Transplantation of Killer Endosymbionts in Paramecium

Gıbson, Ian

doi:10.1038/241127a0

Cited by 19 publications

(4 citation statements)

References 8 publications

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“…Gibson (37) also has made the remarkable observation that when mu-bearing 138 (syngen 8) paramecia are injected with lambda-bearing cytoplasm from 299 (syngen 8), both endosymbionts disappear. Also surprising are three cases where only the injected endosymbionts persisted, the originals disappearing: paramecia bearing 138 mu (syngen 8) injected with cytoplasm containing 7 kappa (syngen 2), stock 299 lambda bearers (syngen 8) injected with cytoplasm containing 7 kappa, and stock 299 lambda bearers injected with cytoplasm containing Al kappa.…”

Section: Mixed Populationsmentioning

confidence: 99%

Kappa and other endosymbionts in Paramecium aurelia.

Preer¹,

Preer²,

Jurand³

1974

Bacteriological Reviews

145

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Section: Mixed Populationsmentioning

confidence: 99%

Kappa and other endosymbionts in Paramecium aurelia.

Preer¹,

Preer²,

Jurand³

1974

Bacteriological Reviews

145

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“…However, many important questions remain to be clarified. For example, it is not known how obligate symbiosis is established in the first place or how sensitive strains can pick up Caedibacter and become killers, nor how killer Paramecium strains are protected from their own specific R-body producing endosymbionts (Gibson 1973; Preer et al 1974). …”

mentioning

confidence: 99%

A Genomic Survey of Reb Homologs Suggests Widespread Occurrence of R-Bodies in Proteobacteria

Raymann

Bobay

Doak

et al. 2013

G3 Genes|Genomes|Genetics

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Bacteria and eukaryotes are involved in many types of interaction in nature, with important ecological consequences. However, the diversity, occurrence, and mechanisms of these interactions often are not fully known. The obligate bacterial endosymbionts of Paramecium provide their hosts with the ability to kill sensitive Paramecium strains through the production of R-bodies, highly insoluble coiled protein ribbons. R-bodies have been observed in a number of free-living bacteria, where their function is unknown. We have performed an exhaustive survey of genes coding for homologs of Reb proteins (R-body components) in complete bacterial genomes. We found that reb genes are much more widespread than previously thought, being present in representatives of major Proteobacterial subdivisions, including many free-living taxa, as well as taxa known to be involved in various kinds of interactions with eukaryotes, from mutualistic associations to pathogenicity. Reb proteins display very good conservation at the sequence level, suggesting that they may produce functional R-bodies. Phylogenomic analysis indicates that reb genes underwent a complex evolutionary history and allowed the identification of candidates potentially involved in R-body assembly, functioning, regulation, or toxicity. Our results strongly suggest that the ability to produce R-bodies is likely widespread in Proteobacteria. The potential involvement of R-bodies in as yet unexplored interactions with eukaryotes and the consequent ecological implications are discussed.

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“…114, 115). Kappa particles cfan also be artificially introduced into paramecia by microin'jection (27,51).…”

Section: R-body-containing Paramecium Endosymbiontsmentioning

confidence: 99%