Abstract
Fish skin and its corresponding mucus are important defenses against infections from pathogenic organisms, and several types of defensive molecules, particularly lectins, are often found in mucus. Freshwater eels of the genus Anguilla are widely distributed throughout the world, and the genus currently contains 16 species plus 3 subspecies. In this work, genomic sequences of skin mucus C-type lectin-encoding genes from all 19 presently known species/subspecies of the genus Anguilla were determined. The nucleotide sequences were approximately 2 kbp long, and the genomic structure of five exons and four introns was common in all species. All of the encoded C-type lectins were considered functional because of the presence of calcium ion-binding and sugar-binding motifs as well as conserved cysteine residues. Phylogenetic analysis of the genus indicated that the C-type lectins in freshwater eels might be divided into two clusters, corresponding to their temperate and tropical growth habitats, suggesting that Anguilla species C-type lectin has evolved to adapt to microflora in each environment. This study is the first to comprehensively describe the immune-related genes in a complete fish genus.
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Nucleotide sequence data will be available in the DDBJ/EMBL/GenBank databases under the accession numbers LC049084–LC049102.
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Tsutsui, S., Yoshinaga, T., Watanabe, S. et al. Skin mucus C-type lectin genes from all 19 Anguilla species/subspecies. Fish Sci 81, 1043–1051 (2015). https://doi.org/10.1007/s12562-015-0922-3
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DOI: https://doi.org/10.1007/s12562-015-0922-3