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https://www.readbyqxmd.com/read/27912758/emerging-polymorphisms-in-falciparum-kelch-13-gene-in-northeastern-region-of-india
#1
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
#2
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
#3
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
#4
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
#5
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
https://www.readbyqxmd.com/read/27872816/evidence-of-triple-mutant-pfdhps-isgnga-haplotype-in-plasmodium-falciparum-isolates-from-north-east-india-an-analysis-of-sulfadoxine-resistant-haplotype-selection
#6
Manuj K Das, Sumi Chetry, Mohan C Kalita, Prafulla Dutta
BACKGROUND: North-east region of India has consistent role in the spread of multi drug resistant Plasmodium (P.) falciparum to other parts of Southeast Asia. After rapid clinical treatment failure of Artemisinin based combination therapy-Sulphadoxine/Pyrimethamine (ACT-SP) chemoprophylaxis, Artemether-Lumefantrine (ACT-AL) combination therapy was introduced in the year 2012 in this region for the treatment of uncomplicated P. falciparum malaria. In a DNA sequencing based polymorphism analysis, seven codons of P...
December 2016: Genomics Data
https://www.readbyqxmd.com/read/27852258/allele-specific-antibodies-to-plasmodium-vivax-merozoite-surface-protein-1-prevalence-and-inverse-relationship-to-haemoglobin-levels-during-infection
#7
Nuno Sepúlveda, Cristiane Guimarães Morais, Luiza Carvalho Mourão, Matheus França Freire, Cor Jesus F Fontes, Marcus Vinícius G Lacerda, Chris J Drakeley, Érika Martins Braga
BACKGROUND: Antigenic polymorphisms are considered as one of the main strategies employed by malaria parasites to escape from the host immune responses after infections. Merozoite surface protein-1 (MSP-1) of Plasmodium vivax, a promising vaccine candidate, is a highly polymorphic protein whose immune recognition is not well understood. METHODS AND RESULTS: The IgG responses to conserved (MSP-119) and polymorphic (block 2 and block 10) epitopes of PvMSP-1 were evaluated in 141 P...
November 16, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27846879/plasmodium-malariae-and-plasmodium-ovale-infections-in-the-china-myanmar-border-area
#8
Peipei Li, Zhenjun Zhao, Hua Xing, Wenli Li, Xiaotong Zhu, Yaming Cao, Zhaoqing Yang, Jetsumon Sattabongkot, Guiyun Yan, Qi Fan, Liwang Cui
BACKGROUND: The Greater Mekong Subregion is aiming to achieve regional malaria elimination by 2030. Though a shift in malaria parasite species predominance by Plasmodium vivax has been recently documented, the transmission of the two minor Plasmodium species, Plasmodium malariae and Plasmodium ovale spp., is poorly characterized in the region. This study aims to determine the prevalence of these minor species in the China-Myanmar border area and their genetic diversity. METHODS: Epidemiology study was conducted during passive case detection in hospitals and clinics in Myanmar and four counties in China along the China-Myanmar border...
November 15, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27832785/parasitological-correlates-of-plasmodium-ovale-curtisi-and-plasmodium-ovale-wallikeri-infection
#9
Melissa S Phuong, Rachel Lau, Filip Ralevski, Andrea K Boggild
BACKGROUND: Malaria, due to Plasmodium ovale, can be challenging to diagnose due to clinically mild disease and low parasite burden. Two genetically distinct sub-species of P. ovale exist: Plasmodium ovale curtisi (classic) and Plasmodium ovale wallikeri (variant). It is presently unknown if the sub-species causing infection affects performance of malaria diagnostic tests. The aim of this work was to understand how the genetically distinct sub-species, P. o. curtisi and P. o. wallikeri, affect malaria diagnostic tests...
November 10, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27825828/dissecting-malaria-biology-and-epidemiology-using-population-genetics-and-genomics
#10
REVIEW
Sarah Auburn, Alyssa E Barry
Molecular approaches have an increasingly recognized utility in surveillance of malaria parasite populations, not only in defining prevalence and incidence with higher sensitivity than traditional methods, but also in monitoring local and regional parasite transmission patterns. In this review, we provide an overview of population genetic and genomic studies of human-infecting Plasmodium species, highlighting recent advances in the field. In accordance with the renewed impetus for malaria eradication, many studies are now using genetic and genomic epidemiology to support local evidence-based intervention strategies...
November 5, 2016: International Journal for Parasitology
https://www.readbyqxmd.com/read/27825387/plasmodium-vivax-multidrug-resistance-1-gene-polymorphism-in-french-guiana
#11
Emilie Faway, Lise Musset, Stéphane Pelleau, Béatrice Volney, Jessica Casteras, Valérie Caro, Didier Menard, Sébastien Briolant, Eric Legrand
BACKGROUND: Plasmodium vivax malaria is a major public health problem in French Guiana. Some cases of resistance to chloroquine, the first-line treatment used against P. vivax malaria, have been described in the Brazilian Amazon region. The aim of this study is to investigate a possible dispersion of chloroquine-resistant P. vivax isolates in French Guiana. The genotype, polymorphism and copy number variation, of the P. vivax multidrug resistance gene-1 (pvmdr1) have been previously associated with modification of the susceptibility to chloroquine...
November 8, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27821443/altered-plasmodium-falciparum-sensitivity-to-the-antiretroviral-protease-inhibitor-lopinavir-associated-with-polymorphisms-in-pfmdr1
#12
Ebere Sonoiki, Christian Nsanzabana, Jennifer Legac, Kirthana Mysore Vasudevarao Sindhe, Joseph DeRisi, Philip J Rosenthal
The HIV protease inhibitor lopinavir inhibits Plasmodium falciparum aspartic proteases (plasmepsins) and parasite development, and children receiving lopinavir-ritonavir experienced fewer episodes of malaria than those receiving other antiretroviral regimens. Resistance to lopinavir was selected in vitro over ∼9 months, with ∼4-fold decreased sensitivity. Whole genome sequencing of resistant parasites showed a mutation and increased copy number in pfmdr1, a mutation in a protein of unknown function, but no polymorphisms in plasmepsin genes...
November 7, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27821442/critical-evaluation-of-molecular-monitoring-in-malaria-drug-efficacy-trials-pitfalls-of-length-polymorphic-markers
#13
Camilla Messerli, Natalie E Hofmann, Hans-Peter Beck, Ingrid Felger
Estimating drug efficacy in antimalarial drug trials requires parasite genotyping to distinguish new infections from treatment failures. When using length-polymorphic molecular markers, preferential amplification of short fragments can compromise detection of co-infections, potentially leading to misclassification of treatment outcome. We quantified minority clone detectability and competition among msp1, msp2, and glurp amplicons using mixtures of P. falciparum strains and investigated the impact of template competition on genotyping outcomes in forty-four paired field samples...
November 7, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27821166/limited-genetic-diversity-in-the-pvk12-kelch-protein-in-plasmodium-vivax-isolates-from-southeast-asia
#14
Meilian Wang, Faiza Amber Siddiqui, Qi Fan, Enjie Luo, Yaming Cao, Liwang Cui
BACKGROUND: Artemisinin resistance in Plasmodium falciparum has emerged as a major threat for malaria control and elimination worldwide. Mutations in the Kelch propeller domain of PfK13 are the only known molecular markers for artemisinin resistance in this parasite. Over 100 non-synonymous mutations have been identified in PfK13 from various malaria endemic regions. This study aimed to investigate the genetic diversity of PvK12, the Plasmodium vivax ortholog of PfK13, in parasite populations from Southeast Asia, where artemisinin resistance in P...
November 8, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27818097/a-surrogate-marker-of-piperaquine-resistant-plasmodium-falciparum-malaria-a-phenotype-genotype-association-study
#15
Benoit Witkowski, Valentine Duru, Nimol Khim, Leila S Ross, Benjamin Saintpierre, Johann Beghain, Sophy Chy, Saorin Kim, Sopheakvatey Ke, Nimol Kloeung, Rotha Eam, Chanra Khean, Malen Ken, Kaknika Loch, Anthony Bouillon, Anais Domergue, Laurence Ma, Christiane Bouchier, Rithea Leang, Rekol Huy, Grégory Nuel, Jean-Christophe Barale, Eric Legrand, Pascal Ringwald, David A Fidock, Odile Mercereau-Puijalon, Frédéric Ariey, Didier Ménard
BACKGROUND: Western Cambodia is the epicentre of Plasmodium falciparum multidrug resistance and is facing high rates of dihydroartemisinin-piperaquine treatment failures. Genetic tools to detect the multidrug-resistant parasites are needed. Artemisinin resistance can be tracked using the K13 molecular marker, but no marker exists for piperaquine resistance. We aimed to identify genetic markers of piperaquine resistance and study their association with dihydroartemisinin-piperaquine treatment failures...
November 3, 2016: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/27818095/genetic-markers-associated-with-dihydroartemisinin-piperaquine-failure-in-plasmodium-falciparum-malaria-in-cambodia-a-genotype-phenotype-association-study
#16
Roberto Amato, Pharath Lim, Olivo Miotto, Chanaki Amaratunga, Dalin Dek, Richard D Pearson, Jacob Almagro-Garcia, Aaron T Neal, Sokunthea Sreng, Seila Suon, Eleanor Drury, Dushyanth Jyothi, Jim Stalker, Dominic P Kwiatkowski, Rick M Fairhurst
BACKGROUND: As the prevalence of artemisinin-resistant Plasmodium falciparum malaria increases in the Greater Mekong subregion, emerging resistance to partner drugs in artemisinin combination therapies seriously threatens global efforts to treat and eliminate this disease. Molecular markers that predict failure of artemisinin combination therapy are urgently needed to monitor the spread of partner drug resistance, and to recommend alternative treatments in southeast Asia and beyond. METHODS: We did a genome-wide association study of 297 P falciparum isolates from Cambodia to investigate the relationship of 11 630 exonic single-nucleotide polymorphisms (SNPs) and 43 copy number variations (CNVs) with in-vitro piperaquine 50% inhibitory concentrations (IC50s), and tested whether these genetic variants are markers of treatment failure with dihydroartemisinin-piperaquine...
November 3, 2016: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/27816495/simple-detection-of-single-nucleotide-polymorphism-in-plasmodium-falciparum-by-snp-lamp-assay-combined-with-lateral-flow-dipstick
#17
Suganya Yongkiettrakul, Jantana Kampeera, Wanwisa Chareanchim, Roonglawan Rattanajak, Wichai Pornthanakasem, Wansika Kiatpathomchai, Darin Kongkasuriyachai
The significant strides made in reducing global malaria burden over the past decades are being threatened by the emergence of multi-drug resistant malaria. Mechanisms of resistance to several classes of antimalarial drugs have been linked to key mutations in the Plasmodium falciparum genes. Pyrimethamine targets the dihydrofolate reductase of the bifunctional dihydrofolate reductase thymidylate synthase (DHFR-TS), and specific point mutations in the dhfr-ts gene have been assigned to resistant phenotypes. Several molecular methods are available to detect the mutant genotypes including DNA sequencing and PCR-based methods...
November 2, 2016: Parasitology International
https://www.readbyqxmd.com/read/27809837/genetic-diversity-of-the-pvk12-gene-in-plasmodium-vivax-from-the-china-myanmar-border-area
#18
Shuang Deng, Yonghua Ruan, Yao Bai, Yue Hu, Zeshuai Deng, Yongshu He, Rui Ruan, Yanrui Wu, Zhaoqing Yang, Liwang Cui
BACKGROUND: Plasmodium falciparum resistance to artemisinin emerged in the Greater Mekong Sub-region has been associated with mutations in the propeller domain of the kelch gene Pfk13. METHODS: Here the polymorphisms in Pvk12 gene, the orthologue of Pfk13 in Plasmodium vivax, were determined by PCR and sequencing in 262 clinical isolates collected in recent years (2012-2015) from the China-Myanmar border area. RESULTS: Sequencing of full-length Pvk12 genes from these isolates identified three synonymous mutations (N172N, S360S, S697S) and one non-synonymous mutation M124I, all of which were at very low prevalence (2...
November 4, 2016: Malaria Journal
https://www.readbyqxmd.com/read/27799638/longitudinal-pooled-deep-sequencing-of-the-plasmodium-vivax-k12-kelch-gene-in-cambodia-reveals-a-lack-of-selection-by-artemisinin
#19
Nicholas F Brazeau, Nicholas Hathaway, Christian M Parobek, Jessica T Lin, Jeffrey A Bailey, Chanthap Lon, David L Saunders, Jonathan J Juliano
The emergence of artemisinin resistance among Plasmodium falciparum in the Greater Mekong subregion threatens malaria control interventions and is associated with multiple unique mutations in K13 (PF3D7_1343700). The aim of this study was to survey Cambodian Plasmodium vivax for mutations in the K13 ortholog (K12, PVX_083080) that might similarly confer artemisinin resistance. Extracted DNA from Cambodian isolates collected between 2009 and 2012 was pooled by province and year and submitted for next-generation sequencing...
October 31, 2016: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/27788228/prevalence-of-plasmodium-falciparum-molecular-markers-of-antimalarial-drug-resistance-in-a-residual-malaria-focus-area-in-sabah-malaysia
#20
Nor Azrina Norahmad, Mohd Ridzuan Mohd Abd Razak, Noor Rain Abdullah, Umi Rubiah Sastu, Mallika Imwong, Prem Kumar Muniandy, Muhammad Nor Farhan Saat, Amirrudin Muhammad, Jenarun Jelip, Moizin Tikuson, Norsalleh Yusof, Christina Rundi, Rose Nani Mudin, Ami Fazlin Syed Mohamed
Chloroquine (CQ) and fansidar (sulphadoxine-pyrimethamine, SP) were widely used for treatment of Plasmodium falciparum for several decades in Malaysia prior to the introduction of Artemisinin-based Combination Therapy (ACT) in 2008. Our previous study in Kalabakan, located in south-east coast of Sabah showed a high prevalence of resistance to CQ and SP, suggesting the use of the treatment may no longer be effective in the area. This study aimed to provide a baseline data of antimalarial drug resistant markers on P...
2016: PloS One
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