1
|
Mathieu-Bégné E, Blanchet S, Mitta G, Le Potier C, Loot G, Rey O. Transcriptomic Adjustments in a Freshwater Ectoparasite Reveal the Role of Molecular Plasticity for Parasite Host Shift. Genes (Basel) 2022; 13:genes13030525. [PMID: 35328078 PMCID: PMC8952325 DOI: 10.3390/genes13030525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 03/09/2022] [Accepted: 03/11/2022] [Indexed: 02/01/2023] Open
Abstract
A parasite’s lifestyle is characterized by a critical dependency on its host for feeding, shelter and/or reproduction. The ability of parasites to exploit new host species can reduce the risk associated with host dependency. The number of host species that can be infected by parasites strongly affects their ecological and evolutionary dynamics along with their pathogenic effects on host communities. However, little is known about the processes and the pathways permitting parasites to successfully infect alternative host species, a process known as host shift. Here, we tested whether molecular plasticity changes in gene expression and in molecular pathways could favor host shift in parasites. Focusing on an invasive parasite, Tracheliastes polycolpus, infecting freshwater fish, we conducted a transcriptomic study to compare gene expression in parasites infecting their main host species and two alternative host species. We found 120 significant differentially expressed genes (DEGs) between parasites infecting the different host species. A total of 90% of the DEGs were identified between parasites using the main host species and those using the two alternative host species. Only a few significant DEGs (seven) were identified when comparing parasites from the two alternative host species. Molecular pathways enriched in DEGs and associated with the use of alternative host species were related to cellular machinery, energetic metabolism, muscle activity and oxidative stress. This study strongly suggests that molecular plasticity is an important mechanism sustaining the parasite’s ability to infect alternative hosts.
Collapse
Affiliation(s)
- Eglantine Mathieu-Bégné
- Laboratoire Evolution et Diversité Biologique (UMR5174), Institut de Recherche pour le Développement, Centre National pour la Recherche Scientifique, Université Paul Sabatier, 118 Route de Narbonne, F-31062 Toulouse, France; (S.B.); (C.L.P.)
- Station d’Ecologie Théorique et Expérimentale (UPR 2001), Centre National pour la Recherche Scientifique, 2 Route du CNRS, F-09200 Moulis, France
- Interactions Hôtes-Pathogènes-Environnement (UMR5244 IHPE), CNRS, Université de Montpellier, Ifremer, Université de Perpignan Via Domitia, F-66000 Perpignan, France;
- Correspondence: (E.M.-B.); (G.L.)
| | - Simon Blanchet
- Laboratoire Evolution et Diversité Biologique (UMR5174), Institut de Recherche pour le Développement, Centre National pour la Recherche Scientifique, Université Paul Sabatier, 118 Route de Narbonne, F-31062 Toulouse, France; (S.B.); (C.L.P.)
- Station d’Ecologie Théorique et Expérimentale (UPR 2001), Centre National pour la Recherche Scientifique, 2 Route du CNRS, F-09200 Moulis, France
| | - Guillaume Mitta
- UMR EIO, ILM, IRD, Ifremer, University Polynesie Francaise, Taravao F-98719, Tahiti, French Polynesia;
| | - Clément Le Potier
- Laboratoire Evolution et Diversité Biologique (UMR5174), Institut de Recherche pour le Développement, Centre National pour la Recherche Scientifique, Université Paul Sabatier, 118 Route de Narbonne, F-31062 Toulouse, France; (S.B.); (C.L.P.)
| | - Géraldine Loot
- Laboratoire Evolution et Diversité Biologique (UMR5174), Institut de Recherche pour le Développement, Centre National pour la Recherche Scientifique, Université Paul Sabatier, 118 Route de Narbonne, F-31062 Toulouse, France; (S.B.); (C.L.P.)
- Institut Universitaire de France, Université Paul Sabatier, CEDEX 05, F-75231 Paris, France
- Correspondence: (E.M.-B.); (G.L.)
| | - Olivier Rey
- Interactions Hôtes-Pathogènes-Environnement (UMR5244 IHPE), CNRS, Université de Montpellier, Ifremer, Université de Perpignan Via Domitia, F-66000 Perpignan, France;
| |
Collapse
|
2
|
Buckingham LJ, Ashby B. Coevolutionary theory of hosts and parasites. J Evol Biol 2022; 35:205-224. [PMID: 35030276 PMCID: PMC9305583 DOI: 10.1111/jeb.13981] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 12/14/2021] [Accepted: 01/05/2022] [Indexed: 11/30/2022]
Abstract
Host and parasite evolution are closely intertwined, with selection for adaptations and counter‐adaptations forming a coevolutionary feedback loop. Coevolutionary dynamics are often difficult to intuit due to these feedbacks and are hard to demonstrate empirically in most systems. Theoretical models have therefore played a crucial role in shaping our understanding of host–parasite coevolution. Theoretical models vary widely in their assumptions, approaches and aims, and such variety makes it difficult, especially for non‐theoreticians and those new to the field, to: (1) understand how model approaches relate to one another; (2) identify key modelling assumptions; (3) determine how model assumptions relate to biological systems; and (4) reconcile the results of different models with contrasting assumptions. In this review, we identify important model features, highlight key results and predictions and describe how these pertain to model assumptions. We carry out a literature survey of theoretical studies published since the 1950s (n = 219 papers) to support our analysis. We identify two particularly important features of models that tend to have a significant qualitative impact on the outcome of host–parasite coevolution: population dynamics and the genetic basis of infection. We also highlight the importance of other modelling features, such as stochasticity and whether time proceeds continuously or in discrete steps, that have received less attention but can drastically alter coevolutionary dynamics. We finish by summarizing recent developments in the field, specifically the trend towards greater model complexity, and discuss likely future directions for research.
Collapse
Affiliation(s)
- Lydia J Buckingham
- Department of Mathematical Sciences, University of Bath, Bath, UK, BA2 7AY.,Milner Centre for Evolution, University of Bath, Bath, UK, BA2 7AY
| | - Ben Ashby
- Department of Mathematical Sciences, University of Bath, Bath, UK, BA2 7AY.,Milner Centre for Evolution, University of Bath, Bath, UK, BA2 7AY
| |
Collapse
|
3
|
Ya'cob Z, Low VL, Tan TK, Noor-Izwan A, Lourdes EY, Ramli R, Takaoka H, Adler PH. Sexually anomalous individuals of the black fly Simulium trangense (Diptera: Simuliidae) infected with mermithid parasites (Nematoda: Mermithidae). Parasitol Res 2021; 120:1555-1561. [PMID: 33655351 DOI: 10.1007/s00436-021-07087-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 02/14/2021] [Indexed: 11/29/2022]
Abstract
Sexually anomalous individuals, typically intersexes or gynandromorphs, bear a mixture of male and female traits. Twelve sexually anomalous individuals of the black fly Simulium (Gomphostilbia) trangense Jitklang, Kuvangkadilok, Baimai, Takaoka & Adler were discovered among 49 adults reared from pupae. All 12 sexually anomalous adults were parasitized by mermithid nematodes, although five additional parasitized adults had no overt external anomalies. Sequence analysis of the 18S rRNA gene revealed that the mermithids, possibly representing a new species, are related to Mesomermis spp., with genetic distances of 5.09-6.87%. All 12 anomalous individuals had female phenotypical traits on the head, thorax, forelegs, midlegs, and claws, but male features on the left and right hind basitarsi. One individual had mixed male and female genitalia. The findings are in accord with the trend that mermithid infections are associated with sexually anomalous adult black flies.
Collapse
Affiliation(s)
- Zubaidah Ya'cob
- Tropical Infectious Diseases Research and Education Centre (TIDREC), Universiti Malaya, 50603, Kuala Lumpur, Malaysia.
| | - Van Lun Low
- Tropical Infectious Diseases Research and Education Centre (TIDREC), Universiti Malaya, 50603, Kuala Lumpur, Malaysia
| | - Tiong Kai Tan
- Department of Parasitology, Faculty of Medicine, Universiti Malaya, 50603, Kuala Lumpur, Malaysia
| | - Anas Noor-Izwan
- Tropical Infectious Diseases Research and Education Centre (TIDREC), Universiti Malaya, 50603, Kuala Lumpur, Malaysia
| | - Emmanuel Y Lourdes
- Tropical Infectious Diseases Research and Education Centre (TIDREC), Universiti Malaya, 50603, Kuala Lumpur, Malaysia
| | - Rosli Ramli
- Institute of Biological Sciences, Faculty of Science, Universiti Malaya, 50603, Kuala Lumpur, Malaysia
| | - Hiroyuki Takaoka
- Tropical Infectious Diseases Research and Education Centre (TIDREC), Universiti Malaya, 50603, Kuala Lumpur, Malaysia
| | - Peter H Adler
- Department of Plant and Environmental Sciences, Clemson University, Clemson, SC, 29634-0310, USA
| |
Collapse
|
4
|
Bulteel L, Houwenhuyse S, Declerck SAJ, Decaestecker E. The Role of Microbiome and Genotype in Daphnia magna upon Parasite Re-Exposure. Genes (Basel) 2021; 12:70. [PMID: 33430247 PMCID: PMC7825712 DOI: 10.3390/genes12010070] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/31/2020] [Accepted: 01/05/2021] [Indexed: 02/07/2023] Open
Abstract
Recently, it has been shown that the community of gut microorganisms plays a crucial role in host performance with respect to parasite tolerance. Knowledge, however, is lacking on the role of the gut microbiome in mediating host tolerance after parasite re-exposure, especially considering multiple parasite infections. We here aimed to fill this knowledge gap by studying the role of the gut microbiome on tolerance in Daphnia magna upon multiple parasite species re-exposure. Additionally, we investigated the role of the host genotype in the interaction between the gut microbiome and the host phenotypic performance. A microbiome transplant experiment was performed in which three germ-free D. magna genotypes were exposed to a gut microbial inoculum and a parasite community treatment. The gut microbiome inocula were pre-exposed to the same parasite communities or a control treatment. Daphnia performance was monitored, and amplicon sequencing was performed to characterize the gut microbial community. Our experimental results showed that the gut microbiome plays no role in Daphnia tolerance upon parasite re-exposure. We did, however, find a main effect of the gut microbiome on Daphnia body size reflecting parasite specific responses. Our results also showed that it is rather the Daphnia genotype, and not the gut microbiome, that affected parasite-induced host mortality. Additionally, we found a role of the genotype in structuring the gut microbial community, both in alpha diversity as in the microbial composition.
Collapse
Affiliation(s)
- Lore Bulteel
- Laboratory of Aquatic Biology, Department of Biology, University of Leuven-Campus Kulak, E. Sabbelaan 53, 8500 Kortrijk, Belgium; (S.H.); (E.D.)
| | - Shira Houwenhuyse
- Laboratory of Aquatic Biology, Department of Biology, University of Leuven-Campus Kulak, E. Sabbelaan 53, 8500 Kortrijk, Belgium; (S.H.); (E.D.)
| | - Steven A. J. Declerck
- Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, 6700 AB Wageningen, The Netherlands;
- Laboratory of Aquatic Ecology, Evolution and Conservation, Department of Biology, KULeuven, 3000 Leuven, Belgium
| | - Ellen Decaestecker
- Laboratory of Aquatic Biology, Department of Biology, University of Leuven-Campus Kulak, E. Sabbelaan 53, 8500 Kortrijk, Belgium; (S.H.); (E.D.)
| |
Collapse
|
5
|
Timing of infestation influences virulence and parasite success in a dynamic multi-host-parasite interaction between the invasive parasite, Philornis downsi, and Darwin's finches. Oecologia 2020; 195:249-259. [PMID: 33258992 PMCID: PMC7882474 DOI: 10.1007/s00442-020-04807-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Accepted: 11/16/2020] [Indexed: 12/30/2022]
Abstract
Recently commenced host–parasite interactions provide an excellent opportunity to study co-evolutionary processes. Multi-host systems are especially informative because variation in virulence between hosts and temporal changes provides insight into evolutionary dynamics. However, empirical data under natural conditions are scarce. In the present study, we investigated the interaction between Darwin’s finches and the invasive fly Philornis downsi whose larvae feed on the blood of nestlings. Recently, however, the fly has changed its behavior and now also attacks incubating females. Two sympatric hosts are affected differently by the parasite and parasite load has changed over time. Our study observed a reversal of trends described two decades ago: while, currently, small tree finches (Camarhynchus parvulus) experience significantly higher parasite load than warbler finches (Certhidea olivacea), this was the opposite two decades ago. Currently, fledging success is higher in warbler finches compared to small tree finches. Our data indicate that not only intensity but also timing of infestation influences hosts’ reproductive success and parasite fitness. During incubation, prevalence was higher in warbler finches, but once chicks had hatched, prevalence was 100% in both species and parasite load was higher in small tree finches. Furthermore, our results suggest faster development and higher reproductive success of P. downsi in small tree finch nests. A change in host preference driven by larvae competition could have led to the reversal in parasite load.
Collapse
|
6
|
Zárate-Potes A, Yang W, Pees B, Schalkowski R, Segler P, Andresen B, Haase D, Nakad R, Rosenstiel P, Tetreau G, Colletier JP, Schulenburg H, Dierking K. The C. elegans GATA transcription factor elt-2 mediates distinct transcriptional responses and opposite infection outcomes towards different Bacillus thuringiensis strains. PLoS Pathog 2020; 16:e1008826. [PMID: 32970778 PMCID: PMC7513999 DOI: 10.1371/journal.ppat.1008826] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Accepted: 07/21/2020] [Indexed: 12/20/2022] Open
Abstract
The nematode Caenorhabditis elegans has been extensively used as a model for the study of innate immune responses against bacterial pathogens. While it is well established that the worm mounts distinct transcriptional responses to different bacterial species, it is still unclear in how far it can fine-tune its response to different strains of a single pathogen species, especially if the strains vary in virulence and infection dynamics. To rectify this knowledge gap, we systematically analyzed the C. elegans response to two strains of Bacillus thuringiensis (Bt), MYBt18247 (Bt247) and MYBt18679 (Bt679), which produce different pore forming toxins (PFTs) and vary in infection dynamics. We combined host transcriptomics with cytopathological characterizations and identified both a common and also a differentiated response to the two strains, the latter comprising almost 10% of the infection responsive genes. Functional genetic analyses revealed that the AP-1 component gene jun-1 mediates the common response to both Bt strains. In contrast, the strain-specific response is mediated by the C. elegans GATA transcription factor ELT-2, a homolog of Drosophila SERPENT and vertebrate GATA4-6, and a known master regulator of intestinal responses in the nematode. elt-2 RNAi knockdown decreased resistance to Bt679, but remarkably, increased survival on Bt247. The elt-2 silencing-mediated increase in survival was characterized by reduced intestinal tissue damage despite a high pathogen burden and might thus involve increased tolerance. Additional functional genetic analyses confirmed the involvement of distinct signaling pathways in the C. elegans defense response: the p38-MAPK pathway acts either directly with or in parallel to elt-2 in mediating resistance to Bt679 infection but is not required for protection against Bt247. Our results further suggest that the elt-2 silencing-mediated increase in survival on Bt247 is multifactorial, influenced by the nuclear hormone receptors NHR-99 and NHR-193, and may further involve lipid metabolism and detoxification. Our study highlights that the nematode C. elegans with its comparatively simple immune defense system is capable of generating a differentiated response to distinct strains of the same pathogen species. Importantly, our study provides a molecular insight into the diversity of biological processes that are influenced by a single master regulator and jointly determine host survival after pathogen infection.
Collapse
Affiliation(s)
- Alejandra Zárate-Potes
- Department of Evolutionary Ecology and Genetics, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Wentao Yang
- Department of Evolutionary Ecology and Genetics, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Barbara Pees
- Department of Evolutionary Ecology and Genetics, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Rebecca Schalkowski
- Department of Evolutionary Ecology and Genetics, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Philipp Segler
- Department of Evolutionary Ecology and Genetics, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Bentje Andresen
- Department of Evolutionary Ecology and Genetics, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Daniela Haase
- Department of Evolutionary Ecology and Genetics, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Rania Nakad
- Department of Evolutionary Ecology and Genetics, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Philip Rosenstiel
- Institute for Clinical Molecular Biology (IKMB), Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Guillaume Tetreau
- Univ. Grenoble Alpes, CNRS, CEA, Institut de Biologie Structurale, Grenoble, France
| | | | - Hinrich Schulenburg
- Department of Evolutionary Ecology and Genetics, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
- Max Planck Institute for Evolutionary Biology, Ploen, Germany
| | - Katja Dierking
- Department of Evolutionary Ecology and Genetics, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| |
Collapse
|
7
|
Facilitative priority effects drive parasite assembly under coinfection. Nat Ecol Evol 2020; 4:1510-1521. [PMID: 32868915 DOI: 10.1038/s41559-020-01289-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 07/22/2020] [Indexed: 12/14/2022]
Abstract
Host individuals are often coinfected with diverse parasite assemblages, resulting in complex interactions among parasites within hosts. Within hosts, priority effects occur when the infection sequence alters the outcome of interactions among parasites. Yet, the role of host immunity in this process remains poorly understood. We hypothesized that the host response to the first infection could generate priority effects among parasites, altering the assembly of later-arriving strains during epidemics. We tested this by infecting sentinel host genotypes of Plantago lanceolata with strains of the fungal parasite Podosphaera plantaginis and measuring susceptibility to subsequent infection during experimental and natural epidemics. In these experiments, prior infection by one strain often increased susceptibility to other strains, and these facilitative priority effects altered the structure of parasite assemblages, but this effect depended on host genotype, host population and parasite genotype. Thus, host genotype, spatial structure and priority effects among strains all independently altered parasite assembly. Using a fine-scale survey and sampling of infections on wild hosts in several populations, we then identified a signal of facilitative priority effects, which altered parasite assembly during natural epidemics. Together, these results provide evidence that within-host priority effects of early-arriving strains can drive parasite assembly, with implications for how strain diversity is spatially and temporally distributed during epidemics.
Collapse
|
8
|
Gibson AK, White PS, Penley MJ, de Roode JC, Morran LT. An experimental test of parasite adaptation to common versus rare host genotypes. Biol Lett 2020. [DOI: 10.1098/rsbl.2020.0210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
A core hypothesis in coevolutionary theory proposes that parasites adapt to specifically infect common host genotypes. Under this hypothesis, parasites function as agents of negative frequency-dependent selection, favouring rare host genotypes. This parasite-mediated advantage of rarity is key to the idea that parasites maintain genetic variation and select for outcrossing in host populations. Here, we report the results of an experimental test of parasite adaptation to common versus rare host genotypes. We selected the bacterial parasite
Serratia marcescens
to kill
Caenorhabdiis elegans
hosts in uneven mixtures of host genotypes. To examine the effect of commonness itself, independent of host identity, each of four host genotypes was represented as common or rare in experimental host mixtures. After experimental selection, we evaluated a parasite line's change in virulence—the selected fitness trait—on its rare and common host genotypes. Our results were consistent with a slight advantage for rare host genotypes: on average, parasites lost virulence against rare genotypes but not against common genotypes. The response varied substantially, however, with distinct patterns across host genotype mixtures. These findings support the potential for parasites to impose negative frequency-dependent selection, while emphasizing that the cost of being common may vary with host genotype.
Collapse
Affiliation(s)
- Amanda K. Gibson
- Department of Biology, Emory University, Atlanta, GA 30322
- Department of Biology, University of Virginia, Virginia 22904, USA
| | - P. Signe White
- Department of Biology, Emory University, Atlanta, GA 30322
- Population Biology, Ecology, and Evolution Graduate Program, Laney Graduate School, Emory University, Atlanta, GA 30322
| | | | | | - Levi T. Morran
- Department of Biology, Emory University, Atlanta, GA 30322
| |
Collapse
|
9
|
Sapp JR, Yost J, Lyon BE. The socially parasitic ant Polyergus mexicanus has host-associated genetic population structure and related neighbouring colonies. Mol Ecol 2020; 29:2050-2062. [PMID: 32402118 DOI: 10.1111/mec.15468] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 03/25/2020] [Accepted: 04/28/2020] [Indexed: 11/28/2022]
Abstract
The genetic structure of populations can be both a cause and a consequence of ecological interactions. For parasites, genetic structure may be a consequence of preferences for host species or of mating behaviour. Conversely, genetic structure can influence where conspecific interactions among parasites lay on a spectrum from cooperation to conflict. We used microsatellite loci to characterize the genetic structure of a population of the socially parasitic dulotic (aka "slave-making") ant (Polyergus mexicanus), which is known for its host-specificity and conspecific aggression. First, we assessed whether the pattern of host species use by the parasite has influenced parasite population structure. We found that host species use was correlated with subpopulation structure, but this correlation was imperfect: some subpopulations used one host species nearly exclusively, while others used several. Second, we examined the viscosity of the parasite population by measuring the relatedness of pairs of neighbouring parasitic ant colonies at varying distances from each other. Although natural history observations of local dispersal by queens suggested the potential for viscosity, there was no strong correlation between relatedness and distance between colonies. However, 35% of colonies had a closely related neighbouring colony, indicating that kinship could potentially affect the nature of some interactions between colonies of this social parasite. Our findings confirm that ecological forces like host species selection can shape the genetic structure of parasite populations, and that such genetic structure has the potential to influence parasite-parasite interactions in social parasites via inclusive fitness.
Collapse
Affiliation(s)
- Joseph R Sapp
- Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA, USA
| | - Jenn Yost
- Biological Sciences Department, California Polytechnic State University, San Luis Obispo, CA, USA
| | - Bruce E Lyon
- Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, CA, USA
| |
Collapse
|
10
|
Tepolt CK, Darling JA, Blakeslee AMH, Fowler AE, Torchin ME, Miller AW, Ruiz GM. Recent introductions reveal differential susceptibility to parasitism across an evolutionary mosaic. Evol Appl 2020; 13:545-558. [PMID: 32431735 PMCID: PMC7045710 DOI: 10.1111/eva.12865] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 08/09/2019] [Accepted: 08/14/2019] [Indexed: 12/26/2022] Open
Abstract
Parasitism can represent a potent agent of selection, and introduced parasites have the potential to substantially alter their new hosts' ecology and evolution. While significant impacts have been reported for parasites that switch to new host species, the effects of macroparasite introduction into naïve populations of host species with which they have evolved remain poorly understood. Here, we investigate how the estuarine white-fingered mud crab (Rhithropanopeus harrisii) has adapted to parasitism by an introduced rhizocephalan parasite (Loxothylacus panopaei) that castrates its host. While the host crab is native to much of the East and Gulf Coasts of North America, its parasite is native only to the southern end of this range. Fifty years ago, the parasite invaded the mid-Atlantic, gradually expanding through previously naïve host populations. Thus, different populations of the same host species have experienced different degrees of historical interaction (and thus potential evolutionary response time) with the parasite: long term, short term, and naïve. In nine estuaries across this range, we examined whether and how parasite prevalence and host susceptibility to parasitism differs depending on the length of the host's history with the parasite. In field surveys, we found that the parasite was significantly more prevalent in its introduced range (i.e., short-term interaction) than in its native range (long-term interaction), a result that was also supported by a meta-analysis of prevalence data covering the 50 years since its introduction. In controlled laboratory experiments, host susceptibility to parasitism was significantly higher in naïve hosts than in hosts from the parasite's native range, suggesting that host resistance to parasitism is under selection. These results suggest that differences in host-parasite historical interaction can alter the consequences of parasite introductions in host populations. As anthropogenically driven range shifts continue, disruptions of host-parasite evolutionary relationships may become an increasingly important driver of ecological and evolutionary change.
Collapse
Affiliation(s)
- Carolyn K. Tepolt
- Department of BiologyWoods Hole Oceanographic InstitutionWoods HoleMAUSA
- Smithsonian Environmental Research CenterEdgewaterMDUSA
| | - John A. Darling
- National Exposure Research LaboratoryUS Environmental Protection AgencyResearch Triangle ParkNCUSA
| | | | - Amy E. Fowler
- Department of Environmental Science and PolicyGeorge Mason UniversityFairfaxVAUSA
| | - Mark E. Torchin
- Smithsonian Tropical Research InstituteBalboaAnconRepublic of Panama
| | | | | |
Collapse
|
11
|
Ben-Ami F, Orlic C, Regoes RR. Disentangling non-specific and specific transgenerational immune priming components in host-parasite interactions. Proc Biol Sci 2020; 287:20192386. [PMID: 32075526 PMCID: PMC7031663 DOI: 10.1098/rspb.2019.2386] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Exposure to a pathogen primes many organisms to respond faster or more efficiently to subsequent exposures. Such priming can be non-specific or specific, and has been found to extend across generations. Disentangling and quantifying specific and non-specific effects is essential for understanding the genetic epidemiology of a system. By combining a large infection experiment and mathematical modelling, we disentangle different transgenerational effects in the crustacean model Daphnia magna exposed to different strains of the bacterial parasite Pasteuria ramosa. In the experiment, we exposed hosts to a high dose of one of three parasite strains, and subsequently challenged their offspring with multiple doses of the same (homologous) or a different (heterologous) strain. We find that exposure of Daphnia to Pasteuria decreases the susceptibility of their offspring by approximately 50%. This transgenerational protection is not larger for homologous than for heterologous parasite challenges. Methodologically, our work represents an important contribution not only to the analysis of immune priming in ecological systems but also to the experimental assessment of vaccines. We present, for the first time, an inference framework to investigate specific and non-specific effects of immune priming on the susceptibility distribution of hosts—effects that are central to understanding immunity and the effect of vaccines.
Collapse
Affiliation(s)
- Frida Ben-Ami
- School of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Christian Orlic
- Zoologisches Institut, Evolutionsbiologie, Universität Basel, Vesalgasse 1, Basel 4051, Switzerland
| | - Roland R Regoes
- Institute of Integrative Biology, ETH Zurich, Zurich 8092, Switzerland
| |
Collapse
|
12
|
Gao K, Muijderman D, Nichols S, Heckel DG, Wang P, Zalucki MP, Groot AT. Parasite-host specificity: A cross-infection study of the parasite Ophryocystis elektroscirrha. J Invertebr Pathol 2020; 170:107328. [PMID: 31952966 DOI: 10.1016/j.jip.2020.107328] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 12/18/2019] [Accepted: 01/11/2020] [Indexed: 11/19/2022]
Abstract
Many parasites are constrained to only one or a few hosts, showing host specificity. It remains unclear why some parasites are specialists and other parasites are generalists. The parasite Ophryocystis elektroscirrha (OE) is a neogregarine protozoan thought to be restricted to monarch butterflies, Danaus plexippus (Nymphaliae) and D. gilippus. Recently, we found OE-like spores in other Lepidoptera, specifically in three noctuid moths: Helicoverpa armigera, H. assulta and H. punctigera, as well as another nymphalid, Parthenos sylvia. To our knowledge, this is the first report of OE-like parasite infections in species other than the genus Danaus. In sequencing 558 bp of 18S rRNA, we found the genetic similarity between OE from D. plexippus and OE-like parasite from the moths H. armigera and H. punctigera to be 95.2%. When we conducted cross-species infection experiments, we could not infect the moths with OE from D. plexippus, but OE-like parasite from H. armigera did infect D. plexippus and a closely related moth species Heliothis virescens. Interestingly, we did not find the OE-like parasite in the H. armigera population from Spain. Inter-population infection experiments with H. armigera demonstrated a higher sensitivity to OE-like infection in the population from Spain compared to the populations from Australia and China. These results suggest geographic variation in OE-like susceptibility and coevolution between parasite and host. Our findings give important new insights into the prevalence and host specificity of OE and OE-like parasites, and provide opportunities to study parasite transmission over spatial and temporal scales.
Collapse
Affiliation(s)
- Ke Gao
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, Amsterdam, the Netherlands.
| | - Daphne Muijderman
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, Amsterdam, the Netherlands
| | - Sarah Nichols
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, Amsterdam, the Netherlands
| | - David G Heckel
- Max Planck Institute for Chemical Ecology, Department of Entomology, Jena, Germany
| | - Peng Wang
- School of Biological Science, The University of Queensland, 4072 Brisbane, Australia
| | - Myron P Zalucki
- School of Biological Science, The University of Queensland, 4072 Brisbane, Australia
| | - Astrid T Groot
- Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, Amsterdam, the Netherlands; Max Planck Institute for Chemical Ecology, Department of Entomology, Jena, Germany
| |
Collapse
|
13
|
Experimental study of micro-habitat selection by ixodid ticks feeding on avian hosts. Int J Parasitol 2019; 49:1005-1014. [PMID: 31734336 DOI: 10.1016/j.ijpara.2019.09.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 09/07/2019] [Accepted: 09/10/2019] [Indexed: 01/18/2023]
Abstract
Mechanisms of on-host habitat selection of parasites are important to the understanding of host-parasite interactions and evolution. To this end, it is important to separate the factors driving parasite micro-habitat selection from those resulting from host anti-parasite behaviour. We experimentally investigated whether tick infestation patterns on songbirds are the result of an active choice by the ticks themselves, or the outcome of songbird grooming behaviour. Attachment patterns of three ixodid tick species with different ecologies and host specificities were studied on avian hosts. Ixodes arboricola, Ixodes ricinus and Ixodes frontalis were put on the head, belly and back of adult great tits (Parus major) and adult domestic canaries (Serinus canaria domestica) which were either restricted or not in their grooming capabilities. Without exception, ticks were eventually found on a bird's head. When we gave ticks full opportunities to attach on other body parts - in the absence of host grooming - they showed lower attachment success. Moreover, ticks moved from these other body parts to the host's head when given the opportunity. This study provides evidence that the commonly observed pattern of ticks feeding on songbirds' heads is the result of an adaptive behavioural strategy. Experimental data on a novel host species, the domestic canary, and a consistent number of published field observations, strongly support this hypothesis. We address some proximate and ultimate causes that may explain parasite preference for this body part in songbirds. The link found between parasite micro-habitat preference and host anti-parasite behaviour provides further insight into the mechanisms driving ectoparasite aggregation, which is important for the population dynamics of hosts, ectoparasites and the micro-pathogens for which they are vectors.
Collapse
|
14
|
Dallas TA, Laine AL, Ovaskainen O. Detecting parasite associations within multi-species host and parasite communities. Proc Biol Sci 2019; 286:20191109. [PMID: 31575371 PMCID: PMC6790755 DOI: 10.1098/rspb.2019.1109] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 09/11/2019] [Indexed: 01/23/2023] Open
Abstract
Understanding the role of biotic interactions in shaping natural communities is a long-standing challenge in ecology. It is particularly pertinent to parasite communities sharing the same host communities and individuals, as the interactions among parasites-both competition and facilitation-may have far-reaching implications for parasite transmission and evolution. Aggregated parasite burdens may suggest that infected host individuals are either more prone to infection, or that infection by a parasite species facilitates another, leading to a positive parasite-parasite interaction. However, parasite species may also compete for host resources, leading to the prediction that parasite-parasite associations would be generally negative, especially when parasite species infect the same host tissue, competing for both resources and space. We examine the presence and strength of parasite associations using hierarchical joint species distribution models fitted to data on resident parasite communities sampled on over 1300 small mammal individuals across 22 species and their resident parasite communities. On average, we detected more positive associations between infecting parasite species than negative, with the most negative associations occurring when two parasite species infected the same host tissue, suggesting that parasite species associations may be quantifiable from observational data. Overall, our findings suggest that parasite community prediction at the level of the individual host is possible, and that parasite species associations may be detectable in complex multi-species communities, generating many hypotheses concerning the effect of host community changes on parasite community composition, parasite competition within infected hosts, and the drivers of parasite community assembly and structure.
Collapse
Affiliation(s)
- Tad A. Dallas
- Organismal and Evolutionary Biology Research Programme, University of Helsinki, PO Box 65, Helsinki 00014, Finland
- Department of Biological Sciences, Louisiana State University, Baton Rouge, LA, USA
| | - Anna-Liisa Laine
- Organismal and Evolutionary Biology Research Programme, University of Helsinki, PO Box 65, Helsinki 00014, Finland
- Department of Evolutionary Biology and Environmental Studies, University of Zürich, Zürich 8057, Switzerland
| | - Otso Ovaskainen
- Organismal and Evolutionary Biology Research Programme, University of Helsinki, PO Box 65, Helsinki 00014, Finland
- Centre for Biodiversity Dynamics, Department of Biology, Norwegian University of Science and Technology, Trondheim 7491, Norway
| |
Collapse
|
15
|
Inferring host-cleptoparasite complexes of South American Centridine bees (Hymenoptera: Apidae) using macroecological perspectives. ORG DIVERS EVOL 2019. [DOI: 10.1007/s13127-019-00394-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
16
|
Tartally A, Thomas JA, Anton C, Balletto E, Barbero F, Bonelli S, Bräu M, Casacci LP, Csősz S, Czekes Z, Dolek M, Dziekańska I, Elmes G, Fürst MA, Glinka U, Hochberg ME, Höttinger H, Hula V, Maes D, Munguira ML, Musche M, Nielsen PS, Nowicki P, Oliveira PS, Peregovits L, Ritter S, Schlick-Steiner BC, Settele J, Sielezniew M, Simcox DJ, Stankiewicz AM, Steiner FM, Švitra G, Ugelvig LV, Van Dyck H, Varga Z, Witek M, Woyciechowski M, Wynhoff I, Nash DR. Patterns of host use by brood parasitic Maculinea butterflies across Europe. Philos Trans R Soc Lond B Biol Sci 2019; 374:20180202. [PMID: 30967080 PMCID: PMC6388033 DOI: 10.1098/rstb.2018.0202] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/30/2018] [Indexed: 11/12/2022] Open
Abstract
The range of hosts exploited by a parasite is determined by several factors, including host availability, infectivity and exploitability. Each of these can be the target of natural selection on both host and parasite, which will determine the local outcome of interactions, and potentially lead to coevolution. However, geographical variation in host use and specificity has rarely been investigated. Maculinea (= Phengaris) butterflies are brood parasites of Myrmica ants that are patchily distributed across the Palæarctic and have been studied extensively in Europe. Here, we review the published records of ant host use by the European Maculinea species, as well as providing new host ant records for more than 100 sites across Europe. This comprehensive survey demonstrates that while all but one of the Myrmica species found on Maculinea sites have been recorded as hosts, the most common is often disproportionately highly exploited. Host sharing and host switching are both relatively common, but there is evidence of specialization at many sites, which varies among Maculinea species. We show that most Maculinea display the features expected for coevolution to occur in a geographic mosaic, which has probably allowed these rare butterflies to persist in Europe. This article is part of the theme issue 'The coevolutionary biology of brood parasitism: from mechanism to pattern'.
Collapse
Affiliation(s)
- András Tartally
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, 4032, Debrecen, Egyetem tér 1 Hungary
- Centre for Social Evolution, Department of Biology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark
| | | | - Christian Anton
- Department of Community Ecology, UFZ-Helmholtz Centre for Environmental Research, Theodor-Lieser-Strasse 4, 06120 Halle, Germany
| | - Emilio Balletto
- Department of Life Sciences and Systems Biology, University of Turin, Turin 10123, Italy
| | - Francesca Barbero
- Department of Life Sciences and Systems Biology, University of Turin, Turin 10123, Italy
| | - Simona Bonelli
- Department of Life Sciences and Systems Biology, University of Turin, Turin 10123, Italy
| | | | - Luca Pietro Casacci
- Department of Life Sciences and Systems Biology, University of Turin, Turin 10123, Italy
- Laboratory of Social and Myrmecophilous Insects, Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00-679 Warszawa, Poland
| | - Sándor Csősz
- MTA-ELTE-MTM Ecology Research Group, Pázmány Péter sétány 1/C, Budapest, H1117, Hungary
| | - Zsolt Czekes
- Hungarian Department of Biology and Ecology, Babeş-Bolyai University, Clinicilor St 5–7, 400006 Cluj-Napoca, Romania
| | - Matthias Dolek
- Büro Geyer und Dolek, Alpenblick 12, 82237 Wörthsee, Germany
| | - Izabela Dziekańska
- Institute of Biology, University of Bialystok, Ciołkowskiego 1 J, 15-245 Białystok, Poland
| | - Graham Elmes
- Centre for Ecology and Hydrology Wallingford, Maclean Building, Benson Lane, Wallingford OX10 8BB, UK
| | - Matthias A. Fürst
- Centre for Social Evolution, Department of Biology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark
| | - Uta Glinka
- Department of Community Ecology, UFZ-Helmholtz Centre for Environmental Research, Theodor-Lieser-Strasse 4, 06120 Halle, Germany
| | - Michael E. Hochberg
- Institut des Sciences de l'Evolution – CNRS UMR 5554, Université de Montpellier – CC 065, 34095 Montpellier Cedex 05, France Cedex 05, France
| | - Helmut Höttinger
- Institute of Zoology, Department of Integrative Biology and Biodiversity Research, University of Natural Resources and Live Sciences, Gregor-Mendel-Straße 33, 1180 Vienna, Austria
| | - Vladimir Hula
- Department of Zoology, Hydrobiology, Fishery and Apiculture, Faculty of AgriScience, Mendel University Brno, Zemedelska 1, Brno 61300, Czech Republic
| | - Dirk Maes
- Research Institute for Nature and Forest (INBO), Herman Teirlinckgebouw, Havenlaan 88 bus 73, 1000 Brussels, Belgium
| | - Miguel L. Munguira
- Facultad de Ciencias, Departamento de Biología (Zoología), Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Martin Musche
- Department of Community Ecology, UFZ-Helmholtz Centre for Environmental Research, Theodor-Lieser-Strasse 4, 06120 Halle, Germany
| | | | - Piotr Nowicki
- Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland
| | - Paula S. Oliveira
- Department of Forest Science and Landscape, Center for the Research and Technology of Agro-Environmental and Biological Sciences (CITAB)/University of Trás-os-Montes and Alto Douro, 5000-911 Vila Real, Portugal
| | - László Peregovits
- Department of Zoology, Hungarian Natural History Museum, 1088 Budapest Baross u. 13., Hungary
| | - Sylvia Ritter
- Department of Community Ecology, UFZ-Helmholtz Centre for Environmental Research, Theodor-Lieser-Strasse 4, 06120 Halle, Germany
| | - Birgit C. Schlick-Steiner
- Molecular Ecology Group, Department of Ecology, University of Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria
| | - Josef Settele
- Department of Community Ecology, UFZ-Helmholtz Centre for Environmental Research, Theodor-Lieser-Strasse 4, 06120 Halle, Germany
- German Centre for Integrative Biodiversity Research (iDiv), Halle-Jena-Leipzig, Deutscher Platz 5e, 04103 Leipzig, Germany
| | - Marcin Sielezniew
- Institute of Biology, University of Bialystok, Ciołkowskiego 1 J, 15-245 Białystok, Poland
| | - David J. Simcox
- Department of Zoology, University of Oxford, Oxford OX1 3PS, UK
- Centre for Ecology and Hydrology Wallingford, Maclean Building, Benson Lane, Wallingford OX10 8BB, UK
| | - Anna M. Stankiewicz
- Laboratory of Social and Myrmecophilous Insects, Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00-679 Warszawa, Poland
| | - Florian M. Steiner
- Molecular Ecology Group, Department of Ecology, University of Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria
| | - Giedrius Švitra
- Lithuanian Entomological Society, Akademijos 2, 08412 Vilnius, Lithuania
| | - Line V. Ugelvig
- Centre for Social Evolution, Department of Biology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark
| | - Hans Van Dyck
- Behavioural Ecology and Conservation Group, Biodiversity Research Centre, Earth and Life Institute, Université catholique de Louvain (UCL), Louvain-la-Neuve, Belgium
| | - Zoltán Varga
- Department of Evolutionary Zoology and Human Biology, University of Debrecen, 4032, Debrecen, Egyetem tér 1 Hungary
| | - Magdalena Witek
- Laboratory of Social and Myrmecophilous Insects, Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00-679 Warszawa, Poland
| | - Michal Woyciechowski
- Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland
| | - Irma Wynhoff
- Dutch Butterfly Conservation and Butterfly Conservation Europe, PO Box 506, 6700 AM Wageningen, The Netherlands
| | - David R. Nash
- Centre for Social Evolution, Department of Biology, University of Copenhagen, Universitetsparken 15, 2100 Copenhagen, Denmark
| |
Collapse
|
17
|
Hansel K, Bianchi L, Principato M, Moretta I, Principato S, Lanza F, Stingeni L. Occupational human infestation due to "Martin bug" (Oeciacus hirundinis, Hemiptera: Cimicidae). Int J Dermatol 2018; 58:e115-e116. [PMID: 30592295 DOI: 10.1111/ijd.14361] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 11/21/2018] [Accepted: 11/29/2018] [Indexed: 11/28/2022]
Affiliation(s)
- Katharina Hansel
- Section of Clinical, Allergological and Venereological Dermatology, Department of Medicine, University of Perugia, Perugia, Italy
| | - Leonardo Bianchi
- Section of Clinical, Allergological and Venereological Dermatology, Department of Medicine, University of Perugia, Perugia, Italy
| | - Mario Principato
- Department of Veterinary Medicine, University of Perugia, Perugia, Italy
| | - Iolanda Moretta
- Department of Veterinary Medicine, University of Perugia, Perugia, Italy
| | | | - Francesco Lanza
- Section of Clinical, Allergological and Venereological Dermatology, Department of Medicine, University of Perugia, Perugia, Italy
| | - Luca Stingeni
- Section of Clinical, Allergological and Venereological Dermatology, Department of Medicine, University of Perugia, Perugia, Italy
| |
Collapse
|
18
|
Agha R, Gross A, Rohrlack T, Wolinska J. Adaptation of a Chytrid Parasite to Its Cyanobacterial Host Is Hampered by Host Intraspecific Diversity. Front Microbiol 2018; 9:921. [PMID: 29867832 PMCID: PMC5952108 DOI: 10.3389/fmicb.2018.00921] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Accepted: 04/20/2018] [Indexed: 01/08/2023] Open
Abstract
Experimental evolution can be used to test for and characterize parasite and pathogen adaptation. We undertook a serial-passage experiment in which a single parasite population of the obligate fungal (chytrid) parasite Rhizophydium megarrhizum was maintained over a period of 200 days under different mono- and multiclonal compositions of its phytoplankton host, the bloom-forming cyanobacterium Planktothrix. Despite initially inferior performance, parasite populations under sustained exposure to novel monoclonal hosts experienced rapid fitness increases evidenced by increased transmission rates. This demonstrates rapid adaptation of chytrids to novel hosts and highlights their high evolutionary potential. In contrast, increased fitness was not detected in parasites exposed to multiclonal host mixtures, indicating that cyanobacterial intraspecific diversity hampers parasites adaptation. Significant increases in intensity of infection were observed in monoclonal and multiclonal treatments, suggesting high evolvability of traits involved in parasite attachment onto hosts (i.e., encystment). A comparison of the performance of evolved and unevolved (control) parasite populations against their common ancestral host did not reveal parasite attenuation. Our results exemplify the ability of chytrid parasites to adapt rapidly to new hosts, while providing experimental evidence that genetic diversity in host populations grants increased resistance to disease by hindering parasite adaptation.
Collapse
Affiliation(s)
- Ramsy Agha
- Department of Ecosystem Research, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany
| | - Alina Gross
- Department of Ecosystem Research, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany
- Institute of Biology, Freie Universität Berlin, Berlin, Germany
| | - Thomas Rohrlack
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway
| | - Justyna Wolinska
- Department of Ecosystem Research, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany
- Institute of Biology, Freie Universität Berlin, Berlin, Germany
| |
Collapse
|
19
|
Allewaert CC, Hiegle N, Strittmatter M, de Blok R, Guerra T, Gachon CM, Vyverman W. Life history determinants of the susceptibility of the blood alga Haematococcus to infection by Paraphysoderma sedebokerense (Blastocladiomycota). ALGAL RES 2018. [DOI: 10.1016/j.algal.2018.02.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
20
|
Vujanovic V, Kim SH. Adaptability of mitosporic stage in Sphaerodes mycoparasitica towards its mycoparasitic-polyphagous lifestyle. Mycologia 2018; 109:701-709. [PMID: 29336725 DOI: 10.1080/00275514.2017.1400303] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Sphaerodes mycoparasitica Vuj. is a Fusarium-specific mycoparasite. Some recent discoveries recognize its biotrophic polyphagous lifestyle as an interesting biocontrol property against a broad spectrum of mycotoxigenic Fusarium hosts. Secondary metabolites such as mycotoxins produced by Fusarium spp. may play an important role in the signaling process, allowing an early mycoparasite-host recognition. A multiple-paper-disc assay has been conducted to test S. mycoparasitica hyphal adaptability to filtrates of 12 Fusarium spp. This study shows that shifts of adapted and nonadapted hyphal migration towards different Fusarium-host filtrates may partly explain S. mycoparasitica polyphagous lifestyle, and its adaptability depending on host preference or compatibility. In terms of host compatibility, the current findings suggest that S. mycoparasitica tends to prefer native Fusarium hosts more related to its origin and propose that the mycoparasite could possess diphasic interactions such as biotrophic-attraction and antagonistic-inhibition relationships based on relative radial growth. This implies that the mycoparasite may use a group of mycotoxins produced by specific Fusarium spp. as an adaptive selective mechanism that facilitates a parasite-host recognition and further successful mycoparasitism. In particular, relative polarity or hydrophilicity/hydrophobicity of mycotoxins may be related to solubility and absorption properties in hyphae of the mycoparasite. Taken together, the studies of host compatibility and adaptability depending on host filtrates will aid in understanding complex mechanisms of S. mycoparasitica, as a promising model organism for a specific biotrophic mycoparasite to enhance and improve biocontrol efficacy against Fusaria.
Collapse
Affiliation(s)
- Vladimir Vujanovic
- a Department of Food and Bioproduct Sciences , University of Saskatchewan , 51 Campus Drive, Saskatoon , SK S7N 5A8 , Canada
| | - Seon Hwa Kim
- a Department of Food and Bioproduct Sciences , University of Saskatchewan , 51 Campus Drive, Saskatoon , SK S7N 5A8 , Canada
| |
Collapse
|
21
|
A comparison of genetic diversity and population structure of the endangered scaleshell mussel (Leptodea leptodon), the fragile papershell (Leptodea fragilis) and their host-fish the freshwater drum (Aplodinotus grunniens). CONSERV GENET 2017. [DOI: 10.1007/s10592-017-1015-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
22
|
Comparative Genomics of Bacillus thuringiensis Reveals a Path to Specialized Exploitation of Multiple Invertebrate Hosts. mBio 2017; 8:mBio.00822-17. [PMID: 28790205 PMCID: PMC5550751 DOI: 10.1128/mbio.00822-17] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Understanding the genetic basis of host shifts is a key genomic question for pathogen and parasite biology. The Bacillus cereus group, which encompasses Bacillus thuringiensis and Bacillus anthracis, contains pathogens that can infect insects, nematodes, and vertebrates. Since the target range of the essential virulence factors (Cry toxins) and many isolates is well known, this group presents a powerful system for investigating how pathogens can diversify and adapt to phylogenetically distant hosts. Specialization to exploit insects occurs at the level of the major clade and is associated with substantial changes in the core genome, and host switching between insect orders has occurred repeatedly within subclades. The transfer of plasmids with linked cry genes may account for much of the adaptation to particular insect orders, and network analysis implies that host specialization has produced strong associations between key toxin genes with similar targets. Analysis of the distribution of plasmid minireplicons shows that plasmids with orf156 and orf157, which carry genes encoding toxins against Lepidoptera or Diptera, were contained only by B. thuringiensis in the specialized insect clade (clade 2), indicating that tight genome/plasmid associations have been important in adaptation to invertebrate hosts. Moreover, the accumulation of multiple virulence factors on transposable elements suggests that cotransfer of diverse virulence factors is advantageous in terms of expanding the insecticidal spectrum, overcoming insect resistance, or through gains in pathogenicity via synergistic interactions between toxins.IMPORTANCE Population genomics have provided many new insights into the formation, evolution, and dynamics of bacterial pathogens of humans and other higher animals, but these pathogens usually have very narrow host ranges. As a pathogen of insects and nematodes, Bacillus thuringiensis, which produces toxins showing toxicity to many orders of insects and other invertebrates, can be used as a model to study the evolution of pathogens with wide host ranges. Phylogenomic analysis revealed that host specialization and switching occur at the level of the major clade and subclade, respectively. A toxin gene co-occurrence network indicates that multiple toxins with similar targets were accumulated by the same cell in the whole species. This accumulation may be one of the strategies that B. thuringiensis has used to fight against host resistance. This kind of formation and evolution of pathogens represents a different path used against multiple invertebrate hosts from that used against higher animals.
Collapse
|
23
|
Clark NJ, Clegg SM. Integrating phylogenetic and ecological distances reveals new insights into parasite host specificity. Mol Ecol 2017; 26:3074-3086. [PMID: 28295937 DOI: 10.1111/mec.14101] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Revised: 02/28/2017] [Accepted: 03/07/2017] [Indexed: 01/01/2023]
Abstract
The range of hosts a pathogen infects (host specificity) is a key element of disease risk that may be influenced by both shared phylogenetic history and shared ecological attributes of prospective hosts. Phylospecificity indices quantify host specificity in terms of host relatedness, but can fail to capture ecological attributes that increase susceptibility. For instance, similarity in habitat niche may expose phylogenetically unrelated host species to similar pathogen assemblages. Using a recently proposed method that integrates multiple distances, we assess the relative contributions of host phylogenetic and functional distances to pathogen host specificity (functional-phylogenetic host specificity). We apply this index to a data set of avian malaria parasite (Plasmodium and Haemoproteus spp.) infections from Melanesian birds to show that multihost parasites generally use hosts that are closely related, not hosts with similar habitat niches. We also show that host community phylogenetic ß-diversity (Pßd) predicts parasite Pßd and that individual host species carry phylogenetically clustered Haemoproteus parasite assemblages. Our findings were robust to phylogenetic uncertainty, and suggest that phylogenetic ancestry of both hosts and parasites plays important roles in driving avian malaria host specificity and community assembly. However, restricting host specificity analyses to either recent or historical timescales identified notable exceptions, including a 'habitat specialist' parasite that infects a diversity of unrelated host species with similar habitat niches. This work highlights that integrating ecological and phylogenetic distances provides a powerful approach to better understand drivers of pathogen host specificity and community assembly.
Collapse
Affiliation(s)
- Nicholas J Clark
- School of Veterinary Science, The University of Queensland, Gatton, Qld, 4343, Australia.,Environmental Futures Research Institute, Griffith University, Gold Coast, Qld, 4111, Australia
| | - Sonya M Clegg
- Department of Zoology, Edward Grey Institute of Field Ornithology, University of Oxford, Oxford, OX1 3PS, UK
| |
Collapse
|
24
|
Redman EM, Wilson K, Cory JS. Trade-offs and mixed infections in an obligate-killing insect pathogen. J Anim Ecol 2016; 85:1200-9. [PMID: 27155461 PMCID: PMC4988505 DOI: 10.1111/1365-2656.12547] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 04/24/2016] [Indexed: 02/01/2023]
Abstract
Natural populations of pathogens are frequently composed of numerous interacting strains. Understanding what maintains this diversity remains a key focus of research in disease ecology. In addition, within-host pathogen dynamics can have a strong impact on both infection outcome and the evolution of pathogen virulence, and thus, understanding the impact of pathogen diversity is important for disease management. We compared eight genetically distinguishable variants from Spodoptera exempta nucleopolyhedrovirus (SpexNPV) isolated from the African armyworm, Spodoptera exempta. NPVs are obligate killers, and the vast majority of transmission stages are not released until after the host has died. The NPV variants differed significantly in their virulence and could be clustered into two groups based on their dose-response curves. They also differed in their speed of kill and productivity (transmission potential) for S. exempta. The mixed-genotype wild-type (WT) SpexNPV, from which each variant was isolated, was significantly more virulent than any individual variant and its mean mortality rate was within the fastest group of individual variants. However, the WT virus produced fewer new infectious stages than any single variant, which might reflect competition among the variants. A survival analysis, combining the mortality and speed of kill data, confirmed the superiority of the genetically mixed WT virus over any single variant. Spodoptera exempta larvae infected with WT SpexNPV were predicted to die 2·7 and 1·9 times faster than insects infected with isolates from either of the two clusters of genotypes. Theory suggests that there are likely to be trade-offs between pathogen fitness traits. Across all larvae, there was a negative linear relationship between virus yield and speed of kill, such that more rapid host death carried the cost of producing fewer transmission stages. We also found a near-significant relationship for the same trend at the intervariant level. However, there was no evidence for a significant relationship between the induced level of mortality and transmission potential (virus yield) or speed of kill.
Collapse
Affiliation(s)
- Elizabeth M Redman
- Molecular Ecology and Biocontrol Group, NERC Centre for Ecology and Hydrology, Mansfield Road, Oxford, OX1 3SR, UK
| | - Kenneth Wilson
- Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK
| | - Jenny S Cory
- Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, V5A 1S6, BC, Canada
| |
Collapse
|
25
|
Wheeler DL, Johnson DA. Verticillium dahliae Infects, Alters Plant Biomass, and Produces Inoculum on Rotation Crops. PHYTOPATHOLOGY 2016; 106:602-13. [PMID: 26828231 DOI: 10.1094/phyto-07-15-0174-r] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Verticillium wilt, caused by Verticillium dahliae, reduces yields of potato and mint. Crop rotation is a potential management tactic for Verticillium wilt; however, the wide host range of V. dahliae may limit the effectiveness of this tactic. The hypothesis that rotation crops are infected by V. dahliae inoculum originating from potato and mint was tested by inoculation of mustards, grasses, and Austrian winter pea with eight isolates of V. dahliae. Inoculum density was estimated from plants and soil. Typical wilt symptoms were not observed in any rotation crop but plant biomass of some crops was reduced, not affected, or increased by infection of specific isolates. Each isolate was host-specific and infected a subset of the rotation crops tested but microsclerotia from at least one isolate were observed on each rotation crop. Some isolates were host-adapted and differentially altered plant biomass or produced differential amounts of inoculum on rotation crops like arugula and Austrian winter pea, which supported more inoculum of specific isolates than potato. Evidence of asymptomatic and symptomatic infection and differential inoculum formation of V. dahliae on rotation crops presented here will be useful in designing rotations for management of Verticillium wilt.
Collapse
Affiliation(s)
- D L Wheeler
- Department of Plant Pathology, Washington State University, Pullman 99164-6430
| | - D A Johnson
- Department of Plant Pathology, Washington State University, Pullman 99164-6430
| |
Collapse
|
26
|
Żuraw A, Plog S, Lierz M, Gruber AD. No evidence of Sarcocystis calchasi involvement in mammalian meningoencephalitis of unknown origin. VETERINARY PARASITOLOGY- REGIONAL STUDIES AND REPORTS 2016; 3-4:49-52. [PMID: 31014499 DOI: 10.1016/j.vprsr.2016.05.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 04/19/2016] [Accepted: 05/16/2016] [Indexed: 10/21/2022]
Abstract
Sarcocystis calchasi has recently been identified as the cause of pigeon protozoal encephalitis, PPE, a lethal brain disease in pigeons and parrots. While only avian species have been identified so far to be susceptible to this pathogen as definitive or intermediate hosts, we speculated whether mammals may be susceptible as well, as in Sarcocystis neurona and other related apicomplexan parasites. Specifically, we hypothesized its involvement in mammalian meningoencephalitis of unknown origin, MUO. A total of 143 archived formalin fixed, paraffin embedded brain samples with MUO from dogs, cats, pigs, cattle, sheep, guinea pigs, horses, goats, mice, raccoon, ferret, hamster, mink and maned wolf were examined pathohistologically and by PCR for parasitic stages or DNA, respectively, of Sarcocystis calchasi or other apicomplexan parasites. All samples had non-suppurative, lymphoplasmacytic and/or granulomatous encephalitis or meningoencephalitis typical of MUO with many similarities to PPE in pigeons. However, neither parasitic structures nor DNA of Sarcocystis calchasi or other apicomplexan parasites were detected. It thus appears that, despite histological similarities between mammalian MUO and pigeon PPE and despite seemingly high prevalence of PPE and a persistent threat by Sarcocystis calchasi in pigeons, based on histopathology and PCR there is no evidence for a role of this parasite in MUO in mammals as intermediate or aberrant hosts.
Collapse
Affiliation(s)
- Aleksandra Żuraw
- Institute of Veterinary Pathology, Department of Veterinary Medicine, Freie Universität Berlin, Robert-von-Ostertag Str. 15, 14163 Berlin, Germany
| | - Stephanie Plog
- Institute of Veterinary Pathology, Department of Veterinary Medicine, Freie Universität Berlin, Robert-von-Ostertag Str. 15, 14163 Berlin, Germany
| | - Michael Lierz
- Institute of Veterinary Pathology, Department of Veterinary Medicine, Freie Universität Berlin, Robert-von-Ostertag Str. 15, 14163 Berlin, Germany
| | - Achim D Gruber
- Institute of Veterinary Pathology, Department of Veterinary Medicine, Freie Universität Berlin, Robert-von-Ostertag Str. 15, 14163 Berlin, Germany.
| |
Collapse
|
27
|
Appelgren A, McCoy KD, Richner H, Doligez B. Relative fitness of a generalist parasite on two alternative hosts: a cross-infestation experiment to test host specialization of the hen flea Ceratophyllus gallinae (Schrank). J Evol Biol 2016; 29:1091-101. [PMID: 26910399 DOI: 10.1111/jeb.12850] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 02/05/2016] [Accepted: 02/16/2016] [Indexed: 10/22/2022]
Abstract
Host range is a key element of a parasite's ecology and evolution and can vary greatly depending on spatial scale. Generalist parasites frequently show local population structure in relation to alternative sympatric hosts (i.e. host races) and may thus be specialists at local scales. Here, we investigated local population specialization of a common avian nest-based parasite, the hen flea Ceratophyllus gallinae (Schrank), exploiting two abundant host species that share the same breeding sites, the great tit Parus major (Linnaeus) and the collared flycatcher Ficedula albicollis (Temminck). We performed a cross-infestation experiment of fleas between the two host species in two distinct study areas during a single breeding season and recorded the reproductive success of both hosts and parasites. In the following year, hosts were monitored again to assess the long-term impact of cross-infestation. Our results partly support the local specialization hypothesis: in great tit nests, tit fleas caused higher damage to their hosts than flycatcher fleas, and in collared flycatcher nests, flycatcher fleas had a faster larval development rates than tit fleas. However, these results were significant in only one of the two studied areas, suggesting that the location and history of the host population can modulate the specialization process. Caution is therefore called for when interpreting single location studies. More generally, our results emphasize the need to explicitly account for host diversity in order to understand the population ecology and evolutionary trajectory of generalist parasites.
Collapse
Affiliation(s)
- A Appelgren
- CNRS, Université de Lyon, Université Lyon 1, Department of Biometry and Evolutionary Biology, Villeurbanne, France.,Evolutionary Ecology Lab, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.,MIVEGEC UMR 5290 CNRS-IRD-UM, Center IRD, Montpellier, France
| | - K D McCoy
- MIVEGEC UMR 5290 CNRS-IRD-UM, Center IRD, Montpellier, France
| | - H Richner
- Evolutionary Ecology Lab, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland
| | - B Doligez
- CNRS, Université de Lyon, Université Lyon 1, Department of Biometry and Evolutionary Biology, Villeurbanne, France.,Department of Ecology and Genetics/Animal Ecology, Evolutionary Biology Centre, University of Uppsala, Uppsala, Sweden
| |
Collapse
|
28
|
Croze M, Živković D, Stephan W, Hutter S. Balancing selection on immunity genes: review of the current literature and new analysis in Drosophila melanogaster. ZOOLOGY 2016; 119:322-9. [PMID: 27106015 DOI: 10.1016/j.zool.2016.03.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 02/11/2016] [Accepted: 03/16/2016] [Indexed: 12/18/2022]
Abstract
Balancing selection has been widely assumed to be an important evolutionary force, yet even today little is known about its abundance and its impact on the patterns of genetic diversity. Several studies have shown examples of balancing selection in humans, plants or parasites, and many genes under balancing selection are involved in immunity. It has been proposed that host-parasite coevolution is one of the main forces driving immune genes to evolve under balancing selection. In this paper, we review the literature on balancing selection on immunity genes in several organisms, including Drosophila. Furthermore, we performed a genome scan for balancing selection in an African population of Drosophila melanogaster using coalescent simulations of a demographic model with and without selection. We find very few genes under balancing selection and only one novel candidate gene related to immunity. Finally, we discuss the possible causes of the low number of genes under balancing selection.
Collapse
Affiliation(s)
- Myriam Croze
- Department of Biology II, Ludwig Maximilian University Munich, Großhaderner Str. 2, D-82152 Planegg-Martinsried, Germany.
| | - Daniel Živković
- Department of Biology II, Ludwig Maximilian University Munich, Großhaderner Str. 2, D-82152 Planegg-Martinsried, Germany
| | - Wolfgang Stephan
- Department of Biology II, Ludwig Maximilian University Munich, Großhaderner Str. 2, D-82152 Planegg-Martinsried, Germany
| | - Stephan Hutter
- Department of Biology II, Ludwig Maximilian University Munich, Großhaderner Str. 2, D-82152 Planegg-Martinsried, Germany
| |
Collapse
|
29
|
Rabajante JF, Tubay JM, Ito H, Uehara T, Kakishima S, Morita S, Yoshimura J, Ebert D. Host-parasite Red Queen dynamics with phase-locked rare genotypes. SCIENCE ADVANCES 2016; 2:e1501548. [PMID: 26973878 PMCID: PMC4783124 DOI: 10.1126/sciadv.1501548] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Accepted: 01/08/2016] [Indexed: 06/05/2023]
Abstract
Interactions between hosts and parasites have been hypothesized to cause winnerless coevolution, called Red Queen dynamics. The canonical Red Queen dynamics assume that all interacting genotypes of hosts and parasites undergo cyclic changes in abundance through negative frequency-dependent selection, which means that any genotype could become frequent at some stage. However, this prediction cannot explain why many rare genotypes stay rare in natural host-parasite systems. To investigate this, we build a mathematical model involving multihost and multiparasite genotypes. In a deterministic and controlled environment, Red Queen dynamics occur between two genotypes undergoing cyclic dominance changes, whereas the rest of the genotypes remain subordinate for long periods of time in phase-locked synchronized dynamics with low amplitude. However, introduction of stochastic noise in the model might allow the subordinate cyclic host and parasite types to replace dominant cyclic types as new players in the Red Queen dynamics. The factors that influence such evolutionary switching are interhost competition, specificity of parasitism, and degree of stochastic noise. Our model can explain, for the first time, the persistence of rare, hardly cycling genotypes in populations (for example, marine microbial communities) undergoing host-parasite coevolution.
Collapse
Affiliation(s)
- Jomar F. Rabajante
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
- Mathematics Division, Institute of Mathematical Sciences and Physics, University of the Philippines Los Baños, College, Laguna 4031, Philippines
| | - Jerrold M. Tubay
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
- Mathematics Division, Institute of Mathematical Sciences and Physics, University of the Philippines Los Baños, College, Laguna 4031, Philippines
| | - Hiromu Ito
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
| | - Takashi Uehara
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
- Department of Preschool Education, Nagoya College, Toyoake, Aichi 470-1193, Japan
| | - Satoshi Kakishima
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
| | - Satoru Morita
- Department of Mathematical and Systems Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
| | - Jin Yoshimura
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
- Department of Mathematical and Systems Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
- Marine Biosystems Research Center, Chiba University, Uchiura, Kamogawa, Chiba 299-5502, Japan
- Department of Environmental and Forest Biology, State University of New York College of Environmental Science and Forestry, Syracuse, NY 13210, USA
| | - Dieter Ebert
- Zoological Institute, University of Basel, Vesalgasse 1, Basel 4051, Switzerland
| |
Collapse
|
30
|
Nuismer SL, Dybdahl MF. Quantifying the coevolutionary potential of multistep immune defenses. Evolution 2016; 70:282-95. [DOI: 10.1111/evo.12863] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 12/15/2015] [Indexed: 12/18/2022]
Affiliation(s)
- Scott L. Nuismer
- Department of Biological Sciences; University of Idaho; Moscow Idaho 83844
| | - Mark F. Dybdahl
- School of Biological Sciences; Washington State University; Pullman Washington 99164
| |
Collapse
|
31
|
Metzger CMJA, Luijckx P, Bento G, Mariadassou M, Ebert D. The Red Queen lives: Epistasis between linked resistance loci. Evolution 2016; 70:480-7. [DOI: 10.1111/evo.12854] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 01/04/2016] [Accepted: 01/05/2016] [Indexed: 02/05/2023]
Affiliation(s)
| | - Pepijn Luijckx
- Zoological Institute; University of Basel; CH-4051 Basel Switzerland
- Department of Ecology & Evolutionary Biology; University of Toronto; M5S 3B2 Toronto Ontario Canada
| | - Gilberto Bento
- Zoological Institute; University of Basel; CH-4051 Basel Switzerland
| | - Mahendra Mariadassou
- Zoological Institute; University of Basel; CH-4051 Basel Switzerland
- INRA, UR1404 Unité Mathématique et Informatique Appliquées du Génome à l'Environnement; 78350 Jouy-en-Josas France
| | - Dieter Ebert
- Zoological Institute; University of Basel; CH-4051 Basel Switzerland
| |
Collapse
|
32
|
Ebert D, Duneau D, Hall MD, Luijckx P, Andras JP, Du Pasquier L, Ben-Ami F. A Population Biology Perspective on the Stepwise Infection Process of the Bacterial Pathogen Pasteuria ramosa in Daphnia. ADVANCES IN PARASITOLOGY 2015; 91:265-310. [PMID: 27015951 DOI: 10.1016/bs.apar.2015.10.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The infection process of many diseases can be divided into series of steps, each one required to successfully complete the parasite's life and transmission cycle. This approach often reveals that the complex phenomenon of infection is composed of a series of more simple mechanisms. Here we demonstrate that a population biology approach, which takes into consideration the natural genetic and environmental variation at each step, can greatly aid our understanding of the evolutionary processes shaping disease traits. We focus in this review on the biology of the bacterial parasite Pasteuria ramosa and its aquatic crustacean host Daphnia, a model system for the evolutionary ecology of infectious disease. Our analysis reveals tremendous differences in the degree to which the environment, host genetics, parasite genetics and their interactions contribute to the expression of disease traits at each of seven different steps. This allows us to predict which steps may respond most readily to selection and which steps are evolutionarily constrained by an absence of variation. We show that the ability of Pasteuria to attach to the host's cuticle (attachment step) stands out as being strongly influenced by the interaction of host and parasite genotypes, but not by environmental factors, making it the prime candidate for coevolutionary interactions. Furthermore, the stepwise approach helps us understanding the evolution of resistance, virulence and host ranges. The population biological approach introduced here is a versatile tool that can be easily transferred to other systems of infectious disease.
Collapse
Affiliation(s)
- Dieter Ebert
- Zoological Institute, University of Basel, Basel, Switzerland
| | - David Duneau
- Zoological Institute, University of Basel, Basel, Switzerland; Department Ecologie et Diversité Biologique, University Paul Sabatier-Toulouse III, Toulouse, France
| | - Matthew D Hall
- Zoological Institute, University of Basel, Basel, Switzerland; Monash University, School of Biological Sciences, Clayton Campus, Melbourne, VIC, Australia
| | - Pepijn Luijckx
- Zoological Institute, University of Basel, Basel, Switzerland; Department of Ecology & Evolutionary Biology, University of Toronto, Toronto, ON, Canada
| | - Jason P Andras
- Zoological Institute, University of Basel, Basel, Switzerland; Department of Biological Sciences, Mount Holyoke College, South Hadley, MA, USA
| | | | - Frida Ben-Ami
- Department of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv, Israel
| |
Collapse
|
33
|
Frankel VM, Hendry AP, Rolshausen G, Torchin ME. Host preference of an introduced ‘generalist’ parasite for a non-native host. Int J Parasitol 2015; 45:703-9. [DOI: 10.1016/j.ijpara.2015.03.012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 03/10/2015] [Accepted: 03/16/2015] [Indexed: 11/25/2022]
|
34
|
McTaggart SJ, Cézard T, Garbutt JS, Wilson PJ, Little TJ. Transcriptome profiling during a natural host-parasite interaction. BMC Genomics 2015; 16:643. [PMID: 26311167 PMCID: PMC4551569 DOI: 10.1186/s12864-015-1838-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 08/13/2015] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Infection outcome in some coevolving host-pathogens is characterised by host-pathogen genetic interactions, where particular host genotypes are susceptible only to a subset of pathogen genotypes. To identify candidate genes responsible for the infection status of the host, we exposed a Daphnia magna host genotype to two bacterial strains of Pasteuria ramosa, one of which results in infection, while the other does not. At three time points (four, eight and 12 h) post pathogen exposure, we sequenced the complete transcriptome of the hosts using RNA-Seq (Illumina). RESULTS We observed a rapid and transient response to pathogen treatment. Specifically, at the four-hour time point, eight genes were differentially expressed. At the eight-hour time point, a single gene was differentially expressed in the resistant combination only, and no genes were differentially expressed at the 12-h time point. CONCLUSIONS We found that pathogen-associated transcriptional activity is greatest soon after exposure. Genome-wide resistant combinations were more likely to show upregulation of genes, while susceptible combinations were more likely to be downregulated, relative to controls. Our results also provide several novel candidate genes that may play a pivotal role in determining infection outcomes.
Collapse
Affiliation(s)
- Seanna J McTaggart
- Institute of Evolutionary Biology, School of Biological Sciences, Ashworth Laboratories, University of Edinburgh, Edinburgh, EH9 3JT, UK.
| | - Timothée Cézard
- Edinburgh Genomics, Ashworth Laboratories, University of Edinburgh, Edinburgh, EH9 3JT, UK.
| | - Jennie S Garbutt
- Institute of Evolutionary Biology, School of Biological Sciences, Ashworth Laboratories, University of Edinburgh, Edinburgh, EH9 3JT, UK.
| | - Phil J Wilson
- Institute of Evolutionary Biology, School of Biological Sciences, Ashworth Laboratories, University of Edinburgh, Edinburgh, EH9 3JT, UK.
| | - Tom J Little
- Institute of Evolutionary Biology, School of Biological Sciences, Ashworth Laboratories, University of Edinburgh, Edinburgh, EH9 3JT, UK. .,Centre for Immunity, Infection and Evolution, School of Biological Sciences; Ashworth Laboratories, University of Edinburgh, Edinburgh, EH9 3JT, UK.
| |
Collapse
|
35
|
Rapid evolution of virulence leading to host extinction under host-parasite coevolution. BMC Evol Biol 2015; 15:112. [PMID: 26070343 PMCID: PMC4464865 DOI: 10.1186/s12862-015-0407-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 06/02/2015] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND Host-parasite coevolution is predicted to result in changes in the virulence of the parasite in order to maximise its reproductive success and transmission potential, either via direct host-to-host transfer or through the environment. The majority of coevolution experiments, however, do not allow for environmental transmission or persistence of long lived parasite stages, in spite of the fact that these may be critical for the evolutionary success of spore forming parasites under natural conditions. We carried out a coevolution experiment using the red flour beetle, Tribolium castaneum, and its natural microsporidian parasite, Paranosema whitei. Beetles and their environment, inclusive of spores released into it, were transferred from generation to generation. We additionally took a modelling approach to further assess the importance of transmissive parasite stages on virulence evolution. RESULTS In all parasite treatments of the experiment, coevolution resulted in extinction of the host population, with a pronounced increase in virulence being seen. Our modelling approach highlighted the presence of environmental transmissive parasite stages as being critical to the trajectory of virulence evolution in this system. CONCLUSIONS The extinction of host populations was unexpected, particularly as parasite virulence is often seen to decrease in host-parasite coevolution. This, in combination with the increase in virulence and results obtained from the model, suggest that the inclusion of transmissive parasite stages is important to improving our understanding of virulence evolution.
Collapse
|
36
|
Routtu J, Ebert D. Genetic architecture of resistance in Daphnia hosts against two species of host-specific parasites. Heredity (Edinb) 2014; 114:241-8. [PMID: 25335558 DOI: 10.1038/hdy.2014.97] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2014] [Revised: 08/21/2014] [Accepted: 08/27/2014] [Indexed: 02/04/2023] Open
Abstract
Understanding the genetic architecture of host resistance is key for understanding the evolution of host-parasite interactions. Evolutionary models often assume simple genetics based on few loci and strong epistasis. It is unknown, however, whether these assumptions apply to natural populations. Using a quantitative trait loci (QTL) approach, we explore the genetic architecture of resistance in the crustacean Daphnia magna to two of its natural parasites: the horizontally transmitted bacterium Pasteuria ramosa and the horizontally and vertically transmitted microsporidium Hamiltosporidium tvaerminnensis. These two systems have become models for studies on the evolution of host-parasite interactions. In the QTL panel used here, Daphnia's resistance to P. ramosa is controlled by a single major QTL (which explains 50% of the observed variation). Resistance to H. tvaerminnensis horizontal infections shows a signature of a quantitative trait based in multiple loci with weak epistatic interactions (together explaining 38% variation). Resistance to H. tvaerminnensis vertical infections, however, shows only one QTL (explaining 13.5% variance) that colocalizes with one of the QTLs for horizontal infections. QTLs for resistance to Pasteuria and Hamiltosporidium do not colocalize. We conclude that the genetics of resistance in D. magna are drastically different for these two parasites. Furthermore, we infer that based on these and earlier results, the mechanisms of coevolution differ strongly for the two host-parasite systems. Only the Pasteuria-Daphnia system is expected to follow the negative frequency-dependent selection (Red Queen) model. How coevolution works in the Hamiltosporidium-Daphnia system remains unclear.
Collapse
Affiliation(s)
- J Routtu
- Zoologisches Institut, Universität Basel, Basel, Switzerland
| | - D Ebert
- Zoologisches Institut, Universität Basel, Basel, Switzerland
| |
Collapse
|
37
|
Kodaman N, Sobota RS, Mera R, Schneider BG, Williams SM. Disrupted human-pathogen co-evolution: a model for disease. Front Genet 2014; 5:290. [PMID: 25202324 PMCID: PMC4142859 DOI: 10.3389/fgene.2014.00290] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Accepted: 08/05/2014] [Indexed: 02/06/2023] Open
Abstract
A major goal in infectious disease research is to identify the human and pathogenic genetic variants that explain differences in microbial pathogenesis. However, neither pathogenic strain nor human genetic variation in isolation has proven adequate to explain the heterogeneity of disease pathology. We suggest that disrupted co-evolution between a pathogen and its human host can explain variation in disease outcomes, and that genome-by-genome interactions should therefore be incorporated into genetic models of disease caused by infectious agents. Genetic epidemiological studies that fail to take both the pathogen and host into account can lead to false and misleading conclusions about disease etiology. We discuss our model in the context of three pathogens, Helicobacter pylori, Mycobacterium tuberculosis and human papillomavirus, and generalize the conditions under which it may be applicable.
Collapse
Affiliation(s)
- Nuri Kodaman
- Department of Genetics, Geisel School of Medicine, Dartmouth College Hanover, NH, USA ; Department of Molecular Physiology and Biophysics, Center for Human Genetics Research, Vanderbilt University Medical Center Nashville, TN, USA
| | - Rafal S Sobota
- Department of Genetics, Geisel School of Medicine, Dartmouth College Hanover, NH, USA ; Department of Molecular Physiology and Biophysics, Center for Human Genetics Research, Vanderbilt University Medical Center Nashville, TN, USA
| | - Robertino Mera
- Division of Gastroenterology, Department of Medicine, Vanderbilt University Medical Center Nashville, TN, USA
| | - Barbara G Schneider
- Division of Gastroenterology, Department of Medicine, Vanderbilt University Medical Center Nashville, TN, USA
| | - Scott M Williams
- Department of Genetics, Geisel School of Medicine, Dartmouth College Hanover, NH, USA
| |
Collapse
|
38
|
Dybdahl MF, Jenkins CE, Nuismer SL. Identifying the Molecular Basis of Host-Parasite Coevolution: Merging Models and Mechanisms. Am Nat 2014; 184:1-13. [DOI: 10.1086/676591] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
39
|
Heath KD, Nuismer SL. Connecting functional and statistical definitions of genotype by genotype interactions in coevolutionary studies. Front Genet 2014; 5:77. [PMID: 24782890 PMCID: PMC3990044 DOI: 10.3389/fgene.2014.00077] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Accepted: 03/24/2014] [Indexed: 12/22/2022] Open
Abstract
Predicting how species interactions evolve requires that we understand the mechanistic basis of coevolution, and thus the functional genotype-by-genotype interactions (G × G) that drive reciprocal natural selection. Theory on host-parasite coevolution provides testable hypotheses for empiricists, but depends upon models of functional G × G that remain loosely tethered to the molecular details of any particular system. In practice, reciprocal cross-infection studies are often used to partition the variation in infection or fitness in a population that is attributable to G × G (statistical G × G). Here we use simulations to demonstrate that within-population statistical G × G likely tells us little about the existence of coevolution, its strength, or the genetic basis of functional G × G. Combined with studies of multiple populations or points in time, mapping and molecular techniques can bridge the gap between natural variation and mechanistic models of coevolution, while model-based statistics can formally confront coevolutionary models with cross-infection data. Together these approaches provide a robust framework for inferring the infection genetics underlying statistical G × G, helping unravel the genetic basis of coevolution.
Collapse
Affiliation(s)
- Katy D Heath
- Department of Plant Biology, University of Illinois Urbana, IL, USA
| | - Scott L Nuismer
- Department of Biological Sciences, University of Idaho Moscow, ID, USA
| |
Collapse
|
40
|
Millanes AM, Truong C, Westberg M, Diederich P, Wedin M. Host switching promotes diversity in host-specialized mycoparasitic fungi: uncoupled evolution in the Biatoropsis-usnea system. Evolution 2014; 68:1576-93. [PMID: 24495034 DOI: 10.1111/evo.12374] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2013] [Accepted: 01/24/2014] [Indexed: 12/15/2022]
Abstract
Fungal mycoparasitism-fungi parasitizing other fungi-is a common lifestyle in some basal lineages of the basidiomycetes, particularly within the Tremellales. Relatively nonaggressive mycoparasitic fungi of this group are in general highly host specific, suggesting cospeciation as a plausible speciation mode in these associations. Species delimitation in the Tremellales is often challenging because morphological characters are scant. Host specificity is therefore a great aid to discriminate between species but appropriate species delimitation methods that account for actual diversity are needed to identify both specialist and generalist taxa and avoid inflating or underestimating diversity. We use the Biatoropsis-Usnea system to study factors inducing parasite diversification. We employ morphological, ecological, and molecular data-methods including genealogical concordance phylogenetic species recognition (GCPSR) and the general mixed Yule-coalescent (GMYC) model-to assess the diversity of fungi currently assigned to Biatoropsis usnearum. The degree of cospeciation in this association is assessed with two cophylogeny analysis tools (ParaFit and Jane 4.0). Biatoropsis constitutes a species complex formed by at least seven different independent lineages and host switching is a prominent force driving speciation, particularly in host specialists. Combining ITS and nLSU is recommended as barcode system in tremellalean fungi.
Collapse
Affiliation(s)
- Ana M Millanes
- Departamento de Biología y Geología, Universidad Rey Juan Carlos, E-28933 Móstoles, Spain.
| | | | | | | | | |
Collapse
|
41
|
Ashby B, Gupta S, Buckling A. Spatial structure mitigates fitness costs in host-parasite coevolution. Am Nat 2014; 183:E64-74. [PMID: 24561607 DOI: 10.1086/674826] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
The extent of population mixing is known to influence the coevolutionary outcomes of many host and parasite traits, including the evolution of generalism (the ability to resist or infect a broad range of genotypes). While the segregation of populations into interconnected demes has been shown to influence the evolution of generalism, the role of local interactions between individuals is unclear. Here, we combine an individual-based model of microbial communities with a well-established framework of genetic specificity that matches empirical observations of bacterium-phage interactions. We find the evolution of generalism in well-mixed populations to be highly sensitive to the severity of associated fitness costs, but the constraining effect of costs on the evolution of generalism is lessened in spatially structured populations. The contrasting outcomes between the two environments can be explained by different scales of competition (i.e., global vs. local). These findings suggest that local interactions may have important effects on the evolution of generalism in host-parasite interactions, particularly in the presence of high fitness costs.
Collapse
Affiliation(s)
- Ben Ashby
- Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, United Kingdom
| | | | | |
Collapse
|
42
|
Jansen M, Vergauwen L, Vandenbrouck T, Knapen D, Dom N, Spanier KI, Cielen A, De Meester L. Gene expression profiling of three different stressors in the water flea Daphnia magna. ECOTOXICOLOGY (LONDON, ENGLAND) 2013; 22:900-914. [PMID: 23564370 DOI: 10.1007/s10646-013-1072-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/29/2013] [Indexed: 06/02/2023]
Abstract
Microarrays are an ideal tool to screen for differences in gene expression of thousands of genes simultaneously. However, often commercial arrays are not available. In this study, we performed microarray analyses to evaluate patterns of gene transcription following exposure to two natural and one anthropogenic stressor. cDNA microarrays compiled of three life stage specific and three stressor-specific EST libraries, yielding 1734 different EST sequences, were used. We exposed juveniles of the water flea Daphnia magna for 48, 96 and 144 h to three stressors known to exert strong selection in natural populations of this species i.e. a sublethal concentration of the pesticide carbaryl, infective spores of the endoparasite Pasteuria ramosa, and fish predation risk mimicked by exposure to fish kairomones. A total of 148 gene fragments were differentially expressed compared to the control. Based on a PCA, the exposure treatments were separated into two main groups based on the extent of the transcriptional response: a low and a high (144 h of fish or carbaryl exposure and 96 h of parasite exposure) stress group. Firstly, we observed a general stress-related transcriptional expression profile independent of the treatment characterized by repression of transcripts involved in transcription, translation, signal transduction and energy metabolism. Secondly, we observed treatment-specific responses including signs of migration to deeper water layers in response to fish predation, structural challenge of the cuticle in response to carbaryl exposure, and disturbance of the ATP production in parasite exposure. A third important conclusion is that transcription expression patterns exhibit stress-specific changes over time. Parasite exposure shows the most differentially expressed gene fragments after 96 h. The peak of differentially expressed transcripts came only after 144 h of fish exposure, while carbaryl exposure induced a more stable number of differently expressed gene fragments over time.
Collapse
Affiliation(s)
- Mieke Jansen
- Laboratory of Aquatic Ecology, Evolution and Conservation, Catholic University of Leuven, Charles Deberiotstraat 32, 3000 Leuven, Belgium.
| | | | | | | | | | | | | | | |
Collapse
|
43
|
A Matching-Allele Model Explains Host Resistance to Parasites. Curr Biol 2013; 23:1085-8. [DOI: 10.1016/j.cub.2013.04.064] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Revised: 04/02/2013] [Accepted: 04/24/2013] [Indexed: 11/20/2022]
|
44
|
Kubinak JL, Potts WK. Host resistance influences patterns of experimental viral adaptation and virulence evolution. Virulence 2013; 4:410-8. [PMID: 23645287 DOI: 10.4161/viru.24724] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Infectious diseases are major threats to all living systems, so understanding the forces of selection that limit the evolution of more virulent pathogens is of fundamental importance; this includes the practical application of identifying possible mitigation strategies for at-risk host populations. The evolution of more virulent pathogens has been classically understood to be limited by the tradeoff between within-host growth rate and transmissibility. Importantly, heterogeneity among hosts can influence both of these factors. However, despite our substantial understanding of how the immune system operates to control pathogen replication during infection, we have only a limited appreciation of how variability in intrinsic (i.e., genetically determined) levels of host resistance influences patterns of pathogen adaptation and virulence evolution. Here, we describe results from experimental evolution studies using a model host-pathogen (virus-mammal) system; we demonstrate that variability in intrinsic levels of resistance among host genotypes can have significant effects on patterns of pathogen adaptation and virulence evolution during serial passage. Both the magnitude of adaptive response as well as the degree of pathogen specialization was positively correlated with host resistance, while mean overall virulence of post-passage virus was negatively correlated with host resistance. These results are consistent with a model whereby resistant host genotypes impose stronger selection on adapting pathogen populations, which in turn leads to the evolution of more specialized pathogen variants whose overall (i.e., mean) virulence across host genotypes is reduced.
Collapse
Affiliation(s)
- Jason L Kubinak
- Division of Microbiology and Immunology, Department of Pathology; School of Medicine, University of Utah; Salt Lake City, UT USA.
| | | |
Collapse
|
45
|
Langford GJ, Janovy J. Host Specificity of North AmericanRhabdiasspp. (Nematoda: Rhabdiasidae): Combining Field Data and Experimental Infections with a Molecular Phylogeny. J Parasitol 2013; 99:277-86. [DOI: 10.1645/ge-3217.1] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
46
|
de Vienne DM, Refrégier G, López-Villavicencio M, Tellier A, Hood ME, Giraud T. Cospeciation vs host-shift speciation: methods for testing, evidence from natural associations and relation to coevolution. THE NEW PHYTOLOGIST 2013; 198:347-385. [PMID: 23437795 DOI: 10.1111/nph.12150] [Citation(s) in RCA: 259] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Accepted: 12/19/2012] [Indexed: 05/26/2023]
Abstract
Hosts and their symbionts are involved in intimate physiological and ecological interactions. The impact of these interactions on the evolution of each partner depends on the time-scale considered. Short-term dynamics - 'coevolution' in the narrow sense - has been reviewed elsewhere. We focus here on the long-term evolutionary dynamics of cospeciation and speciation following host shifts. Whether hosts and their symbionts speciate in parallel, by cospeciation, or through host shifts, is a key issue in host-symbiont evolution. In this review, we first outline approaches to compare divergence between pairwise associated groups of species, their advantages and pitfalls. We then consider recent insights into the long-term evolution of host-parasite and host-mutualist associations by critically reviewing the literature. We show that convincing cases of cospeciation are rare (7%) and that cophylogenetic methods overestimate the occurrence of such events. Finally, we examine the relationships between short-term coevolutionary dynamics and long-term patterns of diversification in host-symbiont associations. We review theoretical and experimental studies showing that short-term dynamics can foster parasite specialization, but that these events can occur following host shifts and do not necessarily involve cospeciation. Overall, there is now substantial evidence to suggest that coevolutionary dynamics of hosts and parasites do not favor long-term cospeciation.
Collapse
Affiliation(s)
- D M de Vienne
- Centre for Genomic Regulation (CRG), Dr. Aiguader 88, 08003, Barcelona, Spain
- Universitat Pompeu Fabra (UPF), 08003, Barcelona, Spain
| | - G Refrégier
- Université Paris-Sud, Institut de Génétique et Microbiologie, UMR 8621, 91405, Orsay, France
- CNRS, UMR8621, 91405, Orsay, France
| | - M López-Villavicencio
- Muséum National d'Histoire Naturelle, 57 rue Cuvier, F-75231, Paris Cedex 05, France
| | - A Tellier
- Section of Population Genetics, Center of Life and Food Sciences Weihenstephan, Technische Universität München, D-85354, Freising, Germany
| | - M E Hood
- Department of Biology, Amherst College, Amherst, MA, USA
| | - T Giraud
- Université Paris-Sud, Ecologie, Systématique et Evolution, UMR 8079, 91405, Orsay, France
- CNRS, UMR8079, 91405, Orsay, France
| |
Collapse
|
47
|
Líznarová E, Sentenská L, García LF, Pekár S, Viera C. Local trophic specialisation in a cosmopolitan spider (Araneae). ZOOLOGY 2013. [DOI: 10.1016/j.zool.2012.06.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
48
|
Cisarovsky G, Schmid-Hempel P, Sadd BM. Robustness of the outcome of adult bumblebee infection with a trypanosome parasite after varied parasite exposures during larval development. J Evol Biol 2012; 25:1053-9. [PMID: 22487556 DOI: 10.1111/j.1420-9101.2012.02507.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The outcome of defence by the invertebrate immunity has recently been shown to be more complex than previously thought. In particular, the outcome is affected by biotic and abiotic environmental variation, host genotype, parasite genotype and their interaction. Knowledge of conditions under which environmental variation affects the outcome of an infection is one important question that relates to this complexity. We here use the model system of the bumblebee, Bombus terrestris, infected by the trypanosome, Crithidia bombi, combined with a split-colony design to test the influence of the parasite environment during larval rearing on adult resistance. We find that genotype-specific interactions are maintained and adult resistance is not influenced. This demonstrates that environmental dependence of bumblebee-trypanosome interactions is not ubiquitous, and yet unknown constraints will maintain standard coevolutionary dynamics under such environmental deviations.
Collapse
Affiliation(s)
- G Cisarovsky
- ETH Zürich, Institute of Integrative Biology, Universitätstrasse 16, Zürich, Switzerland.
| | | | | |
Collapse
|
49
|
Roth O, Keller I, Landis SH, Salzburger W, Reusch TB. HOSTS ARE AHEAD IN A MARINE HOST-PARASITE COEVOLUTIONARY ARMS RACE: INNATE IMMUNE SYSTEM ADAPTATION IN PIPEFISH SYNGNATHUS TYPHLE AGAINST VIBRIO PHYLOTYPES. Evolution 2012; 66:2528-39. [DOI: 10.1111/j.1558-5646.2012.01614.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
50
|
ARBIV A, KHOKHLOVA IS, OVADIA O, NOVOPLANSKY A, KRASNOV BR. Use it or lose it: reproductive implications of ecological specialization in a haematophagous ectoparasite. J Evol Biol 2012; 25:1140-8. [DOI: 10.1111/j.1420-9101.2012.02499.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
|