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* Department of Microbiology and Immunology, University of Maryland School of Medicine, and
Molecular and Cellular Biology Program, University of Maryland Graduate School, Baltimore, MD 21201;
Department of Research, University of Basel, Basel, Switzerland;
School of Biological Sciences, Washington State University, Vancouver, WA 98686;
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Scottish Fish Immunology Research Centre, Zoology Building, Aberdeen University, Aberdeen, Scotland, United Kingdom; and
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Department of Pathobiology, University of Washington, Seattle, WA 98195
Dendritic cells are one of the most important cell types connecting innate and adaptive immunity, but very little is known about their evolutionary origins. To begin to study dendritic cells from lower vertebrates, we isolated and characterized CD83 from the nurse shark (Ginglymostoma cirratum (Gici)) and rainbow trout (Oncorhynchus mykiss (Onmy)). The open reading frames for Gici-CD83 (194 aa) and Onmy-CD83 (218 aa) display 
28–32% identity to mammalian CD83 with the presence of two conserved N-linked glycosylation sites. Identical with mammalian CD83 genes, Gici-CD83 is composed of five exons including conservation of phase for the splice sites. Mammalian CD83 genes contain a split Ig superfamily V domain that represents a unique sequence feature for CD83 genes, a feature conserved in both Gici- and Onmy-CD83. Gici-CD83 and Onmy-CD83 are not linked to the MHC, an attribute shared with mouse but not human CD83. Gici-CD83 is expressed rather ubiquitously with highest levels in the epigonal tissue, a primary site for lymphopoiesis in the nurse shark, whereas Onmy-CD83 mRNA expression largely paralleled that of MHC class II but at lower levels. Finally, Onmy-CD83 gene expression is up-regulated in virus-infected trout, and the promoter is responsive to trout IFN regulatory factor-1. These results suggest that the role of CD83, an adhesion molecule for cell-mediated immunity, has been conserved over 450 million years of vertebrate evolution.
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