Phenotypes associated with this allele
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Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Scn1atm1.1Swl mutation
(0 available);
any
Scn1a mutation
(114 available)
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mortality/aging
behavior/neurological
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• beginning at P9, pups exhibit an unstable gait that deteriorates progressively
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• as early as P12, pups develop spontaneous generalized tonic-clonic seizures that last from 1 to 3 min
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growth/size/body
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• by P15, mice show lower body weight than wild-type mice
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nervous system
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• as early as P12, pups develop spontaneous generalized tonic-clonic seizures that last from 1 to 3 min
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Allelic Composition |
Scn1atm1.1Swl/Scn1a+
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Genetic Background |
involves: 129S1/Sv * 129S2/SvPasCrl * 129X1/SvJ |
|
Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Scn1atm1.1Swl mutation
(0 available);
any
Scn1a mutation
(114 available)
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mortality/aging
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• Background Sensitivity: 5.4% of mice die by postnatal week 4 on the 129 background compared to 46.2% of mice on a mixed 129 and C57BL/6JNarl background
• however, most mice develop normally and are fertile
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Allelic Composition |
Scn1atm1.1Swl/Scn1a+
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Genetic Background |
involves: 129S1/Sv * 129X1/SvJ * C57BL/6JNarl |
|
Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Scn1atm1.1Swl mutation
(0 available);
any
Scn1a mutation
(114 available)
|
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mortality/aging
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• Background Sensitivity: 46.2% of mice die by postnatal week 4 on a mixed 129 and C57BL/6JNarl background compared to only 5.4% on a 129 background
• mice that have severe seizure attacks die at the average age of P21.9
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behavior/neurological
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• the threshold temperatures for hyperthermia-induced seizures are lower than in wild-type mice at postnatal week 3-5 and postnatal week 16-20, indicating increased susceptibility to hyperthermia-induced seizures
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• spontaneous epileptiform activity begins as early as P20, with mice showing generalized tonic-clonic seizures
• 44.8% of mice exhibit spontaneous seizures at P20 to P25
• average seizure duration is about 45.8 seconds and the mean latency from first seizure to death is 13.9 hours
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nervous system
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• the threshold temperatures for hyperthermia-induced seizures are lower than in wild-type mice at postnatal week 3-5 and postnatal week 16-20, indicating increased susceptibility to hyperthermia-induced seizures
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• spontaneous epileptiform activity begins as early as P20, with mice showing generalized tonic-clonic seizures
• 44.8% of mice exhibit spontaneous seizures at P20 to P25
• average seizure duration is about 45.8 seconds and the mean latency from first seizure to death is 13.9 hours
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• dentate gyrus granule cells exhibit abnormal dendritic arborization at postnatal week 4, with a reduction in the number of dendritic segments and the total dendritic length
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• dentate gyrus granule cells exhibit abnormal dendritic arborization at postnatal week 4, with a reduction in the number of dendritic segments and the total dendritic length
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• dendritic spines in dentate gyrus neurons do not undergo normal pruning during postnatal week 3 to week 4, leaving spine density unchanged
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• mice exhibit elevation in basal excitatory transmission in dente gyrate
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• in dentate gyrus granule cells, the frequency of spontaneous EPSC is increased
• however, sEPSC amplitude is normal
• mEPSCs show a higher frequency in dentate gyrus granule cells in the presence of the sodium channel blocker TTX, however mEPSC amplitude is similar to controls
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• in dentate gyrus granule cells, the frequency of sIPSCs is reduced
• however, sIPSC amplitude is normal
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• synaptic response of brief paired stimuli with 50 ms intervals indicates a lower paired-pulse ratio than in controls suggesting elevated release probability of excitatory terminals in granule cells
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