Abstract
The major histocompatibility complex (MHC) class II invariant chains are important for an efficient and complete presentation of antigens by MHC class II molecules. Invariant chain-like proteins (Iclp) 1 and 2 were identified by expressed sequence tag analysis from cDNA library of common carp head kidney (HK) stimulated with concanavalin A and lipopolysaccharide. The sequences were 1043 and 1016 bp in length encoding 234 and 198 amino acid proteins, respectively. Based on their predicted structure, the genes harboured transmembrane domain (TMD) and Tg (thyroglobulin) type 1 domains. Expression analysis revealed that both genes were expressed in normal tissues of HK, intestine, brain and gill. By database search, similar homologues were found in Atlantic salmon, fugu and catfish. Phylogenetic and alignment analysis indicate diversity among fish Iclps.
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