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- W2079392637 abstract "CD45, also known as LCA, is a transmembrane protein tyrosine phosphatase encoded by the PTPRC gene. In mammals, it plays an important role in T and B cell receptor and cytokine signaling by maintaining receptor associated kinases in an active state. A prominent CD45 feature is alternative splicing of exons encoding the N-terminus, resulting in the generation of several isoforms. The expression of isoforms is tightly regulated and dependent on the developmental/activation state of the lymphocyte. Nevertheless, the significance of these multiple isoforms in mammals is poorly understood. In this study, the channel catfish CD45 homolog was sequenced and found to be similar to CD45 of other species. However, unlike mammalian CD45, it appears that up to 13 exons are used in producing multiple alternatively spliced CD45 variants in catfish cells. These 13 alternatively spliced exons variably encode for O-linked glycosylation sites. Several of the exons are identical or very similar, suggesting gene duplication of a block of four exons. As demonstrated by RT-PCR, many of the alternatively spliced forms of catfish CD45 are differentially expressed in lymphoid cell lines with B cells expressing larger isoforms than do T cells. Furthermore, immunoprecipitation experiments utilizing anti-catfish CD45 mAbs substantiated that different size CD45 isoforms are expressed at the protein level on catfish T and B cells." @default.
- W2079392637 created "2016-06-24" @default.
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- W2079392637 date "2004-08-01" @default.
- W2079392637 modified "2023-10-14" @default.
- W2079392637 title "Organization and expression of thirteen alternatively spliced exons in catfish CD45 homologs" @default.
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- W2079392637 doi "https://doi.org/10.1016/j.dci.2004.04.004" @default.
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