1
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Bingham A, Sur A, Shaw LB, Murphy HA. The effect of cooperator recognition on competition among clones in spatially structured microbial communities. PLoS One 2024; 19:e0299546. [PMID: 38547104 PMCID: PMC10977701 DOI: 10.1371/journal.pone.0299546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 02/12/2024] [Indexed: 04/02/2024] Open
Abstract
In spatially structured microbial communities, clonal growth of stationary cells passively generates clusters of related individuals. This can lead to stable cooperation without the need for recognition mechanisms. However, recent research suggests that some biofilm-forming microbes may have mechanisms of kin recognition. To explore this unexpected observation, we studied the effects of different types of cooperation in a microbial colony using spatially explicit, agent-based simulations of two interacting strains. We found scenarios that favor a form of kin recognition in spatially structured microbial communities. In the presence of a "cheater" strain, a strain with greenbeard cooperation was able to increase in frequency more than a strain with obligate cooperation. This effect was most noticeable in high density colonies and when the cooperators were not as abundant as the cheaters. We also studied whether a polychromatic greenbeard, in which cells only cooperate with their own type, could provide a numerical benefit beyond a simple, binary greenbeard. We found the greatest benefit to a polychromatic greenbeard when cooperation is highly effective. These results suggest that in some ecological scenarios, recognition mechanisms may be beneficial even in spatially structured communities.
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Affiliation(s)
- Adrienna Bingham
- Department of Applied Science, William & Mary, Williamsburg, VA, United States of America
| | - Aparajita Sur
- Department of Mathematics, William & Mary, Williamsburg, VA, United States of America
| | - Leah B. Shaw
- Department of Mathematics, William & Mary, Williamsburg, VA, United States of America
| | - Helen A. Murphy
- Department of Biology, William & Mary, Williamsburg, VA, United States of America
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2
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Ekdahl LI, Salcedo JA, Dungan MM, Mason DV, Myagmarsuren D, Murphy HA. Selection on plastic adherence leads to hyper-multicellular strains and incidental virulence in the budding yeast. eLife 2023; 12:e81056. [PMID: 37916911 PMCID: PMC10764007 DOI: 10.7554/elife.81056] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 11/01/2023] [Indexed: 11/03/2023] Open
Abstract
Many disease-causing microbes are not obligate pathogens; rather, they are environmental microbes taking advantage of an ecological opportunity. The existence of microbes whose life cycle does not require a host and are not normally pathogenic, yet are well-suited to host exploitation, is an evolutionary puzzle. One hypothesis posits that selection in the environment may favor traits that incidentally lead to pathogenicity and virulence, or serve as pre-adaptations for survival in a host. An example of such a trait is surface adherence. To experimentally test the idea of 'accidental virulence', replicate populations of Saccharomyces cerevisiae were evolved to attach to a plastic bead for hundreds of generations. Along with plastic adherence, two multicellular phenotypes- biofilm formation and flor formation- increased; another phenotype, pseudohyphal growth, responded to the nutrient limitation. Thus, experimental selection led to the evolution of highly-adherent, hyper-multicellular strains. Wax moth larvae injected with evolved hyper-multicellular strains were significantly more likely to die than those injected with evolved non-multicellular strains. Hence, selection on plastic adherence incidentally led to the evolution of enhanced multicellularity and increased virulence. Our results support the idea that selection for a trait beneficial in the open environment can inadvertently generate opportunistic, 'accidental' pathogens.
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Affiliation(s)
- Luke I Ekdahl
- Department of Biology, College of William and MaryWilliamsburgUnited States
| | - Juliana A Salcedo
- Department of Biology, College of William and MaryWilliamsburgUnited States
| | - Matthew M Dungan
- Department of Biology, College of William and MaryWilliamsburgUnited States
| | - Despina V Mason
- Department of Biology, College of William and MaryWilliamsburgUnited States
| | | | - Helen A Murphy
- Department of Biology, College of William and MaryWilliamsburgUnited States
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3
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Capp J, Thomas F, Marusyk A, M. Dujon A, Tissot S, Gatenby R, Roche B, Ujvari B, DeGregori J, Brown JS, Nedelcu AM. The paradox of cooperation among selfish cancer cells. Evol Appl 2023; 16:1239-1256. [PMID: 37492150 PMCID: PMC10363833 DOI: 10.1111/eva.13571] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 05/19/2023] [Accepted: 06/06/2023] [Indexed: 07/27/2023] Open
Abstract
It is traditionally assumed that during cancer development, tumor cells abort their initially cooperative behavior (i.e., cheat) in favor of evolutionary strategies designed solely to enhance their own fitness (i.e., a "selfish" life style) at the expense of that of the multicellular organism. However, the growth and progress of solid tumors can also involve cooperation among these presumed selfish cells (which, by definition, should be noncooperative) and with stromal cells. The ultimate and proximate reasons behind this paradox are not fully understood. Here, in the light of current theories on the evolution of cooperation, we discuss the possible evolutionary mechanisms that could explain the apparent cooperative behaviors among selfish malignant cells. In addition to the most classical explanations for cooperation in cancer and in general (by-product mutualism, kin selection, direct reciprocity, indirect reciprocity, network reciprocity, group selection), we propose the idea that "greenbeard" effects are relevant to explaining some cooperative behaviors in cancer. Also, we discuss the possibility that malignant cooperative cells express or co-opt cooperative traits normally expressed by healthy cells. We provide examples where considerations of these processes could help understand tumorigenesis and metastasis and argue that this framework provides novel insights into cancer biology and potential strategies for cancer prevention and treatment.
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Affiliation(s)
- Jean‐Pascal Capp
- Toulouse Biotechnology InstituteUniversity of Toulouse, INSA, CNRS, INRAEToulouseFrance
| | - Frédéric Thomas
- CREEC, MIVEGECUniversity of Montpellier, CNRS, IRDMontpellierFrance
| | - Andriy Marusyk
- Department of Cancer PhysiologyH Lee Moffitt Cancer Center and Research InstituteTampaFloridaUSA
| | - Antoine M. Dujon
- Centre for Integrative Ecology, School of Life and Environmental SciencesDeakin UniversityGeelongVictoriaAustralia
| | - Sophie Tissot
- Department of Biochemistry and Molecular GeneticsUniversity of Colorado Anschutz Medical CampusAuroraColoradoUSA
| | - Robert Gatenby
- Department of Cancer PhysiologyH Lee Moffitt Cancer Center and Research InstituteTampaFloridaUSA
| | - Benjamin Roche
- Department of Biochemistry and Molecular GeneticsUniversity of Colorado Anschutz Medical CampusAuroraColoradoUSA
| | - Beata Ujvari
- Centre for Integrative Ecology, School of Life and Environmental SciencesDeakin UniversityGeelongVictoriaAustralia
| | - James DeGregori
- Department of Biochemistry and Molecular GeneticsUniversity of Colorado Anschutz Medical CampusAuroraColoradoUSA
| | - Joel S. Brown
- Department of Cancer PhysiologyH Lee Moffitt Cancer Center and Research InstituteTampaFloridaUSA
| | - Aurora M. Nedelcu
- Department of BiologyUniversity of New BrunswickFrederictonNew BrunswickCanada
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4
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Belpaire TER, Pešek J, Lories B, Verstrepen KJ, Steenackers HP, Ramon H, Smeets B. Permissive aggregative group formation favors coexistence between cooperators and defectors in yeast. THE ISME JOURNAL 2022; 16:2305-2312. [PMID: 35778439 PMCID: PMC9477849 DOI: 10.1038/s41396-022-01275-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 06/08/2022] [Accepted: 06/16/2022] [Indexed: 06/01/2023]
Abstract
In Saccharomyces cerevisiae, the FLO1 gene encodes flocculins that lead to formation of multicellular flocs, that offer protection to the constituent cells. Flo1p was found to preferentially bind to fellow cooperators compared to defectors lacking FLO1 expression, enriching cooperators within the flocs. Given this dual function in cooperation and kin recognition, FLO1 has been termed a "green beard gene". Because of the heterophilic nature of the Flo1p bond however, we hypothesize that kin recognition is permissive and depends on the relative stability of the FLO1+/flo1- versus FLO1+/FLO1+ detachment force F. We combine single-cell measurements of adhesion, individual cell-based simulations of cluster formation, and in vitro flocculation to study the impact of relative bond stability on the evolutionary stability of cooperation. We identify a trade-off between both aspects of the green beard mechanism, with reduced relative bond stability leading to increased kin recognition at the expense of cooperative benefits. We show that the fitness of FLO1 cooperators decreases as their frequency in the population increases, arising from the observed permissive character (F+- = 0.5 F++) of the Flo1p bond. Considering the costs associated with FLO1 expression, this asymmetric selection often results in a stable coexistence between cooperators and defectors.
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Affiliation(s)
- Tom E R Belpaire
- Division of Mechatronics, Biostatistics, and Sensors, KU Leuven, 3001, Leuven, Belgium.
- Centre for Microbial and Plant Genetics, KU Leuven, 3001, Leuven, Belgium.
| | - Jiří Pešek
- Team SIMBIOTX, Inria Saclay, 91120, Palaiseau, France
| | - Bram Lories
- Centre for Microbial and Plant Genetics, KU Leuven, 3001, Leuven, Belgium
| | - Kevin J Verstrepen
- Centre for Microbial and Plant Genetics, KU Leuven, 3001, Leuven, Belgium
- Laboratory of Systems Biology, VIB-KU Leuven Center for Microbiology, 3001, Leuven, Belgium
| | - Hans P Steenackers
- Centre for Microbial and Plant Genetics, KU Leuven, 3001, Leuven, Belgium
| | - Herman Ramon
- Division of Mechatronics, Biostatistics, and Sensors, KU Leuven, 3001, Leuven, Belgium
| | - Bart Smeets
- Division of Mechatronics, Biostatistics, and Sensors, KU Leuven, 3001, Leuven, Belgium
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5
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Kim H, Skinner DJ, Glass DS, Hamby AE, Stuart BAR, Dunkel J, Riedel-Kruse IH. 4-bit adhesion logic enables universal multicellular interface patterning. Nature 2022; 608:324-329. [PMID: 35948712 PMCID: PMC9365691 DOI: 10.1038/s41586-022-04944-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Accepted: 06/07/2022] [Indexed: 01/01/2023]
Abstract
Multicellular systems, from bacterial biofilms to human organs, form interfaces (or boundaries) between different cell collectives to spatially organize versatile functions1,2. The evolution of sufficiently descriptive genetic toolkits probably triggered the explosion of complex multicellular life and patterning3,4. Synthetic biology aims to engineer multicellular systems for practical applications and to serve as a build-to-understand methodology for natural systems5–8. However, our ability to engineer multicellular interface patterns2,9 is still very limited, as synthetic cell–cell adhesion toolkits and suitable patterning algorithms are underdeveloped5,7,10–13. Here we introduce a synthetic cell–cell adhesin logic with swarming bacteria and establish the precise engineering, predictive modelling and algorithmic programming of multicellular interface patterns. We demonstrate interface generation through a swarming adhesion mechanism, quantitative control over interface geometry and adhesion-mediated analogues of developmental organizers and morphogen fields. Using tiling and four-colour-mapping concepts, we identify algorithms for creating universal target patterns. This synthetic 4-bit adhesion logic advances practical applications such as human-readable molecular diagnostics, spatial fluid control on biological surfaces and programmable self-growing materials5–8,14. Notably, a minimal set of just four adhesins represents 4 bits of information that suffice to program universal tessellation patterns, implying a low critical threshold for the evolution and engineering of complex multicellular systems3,5. A synthetic cell-cell adhesion logic using swarming E. coli with 4 bits of information is introduced, enabling the programming of interfaces that combine to form universal tessellation patterns over a large scale.
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Affiliation(s)
- Honesty Kim
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ, USA
| | - Dominic J Skinner
- Department of Mathematics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - David S Glass
- Department of Molecular Cell Biology, Weizmann Institute of Science, Rehovot, Israel
| | - Alexander E Hamby
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ, USA
| | - Bradey A R Stuart
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ, USA
| | - Jörn Dunkel
- Department of Mathematics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Ingmar H Riedel-Kruse
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ, USA. .,Department of Applied Mathematics, University of Arizona, Tucson, AZ, USA. .,Department of Biomedical Engineering, University of Arizona, Tucson, AZ, USA.
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6
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Capp JP, Thomas F. From developmental to atavistic bet-hedging: How cancer cells pervert the exploitation of random single-cell phenotypic fluctuations. Bioessays 2022; 44:e2200048. [PMID: 35839471 DOI: 10.1002/bies.202200048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 07/05/2022] [Accepted: 07/05/2022] [Indexed: 11/08/2022]
Abstract
Stochastic gene expression plays a leading developmental role through its contribution to cell differentiation. It is also proposed to promote phenotypic diversification in malignant cells. However, it remains unclear if these two forms of cellular bet-hedging are identical or rather display distinct features. Here we argue that bet-hedging phenomena in cancer cells are more similar to those occurring in unicellular organisms than to those of normal metazoan cells. We further propose that the atavistic bet-hedging strategies in cancer originate from a hijacking of the normal developmental bet-hedging of metazoans. Finally, we discuss the constraints that may shape the atavistic bet-hedging strategies of cancer cells.
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Affiliation(s)
- Jean-Pascal Capp
- Toulouse Biotechnology Institute, INSA / University of Toulouse, CNRS, INRAE, Toulouse, France
| | - Frédéric Thomas
- CREEC, UMR IRD 224-CNRS 5290-University of Montpellier, Montpellier, France
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7
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Day TC, Márquez-Zacarías P, Bravo P, Pokhrel AR, MacGillivray KA, Ratcliff WC, Yunker PJ. Varied solutions to multicellularity: The biophysical and evolutionary consequences of diverse intercellular bonds. BIOPHYSICS REVIEWS 2022; 3:021305. [PMID: 35673523 PMCID: PMC9164275 DOI: 10.1063/5.0080845] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Accepted: 04/29/2022] [Indexed: 11/16/2022]
Abstract
The diversity of multicellular organisms is, in large part, due to the fact that multicellularity has independently evolved many times. Nonetheless, multicellular organisms all share a universal biophysical trait: cells are attached to each other. All mechanisms of cellular attachment belong to one of two broad classes; intercellular bonds are either reformable or they are not. Both classes of multicellular assembly are common in nature, having independently evolved dozens of times. In this review, we detail these varied mechanisms as they exist in multicellular organisms. We also discuss the evolutionary implications of different intercellular attachment mechanisms on nascent multicellular organisms. The type of intercellular bond present during early steps in the transition to multicellularity constrains future evolutionary and biophysical dynamics for the lineage, affecting the origin of multicellular life cycles, cell-cell communication, cellular differentiation, and multicellular morphogenesis. The types of intercellular bonds used by multicellular organisms may thus result in some of the most impactful historical constraints on the evolution of multicellularity.
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Affiliation(s)
- Thomas C. Day
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | | | | | - Aawaz R. Pokhrel
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | | | - William C. Ratcliff
- School of Biological Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
| | - Peter J. Yunker
- School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
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8
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Forehand AL, Myagmarsuren D, Chen Z, Murphy HA. Variation in pH gradients and FLO11 expression in mat biofilms from environmental isolates of the yeast Saccharomyces cerevisiae. Microbiologyopen 2022; 11:e1277. [PMID: 35478280 PMCID: PMC9059236 DOI: 10.1002/mbo3.1277] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Accepted: 03/10/2022] [Indexed: 12/15/2022] Open
Abstract
Saccharomyces cerevisiae produces a multicellular phenotype, known as a mat, on a semi-solid medium. This biofilm phenotype was first described in the lab strain Σ1278b and has been analyzed mostly in this same background. Yeast cells form a mat by spreading across the medium and adhering to each other and the surface, in part through the variegated expression of the cell adhesion, FLO11. This process creates a characteristic floral pattern and generates pH and glucose gradients outward from the center of the mat. Mats are encapsulated in a liquid which may aid in surface spreading and diffusion. Here, we examine thirteen environmental isolates that vary visually in the phenotype. We predicted that mat properties were universal and increased morphological complexity would be associated with more extreme trait values. Our results showed that pH varied significantly among strains, but was not correlated to mat complexity. Only two isolates generated significant liquid boundaries and neither produced visually complex mats. In five isolates, we tracked the initiation of FLO11 using green fluorescent protein (GFP) under the control of the endogenous promoter. Strains varied in when and how much GFP was detected, with increased signal associated with increased morphological complexity. Generally, the signal was strongest in the center of the mat and absent at the expanding edge. Our results show that traits discovered in one background vary and exist independently of mat complexity in natural isolates. The environment may favor different sets of traits, which could have implications for how this yeast adapts to its many ecological niches.
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Affiliation(s)
- Amy L. Forehand
- Department of BiologyWilliam & MaryWilliamsburgVirginiaUSA,Present address:
Amy L. Forehand, Department of BiologyUniversity of VirginiaCharlottesvilleVirginiaUSA
| | | | - Ziyan Chen
- Department of BiologyWilliam & MaryWilliamsburgVirginiaUSA,Present address:
Ziyan Chen, School of MedicineUniversity of VirginiaCharlottesvilleVirginiaUSA
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9
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Brückner S, Schubert R, Kraushaar T, Hartmann R, Hoffmann D, Jelli E, Drescher K, Müller DJ, Oliver Essen L, Mösch HU. Kin discrimination in social yeast is mediated by cell surface receptors of the Flo11 adhesin family. eLife 2020; 9:55587. [PMID: 32286952 PMCID: PMC7156268 DOI: 10.7554/elife.55587] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 04/03/2020] [Indexed: 02/06/2023] Open
Abstract
Microorganisms have evolved specific cell surface molecules that enable discrimination between cells from the same and from a different kind. Here, we investigate the role of Flo11-type cell surface adhesins from social yeasts in kin discrimination. We measure the adhesion forces mediated by Flo11A-type domains using single-cell force spectroscopy, quantify Flo11A-based cell aggregation in populations and determine the Flo11A-dependent segregation of competing yeast strains in biofilms. We find that Flo11A domains from diverse yeast species confer remarkably strong adhesion forces by establishing homotypic interactions between single cells, leading to efficient cell aggregation and biofilm formation in homogenous populations. Heterotypic interactions between Flo11A domains from different yeast species or Saccharomyces cerevisiae strains confer weak adhesive forces and lead to efficient strain segregation in heterogenous populations, indicating that in social yeasts Flo11A-mediated cell adhesion is a major mechanism for kin discrimination at species and sub-species levels. These findings, together with our structure and mutation analysis of selected Flo11A domains, provide a rationale of how cell surface receptors have evolved in microorganisms to mediate kin discrimination.
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Affiliation(s)
- Stefan Brückner
- Department of Genetics, Philipps-Universität Marburg, Marburg, Germany
| | - Rajib Schubert
- Department of Biosystems Science and Engineering, ETH Zürich, Basel, Switzerland
| | - Timo Kraushaar
- Department of Biochemistry, Philipps-Universität Marburg, Marburg, Germany
| | - Raimo Hartmann
- Max Planck Institute for Terrestrial Microbiology, Marburg, Germany
| | - Daniel Hoffmann
- Department of Genetics, Philipps-Universität Marburg, Marburg, Germany
| | - Eric Jelli
- Max Planck Institute for Terrestrial Microbiology, Marburg, Germany
| | - Knut Drescher
- Max Planck Institute for Terrestrial Microbiology, Marburg, Germany
| | - Daniel J Müller
- Department of Biosystems Science and Engineering, ETH Zürich, Basel, Switzerland
| | - Lars Oliver Essen
- Department of Biochemistry, Philipps-Universität Marburg, Marburg, Germany.,LOEWE Center for Synthetic Microbiology, Philipps-Universität Marburg, Marburg, Germany
| | - Hans-Ulrich Mösch
- Department of Genetics, Philipps-Universität Marburg, Marburg, Germany.,LOEWE Center for Synthetic Microbiology, Philipps-Universität Marburg, Marburg, Germany
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Oppler ZJ, Parrish ME, Murphy HA. Variation at an adhesin locus suggests sociality in natural populations of the yeast Saccharomyces cerevisiae. Proc Biol Sci 2019; 286:20191948. [PMID: 31615361 PMCID: PMC6834051 DOI: 10.1098/rspb.2019.1948] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Microbes engage in numerous social behaviours that are critical for survival and reproduction, and that require individuals to act as a collective. Various mechanisms ensure that collectives are composed of related, cooperating cells, thus allowing for the evolution and stability of these traits, and for selection to favour traits beneficial to the collective. Since microbes are difficult to observe directly, sociality in natural populations can instead be investigated using evolutionary genetic signatures, as social loci can be evolutionary hotspots. The budding yeast has been studied for over a century, yet little is known about its social behaviour in nature. Flo11 is a highly regulated cell adhesin required for most laboratory social phenotypes; studies suggest it may function in cell recognition and its heterogeneous expression may be adaptive for collectives such as biofilms. We investigated this locus and found positive selection in the areas implicated in cell-cell interaction, suggesting selection for kin discrimination. We also found balancing selection at an upstream activation site, suggesting selection on the level of variegated gene expression. Our results suggest this model yeast is surprisingly social in natural environments and is probably engaging in various forms of sociality. By using genomic data, this research provides a glimpse of otherwise unobservable interactions.
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Affiliation(s)
- Zachary J Oppler
- Department of Biology, William & Mary, PO Box 8795, Williamsburg, VA 23187-8795, USA
| | - Meadow E Parrish
- Department of Biology, William & Mary, PO Box 8795, Williamsburg, VA 23187-8795, USA
| | - Helen A Murphy
- Department of Biology, William & Mary, PO Box 8795, Williamsburg, VA 23187-8795, USA
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