| Summary: | The innate immune system is the first line of defense in multicellular organisms. <i>Danio rerio</i> is widely considered a promising model for IIS-related research, with the most amount of scRNAseq data available among <i>Teleostei</i>. We summarized the scRNAseq and spatial transcriptomics experiments related to the IIS for zebrafish and other <i>Teleostei</i> from the GEO NCBI and the Single-Cell Expression Atlas. We found a considerable number of scRNAseq experiments at different stages of zebrafish development in organs such as the kidney, liver, stomach, heart, and brain. These datasets could be further used to conduct large-scale meta-analyses and to compare the IIS of zebrafish with the mammalian one. However, only a small number of scRNAseq datasets are available for other fish (turbot, salmon, cavefish, and dark sleeper). Since fish biology is very diverse, it would be a major mistake to use zebrafish alone in fish immunology studies. In particular, there is a special need for new scRNAseq experiments involving nonmodel <i>Teleostei</i>, e.g., long-lived species, cancer-resistant fish, and various fish ecotypes.
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