Phenotypes associated with this allele
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Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Cacna1atg-rol mutation
(1 available);
any
Cacna1a mutation
(115 available)
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growth/size/body
homeostasis/metabolism
nervous system
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• cerebellum wet weight is 76% of controls
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• mice show marked increases in local cerebral glucose utilization in the structures of the basal ganglia such as globus pallidus, entopeduncular nucleus, substantia nigra pars compacta and pars reticulata, and subthalamic nucleus, and some increase in the limbic system and brainstem such as the CA1 and CA3 region of the hippocampus, lateral habenula, pedunculopontine nucleus, red nucleus, and ventral tegmental area, indicating a basal ganglia dysfunction
• no alternation in local cerebral glucose utilization in the cerebellum
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Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Cacna1atg-rol mutation
(1 available);
any
Cacna1a mutation
(115 available)
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mortality/aging
N |
• Background Sensitivity: viability is background dependent
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cellular
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• greater numbers of TUNEL-positive cells are detected in the granule cell layer of mutant mice than are found in wild-type (22.1 cells/section in mutants vs 4.6 cells/section in wild-type) at 20 days of age; there is no difference in numbers of apoptotic cells seen at 10 or 15 days
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behavior/neurological
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• homozygous mice are identifiable between 10 and 14 days of age by a creeping or rolling gait
(J:12735)
• mice show ataxic behavior around P10
(J:109231)
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• at 10-14 days of age, poor motor control of the hindlimbs can be observed
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• mutants born on an inbred background are weak, but when crossed to produce congenic or co-isogenic lines, mice are more viable
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• females have a reduced ability to nurse pups
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nervous system
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• net weight of the brain stem is slightly reduced
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• in mutant mice, many apoptotic granule cells are seen in the cerebellum at 20 days of age
(J:107924)
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• cerebellum weight is reduced to 75% of the controls
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• regional atrophy is observed in the anterior lobe of the cerebellum in mutants
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• size ratio of cerebellum to cerebrum in mutants is 0.35 in medial-dorsal aspect and 0.25 mid-sagitally compared to 0.40 and 0.30 respectively in wild-type, indicating cerebellar hypoplasia
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• application of AMPA to acutely dissociated Purkinje cells results in larger maximum inward current densities at lower AMPA concentrations than in wild-type or Cacna1tg homozygotes
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• parallel fiber (PF) stimulation is less effective in eliciting EPSCs (PF-EPSC) in ataxic mutants than in wild-type at stimulation intensities of 3-15 Volts
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• decay time constant of climbing fiber-EPSCs (CF-EPSC) is significantly greater than in wild-type or Cacna1tg homozygotes; rise times of CF-EPSCs of both mutant strains and wild-type are not significantly different
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• miniature EPSCs have a larger decay time constant than wild-type or Cacna1tg homozygotes
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• paired-pulse facilitation (PPF) magnitudes are significantly greater at 50 msec interpulse intervals than in wild-type Cacna1tg homozygotes
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reproductive system
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• females are fertile but do not breed well
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muscle
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• muscles are very sensitive to low calcium, with contractions of flexor digitorium brevis muscles decreasing to about 40% in presence of 0.5 mM calcium
• flexor digitorium brevis muscles are more sensitive to low calcium than diaphragms
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• weakness of fast leg muscle
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homeostasis/metabolism
Allelic Composition |
Cacna1atg-rol/Cacna1a+
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Genetic Background |
involves: C3Hf/Nga * C57BL/6 * SIII |
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Find Mice |
Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Cacna1atg-rol mutation
(1 available);
any
Cacna1a mutation
(115 available)
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|
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homeostasis/metabolism
nervous system
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• mice show an intermediate increase in local cerebral glucose utilization in the basal ganglia structures such as the globus pallidus, substantia nigra pars reticulata, and subthalamic nucleus
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mortality/aging
behavior/neurological
N |
• mutants do not exhibit epileptiform seizures that are seen in single homozygous Cacna1atg mice
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• develop wobbly gait that is similar to that of single homozygous Cacna1atg-rol but more severe than in single homozygous Cacna1atg mice
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nervous system
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• neuromuscular disorder appears at 2 weeks of age, at a similar time frame as in single homozygous Cacna1atg-rol mice
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