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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Structure of mouse calpastatin isoforms: implications of species-common and species-specific alternative splicing.

Mouse calpastatin cDNAs were cloned by the method of RT-PCR using RNA isolated from myoblast C2C12 cells. Nucleotide sequencing of the isolated clones revealed an in-frame ATG codon upstream of the previously assigned translation initiation methionine. Except for the N-terminal segment, the new translatable region (domain XL) was similar to the sequence of bovine calpastatin in which domain XL was first identified. Among the isolated mouse calpastatin cDNA clones, three isoforms (mCS-a, mCS-b, and mCS-c) were identified. In domain L, mCS-b had a deletion of the region corresponding to exon 3 of the human calpastatin gene. RT-PCR analyses of various mouse tissues revealed that mCS-b was the major form and that the content of mCS-a, nondeleted form, was 5-10% in tissues including skeletal muscle, liver, brain, etc. and about 30% in the myoblast C2C12 cells. Unlike human and rat cDNAs, no other deletions were detected in mouse calpastatin domain L. Isolation of the cDNA clone of mCS-c, which lacked regions corresponding to exons 3 and 12, was obtained by chance because its expression level was under the detectable level in the mouse tissues and even in C2C12 cells.[1]

References

  1. Structure of mouse calpastatin isoforms: implications of species-common and species-specific alternative splicing. Takano, J., Kawamura, T., Murase, M., Hitomi, K., Maki, M. Biochem. Biophys. Res. Commun. (1999) [Pubmed]
 
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