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https://www.readbyqxmd.com/read/28440745/primaquine-in-plasma-and-methemoglobinemia-in-patients-with-malaria-due-to-plasmodium-vivax-in-the-brazilian-amazon-basin
#1
José Luiz Vieira, Michelle E S Ferreira, Michelle V D Ferreira, Margarete M Gomes
Primaquine is the only licensed drug available for the elimination of Plasmodium vivax hypnozoites. Methemoglobinemia is currently reported in the course of treatment. There is evidence that metabolites of primaquine formed by the cytochrome pathway are responsible for methemoglobin formation; a genetic polymorphism of cytochrome isoforms; and a potential influence of gender in the activities of these enzymes requiring the establishment of dose × response curves profiles in different population groups. Concentrations of primaquine in plasma and methemoglobin levels were investigated in 54 patients with malaria due to P...
April 3, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28427365/association-between-fc%C3%AE-receptor-iia-iiia-and-iiib-genetic-polymorphisms-and-susceptibility-to-severe-malaria-anemia-in-children-in-western-kenya
#2
Elly O Munde, Winnie A Okeyo, Evans Raballah, Samuel B Anyona, Tom Were, John M Ong'echa, Douglas J Perkins, Collins Ouma
BACKGROUND: Naturally-acquired immunity to Plasmodium falciparum malaria develops after several episodes of infection. Fc gamma receptors (FcγRs) bind to immunoglobulin G (IgG) antibodies and mediate phagocytosis of opsonized microbes, thereby, linking humoral and cellular immunity. FcγR polymorphisms influence binding affinity to IgGs and consequently, can influence clinical malaria outcomes. Specifically, variations in FcγRIIA -131Arg/His, FcγRIIIA-176F/V and FcγRIIIB-NA1/NA2 modulate immune responses through altered binding preferences to IgGs and immune complexes...
April 20, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28422980/genetic-and-epigenetic-changes-in-host-abcb1-influences-malaria-susceptibility-to-plasmodium-falciparum
#3
Himanshu Gupta, Sima Chaudhari, Ayushi Rai, Smitha Bhat, Pratima K Sahu, Manjunath H Hande, Sydney C D'Souza, Umakanth Shashikiran, Kapaettu Satyamoorthy
Multiple mechanisms such as genetic and epigenetic variations within a key gene may play a role in malarial susceptibility and response to anti-malarial drugs in the population. ABCB1 is one of the well-studied membrane transporter genes that code for the P-glycoprotein (an efflux protein) and whose effect on malaria disease predisposition and susceptibility to drugs remains to be understood. We studied the association of single nucleotide variations in human ABCB1 that influences its function in subjects with uncomplicated and complicated malaria caused by Plasmodium falciparum (Pf)...
2017: PloS One
https://www.readbyqxmd.com/read/28420422/high-resolution-melting-a-useful-field-deployable-method-to-measure-dhfr-and-dhps-drug-resistance-in-both-highly-and-lowly-endemic-plasmodium-populations
#4
Yaye Dié Ndiaye, Cyrille K Diédhiou, Amy K Bei, Baba Dieye, Aminata Mbaye, Nasserdine Papa Mze, Rachel F Daniels, Ibrahima M Ndiaye, Awa B Déme, Amy Gaye, Mouhamad Sy, Tolla Ndiaye, Aida S Badiane, Mouhamadou Ndiaye, Zul Premji, Dyann F Wirth, Souleymane Mboup, Donald Krogstad, Sarah K Volkman, Ambroise D Ahouidi, Daouda Ndiaye
BACKGROUND: Emergence and spread of drug resistance to every anti-malarial used to date, creates an urgent need for development of sensitive, specific and field-deployable molecular tools for detection and surveillance of validated drug resistance markers. Such tools would allow early detection of mutations in resistance loci. The aim of this study was to compare common population signatures and drug resistance marker frequencies between two populations with different levels of malaria endemicity and history of anti-malarial drug use: Tanzania and Sénégal...
April 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28420399/distinct-parasite-populations-infect-individuals-identified-through-passive-and-active-case-detection-in-a-region-of-declining-malaria-transmission-in-southern-zambia
#5
Kelly M Searle, Ben Katowa, Tamaki Kobayashi, Mwiche N S Siame, Sungano Mharakurwa, Giovanna Carpi, Douglas E Norris, Jennifer C Stevenson, Philip E Thuma, William J Moss
BACKGROUND: Substantial reductions in the burden of malaria have been documented in parts of sub-Saharan Africa, with elimination strategies and goals being formulated in some regions. Within this context, understanding the epidemiology of low-level malaria transmission is crucial to achieving and sustaining elimination. A 24 single-nucleotide-polymorphism Plasmodium falciparum molecular barcode was used to characterize parasite populations from infected individuals identified through passive and active case detection in an area approaching malaria elimination in southern Zambia...
April 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28420389/assessment-of-copy-number-variation-in-genes-related-to-drug-resistance-in-plasmodium-vivax-and-plasmodium-falciparum-isolates-from-the-brazilian-amazon-and-a-systematic-review-of-the-literature
#6
Gabriel Luíz Costa, Lara Cotta Amaral, Cor Jesus Fernandes Fontes, Luzia Helena Carvalho, Cristiana Ferreira Alves de Brito, Taís Nóbrega de Sousa
BACKGROUND: Parasite resistance to anti-malarials represents a great obstacle for malaria elimination. The majority of studies have investigated the association between single-nucleotide polymorphisms (SNPs) and drug resistance; however, it is becoming clear that the copy number variation (CNV) is also associated with this parasite phenotype. To provide a baseline for molecular surveillance of anti-malarial drug resistance in the Brazilian Amazon, the present study characterized the genetic profile of both markers in the most common genes associated with drug resistance in Plasmodium falciparum and Plasmodium vivax isolates...
April 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28388902/therapeutic-efficacy-and-artemisinin-resistance-in-northern-myanmar-evidence-from-in-vivo-and-molecular-marker-studies
#7
Moe Kyaw Myint, Charlotte Rasmussen, Aung Thi, Dorina Bustos, Pascal Ringwald, Khin Lin
BACKGROUND: In Myanmar, three types of artemisinin-based combination therapy (ACT) are recommended as first-line treatment of uncomplicated falciparum malaria: artemether-lumefantrine (AL), artesunate-mefloquine (AS + MQ), and dihydroartemisinin-piperaquine (DP). Resistance to both artemisinins and ACT partner drugs has been reported from the Greater Mekong Sub-region, and regular efficacy monitoring of the recommended ACT is conducted in Myanmar. This paper reports on results from studies to monitor the efficacy of the three forms of ACT in sentinel sites in northern Myanmar, and investigations of mutations in the Kelch13 (k13) propeller domain...
April 7, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28381273/characterization-of-plasmodium-falciparum-genes-associated-with-drug-resistance-in-hodh-elgharbi-a-malaria-hotspot-near-malian-mauritanian-border
#8
Mohamed Salem Ould Ahmedou Salem, Khadijetou Mint Lekweiry, Houssem Bouchiba, Aurelie Pascual, Bruno Pradines, Ali Ould Mohamed Salem Boukhary, Sébastien Briolant, Leonardo K Basco, Hervé Bogreau
BACKGROUND: A malaria hotspot in the southeastern region of Mauritania, near the Malian border, may hamper malaria control strategies. The objectives were to estimate the prevalence of genetic polymorphisms associated with drug resistance in Plasmodium falciparum isolates and establish baseline data. METHODS: The study was conducted in two malaria-endemic areas in Hodh Elgharbi, situated in the Malian-Mauritanian border area. Blood samples were collected from symptomatic patients...
April 5, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28376874/genetic-polymorphisms-in-plasmodium-falciparum-chloroquine-resistance-genes-pfcrt-and-pfmdr1-in-north-sulawesi-indonesia
#9
Patrick Reteng, Visia Vrisca, Inka Sukarno, Ilham Habib Djarkoni, Jane Angela Kalangi, George Eduardo Jacobs, Lucky Ronald Runtuwene, Yuki Eshita, Ryuichiro Maeda, Yutaka Suzuki, Arthur Elia Mongan, Sarah Maria Warouw, Junya Yamagishi, Josef Tuda
BACKGROUND: Malaria still poses one of the major threats to human health. Development of effective antimalarial drugs has decreased this threat; however, the emergence of drug-resistant Plasmodium falciparum, a cause of Malaria, is disconcerting. The antimalarial drug chloroquine has been effectively used, but resistant parasites have spread worldwide. Interestingly, the withdrawal of the drug reportedly leads to an increased population of susceptible parasites in some cases. We examined the prevalence of genomic polymorphisms in a malaria parasite P...
April 4, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28362936/high-frequency-of-blackwater-fever-among-children-presenting-to-hospital-with-severe-febrile-illnesses-in-eastern-uganda
#10
Peter Olupot-Olupot, Charles Engoru, Sophie Uyoga, Rita Muhindo, Alex Macharia, Sarah Kiguli, Robert O Opoka, Samuel Akech, Carolyne Ndila, Richard Nyeko, George Mtove, Julius Nteziyaremye, Martin Chebet, Elizabeth C George, Abdel G Babiker, Diana M Gibb, Thomas N Williams, Kathryn Maitland
Background: In the Fluid Expansion as a Supportive Treatment (FEAST) trial, an unexpectedly high proportion of participants from eastern Uganda presented with blackwater fever (BWF). Methods: We describe the prevalence and outcome of BWF among trial participants and compare the prevalence of 3 malaria-protective red blood cell polymorphisms in BWF cases vs both trial (non-BWF) and population controls. Results: Of 3170 trial participants, 394 (12...
April 1, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28352049/association-of-cd40l-gene-polymorphism-with-severe-plasmodium-falciparum-malaria-in-indian-population
#11
Prasanta Purohit, Pradeep Kumar Mohanty, Siris Patel, Padmalaya Das, Kishalaya Das, Jogeswar Panigrahi
BACKGROUND & OBJECTIVES: Many host genetic factors are associated with the disease severity and fatal outcome of falciparum malaria. CD40L gene has been found to be one of the most important factors associated with malaria in African countries. This study was aimed to investigate the possible association of CD40L gene polymorphism in severe falciparum malaria in Indian adults. METHODS: One hundred fifteen adult cases with severe falciparum malaria were included in the study...
January 2017: Journal of Vector Borne Diseases
https://www.readbyqxmd.com/read/28345264/blood-transcriptomes-and-de-novo-identification-of-candidate-loci-for-mating-success-in-lekking-great-snipe-gallinago-media
#12
Jacob Höglund, Biao Wang, Stein Are Saether, Mozes Pil Kyu Blom, Peder Fiske, Peter Halvarsson, Gavin J Horsburgh, Terry Burke, John Atle Kålås, Robert Ekblom
We assembled the great snipe blood transcriptome using data from fourteen lekking males, in order to de novo identify candidate genes related to sexual selection, and determined the expression profiles in relation to mating success. The three most highly transcribed genes were encoding different haemoglobin subunits. All tended to be overexpressed in males with high mating success. We also called Single Nucleotide Polymorphisms (SNPs) from the transcriptome data and found considerable genetic variation for many genes expressed during lekking...
March 27, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28329160/maternal-microchimerism-predicts-increased-infection-but-decreased-disease-due-to-p-falciparum-during-early-childhood
#13
Whitney E Harrington, Sami B Kanaan, Atis Muehlenbachs, Robert Morrison, Philip Stevenson, Michal Fried, Patrick E Duffy, J Lee Nelson
BACKGROUND: A mother's infection with placental malaria (PM) can affect her child's susceptibility to malaria, although the mechanism remains unclear. The fetus acquires a small amount of maternal cells and DNA known as maternal microchimerism (MMc), and we hypothesized that PM increases MMc and that MMc alters risk of P. falciparum malaria during infancy. METHODS: In a nested cohort from Muheza, Tanzania, we evaluated the presence and level of cord blood MMc in offspring of women with and without PM...
March 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28327148/drug-resistance-mediating-plasmodium-falciparum-polymorphisms-and-clinical-presentations-of-parasitaemic-children-in-uganda
#14
Stephen Tukwasibwe, Patrick Tumwebaze, Melissa Conrad, Emmanuel Arinaitwe, Moses R Kamya, Grant Dorsey, Samuel L Nsobya, Bryan Greenhouse, Philip J Rosenthal
BACKGROUND: Plasmodium falciparum genetic polymorphisms that mediate altered drug sensitivity may impact upon virulence. In a cross-sectional study, Ugandan children with infections mutant at pfcrt K76T, pfmdr1 N86Y, or pfmdr1 D1246Y had about one-fourth the odds of symptomatic malaria compared to those with infections with wild type (WT) sequences. However, results may have been confounded by greater likelihood in those with symptomatic disease of higher density mixed infections and/or recent prior treatment that selected for WT alleles...
March 21, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28288644/tollip-gene-variant-is-associated-with-plasmodium-vivax-malaria-in-the-brazilian-amazon
#15
Larissa W Brasil, Laila R A Barbosa, Felipe J de Araujo, Allyson G da Costa, Luan D O da Silva, Suzana K Pinheiro, Anne C G de Almeida, Andrea Kuhn, Sheila Vitor-Silva, Gisely C de Melo, Wuelton M Monteiro, Marcus V G de Lacerda, Rajendranath Ramasawmy
BACKGROUND: Toll-interacting protein is a negative regulator in the TLR signaling cascade, particularly by impeding the TLR2 and, TLR4 pathway. Recently, TOLLIP was shown to regulate human TLR signaling pathways. Two common TOLLIP polymorphisms (rs5743899 and rs3750920) were reported to be influencing IL-6, TNF and IL-10 expression. In this study, TOLLIP variants were investigated to their relation to Plasmodium vivax malaria in the Brazilian Amazon. METHODS: This cohort study was performed in the municipalities of Careiro and, Manaus, in Western Brazilian Amazon...
March 13, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28288632/unexpected-selections-of-plasmodium-falciparum-polymorphisms-in-previously-treatment-na%C3%A3-ve-areas-after-monthly-presumptive-administration-of-three-different-anti-malarial-drugs-in-liberia-1976-78
#16
Irina T Jovel, Anders Björkman, Cally Roper, Andreas Mårtensson, Johan Ursing
BACKGROUND: To assess the effect on malaria prevalence, village specific monthly administrations of pyrimethamine, chlorproguanil, chloroquine or placebo were given to children in four previously treatment-naïve Liberian villages, 1976-78. Plasmodium falciparum in vivo resistance developed to pyrimethamine only. Selection of molecular markers of P. falciparum resistance after 2 years of treatment are reported. METHODS: Blood samples were collected from 191 study children in a survey in 1978...
March 13, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28274886/increased-susceptibility-of-blood-type-o-individuals-to-develop-anemia-in-plasmodium-vivax-infection
#17
Sarah Stela Resende, Vanessa Gonçalves Milagres, Daniel Gonçalves Chaves, Cor Jesus Fernandes Fontes, Luzia Helena Carvalho, Tais Nobrega Sousa, Cristiana Ferreira Alves de Brito
Plasmodium vivax has been reported to cause severe malaria, and one of the main resulting complications is anemia. Considering that P. vivax infects only young erythrocytes, anemia has been associated with the destruction of infected and non-infected erythrocytes. However, few studies have focused on understanding the relationship between the pathogenesis of P. vivax malaria and human genetic polymorphisms. Although ABO groups seem to influence the outcome of Plasmodium falciparum malaria, the association between P...
March 6, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28264857/the-malaria-taqman-array-card-87-assays-for-plasmodium-falciparum-drug-resistance-speciation-and-genotyping-in-a-single-reaction
#18
Suporn Pholwat, Jie Liu, Suzanne Stroup, Shevin Jacob, Patrick Banura, Christopher Moore, Fang Huang, Miriam Laufer, Eric Houpt, Jennifer Guler
Antimalarial drug resistance exacerbates the global disease burden and complicates eradication efforts. To facilitate the surveillance of resistance markers in malaria-endemic countries, we developed a suite of TaqMan assays for known resistance markers and compartmentalized them into a single array card (TAC). We included 87 assays for species identification, the detection of Plasmodium falciparum mutations associated with chloroquine, atovaquone, pyrimethamine, sulfadoxine, and artemisinin resistance, and neutral single nucleotide polymorphism (SNP) genotyping...
March 6, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28261200/vaccination-with-altered-peptide-ligands-of-a-plasmodium-berghei-circumsporozoite-protein-cd8-t-cell-epitope-a-model-to-generate-t-cells-resistant-to-immune-interference-by-polymorphic-epitopes
#19
Gabriela Minigo, Katie L Flanagan, Robyn M Slattery, Magdalena Plebanski
Many pathogens, including the malaria parasite Plasmodium falciparum, display high levels of polymorphism within T-cell epitope regions of proteins associated with protective immunity. The T-cell epitope variants are often non-cross-reactive. Herein, we show in a murine model, which modifies a protective CD8 T-cell epitope from the circumsporozoite protein (CS) of Plasmodium berghei (SYIPSAEKI), that simultaneous or sequential co-stimulation with two of its putative similarly non-cross-reactive altered peptide ligand (APL) epitopes (SYIPSAEDI or SYIPSAEAI) has radically different effects on immunity...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28237491/homozygosity-for-the-cd1e-02-allele-is-associated-with-a-resistance-to-plasmodium-falciparum-malaria-infection-in-gabonese-school-children
#20
Landry-Erik Mombo, Francine Ntoumi, Cyrille Bisseye, Rajendranath Ramasawmy, Pascal Millet, Ryad Tamouza
OBJECTIVE: To explore the possible association between polymorphisms in CD1 genes and both asymptomatic and mild Plasmodium falciparum infection. METHODS: Two clusters of 85 school children, from the village of Dienga (Gabon) were investigated. The first group was analysed for the prevalence and the multiplicity of asymptomatic P. falciparum infection, whereas the second group was screened for the frequency of malarial attacks. RESULTS: Our findings showed that homozygosity for the CD1E*02 allele was associated with a low frequency of malarial attacks...
February 2017: Asian Pacific Journal of Tropical Medicine
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