In-vitro cultivation of Nosema bombycis sporoplasms: A method for potential genetic engineering of microsporidia.

Microsporidia are obligate intracellular parasites and cannot be cultured in vitro, which limits the use of current genetic engineering technologies on this pathogen. We isolated sporoplasms of Nosema bombycis to attempt to culture the pathogen in vitro. Cell-free medium was designed and successfully maintained the sporoplasms for 5 days. The sporoplasms were able to absorb ATP from the medium and DNA replicated during cultivation, although there was not a significant change in morphology and number of sporoplasms. Our study provides a strategy for in vitro cultivation and genetic manipulation of microsporidia. .