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

Cloning and identification of two novel splice variants of human PD-L2.

PD-L2, a newly identified member of B7 family, plays a role in down-regulating T cell responses. The common PD-L2 mRNA (type I) is the splicing product containing all 6 exons. We report here the identification of two human PD-L2 splice variants in activated leukocytes. One splice variant (type II) is generated through splicing out exon 3 encoding Ig constant-like domain; it retains all other regions without a frame shift. The other variant (type III) is created by splicing out exon 3 to an alternative acceptor site 5 bp downstream of the canonical acceptor site, leading to a frame shift. Consequently, the translated protein should be a soluble form. Furthermore, type I isoform is expressed on the plasma surface whereas type II isoform showed a pattern of intracellular membrane distribution in the transiently transfected K562 cells. In addition, the expression patterns of PD-L2 splice variants are variable in different individuals and distinct cellular status. These results suggest that PD-L2 expression may be controlled by posttranscriptional regulation through alternative splicing, and modulation of PD-L2 isoform expression may influence the outcome of immune response.[1]


  1. Cloning and identification of two novel splice variants of human PD-L2. He, X.H., Liu, Y., Xu, L.H., Zeng, Y.Y. Acta Biochim. Biophys. Sin. (Shanghai) (2004) [Pubmed]
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