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Effects of rumpshaker mutation on CNS myelin composition and structure
J Karthigasan1, E L Evans, D A Vouyiouklis
1Neurology Research, Children's Hospital, Massachusetts, USA.
Journal of Neurochemistry
|January 1, 1996
Summary
The jimpy rumpshaker (jprsh) mutation in proteolipid protein (PLP) causes reduced PLP levels and altered myelin lipids in mutant mice. This leads to wider periodicity and unstable myelin structure in the central nervous system.
Area of Science:
- Neuroscience
- Genetics
- Biochemistry
Background:
- The jimpy rumpshaker (jprsh) mutation affects the proteolipid protein (PLP) gene, crucial for central nervous system (CNS) myelin.
- Understanding the structural and biochemical consequences of PLP mutations is vital for myelin research.
Purpose of the Study:
- To investigate the impact of the jprsh mutation on myelin structure and composition in mutant mice.
- To correlate biochemical changes with observed myelin structural abnormalities.
Main Methods:
- Biochemical analysis of brain homogenates and isolated myelin using electrophoresis and immunoblotting.
- Lipid analysis via high-performance thin-layer chromatography (TLC) and densitometry.
- Structural analysis using electron microscopy and X-ray diffraction on optic nerves.
Main Results:
- Reduced levels of proteolipid protein (PLP) and altered levels of cerebrosides and sulfatides were observed in jprsh mutant mice.
- Myelin in jprsh mice exhibited a larger periodicity (5-10 Å wider) and instability, with increased period postdissection.
- Despite PLP reduction, the radial component of jprsh myelin was retained, suggesting PLP is not part of this junctional complex.
Conclusions:
- The biochemical abnormalities in jprsh mutant mice, including reduced PLP and altered lipids, directly correlate with wider myelin periodicity and reduced stability.
- These findings highlight the critical role of PLP in maintaining normal myelin packing and structural integrity in the CNS.