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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Apba2tm1.1Sud
targeted mutation 1.1, Thomas C Sudhof
MGI:3694702
Summary 3 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
cn1
Apba2tm1.1Sud/Apba2tm1.1Sud involves: 129S1/Sv * 129X1/SvJ MGI:3697716
cn2
Apba1tm1.1Sud/Apba1tm1.1Sud
Apba2tm1.1Sud/Apba2tm1.1Sud
involves: 129S1/Sv * 129X1/SvJ MGI:3694737
cn3
Apba1tm1.1Sud/Apba1tm1.1Sud
Apba2tm1.1Sud/Apba2tm1.1Sud
Apba3tm1.1Sud/Apba3tm1.1Sud
involves: 129S1/Sv * 129X1/SvJ MGI:3694739


Genotype
MGI:3697716
cn1
Allelic
Composition
Apba2tm1.1Sud/Apba2tm1.1Sud
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Apba2tm1.1Sud mutation (0 available); any Apba2 mutation (45 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
normal phenotype
• mutants are viable and fertile




Genotype
MGI:3694737
cn2
Allelic
Composition
Apba1tm1.1Sud/Apba1tm1.1Sud
Apba2tm1.1Sud/Apba2tm1.1Sud
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Apba1tm1.1Sud mutation (0 available); any Apba1 mutation (32 available)
Apba2tm1.1Sud mutation (0 available); any Apba2 mutation (45 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• double mutants display survival deficit, with only about 20% survival postnatal
• hours after birth, pups have no milk in their stomachs, become progressively weaker within twelve hours, and die within 24 hours

growth/size/body
• at 21 days of age, mutants are markedly smaller (runted) compared to littermates

behavior/neurological
• mutants display show major increases in ataxia index (area covered in 6 minutes/total distance traveled) compared to wild-type, indicating movement dysfunction

nervous system
• mutants display decreased basal synaptic strength compared to Apba1-null mice, similar to double Apba1/2 knockouts
• mutants show significant decrease in relationship between size of presynaptic fiber volley (input) and resulting field EPSCs (output) compared to Apba1-null mice indicating decreased basal synaptic strength
• repetitive stimulation produces a much higher degree of facilitation compared to Apba1-null mice




Genotype
MGI:3694739
cn3
Allelic
Composition
Apba1tm1.1Sud/Apba1tm1.1Sud
Apba2tm1.1Sud/Apba2tm1.1Sud
Apba3tm1.1Sud/Apba3tm1.1Sud
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Apba1tm1.1Sud mutation (0 available); any Apba1 mutation (32 available)
Apba2tm1.1Sud mutation (0 available); any Apba2 mutation (45 available)
Apba3tm1.1Sud mutation (0 available); any Apba3 mutation (22 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• triple mutants display survival deficit, with only ~20% survival postnatal
• hours after birth, pups have no milk in their stomachs, become progressively weaker within twelve hours, and die within 24 hours

nervous system
• mice display decreased basal synaptic strength compared to Apba1-null mice
• in culture, when neonatal neurons homozygous for floxed Apba1, Apba2 and Apba3 alleles are treated with lentiviral cre, a ~30% reduction in miniature spontaneous current frequency in both excitatory and inhibitory synapses compared to control neurons
• synaptic response to hypertonic sucrose application is significantly decreased
• in response to hypertonic sucrose, currents are decreased ~45% in cultured, cre-treated neurons
• use-dependent depression in initially decreased at excitatory synapses during repetitive 10 Hz stimulation





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last database update
12/10/2024
MGI 6.24
The Jackson Laboratory