Thiotrophic bacterial symbiont induces polyphenism in giant ciliate host Zoothamnium niveum

  title={Thiotrophic bacterial symbiont induces polyphenism in giant ciliate host Zoothamnium niveum},
  author={Monika Bright and Salvador Espada-Hinojosa and Jean-Marie Volland and Judith Drexel and Julie R Kesting and Ingrid Kolar and Denny Morchner and Andrea D. Nussbaumer and J{\"o}rg A. Ott and Florian Scharhauser and Lukas Schuster and Helena Constance Zambalos and Hans L. Nemeschkal},
  journal={Scientific Reports},
Evolutionary theory predicts potential shifts between cooperative and uncooperative behaviour under fluctuating environmental conditions. This leads to unstable benefits to the partners and restricts the evolution of dependence. High dependence is usually found in those hosts in which vertically transmitted symbionts provide nutrients reliably. Here we study host dependence in the marine, giant colonial ciliate Zoothamnium niveum and its vertically transmitted, nutritional, thiotrophic symbiont… 
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Host-symbiont stress response to lack-of-sulfide in the giant ciliate mutualism
The mutualism between the thioautotrophic bacterial ectosymbiont Candidatus Thiobius zoothamnicola and the giant ciliate Zoothamnium niveum thrives in a variety of shallow-water marine environments
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Genes underlying the host–symbiont interface are predicted to follow a coevolutionary arms race, as observed for genes governing host–pathogen interactions, which is predicted to accelerate host speciation rates by generating genetic incompatibilities.
The effects of sulphide on growth and behaviour of the thiotrophic Zoothamnium niveum symbiosis
It is revealed that the symbiosis was not able to survive without sulphide and was harmed by high sulphide conditions, the first successful cultivation of a thiotrophic ectosymbiosis.
More than the “Killer Trait”: Infection with the Bacterial Endosymbiont Caedibacter taeniospiralis Causes Transcriptomic Modulation in Paramecium Host
Transcriptomics shows gene expression modulation of a ciliate caused by its bacterial endosymbiont thus revealing new adaptive advantages of the symbiosis, and Caedibacter taeniospiralis apparently increases its host fitness via manipulation of metabolic pathways and cell cycle control.
The evolution of host-symbiont dependence
Both transmission mode and symbiont function are correlated with host dependence, with reductions in host fitness being greatest when nutrient-provisioning, vertically transmitted symbionts are removed and results suggest that both function and population structure are important in driving irreversible dependence between hosts and symbions.
Specificity in diversity: single origin of a widespread ciliate-bacteria symbiosis
This study characterized the symbioses between mouthless marine ciliates of the genus Kentrophoros, and their thiotrophic bacteria, using comparative sequence analysis and fluorescence in situ hybridization.
Parallel genome reduction in symbionts descended from closely related free-living bacteria
Multiple strains of the bacterium Polynucleobacter are described that evolved independently and under similar conditions from closely related, free-living ancestors to become obligate endosymbionts of closely related ciliate hosts, and it is found that gene loss is contingently lineage-specific, with no evidence for ordered streamlining.
Betaproteobacterial symbionts of the ciliate Euplotes: origin and tangled evolutionary path of an obligate microbial association.
P phylogenetic analyses performed on an increased number of strains here presented suggest that Euplotes species, during their evolution, recruited Polynucleobacter bacteria as symbionts more than once.