| 2014 |
AP2-G (PF3D7_1222600) is a DNA-binding transcription factor that functions as a master regulator of sexual-stage development. Forward and reverse genetics demonstrated that PF3D7_1222600 function is essential for P. falciparum sexual differentiation; genome-wide PF3D7_1222600 cognate motif occurrence combined with global transcriptional changes from PF3D7_1222600 ablation identified early gametocyte genes as direct targets whose wild-type expression depends on PF3D7_1222600. |
Forward genetics (loss-of-function mutants), reverse genetics (conditional ablation), genome-wide motif mapping, transcriptional profiling |
Nature |
High |
24572369
|
| 2014 |
PbAP2-G (ortholog of PF3D7_1222600) in P. berghei is essential for commitment of asexually replicating forms to sexual development. Loss-of-function mutations in the gene encoding PbAP2-G (PBANKA_143750) were identified from parasites that had lost the ability to produce sexual stages after blood passage, and systematic gene deletion confirmed its essential role in gametocytogenesis. Data are consistent with a positive feedback loop involving PbAP2-G. |
Forward genetics (mutation identification from blood-passaged parasites), systematic gene deletion, transcriptional analysis |
Nature |
High |
24572359
|
| 2014 |
PfHP1 (heterochromatin protein 1) controls expression of PF3D7_1222600 (pfap2-g): conditional depletion of PfHP1 causes derepression of PF3D7_1222600, leading to increased gametocyte conversion, establishing PfHP1-dependent heterochromatin as a silencer of the ap2-g locus. |
Conditional protein depletion (PfHP1 knockdown), transcriptional profiling, gametocytogenesis assay |
Cell host & microbe |
High |
25121746
|
| 2014 |
PfHda2 (P. falciparum histone deacetylase 2) globally silences virulence genes and controls the frequency of PF3D7_1222600 (PfAP2-g) expression; depletion of PfHda2 leads to dysregulated PF3D7_1222600 expression and increased gametocytogenesis, identifying PfHda2 as an upstream epigenetic regulator of AP2-G. |
Conditional gene depletion (PfHda2 knockdown), transcriptional profiling, gametocytogenesis assay |
Cell host & microbe |
Medium |
25121747
|
| 2018 |
GDV1 (gametocyte development 1 protein) acts as an upstream activator of PF3D7_1222600 (ap2-g) by targeting heterochromatin and triggering HP1 eviction, thereby derepressing the ap2-g locus. GDV1 expression was itself responsive to environmental triggers of sexual conversion and controlled via a gdv1 antisense RNA. |
Conditional overexpression of GDV1, chromatin immunoprecipitation (HP1 occupancy assay), transcriptional profiling, genetic manipulation |
Science (New York, N.Y.) |
High |
29590075
|
| 2008 |
The AP2 domain of PF3D7_1222600 (PfAP2-G) binds specific DNA sequences; the DNA-binding specificity of ApiAP2 domains (including the one in PF3D7_1222600) was characterized using protein-binding microarrays, identifying cognate motifs and coupling these trans factors to cis-regulatory motifs in Plasmodium. Protein-DNA sequence specificity is conserved in orthologous proteins between phylogenetically distant Apicomplexan species. |
Protein-binding microarrays (PBM), computational prediction, comparative genomics |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
18541913
|
| 2020 |
PF3D7_1222600 (PfAP2-G) is a transcriptional activator that dynamically binds hundreds of sites across the genome; ChIP-seq identified direct targets including early gametocyte genes and genes important for red blood cell invasion. PF3D7_1222600 occupancy differs between gametocytes derived via next-cycle versus same-cycle conversion. Regulation by PF3D7_1222600 requires physical interaction with PfAP2-I (a second transcription factor). |
ChIP-seq (genome-wide occupancy), conditional knockdown, transcriptional profiling, co-immunoprecipitation |
Nature communications |
High |
32198457
|
| 2017 |
Single-cell RNA sequencing of malaria cultures during sexual commitment showed that AP2-G (PF3D7_1222600) expression during the commitment cycle drives transcriptional changes in nascent merozoites; AP2-G+ mature schizonts specifically upregulate additional regulators of gene expression (other AP2 transcription factors, histone-modifying enzymes, and regulators of nucleosome positioning), suggesting AP2-G activates a downstream epigenetic cascade. A conditional AP2-G knockdown line was used to attribute these changes to PF3D7_1222600. |
Single-cell RNA sequencing, conditional AP2-G knockdown, comparative transcriptomics |
Nature |
High |
29094698
|
| 2018 |
PF3D7_1222600 (PfAP2-G)-positive sexually committed parasite stages exist prior to the previously known committed schizont stage. Two distinct routes to sexual conversion were demonstrated: (1) PF3D7_1222600-expressing parasites completing a replicative cycle before converting, and (2) a direct route with conversion within the same cycle as initial PF3D7_1222600 expression, linked to early ring-stage expression. This was demonstrated using PF3D7_1222600 as a molecular marker of commitment. |
Conditional expression system tracking PF3D7_1222600, plaque assays, reanalysis of single-cell RNA-seq data |
Nature microbiology |
Medium |
30478286
|
| 2018 |
In P. berghei, conditional overexpression of AP2-G (ortholog of PF3D7_1222600) synchronously converts the great majority (>90%) of parasites into fertile gametocytes, demonstrating that AP2-G is sufficient to trigger gametocytogenesis and that gender-specific transcription occurs within 6 hours of induction. |
Conditional overexpression (inducible AP2-G system), flow cytometry, transcriptomics |
Nature microbiology |
High |
30177743
|
| 2020 |
PF3D7_1222600 (PfAP2-G) expression in P. berghei begins at ~12 h post-invasion, peaks at ~18 h when sexual features first appear, and decreases as sex-specific features manifest. ChIP-seq at peak expression identified >1,000 genomic binding sites with the main motif GTACNY. Targets include genes related to protein biogenesis and upstream gametocyte-specific transcription factors (AP2-G2, AP2-FG, and AP2-G itself), indicating AP2-G autoregulates and activates a transcriptional cascade for early gametocyte differentiation. |
Fluorescence microscopy (expression timing), ChIP-seq (genome-wide binding), gene disruption assays |
Parasitology international |
Medium |
34119684
|
| 2020 |
A conditional PF3D7_1222600 (PfAP2-G) expression system in P. falciparum achieves ~90% sexual conversion upon induction. Transcriptomic and phenotypic characterization of sexually committed schizonts and sexual rings revealed downregulation of genes involved in solute transport upon sexual commitment, among other transcriptional changes attributable to PF3D7_1222600 induction. |
Conditional expression system (inducible PfAP2-G), RNA-seq, flow cytometry, phenotypic characterization |
Science advances |
High |
32577509
|
| 2017 |
In P. berghei, the ap2-g gene (ortholog of PF3D7_1222600) was found to have non-essential functions in blood stages, and AP2-G2 was identified as a repressor active in both asexual and sexual stages. Comparative transcriptomics across ApiAP2 mutants and developmental stages established that AP2-G is part of a network of stage-specific interacting ApiAP2 proteins controlling co-regulated gene clusters with shared cis promoter elements. |
Systematic knockout screen, comparative transcriptomics, cis-element analysis |
Cell host & microbe |
Medium |
28081440
|
| 2015 |
Transcriptional biosynthetic labeling experiments in F12 parasites (which lack functional PF3D7_1222600/PfAP2-G) showed that the transcriptional program required for sexual commitment and maturation is initiated but aborted in the absence of PF3D7_1222600, and gametocyte-specific mRNA stabilization fails. This establishes that PF3D7_1222600 is required both for transcriptional reprogramming and for stabilization of gametocyte-specific transcripts. |
Biosynthetic mRNA labeling (thiol-modified pyrimidine incorporation via FCU expression), comparative transcriptomics between wild-type and F12 (PfAP2-G-deficient) parasites |
Genome research |
Medium |
28416533
|
| 2021 |
PfAP2-G5 (PF3D7_1139300) suppresses transcriptional activity of PF3D7_1222600 (pfap2-g) by binding to its upstream region and gene body, the latter linked to maintenance of local heterochromatin, thereby preventing sexual commitment. Knockout of pfap2-g5 upregulates PF3D7_1222600 expression and promotes sexual commitment, establishing PfAP2-G5 as a direct transcriptional repressor of PF3D7_1222600. |
Systematic ApiAP2 functional screening, gene knockout, ChIP-seq, RNA-seq |
Nucleic acids research |
Medium |
34365503
|
| 2023 |
The frequency of PF3D7_1222600 (ap2-g) derepression is regulated by metabolic competition for S-adenosylmethionine (SAM) between histone methyltransferases and phosphoethanolamine methyltransferase. When phosphatidylcholine precursors (LysoPC, choline) are scarce, increased SAM consumption for de novo phosphatidylcholine synthesis impairs histone methylation (H3K9me3) responsible for silencing the ap2-g locus, increasing derepression frequency and sexual differentiation. |
Molecular genetics, metabolomics, chromatin profiling (H3K9me3 ChIP), conditional manipulation of phospholipid pathway |
Nature microbiology |
High |
37277533
|
| 2021 |
H3K36me2 and H3K36me3 at the PF3D7_1222600 (ap2-g) locus in stage II gametocytes actively repress the gene post-commitment, providing the first evidence of ap2-g repression in post-commitment gametocytes. This H3K36 methylation-mediated repression is a stage-specific mechanism that operates after the gene's initial activation. |
Chromatin immunoprecipitation followed by sequencing (ChIP-seq), Jumonji inhibitor treatment (JIB-04), transcriptional profiling |
Epigenetics & chromatin |
Medium |
33794978
|
| 2026 |
A single valine-to-leucine substitution at position 2163 (V2163L) within the AP2 DNA-binding domain of PF3D7_1222600 (AP2-G) abolishes DNA binding to the consensus motif GnGTAC, eliminates transcriptional activation of target genes, and abrogates autoregulation of the ap2-g locus. Using AP2-G.L2163 parasite lines, GDV1 was shown to be essential for the initial activation of the silent ap2-g locus during the trophozoite-to-schizont transition in the absence of functional AP2-G. AP2-G.V2163 (wild-type) was required for MSRP1 expression, distinguishing early from late sexually committed schizonts. |
Forward and reverse mutation editing (CRISPR), DNA-binding assays, transcriptional reporter assays, transgenic parasite lines |
Nature communications |
High |
41547993
|
| 2025 |
A single valine-to-leucine substitution (V2163L) in the AP2 domain of PF3D7_1222600 abrogates DNA binding to the GnGTAC motif and eliminates AP2-G-dependent transcription including autoregulation (preprint version of the published study above). GDV1 was shown to drive initial activation of the silent ap2-g locus in the absence of functional AP2-G, demonstrating GDV1's critical role in the initial trophozoite-to-schizont activation step. |
Forward and reverse mutation editing, DNA-binding assays, transcriptional reporter assays |
bioRxiv : the preprint server for biologypreprint |
Medium |
40568120
|
| 2026 |
A cis-regulatory element (URE-G) within the pfap2-g (PF3D7_1222600) locus is required for high levels of H3K9 methylation at the ap2-g locus. Deletion of URE-G decreases H3K9me3 at this locus, resulting in PF3D7_1222600 activation and increased gametocyte formation without altering global heterochromatin structure, establishing a sequence-dependent mechanism for heterochromatin maintenance specifically at the ap2-g locus. |
Cis-regulatory element deletion (genetic manipulation), H3K9me3 ChIP analysis, gametocyte formation assay |
Scientific reports |
Medium |
42443261
|
| 2025 |
Fragments from the beginning of the coding sequence of PF3D7_1222600 (pfap2-g) nucleate H3K9me3-marked heterochromatin with low efficiency (requiring long ~2 kb fragments and occurring in only a fraction of parasites), whereas fragments from the pfap2-g upstream region do not nucleate heterochromatin but are required for its maintenance, demonstrating that the primary DNA sequence at different parts of the ap2-g locus plays distinct roles in HC nucleation versus maintenance. |
Integration of regulatory fragments into euchromatic loci, H3K9me3 ChIP analysis |
PLoS pathogens |
Medium |
40455742
|
| 2016 |
Genomic sequencing of gametocyte non-producing 3D7-derived lines F12 and A4 confirmed that the PF3D7_1222600 locus (encoding PfAP2-G) harbors mutations responsible for the loss of gametocyte production, validating PF3D7_1222600 as the genetic switch for gametocyte development in these lines. |
Whole genome sequencing of gametocyte non-producing lines |
Malaria journal |
Medium |
27098483
|
| 2022 |
A CRISPRa system targeting PF3D7_1222600 (PfAP2-G) achieved >10-fold increase of PfAP2-G transcripts, resulting in >4-fold higher gametocytemia in induced P. falciparum parasites, demonstrating that transcriptional upregulation of PF3D7_1222600 is sufficient to drive increased sexual commitment. |
Inducible CRISPRi/a (dCas9-GCN5 activation), RT-qPCR, gametocytemia assay |
Microbiology spectrum |
Medium |
35510853
|
| 2016 |
PF3D7_1222600 (ap2-g) is epigenetically silenced in asexual parasites and is among a set of loci prone to spontaneous stochastic activation; this stochastic activation mechanism provides the baseline rate of gametocyte production observed in culture and infections. |
Epigenetic analysis, transcriptional profiling of asexual parasites, genetic ablation experiments |
Nature |
Medium |
24572369
|
| 2021 |
PfAP2-G2 knockout in P. falciparum leads to downregulation of PF3D7_1222600 (PfAP2-G) specifically at the schizont stage (but not ring stage), and ChIP-qPCR showed PfAP2-G2 is enriched at the transcriptional start site of PfMDV-1 in ring and schizont stages, implicating PfAP2-G2 as an indirect upstream regulator of PF3D7_1222600 expression during schizogony. |
Gene knockout, RT-qPCR, RNA-seq, ChIP-qPCR |
Frontiers in microbiology |
Low |
33537025
|