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https://www.readbyqxmd.com/read/29260656/recombinase-polymerase-amplification-combined-with-a-lateral-flow-strip-for-the-detection-of-plasmodium-knowlesi
#1
Meng-Yee Lai, Choo-Huck Ooi, Yee-Ling Lau
The aim of this study was to develop a recombinase polymerase amplification (RPA) combined with a lateral flow (LF) strip method for specific diagnosis of Plasmodium knowlesi. With incubation at 37°C, the 18S rRNA gene of P. knowlesi was successfully amplified within 12 minutes. By adding a specifically designed probe to the reaction solution, the amplified RPA product can be visualized on a LF strip. The RPA assay exhibited high sensitivity with limits of detection down to 10 parasites/μL of P. knowlesi...
December 18, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29258833/a-reference-genome-and-methylome-for-the-plasmodium-knowlesi-a1-h-1-line
#2
Ernest Diez Benavente, Paola Florez de Sessions, Robert W Moon, Munira Grainger, Anthony A Holder, Michael J Blackman, Cally Roper, Christopher J Drakeley, Arnab Pain, Colin J Sutherland, Martin L Hibberd, Susana Campino, Taane G Clark
Plasmodium knowlesi, a common parasite of macaques, is recognised as a significant cause of human malaria in Malaysia. The P. knowlesi A1H1 line has been adapted to continuous culture in human erythrocytes, successfully providing an in vitro model to study the parasite. We have assembled a reference genome for the PkA1-H.1 line using PacBio long read combined with Illumina short read sequence data. Compared with the H-strain reference, the new reference has improved genome coverage and a novel description of methylation sites...
December 16, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/29247006/a-novel-fluorescence-assay-for-measuring-phosphatidylserine-decarboxylase-catalysis
#3
Jae-Yeon Choi, Yulia V Surovtseva, Sam M Van Sickle, Jan Kumpf, Uwe H F Bunz, Choukri Ben Mamoun, Dennis R Voelker
Phosphatidylserine decarboxylases (PSDs) are central enzymes in phospholipid metabolism that produce phosphatidylethanolamine (PE) in bacteria, protists, plants and animals. We developed a fluorescence-based assay for selectively monitoring production of PE, in reactions using a maltose binding protein fusion with Plasmodium knowlesi PSD (MBP-His6-∆34PkPSD) as the enzyme. The PE detection by fluorescence (λex = 403 nm, λem = 508 nm ) occurred after the lipid reacted with a water soluble distyrylbenzene-bis-aldehyde (DSB-3), and provided strong discrimination against the PS substrate...
December 15, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29144211/plasmodium-knowlesi-experimental-model-zoonotic-pathogen-and-golden-opportunity
#4
Janet Cox-Singh
No abstract text is available yet for this article.
November 16, 2017: Parasitology
https://www.readbyqxmd.com/read/29110664/correction-to-absence-of-plasmodium-inui-and-plasmodium-cynomolgi-but-detection-of-plasmodium-knowlesi-and-plasmodium-vivax-infections-in-asymptomatic-humans-in-the-betong-division-of-sarawak-malaysian-borneo
#5
Angela Siner, Sze-Tze Liew, Khamisah Abdul Kadir, Dayang Shuaisah Awang Mohamad, Felicia Kavita Thomas, Mohammad Zulkarnaen, Balbir Singh
After publication of the article [1], it has been brought to our attention that two of the labels on Figure 4 have transposed. The labels "S-type SSU rRNA" and "A-type SSU rRNA" should be in opposite places.
November 6, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29096194/molecular-interactions-governing-host-specificity-of-blood-stage-malaria-parasites
#6
REVIEW
Erik J Scully, Usheer Kanjee, Manoj T Duraisingh
Non-human primates harbor diverse species of malaria parasites, including the progenitors of Plasmodium falciparum and Plasmodium vivax. Cross-species transmission of some malaria parasites-most notably the macaque parasite, Plasmodium knowlesi-continues to this day, compelling the scientific community to ask whether these zoonoses could impede malaria control efforts by acting as a source of recurrent human infection. Host-restriction varies considerably among parasite species and is governed by both ecological and molecular variables...
October 30, 2017: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/29046610/molecular-epidemiology-of-mosquitoes-for-the-transmission-of-forest-malaria-in-south-central-vietnam
#7
REVIEW
Yoshimasa Maeno
Human infection caused by non-human primate malarial parasites, such as Plasmodium knowlesi and Plasmodium cynomolgi, occurs naturally in Southeast Asian countries, including Vietnam. Members of the Anopheles dirus species complex are known to be important vectors of human malarial parasites in the forested areas of southern and central Vietnam, including those in Khanh Phu commune and Khanh Hoa Province. Recent molecular epidemiological studies in Vietnam have reported cases of co-infection with Plasmodium falciparum, Plasmodium vivax, Plasmodium malariae, and P...
2017: Tropical Medicine and Health
https://www.readbyqxmd.com/read/29041929/absence-of-plasmodium-inui-and-plasmodium-cynomolgi-but-detection-of-plasmodium-knowlesi-and-plasmodium-vivax-infections-in-asymptomatic-humans-in-the-betong-division-of-sarawak-malaysian-borneo
#8
Angela Siner, Sze-Tze Liew, Khamisah Abdul Kadir, Dayang Shuaisah Awang Mohamad, Felicia Kavita Thomas, Mohammad Zulkarnaen, Balbir Singh
BACKGROUND: Plasmodium knowlesi, a simian malaria parasite, has become the main cause of malaria in Sarawak, Malaysian Borneo. Epidemiological data on malaria for Sarawak has been derived solely from hospitalized patients, and more accurate epidemiological data on malaria is necessary. Therefore, a longitudinal study of communities affected by knowlesi malaria was undertaken. METHODS: A total of 3002 blood samples on filter paper were collected from 555 inhabitants of 8 longhouses with recently reported knowlesi malaria cases in the Betong Division of Sarawak, Malaysian Borneo...
October 17, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29020373/artemether-lumefantrine-versus-chloroquine-for-the-treatment-of-uncomplicated-plasmodium-knowlesi-malaria-can-know-an-open-label-randomized-controlled-trial
#9
Matthew J Grigg, Timothy William, Bridget E Barber, Giri S Rajahram, Jayaram Menon, Emma Schimann, Christopher S Wilkes, Kaajal Patel, Arjun Chandna, Ric N Price, Tsin W Yeo, Nicholas M Anstey
Background: Plasmodium knowlesi is reported increasingly across Southeast Asia, and is the commonest cause of malaria in Malaysia. No randomized trials have assessed comparative efficacy of artemether-lumefantrine (AL) for knowlesi malaria. Methods: A randomized-controlled trial was conducted in 3 district hospitals in Sabah, Malaysia to compare the efficacy of AL against chloroquine (CQ) for uncomplicated knowlesi malaria. Participants were included if >10kg, parasitemia <20,000/μL, and had a negative Pf-HRP2 rapid-diagnostic-test...
September 4, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28988930/comparison-of-two-methods-for-transformation-of-plasmodium-knowlesi-direct-schizont-electroporation-and-spontaneous-plasmid-uptake-from-plasmid-loaded-red-blood-cells
#10
Roberto R Moraes Barros, Tyler J Gibson, Whitney A Kite, Juliana M Sá, Thomas E Wellems
Human infections from Plasmodium knowlesi present challenges to malaria control in Southeast Asia. P. knowlesi also offers a model for other human malaria species including Plasmodium vivax. P. knowlesi parasites can be cultivated in the laboratory, and their transformation is standardly performed by direct electroporation of schizont-infected red blood cells (RBCs) with plasmid DNA. Here we show that the efficiency of direct electroporation is exquisitely dependent on developmental age of the schizonts. Additionally, we show that transformation of P...
December 2017: Molecular and Biochemical Parasitology
https://www.readbyqxmd.com/read/28968395/phylogenetic-analysis-of-simian-plasmodium-spp-infecting-anopheles-balabacensis-baisas-in-sabah-malaysia
#11
Tock H Chua, Benny O Manin, Sylvia Daim, Indra Vythilingam, Chris Drakeley
BACKGROUND: Anopheles balabacensis of the Leucospyrus group has been confirmed as the primary knowlesi malaria vector in Sabah, Malaysian Borneo for some time now. Presently, knowlesi malaria is the only zoonotic simian malaria in Malaysia with a high prevalence recorded in the states of Sabah and Sarawak. METHODOLOGY/PRINCIPAL FINDINGS: Anopheles spp. were sampled using human landing catch (HLC) method at Paradason village in Kudat district of Sabah. The collected Anopheles were identified morphologically and then subjected to total DNA extraction and polymerase chain reaction (PCR) to detect Plasmodium parasites in the mosquitoes...
October 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28961865/comparison-of-the-susceptibility-of-plasmodium-knowlesi-and-plasmodium-falciparum-to-antimalarial-agents
#12
Donelly A van Schalkwyk, Robert W Moon, Benjamin Blasco, Colin J Sutherland
Background: The simian malaria parasite Plasmodium knowlesi is now a well-recognized pathogen of humans in South-East Asia. Clinical infections appear adequately treated with existing drug regimens, but the evidence base for this practice remains weak. The availability of P. knowlesi cultures adapted to continuous propagation in human erythrocytes enables specific studies of in vitro susceptibility of the species to antimalarial agents, and could provide a surrogate system for testing investigational compounds against Plasmodium vivax and other non-Plasmodium falciparum infections that cannot currently be propagated in vitro...
November 1, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28947714/analysis-of-polymorphisms-and-selective-pressures-on-ama1-gene-in-plasmodium-knowlesi-isolates-from-sabah-malaysia
#13
Chuen Yang Chua, Ping Chin Lee, Tiek Ying Lau
The apical membrane antigen-1 (AMA-1) of Plasmodium spp. is a merozoite surface antigen that is essential for the recognition and invasion of erythrocytes. Polymorphisms occurring in this surface antigen will cause major obstacles in developing effective malaria vaccines based on AMA-1. The objective of this study was to characterize ama1 gene in Plasmodium knowlesi isolates from Sabah. DNA was extracted from blood samples collected from Keningau, Kota Kinabalu and Kudat. The Pkama1 gene was amplified using nested PCR and subjected to bidirectional sequencing...
September 2017: Journal of Genetics
https://www.readbyqxmd.com/read/28922459/therapeutic-plasma-exchange-in-the-treatment-of-complicated-plasmodium-falciparum-malaria-a-case-report
#14
Tsong-Yih Ou, Cheng-Yen Chuang, Chun-Da Chen, Chung-Yi Cheng
Severe falciparum malaria is associated with multiple organ dysfunction and a high rate of fatal outcome. Malaria is a world-wide disease in tropical areas through the bites of vector mosquitoes. Parasitic protozoans introduced by the mosquito's saliva to the blood travel to the liver then mature and reproduce. In humans, malaria is caused by Plasmodium falciparum, P. malariae, P. ovale, P. vivax, and P. knowlesi, and P. falciparum causes most deaths. Typical malaria symptoms include fever, chills, fatigue, headache, nausea, and vomiting...
September 18, 2017: Journal of Clinical Apheresis
https://www.readbyqxmd.com/read/28922357/analysis-of-nuclear-and-organellar-genomes-of-plasmodium-knowlesi-in-humans-reveals-ancient-population-structure-and-recent-recombination-among-host-specific-subpopulations
#15
Ernest Diez Benavente, Paola Florez de Sessions, Robert W Moon, Anthony A Holder, Michael J Blackman, Cally Roper, Christopher J Drakeley, Arnab Pain, Colin J Sutherland, Martin L Hibberd, Susana Campino, Taane G Clark
The macaque parasite Plasmodium knowlesi is a significant concern in Malaysia where cases of human infection are increasing. Parasites infecting humans originate from genetically distinct subpopulations associated with the long-tailed (Macaca fascicularis (Mf)) or pig-tailed macaques (Macaca nemestrina (Mn)). We used a new high-quality reference genome to re-evaluate previously described subpopulations among human and macaque isolates from Malaysian-Borneo and Peninsular-Malaysia. Nuclear genomes were dimorphic, as expected, but new evidence of chromosomal-segment exchanges between subpopulations was found...
September 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28903726/a-novel-diagnostic-method-for-malaria-using-loop-mediated-isothermal-amplification-lamp-and-minion%C3%A2-nanopore-sequencer
#16
Kazuo Imai, Norihito Tarumoto, Kazuhisa Misawa, Lucky Ronald Runtuwene, Jun Sakai, Kyoko Hayashida, Yuki Eshita, Ryuichiro Maeda, Josef Tuda, Takashi Murakami, Shigefumi Maesaki, Yutaka Suzuki, Junya Yamagishi, Takuya Maeda
BACKGROUND: A simple and accurate molecular diagnostic method for malaria is urgently needed due to the limitations of conventional microscopic examination. In this study, we demonstrate a new diagnostic procedure for human malaria using loop mediated isothermal amplification (LAMP) and the MinION™ nanopore sequencer. METHODS: We generated specific LAMP primers targeting the 18S-rRNA gene of all five human Plasmodium species including two P. ovale subspecies (P...
September 13, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28902417/genetic-variants-related-to-disease-susceptibility-and-immunotolerance-in-the-duffy-antigen-receptor-for-chemokines-darc-fy-gene-in-the-black-lion-tamarin-leontopithecus-chrysopygus-primates
#17
Ashley Ansel, James D Lewis, Don J Melnick, Cristiana Martins, Claudio Valladares-Padua, Beatriz Perez-Sweeney
The DARC (Duffy antigen receptor for chemokines) gene encodes the DARC protein, which serves multiple roles in the immune system, as a binding site for the malarial parasites Plasmodium vivax and Plasmodium knowlesi, a promiscuous chemokine receptor and a blood group antigen. Variation in DARC may play particularly significant roles in innate immunity, immunotolerance and pathogen entry in callitrichines, such as the black lion tamarin (Leontopithecus chrysopygus). We compared amino acid sequences of DARC in the black lion tamarin (BLT) to non-human Haplorhine primates and Homo sapiens...
October 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28863470/effects-of-aging-on-parasite-biomass-inflammation-endothelial-activation-microvascular-dysfunction-and-disease-severity-in-plasmodium-knowlesi-and-plasmodium-falciparum-malaria
#18
Bridget E Barber, Matthew J Grigg, Timothy William, Kim A Piera, Michelle J Boyle, Tsin W Yeo, Nicholas M Anstey
Background: In populations pauci-immune to malaria, risk of severe malaria increases with age. This is particularly apparent in Plasmodium knowlesi malaria. However, pathophysiological mechanisms underlying knowlesi malaria, and of the age-related increase in risk of severe malaria in general, are poorly understood. Methods: In Malaysian patients aged ≥12 years with severe (n = 47) and nonsevere (n = 99) knowlesi malaria, severe (n = 21) and nonsevere (n = 109) falciparum malaria, and healthy controls (n = 50), we measured parasite biomass, systemic inflammation (interleukin 6 [IL-6]), endothelial activation (angiopoietin-2), and microvascular function, and evaluated the effects of age...
June 15, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28820700/rapid-detection-of-plasmodium-knowlesi-by-isothermal-recombinase-polymerase-amplification-assay
#19
Meng-Yee Lai, Choo-Huck Ooi, Yee-Ling Lau
In this study, we developed a recombinase polymerase amplification (RPA) assay for specific diagnosis of Plasmodium knowlesi. Genomic DNA was extracted from whole blood samples using a commercial kit. With incubation at 37°C, the samples were successfully amplified within 20 minutes. The end product of RPA was further examined by loading onto agarose gel and a specific band was observed with a size of 128 bp. The RPA assay exhibited high sensitivity with limits of detection down to one copy of the plasmid...
August 14, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28808204/safety-immunogenicity-and-cross-species-protection-of-a-plasmid-dna-encoding-plasmodium-falciparum-sera5-polypeptide-microbial-epitopes-and-chemokine-genes-in-mice-and-olive-baboons
#20
Nyamongo Onkoba, Ruth M Mumo, Horace Ochanda, Charles Omwandho, Hastings S Ozwara, Thomas G Egwang
Incorporation of biomolecular epitopes to malarial antigens should be explored in the development of strain-transcending malarial vaccines. The present study sought to determine safety, immunogenicity and cross-species efficacy ofPlasmodium falciparum serine repeat antigen 5 polypeptide co-expressed with epitopes of Bacille-Calmette Guerin (BCG), tetanus toxoid (TT) and a chemokine gene. Olive baboons and BALB/c mice were randomly assigned into vaccine and control groups. The vaccine group animals were primed and boosted twice with pIRES plasmids encoding the SERA5+ BCG+ TT alone, or with either CCL5 or CCL20 and the control group with pIRES plasmid vector backbone...
July 13, 2017: Journal of Biomedical Research
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