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Hypomyelinated mutant mice. V. Relationship between jp and jpmsd re-examined on identical genetic backgrounds
Abstract:
jp and jpmsd, two allelic mutations in the mouse that sharply reduce the amount of CNS myelin, produce diseases that can be distinguished morphologically only by their severity. This has raised the question of whether the two mutations are truly distinguishable. Since the two mutations have never been maintained on the same genetic background, correct quantitative and morphological comparison have not been possible. We have prepared a B6C3H stock of jp on the same genetic background as the available stock of jpmsd. In this jp stock, behavioral abnormalities, relative proportion of myelinated axons, and major morphological characteristics of the disease in situ are unchanged from the previous jp stock. The jp disease continues to be more severe than that of jpmsd. However, tissue from the new B6C3H stock myelinates better in organotypic culture than previous jp stocks. The increase in myelination is advantageous, not only for accurate comparison of the two alleles but for all culture studies of jp. Strictly comparable strains or stocks should be utilized in any comparative studies of closely related mutations such as jp and jpmsd.
Insights
Two mouse mutations, jp and jpmsd, affect central nervous system (CNS) myelin. Creating a comparable genetic background improved myelination in organotypic culture for jp, aiding future studies.
Area of Science:
- Neuroscience
- Genetics
- Developmental Biology
Background:
- Allelic mutations jp and jpmsd reduce CNS myelin in mice.
- Morphological distinctions between jp and jpmsd are primarily based on disease severity.
- Previous studies lacked comparable genetic backgrounds for accurate comparison.
Purpose of the Study:
- To determine if the jp and jpmsd mutations are truly distinguishable.
- To establish a comparable genetic background for studying these allelic mutations.
- To improve myelination in organotypic culture for jp mutant mice.
Main Methods:
- Developed a B6C3H stock of jp mice on the same genetic background as jpmsd.
- Compared behavioral abnormalities, myelinated axon proportions, and in situ morphology.
- Assessed myelination capacity in organotypic culture.
Main Results:
- The new jp stock maintained original behavioral and morphological disease characteristics.
- jp-related disease remained more severe than jpmsd.
- Tissue from the new B6C3H jp stock exhibited enhanced myelination in organotypic culture.
Conclusions:
- Comparable genetic backgrounds are crucial for studying closely related mutations like jp and jpmsd.
- Enhanced myelination in culture benefits comparative studies and research on jp.
- The jp mutation continues to present a more severe phenotype than jpmsd.