TY  - JOUR
A1  - Zdziarski, Jaroslaw
A1  - Brzuszkiewicz, Elzbieta
A1  - Wullt, Bjorn
A1  - Liesegang, Heiko
A1  - Biran, Dvora
A1  - Voigt, Birgit
A1  - Gronberg-Hernandez, Jenny
A1  - Ragnarsdottir, Bryndis
A1  - Hecker, Michael
A1  - Ron, Eliora Z.
A1  - Daniel, Rolf
A1  - Gottschalk, Gerhard
A1  - Hacker, Joerg
A1  - Svanborg, Catharina
A1  - Dobrindt, Ulrich
T1  - Host Imprints on Bacterial Genomes-Rapid, Divergent Evolution in Individual Patients
N2  - Bacteria lose or gain genetic material and through selection, new variants become fixed in the population. Here we provide the first, genome-wide example of a single bacterial strain’s evolution in different deliberately colonized patients and the surprising insight that hosts appear to personalize their microflora. By first obtaining the complete genome sequence of the prototype asymptomatic bacteriuria strain E. coli 83972 and then resequencing its descendants after therapeutic bladder colonization of different patients, we identified 34 mutations, which affected metabolic and virulence-related genes. Further transcriptome and proteome analysis proved that these genome changes altered bacterial gene expression resulting in unique adaptation patterns in each patient. Our results provide evidence that, in addition to stochastic events, adaptive bacterial evolution is driven by individual host environments. Ongoing loss of gene function supports the hypothesis that evolution towards commensalism rather than virulence is favored during asymptomatic bladder colonization.
KW  - Proteomanalyse
KW  - Bakterien
Y1  - 2010
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-68594
ER  - 
TY  - THES
A1  - Angermeier, Hilde Gabriele
T1  - Molecular and ecological investigations of Caribbean sponge diseases
T1  - Molekulare und ökologische Untersuchungen zu Krankheiten Karibischer Meeresschwämme
N2  - Während gewinnbringende Assoziationen von Schwämmen mit Mikroorganismen in den letzten Jahren viel Aufmerksamkeit erhalten haben, wurde weit weniger in die Interaktion von Schwämmen mit möglicherweise pathogenen Mikroben investiert. Somit war es das Ziel dieser Studie zwei ausgewählte Karibische Schwammkrankheiten namens „Sponge Orange Band“ und „Sponge White Patch“ mittels ökologischer und molekularer Methoden zu untersuchen. Die Sponge Orange Band (SOB) Erkrankung befällt den bedeutenden karibischen Fass-Schwamm Xestospongia muta, der zu den bakterienhaltigen (HMA) Schwämmen gezählt wird, während die Sponge White Patch (SWP) Erkrankung den häufig vorkommenden Seil-Schwamm Amphimedon compressa betrifft, der zu den bakterienarmen (LMA) Schwämmen gehört. Für beide Karibischen Schwammkrankheiten konnte ich einen Krankheitsverlauf beschreiben, der mit massiver Gewebszerstörung und dem Verlust charakteristischer mikrobieller Signaturen einhergeht. Obwohl ich zeigen konnte, dass zusätzliche Bakterienarten die gebleichten Schwammbereiche kolonisieren, lieferten meine Infektionsversuche in beiden Fällen keinen Beweis für die Beteiligung eines mikrobiellen Pathogens als Krankheitserreger. Somit liegen die eigentlichen Auslöser der Erkrankungen Sponge Orange Band als auch Sponge White Patch noch immer im Dunkeln.
N2  - While beneficial sponge-microbe associations have received much attention in recent years, less effort has been undertaken to investigate the interactions of sponges with potentially pathogenic microorganisms. Thus, the aim of this study was to examine two selected Caribbean disease conditions, termed “Sponge Orange Band” and “Sponge White Patch”, via ecological and molecular methods. Sponge Orange Band (SOB) disease affects the prominent Caribbean barrel sponge Xestospongia muta that is counted among the high-microbial-abundance (HMA) sponges, whereas Sponge White Patch (SWP) disease affects the abundant rope sponge Amphimedon compressa that belongs to the low-microbial-abundance (LMA) sponges. I have documented for both Caribbean sponge diseases a disease progression going along with massive tissue destruction as well as loss of the characteristic microbial signatures. Even though new bacteria were shown to colonize the bleached areas, the infection trials revealed in both cases no indication for the involvement of a microbial pathogen as an etiologic agent of disease leaving us still in the dark about the cause of Sponge Orange Band as well as Sponge White Patch disease.
KW  - Meeresschwämme
KW  - Pathogene Bakterien
KW  - Porifera
KW  - Schwamm
KW  - Bakterien
KW  - Cyanobakterien
KW  - Pathologie
KW  - Mikroskopie
KW  - Denaturierende Gradienten-Gelelektrophorese
KW  - Symbiose
KW  - Sponge diseases
KW  - Porifera
KW  - Bacteria
KW  - Cyanobacteria
KW  - Pathogens
KW  - Symbionts
KW  - Pathology
KW  - Microscopy
KW  - Denaturing Gradient Gel Electrophoresis
Y1  - 2011
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-56855
N1  - weitere Originalveröffentlichungen:
Angermeier H, Glöckner V, Pawlik JR, Lindquist NL & Hentschel U (2012).
Sponge white patch disease affecting the Caribbean sponge Amphimedon
compressa. Diseases of Aquatic Organisms 99 (2): 95-102.
ER  -