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https://www.readbyqxmd.com/read/28097419/modelling-wolbachia-infection-in-a-sex-structured-mosquito-population-carrying-west-nile-virus
#1
József Z Farkas, Stephen A Gourley, Rongsong Liu, Abdul-Aziz Yakubu
Wolbachia is possibly the most studied reproductive parasite of arthropod species. It appears to be a promising candidate for biocontrol of some mosquito borne diseases. We begin by developing a sex-structured model for a Wolbachia infected mosquito population. Our model incorporates the key effects of Wolbachia infection including cytoplasmic incompatibility and male killing. We also allow the possibility of reduced reproductive output, incomplete maternal transmission, and different mortality rates for uninfected/infected male/female individuals...
January 17, 2017: Journal of Mathematical Biology
https://www.readbyqxmd.com/read/28087534/mechanisms-of-horizontal-cell-to-cell-transfer-of-wolbachia-spp-in-drosophila-melanogaster
#2
Pamela M White, Jose E Pietri, Alain Debec, Shelbi Russell, Bhavin Patel, William Sullivan
: Wolbachia is an intracellular endosymbiont present in most arthropod and filarial nematode species. Transmission between hosts is primarily vertical, taking place exclusively through the female germline, though horizontal transmission has also been documented. Several studies indicate that Wolbachia is capable of transfer between somatic and germline cells during nematode development and in adult flies. However, the mechanisms underlying horizontal cell-to-cell transfer remain largely unexplored...
January 13, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28056065/wolbachia-infections-in-aedes-aegypti-differ-markedly-in-their-response-to-cyclical-heat-stress
#3
Perran A Ross, Itsanun Wiwatanaratanabutr, Jason K Axford, Vanessa L White, Nancy M Endersby-Harshman, Ary A Hoffmann
Aedes aegypti mosquitoes infected with Wolbachia bacteria are currently being released for arbovirus suppression around the world. Their potential to invade populations and persist will depend on interactions with environmental conditions, particularly as larvae are often exposed to fluctuating and extreme temperatures in the field. We reared Ae. aegypti larvae infected with different types of Wolbachia (wMel, wAlbB and wMelPop-CLA) under diurnal cyclical temperatures. Rearing wMel and wMelPop-CLA-infected larvae at 26-37°C reduced the expression of cytoplasmic incompatibility, a reproductive manipulation induced by Wolbachia...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28056021/comparison-of-doxycycline-minocycline-doxycycline-plus-albendazole-and-albendazole-alone-in-their-efficacy-against-onchocerciasis-in-a-randomized-open-label-pilot-trial
#4
Ute Klarmann-Schulz, Sabine Specht, Alexander Yaw Debrah, Linda Batsa, Nana Kwame Ayisi-Boateng, Jubin Osei-Mensah, Yusif Mubarik, Peter Konadu, Arcangelo Ricchiuto, Rolf Fimmers, Sandra Arriens, Bettina Dubben, Louise Ford, Mark Taylor, Achim Hoerauf
: The search for new macrofilaricidal drugs against onchocerciasis that can be administered in shorter regimens than required for doxycycline (DOX, 200mg/d given for 4-6 weeks), identified minocycline (MIN) with superior efficacy to DOX. Further reduction in the treatment regimen may be achieved with co-administration with standard anti-filarial drugs. Therefore a randomized, open-label, pilot trial was carried out in an area in Ghana endemic for onchocerciasis, comprising 5 different regimens: the standard regimen DOX 200mg/d for 4 weeks (DOX 4w, N = 33), the experimental regimens MIN 200mg/d for 3 weeks (MIN 3w; N = 30), DOX 200mg/d for 3 weeks plus albendazole (ALB) 800mg/d for 3 days (DOX 3w + ALB 3d, N = 32), DOX 200mg/d for 3 weeks (DOX 3w, N = 31) and ALB 800mg for 3 days (ALB 3d, N = 30)...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28052065/comparison-of-stable-and-transient-wolbachia-infection-models-in-aedes-aegypti-to-block-dengue-and-west-nile-viruses
#5
Dirk Albert Joubert, Scott L O'Neill
Pathogen replication and transmission in Wolbachia infected insects are currently studied using three Wolbachia infection systems: naturally infected Wolbachia hosts, hosts transinfected with Wolbachia (stably maintained and inherited infections) and hosts transiently infected with Wolbachia. All three systems have been used to test the effect of Wolbachia on mosquito transmitted pathogens such as dengue virus (DENV), West Nile virus (WNV) and Plasmodium. From these studies it is becoming increasingly clear that the interaction between a particular pathogen and Wolbachia is heavily influenced by the host-Wolbachia interaction and the model of infection...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28049921/in-vitro-canine-platelet-aggregation-caused-by-dirofilaria-immitis-extract
#6
Yasuhiro Takashima, Isako Onoda, Shin-Pin Chiou, Katsuya Kitoh
Platelet function hyper-activity has been reported in Dirofilaria immitis (heartworm, HW)-infected dogs. Although the mechanism of increased platelet hyper-activity has not yet been elucidated, it is suggested to be mediated by unknown factors, which may be related to adult HW components. This study aims to determine whether adult male HW whole body extract induces canine platelet aggregation in vitro. The results indicate that HW extract caused an aggregation of canine platelets in a concentration-dependent manner...
December 30, 2016: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/28049478/the-transcriptome-of-the-mosquito-aedes-fluviatilis-diptera-culicidae-and-transcriptional-changes-associated-with-its-native-wolbachia-infection
#7
E P Caragata, F S Pais, L A Baton, J B L Silva, M H F Sorgine, L A Moreira
BACKGROUND: Wolbachia is a bacterial endosymbiont that naturally infects a wide range of insect species, and causes drastic changes to host biology. Stable infections of Wolbachia in mosquitoes can inhibit infection with medically important pathogens such as dengue virus and malaria-causing Plasmodium parasites. However, some native Wolbachia strains can enhance infection with certain pathogens, as is the case for the mosquito Aedes fluviatilis, where infection with Plasmodium gallinaceum is enhanced by the native wFlu Wolbachia strain...
January 3, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28032096/serological-and-molecular-detection-of-dirofilaria-species-in-stray-dogs-and-investigation-of-wolbachia-dna-by-pcr-in-turkey
#8
Sami Simsek, Ayse Turkan Ciftci
BACKGROUND: Dirofilaria immitis and Dirofilaria repens are the most common species of filarial nematodes described in the dogs. A single-step multiplex PCR was applied to detect and differentiate simultaneously and unequivocally D. immitis and D. repens on DNA extracted from canine peripheral blood and besides to detect the seroprevalance of D. immitis by ELISA in Elazig Province, Turkey. A PCR detection of the Wolbachia, which plays an important role in D. immitis biology and contributes to the inflammatory pathology of the heartworm, was also applied for the first time in Turkey...
December 2016: Journal of Arthropod-borne Diseases
https://www.readbyqxmd.com/read/28028309/symbiosis-new-horizons-for-wolbachia
#9
Ursula Hofer
No abstract text is available yet for this article.
December 28, 2016: Nature Reviews. Microbiology
https://www.readbyqxmd.com/read/28028089/wolbachia-in-parasitoids-attacking-native-european-and-introduced-eastern-cherry-fruit-flies-in-europe
#10
Hannes Schuler, Peter Kern, Wolfgang Arthofer, Heidrun Vogt, Maximilian Fischer, Christian Stauffer, Markus Riegler
The eastern cherry fruit fly, Rhagoletis cingulata Loew (Diptera: Tephritidae), is an economically important pest of cherries in North America. In 1983 it was first reported in Europe where it shares its ecological niche with the native European cherry fruit fly, Rhagoletis cerasi L. (Diptera: Tephritidae). Their coexistence in Europe led to the recent horizontal transmission of the Wolbachia strain wCer1 from R. cerasi to R. cingulata Horizontal Wolbachia transmission is mediated by either sharing of ecological niches or by interacting species such as parasitoids...
December 2016: Environmental Entomology
https://www.readbyqxmd.com/read/28026036/the-re-emerging-arboviral-threat-hidden-enemies-the-emergence-of-obscure-arboviral-diseases-and-the-potential-use-of-wolbachia-in-their-control
#11
Heverton Leandro Carneiro Dutra, Eric Pearce Caragata, Luciano Andrade Moreira
Mayaro, Oropouche, and O'Nyong-Nyong share many traits with more prominent arboviruses, like dengue and yellow fever, chikungunya, and Zika. These include severe clinical symptoms, multiple animal hosts, and widespread vector species living in close proximity to human habitats, all of which constitute significant risk factors for more frequent outbreaks in the future, greatly increasing the potential of these hidden enemies to follow Zika and become the next wave of global arboviral threats. Critically, the current dearth of knowledge on these arboviruses might impede the success of future control efforts, including the potential application of Wolbachia pipientis...
December 27, 2016: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
https://www.readbyqxmd.com/read/28009851/artificial-diets-for-mosquitoes
#12
REVIEW
Kristina K Gonzales, Immo A Hansen
Mosquito-borne diseases are responsible for more than a million human deaths every year. Modern mosquito control strategies such as sterile insect technique (SIT), release of insects carrying a dominant lethal (RIDL), population replacement strategies (PR), and Wolbachia-based strategies require the rearing of large numbers of mosquitoes in culture for continuous release over an extended period of time. Anautogenous mosquitoes require essential nutrients for egg production, which they obtain through the acquisition and digestion of a protein-rich blood meal...
December 21, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28005061/comparative-genomics-provides-a-timeframe-for-wolbachia-evolution-and-exposes-a-recent-biotin-synthesis-operon-transfer
#13
Michael Gerth, Christoph Bleidorn
The genus Wolbachia (Alphaproteobacteria) comprises the most abundant inherited intracellular bacteria(1). Despite their relevance as manipulators of human pathogen transmission(2) and arthropod reproduction(3), many aspects of their evolutionary history are not well understood(4). In arthropods, Wolbachia infections are typically transient on evolutionary timescales(5,6) and co-divergence between hosts and Wolbachia is supposedly rare. Consequently, much of our knowledge of Wolbachia genome evolution derives from very recently diverged strains, and a timescale for Wolbachia is lacking...
December 22, 2016: Nature Microbiology
https://www.readbyqxmd.com/read/28004792/nod2-dependent-neutrophil-recruitment-is-required-for-early-protective-immune-responses-against-infectious-litomosoides-sigmodontis-l3-larvae
#14
Jesuthas Ajendra, Sabine Specht, Sebastian Ziewer, Andrea Schiefer, Kenneth Pfarr, Marijo Parčina, Thomas A Kufer, Achim Hoerauf, Marc P Hübner
Nucleotide-binding oligomerization domain-containing protein 2 (NOD2) recognizes muramyl dipeptide (MDP) of bacterial cell walls, triggering NFκB-induced pro-inflammation. As most human pathogenic filariae contain Wolbachia endobacteria that synthesize the MDP-containing cell wall precursor lipid II, NOD2's role during infection with the rodent filaria Litomosoides sigmodontis was investigated. In NFκB reporter-cells, worm-extract containing Wolbachia induced NOD2 and NOD1. NOD2-deficient mice infected with L...
December 22, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27988830/wolbachia-infections-responsible-for-thelytoky-in-dryinid-wasps-the-case-of-gonatopus-bonaerensis-virla-hymenoptera-dryinidae
#15
M S Espinosa, E G Virla, S Cuozzo
We studied the occurrence of Wolbachia in the parasitoid Gonatopus bonaerensis Virla (Hymenoptera: Dryinidae). In order to verify the existence of natural infections in the parasitoid, a field survey was conducted. Identification of Wolbachia was performed on the basis of 16S rDNA, wsp_F1, and wsp_R1-sequences. After the detection of the bacteria, infected specimens of G. bonaerensis were treated with a solution of tetracycline. In Tucumán, parasitoids hold Wolbachia endosymbiont, which seems to control the wasp's reproduction in the nature turning it into thelytokous...
December 17, 2016: Neotropical Entomology
https://www.readbyqxmd.com/read/27982076/establishment-of-the-cytoplasmic-incompatibility-inducing-wolbachia-strain-wmel-in-an-important-agricultural-pest-insect
#16
Xiao-Fei Zhou, Zheng-Xi Li
The wMel Wolbachia strain was known for cytoplasmic incompatibility (CI)-induction and blocking the transmission of dengue. However, it is unknown whether it can establish and induce CI in a non-dipteran host insect. Here we artificially transferred wMel from Drosophila melanogaster into the whitefly Bemisia tabaci. Fluorescence in situ hybridisation demonstrated that wMel had successfully transfected the new host. Reciprocal crossing was conducted with wMel-transfected and wild-type isofemale lines, indicating that wMel could induce a strong CI without imposing significant cost on host fecundity...
December 16, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27973604/bacterial-communities-differ-among-drosophila-melanogaster-populations-and-affect-host-resistance-against-parasitoids
#17
Mariia Chaplinska, Sylvia Gerritsma, Francisco Dini-Andreote, Joana Falcao Salles, Bregje Wertheim
In Drosophila, diet is considered a prominent factor shaping the associated bacterial community. However, the host population background (e.g. genotype, geographical origin and founder effects) is a factor that may also exert a significant influence and is often overlooked. To test for population background effects, we characterized the bacterial communities in larvae of six genetically differentiated and geographically distant D. melanogaster lines collected from natural populations across Europe. The diet for these six lines had been identical for ca...
2016: PloS One
https://www.readbyqxmd.com/read/27966221/determination-of-the-microbial-community-features-of-haemaphysalis-flava-in-different-developmental-stages-by-high-throughput-sequencing
#18
Deyong Duan, Tianyin Cheng
In this study, we analyzed the in vivo microbial community structure and diversity differences of Haemaphysalis flava (H. flava) in four developmental stages (egg, larva, nymph, and adult) to determine which bacterial genera could be propagated through transovarial transmission and transmitted by transstadial transmission during different developmental stages of H. flava. Paired-end sequencing of the V3 region of the 16S ribosomal DNA (16S rDNA) of H. flava in four developmental stage samples was conducted using the Illumina MiSeq sequencing platform...
December 14, 2016: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/27965627/bacteriophage-wo-can-mediate-horizontal-gene-transfer-in-endosymbiotic-wolbachia-genomes
#19
Guan H Wang, Bao F Sun, Tuan L Xiong, Yan K Wang, Kristen E Murfin, Jin H Xiao, Da W Huang
Phage-mediated horizontal gene transfer (HGT) is common in free-living bacteria, and many transferred genes can play a significant role in their new bacterial hosts. However, there are few reports concerning phage-mediated HGT in endosymbionts (obligate intracellular bacteria within animal or plant hosts), such as Wolbachia. The Wolbachia-infecting temperate phage WO can actively shift among Wolbachia genomes and has the potential to mediate HGT between Wolbachia strains. In the present study, we extend previous findings by validating that the phage WO can mediate transfer of non-phage genes...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27935594/plant-mediated-horizontal-transmission-of-wolbachia-between-whiteflies
#20
Shao-Jian Li, Muhammad Z Ahmed, Ning Lv, Pei-Qiong Shi, Xing-Min Wang, Ji-Lei Huang, Bao-Li Qiu
Maternal transmission is the main transmission pathway of facultative bacterial endosymbionts, but phylogenetically distant insect hosts harbor closely related endosymbionts, suggesting that horizontal transmission occurs in nature. Here we report the first case of plant-mediated horizontal transmission of Wolbachia between infected and uninfected Bemisia tabaci AsiaII7 whiteflies. After infected whiteflies fed on cotton leaves, Wolbachia was visualized, both in the phloem vessels and in some novel 'reservoir' spherules along the phloem by fluorescence in situ hybridization using Wolbachia-specific 16S rRNA probes and transmission electron microscopy...
December 9, 2016: ISME Journal
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