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Cacna1atg-la
Spontaneous Allele Detail
Nomenclature
Symbol: Cacna1atg-la
Name: calcium channel, voltage-dependent, P/Q type, alpha 1A subunit; leaner
MGI ID: MGI:1856210
Synonyms: Cacna1ala, Ln, tgla
Gene: Cacna1a  Location: Chr8:84338639-84640246 bp, + strand  Genetic Position: Chr8, 40.95 cM
Mutation
origin
Strain of Origin:  AKR/J
Mutation
description
Allele Type:    Spontaneous (Not Specified)
Mutation:    Single point mutation
 
Mutation detailsThis mutant allele comprises a G-to-A nucleotide substitution, changing the splice donor consensus sequence at the 5' end of intron 42 from G-gt to G-at. This abolishes or greatly reduces the efficiency of the splice site and results in aberrant transcripts that skip exon 42 or retain intron 42, both of wich are out-of-frame alterations. (J:36596)
Inheritance:    Recessive
Phenotypes
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View phenotypes and curated references for all genotypes (concatenated display).
Expression
In Mice Carrying this Mutation: 36 assay results
Find Mice (IMSR)
Mouse strains and cell lines available from the International Mouse Strain Resource (IMSR)
Carrying this Mutation:  Mouse Strains: 1 strain available      Cell Lines: 0 lines available
Carrying any Cacna1a Mutation:  42 strains or lines available
Notes
Cacna1atg-la, leaner, recessive. The leaner mutation arose spontaneously in the AKR/J strain. Homozygotes are recognized at 8 to 10 days of age by ataxia, stiffness, and retarded motor activity. Adults are characterized by instability of the trunk, and hypertonia of trunk and limb muscles. Seizures have not been observed (J:28459). Heterozygous Cacna1atg-la/Cacna1atg mice show ataxia, stiffness, and retarded motor activity at 15 to 17 days of age. Within a few days they develop a wobbly gait and intermittent focal seizures that continue throughout life (J:5240). The cerebellum is reduced in size, particularly in the anterior region, in Cacna1atg-la homozygous mice (J:28459). There is loss of granule cells beginning at 10 days of age and loss of Purkinje and Golgi cells beginning after 1 month. Cell loss later slows but continues throughout life. Granule and Purkinje cells are more severely affected than Golgi cells and the anterior folia more severely affected than other parts of the cerebellum (J:6909). Heckroth and Abbott (J:20921) found loss of Purkinje cells from alternating sagittal zones of the cerebellum in Cacna1atg-la homozygotes. The cerebellum of Cacna1atg-la/Cacna1atg heterozygotes shows shrinkage and degenerative changes of the Purkinje cells (J:5240). The loss in cerebellar volume in these and in homozygous Cacna1atg mice is specific to the molecular layer, with no change in volume of the granule cell or white matter layers (J:22482). Many Cacna1atg-la homozygotes die at weaning time, but some survive and females may breed (J:28459).
References
Original:  J:13510 Southard JL, Leaner (la). Mouse News Lett. 1970;43:33
All:  44 reference(s)

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)
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last database update
04/13/2021
MGI 6.16
The Jackson Laboratory