Low Levels of Polymorphisms and Negative Selection in Plasmodum knowlesi Merozoite Surface Protein 8 in Malaysian Isolates.

In this study, the level of polymorphisms, haplotypes and natural selection of full-length pkmsp8 in 37 clinical samples from Malaysian Borneo along with 6 lab-adapted strains were investigated. Low levels of polymorphism were observed across the full-length gene, the double epidermal growth factor (EGF) domains were mostly conserved, and non-synonymous substitutions were absent. Evidence of strong negative selection pressure in the non-EGF regions were found indicating functional constrains acting at different domains. Phylogenetic haplotype network analysis identified shared haplotypes and indicated geographical clustering of samples originating from Peninsular Malaysia and Malaysian Borneo. This is the first study to genetically characterize the full-length msp8 gene from clinical isolates of P. knowlesi from Malaysia; however, further functional characterization would be useful for future rational vaccine design. PMID: 31533414 [PubMed - in process]
Source: Korean Journal of Parasitology - Category: Parasitology Tags: Korean J Parasitol Source Type: research

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Conclusions: Naturally acquired sexual stage immunity, as detected by antibodies to Pfs230 and Pfs48/45, was present in most studies analyzed. Significant between-study heterogeneity was seen, and methodological factors were a major contributor to this, and prevented further analysis of epidemiological and biological factors. This demonstrates a need for standardized protocols for conducting and reporting seroepidemiological analyses.
Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
In conclusion, the overall results present the molecular characterization of annexin B30, annexin B5a, annexin B7a and annexin B5b from S. mansoni in host-parasite interactions and strongly suggest that the molecules could be useful candidates for vaccine or diagnostic development.
Source: Molecular and Biochemical Parasitology - Category: Parasitology Source Type: research
Authors: Szuster-Ciesielska A, Wawiórka L, Krokowski D, Grankowski N, Jarosz Ł, Lisiecka U, Tchórzewski M Abstract Malaria remains one the most infectious and destructive protozoan diseases worldwide. Plasmodium falciparum, a protozoan parasite with a complex life cycle and high genetic variability responsible for the difficulties in vaccine development, is implicated in most malaria-related deaths. In the course of study, we prepared a set of antigens based on P-proteins from P. falciparum and determined their immunogenicity in an in vivo assay on a mouse model. The pentameric complex P0-(P1-P2)2 wa...
Source: Journal of Immunology Research - Category: Allergy & Immunology Tags: J Immunol Res Source Type: research
Malaria parasites undergo several stages in their complex lifecycle. To achieve reductions in both the individual disease burden and malaria transmission within communities, a multi-stage malaria vaccine with high effectiveness and durability is a more efficacious strategy compared with a single-stage vaccine. Here, we generated viral-vectored vaccines based on human adenovirus type 5 (AdHu5) and adeno-associated virus serotype 1 (AAV1) expressing a fusion protein of the pre-erythrocytic stage Plasmodium falciparum circumsporozoite protein (PfCSP) and the transmission-blocking sexual stage P25 protein (Pfs25). A two-dose h...
Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
Funding Opportunity RFA-AI-19-059 from the NIH Guide for Grants and Contracts. The purpose of this initiative is to stimulate basic research, discovery, and early translational research to enable and accelerate the generation of highly efficacious pre-erythrocytic stage, sporozoite-based vaccines. Cross-fertilization and collaboration among investigators from malaria vaccine research and other basic research areas such as parasite biology, parasite genomics, pathogenesis, and host immunology are highly encouraged. The goal is to generate one or more promising vaccine candidates against human malaria that exhibit performan...
Source: NIH Funding Opportunities (Notices, PA, RFA) - Category: Research Source Type: funding
Bill Gates told an audience at the University of Cambridge on Monday that global malnutrition will be solved and malaria will be virtually eliminated by 2040 if world leaders choose to fund scientific innovation. Speaking at the Cambridge Union in England, the Microsoft co-founder said: “I’m lucky that my work gives me a view of all the amazing discoveries in the works right now. That’s why I’m able to predict the future.” Gates was named the 2019 recipient of the Professor Hawking Fellowship, founded by the Cambridge Union Society in 2017 in honor of Stephen Hawking’s contribution to t...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized global health Source Type: news
Malaria, a disease caused by parasites of the Plasmodium genus, begins when Plasmodium-infected mosquitoes inject malaria sporozoites while searching for blood. Sporozoites migrate from the skin via blood to the liver, infect hepatocytes, and form liver stages which in mice 48 h later escape into blood and cause clinical malaria. Vaccine-induced activated or memory CD8 T cells are capable of locating and eliminating all liver stages in 48 h, thus preventing the blood-stage disease. However, the rules of how CD8 T cells are able to locate all liver stages within a relatively short time period remains poorly understood. We r...
Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
It may be possible to eradicate malaria—one of history’s deadliest diseases—from the planet by 2050, according to a coalition of 41 leading scientists, economists and health-policy experts writing in the Lancet. “Malaria is one of the oldest and deadliest diseases of humankind,” says Sir Richard Feachem, one of the report’s authors and co-chair of the Lancet commission on malaria eradication. “If we, humankind, were to take on this challenge and eradicate malaria by 2050, it would be an achievement of historic proportions. There would be nothing quite like it.” Malaria, a mos...
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized Infectious Disease onetime Source Type: news
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Source: Proteomics - Category: Biochemistry Authors: Tags: Research Article Source Type: research
Three-year review says new vaccines for eradicating disease are only 40% effectiveMalaria will not be eradicated in the foreseeable future even though it is achievable and would save millions of lives, according to World Health Organization (WHO) experts following a three-year review.The WHO remains committed to the “disappearance of every single malaria parasite from the face of the planet”, as it has been since the UN organisation was launched in 1948, said Dr Pedro Alonso, the director of its global malaria programme.Continue reading...
Source: Guardian Unlimited Science - Category: Science Authors: Tags: World Health Organization Malaria World news Society Science Medicine Medical research Global development Source Type: news
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