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Phenotypes Associated with This Genotype
Genotype
MGI:3811208
Allelic
Composition
Hspg2tm1.1Soni/Hspg2tm1.1Soni
Genetic
Background
involves: 129S/SvEv * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Hspg2tm1.1Soni mutation (0 available); any Hspg2 mutation (198 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• mice die by 24 months of age

nervous system
• mice exhibit denervation and reinnervation in the neuromuscular junctions (NMJs)
• 96% of mice exhibit NMJ remodeling unlike in wild-type mice
• NMJs cover 58% of the area covered by wild-type NMJs
• mice exhibit prolonged decay time of potentiation of muscle force compared to in wild-type mice
• the twitch/tetanus ratio is 30% higher than in wild-type mice at low frequencies
• however, twitch/tetanus ration is normal at high frequencies
• mice exhibit decreased frequency and prolonged decay of miniature endplate potential compared to in wild-type mice

muscle
• no evidence of mononuclear infiltrate or necrotic fibers are present
• at 6 months of age, mice exhibit variability in skeletal muscle fiber size
• at 6 months of age, mice exhibit centralized nuclei in skeletal muscle fibers
• at 6 months of age, mice exhibit a predominance of type 1 skeletal muscle fibers
• skeletal muscles exhibit spontaneous muscle activity at rest on an electromyogram unlike in wild-type mice
• however, no spontaneous activity is observed in the diaphragm

skeleton
• mice exhibit hip dysplasia

growth/size/body
• mice exhibit a decrease in body weight compared to in Hspg2tm1.1Soni homozygotes and wild-type mice
• mice are 15% shorter than wild-type mice

behavior/neurological
• at 2 months of age, mice display stiffened flexion of the hindlimbs when suspended by the tail, unlike in wild-type mice, that is more severe than in Hspg2tm1.1Soni homozygotes
• at 6 months of age 54% of mice exhibit strong stiffened flexion of the hindlimbs and 31% mild stiffened flexion of the hindlimbs when suspended by the tail

vision/eye
• at 2 months of age, mice exhibit a delay in eyelid opening that is more severe than in Hspg2tm1.1Soni homozygotes
• at 6 months of age, 54% of mice have constantly closed eyes

Mouse Models of Human Disease
OMIM ID Ref(s)
Schwartz-Jampel Syndrome, Type 1; SJS1 255800 J:139975


Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Tumor Biology (MTB), Gene Ontology (GO), MouseCyc
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last database update
06/15/2016
MGI 6.04
The Jackson Laboratory