Immune evasion by malaria parasites: a challenge for vaccine development

2009 ◽  
Vol 21 (3) ◽  
pp. 321-330 ◽  
Author(s):  
Sofia Casares ◽  
Thomas L Richie
BMC Genomics ◽  
2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Cui Zhang ◽  
Cihan Oguz ◽  
Sue Huse ◽  
Lu Xia ◽  
Jian Wu ◽  
...  

Abstract Background Rodent malaria parasites are important models for studying host-malaria parasite interactions such as host immune response, mechanisms of parasite evasion of host killing, and vaccine development. One of the rodent malaria parasites is Plasmodium yoelii, and multiple P. yoelii strains or subspecies that cause different disease phenotypes have been widely employed in various studies. The genomes and transcriptomes of several P. yoelii strains have been analyzed and annotated, including the lethal strains of P. y. yoelii YM (or 17XL) and non-lethal strains of P. y. yoelii 17XNL/17X. Genomic DNA sequences and cDNA reads from another subspecies P. y. nigeriensis N67 have been reported for studies of genetic polymorphisms and parasite response to drugs, but its genome has not been assembled and annotated. Results We performed genome sequencing of the N67 parasite using the PacBio long-read sequencing technology, de novo assembled its genome and transcriptome, and predicted 5383 genes with high overall annotation quality. Comparison of the annotated genome of the N67 parasite with those of YM and 17X parasites revealed a set of genes with N67-specific orthology, expansion of gene families, particularly the homologs of the Plasmodium chabaudi erythrocyte membrane antigen, large numbers of SNPs and indels, and proteins predicted to interact with host immune responses based on their functional domains. Conclusions The genomes of N67 and 17X parasites are highly diverse, having approximately one polymorphic site per 50 base pairs of DNA. The annotated N67 genome and transcriptome provide searchable databases for fast retrieval of genes and proteins, which will greatly facilitate our efforts in studying the parasite biology and gene function and in developing effective control measures against malaria.


Vaccines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1409
Author(s):  
Wasim A. Prates-Syed ◽  
Lorena C. S. Chaves ◽  
Karin P. Crema ◽  
Larissa Vuitika ◽  
Aline Lira ◽  
...  

Virus-like particles (VLPs) are a versatile, safe, and highly immunogenic vaccine platform. Recently, there are developmental vaccines targeting SARS-CoV-2, the causative agent of COVID-19. The COVID-19 pandemic affected humanity worldwide, bringing out incomputable human and financial losses. The race for better, more efficacious vaccines is happening almost simultaneously as the virus increasingly produces variants of concern (VOCs). The VOCs Alpha, Beta, Gamma, and Delta share common mutations mainly in the spike receptor-binding domain (RBD), demonstrating convergent evolution, associated with increased transmissibility and immune evasion. Thus, the identification and understanding of these mutations is crucial for the production of new, optimized vaccines. The use of a very flexible vaccine platform in COVID-19 vaccine development is an important feature that cannot be ignored. Incorporating the spike protein and its variations into VLP vaccines is a desirable strategy as the morphology and size of VLPs allows for better presentation of several different antigens. Furthermore, VLPs elicit robust humoral and cellular immune responses, which are safe, and have been studied not only against SARS-CoV-2 but against other coronaviruses as well. Here, we describe the recent advances and improvements in vaccine development using VLP technology.


Science ◽  
2020 ◽  
pp. eabb9983 ◽  
Author(s):  
Yasunori Watanabe ◽  
Joel D. Allen ◽  
Daniel Wrapp ◽  
Jason S. McLellan ◽  
Max Crispin

The emergence of the betacoronavirus, SARS-CoV-2, the causative agent of COVID-19, represents a significant threat to global human health. Vaccine development is focused on the principal target of the humoral immune response, the spike (S) glycoprotein, which mediates cell entry and membrane fusion. SARS-CoV-2 S gene encodes 22 N-linked glycan sequons per protomer, which likely play a role in protein folding and immune evasion. Here, using a site-specific mass spectrometric approach, we reveal the glycan structures on a recombinant SARS-CoV-2 S immunogen. This analysis enables mapping of the glycan-processing states across the trimeric viral spike. We show how SARS-CoV-2 S glycans differ from typical host glycan processing, which may have implications in viral pathobiology and vaccine design.


Parasitology ◽  
2014 ◽  
Vol 141 (5) ◽  
pp. 641-645 ◽  
Author(s):  
SURENDRA KUMAR PRAJAPATI ◽  
OM PRAKASH SINGH

SUMMARYThe immune evasion gene family of malaria parasites encodes variant surface proteins that are expressed at the surface of infected erythrocytes and help the parasite in evading the host immune response by means of antigenic variation. The identification ofPlasmodium vivax virorthologous immune evasion gene family from primate malaria parasites would provide new insight into the evolution of virulence and pathogenesis. Threevirsubfamilies viz.vir-B, vir-Dandvir-Gwere successfully PCR amplified from primate malaria parasites, cloned and sequenced. DNA sequence analysis confirmed orthologues ofvir-Dsubfamily inPlasmodium cynomolgi, Plasmodium simium, Plasmodium simiovaleandPlasmodium fieldi. The identifiedvir-Dorthologues are 1–9 distinct members of the immune evasion gene family which have 68–83% sequence identity withvir-Dand 71·2–98·5% sequence identity within the members identified from primate malaria parasites. The absence of othervirsubfamilies among primate malaria parasites reflects the limitations in the experimental approach. This study clearly identified the presence ofvir-Dlike sequences in four species ofPlasmodiuminfecting primates that would be useful in understanding the evolution of virulence in malaria parasites.


2004 ◽  
Vol 11 (6) ◽  
pp. 987-995 ◽  
Author(s):  
Marcelo U. Ferreira ◽  
Mônica da Silva Nunes ◽  
Gerhard Wunderlich

2008 ◽  
Vol 180 (4) ◽  
pp. 2496-2503 ◽  
Author(s):  
Hajime Hisaeda ◽  
Kohhei Tetsutani ◽  
Takashi Imai ◽  
Chikako Moriya ◽  
Liping Tu ◽  
...  

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