keyword
MENU ▼
Read by QxMD icon Read
search

Within host evolution

keyword
https://www.readbyqxmd.com/read/28326078/inside-out-archaeal-ectosymbionts-suggest-a-second-model-of-reduced-genome-evolution
#1
REVIEW
Trevor Nicks, Lilah Rahn-Lee
Reduced-genome symbionts and their organelle counterparts, which have even smaller genomes, are essential to the lives of many organisms. But how and why have these genomes become so small? Endosymbiotic genome reduction is a product of isolation within the host, followed by massive pseudogenization and gene loss often including DNA repair mechanisms. This phenomenon can be observed in insect endosymbionts such as the bacteria Carsonella ruddii and Buchnera aphidicola. Yet endosymbionts are not the only organisms with reduced genomes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28325970/making-the-most-of-your-host-the-metrosideros-feeding-psyllids-hemiptera-psylloidea-of-the-hawaiian-islands
#2
Diana M Percy
The Hawaiian psyllids (Psylloidea, Triozidae) feeding on Metrosideros (Myrtaceae) constitute a remarkable radiation of more than 35 species. This monophyletic group has diversified on a single, highly polymorphic host plant species, Metrosideros polymorpha. Eleven Metrosideros-feeding species included in the Insects of Hawaii by Zimmerman are redescribed, and an additional 25 new species are described. Contrary to previous classifications that placed the Metrosideros-feeders in two genera, Trioza Foerster, 1848 and Kuwayama Crawford, 1911, all 36 named species are placed in Pariaconus Enderlein, 1926; and the relationship of this genus to other Pacific taxa within the family Triozidae, and other Austro-Pacific taxa feeding on host plants in Myrtaceae is clarified...
2017: ZooKeys
https://www.readbyqxmd.com/read/28322846/did-biogeographical-processes-shape-the-monogenean-community-of-butterflyfishes-in-the-tropical-indo-west-pacific-region
#3
M Reverter, T H Cribb, S C Cutmore, R A Bray, V Parravicini, P Sasal
Geographical distribution of parasite species can provide insights into the evolution and diversity of parasitic communities. Biogeography of marine parasites is poorly known, especially because it requires an understanding of host-parasite interactions, information that is rare, especially over large spatial scales. Here, we have studied the biogeographical patterns of dactylogyrid parasites of chaetodontids, one of the most well-studied fish families, in the tropical Indo-west Pacific region. Dactylogyrid parasites were collected from gills of 34 butterflyfish species (n = 560) at nine localities within an approximate area of 62 million km(2)...
March 17, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28322743/an-experimental-approach-to-the-immuno-modulatory-basis-of-host-parasite-local-adaptation-in-tapeworm-infected-sticklebacks
#4
Madeleine Hamley, Frederik Franke, Joachim Kurtz, Jörn Peter Scharsack
The evolutionary arms race of hosts and parasites often results in adaptations, which may differ between populations. Investigation of such local adaptation becomes increasingly important to understand dynamics of host-parasite interactions and co-evolution. To this end we performed an infection experiment involving pairs of three-spined sticklebacks and their tapeworm parasite Schistocephalus solidus from three geographically separated origins (Germany, Spain and Iceland) in a fully-crossed design for sympatric and allopatric host/parasite combinations...
March 18, 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28302859/inflammation-boosts-bacteriophage-transfer-between-salmonella-spp
#5
Médéric Diard, Erik Bakkeren, Jeffrey K Cornuault, Kathrin Moor, Annika Hausmann, Mikael E Sellin, Claude Loverdo, Abram Aertsen, Martin Ackermann, Marianne De Paepe, Emma Slack, Wolf-Dietrich Hardt
Bacteriophage transfer (lysogenic conversion) promotes bacterial virulence evolution. There is limited understanding of the factors that determine lysogenic conversion dynamics within infected hosts. A murine Salmonella Typhimurium (STm) diarrhea model was used to study the transfer of SopEΦ, a prophage from STm SL1344, to STm ATCC14028S. Gut inflammation and enteric disease triggered >55% lysogenic conversion of ATCC14028S within 3 days. Without inflammation, SopEΦ transfer was reduced by up to 10(5)-fold...
March 17, 2017: Science
https://www.readbyqxmd.com/read/28289263/fast-killing-parasites-can-be-favoured-in-spatially-structured-populations
#6
Helen C Leggett, Geoff Wild, Stuart A West, Angus Buckling
It is becoming increasingly clear that the evolution of infectious disease is influenced by host population structure. Theory predicts that parasites should be more 'prudent'-less transmissible-in spatially structured host populations. However, here we (i) highlight how low transmission, the phenotype being selected for in this in context, may also be achieved by rapacious host exploitation, if fast host exploitation confers a local, within-host competitive advantage and (ii) test this novel concept in a bacteria-virus system...
May 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28289262/uncertain-links-in-host-parasite-networks-lessons-for-parasite-transmission-in-a-multi-host-system
#7
Josephine G Walker, Michaela Plein, Eric R Morgan, Peter A Vesk
For many parasites, the full set of hosts that are susceptible to infection is not known, and this could lead to a bias in estimates of transmission. We used counts of individual adult parasites from historical parasitology studies in southern Africa to map a bipartite network of the nematode parasites of herbivore hosts that occur in Botswana. Bipartite networks are used in community ecology to represent interactions across trophic levels. We used a Bayesian hierarchical model to predict the full set of host-parasite interactions from existing data on parasitic gastrointestinal nematodes of wild and domestic ungulates given assumptions about the distribution of parasite counts within hosts, while accounting for the relative uncertainty of less sampled species...
May 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28289261/growth-rate-transmission-mode-and-virulence-in-human-pathogens
#8
Helen C Leggett, Charlie K Cornwallis, Angus Buckling, Stuart A West
The harm that pathogens cause to hosts during infection, termed virulence, varies across species from negligible to a high likelihood of rapid death. Classic theory for the evolution of virulence is based on a trade-off between pathogen growth, transmission and host survival, which predicts that higher within-host growth causes increased transmission and higher virulence. However, using data from 61 human pathogens, we found the opposite correlation to the expected positive correlation between pathogen growth rate and virulence...
May 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28289260/host-heterogeneity-affects-both-parasite-transmission-to-and-fitness-on-subsequent-hosts
#9
Jessica F Stephenson, Kyle A Young, Jordan Fox, Jukka Jokela, Joanne Cable, Sarah E Perkins
Infectious disease dynamics depend on the speed, number and fitness of parasites transmitting from infected hosts ('donors') to parasite-naive 'recipients'. Donor heterogeneity likely affects these three parameters, and may arise from variation between donors in traits including: (i) infection load, (ii) resistance, (iii) stage of infection, and (iv) previous experience of transmission. We used the Trinidadian guppy, Poecilia reticulata, and a directly transmitted monogenean ectoparasite, Gyrodactylus turnbulli, to experimentally explore how these sources of donor heterogeneity affect the three transmission parameters...
May 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28289259/who-acquires-infection-from-whom-and-how-disentangling-multi-host-and-multi-mode-transmission-dynamics-in-the-elimination-era
#10
REVIEW
Joanne P Webster, Anna Borlase, James W Rudge
Multi-host infectious agents challenge our abilities to understand, predict and manage disease dynamics. Within this, many infectious agents are also able to use, simultaneously or sequentially, multiple modes of transmission. Furthermore, the relative importance of different host species and modes can itself be dynamic, with potential for switches and shifts in host range and/or transmission mode in response to changing selective pressures, such as those imposed by disease control interventions. The epidemiology of such multi-host, multi-mode infectious agents thereby can involve a multi-faceted community of definitive and intermediate/secondary hosts or vectors, often together with infectious stages in the environment, all of which may represent potential targets, as well as specific challenges, particularly where disease elimination is proposed...
May 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28289257/host-allometry-influences-the-evolution-of-parasite-host-generalism-theory-and-meta-analysis
#11
Josephine G Walker, Amy Hurford, Jo Cable, Amy R Ellison, Stephen J Price, Clayton E Cressler
Parasites vary widely in the diversity of hosts they infect: some parasite species are specialists-infecting just a single host species, while others are generalists, capable of infecting many. Understanding the factors that drive parasite host-generalism is of basic biological interest, but also directly relevant to predicting disease emergence in new host species, identifying parasites that are likely to have unidentified additional hosts, and assessing transmission risk. Here, we use mathematical models to investigate how variation in host body size and environmental temperature affect the evolution of parasite host-generalism...
May 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28285908/are-cdi-systems-multicolored-facultative-helping-greenbeards
#12
REVIEW
Elizabeth S Danka, Erin C Garcia, Peggy A Cotter
Competitive and cooperative interactions between organisms, including bacteria, can significantly impact the composition of a community and the fitness of its members, as well as the fitness of their hosts when communities are living on or within other organisms. Understanding the underlying mechanisms is critical to the development of strategies to control microbiological communities that impact animal and plant health and also for understanding the evolution of social behaviors, which has been challenging for evolutionary biologists...
March 9, 2017: Trends in Microbiology
https://www.readbyqxmd.com/read/28282867/virus-resistance-is-not-costly-in-a-marine-alga-evolving-under-multiple-environmental-stressors
#13
Sarah E Heath, Kirsten Knox, Pedro F Vale, Sinead Collins
Viruses are important evolutionary drivers of host ecology and evolution. The marine picoplankton Ostreococcus tauri has three known resistance types that arise in response to infection with the Phycodnavirus OtV5: susceptible cells (S) that lyse following viral entry and replication; resistant cells (R) that are refractory to viral entry; and resistant producers (RP) that do not all lyse but maintain some viruses within the population. To test for evolutionary costs of maintaining antiviral resistance, we examined whether O...
March 8, 2017: Viruses
https://www.readbyqxmd.com/read/28279151/168-million-years-old-marine-lice-and-the-evolution-of-parasitism-within-isopods
#14
Christina Nagler, Matúš Hyžný, Joachim T Haug
BACKGROUND: Isopods (woodlice, slaters and their relatives) are common crustaceans and abundant in numerous habitats. They employ a variety of lifestyles including free-living scavengers and predators but also obligate parasites. This modern-day variability of lifestyles is not reflected in isopod fossils so far, mostly as the life habits of many fossil isopods are still unclear. A rather common group of fossil isopods is Urda (190-100 million years). Although some of the specimens of different species of Urda are considered well preserved, crucial characters for the interpretation of their lifestyle (and also of their phylogenetic position), have so far not been accessible...
March 9, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28277932/trans-kingdom-small-rna-transfer-during-host-pathogen-interactions-the-case-of-p-falciparum-and-erythrocytes
#15
Katelyn A Walzer, Jen-Tsan Chi
This review focuses on the role of trans-kingdom movement of small RNA (sRNA) molecules between parasites, particularly Plasmodium falciparum, and their respective host cells. While the intercellular transfer of sRNAs within organisms is well recognized, recent studies illustrate many examples of trans-kingdom sRNA exchange within the context of host-parasite interactions. These interactions are predominantly found in the transfer of host sRNAs between erythrocytes and the invading P. falciparum, as well as other host cell types...
February 17, 2017: RNA Biology
https://www.readbyqxmd.com/read/28274285/intra-and-interspecific-genetic-diversity-of-new-zealand-hairworms-nematomorpha
#16
Zachary J C Tobias, Arun K Yadav, Andreas Schmidt-Rhaesa, Robert Poulin
Hairworms (Nematomorpha) are a little-known group of parasites, and despite having been represented in the taxonomic literature for over a century, the implementation of molecular genetics in studies of hairworm ecology and evolution lags behind that of other parasitic taxa. In this study, we characterize the genetic diversity of the New Zealand nematomorph fauna and test for genetic structure within the most widespread species found. We provide new mitochondrial and nuclear ribosomal sequence data for three previously described species from New Zealand: Gordius paranensis, Parachordodes diblastus and Euchordodes nigromaculatus...
March 9, 2017: Parasitology
https://www.readbyqxmd.com/read/28267758/whole-genome-analysis-of-mycobacteria-from-birds-at-the-san-diego-zoo
#17
Wayne Pfeiffer, Josephine Braun, Jennifer Burchell, Carmel L Witte, Bruce A Rideout
METHODS: Mycobacteria isolated from more than 100 birds diagnosed with avian mycobacteriosis at the San Diego Zoo and its Safari Park were cultured postmortem and had their whole genomes sequenced. Computational workflows were developed and applied to identify the mycobacterial species in each DNA sample, to find single-nucleotide polymorphisms (SNPs) between samples of the same species, to further differentiate SNPs between as many as three different genotypes within a single sample, and to identify which samples are closely clustered genomically...
2017: PloS One
https://www.readbyqxmd.com/read/28258140/ecological-and-evolutionary-insights-into-pathovar-diversity-of-xanthomonas-citri
#18
Kanika Bansal, Samriti Midha, Sanjeet Kumar, Prabhu B Patil
Citrus canker, caused by Xanthomonas citri pv. citri (Xct), is a serious disease of citrus plants worldwide. Earlier phylogenetic studies using housekeeping genes revealed that Xct is related to many other pathovars, which can be collectively referred as Xanthomonas citri pathovars (XCPs). In the present study, we report the genome sequence of eighteen XCPs compared with four XCPs available in the public domain. In a tree based on phylogenomic marker genes, all the XCPs form a monophyletic cluster suggesting their origin from a common ancestor...
March 3, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28253898/assessment-of-contemporary-genetic-diversity-and-inter-taxa-inter-region-exchange-of-avian-paramyxovirus-serotype-1-in-wild-birds-sampled-in-north-america
#19
Andrew M Ramey, Iryna V Goraichuk, Joseph T Hicks, Kiril M Dimitrov, Rebecca L Poulson, David E Stallknecht, Justin Bahl, Claudio L Afonso
BACKGROUND: Avian paramyxovirus serotype 1 (APMV-1) viruses are globally distributed, infect wild, peridomestic, and domestic birds, and sometimes lead to outbreaks of disease. Thus, the maintenance, evolution, and spread of APMV-1 viruses are relevant to avian health. METHODS: In this study we sequenced the fusion gene from 58 APMV-1 isolates recovered from thirteen species of wild birds sampled throughout the USA during 2007-2014. We analyzed sequence information with previously reported data in order to assess contemporary genetic diversity and inter-taxa/inter-region exchange of APMV-1 in wild birds sampled in North America...
March 3, 2017: Virology Journal
https://www.readbyqxmd.com/read/28253846/digging-up-the-roots-of-an-insular-hotspot-of-genetic-diversity-decoupled-mito-nuclear-histories-in-the-evolution-of-the-corsican-sardinian-endemic-lizard-podarcis-tiliguerta
#20
Daniele Salvi, Catarina Pinho, D James Harris
BACKGROUND: Mediterranean islands host a disproportionately high level of biodiversity and endemisms. Growing phylogeographic evidence on island endemics has unveiled unexpectedly complex patterns of intra-island diversification, which originated at diverse spatial and temporal scales. We investigated multilocus genetic variation of the Corsican-Sardinian endemic lizard Podarcis tiliguerta with the aim of shedding more light on the evolutionary processes underlying the origin of Mediterranean island biodiversity...
March 2, 2017: BMC Evolutionary Biology
keyword
keyword
117452
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"