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XB-ART-43355
Immunogenetics 2011 Oct 01;6310:679-89. doi: 10.1007/s00251-011-0544-6.
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Expansion and diversification of the signaling capabilities of the CD2/SLAM family in Xenopodinae amphibians.

Guselnikov SV , Laktionov PP , Najakshin AM , Baranov KO , Taranin AV .


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We studied the evolution of the CD2 family in tetrapods by extracting and analyzing CD2-like genes from the genome of the amphibian species Silurana (Xenopus) tropicalis. An exhaustive analysis of the genomic and cDNA databases resulted in the identification of at least 70 CD2-like genes. The predicted receptors mostly maintain the typical VC2 ectodomains, but are highly diverse in their C-termini, which suggests a broad range of signaling capacities. Apart from the presumed monomeric receptors with ITSM and/or ITIM motifs, the Silurana family includes secreted proteins. Furthermore, a fraction of the receptors contain a conserved TM subtype with the NxxR motif that is known to promote an association with the FcRγ subunit and that was previously found in the members of the FcR- and KIR-related receptors. The expression analysis of a sample of the genes showed broad tissue distribution and gene-specific expression patterns. Phylogenetic analysis predicted that the CD58, CD150/SLAM, and SLAMF8 genes were maintained as single-copy genes in both mammals and amphibians, while others expanded/contracted in a lineage-specific manner.

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Species referenced: Xenopus tropicalis
Genes referenced: cd58 slamf8

References [+] :
Brown, 2B4, the natural killer and T cell immunoglobulin superfamily surface protein, is a ligand for CD48. 1998, Pubmed