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https://www.readbyqxmd.com/read/29029145/blood-meal-source-characterization-using-illumina-sequencing-in-the-chagas-disease-vector-rhodnius-pallescens-hemiptera-reduviidae-in-panam%C3%A3
#1
Troy J Kieran, Nicole L Gottdenker, Christina P Varian, Azael Saldaña, Nicolas Means, Darlisha Owens, Jose E Calzada, Travis C Glenn
Accurate blood meal identification is critical to understand hematophagous vector-host relationships. This study describes a customizable Next-Generation Sequencing (NGS) approach to identify blood meals from Rhodnius pallescens (Hemiptera: Reduviidae) triatomines using multiple barcoded primers and existing software to pick operational taxonomic units and match sequences for blood meal identification. We precisely identified all positive control samples using this method and further examined 74 wild-caught R...
October 4, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/29018364/cloning-and-functional-characterization-of-oct%C3%AE-2-receptor-and-tyr1-receptor-in-the-chagas-disease-vector-rhodnius-prolixus
#2
Sam Hana, Angela B Lange
Octopamine and tyramine, both biogenic amines, are bioactive chemicals important in diverse physiological processes in invertebrates. In insects, octopamine and tyramine operate analogously to epinephrine and norepinephrine in the vertebrates. Octopamine and tyramine bind to G-protein coupled receptors (GPCRs) leading to changes in second messenger levels and thereby modifying the function in target tissues and insect behavior. In this paper, we report the cDNA sequences of two GPCRs, RhoprOctβ2-R, and RhoprTyr1-R, have been cloned and functionally characterized from Rhodnius prolixus...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29017584/american-trypanosomiasis-or-chagas-disease-in-panama-a-chronological-synopsis-of-ecological-and-epidemiological-research
#3
REVIEW
Indra G Rodriguez, Jose R Loaiza
American trypanosomiasis, or Chagas disease, is a growing public health problem in Panama, and further forest degradation due to human population growth is expected to worsen the situation. Most people infected with the parasite Trypanosoma cruzi are silently ill, and their life expectancy is severely compromised, which contributes to further deterioration of living conditions in endemic regions. Here, we review the outcomes of nearly 100 years of ecological and epidemiological investigation about Chagas disease in Panama, in an attempt to highlight progress, identify needs, and re-orient future efforts...
October 10, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28968383/distribution-of-triatomine-species-in-domestic-and-peridomestic-environments-in-central-coastal-ecuador
#4
Mario J Grijalva, Anita G Villacís, Ana L Moncayo, Sofia Ocaña-Mayorga, Cesar A Yumiseva, Esteban G Baus
BACKGROUND: Although the central coast of the Ecuador is considered endemic for Chagas disease, few studies have focused on determining the risk of transmission in this region. In this study we describe the triatomine household infestation in Manabí province (Central Coast region), determine the rate of Trypanosoma cruzi infection and study the risk factors associated with infestation by Rhodnius ecuadoriensis. METHODOLOGY/PRINCIPAL FINDINGS: An entomological survey found three triatomine species (Rhodnius ecuadoriensis, Panstrongylus rufotuberculatus and P...
October 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28968005/-blood-feeding-of-rhodnius-prolixus
#5
Kevin Escandón-Vargas, Carlos A Muñoz-Zuluaga, Liliana Salazar
Triatomines (Hemiptera: Reduviidae) are blood-sucking insect vectors of the protozoan Trypanosoma cruzi which is the causative agent of Chagas' disease. Rhodnius prolixus is the most epidemiologically important vector of T. cruzi in Colombia. Triatomines are regarded to be vessel-feeders as they obtain their blood meals from vertebrate hosts by directly inserting their mouthparts into vessels. Microscopic techniques are useful for visualizing and describing the morphology of biological structures. Here, we show images of the blood-feeding of R...
September 1, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/28887123/third-record-of-rhodnius-amazonicus-and-comparative-study-with-r-pictipes-hemiptera-reduviidae-triatominae
#6
João Aristeu da Rosa, Eder Santos Souza, Adelson da Costa Teixeira, Rosenildo Ribeiro Barbosa, Aecildo José de Souza, Tiago Belintani, Juliana Damieli Nascimento, Hélcio Reinaldo Gil-Santana, Jader de Oliveira
Rhodnius amazonicus Almeida et al. (1973) is a triatomine of rare occurrence. This species was found for the third time in Breves city, Pará state, Brazil. Morphometric and morphological studies were carried out on one male and one female. Lent and Wygodzinsky (1979) considered this species as a synonym of R. pictipes, until its revalidation after 23 years by Bérenger and Pluot-Sigwalt (2002). Considering the synonym mentioned above, a comparative study between these two species was performed in order to report the third encounter of this species, and increase the number of morphological characters that distinguish R...
December 2017: Acta Tropica
https://www.readbyqxmd.com/read/28822204/comparative-2-d-electrophoresis-of-salivary-proteins-in-triatoma-dimidiata-and-rhodnius-prolixus-hemiptera-reduviidae-and-major-cross-reactive-antigens
#7
Victor Monteon, Ivan May-Gil, Karla Acosta-Viana, Angel Ramos-Logonio, Oscar Hernandez, Ruth Lopez
An immune response to triatomine’s saliva is an immunological marker of exposure to triatomine bites. However, considerable variability in salivary protein profiles did exist among species. In the present work, we compare salivary proteins from Mexican Triatoma dimidiata and Rhodnius prolixus using 2-D electrophoresis. A clear differential saliva profile was found to exist between these two triatomine species. Fewer protein spots were detected in R. prolixus than in T. dimidiata. More than half of the proteins had an isoelectric point between 5 and 7 and a molecular weight between 10 and 30 kDa in T...
2017: Annals of Parasitology
https://www.readbyqxmd.com/read/28769676/a-new-species-of-rhodnius-from-brazil-hemiptera-reduviidae-triatominae
#8
João Aristeu da Rosa, Hernany Henrique Garcia Justino, Juliana Damieli Nascimento, Vagner José Mendonça, Claudia Solano Rocha, Danila Blanco de Carvalho, Rossana Falcone, Maria Tercília Vilela de Azeredo Oliveira, Kaio Cesar Chaboli Alevi, Jader de Oliveira
A colony was formed from eggs of a Rhodnius sp. female collected in Taquarussu, Mato Grosso do Sul, Brazil, and its specimens were used to describe R. taquarussuensissp. n. This species is similar to R. neglectus, but distinct characters were observed on the head, thorax, abdomen, female external genitalia and male genitalia. Chromosomal differences between the two species were also established.
2017: ZooKeys
https://www.readbyqxmd.com/read/28723901/2b-rad-genotyping-for-population-genomic-studies-of-chagas-disease-vectors-rhodnius-ecuadoriensis-in-ecuador
#9
Luis E Hernandez-Castro, Marta Paterno, Anita G Villacís, Björn Andersson, Jaime A Costales, Michele De Noia, Sofía Ocaña-Mayorga, Cesar A Yumiseva, Mario J Grijalva, Martin S Llewellyn
BACKGROUND: Rhodnius ecuadoriensis is the main triatomine vector of Chagas disease, American trypanosomiasis, in Southern Ecuador and Northern Peru. Genomic approaches and next generation sequencing technologies have become powerful tools for investigating population diversity and structure which is a key consideration for vector control. Here we assess the effectiveness of three different 2b restriction site-associated DNA (2b-RAD) genotyping strategies in R. ecuadoriensis to provide sufficient genomic resolution to tease apart microevolutionary processes and undertake some pilot population genomic analyses...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28722578/study-of-the-salivary-glands-in-triatominae-hemiptera-reduviidae-triatominae-their-color-and-application-to-the-chagas-disease-vector-evolution
#10
Jader de Oliveira, Amanda Ravazi, Eder Dos Santos Souza, Felipe Ferraz Figueiredo Moreira, Cleber Galvão, João Aristeu da Rosa, Kaio Cesar Chaboli Alevi
Chagas disease is caused by Trypanosoma cruzi and transmitted by feces of a triatomine that has the habit of defecating during blood feeding. The salivary glands of triatomines are important to hematophagy because their saliva is rich in anticoagulant and hemolytic proteins. The salivary glands of some Rhodnius species analyzed are reddish due to the presence of nitrophorins (antihemostatic activity). The present study aimed to analyze the color pattern of the salivary glands of 67 triatomine species to evaluate whether the presence of nitrophorins is a synapomorphy of Rhodnius or the tribe Rhodniini, or if it is shared with triatomines of the tribes Triatomini and Cavernicolini...
September 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28694056/the-involvement-of-rhopr-crf-dh-in-feeding-and-reproduction-in-the-blood-gorging-insect-rhodnius-prolixus
#11
Shirin Mollayeva, Ian Orchard, Angela B Lange
Rhodnius prolixus is a blood-gorging insect and a vector for human Chagas disease. The insect transmits the disease following feeding, when it excretes urine and feces contaminated with the Trypanosoma cruzi parasite. A corticotropin-releasing factor-like peptide acts as a diuretic hormone in R. prolixus (Rhopr-CRF/DH); however, its distribution throughout the insect's central nervous system (CNS) and the expression of its receptor in feeding-related tissue as well as the female reproductive system suggests a multifaceted role for the hormone beyond that of diuresis...
July 7, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28671979/evolution-and-multiple-roles-of-the-pancrustacea-specific-transcription-factor-zelda-in-insects
#12
Lupis Ribeiro, Vitória Tobias-Santos, Daniele Santos, Felipe Antunes, Geórgia Feltran, Jackson de Souza Menezes, L Aravind, Thiago M Venancio, Rodrigo Nunes da Fonseca
Gene regulatory networks (GRNs) evolve as a result of the coevolutionary processes acting on transcription factors (TFs) and the cis-regulatory modules they bind. The zinc-finger TF zelda (zld) is essential for the maternal-to-zygotic transition (MZT) in Drosophila melanogaster, where it directly binds over thousand cis-regulatory modules to regulate chromatin accessibility. D. melanogaster displays a long germ type of embryonic development, where all segments are simultaneously generated along the whole egg...
July 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28653592/catalase-expression-impairs-oxidative-stress-mediated-signalling-in-trypanosoma-cruzi
#13
Anna Cláudia Guimarães Freire, Ceres Luciana Alves, Grazielle Ribeiro Goes, Bruno Carvalho Resende, Nilmar Silvio Moretti, Vinícius Santana Nunes, Pedro Henrique Nascimento Aguiar, Erich Birelli Tahara, Glória Regina Franco, Andréa Mara Macedo, Sérgio Danilo Junho Pena, Fernanda Ramos Gadelha, Alessandra Aparecida Guarneri, Sergio Schenkman, Leda Quercia Vieira, Carlos Renato Machado
Trypanosoma cruzi is exposed to oxidative stresses during its life cycle, and amongst the strategies employed by this parasite to deal with these situations sits a peculiar trypanothione-dependent antioxidant system. Remarkably, T. cruzi's antioxidant repertoire does not include catalase. In an attempt to shed light on what are the reasons by which this parasite lacks this enzyme, a T. cruzi cell line stably expressing catalase showed an increased resistance to hydrogen peroxide (H2O2) when compared with wild-type cells...
June 27, 2017: Parasitology
https://www.readbyqxmd.com/read/28636880/behavioral-evidence-of-oxidative-stress-by-hematophagy-in-the-ocellar-system-of-rhodnius-prolixus-st%C3%A3-l-1859-red-eyed-mutants
#14
Carlos Alberto Vija-Suarez, Mario Iván Ortiz, Jorge Molina
The photonegative response to light stimulation in Rhodnius prolixus (Reduviidae, Triatominae) is modulated by compound eyes and ocelli. Screening pigments in the visual system have been shown to protect the cellular structures from the oxidative stress damage produced by blood ingestion and light stimulation. Red-eyed mutants of Rhodnius prolixus lack screening pigments in their compound eyes and ocelli and are exposed to more oxidative stress. Experiments with Rhodnius prolixus and Triatoma infestans red-eyed mutants reared from the first nymphal stage show damage in the retinas of the compound eyes and a decrease in photonegative responses due to light stimulation...
August 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28606853/proteomic-analysis-of-the-kissing-bug-rhodnius-prolixus-antenna
#15
Daniele S Oliveira, Nathalia F Brito, Fabio C S Nogueira, Monica F Moreira, Walter S Leal, Marcia R Soares, Ana C A Melo
Reception of odorants is essential in insects' life since the chemical signals in the environment (=semiochemicals) convey information about availability of hosts for a blood meal, mates for reproduction, sites for oviposition and other relevant information for fitness in the environment. Once they reach the antennae, these semiochemicals bind to odorant-binding proteins and are transported through the sensillar lymph until reach the odorant receptors. Such perireceptor events, particularly the interactions with transport proteins, are the liaison between the external environment and the entire neuroethological system and, therefore, a potential target to disrupt insect chemical communication...
July 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28602911/jaburetox-induced-toxic-effects-on-the-hemocytes-of-rhodnius-prolixus-hemiptera-reduviidae
#16
Natalia R Moyetta, Valquiria Broll, Ana Paula A Perin, Augusto F Uberti, Matheus V Coste Grahl, Fernanda Staniscuaski, Celia R Carlini, Leonardo L Fruttero
Jaburetox is a recombinant peptide derived from a Canavalia ensiformis urease that presents toxic effects upon several species of insects, phytopathogenic fungi and yeasts of medical importance. So far, no toxicity of Jaburetox to mammals has been shown. Previous reports have identified biochemical targets of this toxic peptide in insect models, although its mechanism of action is not completely understood. In this work, we aimed to characterize the effects of Jaburetox in hemolymphatic insect cells. For this purpose, the model insect and Chagas' disease vector Rhodnius prolixus was used...
June 8, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28562785/cytogenetic-analysis-in-different-populations-of-rhodnius-prolixus-and-r-nasutus-from-different-countries-of-south-america
#17
A Ravazi, K C C Alevi, J Oliveira, J A Rosa, M T V Azeredo-Oliveira
No abstract text is available yet for this article.
May 25, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/28553236/standardization-of-a-continuous-assay-for-glycosidases-and-its-use-for-screening-insect-gut-samples-at-individual-and-populational-levels
#18
Gerson S Profeta, Jessica A S Pereira, Samara G Costa, Patricia Azambuja, Eloi S Garcia, Caroline da Silva Moraes, Fernando A Genta
Glycoside Hydrolases (GHs) are enzymes able to recognize and cleave glycosidic bonds. Insect GHs play decisive roles in digestion, in plant-herbivore, and host-pathogen interactions. GH activity is normally measured by the detection of a release from the substrate of products as sugars units, colored, or fluorescent groups. In most cases, the conditions for product release and detection differ, resulting in discontinuous assays. The current protocols result in using large amounts of reaction mixtures for the obtainment of time points in each experimental replica...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28546079/pioneer-study-of-population-genetics-of-rhodnius-ecuadoriensis-hemiptera-reduviidae-from-the-central-coastand-southern-andean-regions-of-ecuador
#19
Anita G Villacís, Paula L Marcet, César A Yumiseva, Ellen M Dotson, Michel Tibayrenc, Simone Frédérique Brenière, Mario J Grijalva
Effective control of Chagas disease vector populations requires a good understanding of the epidemiological components, including a reliable analysis of the genetic structure of vector populations. Rhodnius ecuadoriensis is the most widespread vector of Chagas disease in Ecuador, occupying domestic, peridomestic and sylvatic habitats. It is widely distributed in the central coast and southern highlands regions of Ecuador, two very different regions in terms of bio-geographical characteristics. To evaluate the genetic relationship among R...
May 22, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28527286/-possible-oral-transmission-of-chagas-disease-among-hydrocarbons-sector-workers-in-casanare-colombia-2014
#20
Liliana Patricia Zuleta-Dueñas, Ángela Johana López-Quiroga, Fernando Torres-Torres, Oneida Castañeda-Porras
INTRODUCTION: Trypanosoma cruzi, the etiological agent for Chagas disease, can be transmitted by oral intake of contaminated food or drinks. During epidemiological week 14 of 2014, two cases of acute Chagas disease were notified among hydrocarbons sector workers in Paz de Ariporo, Casanare. OBJECTIVE: To characterize the affected population, to establish control and prevention measures and to confirm the outbreak. MATERIALS AND METHODS: We conducted an outbreak investigation that included the following components: a) Search for symptomatic people compatible with Chagas disease according to the case definition for their referral to medical services; b) entomological survey (192/197 houses); c) sanitary inspection and microbiological analysis of food samples; and d) study of reservoirs...
June 1, 2017: Biomédica: Revista del Instituto Nacional de Salud
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