About   Help   FAQ
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 (184 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 (184 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





Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB)), Gene Ontology (GO)
Citing These Resources
Funding Information
Warranty Disclaimer, Privacy Notice, Licensing, & Copyright
Send questions and comments to User Support.
last database update
11/12/2024
MGI 6.24
The Jackson Laboratory