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https://www.readbyqxmd.com/read/29342401/matched-placental-and-circulating-plasmodium-falciparum-parasites-are-genetically-homologous-at-the-var2csa-id1-dbl2x-locus-by-deep-sequencing
#1
Andreea Waltmann, Jaymin C Patel, Kyaw L Thwai, Nicholas J Hathaway, Christian M Parobek, Achille Massougbodji, Nadine Fievet, Jeffery A Bailey, Philippe Deloron, Jonathan J Juliano, Nicaise Tuikue Ndam, Steven R Meshnick
In pregnancy-associated malaria, infected erythrocytes accumulate in the placenta. It is unclear if in polyclonal infections this results in distinct peripheral and placental parasite populations. We used long amplicon deep sequencing of Plasmodium falciparum var2csa ID1-DBL2X from 15 matched peripheral and placental samples collected at delivery from a high transmission area to determine genetic homology. Despite substantial sequence variation and detecting 23 haplotypes, the matched pairs mostly contained the same genetic variants, with 11 pairs sharing 100% of their variants, whereas others showed some heterogeneity...
January 2018: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29334942/poor-response-to-artesunate-treatment-in-two-patients-with-severe-malaria-on-the-thai-myanmar-border
#2
Aung Pyae Phyo, Kyaw Kyaw Win, Aung Myint Thu, Lei Lei Swe, Htike Htike, Candy Beau, Kanlaya Sriprawat, Markus Winterberg, Stephane Proux, Mallika Imwong, Elizabeth A Ashley, Francois Nosten
BACKGROUND: Malaria has declined dramatically along the Thai-Myanmar border in recent years due to malaria control and elimination programmes. However, at the same time, artemisinin resistance has spread, raising concerns about the efficacy of parenteral artesunate for the treatment of severe malaria. CASE PRESENTATION: In November 2015 and April 2017, two patients were treated for severe malaria with parenteral artesunate. Quinine was added within 24 h due to an initial poor response to treatment...
January 15, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29332155/prevalence-of-the-pfdhfr-and-pfdhps-mutations-among-asymptomatic-pregnant-women-in-southeast-nigeria
#3
Ekpereonne Esu, Costanza Tacoli, Prabhanjan Gai, Nicole Berens-Riha, Michael Pritsch, Thomas Loescher, Martin Meremikwu
Sulfadoxine-pyrimethamine (SP) is the recommended drug for intermittent preventive treatment of malaria in pregnancy in most of sub-Saharan Africa. Resistance to SP is related to mutations in the dhfr and dhps gene of Plasmodium falciparum. This study determined the prevalence of Pfdhfr and Pfdhps polymorphisms found in asymptomatic pregnant women attending antenatal care in Calabar, Nigeria. From October 2013 to November 2014, asymptomatic pregnant women attending antenatal care clinics were enrolled after obtaining informed consent...
January 13, 2018: Parasitology Research
https://www.readbyqxmd.com/read/29325146/dramatic-changes-in-malaria-population-genetic-complexity-in-dielmo-and-ndiop-senegal-revealed-using-genomic-surveillance
#4
Amy K Bei, Makhtar Niang, Awa B Deme, Rachel F Daniels, Fatoumata D Sarr, Cheikh Sokhna, Cheikh Talla, Joseph Faye, Nafissatou Diagne, Souleymane Doucoure, Souleymane Mboup, Dyann F Wirth, Adama Tall, Daouda Ndiaye, Daniel L Hartl, Sarah K Volkman, Aissatou Toure-Balde
Dramatic changes in transmission intensity can impact Plasmodium population diversity. Using samples from 2 distant time-points in the Dielmo/Ndiop longitudinal cohorts from Senegal, we applied a molecular barcode tool to detect changes in parasite genotypes and complexity of infection that corresponded to changes in transmission intensity. We observed a striking statistically significant difference in genetic diversity between the 2 parasite populations. Furthermore, we identified a genotype in Dielmo and Ndiop previously observed in Thiès, potentially implicating imported malaria...
January 9, 2018: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29321052/asgdb-a-specialised-genomic-resource-for-interpreting-anopheles-sinensis-insecticide%C3%A2-resistance
#5
Dan Zhou, Yang Xu, Cheng Zhang, Meng-Xue Hu, Yun Huang, Yan Sun, Lei Ma, Bo Shen, Chang-Liang Zhu
BACKGROUND: Anopheles sinensis is an important malaria vector in Southeast Asia. The widespread emergence of insecticide resistance in this mosquito species poses a serious threat to the efficacy of malaria control measures, particularly in China. Recently, the whole-genome sequencing and de novo assembly of An. sinensis (China strain) has been finished. A series of insecticide-resistant studies in An. sinensis have also been reported. There is a growing need to integrate these valuable data to provide a comprehensive database for further studies on insecticide-resistant management of An...
January 10, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29304805/status-of-insecticide-resistance-in-malaria-vectors-in-kwale-county-coastal-kenya
#6
Caroline W Kiuru, Florence Awino Oyieke, Wolfgang Richard Mukabana, Joseph Mwangangi, Luna Kamau, Damaris Muhia-Matoke
BACKGROUND: The strategy for malaria vector control in the context of reducing malaria morbidity and mortality has been the scale-up of long-lasting insecticidal nets to universal coverage and indoor residual spraying. This has led to significant decline in malaria transmission. However, these vector control strategies rely on insecticides which are threatened by insecticide resistance. In this study the status of pyrethroid resistance in malaria vectors and it's implication in malaria transmission at the Kenyan Coast was investigated...
January 5, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29298698/genotype-and-biotype-of-invasive-anopheles-stephensi-in-mannar-island-of-sri-lanka
#7
Sinnathamby N Surendran, Kokila Sivabalakrishnan, Kanapathy Gajapathy, Sivasingham Arthiyan, Tibutius T P Jayadas, Kalingarajah Karvannan, Selvarajah Raveendran, S H P Parakrama Karunaratne, Ranjan Ramasamy
BACKGROUND: Anopheles stephensi, the major vector of urban malaria in India, was recently detected for the first time in Sri Lanka in Mannar Island on the northwestern coast. Since there are different biotypes of An. stephensi with different vector capacities in India, a study was undertaken to further characterise the genotype and biotype of An. stephensi in Mannar Island. METHODS: Mosquito larvae were collected in Pesalai village in Mannar and maintained in the insectary until adulthood...
January 3, 2018: Parasites & Vectors
https://www.readbyqxmd.com/read/29291234/a-clinical-report-on-mixed-infection-of-malaria-dengue-and-chikungunya-from-new-delhi-india
#8
Mohd Abdullah, Ayesha Tazeen, Malik Hisamuddin, Irshad H Naqvi, Hirday N Verma, Anwar Ahmed, Shama Parveen
Arthropod-borne infections like malaria, dengue and chikungunya fever are transmitted by mosquitoes. The present report describes an unusual case of mixed infection with malaria, dengue and chikungunya viruses in a 21 year old male patient from New Delhi, India during monsoon season of 2016. The malarial fever was diagnosed by thin slide microscopy and antigen test. Chikungunya virus IgM was detected in the sample by the card test. Dengue and chikungunya viruses were further confirmed by RT-PCR for CprM and E1 gene respectively...
December 2017: Virusdisease
https://www.readbyqxmd.com/read/29281988/intravenous-artesunate-plus-artemisnin-based-combination-therapy-act-or-intravenous-quinine-plus-act-for-treatment-of-severe-malaria-in-ugandan-children-a-randomized-controlled-clinical-trial
#9
Pauline Byakika-Kibwika, Jane Achan, Mohammed Lamorde, Carine Karera-Gonahasa, Agnes N Kiragga, Harriet Mayanja-Kizza, Noah Kiwanuka, Sam Nsobya, Ambrose O Talisuna, Concepta Merry
BACKGROUND: Severe malaria is a medical emergency associated with high mortality. Adequate treatment requires initial parenteral therapy for fast parasite clearance followed by longer acting oral antimalarial drugs for cure and prevention of recrudescence. METHODS: In a randomized controlled clinical trial, we evaluated the 42-day parasitological outcomes of severe malaria treatment with intravenous artesunate (AS) or intravenous quinine (QNN) followed by oral artemisinin based combination therapy (ACT) in children living in a high malaria transmission setting in Eastern Uganda...
December 28, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29279840/pro-inflammatory-cytokine-response-and-genetic-diversity-in-merozoite-surface-protein-2-of-plasmodium-falciparum-isolates-from-nigeria
#10
Olusola Ajibaye, Akinniyi A Osuntoki, Albert Ot Ebuehi, Bamidele A Iwalokun, Emmanuel O Balogun, Kathleen N Egbuna
Background: Polymorphisms in Plasmodium falciparum merozoite surface protein-2 (msp-2) and associated parasite genetic diversity which varies between malaria-endemic regions remain a limitation in malaria vaccine development. Pro-inflammatory cytokines are important in immunity against malaria, understanding the influence of genetic diversity on cytokine response is important for effective vaccine design. Methods: P. falciparum isolates obtained from 300 Nigerians with uncomplicated falciparum malaria at Ijede General Hospital, Ijede (IJE), General Hospital Ajeromi, Ajeromi (AJE) and Saint Kizito Mission Hospital, Lekki, were genotyped by nested polymerase chain reaction of msp-2 block 3 while ELISA was used to determine the pro-inflammatory cytokine response to describe the genetic diversity of P...
2017: Advanced Biomedical Research
https://www.readbyqxmd.com/read/29260711/inferring-genetic-interactions-from-comparative-fitness-data
#11
Kristina Crona, Alex Gavryushkin, Devin Greene, Niko Beerenwinkel
Darwinian fitness is a central concept in evolutionary biology. In practice, however, it is hardly possible to measure fitness for all genotypes in a natural population. Here, we present quantitative tools to make inferences about epistatic gene interactions when the fitness landscape is only incompletely determined due to imprecise measurements or missing observations. We demonstrate that genetic interactions can often be inferred from fitness rank orders, where all genotypes are ordered according to fitness, and even from partial fitness orders...
December 20, 2017: ELife
https://www.readbyqxmd.com/read/29259931/bone-marrow-necrosis-and-fat-embolism-syndrome-a-dreadful-complication-of-hemoglobin-sickle-cell-disease
#12
Eduardo Pelegrineti Targueta, André Carramenha de Góes Hirano, Fernando Peixoto Ferraz de Campos, João Augusto Dos Santos Martines, Silvana Maria Lovisolo, Aloisio Felipe-Silva
Sickle cell disease encompasses a wide range of genotypic presentation with particular clinical features. The entity affects millions of people, particularly those whose ancestors came from sub-Saharan Africa and other countries in the Western Hemisphere, Saudi Arabia, and India. Currently, the high frequency of S and C genes reflects natural selection through the protection of heterozygotes against severe malaria, the high frequency of consanguineous marriages, improvement of some public health policies and the nutritional standards in the poorer countries where newborns are now living long enough to present for diagnosis and management...
October 2017: Autopsy & Case Reports
https://www.readbyqxmd.com/read/29251006/prevalence-of-thalassemia-and-glucose-6-phosphate-dehydrogenase-deficiency-in-newborns-and-adults-at-the-ramathibodi-hospital-bangkok-thailand
#13
Wansa Banyatsuppasin, Sumalee Jindadamrongwech, Anchalee Limrungsikul, Punnee Butthep
Thalassemias and glucose-6-phosphate dehydrogenase (G6PD) deficiency are the most common inherited blood disorders. They are distributed among populations living in malaria endemic regions resulting in survival advantage from severe malaria disease. The aims of this study were to analyze the prevalence of thalassemias and G6PD deficiency at the Ramathibodi Hospital, Bangkok, Thailand. A total of 616 adult and 174 cord blood samples were collected and analyzed for red blood cell (RBC) parameters, hemoglobin (Hb) typing and DNA analysis for G6PD mutations and α-thalassemia (α-thal)...
December 18, 2017: Hemoglobin
https://www.readbyqxmd.com/read/29192183/prevalence-of-mutations-linked-to-antimalarial-resistance-in-plasmodium-falciparum-from-chhattisgarh-central-india-a-malaria-elimination-point-of-view
#14
Priyanka Patel, Praveen K Bharti, Devendra Bansal, Nazia A Ali, Rajive K Raman, Pradyumna K Mohapatra, Rakesh Sehgal, Jagadish Mahanta, Ali A Sultan, Neeru Singh
Antimalarial drug resistance is a major global challenge in malaria control and elimination. Mutations in six different genes of Plasmodium falciparum (crt, mdr1, dhfr, dhps, ATPase6 and K-13 propeller) that confer resistance to chloroquine, sulphadoxine-pyrimethamine and artemisinin-based combination therapy were analyzed in samples from Chhattisgarh. Seventy-eight percent of the samples were found to have a pfcrt mutation (53% double, 24% triple and 1% single mutant), and 59% of pfmdr1 genes were found to have an N86Y mutation...
November 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29181452/prevalences-of-inherited-red-blood-cell-disorders-in-pregnant-women-of-different-ethnicities-living-along-the-thailand-myanmar-border
#15
Germana Bancone, Mary Ellen Gilder, Nongnud Chowwiwat, Gornpan Gornsawun, Elsi Win, Win Win Cho, Eh Moo, Aung Myat Min, Prakaykaew Charunwatthana, Verena I Carrara, Nicholas J White, Francois Nosten, Rose McGready
Background: Inherited red blood cell disorders are prevalent in populations living in malaria endemic areas; G6PD deficiency is associated with oxidant-induced haemolysis and abnormal haemoglobin variants may cause chronic anaemia. In pregnant women, microcytic anaemia caused by haemoglobinopathies mimics iron deficiency, complicating diagnosis and treatment. Anaemia during pregnancy is associated with morbidity and mortality. The aim of this study was to characterise the prevalence of G6PD deficiency and haemoglobinopathies  among the pregnant population living along the Thailand-Myanmar border...
2017: Wellcome Open Research
https://www.readbyqxmd.com/read/29175392/genetic-ancestry-effects-on-the-distribution-of-toll-like-receptors-tlrs-gene-polymorphisms-in-a-population-of-the-atlantic-forest-s%C3%A3-o-paulo-brazil
#16
Lilian O Guimarães, Miklos Maximiliano Bajay, Eliana F Monteiro, Gerhard Wunderlich, Sidney E Santos, Karin Kirchgatter
The innate immune system governed by toll-like receptors (TLRs) provides the first line of defense against pathogens. Surface-localized TLR1 and TLR6 are known to detect parasite components. TLR encoding genes were shown to display signatures of recent positive selection in Europeans and might be involved in local adaptation at immune-related genes. To verify the influence of Brazilian population admixture on the distribution of polymorphisms in TLRs, we analyzed the genotype frequencies of 24 polymorphisms distributed across five TLR genes in a Southeastern Brazilian population where autochthonous cases of malaria occur in small foci of transmission...
November 23, 2017: Human Immunology
https://www.readbyqxmd.com/read/29168218/the-clinical-epidemiology-of-sickle-cell-anemia-in-africa
#17
Alex W Macharia, George Mochamah, Sophie Uyoga, Carolyne M Ndila, Gideon Nyutu, Johnstone Makale, Metrine Tendwa, Emily Nyatichi, John Ojal, Mohammed Shebe, Kennedy O Awuondo, Neema Mturi, Norbert Peshu, Benjamin Tsofa, J Anthony G Scott, Kathryn Maitland, Thomas N Williams
Sickle cell anemia (SCA) is the commonest severe monogenic disorders of humans. The disease has been highly characterized in high-income countries but not in sub-Saharan Africa where SCA is most prevalent. We conducted a retrospective cohort study of all children 0-13 years admitted from within a defined study area to Kilifi County Hospital in Kenya over a five-year period. Children were genotyped for SCA retrospectively and incidence rates calculated with reference to population data. Overall, 576 of 18,873 (3...
November 23, 2017: American Journal of Hematology
https://www.readbyqxmd.com/read/29162100/host-age-and-plasmodium-falciparum-multiclonality-are-associated-with-gametocyte-prevalence-a-1-year-prospective-cohort-study
#18
Yaw Adomako-Ankomah, Matthew S Chenoweth, Aaron M Tocker, Saibou Doumbia, Drissa Konate, Mory Doumbouya, Abdoul S Keita, Jennifer M Anderson, Rick M Fairhurst, Mahamadou Diakite, Kazutoyo Miura, Carole A Long
BACKGROUND: Since Plasmodium falciparum transmission relies exclusively on sexual-stage parasites, several malaria control strategies aim to disrupt this step of the life cycle. Thus, a better understanding of which individuals constitute the primary gametocyte reservoir within an endemic population, and the temporal dynamics of gametocyte carriage, especially in seasonal transmission settings, will not only support the effective implementation of current transmission control programmes, but also inform the design of more targeted strategies...
November 21, 2017: Malaria Journal
https://www.readbyqxmd.com/read/29141760/glucose-6-phosphate-dehydrogenase-deficiency-genetic-variants-in-malaria-patients-in-southwestern-ethiopia
#19
Tamar E Carter, Seleshi Kebede Mekonnen, Karen Lopez, Victoria Bonnell, Lambodhar Damodaran, Abraham Aseffa, Daniel A Janies
Glucose-6-phosphate dehydrogenase (G6PD) deficiency is an X-linked erythrocyte enzyme disorder with relevance to malaria treatment policy. Treatment with the antimalarial primaquine can result in hemolytic anemia in G6PD-deficient patients. With increased interest in primaquine use, it is important to identify G6PD variants in Ethiopia to inform malaria treatment policy. In the present study, mutations in the G6PD gene are identified in a sample of patients with malaria in Jimma town in southwest Ethiopia. Plasmodium species of infection were confirmed using polymerase chain reaction (PCR) and gel electrophoresis...
October 30, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29141719/chloroquine-primaquine-versus-chloroquine-alone-to-treat-vivax-malaria-in-afghanistan-an-open-randomized-superiority-trial
#20
Ghulam Rahim Awab, Mallika Imwong, Germana Bancone, Atthanee Jeeyapant, Nicholas P J Day, Nicholas J White, Charles J Woodrow
Afghanistan's national guidelines recommend primaquine (PQ) for radical treatment of Plasmodium vivax malaria, but this is rarely implemented because of concerns over potential hemolysis in patients who have G6PD deficiency. Between August 2009 and February 2014, we conducted an open-label, randomized controlled trial of chloroquine (CQ) alone versus chloroquine plus primaquine (0.25 mg base/kg/day for 14 days) (CQ+PQ) in patients aged 6 months and older with microscopy confirmed P. vivax infection. In the CQ+PQ group, G6PD deficiency was excluded by fluorescent spot testing...
October 30, 2017: American Journal of Tropical Medicine and Hygiene
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