{"gene":"PF3D7_1107800","run_date":"2026-09-08T12:51:28","timeline":{"discoveries":[{"year":2023,"finding":"PfAP2-P (PF3D7_1107800) is an essential transcription factor in P. falciparum blood stages with two peaks of expression. Inducible knockout showed it is essential for trophozoite development, var gene regulation, merozoite development, and parasite egress. ChIP-seq at both expression peaks demonstrated PfAP2-P binding to promoters of genes controlling trophozoite development, host cell remodelling, antigenic variation, and pathogenicity. Single-cell RNA-seq and FACS revealed de-repression of most var genes in Δpfap2-p parasites, and Δpfap2-p parasites overexpress early gametocyte marker genes, indicating a regulatory role in sexual stage conversion.","method":"Inducible knockout (DiCre), ChIP-seq, single-cell RNA-seq, FACS","journal":"Nature microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible KO with defined cellular phenotypes, ChIP-seq for genome-wide binding, scRNA-seq, multiple orthogonal methods in a single study","pmids":["37884813"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"finding":"AP2-P (PF3D7_1107800) mediates long-range intra- and interchromosomal interactions among active, stage-specific genes in P. falciparum. Micro-C near-nucleosome resolution contact maps revealed that AP2-P, together with a putative MORC chromatin remodeler, organizes both heterochromatic subtelomeric fold structures (facilitating interactions among var genes) and euchromatic long-range interactions among co-activated stage-specific genes. Functional specificity is achieved via combinatorial binding with other sequence-specific DNA-binding factors.","method":"Micro-C (near-nucleosome resolution DNA-DNA contact mapping), ChIP-seq, combinatorial binding analysis","journal":"Nature microbiology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — Micro-C structural genomics plus ChIP-seq, multiple orthogonal methods, single lab but rigorous","pmids":["40588593"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PfAP2-P (PF3D7_1107800) is an essential P. falciparum ApiAP2 transcription factor that binds promoters of genes controlling trophozoite development, host cell remodelling, var gene-mediated antigenic variation, merozoite formation, and egress during two peaks of intraerythrocytic expression, and additionally organizes long-range chromosomal interactions at both heterochromatic (var gene) and euchromatic (stage-specific gene) loci through combinatorial action with a MORC chromatin remodeler."},"narrative":{"mechanistic_narrative":"PF3D7_1107800 (AP2-P) is an essential ApiAP2-family transcription factor that governs the intraerythrocytic developmental program of Plasmodium falciparum, expressed in two peaks and controlling trophozoite development, host cell remodelling, antigenic variation, merozoite formation, and egress [PMID:37884813]. Genome-wide occupancy places AP2-P at the promoters of genes driving these processes, and its inducible loss de-represses most var genes and causes overexpression of early gametocyte markers, implicating it in both antigenic variation and the restraint of sexual-stage conversion [PMID:37884813]. Beyond acting as a promoter-binding regulator, AP2-P also shapes nuclear architecture: together with a putative MORC chromatin remodeler it organizes long-range intra- and interchromosomal contacts, folding heterochromatic subtelomeric var loci and bridging co-activated euchromatic stage-specific genes, with target specificity set by combinatorial binding alongside other sequence-specific DNA-binding factors [PMID:40588593]. No further mechanistic detail — including direct DNA-binding motif, MORC interaction interface, or structural basis — has been characterized in the available corpus.","teleology":[{"year":2023,"claim":"Establishing whether PF3D7_1107800 is a functional regulator rather than a passive family member, this work defined AP2-P as an essential transcription factor whose loss disrupts trophozoite development, var regulation, merozoite formation, and egress, tying a single ApiAP2 factor to multiple stages of the blood cycle.","evidence":"DiCre inducible knockout with phenotyping, ChIP-seq at both expression peaks, single-cell RNA-seq and FACS in P. falciparum blood stages","pmids":["37884813"],"confidence":"High","gaps":["No defined consensus DNA-binding motif or direct demonstration of sequence-specific binding by the AP2 domain","Mechanism by which de-repression of var genes occurs (direct vs. indirect) not resolved","How AP2-P loss triggers early gametocyte marker overexpression mechanistically unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"claim":"Moving beyond promoter occupancy, this work showed AP2-P also organizes three-dimensional genome architecture, folding heterochromatic var loci and bridging co-activated euchromatic genes via combinatorial action with a putative MORC remodeler.","evidence":"Micro-C near-nucleosome-resolution contact mapping combined with ChIP-seq and combinatorial binding analysis in P. falciparum","pmids":["40588593"],"confidence":"High","gaps":["Direct physical interaction between AP2-P and the MORC remodeler not biochemically demonstrated","Identity of the other sequence-specific factors providing combinatorial specificity not defined","Causal separation of AP2-P's architectural role from its transcriptional role not established"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"The DNA-recognition specificity of the AP2 domain and the biochemical nature of the AP2-P/MORC partnership remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model or defined binding motif for PF3D7_1107800","No direct protein-protein interaction data for the proposed MORC cooperation","Roles in stages beyond the intraerythrocytic cycle uncharacterized"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":["PUTATIVE MORC CHROMATIN REMODELER (FUNCTIONAL COOPERATION) [#1]"],"other_free_text":["Two peaks of expression across the intraerythrocytic developmental cycle [#0]","Essential; inducible knockout blocks trophozoite development, merozoite formation, and egress [#0]","Loss de-represses most var genes (antigenic variation) and causes overexpression of early gametocyte markers, implicating it in sexual-stage conversion control [#0]","Organizes long-range intra- and interchromosomal contacts at both heterochromatic var loci and euchromatic co-activated genes, with specificity via combinatorial binding [#1]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"24572369","id":"PMC_24572369","title":"A transcriptional switch underlies commitment to sexual development in malaria parasites.","date":"2014","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/24572369","citation_count":397,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfAP2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"16040597","id":"PMC_16040597","title":"Discovery of the principal specific transcription factors of Apicomplexa and their implication for the evolution of the AP2-integrase DNA binding domains.","date":"2005","source":"Nucleic acids 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Inducible knockout showed it is essential for trophozoite development, var gene regulation, merozoite development, and parasite egress. ChIP-seq at both expression peaks demonstrated PfAP2-P binding to promoters of genes controlling trophozoite development, host cell remodelling, antigenic variation, and pathogenicity. Single-cell RNA-seq and FACS revealed de-repression of most var genes in Δpfap2-p parasites, and Δpfap2-p parasites overexpress early gametocyte marker genes, indicating a regulatory role in sexual stage conversion.\",\n      \"method\": \"Inducible knockout (DiCre), ChIP-seq, single-cell RNA-seq, FACS\",\n      \"journal\": \"Nature microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible KO with defined cellular phenotypes, ChIP-seq for genome-wide binding, scRNA-seq, multiple orthogonal methods in a single study\",\n      \"pmids\": [\"37884813\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"AP2-P (PF3D7_1107800) mediates long-range intra- and interchromosomal interactions among active, stage-specific genes in P. falciparum. Micro-C near-nucleosome resolution contact maps revealed that AP2-P, together with a putative MORC chromatin remodeler, organizes both heterochromatic subtelomeric fold structures (facilitating interactions among var genes) and euchromatic long-range interactions among co-activated stage-specific genes. Functional specificity is achieved via combinatorial binding with other sequence-specific DNA-binding factors.\",\n      \"method\": \"Micro-C (near-nucleosome resolution DNA-DNA contact mapping), ChIP-seq, combinatorial binding analysis\",\n      \"journal\": \"Nature microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — Micro-C structural genomics plus ChIP-seq, multiple orthogonal methods, single lab but rigorous\",\n      \"pmids\": [\"40588593\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    }\n  ],\n  \"current_model\": \"PfAP2-P (PF3D7_1107800) is an essential P. falciparum ApiAP2 transcription factor that binds promoters of genes controlling trophozoite development, host cell remodelling, var gene-mediated antigenic variation, merozoite formation, and egress during two peaks of intraerythrocytic expression, and additionally organizes long-range chromosomal interactions at both heterochromatic (var gene) and euchromatic (stage-specific gene) loci through combinatorial action with a MORC chromatin remodeler.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_1107800 (AP2-P) is an essential ApiAP2-family transcription factor that governs the intraerythrocytic developmental program of Plasmodium falciparum, expressed in two peaks and controlling trophozoite development, host cell remodelling, antigenic variation, merozoite formation, and egress [#0]. Genome-wide occupancy places AP2-P at the promoters of genes driving these processes, and its inducible loss de-represses most var genes and causes overexpression of early gametocyte markers, implicating it in both antigenic variation and the restraint of sexual-stage conversion [#0]. Beyond acting as a promoter-binding regulator, AP2-P also shapes nuclear architecture: together with a putative MORC chromatin remodeler it organizes long-range intra- and interchromosomal contacts, folding heterochromatic subtelomeric var loci and bridging co-activated euchromatic stage-specific genes, with target specificity set by combinatorial binding alongside other sequence-specific DNA-binding factors [#1]. No further mechanistic detail — including direct DNA-binding motif, MORC interaction interface, or structural basis — has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2023,\n      \"claim\": \"Establishing whether PF3D7_1107800 is a functional regulator rather than a passive family member, this work defined AP2-P as an essential transcription factor whose loss disrupts trophozoite development, var regulation, merozoite formation, and egress, tying a single ApiAP2 factor to multiple stages of the blood cycle.\",\n      \"evidence\": \"DiCre inducible knockout with phenotyping, ChIP-seq at both expression peaks, single-cell RNA-seq and FACS in P. falciparum blood stages\",\n      \"pmids\": [\"37884813\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No defined consensus DNA-binding motif or direct demonstration of sequence-specific binding by the AP2 domain\",\n        \"Mechanism by which de-repression of var genes occurs (direct vs. indirect) not resolved\",\n        \"How AP2-P loss triggers early gametocyte marker overexpression mechanistically unknown\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Moving beyond promoter occupancy, this work showed AP2-P also organizes three-dimensional genome architecture, folding heterochromatic var loci and bridging co-activated euchromatic genes via combinatorial action with a putative MORC remodeler.\",\n      \"evidence\": \"Micro-C near-nucleosome-resolution contact mapping combined with ChIP-seq and combinatorial binding analysis in P. falciparum\",\n      \"pmids\": [\"40588593\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct physical interaction between AP2-P and the MORC remodeler not biochemically demonstrated\",\n        \"Identity of the other sequence-specific factors providing combinatorial specificity not defined\",\n        \"Causal separation of AP2-P's architectural role from its transcriptional role not established\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The DNA-recognition specificity of the AP2 domain and the biochemical nature of the AP2-P/MORC partnership remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structural model or defined binding motif for PF3D7_1107800\",\n        \"No direct protein-protein interaction data for the proposed MORC cooperation\",\n        \"Roles in stages beyond the intraerythrocytic cycle uncharacterized\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0000981\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0043565\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0006355\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0006338\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0070828\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"putative MORC chromatin remodeler (functional cooperation) [#1]\"],\n    \"other_free_text\": [\n      \"Two peaks of expression across the intraerythrocytic developmental cycle [#0]\",\n      \"Essential; inducible knockout blocks trophozoite development, merozoite formation, and egress [#0]\",\n      \"Loss de-represses most var genes (antigenic variation) and causes overexpression of early gametocyte markers, implicating it in sexual-stage conversion control [#0]\",\n      \"Organizes long-range intra- and interchromosomal contacts at both heterochromatic var loci and euchromatic co-activated genes, with specificity via combinatorial binding [#1]\"\n    ]\n  }\n}","audit_flag":{"gene":"PF3D7_1107800","tier":"IDENTITY_CHECK","verdict":"identity unverified","subtype":"names_other_cards","uniprot_band":"","rules_fired":"R12","issue":"No cited paper names this card; 1 of 2 cited papers name other catalogue genes (PF3D7_1468100). The summary may describe one of those genes."},"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1107800","name":null,"product":"AP2 domain transcription factor AP2-P","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0939100","name":null,"product":"AP2 domain transcription factor, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0905400","name":null,"product":"AP2 domain transcription factor, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"ApiAP2","evaluation":null}