A novel neurological mutant mouse, yotari, which exhibits reeler-like phenotype but expresses CR-50 antigen/reelin

Neuroscience Research
H YoneshimaKatsuhiko Mikoshiba

Abstract

We present yotari, a novel neurological mutant mouse whose mutation is transmitted in an autosomal recessive manner. The phenotype of yotari is very similar to that of reeler. yotari mutants are recognizable by their unstable gait and tremor and by their early deaths at around the time of weaning. The cerebella of homozygous yotari are hypoplastic and have no foliation. A molecular and a granular cell layer can be identified, but Purkinje cells are scattered throughout both the granular layer and white matter. The laminar structure of the cerebral cortex and the hippocampal formation are also distorted. To test whether the mutated gene in yotari is the reeler gene, reelin, yotari heterozygotes were mated with reeler homozygotes or heterozygotes. The absence of abnormal offspring indicated that the yotari gene is distinct from reelin. Furthermore, expression of mRNA and protein of reelin was verified by Northern blotting and immunohistochemistry using a CR-50 monoclonal antibody (mAb) which is specific to Reelin, the reelin gene product. Although the mutation of several genes, including cyclin-dependent kinase 5 (Cdk 5), p35 and LIS1, 45 kDa subunits of platelet-activating factor acetylhydrolase (PAF-AH) Ib, in Miller-Dieker lis...Continue Reading

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