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Phenotypes Associated with This Genotype
Genotype
MGI:5644693
Allelic
Composition
Meox2tm1(cre)Sor/Meox2+
Tg(CAG-lacZ,-FUS*R521G,-EGFP)682Gyu/0
Genetic
Background
involves: 129S4/SvJaeSor * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Meox2tm1(cre)Sor mutation (3 available); any Meox2 mutation (5 available)
Tg(CAG-lacZ,-FUS*R521G,-EGFP)682Gyu mutation (0 available)
phenotype observed in females
phenotype observed in males
N normal phenotype

Tg(CAG-lacZ,-FUS*R521G,-EGFP)682Gyu/0 Meox2tm1(cre)Sor/Meox2+ mice display hindlimb curl

mortality/aging
• about 50% of mice die before P30

growth/size/body
• mice that survive past P30 exhibit reduced body mass

behavior/neurological
• mice that survive past P30 display a subtle motor impairment
• mice exhibit reduced righting ability, however to a lesser extent than in conditional Tg(CAG-lacZ,-FUS,-EGFP)629Gyu mice
• mice exhibit hindlimb clasping, but to a lesser extent than in conditional Tg(CAG-lacZ,-FUS,-EGFP)629Gyu mice
• on the rotarod, mice that escape early lethality show normal performance on day 1 of testing, however show impaired motor function on day 2 of testing
• mice exhibit reduced grip strength, however to a lesser extent than in conditional Tg(CAG-lacZ,-FUS,-EGFP)629Gyu mice
• mice that escape early lethality show less activity over a 9-day period on voluntary running wheels
• however, food intake is not altered
• mice develop gait abnormalities that are less severe than in conditional Tg(CAG-lacZ,-FUS,-EGFP)629Gyu mice
• gait analysis of mice that escape early lethality shows that the braking phase is greater in the forelimbs and the swing phase is reduced in the hindlimbs
• in the ladder-walking test, the forelimbs of mice that escape early lethality have more errors in stepping with few deficits in the hindlimbs
• interaction with juvenile mice is reduced at 4 months of age
• when introduced to intruder adult mice, mutants do not show any deficits before 8 months of age, at which time they show reduced chasing behavior

muscle
• end-stage mutants exhibit scattered and grouped atrophic muscle fibers, although to a lower extent than in conditional Tg(CAG-lacZ,-FUS,-EGFP)629Gyu mice

nervous system
• mice that die by P30 exhibit activation of microglia in the brain and spinal cord
• however, mice that escape early lethality do not exhibit microglial and astrocyte activation in the brain and spinal cord
• mice also do not exhibit degeneration of axons in the dorsal corticospinal tract or lateral columns, or in the dorsal or ventral roots, indicating that descending motor axons are not altered, show no motor neuron loss in the cervical spinal cord, and no FUS protein aggregates in the brain or spinal cords
• mice that die by P30 exhibit activation of astrocytes in the brain and spinal cord
• dendritic intersections and cumulative area of dendrites are reduced in spinal motor neurons at P18 and these deficits are significant and persistent at P60
• fewer intersections and reduced cumulative area in the apical and basal dendrites in neurons of sensorimotor cortex layers IV-V at P18 and P60
• decrease in the number and density of mature spines
• end-stage mutants show abnormalities and degeneration of neuromuscular junctions

hematopoietic system
• mice that die by P30 exhibit activation of microglia in the brain and spinal cord
• however, mice that escape early lethality do not exhibit microglial and astrocyte activation in the brain and spinal cord
• mice also do not exhibit degeneration of axons in the dorsal corticospinal tract or lateral columns, or in the dorsal or ventral roots, indicating that descending motor axons are not altered, show no motor neuron loss in the cervical spinal cord, and no FUS protein aggregates in the brain or spinal cords

immune system
• mice that die by P30 exhibit activation of microglia in the brain and spinal cord
• however, mice that escape early lethality do not exhibit microglial and astrocyte activation in the brain and spinal cord
• mice also do not exhibit degeneration of axons in the dorsal corticospinal tract or lateral columns, or in the dorsal or ventral roots, indicating that descending motor axons are not altered, show no motor neuron loss in the cervical spinal cord, and no FUS protein aggregates in the brain or spinal cords

taste/olfaction
N
• mice exhibit normal olfaction and cognitive function

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
amyotrophic lateral sclerosis type 6 DOID:0060198 OMIM:608030
J:216672


Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB), Gene Ontology (GO)
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last database update
07/29/2020
MGI 6.15
The Jackson Laboratory