Joan E. Strassmann
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View article: Testing the coordination hypothesis: incompatibilities in aggregative development of an experimentally evolved social amoeba
Testing the coordination hypothesis: incompatibilities in aggregative development of an experimentally evolved social amoeba Open
Multicellular organisms that form by aggregation of cells arguably do not achieve high levels of complexity. Conflict among the cells is a widely accepted explanation for this, but an alternative hypothesis is that mixing cells of differen…
View article: Novel symbionts reveal amoebae as significant hosts for environmental chlamydiae
Novel symbionts reveal amoebae as significant hosts for environmental chlamydiae Open
Chlamydiae represent a diverse group of obligate intracellular bacteria with elusive hosts in environmental settings. This study used one of the largest collections of wild amoebae (Dictyostelium discoideum and D. giganteum, 106 clones) co…
View article: A generalist microbial predator shows innate attraction to more profitable prey, but does not learn from experience
A generalist microbial predator shows innate attraction to more profitable prey, but does not learn from experience Open
Generalist predators often live in environments that vary in the type and abundance of prey species. The prey species in turn vary in their susceptibility and suitability to predation. How do generalists navigate this variation in prey abu…
View article: The genetic basis of predation resistance in<i>Pseudomonas</i>species associated with the bactivorous soil amoeba<i>Dictyostelium discoideum</i>
The genetic basis of predation resistance in<i>Pseudomonas</i>species associated with the bactivorous soil amoeba<i>Dictyostelium discoideum</i> Open
Predation is likely to influence the function of bacterial communities and the evolution of bacterial pathogens, because characteristics that permit escape from predators often overlap with traits used for biocontrol of plant pathogens, vi…
View article: Complex third-party effects in the<i>Dictyostelium–Paraburkholderia</i>symbiosis: prey bacteria that are eaten, carried or left behind
Complex third-party effects in the<i>Dictyostelium–Paraburkholderia</i>symbiosis: prey bacteria that are eaten, carried or left behind Open
Symbiotic interactions may change depending on third parties like predators or prey. Third-party interactions with prey bacteria are central to the symbiosis between Dictyostelium discoideum social amoeba hosts and Paraburkholderia bacteri…
View article: Unpredictable soil conditions can affect the prevalence of a microbial symbiosis
Unpredictable soil conditions can affect the prevalence of a microbial symbiosis Open
The evolution of symbiotic interactions may be affected by unpredictable conditions. However, a link between prevalence of these conditions and symbiosis has not been widely demonstrated. We test for these associations using Dictyostelium …
View article: Testing the coordination hypothesis: incompatibilities in the absence of a single-cell bottleneck in an experimentally evolved social amoeba.
Testing the coordination hypothesis: incompatibilities in the absence of a single-cell bottleneck in an experimentally evolved social amoeba. Open
Multicellular organisms that form by aggregation of cells arguably do not achieve high levels of complexity. Conflict among the cells is a widely accepted explanation for this, but an alternative hypothesis is that mixing cells of differen…
View article: In the social amoeba <i>Dictyostelium discoideum</i>, shortened stalks may limit obligate cheater success even when exploitable partners are available
In the social amoeba <i>Dictyostelium discoideum</i>, shortened stalks may limit obligate cheater success even when exploitable partners are available Open
Cooperation is widespread across life, but its existence can be threatened by exploitation. The rise of obligate social cheaters that are incapable of contributing to a necessary cooperative function can lead to the loss of that function. …
View article: Costs of being a diet generalist for the protist predator <i>Dictyostelium discoideum</i>
Costs of being a diet generalist for the protist predator <i>Dictyostelium discoideum</i> Open
Consumers range from specialists that feed on few resources to generalists that feed on many. Generalism has the clear advantage of having more resources to exploit, but the costs that limit generalism are less clear. We explore two unders…
View article: Reduced social function in experimentally evolved <i>Dictyostelium discoideum</i> implies selection for social conflict in nature
Reduced social function in experimentally evolved <i>Dictyostelium discoideum</i> implies selection for social conflict in nature Open
Many microbes interact with one another, but the difficulty of directly observing these interactions in nature makes interpreting their adaptive value complicated. The social amoeba Dictyostelium discoideum forms aggregates wherein some ce…
View article: Predation-resistant <i>Pseudomonas</i> bacteria engage in symbiont-like behavior with the social amoeba <i>Dictyostelium discoideum</i>
Predation-resistant <i>Pseudomonas</i> bacteria engage in symbiont-like behavior with the social amoeba <i>Dictyostelium discoideum</i> Open
The soil amoeba Dictyostelium discoideum acts as both a predator and potential host for diverse bacteria. We tested fifteen Pseudomonas strains that were isolated from transiently infected wild D. discoideum for ability to escape predation…
View article: Parallel evolution of the G protein-coupled receptor GrlG and the loss of fruiting body formation in the social amoeba <i>Dictyostelium discoideum</i> evolved under low relatedness
Parallel evolution of the G protein-coupled receptor GrlG and the loss of fruiting body formation in the social amoeba <i>Dictyostelium discoideum</i> evolved under low relatedness Open
Aggregative multicellularity relies on cooperation among formerly independent cells to form a multicellular body. Previous work with Dictyostelium discoideum showed that experimental evolution under low relatedness profoundly decreased coo…
View article: Predation-resistant<i>Pseudomonas</i>bacteria engage in symbiont-like behavior with the social amoeba<i>Dictyostelium discoideum</i>
Predation-resistant<i>Pseudomonas</i>bacteria engage in symbiont-like behavior with the social amoeba<i>Dictyostelium discoideum</i> Open
The soil amoeba Dictyostelium discoideum acts as both a predator and potential host for diverse bacteria. We tested fifteen Pseudomonas strains that were isolated from transiently infected wild D. discoideum for ability to escape predation…
View article: Experimental evolution of symbiotic microbes without their partners can imply the presence of cooperative or antagonistic adaptations
Experimental evolution of symbiotic microbes without their partners can imply the presence of cooperative or antagonistic adaptations Open
Microbes adapt to the presence of other species, but the fitness consequences of specific interactions are difficult to study in their natural context. We experimentally evolved symbiotic microbes in an artificial environment without acces…
View article: In the social amoeba<i>D. discoideum</i>, shortened stalks limit obligate cheater success even when exploitable partners are available
In the social amoeba<i>D. discoideum</i>, shortened stalks limit obligate cheater success even when exploitable partners are available Open
Cooperation is widespread across life, but its existence can be threatened by exploitation. The rise of obligate social cheaters that are incapable of contributing to a necessary cooperative function can lead to the loss of that function a…
View article: Reduced social function in experimentally evolved<i>Dictyostelium discoideum</i>implies selection for social conflict in nature
Reduced social function in experimentally evolved<i>Dictyostelium discoideum</i>implies selection for social conflict in nature Open
Many microbes interact with one another, but the difficulty of directly observing these interactions in nature makes interpreting their adaptive value complicated. The social amoeba Dictyostelium discoideum forms aggregates wherein some ce…
View article: Resource-combining costs of being a diet generalist in the super-generalist protist predator<i>Dictyostelium discoideum</i>
Resource-combining costs of being a diet generalist in the super-generalist protist predator<i>Dictyostelium discoideum</i> Open
Consumers lie on a continuum between diet specialization on few resources to being generalist feeders on many resources. Generalism has the clear advantage of having more resources to exploit, but the costs that limit generalism are less c…
View article: Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba
Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba Open
Some endosymbionts living within a host must modulate their hosts' immune systems in order to infect and persist. We studied the effect of a bacterial endosymbiont on a facultatively multicellular social amoeba host. Aggregates of the amoe…
View article: <i>Paraburkholderia</i> symbionts isolated from <i>Dictyostelium discoideum</i> induce bacterial carriage in other <i>Dictyostelium</i> species
<i>Paraburkholderia</i> symbionts isolated from <i>Dictyostelium discoideum</i> induce bacterial carriage in other <i>Dictyostelium</i> species Open
The social amoeba Dictyostelium discoideum engages in a complex relationship with bacterial endosymbionts in the genus Paraburkholderia , which can benefit their host by imbuing it with the ability to carry prey bacteria throughout its lif…
View article: Unpredictable soil conditions affect the prevalence of a microbial symbiosis
Unpredictable soil conditions affect the prevalence of a microbial symbiosis Open
The evolution of symbiotic interactions may be affected by unpredictable conditions. However, a link between prevalence of symbiosis and these conditions has not been widely demonstrated. We test for these associations using Dictyostelium …
View article: Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba
Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba Open
Some endosymbionts living within a host must modulate their hosts’ immune systems in order to infect and persist. We studied the effect of a bacterial endosymbiont on a facultatively multicellular social amoeba host. Aggregates of the amoe…
View article: The social amoeba <i>Dictyostelium discoideum</i> rescues <i>Paraburkholderia hayleyella</i>, but not <i>P. agricolaris</i>, from interspecific competition
The social amoeba <i>Dictyostelium discoideum</i> rescues <i>Paraburkholderia hayleyella</i>, but not <i>P. agricolaris</i>, from interspecific competition Open
Bacterial endosymbionts can provide benefits for their eukaryotic hosts, but it is often unclear if endosymbionts benefit from these relationships. The social amoeba Dictyostelium discoideum associates with three species of Paraburkholderi…
View article: Limits to the spread of an obligate social cheater in the social amoeba<i>Dictyostelium discoideum</i>
Limits to the spread of an obligate social cheater in the social amoeba<i>Dictyostelium discoideum</i> Open
Cooperation is widespread across life, but its existence can be threatened by exploitation. Social cheaters can be obligate, incapable of contributing to a necessary function, so that spread of the cheater leads to loss of the function. In…
View article: Beads_Data.txt from Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba
Beads_Data.txt from Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba Open
Some endosymbionts living within a host must modulate their hosts' immune systems in order to infect and persist. We studied the effect of a bacterial endosymbiont on a facultatively multicellular social amoeba host. Aggregates of the amoe…
View article: EtBr data for log2Fold change graph.xlsx from Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba
EtBr data for log2Fold change graph.xlsx from Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba Open
Some endosymbionts living within a host must modulate their hosts' immune systems in order to infect and persist. We studied the effect of a bacterial endosymbiont on a facultatively multicellular social amoeba host. Aggregates of the amoe…
View article: SScell2_total_spore_combined.csv from Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba
SScell2_total_spore_combined.csv from Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba Open
Some endosymbionts living within a host must modulate their hosts' immune systems in order to infect and persist. We studied the effect of a bacterial endosymbiont on a facultatively multicellular social amoeba host. Aggregates of the amoe…
View article: Analysis.R from Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba
Analysis.R from Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba Open
Some endosymbionts living within a host must modulate their hosts' immune systems in order to infect and persist. We studied the effect of a bacterial endosymbiont on a facultatively multicellular social amoeba host. Aggregates of the amoe…
View article: CureFarmerData.txt from Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba
CureFarmerData.txt from Symbiotic bacteria, immune-like sentinel cells, and the response to pathogens in a social amoeba Open
Some endosymbionts living within a host must modulate their hosts' immune systems in order to infect and persist. We studied the effect of a bacterial endosymbiont on a facultatively multicellular social amoeba host. Aggregates of the amoe…