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

Two forms of phospholipase C-beta 1 generated by alternative splicing.

Phospholipase C-beta 1 (PLC-beta 1) exists as two immunologically indistinguishable polypeptides of 150 and 140 kDa and is encoded in rat brain by two distinct transcripts of 5.4 and 7.2 kilobases (kb). cDNA corresponding to the entire 5.4-kb transcript as reported previously reveals an open reading frame that is capable of coding a 1216-amino acid polypeptide (Suh, P. G., Ryu, S. H., Moon, K. H., Suh, H. W., and Rhee, S. G. (1988) Cell 54, 161-169). We have now isolated cDNAs corresponding to the entire 7.2-kb transcript from a rat brain cDNA library. The 7.2-kb transcript differs from the previously reported 5.4-kb transcript by possessing both an additional 118 nucleotides located near the end of the coding sequence and a 1738-nucleotide extension of the 3'-flanking region. The presence of the 118-nucleotide insert in the cumulative 7.2-kb sequence gives rise to an open reading frame that is capable of coding a 1173-amino acid polypeptide (PLC-beta 1b), the carboxyl-terminal sequence of which differs from that of the 1216-amino acid polypeptide (PLC-beta 1a) derived from the 5.4-kb transcript. Antibodies were raised against synthetic peptides corresponding to the carboxyl-terminal portions of PLC-beta 1a and PLC-beta 1b. Immunoblot analysis with these isozyme-specific antibodies revealed that both PLC-beta 1a and PLC-beta 1b are expressed in rat brain and C6Bu-1 glioma cells and that PLC-beta 1a and PLC-beta 1b correspond to the previously identified 150- and 140-kDa PLC-beta 1 enzymes, respectively. Analysis of PLC-beta 1 genomic DNA indicates that PLC-beta 1a and PLC-beta 1b are derived from a single gene by alternative RNA splicing.[1]


  1. Two forms of phospholipase C-beta 1 generated by alternative splicing. Bahk, Y.Y., Lee, Y.H., Lee, T.G., Seo, J., Ryu, S.H., Suh, P.G. J. Biol. Chem. (1994) [Pubmed]
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