{"gene":"PF3D7_0215700","run_date":"2026-09-07T10:55:51","timeline":{"discoveries":[{"year":1989,"finding":"The RPB2 (largest subunit of RNA polymerase II) gene in P. falciparum encodes a protein of 2452 amino acids — the largest eukaryotic RPII largest subunit — with five conserved regions separated by enlarged variable regions, a short highly conserved heptapeptide repeat domain in the C-terminal domain bounded by a diverged heptapeptide repeat domain on its 5' side and a long carboxyl-terminal extension on its 3' side. The gene is present as a single copy on chromosome 3 and is expressed in asexual erythrocytic stages as a 9 kb mRNA.","method":"Gene isolation, sequencing, Southern blotting (single-copy), Northern blotting (expression stage), and comparative sequence analysis of conserved/variable domains","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct gene isolation with sequencing and blotting, single lab, multiple orthogonal methods (Southern, Northern, sequence comparison)","pmids":["2690004"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2005,"finding":"RNA polymerase II (which includes RPB2 as its second-largest subunit) synthesizes antisense RNA in the nucleus of P. falciparum at multiple genomic loci; this antisense RNA synthesis is sensitive to the RNA polymerase II inhibitor alpha-amanitin, and both antisense and sense transcription occur concurrently in nuclei isolated from synchronized parasites.","method":"Nuclear run-on transcription assay with single-stranded DNA probes; alpha-amanitin inhibition; synchronized parasite nuclear isolation","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct nuclear run-on with pharmacological inhibitor validation, single lab, two orthogonal approaches (probe hybridization + inhibitor sensitivity)","pmids":["15703443"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"RNA polymerase II (which includes RPB2) is engaged with promoter regions prior to the transcriptional burst at the trophozoite stage of the intraerythrocytic developmental cycle, suggesting that Pol II pausing plays a dominant role in gene regulation in P. falciparum.","method":"Genome-wide nascent RNA profiling (GRO-seq/nascent RNA sequencing) combined with analysis of Pol II occupancy at promoter regions","journal":"Nucleic acids research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — genome-wide sequencing approach with indirect inference of Pol II pausing; RPB2 itself not directly manipulated; single lab","pmids":["28531310"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_0215700 (RPB2) encodes the largest subunit of P. falciparum RNA polymerase II — an unusually large (2452 aa) protein with five conserved eukaryotic RPII domains separated by enlarged variable regions and a distinctive C-terminal heptapeptide repeat domain — expressed as a single-copy gene in asexual erythrocytic stages; the RNA polymerase II complex containing RPB2 catalyzes both sense and antisense nuclear transcription (sensitive to alpha-amanitin) and appears to engage promoters prior to a trophozoite-stage transcriptional burst, suggesting a Pol II pausing mechanism for stage-specific gene regulation."},"narrative":{"mechanistic_narrative":"PF3D7_0215700 (RPB2) encodes the largest subunit of P. falciparum RNA polymerase II, a 2452-amino-acid protein — the largest eukaryotic RPII largest subunit described — organized into five conserved regions separated by enlarged variable regions and terminating in a short conserved heptapeptide repeat domain flanked by a diverged heptapeptide repeat and a long carboxyl-terminal extension; it is single-copy on chromosome 3 and expressed as a 9 kb mRNA in asexual erythrocytic stages [PMID:2690004]. The RNA polymerase II complex that contains RPB2 catalyzes nuclear transcription of both sense and antisense RNA, activity that is inhibited by alpha-amanitin, with sense and antisense synthesis occurring concurrently in synchronized parasite nuclei [PMID:15703443]. Beyond its role as a subunit of the Pol II transcription machinery, no RPB2-specific mechanistic detail — subunit interactions, catalytic contributions, or regulatory partners — has been characterized in the available corpus, and the association of Pol II with promoters ahead of the trophozoite transcriptional burst is inferred at the complex level rather than through direct manipulation of RPB2 [PMID:28531310].","teleology":[{"year":1989,"claim":"Establishing that P. falciparum possesses an RPB2 gene defined the parasite's core transcriptional machinery and revealed an unusually large largest subunit with an expanded architecture, framing questions about how a divergent Pol II operates in this organism.","evidence":"Gene isolation, sequencing, Southern and Northern blotting, and comparative domain analysis in P. falciparum","pmids":["2690004"],"confidence":"Medium","gaps":["No functional demonstration that the encoded protein assembles into or catalyzes transcription within a Pol II complex","Functional significance of the enlarged variable regions and diverged heptapeptide repeat unresolved","No protein-level or subcellular localization data"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2005,"claim":"Demonstrating alpha-amanitin-sensitive nuclear synthesis of both sense and antisense RNA showed that the Pol II machinery containing RPB2 is responsible for bidirectional transcription in the parasite, expanding its role beyond conventional sense-strand output.","evidence":"Nuclear run-on transcription assay with single-stranded probes and alpha-amanitin inhibition in synchronized P. falciparum nuclei","pmids":["15703443"],"confidence":"Medium","gaps":["Assigns activity to the Pol II complex broadly, not to RPB2 specifically","Genomic loci and regulatory purpose of antisense transcription not defined","No direct RPB2 perturbation to confirm its requirement"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"Genome-wide nascent RNA profiling indicated that Pol II engages promoters before the trophozoite-stage transcriptional burst, introducing Pol II pausing as a candidate mechanism for stage-specific gene regulation in the intraerythrocytic cycle.","evidence":"Genome-wide nascent RNA sequencing with analysis of Pol II promoter occupancy in P. falciparum","pmids":["28531310"],"confidence":"Low","gaps":["Pausing is inferred from occupancy patterns; RPB2 itself was not manipulated","No mechanistic link between RPB2 and the pausing/release step","Pausing model not validated by independent methods"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"How RPB2 specifically contributes to Pol II assembly, catalysis, bidirectional transcription, and promoter-proximal pausing remains unresolved, as no study in the corpus directly perturbs or biochemically characterizes the RPB2 subunit itself.","evidence":"No direct RPB2 loss-of-function, structural, or interaction data in the timeline","pmids":[],"confidence":"Low","gaps":["No genetic knockout or knockdown of RPB2","No structural model or subunit-interaction map","No identified regulatory factors acting on RPB2"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["RNA polymerase II"],"partners":[],"other_free_text":["2452-aa largest subunit of P. falciparum RNA polymerase II; five conserved regions with enlarged variable regions, a conserved heptapeptide repeat domain flanked by a diverged repeat and a long C-terminal extension [#0]","Single-copy gene on chromosome 3, expressed as a 9 kb mRNA in asexual erythrocytic stages [#0]","Pol II activity is alpha-amanitin-sensitive and produces both sense and antisense nuclear RNA concurrently in synchronized parasites [#1]","Pol II engages promoters prior to the trophozoite-stage transcriptional burst, consistent with a pausing-based regulatory model (inferred at the complex level, not via direct RPB2 manipulation) [#2]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"10693754","id":"PMC_10693754","title":"A simple RNA analysis method shows var and rif multigene family expression patterns in Plasmodium falciparum.","date":"2000","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/10693754","citation_count":234,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RNA"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"2690004","id":"PMC_2690004","title":"An enlarged largest subunit of Plasmodium falciparum RNA polymerase II defines conserved and variable RNA polymerase domains.","date":"1989","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/2690004","citation_count":71,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RNA"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"4971014","id":"PMC_4971014","title":"DNA, RNA , and protein synthesis in erythrocytic forms of Plasmodium knowlesi.","date":"1968","source":"The American journal of tropical medicine and hygiene","url":"https://pubmed.ncbi.nlm.nih.gov/4971014","citation_count":56,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["DNA","RNA"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"15703443","id":"PMC_15703443","title":"RNA polymerase II synthesizes antisense RNA in Plasmodium falciparum.","date":"2005","source":"RNA (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/15703443","citation_count":53,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RNA"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"28531310","id":"PMC_28531310","title":"Nascent RNA sequencing reveals mechanisms of gene regulation in the human malaria parasite Plasmodium falciparum.","date":"2017","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/28531310","citation_count":52,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RNA"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"7976752","id":"PMC_7976752","title":"The ribosomal RNA genes of Plasmodium.","date":"1994","source":"Advances in parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/7976752","citation_count":46,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RNA"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"41721429","id":"PMC_41721429","title":"Integration of ATAC-seq and RNA-seq reveals temperature-responsive regulatory regions in Plasmodium falciparum asexual stages.","date":"2026","source":"Parasites & vectors","url":"https://pubmed.ncbi.nlm.nih.gov/41721429","citation_count":1,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RNA"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":4903,"output_tokens":1008,"usd":0.014915,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":5895,"output_tokens":2159,"usd":0.041725,"stage2_stop_reason":"end_turn"},"total_usd":0.05664,"stage1_batch_id":"msgbatch_01DbiymDmubkPpYvdbAu5a7V","stage2_batch_id":"msgbatch_012TbrWvMRH129T7PQ4SmvrJ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1989,\n      \"finding\": \"The RPB2 (largest subunit of RNA polymerase II) gene in P. falciparum encodes a protein of 2452 amino acids — the largest eukaryotic RPII largest subunit — with five conserved regions separated by enlarged variable regions, a short highly conserved heptapeptide repeat domain in the C-terminal domain bounded by a diverged heptapeptide repeat domain on its 5' side and a long carboxyl-terminal extension on its 3' side. The gene is present as a single copy on chromosome 3 and is expressed in asexual erythrocytic stages as a 9 kb mRNA.\",\n      \"method\": \"Gene isolation, sequencing, Southern blotting (single-copy), Northern blotting (expression stage), and comparative sequence analysis of conserved/variable domains\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct gene isolation with sequencing and blotting, single lab, multiple orthogonal methods (Southern, Northern, sequence comparison)\",\n      \"pmids\": [\"2690004\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"RNA polymerase II (which includes RPB2 as its second-largest subunit) synthesizes antisense RNA in the nucleus of P. falciparum at multiple genomic loci; this antisense RNA synthesis is sensitive to the RNA polymerase II inhibitor alpha-amanitin, and both antisense and sense transcription occur concurrently in nuclei isolated from synchronized parasites.\",\n      \"method\": \"Nuclear run-on transcription assay with single-stranded DNA probes; alpha-amanitin inhibition; synchronized parasite nuclear isolation\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct nuclear run-on with pharmacological inhibitor validation, single lab, two orthogonal approaches (probe hybridization + inhibitor sensitivity)\",\n      \"pmids\": [\"15703443\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RNA polymerase II (which includes RPB2) is engaged with promoter regions prior to the transcriptional burst at the trophozoite stage of the intraerythrocytic developmental cycle, suggesting that Pol II pausing plays a dominant role in gene regulation in P. falciparum.\",\n      \"method\": \"Genome-wide nascent RNA profiling (GRO-seq/nascent RNA sequencing) combined with analysis of Pol II occupancy at promoter regions\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — genome-wide sequencing approach with indirect inference of Pol II pausing; RPB2 itself not directly manipulated; single lab\",\n      \"pmids\": [\"28531310\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_0215700 (RPB2) encodes the largest subunit of P. falciparum RNA polymerase II — an unusually large (2452 aa) protein with five conserved eukaryotic RPII domains separated by enlarged variable regions and a distinctive C-terminal heptapeptide repeat domain — expressed as a single-copy gene in asexual erythrocytic stages; the RNA polymerase II complex containing RPB2 catalyzes both sense and antisense nuclear transcription (sensitive to alpha-amanitin) and appears to engage promoters prior to a trophozoite-stage transcriptional burst, suggesting a Pol II pausing mechanism for stage-specific gene regulation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_0215700 (RPB2) encodes the largest subunit of P. falciparum RNA polymerase II, a 2452-amino-acid protein — the largest eukaryotic RPII largest subunit described — organized into five conserved regions separated by enlarged variable regions and terminating in a short conserved heptapeptide repeat domain flanked by a diverged heptapeptide repeat and a long carboxyl-terminal extension; it is single-copy on chromosome 3 and expressed as a 9 kb mRNA in asexual erythrocytic stages [#0]. The RNA polymerase II complex that contains RPB2 catalyzes nuclear transcription of both sense and antisense RNA, activity that is inhibited by alpha-amanitin, with sense and antisense synthesis occurring concurrently in synchronized parasite nuclei [#1]. Beyond its role as a subunit of the Pol II transcription machinery, no RPB2-specific mechanistic detail — subunit interactions, catalytic contributions, or regulatory partners — has been characterized in the available corpus, and the association of Pol II with promoters ahead of the trophozoite transcriptional burst is inferred at the complex level rather than through direct manipulation of RPB2 [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 1989,\n      \"claim\": \"Establishing that P. falciparum possesses an RPB2 gene defined the parasite's core transcriptional machinery and revealed an unusually large largest subunit with an expanded architecture, framing questions about how a divergent Pol II operates in this organism.\",\n      \"evidence\": \"Gene isolation, sequencing, Southern and Northern blotting, and comparative domain analysis in P. falciparum\",\n      \"pmids\": [\"2690004\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No functional demonstration that the encoded protein assembles into or catalyzes transcription within a Pol II complex\",\n        \"Functional significance of the enlarged variable regions and diverged heptapeptide repeat unresolved\",\n        \"No protein-level or subcellular localization data\"\n      ],\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrating alpha-amanitin-sensitive nuclear synthesis of both sense and antisense RNA showed that the Pol II machinery containing RPB2 is responsible for bidirectional transcription in the parasite, expanding its role beyond conventional sense-strand output.\",\n      \"evidence\": \"Nuclear run-on transcription assay with single-stranded probes and alpha-amanitin inhibition in synchronized P. falciparum nuclei\",\n      \"pmids\": [\"15703443\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Assigns activity to the Pol II complex broadly, not to RPB2 specifically\",\n        \"Genomic loci and regulatory purpose of antisense transcription not defined\",\n        \"No direct RPB2 perturbation to confirm its requirement\"\n      ],\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Genome-wide nascent RNA profiling indicated that Pol II engages promoters before the trophozoite-stage transcriptional burst, introducing Pol II pausing as a candidate mechanism for stage-specific gene regulation in the intraerythrocytic cycle.\",\n      \"evidence\": \"Genome-wide nascent RNA sequencing with analysis of Pol II promoter occupancy in P. falciparum\",\n      \"pmids\": [\"28531310\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Pausing is inferred from occupancy patterns; RPB2 itself was not manipulated\",\n        \"No mechanistic link between RPB2 and the pausing/release step\",\n        \"Pausing model not validated by independent methods\"\n      ],\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RPB2 specifically contributes to Pol II assembly, catalysis, bidirectional transcription, and promoter-proximal pausing remains unresolved, as no study in the corpus directly perturbs or biochemically characterizes the RPB2 subunit itself.\",\n      \"evidence\": \"No direct RPB2 loss-of-function, structural, or interaction data in the timeline\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No genetic knockout or knockdown of RPB2\",\n        \"No structural model or subunit-interaction map\",\n        \"No identified regulatory factors acting on RPB2\"\n      ],\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003899\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0006366\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"complexes\": [\n      \"RNA polymerase II\"\n    ],\n    \"partners\": [],\n    \"other_free_text\": [\n      \"2452-aa largest subunit of P. falciparum RNA polymerase II; five conserved regions with enlarged variable regions, a conserved heptapeptide repeat domain flanked by a diverged repeat and a long C-terminal extension [#0]\",\n      \"Single-copy gene on chromosome 3, expressed as a 9 kb mRNA in asexual erythrocytic stages [#0]\",\n      \"Pol II activity is alpha-amanitin-sensitive and produces both sense and antisense nuclear RNA concurrently in synchronized parasites [#1]\",\n      \"Pol II engages promoters prior to the trophozoite-stage transcriptional burst, consistent with a pausing-based regulatory model (inferred at the complex level, not via direct RPB2 manipulation) [#2]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0215700","name":null,"product":"DNA-directed RNA polymerase II subunit RPB2, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0312400","name":null,"product":"DNA-directed RNA polymerase II subunit RPB2, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0405200","name":null,"product":"DNA-directed RNA polymerase II subunit RPB2, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"RPB2","evaluation":null}