keyword
MENU ▼
Read by QxMD icon Read
search

bacterial symbionts

keyword
https://www.readbyqxmd.com/read/28646115/genome-analysis-of-endomicrobium-proavitum-suggests-loss-and-gain-of-relevant-functions-during-the-evolution-of-intracellular-symbionts
#1
Hao Zheng, Carsten Dietrich, Andreas Brune
Bacterial endosymbionts of eukaryotes show progressive genome erosion, but detailed investigations of the evolutionary processes involved in the transition to an intracellular lifestyle are generally hampered by the lack of extant free-living lineages. Here, we characterize the genome of the recently isolated, free-living Endomicrobium proavitum, the second member of the Elusimicrobia phylum brought into pure culture, and compare it to the closely related "Candidatus Endomicrobium trichonymphae" strain Rs-D17, a previously described but uncultured endosymbiont of termite gut flagellates...
June 23, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28642842/the-tick-microbiome-why-non-pathogenic-microorganisms-matter-in-tick-biology-and-pathogen-transmission
#2
REVIEW
Sarah I Bonnet, Florian Binetruy, Angelica M Hernández-Jarguín, Olivier Duron
Ticks are among the most important vectors of pathogens affecting humans and other animals worldwide. They do not only carry pathogens however, as a diverse group of commensal and symbiotic microorganisms are also present in ticks. Unlike pathogens, their biology and their effect on ticks remain largely unexplored, and are in fact often neglected. Nonetheless, they can confer multiple detrimental, neutral, or beneficial effects to their tick hosts, and can play various roles in fitness, nutritional adaptation, development, reproduction, defense against environmental stress, and immunity...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28640534/dynamics-of-transcriptomic-response-to-infection-by-the-nematode-heterorhabditis-bacteriophora-and-its-bacterial-symbiont-photorhabdus-temperata-in-heliothis-virescens-larvae
#3
R An, K S Suri, J L Jurat-Fuentes, P S Grewal
Entomopathogenic nematodes in the Heterorhabditis genus and their symbiotic Photorhabdus bacteria are important biocontrol agents of insect pests and models for the study of microbe-host interactions. In this work, we used larvae of the tobacco budworm (Heliothis virescens) as a model to study its defensive mechanisms against Heterorhabditis bacteriophora nematodes carrying symbiotic Photorhabdus temperata. We first determined time points of initial nematode entry and release of bacteria into the haemolymph to perform transcriptional analysis of insect gene expression during these steps in the infective process...
June 22, 2017: Insect Molecular Biology
https://www.readbyqxmd.com/read/28636152/dynamics-and-origin-of-cytokinins-involved-in-plant-manipulation-by-a-leaf-mining-insect
#4
Hui Zhang, Antoine Guiguet, Géraldine Dubreuil, Anna Kisiala, Peter Andreas, R J Neil Emery, Elisabeth Huguet, Mélanie Body, David Giron
Several herbivorous insects and plant-associated microorganisms control the phytohormonal balance, thus enabling them to successfully exploit the plant by inhibiting plant defences and withdrawing plant resources for their own benefit. The leaf-mining moth Phyllonorycter blancardella modifies the cytokinin (CK) profile of mined leaf-tissues, and the insect symbiotic bacteria Wolbachia is involved in the plant manipulation to the benefit of the insect host. To gain a deeper understanding into the possible origin and dynamics of CKs, we conducted an extensive characterization of CKs in larvae and in infected apple leaves...
June 21, 2017: Insect Science
https://www.readbyqxmd.com/read/28632769/combining-omics-and-microscopy-to-visualize-interactions-between-the-asian-citrus-psyllid-vector-and-the-huanglongbing-pathogen-candidatus-liberibacter-asiaticus-in-the-insect-gut
#5
Angela Kruse, Somayeh Fattah-Hosseini, Surya Saha, Richard Johnson, EricaRose Warwick, Kasie Sturgeon, Lukas Mueller, Michael J MacCoss, Robert G Shatters, Michelle Cilia Heck
Huanglongbing, or citrus greening disease, is an economically devastating bacterial disease of citrus. It is associated with infection by the gram-negative bacterium Candidatus Liberibacter asiaticus (CLas). CLas is transmitted by Diaphorina citri, the Asian citrus psyllid (ACP). For insect transmission to occur, CLas must be ingested during feeding on infected phloem sap and cross the gut barrier to gain entry into the insect vector. To investigate the effects of CLas exposure at the gut-pathogen interface, we performed RNAseq and mass spectrometry-based proteomics to analyze the transcriptome and proteome, respectively, of ACP gut tissue...
2017: PloS One
https://www.readbyqxmd.com/read/28623729/host-microbiota-interactions-in-caenorhabditis-elegans-and-their-significance
#6
REVIEW
Michael Shapira
As a useful genetic model, C. elegans can facilitate investigation of the genetic underpinnings of host-microbiota interactions. However, decades of feeding it with Escherichia coli left a gap in our understanding of its interactions with microbes, hindering such use. This is changing, with recent studies characterizing the gut microbiota of worms in their natural habitats, comparing them to those in their environment, and evaluating the significance of gut and environmental commensals. This work defined a shared core gut microbiota significantly influenced by host genetics, and unraveled bacterial contributions to life history traits...
June 14, 2017: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/28618183/effects-of-different-temperature-regimes-on-survival-of-diaphorina-citri-and-its-endosymbiotic-bacterial-communities
#7
Mubasher Hussain, Komivi Senyo Akutse, Keppanan Ravindran, Yongwen Lin, Bamisope Steve Bamisile, Muhammad Qasim, Chandra Kanta Dash, Liande Wang
The Asian citrus psyllid, Diaphorina citri, is a major pest of citrus and vector of citrus greening (huanglongbing) in Asian. In our field-collected psyllid samples, we discovered that Fuzhou (China) and Faisalabad (Pakistan), populations harbored an obligate primary endosymbiont Candidatus Carsonella (gen. nov.) with a single species, Candidatus Carsonella ruddii (sp. nov.), and a secondary endosymbiont, Wolbachia surface proteins (WSP) which are intracellular endosymbionts residing in the bacteriomes. Responses of these symbionts to different temperatures were examined and their host survival assessed...
June 15, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28618146/green-alder-alnus-viridis-encroachment-shapes-microbial-communities-in-subalpine-soils-and-impacts-its-bacterial-or-fungal-symbionts-differently
#8
G Schwob, M Roy, S Manzi, T Pommier, M P Fernandez
Since the mid twentieth-century, subalpine grasslands undergo a progressive encroachment by Alnus viridis shrubs. Thanks to its rapid vegetative reproduction, its nitrogen fixing symbiosis with Frankia and its ectomycorrhizal cohorts, green alders are vigorous colonizers that quickly form mosaic of alder patches that evolves into a close canopy shrub community. To better understand how alder encroachment might influence microbial communities in this successional sequence, symbiont distribution, microbial richness and community structure in both soils and nodules were analyzed at three successional stages: grassland, mosaic and forest...
June 15, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28611826/the-evolution-of-bacterial-genome-architecture
#9
REVIEW
Louis-Marie Bobay, Howard Ochman
The genome architecture of bacteria and eukaryotes evolves in opposite directions when subject to genetic drift, a difference that can be ascribed to the fact that bacteria exhibit a mutational bias that deletes superfluous sequences, whereas eukaryotes are biased toward large insertions. Expansion of eukaryotic genomes occurs through the addition of non-functional sequences, such as repetitive sequences and transposable elements, whereas variation in bacterial genome size is largely due to the acquisition and loss of functional accessory genes...
2017: Frontiers in Genetics
https://www.readbyqxmd.com/read/28611430/-candidatus-cochliophilus-cryoturris-coxiellaceae-a-symbiont-of-the-testate-amoeba-cochliopodium-minus
#10
Han-Fei Tsao, Ute Scheikl, Jean-Marie Volland, Martina Köhsler, Monika Bright, Julia Walochnik, Matthias Horn
Free-living amoebae are well known for their role in controlling microbial community composition through grazing, but some groups, namely Acanthamoeba species, also frequently serve as hosts for bacterial symbionts. Here we report the first identification of a bacterial symbiont in the testate amoeba Cochliopodium. The amoeba was isolated from a cooling tower water sample and identified as C. minus. Fluorescence in situ hybridization and transmission electron microscopy revealed intracellular symbionts located in vacuoles...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28609446/are-sex-ratio-distorting-endosymbionts-responsible-for-mating-system-variation-among-dance-flies-diptera-empidinae
#11
Rosalind L Murray, Elizabeth J Herridge, Rob W Ness, Luc F Bussière
Maternally inherited bacterial endosymbionts are common in many arthropod species. Some endosymbionts cause female-biased sex ratio distortion in their hosts that can result in profound changes to a host's mating behaviour and reproductive biology. Dance flies (Diptera: Empidinae) are well known for their unusual reproductive biology, including species with female-specific ornamentation and female-biased lek-like swarming behaviour. The cause of the repeated evolution of female ornaments in these flies remains unknown, but is probably associated with female-biased sex ratios in individual species...
2017: PloS One
https://www.readbyqxmd.com/read/28607058/host-secreted-antimicrobial-peptide-enforces-symbiotic-selectivity-in-medicago-truncatula
#12
Qi Wang, Shengming Yang, Jinge Liu, Kata Terecskei, Edit Ábrahám, Anikó Gombár, Ágota Domonkos, Attila Szűcs, Péter Körmöczi, Ting Wang, Lili Fodor, Linyong Mao, Zhangjun Fei, Éva Kondorosi, Péter Kaló, Attila Kereszt, Hongyan Zhu
Legumes engage in root nodule symbioses with nitrogen-fixing soil bacteria known as rhizobia. In nodule cells, bacteria are enclosed in membrane-bound vesicles called symbiosomes and differentiate into bacteroids that are capable of converting atmospheric nitrogen into ammonia. Bacteroid differentiation and prolonged intracellular survival are essential for development of functional nodules. However, in the Medicago truncatula-Sinorhizobium meliloti symbiosis, incompatibility between symbiotic partners frequently occurs, leading to the formation of infected nodules defective in nitrogen fixation (Fix(-))...
June 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28606944/cytonuclear-epistasis-controls-the-density-of-symbiont-wolbachia-pipientis-in-non-gonadal-tissues-of-mosquito-culex-quinquefasciatus
#13
Kevin J Emerson, Robert L Glaser
Wolbachia pipientis, a bacterial symbiont infecting arthropods and nematodes, is vertically transmitted through the female germline and manipulates its host's reproduction to favor infected females. Wolbachia also infects somatic tissues where it can cause non-reproductive phenotypes in its host, including resistance to viral pathogens. Wolbachia-mediated phenotypes are strongly associated with the density of Wolbachia in host tissues. Little is known, however, about how Wolbachia density is regulated in native or heterologous hosts...
June 12, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28593198/biphasic-metabolism-and-host-interaction-of-a-chlamydial-symbiont
#14
Lena König, Alexander Siegl, Thomas Penz, Susanne Haider, Cecilia Wentrup, Julia Polzin, Evelyne Mann, Stephan Schmitz-Esser, Daryl Domman, Matthias Horn
Chlamydiae are obligate intracellular bacteria comprising well-known human pathogens and ubiquitous symbionts of protists, which are characterized by a unique developmental cycle. Here we comprehensively analyzed gene expression dynamics of Protochlamydia amoebophila during infection of its Acanthamoeba host by RNA sequencing. This revealed a highly dynamic transcriptional landscape, where major transcriptional shifts are conserved among chlamydial symbionts and pathogens. Our data served to propose a time-resolved model for type III protein secretion during the developmental cycle, and we provide evidence for a biphasic metabolism of P...
May 2017: MSystems
https://www.readbyqxmd.com/read/28592678/the-route-of-infection-determines-wolbachia-antibacterial-protection-in-drosophila
#15
Vanika Gupta, Radhakrishnan B Vasanthakrishnan, Jonathon Siva-Jothy, Katy M Monteith, Sam P Brown, Pedro F Vale
Bacterial symbionts are widespread among metazoans and provide a range of beneficial functions. Wolbachia-mediated protection against viral infection has been extensively demonstrated in Drosophila. In mosquitoes that are artificially transinfected with Drosophila melanogaster Wolbachia (wMel), protection from both viral and bacterial infections has been demonstrated. However, no evidence for Wolbachia-mediated antibacterial protection has been demonstrated in Drosophila to date. Here, we show that the route of infection is key for Wolbachia-mediated antibacterial protection...
June 14, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28587661/symbionts-in-waiting-the-dynamics-of-incipient-endosymbiont-complementation-and-replacement-in-minimal-bacterial-communities-of-psyllids
#16
Jennifer L Morrow, Aidan A G Hall, Markus Riegler
BACKGROUND: Obligate bacterial primary (P-) endosymbionts that are maternally inherited and codiverge with hosts are widespread across insect lineages with nutritionally restricted diets. Secondary (S-) endosymbionts are mostly facultative, but in some hosts, they complement P-endosymbiont function and therefore become obligate. Phylogenetic evidence exists for host switching and replacement of S-endosymbionts. The community dynamics that precede endosymbiont replacement and complementation have been little studied across host species, yet they are fundamental to the evolution of endosymbiosis...
June 6, 2017: Microbiome
https://www.readbyqxmd.com/read/28584701/alien-vs-predator-bacterial-challenge-alters-coral-microbiomes-unless-controlled-by-halobacteriovorax-predators
#17
Rory M Welsh, Stephanie M Rosales, Jesse R Zaneveld, Jérôme P Payet, Ryan McMinds, Steven L Hubbs, Rebecca L Vega Thurber
Coral microbiomes are known to play important roles in organismal health, response to environmental stress, and resistance to disease. The coral microbiome contains diverse assemblages of resident bacteria, ranging from defensive and metabolic symbionts to opportunistic bacteria that may turn harmful in compromised hosts. However, little is known about how these bacterial interactions influence the mechanism and controls of overall structure, stability, and function of the microbiome. We sought to test how coral microbiome dynamics were affected by interactions between two bacteria: Vibrio coralliilyticus, a known temperature-dependent pathogen of some corals, and Halobacteriovorax, a unique bacterial predator of Vibrio and other gram-negative bacteria...
2017: PeerJ
https://www.readbyqxmd.com/read/28584301/high-resolution-profiling-of-coral-associated-bacterial-communities-using-full-length-16s-rrna-sequence-data-from-pacbio-smrt-sequencing-system
#18
Wirulda Pootakham, Wuttichai Mhuantong, Thippawan Yoocha, Lalita Putchim, Chutima Sonthirod, Chaiwat Naktang, Nalinee Thongtham, Sithichoke Tangphatsornruang
Coral reefs are a complex ecosystem consisting of coral animals and a vast array of associated symbionts including the dinoflagellate Symbiodinium, fungi, viruses and bacteria. Several studies have highlighted the importance of coral-associated bacteria and their fundamental roles in fitness and survival of the host animal. The scleractinian coral Porites lutea is one of the dominant reef-builders in the Indo-West Pacific. Currently, very little is known about the composition and structure of bacterial communities across P...
June 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28580630/the-midgut-microbiota-plays-an-essential-role-in-sand-fly-vector-competence-for-leishmania-major
#19
Isabelle Louradour, Carolina Cunha Monteiro, Ehud Inbar, Kashinath Ghosh, Richard Merkhofer, Phillip Lawyer, Andrea Paun, Margery Smelkinson, Nagila Secundino, Michael Lewis, Dinesh Erram, Ludek Zurek, David Sacks
For many arthropod vectors, the diverse bacteria and fungi that inhabit the gut can negatively impact pathogen colonization. Our attempts to exploit antibiotic treatment of colonized Phlebotomus duboscqi sand flies in order to improve their vector competency for Leishmania major resulted instead in flies that were refractory to the development of transmissible infections due to the inability of the parasite to survive and to colonize the anterior midgut with infective, metacyclic stage promastigotes. The parasite survival and development defect could be overcome by feeding the flies on different symbiont bacteria but not by feeding them on bacterial supernatants or replete medium...
June 5, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/28577575/identification-of-sympatric-cryptic-species-of-aedes-albopictus-subgroup-in-vietnam-new-perspectives-in-phylosymbiosis-of-insect-vector
#20
Guillaume Minard, Van Tran Van, Florence Hélène Tran, Christian Melaun, Sven Klimpel, Lisa Katharina Koch, Khanh Ly Huynh Kim, Trang Huynh Thi Thuy, Huu Tran Ngoc, Patrick Potier, Patrick Mavingui, Claire Valiente Moro
BACKGROUND: The Aedes (Stegomyia) albopictus subgroup includes 11 cryptic species of which Ae. albopictus is the most widely distributed. Its global expansion associated with a documented vector competence for several emerging arboviruses raise obvious concerns in the recently colonized regions. While several studies have provided important insights regarding medical importance of Ae. albopicus, the investigations of the other sibling species are scarce. In Asia, indigenous populations within the Ae...
June 2, 2017: Parasites & Vectors
keyword
keyword
63496
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"