Abstract
Paramecium spp. may be a host for about 60 species of different bacteria, among of them ten Holospora spp. are investigated further. They are infectious alphaproteobacteria, and populate the nuclear apparatus of six ciliates of the genus. The complex life cycle of Holospora bacteria and their host and nuclear specificity suggest that there is a system of diverse interactions with the host both at the stage of infection and during infection maintenance in the nuclei. Holospora is a very good experimental subject for widely directed investigations in the fields of protistology, symbiontology, parasitology, and cell biology. The considerable number of Holospora spp. known to date, the possibility of laboratory infection of aposymbiotic paramecia, and the possibility of experimental modeling of combinations (in which endobionts and hosts possess different morphological and genetic features) make this symbiotic system very convenient for the study of several important problems – especially in experimental cell biology such as intracellular signaling and the development of intracellular communication. Biodiversity, the main morphological and biological features of the bacteria, as well as the ecological significance and phylogenetical position are discussed according to the respective extensive studies of the authors. Historical steps of Holospora investigations are reconstructed for the first time.
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Fokin, S.I., Görtz, HD. (2009). Diversity of Holospora Bacteria in Paramecium and Their Characterization. In: Fujishima, M. (eds) Endosymbionts in Paramecium. Microbiology Monographs, vol 12. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-92677-1_7
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