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Endosymbiosis in Paramecium

Team leader: 
Martina Schrallhammer
Team members: 
Martina Schrallhammer
Chiara Bella
Kenia Sague
Institute or University: 
Microbiology, University of Freiburg
Schänzlestr. 1
Microbiology, Biological Institute II, University of Freiburg
Research interests: 

Endosymbiosis between bacteria and aquatic ciliates, especially Paramecium

  • Microbial diversity
  • Function and role of endosymbionts
  • Epigenetic effects of bacterial infection on Paramecium
Paramecium, endosymbiosis, parasite, infection, epigenetic influence
fluorescence microscopy
transmission electron microscopy
molecular biology

Dusi E., Krenek S., Schrallhammer M., Sachse R., Rauch G., Kaltz O. & Berendonk T.U. (2014). Vertically transmitted symbiont reduces host fitness along temperature gradient.Journal of Evolutionary Biology 27: 196-800Boscaro V., Schrallhammer M., Benken K. A., Krenek S., Szokoli F., Berendonk T. U., Schweikert M., Verni F., Sabaneyeva E. V. & Petroni G. (2013). Rediscovering the genus Lyticum, multiflagellated symbionts of the order Rickettsiales.Scientific Reports 3:3305 doi: 10.1038/srep03305Schrallhammer M., Ferrantini F., Vannini C., Galati S., Schweikert M., Görtz H.D., Verni F. & Petroni G (2013). 'Candidatus Megaira polyxenophila' gen. nov., sp. nov.: considerations on evolutionary history, host range and shift of early divergent Rickettsiae.PLoS ONE 8(8): e72581. doi:10.1371/journal.pone.0072581Boscaro V., Fokin S.I., Schrallhammer M., Schweikert M. & Petroni G. (2013) Revised systematics of Holospora-like bacteria and characterization of "Candidatus Gortzia infectiva", a novel macronuclear symbiont of Paramecium jenningsi.Microbial Ecology 65(1): 255-267Schrallhammer M., Galati S., Altenbuchner J., Schweikert M., Görtz, H.D. & Petroni G. (2012). Tracing the role of R-bodies in the killer trait: absence of toxicity of R-body producing recombinant E. coli on paramecia.European Journal of Protistology 48(4): 290–296Schrallhammer M., Schweikert M., Vallesi A., Verni F. & Petroni G. (2011). Detection of a novel subspecies of Francisella noatunensis as endosymbiont of the ciliate Euplotes raikovi.Microbial Ecology 61(2): 455-64, DOI: 10.1007/s00248-010-9772-9Schrallhammer M. (2010). The killer trait of Paramecium and its causative agents.Paleodiversity 3, Supplement: 79–88Pilhofer M., Bauer A.P., Schrallhammer M., Richter L., Ludwig W., Schleifer K.H. & Petroni G. (2007). Characterization of bacterial operons consisting of two tubulins and a kinesin-like gene by the novel Two-Step Gene Walking method.Nucleic Acids Research 35(20): e135 PMCID: PMC2175320; doi: 10.1093/nar/gkm836Vannini C., Pöckl M., Petroni G., Wu Q.L., Lang E., Stackebrandt E., Schrallhammer M., Richardson P.M. & Hahn M.W. (2007). Endosymbiosis in statu nascendi: close phylogenetic relationship between obligately endosymbiotic and obligately free-living Polynucleobacter strains (Betaproteobacteria).Environmental Microbiology 9(2): 347-359Schrallhammer M., Fokin S.I., Schleifer K.H. &Petroni G. (2006). Molecular characterization of the obligate endosymbiont "Caedibacter macronucleorum" Fokin and Görtz 1993 and of its host Paramecium duboscqui strain Ku4-8.Journal of Eukaryotic Microbiology 53(6): 499-506

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