Phenotypes Associated with This Genotype

Genotype
MGI:6160484

• Allelic Composition: Eif2b5^tm1.1Vdk/Eif2b5^tm1.1Vdk
• Genetic Background: involves: C57BL/6 * C57BL/6J

• ♀: phenotype observed in females
• ♂: phenotype observed in males
• N: normal phenotype

mortality/aging

premature death ( J:234659 )

• mice die by 7-10 months of age

growth/size/body

decreased body weight ( J:234659 )

behavior/neurological

ataxia ( J:234659 )

• mice develop progressive gait ataxia

impaired coordination ( J:234659 )

• mice show increased latency and an increased number of foot slips when traversing a narrow beam

decreased grip strength ( J:234659 )

• reduced grip strength at 5 months of age

abnormal locomotor activation ( J:234659 )

• in an automated home cage, mice show longer arrests at 2 and 5 months of age and reduced activity per time interval with respect to dark/light phase at 5 months

sporadic seizures ( J:234659 )

• mice exhibit sporadic epileptic seizures

nervous system

sporadic seizures ( J:234659 )

• mice exhibit sporadic epileptic seizures

abnormal cerebellum white matter morphology ( J:234659 )

• mice develop an intermediate severity of vanishing white matter disease

• white matter shows perturbed myelination and progressive vacuolization without microglial activation from 5 months of age

abnormal forebrain morphology ( J:234659 )

• hyaluronan is increased in 7 month old forebrain

ectopic Bergmann glia cells ( J:234659 )

• 5 and 7 month old mice show an increased number of Bergmann glia mislocalized to the molecular layer of the cerebellar cortex that have abnormally oriented, thicker, and more intensely GFAPdelta-immunoreactive processes than wild-type

brain vacuoles ( J:234659 )

• white matter shows progressive vacuolization; vacuoles are surrounded by myelin strands indicating that they are intramyelinic

abnormal astrocyte morphology ( J:234659 )

• white matter astrocytes are immature and have an abnormal morphology with abnormally blunt processes and intermediate filament composition

• the number of immature astrocytes is increased

decreased oligodendrocyte number ( J:234659 )

• number of mature oligodendrocytes is decreased

• however, oligodendrocyte morphology is normal

abnormal axon morphology ( J:234659 )

• the corpus callosum shows decreased mean axonal diameter, with an increased percentage of small-caliber axons at 7 months of age

abnormal myelination ( J:234659 )

• white matter shows perturbed myelination, with vacuoles surrounded by myelin sheaths, and splitting occurring at the intraperiod line, indicating intramyelinic edema

• expression of myelin proteins is decreased, indicating that myelin deposition is deficient and myelin maturation is already delayed by P21 before clinical disease onset

vision/eye

abnormal retina morphology ( J:234659 )

• mice show signs of retinal laminar disorganization

• retinal changes include uneven margins of the inner and outer nuclear layers with a thinned inner plexiform layer, ectopic inner nuclear cells, and displaced granule cells from the outer nuclear layer to the photoreceptor layer

abnormal retina inner nuclear layer morphology ( J:234659 )

• uneven margins of the inner nuclear layer

thin retina inner plexiform layer ( J:234659 )

abnormal retina outer nuclear layer morphology ( J:234659 )

• uneven margins of the outer nuclear layer

homeostasis/metabolism

increased hyaluronic acid level ( J:234659 )

• hyaluronan is increased in 7 month old forebrain

Mouse Models of Human Disease		DO ID	OMIM ID(s)	Ref(s)
leukoencephalopathy with vanishing white matter		DOID:0060868	OMIM:PS603896	J:234659