Plasmodium falciparum
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA310415 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR3176590_1.fastq.gz | Fastqsanger.gz | |||
| SRR3176590_2.fastq.gz | Fastqsanger.gz | |||
| SRR3176591_1.fastq.gz | Fastqsanger.gz | |||
| SRR3176591_2.fastq.gz | Fastqsanger.gz | |||
| SRR3176592_1.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 5 of 22 |
Similar Datasets
Project description:Here we fully characterize the genomes of 14 Plasmodium falciparum patient isolates taken recently from the Iquitos regions using genome-scanning, a microarray-based technique which delineates the majority of single-base changes, indels and copy number variants distinguishing the coding regions of two clones. We show that the parasite population in the Peruvian Amazon is highly structured with a limited number of genotypes and low recombination frequencies. Despite the essentially clonal nature of some isolates, we see high frequencies of mutations in subtelomeric highly variable genes and internal var genes indicating mutations arising during self-mating or mitotic replication. The data also reveal that 1 or 2 meioses separate different isolates showing that P. falciparum clones isolated from different individuals in defined geographical regions could be useful in linkage analyses or quantitative trait locus studies. Through pair-wise comparisons of different isolates we discovered point mutations in the apicoplast genome that are close to known mutations that confer clindamycin resistance in other species but which were hitherto unknown in malaria parasites. Subsequent drug sensitivity testing revealed over 100-fold increase clindamycin EC50 in strains harboring one of these mutations. This evidence of clindamycin resistant parasites in the Amazon suggests a shift should be made in health policy away from quinine+clindamycin therapy for malaria in pregnant women and infants and that the development of new lincosamide antibiotics for malaria should be reconsidered. Genome DNA from Peruvian Isolates vs. Reference 3D7
2010-08-04 | E-GEOD-22861 | biostudies-arrayexpress
Project description:Here we fully characterize the genomes of 14 Plasmodium falciparum patient isolates taken recently from the Iquitos regions using genome-scanning, a microarray-based technique which delineates the majority of single-base changes, indels and copy number variants distinguishing the coding regions of two clones. We show that the parasite population in the Peruvian Amazon is highly structured with a limited number of genotypes and low recombination frequencies. Despite the essentially clonal nature of some isolates, we see high frequencies of mutations in subtelomeric highly variable genes and internal var genes indicating mutations arising during self-mating or mitotic replication. The data also reveal that 1 or 2 meioses separate different isolates showing that P. falciparum clones isolated from different individuals in defined geographical regions could be useful in linkage analyses or quantitative trait locus studies. Through pair-wise comparisons of different isolates we discovered point mutations in the apicoplast genome that are close to known mutations that confer clindamycin resistance in other species but which were hitherto unknown in malaria parasites. Subsequent drug sensitivity testing revealed over 100-fold increase clindamycin EC50 in strains harboring one of these mutations. This evidence of clindamycin resistant parasites in the Amazon suggests a shift should be made in health policy away from quinine+clindamycin therapy for malaria in pregnant women and infants and that the development of new lincosamide antibiotics for malaria should be reconsidered.
2010-08-05 | GSE22861 | GEO
Project description:The variant antigen, Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1), expressed on the surface of P. falciparum infected Red Blood Cells (iRBCs) is a critical virulence factor for malaria. Each parasite encodes 60 antigenically distinct var genes encoding PfEMP1s, but during infection the clonal parasite population expresses only one gene at a time before switching to the expression of a new variant antigen as an immune evasion mechanism to avoid the hostM-bM-^@M-^Ys antibody responses. The mechanism by which 59 of the 60 var genes are silenced remains largely unknown. We used microarrays to detail the global programme changes of gene expression caused by each gene knockout with a particular view towards which gene knockout results in transcriptional upregulation of the entire var gene family. Plasmodium falciparum clones, in each of which one of different histone lysine methylation modification enzyme genes was knocked out, were synchronized in the asexual stage and collected at indicated time points post invasion of erythrocytes for RNA extraction and hybridization on Affymetrix microarrays. We sought to identify the key epigenetic enzyme that controls silencing of the whole var gene family.
2013-05-25 | E-GEOD-47349 | biostudies-arrayexpress
Project description:The variant antigen, Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1), expressed on the surface of P. falciparum infected Red Blood Cells (iRBCs) is a critical virulence factor for malaria. Each parasite encodes 60 antigenically distinct var genes encoding PfEMP1s, but during infection the clonal parasite population expresses only one gene at a time before switching to the expression of a new variant antigen as an immune evasion mechanism to avoid the host’s antibody responses. The mechanism by which 59 of the 60 var genes are silenced remains largely unknown. We used microarrays to detail the global programme changes of gene expression caused by each gene knockout with a particular view towards which gene knockout results in transcriptional upregulation of the entire var gene family.
2013-05-25 | GSE47349 | GEO
Project description:Plasmodium falciparum var DBLa tag sequencing
| PRJNA386049 | ENA
Project description:Plasmodium falciparum clinical isolates Genome sequencing
| PRJNA251419 | ENA
Project description:ChIP-seq experiments were performed for the putative telomere repeat-binding factor (PfTRF) in the malaria parasite Plasmodium falciparum strain 3D7. The gene encoding this factor (PF3D7_1209300) was endogenously tagged with either a GFP- or a 3xHA-tag and these transgenic parasite lines were used in ChIP-sequencing experiments. Sequencing of the ChIP and input libraries showed enrichment of PfTRF at all telomere-repeat containing chromosome ends (reference genome Plasmodium falciparum 3D7 from PlasmoDB version 6.1) as well as in all upsB var promoters.In addition,PfTRF was enriched at seven additional, intra-chromosomal sites and called in the PfTRF-HA ChIP-seq only. Plasmodium falciparum 3D7 parasites were generated with -GFP or -3xHA C-terminal tagged TRF (PF3D7_1209300). Nuclei were isolated from formaldehyde cross-linked schizont-stage transgenic parasites and used to prepare chromatin. Chromatin immunoprecipitations were performed using mouse anti-GFP (Roche Diagnostics, #11814460001) or rat anti-HA 3F10 (Roche Diagnostics, #12158167001). Sequencing libraries were prepared according to a Plasmodium-optimized library preparation procedure including KAPA polymerase-mediated PCR amplification.
2016-07-15 | E-GEOD-76537 | biostudies-arrayexpress
Project description:The completion of the Plasmodium falciparum clone 3D7 genome provides a basis on which to conduct comparative proteomics studies of this human pathogen. Here, we applied a high-throughput proteomics approach to identify new potential drug and vaccine targets and to better understand the biology of this complex protozoan parasite. We characterized four stages of the parasite life cycle (sporozoites, merozoites, trophozoites and gametocytes) by multidimensional protein identification technology. Functional profiling of over 2,400 proteins agreed with the physiology of each stage. Unexpectedly, the antigenically variant proteins of var and rif genes, defined as molecules on the surface of infected erythrocytes, were also largely expressed in sporozoites. The detection of chromosomal clusters encoding co-expressed proteins suggested a potential mechanism for controlling gene expression. Keywords: ordered
2002-12-22 | E-GEOD-92 | biostudies-arrayexpress
Project description:Plasmodium falciparum isolate:Plasmodium falciparum Togo clinical isolates Raw sequence reads
| PRJNA559044 | ENA
Project description:ChIP-seq experiments were performed for the putative Telomere Repeat-binding Zinc finger protein (PfTRZ) in the malaria parasite Plasmodium falciparum strain 3D7. The gene encoding this factor (PF3D7_1209300) was endogenously tagged with either a GFP- or a 3xHA-tag and these transgenic parasite lines were used in ChIP-sequencing experiments. Sequencing of the ChIP and input libraries showed enrichment of PfTRZ at all telomere-repeat containing chromosome ends (reference genome Plasmodium falciparum 3D7 from PlasmoDB version 6.1) as well as in all upsB var promoters.In addition,PfTRZ was enriched at seven additional, intra-chromosomal sites and called in the PfTRZ-HA ChIP-seq only.
2016-07-15 | GSE76537 | GEO