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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Itpr1tm1.1Kmik
targeted mutation 1.1, Katsuhiko Mikoshiba
MGI:5532199
Summary 2 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
cn1
Itpr1tm1.1Kmik/Itpr1tm1.1Kmik
Tg(Pcp2-cre)2Mpin/0
involves: 129S/SvEv * 129S1/Sv * 129X1/SvJ * C57BL/6J MGI:5532284
cn2
Itpr1tm1.1Kmik/Itpr1tm1.1Kmik
Tg(Pcp2-cre)2Mpin/0
Tg(Pcp2-EGFP)2Yuza/0
involves: 129S/SvEv * 129S1/Sv * 129X1/SvJ * C57BL/6J * FVB/N MGI:5532285


Genotype
MGI:5532284
cn1
Allelic
Composition
Itpr1tm1.1Kmik/Itpr1tm1.1Kmik
Tg(Pcp2-cre)2Mpin/0
Genetic
Background
involves: 129S/SvEv * 129S1/Sv * 129X1/SvJ * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Itpr1tm1.1Kmik mutation (3 available); any Itpr1 mutation (180 available)
Tg(Pcp2-cre)2Mpin mutation (1 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
N
• born at expected Mendelian ratios
• survive to adulthood

behavior/neurological
N
• no seizure-like movements
• cerebellar ataxia beginning around 6 weeks of age
• worsens over time
• smaller amplitude of horizontal optico kinetic reflex gain but timing is normal
• no adaptive increase in horizontal optico kinetic reflex gain at 10 weeks after 1 hour of exposure to screen oscillations

nervous system
N
• cerebellar morphology is more or less normal
• climbing fiber distribution is normal at 10 weeks of age
• no abnormal enlargement of parallel fiber presynaptic terminals
• fewer dendritic branching points
• increased spine density in the distal dendritic region
• soma is smaller at 10 weeks of age but no degeneration is apparent
• thin at 10 weeks of age
• significantly increased parallel fiber EPSP at 10 weeks of age
• induction of long term depression by stimulation of parallel fibers and climbing fibers is blocked
• long term depression by direct depolarization of Purkinje cells is blocked

vision/eye
• smaller amplitude of horizontal optico kinetic reflex gain but timing is normal
• no adaptive increase in horizontal optico kinetic reflex gain at 10 weeks after 1 hour of exposure to screen oscillations




Genotype
MGI:5532285
cn2
Allelic
Composition
Itpr1tm1.1Kmik/Itpr1tm1.1Kmik
Tg(Pcp2-cre)2Mpin/0
Tg(Pcp2-EGFP)2Yuza/0
Genetic
Background
involves: 129S/SvEv * 129S1/Sv * 129X1/SvJ * C57BL/6J * FVB/N
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Itpr1tm1.1Kmik mutation (3 available); any Itpr1 mutation (180 available)
Tg(Pcp2-cre)2Mpin mutation (1 available)
Tg(Pcp2-EGFP)2Yuza mutation (1 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
nervous system
N
• percentage of purkinje fibers synapsing with parallel fibers is normal
• distal spine density is 143% of controls
• spine lengths are greater





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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
05/07/2024
MGI 6.23
The Jackson Laboratory