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  • 1
    Publication Date: 2013-12-20
    Description: Plasmodium falciparum resistance to artemisinin derivatives in southeast Asia threatens malaria control and elimination activities worldwide. To monitor the spread of artemisinin resistance, a molecular marker is urgently needed. Here, using whole-genome sequencing of an artemisinin-resistant parasite line from Africa and clinical parasite isolates from Cambodia, we associate mutations in the PF3D7_1343700 kelch propeller domain ('K13-propeller') with artemisinin resistance in vitro and in vivo. Mutant K13-propeller alleles cluster in Cambodian provinces where resistance is prevalent, and the increasing frequency of a dominant mutant K13-propeller allele correlates with the recent spread of resistance in western Cambodia. Strong correlations between the presence of a mutant allele, in vitro parasite survival rates and in vivo parasite clearance rates indicate that K13-propeller mutations are important determinants of artemisinin resistance. K13-propeller polymorphism constitutes a useful molecular marker for large-scale surveillance efforts to contain artemisinin resistance in the Greater Mekong Subregion and prevent its global spread.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ariey, Frederic -- Witkowski, Benoit -- Amaratunga, Chanaki -- Beghain, Johann -- Langlois, Anne-Claire -- Khim, Nimol -- Kim, Saorin -- Duru, Valentine -- Bouchier, Christiane -- Ma, Laurence -- Lim, Pharath -- Leang, Rithea -- Duong, Socheat -- Sreng, Sokunthea -- Suon, Seila -- Chuor, Char Meng -- Bout, Denis Mey -- Menard, Sandie -- Rogers, William O -- Genton, Blaise -- Fandeur, Thierry -- Miotto, Olivo -- Ringwald, Pascal -- Le Bras, Jacques -- Berry, Antoine -- Barale, Jean-Christophe -- Fairhurst, Rick M -- Benoit-Vical, Francoise -- Mercereau-Puijalon, Odile -- Menard, Didier -- 090770/Z/09/Z/Wellcome Trust/United Kingdom -- 098051/Wellcome Trust/United Kingdom -- G0600718/Medical Research Council/United Kingdom -- Intramural NIH HHS/ -- England -- Nature. 2014 Jan 2;505(7481):50-5. doi: 10.1038/nature12876. Epub 2013 Dec 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Institut Pasteur, Parasite Molecular Immunology Unit, 75724 Paris Cedex 15, France [2] Centre National de la Recherche Scientifique, Unite de Recherche Associee 2581, 75724 Paris Cedex 15, France [3] Institut Pasteur, Genetics and Genomics of Insect Vectors Unit, 75724 Paris Cedex 15, France (F.A.); Institut Pasteur, Functional Genetics of Infectious Diseases Unit, 75724 Paris Cedex 15, France (J.B.); Centre de Physiopathologie de Toulouse-Purpan, Institut National de la Sante et de la Recherche Medicale UMR1043, Centre National de la Recherche Scientifique UMR5282, Universite Toulouse III, 31024 Toulouse Cedex 3, France Institut Pasteur, Unite de Biologie et Genetique du Paludisme, Team Malaria Targets and Drug Development, 75724 Paris Cedex 15, France (J.-C.B.). ; Institut Pasteur du Cambodge, Malaria Molecular Epidemiology Unit, Phnom Penh, Cambodia. ; Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA. ; 1] Institut Pasteur, Parasite Molecular Immunology Unit, 75724 Paris Cedex 15, France [2] Centre National de la Recherche Scientifique, Unite de Recherche Associee 2581, 75724 Paris Cedex 15, France. ; Institut Pasteur, Plate-forme Genomique, Departement Genomes et Genetique, 75724 Paris Cedex 15, France. ; 1] Institut Pasteur du Cambodge, Malaria Molecular Epidemiology Unit, Phnom Penh, Cambodia [2] Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA [3] National Center for Parasitology, Entomology and Malaria Control, Phnom Penh, Cambodia. ; National Center for Parasitology, Entomology and Malaria Control, Phnom Penh, Cambodia. ; SSA WHO, Drug Monitoring in Cambodia, National Center for Parasitology, Entomology and Malaria Control, Phnom Penh, Cambodia. ; 1] Service de Parasitologie et Mycologie, Centre Hospitalier Universitaire de Toulouse, 31059 Toulouse Cedex 9, France [2] Institut Pasteur, Genetics and Genomics of Insect Vectors Unit, 75724 Paris Cedex 15, France (F.A.); Institut Pasteur, Functional Genetics of Infectious Diseases Unit, 75724 Paris Cedex 15, France (J.B.); Centre de Physiopathologie de Toulouse-Purpan, Institut National de la Sante et de la Recherche Medicale UMR1043, Centre National de la Recherche Scientifique UMR5282, Universite Toulouse III, 31024 Toulouse Cedex 3, France Institut Pasteur, Unite de Biologie et Genetique du Paludisme, Team Malaria Targets and Drug Development, 75724 Paris Cedex 15, France (J.-C.B.). ; Naval Medical Research Unit #2 Detachment, Phnom Penh, Cambodia. ; Swiss Tropical and Public Health Institute, 4051 Basel, Switzerland. ; 1] Institut Pasteur, Parasite Molecular Immunology Unit, 75724 Paris Cedex 15, France [2] Institut Pasteur du Cambodge, Malaria Molecular Epidemiology Unit, Phnom Penh, Cambodia. ; 1] MRC Centre for Genomics and Global Health, University of Oxford, Oxford OX3 7BN, UK [2] Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok 10400, Thailand [3] Wellcome Trust Sanger Institute, Hinxton, Cambridge CB10 1SA, UK. ; Global Malaria Program, World Health Organization, 1211 Geneva, Switzerland. ; Centre National de Reference du Paludisme, CHU Bichat-Claude Bernard, APHP, PRES Sorbonne Paris Cite, 75018 Paris, France. ; 1] Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA [2]. ; 1] Centre National de la Recherche Scientifique, Laboratoire de Chimie de Coordination UPR8241, 31077 Toulouse Cedex 4, France [2] Universite de Toulouse, UPS, Institut National Polytechnique de Toulouse, 31077 Toulouse Cedex 4, France [3]. ; 1] Institut Pasteur, Parasite Molecular Immunology Unit, 75724 Paris Cedex 15, France [2] Centre National de la Recherche Scientifique, Unite de Recherche Associee 2581, 75724 Paris Cedex 15, France [3]. ; 1] Institut Pasteur du Cambodge, Malaria Molecular Epidemiology Unit, Phnom Penh, Cambodia [2].〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24352242" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Antimalarials/*pharmacology ; Artemisinins/*pharmacology ; Blood Cells/parasitology ; Cambodia ; Drug Resistance/drug effects/*genetics ; Genetic Markers/genetics ; Half-Life ; Humans ; Malaria, Falciparum/drug therapy/*parasitology ; Mutation/genetics ; Parasitic Sensitivity Tests ; Plasmodium falciparum/*drug effects/*genetics/growth & development/isolation & ; purification ; Polymorphism, Single Nucleotide/genetics ; Protein Structure, Tertiary/genetics ; Protozoan Proteins/chemistry/*genetics ; Time Factors
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2014-12-17
    Description: The emergence of artemisinin resistance in Southeast Asia imperils efforts to reduce the global malaria burden. We genetically modified the Plasmodium falciparum K13 locus using zinc-finger nucleases and measured ring-stage survival rates after drug exposure in vitro; these rates correlate with parasite clearance half-lives in artemisinin-treated patients. With isolates from Cambodia, where resistance first emerged, survival rates decreased from 13 to 49% to 0.3 to 2.4% after the removal of K13 mutations. Conversely, survival rates in wild-type parasites increased from 〈/=0.6% to 2 to 29% after the insertion of K13 mutations. These mutations conferred elevated resistance to recent Cambodian isolates compared with that of reference lines, suggesting a contemporary contribution of additional genetic factors. Our data provide a conclusive rationale for worldwide K13-propeller sequencing to identify and eliminate artemisinin-resistant parasites.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4349400/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4349400/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Straimer, Judith -- Gnadig, Nina F -- Witkowski, Benoit -- Amaratunga, Chanaki -- Duru, Valentine -- Ramadani, Arba Pramundita -- Dacheux, Melanie -- Khim, Nimol -- Zhang, Lei -- Lam, Stephen -- Gregory, Philip D -- Urnov, Fyodor D -- Mercereau-Puijalon, Odile -- Benoit-Vical, Francoise -- Fairhurst, Rick M -- Menard, Didier -- Fidock, David A -- R01 AI109023/AI/NIAID NIH HHS/ -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2015 Jan 23;347(6220):428-31. doi: 10.1126/science.1260867. Epub 2014 Dec 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, Columbia University College of Physicians and Surgeons, New York, NY, USA. ; Malaria Molecular Epidemiology Unit, Institut Pasteur du Cambodge, Phnom Penh, Cambodia. ; Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA. ; Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie de Coordination UPR8241, Toulouse, France. Universite de Toulouse, UPS, Institut National Polytechnique de Toulouse, Toulouse, France. ; Sangamo BioSciences, Richmond, CA, USA. ; Institut Pasteur, Parasite Molecular Immunology Unit, Paris, France. ; Department of Microbiology and Immunology, Columbia University College of Physicians and Surgeons, New York, NY, USA. Division of Infectious Diseases, Department of Medicine, Columbia University College of Physicians and Surgeons, New York, NY, USA. df2260@columbia.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25502314" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Antimalarials/*pharmacology ; Artemisinins/*pharmacology ; Cambodia ; Drug Resistance/*genetics ; Genetic Loci ; Humans ; Malaria, Falciparum/drug therapy/parasitology ; Molecular Sequence Data ; Mutation ; Plasmodium falciparum/*drug effects/*genetics ; Protein Structure, Tertiary ; Protozoan Proteins/chemistry/*genetics
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Gene 11 (1980), S. 163-167 
    ISSN: 0378-1119
    Keywords: E. coli ; Recombinant DNA ; introns ; lac promoter ; plasmid vectors
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0378-1119
    Keywords: Recombinant DNA ; cell-free translation ; membrane-bound polysemes ; plasmid vector ; signal sequence
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Four large multigene families have been described in Plasmodium falciparum malaria parasites (var, rif, stevor and Pf60). var and rif genes code for erythrocyte surface proteins and undergo clonal antigenic variation. We report here the characterization of the first Pf60 gene. The 6.1 gene is constitutively expressed by all mature blood stages and codes for a protein located within the nucleus. It has a single copy, 7-exon, 5′ domain, separated by an internal stop codon from a 3′ domain that presents a high homology with var exon II. Double-site immunoassay and P. falciparum transient transfection using the reporter luciferase gene demonstrated translation through the internal ochre codon. The 6.1 N-terminal domain has no homology with any protein described to date. Sequence analysis identified a leucine zipper and a putative nuclear localization signal and showed a high probability for coiled coils. Evidence for N-terminal coiled coil-mediated protein interactions was obtained. This identifies the 6.1 protein as a novel nuclear protein. These data show that the Pf60 and var genes form a superfamily with a common 3′ domain, possibly involved in regulating homo- or heteromeric interactions.
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  • 6
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Under iron-starvation, the highly pathogenic Yersinia synthesize several iron-regulated proteins including two high-molecular-weight polypeptides (HMWP1 and HMWP2). From the chromosome of Yersinia enterocolitica serovar O:8 (strain Ye 8081), the genes coding for the HMWP2 (irp2) and its promoter were cloned into plasmid pUC18 (plR2) and used as a probe. We show here that the irp2 gene is present only in the highly pathogenic strains and that its promoter is iron-regulated in Escherichia coli. After introduction of the plR2 plasmid into a fur mutant of E. coli, both the iron-starved and the iron-replete bacteria expressed the HMWP2. Repressibility of irp2 by iron was restored by introduction of a plasmid carrying the fur gene. These results demonstrate that the irp2 promoter is controlled by the Fur repressor in E. coli. Mutagenesis of the chromosomal irp2 gene of Yersinia pseudotuberculosis was obtained by homologous recombination with a 1 kb fragment of this gene cloned on the suicide plasmid pJM703.1. Inactivation of irp2 resulted in the non-expression of both HMWPs, while introduction of plasmid plR2 into the mutant strain led to the synthesis of the HMWP2 only. Therefore, It is probable that the genes coding for the HMWPs constitute an operon where irp2 is upstream of irp1. When comparing the virulence of the wild-type strain and of its irp2 mutant derivative, we found that the 50% lethality (LD50) for mice of the mutant strain was increased, whatever the route of infection, but more markedly when injected parenterally. Accordingly, these data demonstrate that a mutation in the irp2 gene alters the pathogenicity of Y. pseudotuberculosis. Since the introduction of the irp2 gene into the mutant strain did not restore its virulence, it is likely that both HMWPs are required for the expression of the high-pathogenicity phenotype.
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Inc
    The @journal of eukaryotic microbiology 52 (2005), S. 0 
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In the past few years, genetic manipulation of Plasmodium falciparum has allowed functional studies of many parasite proteins. However, a careful interpretation of gene manipulation results is required, as chromosomal events may occur in vitro independently of the experimental modifications (gene invalidation, overexpression …), and because of the intrinsic mutagenic potential of genetic manipulation, or pleiotropic consequences related to the insertion of exogenous sequences. To ensure that mutant phenotypes arise from the planned mutations, it is necessary to obtain revertants re-expressing the wild-type gene. On this line, we have developed a positive/negative selection strategy allowing in a first step, gene targeting, then excision of the resistance marker. We converted the Toxoplasma gondii DHFR/TS into a tri-functional enzyme following fusion with the Herpes virus type I thymidine kinase (HSV-TK1). Positive selection corresponds to pyrimethamine resistant development, while negative selection acts in presence of the pro-drogue ganciclovir. We used this tool to study RESA, a dense granule protein that associates with spectrin following invasion. Resa gene invalidation was obtained using a targeting plasmid allowing expression of the fusion DHFR/TS/HSV-TK1, and molecular and phenotypic analyses of mutant parasites were performed. Next, wild-type resa gene expression was restored after excision of all the exogenous sequences following phosphorylation of ganciclovir by the HSV thymidine kinase into a toxic metabolite. Phenotypic studies of revertants confirm some functions attributed to RESA protein, and validate the positive/negative strategy in this reverse genetic approach, a useful tool for development of “hit and run” mutagenesis in P. falciparum.
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimie 72 (1990), S. 201 
    ISSN: 0300-9084
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Molecular & Biochemical Parasitology 60 (1993), S. 241-248 
    ISSN: 0166-6851
    Keywords: Palo Alto strain ; Plasmodium falciparum ; Ring-infected erythrocyte surface antigen ; Saimiri monkey ; [abr] FUP/SP or CP; Uganda Palo Alto strain of Plasmodium falciparum ; [abr] PCR; polymerase chain reaction ; [abr] RESA2; ring-infected erythrocyte surface antigen-2 ; [abr] RESA; ring-infected erythrocyte surface antigen ; [abr] SSC; standard saline citrate
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
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  • 10
    ISSN: 0166-6851
    Keywords: Babesia ; Invasion ; Malaria ; Merozoite ; Multigene family ; Polymorphism
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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