homeostasis/metabolism
nervous system
• mice develop a late-onset white matter dystrophy characterized by myelin-associated vacuoles and astrocytic swelling
• however, mice do not exhibit macrocephaly
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• cerebellum is edematous at 12 months of age
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• vacuoles are seen in the cerebellar white matter by 10 months of age, which are large by 12 months, and expanded throughout the white matter structures, including the corpus callosum, axon bundles of the striatum, mesencephalic reticulum, superior colliculus, and the olfactory and optic tracts, by 15 months
• vacuole formation is not seen in the gray matter
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• swollen astrocytes characterized by electron-lucent endfeet are opposed to vessels
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• aged (15 months) mice have 1.2% and 0.3% of myelinated axons in the cerebellar white matter and callosum with abnormal myelin, respectively
• intra-myelin splitting occurs and vacuoles form in the myelin sheath
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behavior/neurological
N |
• mice do not show any behavioral abnormalities
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