Abstract
The nematode Caenorhabditis elegans is an invaluable host model for studying infections caused by various pathogens, including microsporidia. Microsporidia represent the first natural pathogens identified in C. elegans, revealing the previously unknown Nematocida genus of microsporidia. Following this discovery, the utilization of nematodes as a model host has rapidly expanded our understanding of microsporidia biology and has provided key insights into the cell and molecular mechanisms of antimicrosporidia defenses. Here, we first review the isolation history, morphological characteristics, life cycles, tissue tropism, genetics, and host immune responses for the four most well-characterized Nematocida species that infect C. elegans. We then highlight additional examples of microsporidia that infect related terrestrial and aquatic nematodes, including parasitic nematodes. To conclude, we assess exciting potential applications of the nematode-microsporidia system while addressing the technical advances necessary to facilitate future growth in this field.
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