Single cell transcriptome profiling of the Atlantic cod immune system
Guslund, N. C.; Solbakken, M. H.; Jentoft, S.; Jakobsen, K. S.; Qiao, S.-W.
Show abstract
The Atlantic cods unusual immune system, entirely lacking the Major Histocompatibility class II pathway, has prompted intriguing questions about what mechanisms are used to combat bacterial infections and how immunological memory is generated. Here, we examine the diversity of 8,180 spleen cells and peripheral blood leukocytes by single cell RNA sequencing. Unbiased transcriptional clustering revealed eleven distinct immune cell signatures. Resolution at the single cell level enabled characterisation of the major cell subsets including the cytotoxic T cells, B cells, erythrocytes, thrombocytes, neutrophils and macrophages. Further, we describe for the first time rare cell subsets which may represent dendritic cells, natural killer-like cells and a population of cytotoxic cells expressing GATA-3. We propose putative gene markers for each cluster and describe the relative proportions of each cell type in the spleen and peripheral blood leukocytes. By single cell analysis, this study provides the most detailed molecular and cellular characterization of the immune system of the Atlantic cod so far.
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