Behavioral testing of mdx3cv mutant mice, including assessment of anxiety-related behaviors and locomotion.
- Evaluation of learning and memory using a bar-pressing task.
- Comparison of mdx3cv and mdx mouse behavioral data.
Main Results:
- Mdx3cv mice displayed increased anxiety-related behaviors and reduced locomotion compared to control mice.
- Learning deficits in mdx3cv mice were similar to or less severe than those observed in mdx mice.
- The altered expression of dystrophin-gene products in mdx3cv mice did not lead to significant cognitive impairments.
Conclusions:
- Mdx3cv mice present a distinct behavioral phenotype with enhanced anxiety and reduced locomotion, potentially linked to C-terminal dystrophin changes.
- This mutant may not be a suitable model for studying severe cognitive deficits in DMD.
- Further research is needed to understand the specific roles of different dystrophin isoforms in cognitive function.
