PfAP2-I-GFP-msp5MUT vs PfAP2-I-GFP 3D7 [timecourse 1]
Ontology highlight
ABSTRACT:
ORGANISM(S): Plasmodium falciparum
PROVIDER: GSE77807 | GEO | 2016/12/31
SECONDARY ACCESSION(S): PRJNA311602
REPOSITORIES: GEO
Similar Datasets
Project description:Obligate intracellular parasites must efficiently invade host cells in order to mature and be transmitted. For the malaria parasite Plasmodium falciparum, invasion of host red blood cells (RBCs) is essential. Here we describe a parasite-specific transcription factor belonging to the Apicomplexan Apetala 2 (ApiAP2) family that is responsible for regulating the expression of a subset of merozoite genes involved in RBC invasion (PfAP2-I). Our genome-wide analysis by ChIP-seq shows that PfAP2-I interacts with a specific DNA motif in the promoters of these genes. msp5 transcription levels decrease when the PfAP2-I DNA-binding motif is mutated in PfAP2-I-GFP parasites, showing that PfAP2-I must bind the DNA motif in order for msp5 to be transcribed.
2016-12-31 | GSE77809 | GEO
Project description:Transcriptional profiling of transgenic P. falciparum asexual blood stage parasites of the transgenic strain 3D7/DDGFP-PfAP2-HC at five time points during intra-erythrocytic parasite development. The DD (FKBP destabilisation domain) allows for the conditional expression of fusion proteins: DD fusion proteins are rapidly degraded or stably expressed in absence or presence of the stabilising ligand Shield-1, respectively (Banaszynski LA, Chen LC, Maynard-Smith LA, Ooi AG, Wandless TJ. A rapid, reversible, and tunable method to regulate protein function in living cells using synthetic small molecules.Cell. 2006 Sep 8;126(5):995-1004). The goal of this experiment was to identify genes differentially expressed in DDGFP-PfAP2-HC-expressing compared to DDGFP-PfAP2-HC-depleted parasites during the intra-erythtrocytic cell cycle.
2020-10-06 | GSE159061 | GEO
Project description:PfAP2-I-GFP-msp5MUT vs PfAP2-I-GFP 3D7
| PRJNA311596 | ENA
Project description:Differentiation from asexual blood stages to sexual gametocytes is required for transmission of malaria parasites from the human host to mosquitos, where sexual fertilization occurs to complete the lifecycle. Although preventing gametocyte development would block parasite transmission, the molecular mechanisms underlying sexual commitment and gametocyte maturation are still relatively unknown. Previous studies identified an ApiAP2 protein, AP2-G2, which plays a critical role in gametocyte maturation in rodent malaria parasite Plasmodium berghei by acting as the repressor of asexual stage genes in gametocytes. In this work we characterize the P. falciparum orthologue (PF3D7_1408200) of PbAP2-G2 and report that it plays a critical role in maturation of gametocytes. Disruption of pfap2-g2 did not obstruct commitment to sexual development but the majority of parasites were unable to develop normally beyond stage III gametocytes. In asexual stages PfAP2-G2 binds to the promoters of wide variety of genes expressed in diverse range of parasite’s life cycle stages including gametocytes, mosquito lifecycle stages early ring stage genes and genes encoding for proteins involved in egress and invasion. Surprisingly, we also identify binding of PfAP2-G2 in the gene body of almost 3000 genes. We could also show that PfAP2-G2 interacts with chromatin remodeling proteins and another ApiAP2 protein (PF3D7_1139300) whose motif is also overrepresented in the ChIP-seq data. Overall this work suggests that PfAP2-G2 is a transcriptional regulator that regulates genes possibly by recruiting additional transcription factors and chromatin remodeling machinery and plays a critical role in the development of malaria parasites as they transition from the asexual stage to gametocytes.
2021-02-16 | GSE157753 | GEO
Project description:To determine the genome-wide occupancy of the Plasmodium falciparum transcriptional regulator of invasion PfAP2-I (PfDd2_100013100/PF3D7_1007700), we used chromatin immunoprecipitation coupled with next-generation sequencing (ChIP-seq). Synchronized, schizont stage, 40 hours post-invasion, cultures of parasites expressing the AP2-I-GFP fusion protein were treated with formaldehyde to crosslink proteins to DNA and harvested. After shearing the DNA, the chromatin was incubated with anti-GFP antibody or IgG (as control) for immunoprecipitation. This material was used to generate Illumina sequencing libraries. The final libraries were multiplexed with fourteen barcoded samples per lane on an Illumina HiSeq 2500 system to generate 150 base pair single-end reads.
2017-06-01 | GSE80293 | GEO
Project description:Differentiation from asexual blood stages to sexual gametocytes is required for transmission of malaria parasites from the human to the mosquito host. Preventing gametocyte commitment and development would block parasite transmission, but the underlying molecular mechanisms behind these processes remain poorly understood. Here, we report that the ApiAP2 transcription factor, PfAP2-G2 (PF3D7_1408200) plays a critical role in the maturation of Plasmodium falciparum gametocytes. PfAP2-G2 binds to the promoters of a wide array of genes that are expressed at many stages of the parasite life cycle. Interestingly, we also find binding of PfAP2-G2 within the gene body of almost 3000 genes, which strongly correlates with the location of H3K36me3 and several other histone modifications as well as Heterochromatin Protein 1 (HP1), suggesting that occupancy of PfAP2-G2 in gene bodies may serve as an alternative regulatory mechanism. Disruption of pfap2-g2 does not impact asexual development, parasite multiplication rate, or commitment to sexual development but the majority of sexual parasites are unable to mature beyond stage III gametocytes. The absence of pfap2-g2 leads to overexpression of 28% of the genes bound by PfAP2-G2 and none of the PfAP2-g2 bound are downregulated, suggesting that it is a repressor. We also find that PfAP2-G2 interacts with chromatin remodeling proteins, a microrchidia (MORC) protein, and another ApiAP2 protein (PF3D7_1139300). Overall our data demonstrate that PfAP2-G2 is an important transcription factor that establishes an essential gametocyte maturation program in association with other chromatin-related proteins.
2021-02-01 | GSE160924 | GEO
Project description:Differentiation from asexual blood stages to sexual gametocytes is required for transmission of malaria parasites from the human to the mosquito host. Preventing gametocyte commitment and development would block parasite transmission, but the underlying molecular mechanisms behind these processes remain poorly understood. Here, we report that the ApiAP2 transcription factor, PfAP2-G2 (PF3D7_1408200) plays a critical role in the maturation of Plasmodium falciparum gametocytes. PfAP2-G2 binds to the promoters of a wide array of genes that are expressed at many stages of the parasite life cycle. Interestingly, we also find binding of PfAP2-G2 within the gene body of almost 3000 genes, which strongly correlates with the location of H3K36me3 and several other histone modifications as well as Heterochromatin Protein 1 (HP1), suggesting that occupancy of PfAP2-G2 in gene bodies may serve as an alternative regulatory mechanism. Disruption of pfap2-g2 does not impact asexual development, parasite multiplication rate, or commitment to sexual development but the majority of sexual parasites are unable to mature beyond stage III gametocytes. The absence of pfap2-g2 leads to overexpression of 28% of the genes bound by PfAP2-G2 and none of the PfAP2-g2 bound are downregulated, suggesting that it is a repressor. We also find that PfAP2-G2 interacts with chromatin remodeling proteins, a microrchidia (MORC) protein, and another ApiAP2 protein (PF3D7_1139300). Overall our data demonstrate that PfAP2-G2 is an important transcription factor that establishes an essential gametocyte maturation program in association with other chromatin-related proteins.
2021-02-01 | GSE160923 | GEO
Project description:In the malaria parasite Plasmodium falciparum, the switch from asexual multiplication to sexual differentiation into gametocytes is essential for transmission to mosquitos. One of the key determinants of sexual commitment is the transcription factor PfAP2-G, which has been proposed to orchestrate this crucial cell fate decision by driving expression of gametocyte genes. We show conclusively that PfAP2-G is a transcriptional activator of gametocyte genes and identify the earliest known markers expressed during commitment. Remarkably, we also find that in sexually committed cells, PfAP2-G is associated with the promoters of genes important for red blood cell invasion and activates them through its interactions with a second transcription factor. We thus demonstrate an intriguing transcriptional link between the apparently opposing processes of red blood cell invasion and gametocytogenesis that is coordinated by the master regulator PfAP2-G. This finding has important implications for the development of new anti-malarial drugs that block the invasion of red blood cells by sexually committed cells, thereby preventing parasite transmission.
2019-02-08 | GSE121312 | GEO
Project description:In the malaria parasite Plasmodium falciparum, the switch from asexual multiplication to sexual differentiation into gametocytes is essential for transmission to mosquitos. One of the key determinants of sexual commitment is the transcription factor PfAP2-G, which has been proposed to orchestrate this crucial cell fate decision by driving expression of gametocyte genes. We show conclusively that PfAP2-G is a transcriptional activator of gametocyte genes and identify the earliest known markers expressed during commitment. Remarkably, we also find that in sexually committed cells, PfAP2-G is associated with the promoters of genes important for red blood cell invasion and activates them through its interactions with a second transcription factor. We thus demonstrate an intriguing transcriptional link between the apparently opposing processes of red blood cell invasion and gametocytogenesis that is coordinated by the master regulator PfAP2-G. This finding has important implications for the development of new anti-malarial drugs that block the invasion of red blood cells by sexually committed cells, thereby preventing parasite transmission.
2019-02-08 | GSE120990 | GEO
Project description:Malarial parasite pathogenicity results from its ability to invade and remodel red blood cells (RBCs), expressing antigenic variant proteins for immune evasion and survival, and then to egress from the host cell. These sequential processes require concerted actions of a large number of proteins during the intraerythrocytic developmental cycle (IDC), but the molecular basis of the required regulation is only partially understood. Here, we have characterized an essential Apicomplexan AP2 (ApiAP2) transcription factor (we refer to it as PfAP2-P; Pathogenesis) that shows two peaks of expression during the IDC at 16- and 40-hour post invasion (h.p.i.). When expression of PfAP2-P at 40 h.p.i. was disrupted using an inducible gene knockout approach, ∆PfAP2-P parasites unable to form mature merozoites and egress from the host RBCs owing to strong down-regulation of several known egress- and invasion-associated genes, in addition to several novel hypothetical genes of thought to be involved in these key life cycle processes during the IDC. Disruption of PfAP2-P expression at 16 h.p.i. results in transcriptional activation of virtually majority of silenced var genes observed at both bulk and single cell level. This is also reflected by significantly higher level of recognition of the exported proteins on the ∆PfAP2-P parasite-infected RBCs by pooled sera from malaria-exposed individuals from endemic region. In addition, over-expression of many early gametocyte marker genes was also observed in ∆PfAP2-P parasites at both 40 h.p.i., and at 16 h.p.i. PfAP2-P directly regulates these genes by binding to their promoter region or indirectly through 14 other down-stream AP2 transcription factors. Taken together, we conclude that PfAP2-P is an upstream transcriptional regulator that participates in mutually exclusive expression pattern shown by the var family of genes and a critical determinant of parasite’s growth during the IDC.
2023-08-07 | GSE191025 | GEO