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Flash visual evoked potentials in the hypomyelinated mutant mouse shiverer.

Donna M Lehman¹, Joseph M Harrison

¹Department of Ophthalmology, The University of Texas Health Science Center, San Antonio 78229-3900, USA.

Documenta Ophthalmologica. Advances in Ophthalmology

|April 13, 2002

Summary

Shiverer mutant mice lacking myelin basic protein (MBP) show delayed visual evoked potentials (FVEPs). This suggests hypomyelination impairs central nervous system visual pathway function.

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Area of Science:

Neuroscience
Genetics
Ophthalmology

Background:

Myelin basic protein (MBP) is crucial for central nervous system (CNS) myelin.
Shiverer mutant mice lack detectable MBP and exhibit CNS hypomyelination.
The impact of this hypomyelination on visual pathway function remains unstudied.

Purpose of the Study:

To investigate visual pathway dysfunction in shiverer mutant mice.
To characterize alterations in flash visual evoked potentials (FVEPs) associated with MBP deficiency.

Main Methods:

Comparison of FVEPs between shiverer homozygotes and wild-type littermates.
Analysis of implicit times and amplitudes of FVEP components.

Main Results:

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Statistically significant delays were observed in FVEP components peaking at 85 ms and 170 ms in shiverer mice.

No significant differences in FVEP component amplitudes were found between shiverer and wild-type mice.

Conclusions:

Delayed FVEPs in shiverer mice likely result from hypomyelination affecting optic nerve, tract, and visual radiations.
This indicates impaired conduction time and post-synaptic delays within the visual pathway due to MBP deficiency.