Phenotypes associated with this allele
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Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Scn4am1Aaa mutation
(0 available);
any
Scn4a mutation
(70 available)
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mortality/aging
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• die by 2 days of age although born in expected numbers
• perinatal death with breathing difficulties and collapsed lungs
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muscle
N |
• muscles are morphologically normal
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respiratory system
Allelic Composition |
Scn4am1Aaa/Scn4a+
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Genetic Background |
involves: BALB/c * C57BL/6J |
|
Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Scn4am1Aaa mutation
(0 available);
any
Scn4a mutation
(70 available)
|
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mortality/aging
behavior/neurological
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• progressive deterioration in motor coordination
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• progressive deterioration
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• intermittent hind-limb immobility
• total recovery after a few seconds
• average onset of episodes is around 16 weeks in males and 25 weeks in females
• earliest onset is around weaning and the latest is around 60 weeks
• number of attacks is greater in males than in females
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muscle
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• fibers in tibialis anterior switch to more oxidative type fibers as early as 12 weeks in age
• progressive muscle pathology at 1.5 years by electron microscopy
• tubular aggregates and irregular triads
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• increased in 60 week old muscles
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• time of maximum contraction is significantly higher in 60 week tibialis anterior and extensor digitorum muscles
• high potassium levels result in significant force reduction
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• striking myotonic runs after light movement detected by electromyography regardless of the occurrence of immobility episodes
• intense EMG activity during immobility attacks
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• time of half relaxation is significantly higher in 60 week tibialis anterior and extensor digitorum muscles
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• 60 week extensor digitorum is more fatigue resistant
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• single twitch force and maximum force are reduced
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growth/size/body
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• significantly reduced weight gain after 12 weeks for males but not females
• less total fat but normal food consumption
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homeostasis/metabolism
|
Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Scn4am1Aaa mutation
(0 available);
any
Scn4a mutation
(70 available)
Scn4atm1.1Ljh mutation
(2 available);
any
Scn4a mutation
(70 available)
|
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mortality/aging
respiratory system
muscle
N |
• muscles are morphologically normal
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