Plasmodium falciparum
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ABSTRACT:
PROVIDER: PRJNA294409 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:DNA damage regulation and its role in drug-related phenotypes in the malaria parasites. [RNA]
| PRJNA294410 | ENA
Project description:DNA damage regulation and its role in drug-related phenotypes in the malaria parasites.
| PRJNA294407 | ENA
Project description:To help malaria parasites survive unpredictable host immune responses, it is known that genes for surface proteins express stochastically in Plasmodium falciparum. Here, we demonstrate that gene expression for intracellular metabolic functions may be preordained and insensitive to specific metabolic perturbations. In a tightly-controlled, large microarray study involving over 100 hybridizations to isogenic drug-sensitive and drug-resistant parasites, the lethal antifolate WR99210 failed to over-produce RNA for the biochemically and genetically proven target dihydrofolate reductase-thymidylate synthase (DHFR-TS). Beyond the target, this transcriptional obstinacy carried over to the rest of the parasite genome, including genes for target pathways of folate and pyrimidine metabolism. Even 12 hours after commitment to death, the transcriptome remained faithful to evolutionarily entrained paths. A system-wide transcriptional disregard for metabolic perturbations in malaria parasites may contribute to selective vulnerabilities of the parasite to lethal antimetabolites. While large protective metabolic responses were not detected, DNA microarrays helped capture small, but reproducible drug-dependent perturbations within hours of drug exposure. In addition, in Plasmodium cells that had adapted to long-term drug exposure, DNA microarrays revealed new, large genome-wide transcriptional adjustments in the hard-wired transcriptional program itself. Keywords: Plasmodium falciparum treated with WR99210
2008-11-15 | GSE9724 | GEO
Project description:To help malaria parasites survive unpredictable host immune responses, it is known that genes for surface proteins express stochastically in Plasmodium falciparum. Here, we demonstrate that gene expression for intracellular metabolic functions may be preordained and insensitive to specific metabolic perturbations. In a tightly-controlled, large microarray study involving over 100 hybridizations to isogenic drug-sensitive and drug-resistant parasites, the lethal antifolate WR99210 failed to over-produce RNA for the biochemically and genetically proven target dihydrofolate reductase-thymidylate synthase (DHFR-TS). Beyond the target, this transcriptional obstinacy carried over to the rest of the parasite genome, including genes for target pathways of folate and pyrimidine metabolism. Even 12 hours after commitment to death, the transcriptome remained faithful to evolutionarily entrained paths. A system-wide transcriptional disregard for metabolic perturbations in malaria parasites may contribute to selective vulnerabilities of the parasite to lethal antimetabolites. While large protective metabolic responses were not detected, DNA microarrays helped capture small, but reproducible drug-dependent perturbations within hours of drug exposure. In addition, in Plasmodium cells that had adapted to long-term drug exposure, DNA microarrays revealed new, large genome-wide transcriptional adjustments in the hard-wired transcriptional program itself. Keywords: Plasmodium falciparum treated with pyrimethamine
2008-11-15 | GSE9868 | GEO
Project description:To help malaria parasites survive unpredictable host immune responses, it is known that genes for surface proteins express stochastically in Plasmodium falciparum. Here, we demonstrate that gene expression for intracellular metabolic functions may be preordained and insensitive to specific metabolic perturbations. In a tightly-controlled, large microarray study involving over 100 hybridizations to isogenic drug-sensitive and drug-resistant parasites, the lethal antifolate WR99210 failed to over-produce RNA for the biochemically and genetically proven target dihydrofolate reductase-thymidylate synthase (DHFR-TS). Beyond the target, this transcriptional obstinacy carried over to the rest of the parasite genome, including genes for target pathways of folate and pyrimidine metabolism. Even 12 hours after commitment to death, the transcriptome remained faithful to evolutionarily entrained paths. A system-wide transcriptional disregard for metabolic perturbations in malaria parasites may contribute to selective vulnerabilities of the parasite to lethal antimetabolites. While large protective metabolic responses were not detected, DNA microarrays helped capture small, but reproducible drug-dependent perturbations within hours of drug exposure. In addition, in Plasmodium cells that had adapted to long-term drug exposure, DNA microarrays revealed new, large genome-wide transcriptional adjustments in the hard-wired transcriptional program itself. Keywords: Plasmodium falciparum treated with pyrimethamine
2008-11-15 | GSE9853 | GEO
Project description:To help malaria parasites survive unpredictable host immune responses, it is known that genes for surface proteins express stochastically in Plasmodium falciparum. Here, we demonstrate that gene expression for intracellular metabolic functions may be preordained and insensitive to specific metabolic perturbations. In a tightly-controlled, large microarray study involving over 100 hybridizations to isogenic drug-sensitive and drug-resistant parasites, the lethal antifolate WR99210 failed to over-produce RNA for the biochemically and genetically proven target dihydrofolate reductase-thymidylate synthase (DHFR-TS). Beyond the target, this transcriptional obstinacy carried over to the rest of the parasite genome, including genes for target pathways of folate and pyrimidine metabolism. Even 12 hours after commitment to death, the transcriptome remained faithful to evolutionarily entrained paths. A system-wide transcriptional disregard for metabolic perturbations in malaria parasites may contribute to selective vulnerabilities of the parasite to lethal antimetabolites. While large protective metabolic responses were not detected, DNA microarrays helped capture small, but reproducible drug-dependent perturbations within hours of drug exposure. In addition, in Plasmodium cells that had adapted to long-term drug exposure, DNA microarrays revealed new, large genome-wide transcriptional adjustments in the hard-wired transcriptional program itself. Keywords: Plasmodium falciparum treated with pyrimethamine RNA from pyrimethamine-treated parasite vs RNA from untreated control, Pyr-sensitive TM4/8.2 strain, pyrimethamine concentration at IC50 and treated for 0 h and 24 h, microarray data were obtained from at least four hybridizations using RNA from at lease two independent parasite cultures
2010-05-16 | E-GEOD-9853 | biostudies-arrayexpress
Project description:To help malaria parasites survive unpredictable host immune responses, it is known that genes for surface proteins express stochastically in Plasmodium falciparum. Here, we demonstrate that gene expression for intracellular metabolic functions may be preordained and insensitive to specific metabolic perturbations. In a tightly-controlled, large microarray study involving over 100 hybridizations to isogenic drug-sensitive and drug-resistant parasites, the lethal antifolate WR99210 failed to over-produce RNA for the biochemically and genetically proven target dihydrofolate reductase-thymidylate synthase (DHFR-TS). Beyond the target, this transcriptional obstinacy carried over to the rest of the parasite genome, including genes for target pathways of folate and pyrimidine metabolism. Even 12 hours after commitment to death, the transcriptome remained faithful to evolutionarily entrained paths. A system-wide transcriptional disregard for metabolic perturbations in malaria parasites may contribute to selective vulnerabilities of the parasite to lethal antimetabolites. While large protective metabolic responses were not detected, DNA microarrays helped capture small, but reproducible drug-dependent perturbations within hours of drug exposure. In addition, in Plasmodium cells that had adapted to long-term drug exposure, DNA microarrays revealed new, large genome-wide transcriptional adjustments in the hard-wired transcriptional program itself. Keywords: Plasmodium falciparum treated with pyrimethamine RNA from pyrimethamine-treated parasite vs RNA from untreated control, Pyr-sensitive TM4/8.2 parasite strain, pyrimethamine concentration at IC50 and treated for 2 h, 4 h, and 8 h, microarray data were obtained from at least four hybridizations using RNA from at least two independent parasite cultures
2010-05-16 | E-GEOD-9868 | biostudies-arrayexpress
Project description:To help malaria parasites survive unpredictable host immune responses, it is known that genes for surface proteins express stochastically in Plasmodium falciparum. Here, we demonstrate that gene expression for intracellular metabolic functions may be preordained and insensitive to specific metabolic perturbations. In a tightly-controlled, large microarray study involving over 100 hybridizations to isogenic drug-sensitive and drug-resistant parasites, the lethal antifolate WR99210 failed to over-produce RNA for the biochemically and genetically proven target dihydrofolate reductase-thymidylate synthase (DHFR-TS). Beyond the target, this transcriptional obstinacy carried over to the rest of the parasite genome, including genes for target pathways of folate and pyrimidine metabolism. Even 12 hours after commitment to death, the transcriptome remained faithful to evolutionarily entrained paths. A system-wide transcriptional disregard for metabolic perturbations in malaria parasites may contribute to selective vulnerabilities of the parasite to lethal antimetabolites. While large protective metabolic responses were not detected, DNA microarrays helped capture small, but reproducible drug-dependent perturbations within hours of drug exposure. In addition, in Plasmodium cells that had adapted to long-term drug exposure, DNA microarrays revealed new, large genome-wide transcriptional adjustments in the hard-wired transcriptional program itself. Keywords: Plasmodium falciparum treated with WR99210 RNA from P. falciparum Dd2 and B1G9 (WR99210 resistant cell-line) trophozoites that had been treated with 10 nM WR99210 for varying durations (3, 6, 9, 15, 18, 21 and 24h) was hybridized against a common pool of trophozoite RNA from a cognate clone, a culture containing 0.1% (v/v) DMSO lacking drug was used as untreated control, microarray data were obtained from at least four hybridizations using RNA from two independent parasite cultures
2008-11-14 | E-GEOD-9724 | biostudies-arrayexpress
Project description:Nanopore sequencing of drug-resistance-associated genes in malaria parasites, Plasmodium falciparum
| PRJDB5281 | ENA
Project description:P. falciparum is the deadliest causative agent of human malaria. This parasite has historically developed resistance to many drugs, including the current frontline treatments, so new therapeutic targets are needed Our previous work on guanine quadruplexes (G4s) in the parasite’s DNA and RNA has highlighted their influence on parasite biology, and also revealed G4 stabilising compounds as promising candidates for drug repositioning. In particular, quarfloxin, a former anticancer agent, kills blood-stage parasites at all developmental stages, with fast rates of kill and nanomolar potency. Here we explored the molecular mechanism of quarfloxin and its related derivative CX-5461. In vitro, both compounds bound to P. falciparum-encoded G4 sequences. In cellulo, quarfloxin was more potent than CX-5461, and could prevent establishment of blood-stage malaria in vivo in a murine model. CX-5461 showed clear DNA damaging activity, as reported in human cells, while quarfloxin caused weaker signatures of DNA damage. Both compounds caused transcriptional dysregulation in the parasite, but the affected genes were largely different, again suggesting different modes of action. Therefore, CX-5461 may act primarily as a DNA damaging agent in both Plasmodium parasites and mammalian cells, whereas the complete anti-malarial mode of action of quarfloxin may be parasite-specific, and remains elusive.
2024-01-02 | GSE235142 | GEO