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Ganguly, K. ; Favor, J. ; Neuhäuser-Klaus, A. ; Sandulache, R. ; Puk, O. ; Beckers, J. ; Horsch, M. ; Schädler, S. ; Vogt Weisenhorn, D.M. ; Wurst, W. ; Graw, J.

Novel allele of crybb2 in the mouse and its expression in the brain.

Invest. Ophthalmol. Vis. Sci. 49, 1533-1541 (2008)
DOI
Open Access Gold as soon as Publ. Version/Full Text is submitted to ZB.
O377 was identified as a new dominant cataract mutation in mice after radiation experiments. The purpose of this study was to genetically characterize the mutation and to analyze its biological consequences. METHODS: Linkage analysis of the O377 mouse mutant was performed; candidate genes including Crybb2 were sequenced. The authors analyzed eyes and brains of the mutants by histology and the expression domains of Crybb2 by in situ hybridization and immunohistochemistry. RNA was isolated from whole brains of heterozygous and homozygous O377 mutants, and differential expression arrays were performed. All studies were compared with age- and strain-matched wild-type mice. RESULTS: The mutation was mapped to chromosome 5 and characterized as an A-->T substitution at the end of intron 5 of the Crybb2 gene. It led to alternative splicing with a 57-bp insertion in the mRNA and to 19 additional amino acids in the protein. In the brain, betaB2-crystallin was expressed in the cerebellum, olfactory bulb, cerebral cortex, and hippocampus. The only morphologic difference in the brain is the increased number of Purkinje cells in the cerebellum of homozygous strain-matched mutants. Differential expression analysis revealed the upregulation of calpain-3 in the brain of homozygous mutants, which was confirmed by quantitative real-time PCR. CONCLUSIONS: These results confirm the third allele of Crybb2 in the mouse that also affected exon 6 and the fourth Greek key motif. Moreover, expression analysis of Crybb2 identified for the first time distinct regions of expression in the brain, and the differential expression analysis points to the participation of Ca(2+) in the corresponding pathologic processes.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
ISSN (print) / ISBN 0146-0404
e-ISSN 1552-5783
Journal Investigative Ophthalmology & Visual Science, IOVS
Quellenangaben Volume: 49, Issue: 4, Pages: 1533-1541 Article Number: , Supplement: ,
Publisher Association for Research in Vision and Ophthalmology (ARVO)
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Developmental Genetics (IDG)
Institute of Experimental Genetics (IEG)
Institute of Human Genetics (IHG)