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Aedes aegypti bacillus thuringiensis

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https://www.readbyqxmd.com/read/28927441/insecticide-susceptibility-of-aedes-albopictus-and-ae-aegypti-from-brazil-and-the-swiss-italian-border-region
#1
Tobias Suter, Mônica Maria Crespo, Mariana Francelino de Oliveira, Thaynan Sama Alves de Oliveira, Maria Alice Varjal de Melo-Santos, Cláudia Maria Fontes de Oliveira, Constância Flávia Junqueira Ayres, Rosângela Maria Rodrigues Barbosa, Ana Paula Araújo, Lêda Narcisa Regis, Eleonora Flacio, Lukas Engeler, Pie Müller, Maria Helena Neves Lobo Silva-Filha
BACKGROUND: Aedes aegypti and Ae. albopictus are two highly invasive mosquito species, both vectors of several viruses, including dengue, chikungunya and Zika. While Ae. aegypti is the primary vector in the tropics and sub-tropics, Ae. albopictus is increasingly under the public health watch as it has been implicated in arbovirus-transmission in more temperate regions, including continental Europe. Vector control using insecticides is the pillar of most control programmes; hence development of insecticide resistance is of great concern...
September 19, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28900215/highly-effective-broad-spectrum-chimeric-larvicide-that-targets-vector-mosquitoes-using-a-lipophilic-protein
#2
Dennis K Bideshi, Hyun-Woo Park, Robert H Hice, Margaret C Wirth, Brian A Federici
Two mosquitocidal bacteria, Bacillus thuringiensis subsp. israelensis (Bti) and Lysinibacillus sphaericus (Ls) are the active ingredients of commercial larvicides used widely to control vector mosquitoes. Bti's efficacy is due to synergistic interactions among four proteins, Cry4Aa, Cry4Ba, Cry11Aa, and Cyt1Aa, whereas Ls's activity is caused by Bin, a heterodimer consisting of BinA, the toxin, and BinB, a midgut-binding protein. Cyt1Aa is lipophilic and synergizes Bti Cry proteins by increasing midgut binding...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28888766/a-natural-hybrid-of-a-bacillus-thuringiensis-cry2a-toxin-implicates-domain-i-in-specificity-determination
#3
Changlong Shu, Fengjiao Zhang, Guihua Chen, Lazarus Joseph, Aminah Barqawi, Jacob Evans, Fuping Song, Guoxun Li, Jie Zhang, Neil Crickmore
A PCR-RFLP method was used to identify cry2A toxin genes in a collection of 300 strains of Bacillus thuringiensis. From 81 genes identified, the vast majority appeared to be cry2Aa or cry2Ab, however three showed a different pattern and were subsequently cloned and sequenced. The gene cloned from strain HD395 was named cry2Ba2. Since the proteins encoded by the genes cloned from LS5115-3 and DS415 shared >95% sequence identity with existing toxins their genes were named cry2Aa17 and cry2Ab29 respectively by the toxin nomenclature committee...
September 6, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28754251/mosquitocidal-potential-of-silver-nanoparticles-synthesized-using-local-isolates-of-bacillus-thuringiensis-subsp-israelensis-and-their-synergistic-effect-with-a-commercial-strain-of-b-thuringiensis-subsp-israelensis
#4
Anon Thammasittirong, Kanchana Prigyai, Sutticha Na-Ranong Thammasittirong
Control of larval stages of Aedes aegypti is considered an effective approach for preventing outbreaks of dengue fever. In this work, silver nanoparticles (Ag NPs) were synthesized using the supernatant and insecticidal proteins from local isolates of Bacillus thuringiensis subsp. israelensis (Bti). Mosquitocidal activity assays against A. aegypti larvae revealed that the highest toxicity was obtained from the Ag NPs synthesized using supernatant of Bti K55 and the inclusion proteins of Bti K46 with a lethal concentration 50 (LC50) of 0...
December 2017: Acta Tropica
https://www.readbyqxmd.com/read/28713202/toward-mosquito-control-with-a-green-alga-expression-of-cry-toxins-of-bacillus-thuringiensis-subsp-israelensis-bti-in-the-chloroplast-of-chlamydomonas
#5
Seongjoon Kang, Obed W Odom, Saravanan Thangamani, David L Herrin
We are developing Chlamydomonas strains that can be used for safe and sustainable control of mosquitoes, because they produce proteins from Bacillus thuringiensis subsp. israelensis (Bti) in the chloroplast. Chlamydomonas has a number of advantages for this approach, including genetic controls that are not generally available with industrial algae. The Bti toxin has been used for mosquito control for > 30 years and does not engender resistance; it contains three Cry proteins, Cry4Aa (135 kDa), Cry4Ba (128 kDa) and Cry11Aa (72 kDa), and Cyt1Aa (25 kDa)...
June 2017: Journal of Applied Phycology
https://www.readbyqxmd.com/read/28597156/molecular-characterization-of-indigenous-bacillus-thuringiensis-strains-isolated-from-kashmir-valley
#6
A L Reyaz, L Gunapriya, P Indra Arulselvi
Bacillus thuringiensis (Bt) being an eco-friendly bioinsecticide is effectively used in pest management strategies and, therefore, isolation and identification of new strains effective against a broad range of target pests is important. In the present study, new indigenous B. thuringiensis strains were isolated and investigated so that these could be used as an alternative and/or support the current commercial strains/cry proteins in use. For this, 159 samples including soil, leaf and spider webs were collected from ten districts of Kashmir valley (India)...
June 2017: 3 Biotech
https://www.readbyqxmd.com/read/28587836/functional-characterization-of-aedes-aegypti-alkaline-phosphatase-alp1-involved-in-the-toxicity-of-cry-toxins-from-bacillus-thuringiensis-subsp-israelensis-and-jegathesan
#7
Jianwu Chen, Karly Aimanova, Sarjeet S Gill
Presently three major groups of proteins from Aedes aegypti, cadherin, alkaline phosphatases (ALP) and aminopeptidases N (APN), have been identified as Cry11Aa toxin receptors. To further characterize their role on toxicity, transgenic mosquitoes with silenced Aedes cadherin expression were previously generated and the role of cadherin in mediating the toxicity of four different mosquitocidal toxins (Cry11Aa, Cry11Ba, Cry4Aa and Cry4Ba) was demonstrated. Here, we investigated the role of another reported Cry11Aa receptor, ALP1...
June 3, 2017: Peptides
https://www.readbyqxmd.com/read/28399278/transcriptional-profile-for-detoxification-enzymes-aeaggt1-and-aaeggt2-from-aedes-aegypti-diptera-culicidae-in-response-to-larvicides
#8
Liming Zhao, Barry W Alto, Dagne Duguma
Aedes aegypti (L.) is the vector responsible for transmitting dengue, chikungunya, yellow fever, and Zika viruses, as well as other pathogens. Microbial larvicides based on Bacillus thuringiensis Berliner israelensis (Bti) and Saccharopolyspora spinosa Mertz and Yao, such as VectoBac 12AS and Natular 2EC, have been shown to be effective in reducing larval populations of Ae. aegypti. We examined the gene expression of two detoxification enzymes, glucosyl and glucuronosyl transferases (AaeGGT1 and AaeGGT2), through developmental stages and a time course study in response to larvicide exposure using qualitative real-time polymerase chain reaction (qPCR)...
July 1, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28199323/a-large-scale-biorational-approach-using-bacillus-thuringiensis-israeliensis-strain-am65-52-for-managing-aedes-aegypti-populations-to-prevent-dengue-chikungunya-and-zika-transmission
#9
Catherine A Pruszynski, Lawrence J Hribar, Robert Mickle, Andrea L Leal
BACKGROUND: Aedes aegypti is a container-inhabiting mosquito and a vector of dengue, chikungunya, and Zika viruses. In 2009 several cases of autochthonous dengue transmission were reported in Key West, Florida, USA prompting a comprehensive response to control A. aegypti. In Key West, larvae of this mosquito develop in containers around human habitations which can be numerous and labor intensive to find and treat. Aerial applications of larvicide covering large areas in a short time can be an efficient and economical method to control A...
2017: PloS One
https://www.readbyqxmd.com/read/28187780/levels-of-insecticide-resistance-to-deltamethrin-malathion-and-temephos-and-associated-mechanisms-in-aedes-aegypti-mosquitoes-from-the-guadeloupe-and-saint-martin-islands-french-west-indies
#10
Daniella Goindin, Christelle Delannay, Andric Gelasse, Cédric Ramdini, Thierry Gaude, Frédéric Faucon, Jean-Philippe David, Joël Gustave, Anubis Vega-Rua, Florence Fouque
BACKGROUND: In the Guadeloupe and Saint Martin islands, Aedes aegypti mosquitoes are the only recognized vectors of dengue, chikungunya, and Zika viruses. For around 40 years, malathion was used as a mosquito adulticide and temephos as a larvicide. Since the European Union banned the use of these two insecticide molecules in the first decade of the 21st century, deltamethrin and Bacillus thuringiensis var. israelensis are the remaining adulticide and larvicide, respectively, used in Guadeloupe...
February 10, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/27908637/response-of-three-cyprinid-fish-species-to-the-scavenger-deterrent-factor-produced-by-the-mutualistic-bacteria-associated-with-entomopathogenic-nematodes
#11
Ramalingam Karthik Raja, Dilipkumar Aiswarya, Baris Gulcu, Manickam Raja, Pachiappan Perumal, Sivaperumal Sivaramakrishnan, Harry K Kaya, Selcuk Hazir
The symbiotic bacteria, Photorhabdus and Xenorhabdus associated with entomopathogenic nematodes (EPNs) in the genera Heterorhabditis and Steinernema, respectively, produce a compound(s) called the Scavenging Deterrent Factor (SDF). SDF deters a number of terrestrial insect scavengers and predators and one bird species from feeding on host insects killed by the nematode-bacterium complex but has not been tested against aquatic vertebrates. Moreover, the Heterorhabditis-Photorhabdus association is believed to have evolved in an aquatic environment...
February 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/27881148/susceptibility-profile-and-metabolic-mechanisms-involved-in-aedes-aegypti-and-aedes-albopictus-resistant-to-ddt-and-deltamethrin-in-the-central-african-republic
#12
Carine Ngoagouni, Basile Kamgang, Cécile Brengues, Gildas Yahouedo, Christophe Paupy, Emmanuel Nakouné, Mirdad Kazanji, Fabrice Chandre
BACKGROUND: Aedes aegypti and Ae. albopictus are the main epidemic vectors of dengue, chikungunya and Zika viruses worldwide. Their control during epidemics relies mainly on control of larvae and adults with insecticides. Unfortunately, loss of susceptibility of both species to several insecticide classes limits the efficacy of interventions. In Africa, where Aedes-borne viruses are of growing concern, few data are available on resistance to insecticides. To fill this gap, we assessed the susceptibility to insecticides of Ae...
November 24, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27812601/pyriproxyfen-and-the-microcephaly-epidemic-in-brazil-an-ecological-approach-to-explore-the-hypothesis-of-their-association
#13
Maria de Fatima P Militão de Albuquerque, Wayner V de Souza, Antônio da Cruz G Mendes, Tereza M Lyra, Ricardo Aa Ximenes, Thália Vb Araújo, Cynthia Braga, Demócrito B Miranda-Filho, Celina Mt Martelli, Laura C Rodrigues
The microcephaly epidemic in Brazil generated intense debate regarding its causality, and one hypothesised cause of this epidemic, now recognised as congenital Zika virus syndrome, was the treatment of drinking water tanks with pyriproxyfen to control Aedes aegypti larvae. We present the results of a geographical analysis of the association between the prevalence of microcephaly confirmed by Fenton growth charts and the type of larvicide used in the municipalities that were home to the mothers of the affected newborns in the metropolitan region of Recife in Pernambuco, the state in Brazil where the epidemic was first detected...
December 2016: Memórias do Instituto Oswaldo Cruz
https://www.readbyqxmd.com/read/27684886/local-mosquito-borne-transmission-of-zika-virus-miami-dade-and-broward-counties-florida-june-august-2016
#14
Anna Likos, Isabel Griffin, Andrea M Bingham, Danielle Stanek, Marc Fischer, Stephen White, Janet Hamilton, Leah Eisenstein, David Atrubin, Prakash Mulay, Blake Scott, Patrick Jenkins, Danielle Fernandez, Edhelene Rico, Leah Gillis, Reynald Jean, Marshall Cone, Carina Blackmore, Janet McAllister, Chalmers Vasquez, Lillian Rivera, Celeste Philip
During the first 6 months of 2016, large outbreaks of Zika virus disease caused by local mosquito-borne transmission occurred in Puerto Rico and other U.S. territories, but local mosquito-borne transmission was not identified in the continental United States (1,2). As of July 22, 2016, the Florida Department of Health had identified 321 Zika virus disease cases among Florida residents and visitors, all occurring in either travelers from other countries or territories with ongoing Zika virus transmission or sexual contacts of recent travelers...
September 30, 2016: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/27627758/bacterial-larvicide-bacillus-thuringiensis-israelensis-strain-am-65-52-water-dispersible-granule-formulation-impacts-both-dengue-vector-aedes-aegypti-l-population-density-and-disease-transmission-in-cambodia
#15
To Setha, Ngan Chantha, Seleena Benjamin, Doung Socheat
A multi-phased study was conducted in Cambodia from 2005-2011 to measure the impact of larviciding with the bacterial larvicide, Bacillus thuringiensis israelensis (Bti), a water dispersible granule (WG) formulation on the vector, Aedes aegypti (L.) and the epidemiology. In our studies, all in-use containers were treated at 8 g/1000 L, including smaller containers and animal feeders which were found to contribute 23% of Ae aegypti pupae. The treated waters were subjected to routine water exchange activities...
September 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27491031/one-pot-biogenic-fabrication-of-silver-nanocrystals-using-quisqualis-indica-effectiveness-on-malaria-and-zika-virus-mosquito-vectors-and-impact-on-non-target-aquatic-organisms
#16
Marimuthu Govindarajan, Periasamy Vijayan, Shine Kadaikunnan, Naiyf S Alharbi, Giovanni Benelli
Currently, mosquito vector control is facing a number of key challenges, including the rapid development of resistance to synthetic pesticides and the recent spread of aggressive arbovirus outbreaks. The biosynthesis of silver nanoparticles (AgNPs) is currently considered an environmental friendly alternative to the employ of pyrethroids, carbamates and microbial agents (e.g. Bacillus thuringiensis var. israelensis), since AgNPs are easy to produce, effective and stable in the aquatic environment. However, their biophysical features showed wide variations according to the botanical agent using for the green synthesis, outlining the importance of screening local floral resources used as reducing and stabilizing agents...
September 2016: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/27418233/receptors-are-affected-by-selection-with-each-bacillus-thuringiensis-israelensis-cry-toxin-but-not-with-the-full-bti-mixture-in-aedes-aegypti
#17
Renaud Stalinski, Frederic Laporte, Guillaume Tetreau, Laurence Després
Bacillus thuringiensis israelensis (Bti) toxins are increasingly used for mosquito control, but little is known about the precise mode of action of each of these toxins, and how they interact to kill mosquito larvae. By using RNA sequencing, we investigated change in gene transcription level and polymorphism variations associated with resistance to each Bti Cry toxin and to the full Bti toxin mixture in the dengue vector Aedes aegypti. The up-regulation of genes related to chitin metabolism in all selected strain suggests a generalist, non-toxin-specific response to Bti selection in Aedes aegypti...
October 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/26922177/the-use-of-aedes-aegypti-larvae-attractants-to-enhance-the-effectiveness-of-larvicides
#18
Paula V Gonzalez, Laura Harburguer, Paola A González-Audino, Héctor M Masuh
Aedes aegypti (L.) is an important dengue, chikungunya, and yellow fever vector. Immature stages of this species inhabit human-made containers placed in residential landscapes, and the application of larvicides inside containers that cannot be eliminated is still considered a priority in control programs. Larvicidal efficacy is influenced by several factors, including the formulation used, the water quality, and the susceptibility of larvae, among others. If an attractant can be incorporated into a slow-release larvicide formulation, it will be feasible to direct the larvae into the source of insecticide and thereby improving its efficacy...
June 2016: Parasitology Research
https://www.readbyqxmd.com/read/26910489/toxin-stability-improvement-and-toxicity-increase-against-dipteran-and-lepidopteran-larvae-of-bacillus-thuringiensis-crystal-protein-cry2aa
#19
Jihen Elleuch, Samir Jaoua, Carole Ginibre, Fabrice Chandre, Slim Tounsi, Raida Z Zghal
BACKGROUND: Bacillus thuringiensis δ-endotoxins are the most widely used biopesticides for controlling economically important crop pests and disease vectors. Improving their efficacy is of great benefit. Here, an improvement in Cry2Aa δ-endotoxin toxicity was attempted via a cry gene over expression system using P20 from B. thuringiensis israelensis. RESULTS: The coexpression of Cry2Aa with P20 resulted in a seven fold increase in its production yield in B. thuringiensis...
December 2016: Pest Management Science
https://www.readbyqxmd.com/read/26871951/transstadial-effects-of-bti-on-traits-of-aedes-aegypti-and-infection-with-dengue-virus
#20
Barry W Alto, Cynthia C Lord
Most mosquito control efforts are primarily focused on reducing the adult population size mediated by reductions in the larval population, which should lower risk of disease transmission. Although the aim of larviciding is to reduce larval abundance and thus recruitment of adults, nonlethal effects on adults are possible, including transstadial effects on phenotypes of adults such as survival and pathogen infection and transmission. In addition, the mortality induced by control efforts may act in conjunction with other sources of mosquito mortality in nature...
February 2016: PLoS Neglected Tropical Diseases
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