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malaria polymorphism

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https://www.readbyqxmd.com/read/28077587/malaria-parasitemia-and-parasite-density-in-antiretroviral-treated-hiv-infected-adults-following-discontinuation-of-cotrimoxazole-prophylaxis
#1
Ronald K Ottichilo, Christina S Polyak, Bernard Guyah, Benson Singa, Josphat Nyataya, Krista Yuhas, Grace John-Stewart, John N Waitumbi
BACKGROUND:  Cotrimoxazole (CTX) discontinuation increases malaria incidence in human immunodeficiency virus (HIV)-infected individuals. Rates, quantity, and timing of parasitemia rebound following CTX remain undefined. METHODS:  Serial specimens from a trial of HIV-infected individuals receiving antiretroviral treatment (ART) randomized to continue (the CTX arm) or discontinue (the STOP-CTX arm) were examined for malaria parasites by quantitative reverse transcription polymerase chain reaction (PCR)...
January 1, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28071788/chromosome-inversions-and-ecological-plasticity-in-the-main-african-malaria-mosquitoes
#2
Diego Ayala, Pelayo Acevedo, Marco Pombi, Ibrahima Dia, Daniela Boccolini, Carlo Costantini, Frédéric Simard, Didier Fontenille
Chromosome inversions have fascinated the scientific community, mainly because of their role in the rapid adaption of different taxa to changing environments. However, the ecological traits linked to chromosome inversions have been poorly studied. Here, we investigated the roles played by 23 chromosome inversions in the adaptation of the four major African malaria mosquitoes to local environments in Africa. We studied their distribution patterns by using spatially explicit modeling and characterized the ecogeographical determinants of each inversion range...
January 10, 2017: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/28069653/the-molecular-epidemiology-of-pf-k13-mutations-in-senegal-using-targeted-amplicon-deep-sequencing
#3
Eldin Talundzic, Yaye D Ndiaye, Awa B Deme, Christian Olsen, Dhruviben S Patel, Shweta Biliya, Rachel Daniels, Fredrik O Vannberg, Sarah K Volkman, Venkatachalam Udhayakumar, Daouda Ndiaye
The emergence of Plasmodium falciparum (Pf) resistance to artemisinin in Southeast Asia threatens malaria control and elimination activities worldwide. Multiple polymorphisms in the Pf kelch gene found in chromosome 13 (Pfk13) have been associated with artemisinin resistance. Surveillance of potential drug resistance loci within a population that may emerge under increasing drug pressure is an important public health activity. In this context, P. falciparum infections from an observational surveillance study in Senegal were genotyped using targeted amplicon deep sequencing (TADS) for Pfk13 polymorphisms...
January 9, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28067620/characterisation-of-the-opposing-effects-of-g6pd-deficiency-on-cerebral-malaria-and-severe-malarial-anaemia
#4
Geraldine M Clarke, Kirk Rockett, Katja Kivinen, Christina Hubbart, Anna E Jeffreys, Kate Rowlands, Muminatou Jallow, David J Conway, Kalifa A Bojang, Margaret Pinder, Stanley Usen, Fatoumatta Sisay-Joof, Giorgio Sirugo, Ousmane Toure, Mahamadou A Thera, Salimata Konate, Sibiry Sissoko, Amadou Niangaly, Belco Poudiougou, Valentina D Mangano, Edith C Bougouma, Sodiomon B Sirima, David Modiano, Lucas N Amenga-Etego, Anita Ghansah, Kwadwo A Koram, Michael D Wilson, Anthony Enimil, Jennifer Evans, Olukemi K Amodu, Subulade Olaniyan, Tobias Apinjoh, Regina Mugri, Andre Ndi, Carolyne M Ndila, Sophie Uyoga, Alexander Macharia, Norbert Peshu, Thomas N Williams, Alphaxard Manjurano, Nuno Sepúlveda, Taane G Clark, Eleanor Riley, Chris Drakeley, Hugh Reyburn, Vysaul Nyirongo, David Kachala, Malcolm Molyneux, Sarah J Dunstan, Nguyen Hoan Phu, Nguyen Ngoc Quyen, Cao Quang Thai, Tran Tinh Hien, Laurens Manning, Moses Laman, Peter Siba, Harin Karunajeewa, Steve Allen, Angela Allen, Timothy Me Davis, Pascal Michon, Ivo Mueller, Síle F Molloy, Susana Campino, Angeliki Kerasidou, Victoria J Cornelius, Lee Hart, Shivang S Shah, Gavin Band, Chris Ca Spencer, Tsiri Agbenyega, Eric Achidi, Ogobara K Doumbo, Jeremy Farrar, Kevin Marsh, Terrie Taylor, Dominic P Kwiatkowski
Glucose-6-phosphate dehydrogenase (G6PD) deficiency is believed to confer protection against Plasmodium falciparum malaria, but the precise nature of the protective effecthas proved difficult to define as G6PD deficiency has multiple allelic variants with different effects in males and females, and it has heterogeneous effects on the clinical outcome of P. falciparum infection. Here we report an analysis of multiple allelic forms of G6PD deficiency in a large multi-centre case-control study of severe malaria, using the WHO classification of G6PD mutations to estimate each individual's level of enzyme activity from their genotype...
January 9, 2017: ELife
https://www.readbyqxmd.com/read/28049516/genetic-clustering-and-polymorphism-of-the-merozoite-surface-protein-3-of-plasmodium-knowlesi-clinical-isolates-from-peninsular-malaysia
#5
Jeremy Ryan De Silva, Yee Ling Lau, Mun Yik Fong
BACKGROUND: The simian malaria parasite Plasmodium knowlesi has been reported to cause significant numbers of human infection in South East Asia. Its merozoite surface protein-3 (MSP3) is a protein that belongs to a multi-gene family of proteins first found in Plasmodium falciparum. Several studies have evaluated the potential of P. falciparum MSP3 as a potential vaccine candidate. However, to date no detailed studies have been carried out on P. knowlesi MSP3 gene (pkmsp3). The present study investigates the genetic diversity, and haplotypes groups of pkmsp3 in P...
January 3, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28044042/influence-of-the-pfmdr1-gene-on-in-vitro-sensitivities-of-piperaquine-in-thai-isolates-of-plasmodium-falciparum
#6
Mathirut Mungthin, Ekularn Watanatanasup, Naruemon Sitthichot, Nantana Suwandittakul, Rommanee Khositnithikul, Stephen A Ward
Piperaquine combined with dihydroartemisinin is one of the artemisinin derivative combination therapies, which can replace artesunate-mefloquine in treating uncomplicated falciparum malaria in Thailand. The aim of this study was to determine the in vitro sensitivity of Thai Plasmodium falciparum isolates against piperaquine and the influence of the pfmdr1 gene on in vitro response. One hundred and thirty-seven standard laboratory and adapted Thai isolates of P. falciparum were accessed for in vitro piperaquine sensitivity...
January 2, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28004634/polymorphisms-in-k13-pfcrt-pfmdr1-pfdhfr-and-pfdhps-in-parasites-isolated-from-symptomatic-malaria-patients-in-burkina-faso
#7
Anyirékun Fabrice Somé, Hermann Sorgho, Issaka Zongo, Thomas Bazié, Frédéric Nikiéma, Amadé Sawadogo, Moussa Zongo, Yves-Daniel Compaoré, Jean-Bosco Ouédraogo
BACKGROUND: The emergence of resistance to artemisinin derivatives in western Cambodia is threatening to revert the recent advances made toward global malaria control and elimination. Known resistance-mediating polymorphisms in the K13, pfcrt, pfmdr1, pfdhfr, and pfdhps genes are of greatest importance for monitoring the spread of antimalarial drug resistance. METHODS: Samples for the present study were collected from 244 patients with uncomplicated malaria in health centers of Bobo-Dioulasso, Burkina Faso...
2016: Parasite: Journal de la Société Française de Parasitologie
https://www.readbyqxmd.com/read/28003461/restriction-to-gene-flow-is-associated-with-changes-in-the-molecular-basis-of-pyrethroid-resistance-in-the-malaria-vector-anopheles-funestus
#8
Kayla G Barnes, Helen Irving, Martin Chiumia, Themba Mzilahowa, Michael Coleman, Janet Hemingway, Charles S Wondji
Resistance to pyrethroids, the sole insecticide class recommended for treating bed nets, threatens the control of major malaria vectors, including Anopheles funestus Effective management of resistance requires an understanding of the dynamics and mechanisms driving resistance. Here, using genome-wide transcription and genetic diversity analyses, we show that a shift in the molecular basis of pyrethroid resistance in southern African populations of this species is associated with a restricted gene flow. Across the most highly endemic and densely populated regions in Malawi, An...
December 21, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27999453/frequency-of-tnfa-infg-and-il10-gene-polymorphisms-and-their-association-with-malaria-vivax-and-genomic-ancestry
#9
Adriana Antônia da Cruz Furini, Gustavo Capatti Cassiano, Marcela Petrolini Capobianco, Sidney Emanuel Batista Dos Santos, Ricardo Luiz Dantas Machado
Polymorphisms in cytokine genes can alter the production of these proteins and consequently affect the immune response. The trihybrid heterogeneity of the Brazilian population is characterized as a condition for the use of ancestry informative markers. The objective of this study was to evaluate the frequency of -1031T>C, -308G>A and -238G>A TNFA, +874 A>T IFNG and -819C>T, and -592C>A IL10 gene polymorphisms and their association with malaria vivax and genomic ancestry. Samples from 90 vivax malaria-infected individuals and 51 noninfected individuals from northern Brazil were evaluated...
2016: Mediators of Inflammation
https://www.readbyqxmd.com/read/27998292/genetic-evidence-that-the-makira-region-in-northeastern-madagascar-is-a-hotspot-of-malaria-transmission
#10
Benjamin L Rice, Christopher D Golden, Evelin Jean Gasta Anjaranirina, Carolina Mastella Botelho, Sarah K Volkman, Daniel L Hartl
BACKGROUND: Encouraging advances in the control of Plasmodium falciparum malaria have been observed across much of Africa in the past decade. However, regions of high relative prevalence and transmission that remain unaddressed or unrecognized provide a threat to this progress. Difficulties in identifying such localized hotspots include inadequate surveillance, especially in remote regions, and the cost and labor needed to produce direct estimates of transmission. Genetic data can provide a much-needed alternative to such empirical estimates, as the pattern of genetic variation within malaria parasite populations is indicative of the level of local transmission...
December 20, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27992481/molecular-analysis-of-pfs47-mediated-plasmodium-evasion-of-mosquito-immunity
#11
Gaspar E Canepa, Alvaro Molina-Cruz, Carolina Barillas-Mury
Malaria is a life-threatening disease caused by Plasmodium falciparum parasites that is transmitted through the bites of infected anopheline mosquitoes. P. falciparum dispersal from Africa, as a result of human migration, required adaptation of the parasite to several different indigenous anopheline species. The mosquito immune system can greatly limit infection and P. falciparum evolved a strategy to evade these responses that is mediated by the Pfs47 gene. Pfs47 is a polymorphic gene with signatures of diversifying selection and a strong geographic genetic structure at a continental level...
2016: PloS One
https://www.readbyqxmd.com/read/27959918/the-presence-persistence-and-functional-properties-of-plasmodium-vivax-duffy-binding-protein-ii-antibodies-are-influenced-by-hla-class-ii-allelic-variants
#12
Flora S Kano, Flávia A Souza-Silva, Leticia M Torres, Barbara A S Lima, Taís N Sousa, Jéssica R S Alves, Roberto S Rocha, Cor J F Fontes, Bruno A M Sanchez, John H Adams, Cristiana F A Brito, Douglas E V Pires, David B Ascher, Ana Maria Sell, Luzia H Carvalho
BACKGROUND: The human malaria parasite Plasmodium vivax infects red blood cells through a key pathway that requires interaction between Duffy binding protein II (DBPII) and its receptor on reticulocytes, the Duffy antigen/receptor for chemokines (DARC). A high proportion of P. vivax-exposed individuals fail to develop antibodies that inhibit DBPII-DARC interaction, and genetic factors that modulate this humoral immune response are poorly characterized. Here, we investigate if DBPII responsiveness could be HLA class II-linked...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27940214/extensive-genetic-diversity-among-populations-of-the-malaria-mosquito-anopheles-moucheti-revealed-by-population-genomics
#13
Caroline Fouet, Colince Kamdem, Stephanie Gamez, Bradley J White
Malaria vectors are exposed to intense selective pressures due to large-scale intervention programs that are underway in most African countries. One of the current priorities is therefore to clearly assess the adaptive potential of Anopheline populations, which is critical to understand and anticipate the response mosquitoes can elicit against such adaptive challenges. The development of genomic resources that will empower robust examinations of evolutionary changes in all vectors including currently understudied species is an inevitable step toward this goal...
December 9, 2016: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/27938356/plasmodium-falciparum-genotype-and-gametocyte-prevalence-in-children-with-uncomplicated-malaria-in-coastal-ghana
#14
Ruth Ayanful-Torgby, Akua Oppong, Joana Abankwa, Festus Acquah, Kimberly C Williamson, Linda Eva Amoah
BACKGROUND: Plasmodium falciparum gametocytes are vital to sustaining malaria transmission. Parasite densities, multiplicity of infection as well as asexual genotype are features that have been found to influence gametocyte production. Measurements of the prevalence of Plasmodium sp. gametocytes may serve as a tool to monitor the success of malaria eradication efforts. METHODS: Whole blood was collected from 112 children aged between 6 months and 13 years with uncomplicated P...
December 9, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27933195/cr1-exon-variants-are-associated-with-lowered-cr1-expression-and-increased-susceptibility-to-sle-in-a-plasmodium-falciparum-endemic-population
#15
Aditya K Panda, Balachandran Ravindran, Bidyut K Das
BACKGROUND: Complement receptor 1 (CR1) plays an important role in immune complex clearance by opsonisation and possibly protects subjects from development of autoantibodies. Lower CR1 expression has been associated with susceptibility to systemic lupus erythematosus (SLE). In contrast, subjects displaying lower CR1 expression are protected against severe manifestations of falciparum malaria. This study is the first of its kind to investigate the association of CR1 variants with development of SLE in a P...
2016: Lupus Science & Medicine
https://www.readbyqxmd.com/read/27912758/emerging-polymorphisms-in-falciparum-kelch-13-gene-in-northeastern-region-of-india
#16
Neelima Mishra, Ram Suresh Bharti, Prashant Mallick, Om Prakash Singh, Bina Srivastava, Roma Rana, Sobhan Phookan, Hardev Prasad Gupta, Pascal Ringwald, Neena Valecha
BACKGROUND: Recent reports of emergence and spread of artemisinin resistance in the Southeast Asia region, including Myanmar, pose a greater threat to malaria control and elimination in India. Whole genome sequencing studies have associated mutations in the K13 propeller gene (k13), PF3D7_1343700 with artemisinin resistance both in vitro and in vivo. The aim of the present study was to find the k13 gene polymorphisms in Plasmodium falciparum parasites from the three sites in the Northeast region of India, bordering Bangladesh and Myanmar...
December 3, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27899135/analysis-of-pvama1-genes-from-china-myanmar-border-reveals-little-regional-genetic-differentiation-of-plasmodium-vivax-populations
#17
Xiaotong Zhu, Pan Zhao, Si Wang, Fei Liu, Jun Liu, Jian Wang, Zhaoqing Yang, Guiyun Yan, Qi Fan, Yaming Cao, Liwang Cui
BACKGROUND: With the premise of diminishing parasite genetic diversity following the reduction of malaria incidence, the analysis of polymorphic antigenic markers may provide important information about the impact of malaria control on local parasite populations. Here we evaluated the genetic diversity of Plasmodium vivax apical membrane antigen 1 (Pvama1) gene in a parasite population from the China-Myanmar border and compared it with global P. vivax populations. METHODS: We performed evolutionary analysis to examine the genetic diversity, natural selection, and population differentiation of 73 Pvama1 sequences acquired from the China-Myanmar border as well as 615 publically available Pvama1 sequences from seven global P...
November 29, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27887641/structural-divergence-of-chromosomes-between-malaria-vectors-anopheles-lesteri-and-anopheles-sinensis
#18
Jiangtao Liang, Biao Cheng, Guoding Zhu, Yun Wei, Jianxia Tang, Jun Cao, Yajun Ma, Maria V Sharakhova, Ai Xia, Igor V Sharakhov
BACKGROUND: Anopheles lesteri and Anopheles sinensis are two major malaria vectors in China and Southeast Asia. They are dramatically different in terms of geographical distribution, host preference, resting habitats, and other traits associated with ecological adaptation and malaria transmission. Both species belong to the Anopheles hyrcanus group, but the extent of genetic differences between them is not well understood. To provide an effective way to differentiate between species and to find useful markers for population genetics studies, we performed a comparative cytogenetic analysis of these two malaria vectors...
November 25, 2016: Parasites & Vectors
https://www.readbyqxmd.com/read/27887614/insight-into-k13-propeller-gene-polymorphism-and-ex-vivo-dha-response-profiles-from-cameroonian-isolates
#19
Sandie Menard, Joëlle Njila Tchoufack, Christelle Ngou Maffo, Sandrine E Nsango, Xavier Iriart, Luc Abate, Majoline Tchioffo Tsapi, Parfait H Awono-Ambéné, Francis A Abega Mekongo, Isabelle Morlais, Antoine Berry
BACKGROUND: The spread of Plasmodium falciparum resistance to artemisinin derivatives in Southeast Asia is a major source of concern and the emergence of resistance in Africa would have dramatic consequences, by increasing malaria mortality and morbidity. It is therefore urgent to implement regular monitoring in sentinel sites in sub-Saharan Africa using robust and easy-to-implement tools. The prevalence of k13-propeller mutations and the phenotypic profiles are poorly known in sub-Saharan Africa...
November 26, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27875317/cyp2d6-variability-in-populations-from-venezuela
#20
Nancy Moreno, Carlos Flores-Angulo, Cecilia Villegas, Yuselin Mora
CYP2D6 is an important cytochrome P450 enzyme that plays an important role in the metabolism of about 25% of currently prescribed drugs. The presence of polymorphisms in the CYP2D6 gene may modulate enzyme level and activity, thereby affecting individual responses to pharmacological treatments. The most prevalent diseases in the admixed population from Venezuela are cardiovascular and cancer, whereas viral, bacterial and parasitic diseases, particularly malaria, are prevalent in Amerindian populations; in the treatment of these diseases, several drugs that are metabolized by CYP2D6 are used...
December 1, 2016: Drug Metabolism and Personalized Therapy
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