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Aedes aegypti

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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/28096902/functional-characterization-of-the-active-mutator-like-transposable-element-muta1-from-the-mosquito-aedes-aegypti
#2
Kun Liu, Susan R Wessler
BACKGROUND: Mutator-like transposable elements (MULEs) are widespread with members in fungi, plants, and animals. Most of the research on the MULE superfamily has focused on plant MULEs where they were discovered and where some are extremely active and have significant impact on genome structure. The maize MuDR element has been widely used as a tool for both forward and reverse genetic studies because of its high transposition rate and preference for targeting genic regions. However, despite being widespread, only a few active MULEs have been identified, and only one, the rice Os3378, has demonstrated activity in a non-host organism...
2017: Mobile DNA
https://www.readbyqxmd.com/read/28095875/assessment-of-synthetic-floral-based-attractants-and-sugar-baits-to-capture-male-and-female-aedes-aegypti-diptera-culicidae
#3
Kara Fikrig, Brian J Johnson, Durland Fish, Scott A Ritchie
BACKGROUND: The viruses transmitted by Aedes aegypti, including dengue and Zika viruses, are rapidly expanding in geographic range and as a threat to public health. In response, control programs are increasingly turning to the use of sterile insect techniques resulting in a need to trap male Ae. aegypti to monitor the efficacy of the intervention. However, there is a lack of effective and cheap methods for trapping males. Thus, we attempted to exploit the physiological need to obtain energy from sugar feeding in order to passively capture male and female Ae...
January 17, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28095414/mosquito-disseminated-insecticide-for-citywide-vector-control-and-its-potential-to-block-arbovirus-epidemics-entomological-observations-and-modeling-results-from-amazonian-brazil
#4
Fernando Abad-Franch, Elvira Zamora-Perea, Sérgio L B Luz
BACKGROUND: Mosquito-borne viruses threaten public health worldwide. When the ratio of competent vectors to susceptible humans is low enough, the virus's basic reproductive number (R0) falls below 1.0 (each case generating, on average, <1.0 additional case) and the infection fades out from the population. Conventional mosquito control tactics, however, seldom yield R0 < 1.0. A promising alternative uses mosquitoes to disseminate a potent growth-regulator larvicide, pyriproxyfen (PPF), to aquatic larval habitats; this kills most mosquito juveniles and substantially reduces adult mosquito emergence...
January 2017: PLoS Medicine
https://www.readbyqxmd.com/read/28095184/ecotoxicological-effects-of-larvicide-used-in-the-control-of-aedes-aegypti-on-nontarget-organisms-redefining-the-use-of-pyriproxyfen
#5
Vanessa Santana Vieira Santos, Evelyn Siqueira Caixeta, Edimar Olegário de Campos Júnior, Boscolli Barbosa Pereira
The continued widespread use of larvicides in Aedes aegypti control programs is still a necessary strategy, since there are no apparent efficient vaccines against arboviruses. However, chemical approaches may affect nontarget organisms and produce detrimental effects to environmental health. Therefore, the aim of this study was to conduct toxicity testing for pyriproxyfen at different concentrations using Daphnia magna and Artemia salina as model organisms to evaluate the ecotoxicological parameters. This study describes the toxicological effects of pyriproxyfen on both microcrustaceans, which are widely used in bioassays because of their sensitivity to changes in hydrosphere...
January 17, 2017: Journal of Toxicology and Environmental Health. Part A
https://www.readbyqxmd.com/read/28081143/engineered-aedes-aegypti-jak-stat-pathway-mediated-immunity-to-dengue-virus
#6
Natapong Jupatanakul, Shuzhen Sim, Yesseinia I Angleró-Rodríguez, Jayme Souza-Neto, Suchismita Das, Kristin E Poti, Shannan L Rossi, Nicholas Bergren, Nikos Vasilakis, George Dimopoulos
We have developed genetically modified Ae. aegypti mosquitoes that activate the conserved antiviral JAK/STAT pathway in the fat body tissue, by overexpressing either the receptor Dome or the Janus kinase Hop by the blood feeding-induced vitellogenin (Vg) promoter. Transgene expression inhibits infection with several dengue virus (DENV) serotypes in the midgut as well as systemically and in the salivary glands. The impact of the transgenes Dome and Hop on mosquito longevity was minimal, but it resulted in a compromised fecundity when compared to wild-type mosquitoes...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28077263/learning-in-mosquito-larvae-aedes-aegypti-habituation-to-a-visual-danger-signal
#7
Hugo Baglan, Claudio Lazzari, Fernando Guerrieri
In spite of the mosquito Aedes aegypti being a vector of several infectious diseases, a limited number of studies has been undertaken on learning in this species. Moreover, larval stages have been neglected as model organisms, although they are active, aquatic and perform stereotyped behavioural responses, e.g. the escape response when disturbed. To study the learning abilities of mosquito larvae, we focused on habituation, a form of non-associative learning widely studied in vertebrates and invertebrates. Habituation was defined as the progressive and reversible decrease in response to a reiterative stimulus...
January 7, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28075354/the-state-of-the-art-of-lethal-oviposition-trap-based-mass-interventions-for-arboviral-control
#8
Brian J Johnson, Scott A Ritchie, Dina M Fonseca
The intensifying expansion of arboviruses highlights the need for effective invasive Aedes control. While mass-trapping interventions have long been discredited as inefficient compared to insecticide applications, increasing levels of insecticide resistance, and the development of simple affordable traps that target and kill gravid female mosquitoes, show great promise. We summarize the methodologies and outcomes of recent lethal oviposition trap-based mass interventions for suppression of urban Aedes and their associated diseases...
January 8, 2017: Insects
https://www.readbyqxmd.com/read/28074023/emergence-of-epidemic-zika-virus-transmission-and-congenital-zika-syndrome-are-recently-evolved-traits-to-blame
#9
Scott C Weaver
The mechanisms responsible for the dramatic emergence of Zika virus (ZIKV), accompanied by congenital Zika syndrome and Guillain-Barré syndrome (GBS), remain unclear. However, two hypotheses are prominent: (i) evolution for enhanced urban transmission via adaptation to mosquito vectors, or for enhanced human infection to increase amplification, or (ii) the stochastic introduction of ZIKV into large, naive human populations in regions with abundant Aedes aegypti populations, leading to enough rare, severe infection outcomes for their first recognition...
January 10, 2017: MBio
https://www.readbyqxmd.com/read/28062794/larvicidal-and-growth-inhibitory-activity-of-entomopathogenic-bacteria-culture-fluids-against-aedes-aegypti-diptera-culicidae
#10
João Luiz Rosa da Silva, Fernanda Undurraga Schwalm, Carlos Eugênio Silva, Marisa da Costa, Ralf Heermann, Onilda Santos da Silva
Dengue, Chikungunya, and Zika are important vector-borne diseases, and Aedes aegypti L. is their main transmitter. As the disease management is mainly based on mosquito control strategies, the search for alternative and cost-effective approaches is ongoing. The Gram-negative bacteria Xenorhabdus nematophila and Photorhabdus luminescens are symbiotically associated with entomopathogenic nematodes and are highly pathogenic for insect larvae. After we have recently confirmed the toxicity of these bacteria in Ae...
January 6, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28060823/the-antiviral-rnai-response-in-vector-and-non-vector-cells-against-orthobunyaviruses
#11
Isabelle Dietrich, Xiaohong Shi, Melanie McFarlane, Mick Watson, Anne-Lie Blomström, Jessica K Skelton, Alain Kohl, Richard M Elliott, Esther Schnettler
BACKGROUND: Vector arthropods control arbovirus replication and spread through antiviral innate immune responses including RNA interference (RNAi) pathways. Arbovirus infections have been shown to induce the exogenous small interfering RNA (siRNA) and Piwi-interacting RNA (piRNA) pathways, but direct antiviral activity by these host responses in mosquito cells has only been demonstrated against a limited number of positive-strand RNA arboviruses. For bunyaviruses in general, the relative contribution of small RNA pathways in antiviral defences is unknown...
January 6, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28060822/transcriptome-sequencing-reveals-large-scale-changes-in-axenic-aedes-aegypti-larvae
#12
Kevin J Vogel, Luca Valzania, Kerri L Coon, Mark R Brown, Michael R Strand
Mosquitoes host communities of microbes in their digestive tract that consist primarily of bacteria. We previously reported that Aedes aegypti larvae colonized by a native community of bacteria and gnotobiotic larvae colonized by only Escherichia coli develop very similarly into adults, whereas axenic larvae never molt and die as first instars. In this study, we extended these findings by first comparing the growth and abundance of bacteria in conventional, gnotobiotic, and axenic larvae during the first instar...
January 6, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28059104/synthesis-and-insecticidal-activity-of-acridone-derivatives-to-aedes-aegypti-and-culex-quinquefasciatus-larvae-and-non-target-aquatic-species
#13
Selvaraj Mohana Roopan, Annadurai Bharathi, Naif Abdullah Al-Dhabi, Mariadhas Valan Arasu, G Madhumitha
A serious Mosquito borne yellow fever is one of the grave diseases which affect the major population. Since there is no specific treatment for yellow fever, there is a necessity to develop an effective agent. The series of acridinone analogues 3 to 5 were synthesized with help of non-conventional microwave heating and confirmed by respective spectral characterization. 5c and 3b showed highest activity to kill 90% of larvae against A. aegypti and C. quinquefasciatus, respectively. Also the active products were treated to check the mortality of non-target aquatic species...
January 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28057066/evaluations-of-dual-attractant-toxic-sugar-baits-for-surveillance-and-control-of-aedes-aegypti-and-aedes-albopictus-in-florida
#14
Jodi M Scott-Fiorenzano, Alice P Fulcher, Kelly E Seeger, Sandra A Allan, Daniel L Kline, Philip G Koehler, Günter C Müller, Rui-De Xue
BACKGROUND: Dual attractant toxic sugar baits (D-ATSB) containing two host kairomones, L-lactic (LA) and 1-octen-3-ol (O), and fruit-based attractants were evaluated through olfactory, consumption and mortality, and semi-field experiments to determine if host kairomones could first, enhance attraction of a fruit-based (attractant) toxic sugar bait (ATSB), and second, increase the efficacy of a fruit based attractive toxic sugar bait (ATSB). METHODS: Four combinations of LA and O were incorporated into the ATSB and evaluated in an olfactometer to determine if these combinations could enhance attraction of Aedes aegypti (L...
January 5, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28056065/wolbachia-infections-in-aedes-aegypti-differ-markedly-in-their-response-to-cyclical-heat-stress
#15
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/28054419/identification-and-initial-characterization-of-matrix-metalloproteinases-in-the-yellow-fever-mosquito-aedes-aegypti
#16
A M Kantor, S Dong, N L Held, E Ishimwe, A L Passarelli, R J Clem, A W E Franz
Aedes aegypti is a major vector for arboviruses such as dengue, chikungunya and Zika viruses. During acquisition of a viremic bloodmeal, an arbovirus infects mosquito midgut cells before disseminating to secondary tissues, including the salivary glands. Once virus is released into the salivary ducts it can be transmitted to another vertebrate host. The midgut is surrounded by a basal lamina (BL) in the extracellular matrix, consisting of a proteinaceous mesh composed of collagen IV and laminin. BL pore size exclusion limit prevents virions from passing through...
February 2017: Insect Molecular Biology
https://www.readbyqxmd.com/read/28054003/data-documenting-the-potential-distribution-of-aedes-aegypti-in-the-center-of-veracruz-mexico
#17
Israel Estrada-Contreras, César A Sandoval-Ruiz, Fredy S Mendoza-Palmero, Sergio Ibáñez-Bernal, Miguel Equihua, Griselda Benítez
The data presented in this article are related to the research article entitled "Establishment of Aedes aegypti (L.) in mountainous regions in Mexico: Increasing number of population at risk of mosquito-borne disease and future climate conditions" (M. Equihua, S. Ibáñez-Bernal, G. Benítez, I. Estrada-Contreras, C.A. Sandoval-Ruiz, F.S. Mendoza-Palmero, 2016) [1]. This article provides presence records in shapefile format used to generate maps of potential distribution of Aedes aegypti with different climate change scenarios as well as each of the maps obtained in raster format...
February 2017: Data in Brief
https://www.readbyqxmd.com/read/28052065/comparison-of-stable-and-transient-wolbachia-infection-models-in-aedes-aegypti-to-block-dengue-and-west-nile-viruses
#18
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/28049478/the-transcriptome-of-the-mosquito-aedes-fluviatilis-diptera-culicidae-and-transcriptional-changes-associated-with-its-native-wolbachia-infection
#19
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/28043395/artesunate-tafenoquine-combination-therapy-promotes-clearance-and-abrogates-transmission-of-the-avian-malaria-parasite-plasmodium-gallinaceum
#20
Suchada Tasai, Tawee Saiwichai, Morakot Kaewthamasorn, Sonthaya Tiawsirisup, Prayute Buddhirakkul, Sirintip Chaichalotornkul, Sittiporn Pattaradilokrat
Clinical manifestations of malaria infection in vertebrate hosts arise from the multiplication of the asexual stage parasites in the blood, while the gametocytes are responsible for the transmission of the disease. Antimalarial drugs that target the blood stage parasites and transmissible gametocytes are rare, but are essentially needed for the effective control of malaria and for limiting the spread of resistance. Artemisinin and its derivatives are the current first-line antimalarials that are effective against the blood stage parasites and gametocytes, but resistance to artemisinin has now emerged and spread in various malaria endemic areas...
January 15, 2017: Veterinary Parasitology
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