{"gene":"PF3D7_1221000","run_date":"2026-09-08T14:19:06","timeline":{"discoveries":[{"year":2009,"finding":"SET10 (PF3D7_1221000) localizes to distinct perinuclear sub-compartments in the P. falciparum nucleus, as determined by GFP/HA tagging and localization analysis, suggesting a role in virulence gene regulation at the nuclear periphery.","method":"GFP/HA epitope tagging and fluorescence microscopy localization","journal":"International journal for parasitology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization experiment with functional inference, single lab, no functional rescue or epistasis","pmids":["19765590"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"finding":"SET10 (PF3D7_1221000) was identified as an H3K4 methyltransferase that localizes exclusively to the perinuclear active var gene expression site and was reported to be required to maintain the active var gene in a poised state during parasite division, thereby supporting antigenic variation.","method":"Protein localization (fluorescence microscopy), histone methyltransferase activity assay, genetic disruption with var gene expression analysis","journal":"Cell host & microbe","confidence":"Low","confidence_rationale":"Tier 2 / Weak — findings from a single lab subsequently contradicted by multiple independent studies using more rigorous conditional KO approaches; confidence downgraded accordingly","pmids":["22264509"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"finding":"Genetic disruption of SET10 (PF3D7_1221000) is not lethal to P. falciparum and has no detectable effect on var gene expression, directly contradicting earlier reports that SET10 is essential for parasite viability and antigenic variation.","method":"Gene disruption (knockout) with var gene expression analysis by RT-PCR/RNA-seq","journal":"mSphere","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined gene expression phenotype (negative result), replicated independently by two other groups in 2024","pmids":["33536326"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"finding":"SET10 (PF3D7_1221000) deficiency in P. falciparum abolishes H3K18 monomethylation (H3K18me1) but does not reduce H3K4 methylation, indicating its primary catalytic activity in vivo is methylation of H3 at lysine 18, not lysine 4.","method":"Knockout/knockdown parasite lines with histone methylation profiling (antibody-based detection of specific marks)","journal":"mSphere","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with specific histone mark readout, single lab, not yet independently replicated","pmids":["39445823"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"finding":"SET10 (PF3D7_1221000) deficiency reduces intraerythrocytic growth but does not affect gametocyte commitment or maturation; SET10 shows nuclear localization with peak protein levels in schizonts.","method":"Tagged KO and KD parasite lines with growth assays, gametocyte commitment assays, and localization by fluorescence microscopy","journal":"mSphere","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO/KD with multiple phenotypic readouts, single lab","pmids":["39445823"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"finding":"SET10 (PF3D7_1221000) participates in an extensive nuclear interaction network identified by TurboID proximity labeling coupled with mass spectrometry; key interactors include ApiAP2 transcription factors, PfHDAC1, chromatin modulators PfMORC and PfISWI, mediators of RNA polymerase II, and DNA replication licensing factors.","method":"TurboID proximity labeling coupled with mass spectrometry","journal":"mSphere","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity labeling MS identifies interaction network, single lab, no reciprocal Co-IP validation described in abstract","pmids":["39445823"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"finding":"SET10 (PF3D7_1221000) KO upregulates transcripts encoding proteins linked to red blood cell remodeling and antigenic variation in schizonts, suggesting a repressive function of the H3K18me1 mark it deposits.","method":"Comparative transcriptomic profiling (RNA-seq) of PfSET10-KO schizonts","journal":"mSphere","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide RNA-seq with KO, single lab; transcriptional repression inferred but not directly linked to H3K18me1 occupancy at affected loci in the abstract","pmids":["39445823"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"finding":"SET10 (PF3D7_1221000) is dispensable for mutually exclusive var gene expression, var gene switching, asexual parasite proliferation, sexual conversion, and gametocyte differentiation; conditional KO showed no effect on global gene expression during asexual development or gametocytogenesis. SET10 shows different subnuclear localization patterns in asexual versus sexual stage parasites and is expressed specifically in female gametocytes.","method":"Iterative genome editing to generate conditional KO; RNA-seq; var gene switching assays; gametocyte differentiation assays; subnuclear localization by fluorescence microscopy","journal":"mSphere","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous conditional KO with multiple orthogonal phenotypic readouts (growth, switching, RNA-seq, gametocytogenesis), independently corroborating the 2021 and 2024 Pradel-lab results","pmids":["39445826"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"SET10 (PF3D7_1221000) is a nuclear histone methyltransferase in P. falciparum whose primary in vivo catalytic activity is monomethylation of H3K18 (not H3K4 as originally reported); it is not essential for blood-stage viability, var gene regulation, or gametocytogenesis, but its deficiency reduces intraerythrocytic growth and de-represses transcripts linked to red blood cell remodeling, and it participates in a broad nuclear chromatin-modulation network encompassing ApiAP2 transcription factors, PfHDAC1, PfMORC, PfISWI, RNA Pol II mediators, and DNA replication licensing factors."},"narrative":{"mechanistic_narrative":"SET10 (PF3D7_1221000) is a nuclear histone-lysine methyltransferase of Plasmodium falciparum whose principal in vivo catalytic activity is monomethylation of histone H3 at lysine 18 (H3K18me1); genetic deficiency abolishes H3K18me1 without reducing H3K4 methylation, revising the original assignment of SET10 as an H3K4-specific enzyme required for antigenic variation [PMID:39445823, PMID:22264509]. SET10 localizes to the nucleus with peak abundance in schizonts and distinct subnuclear patterns that differ between asexual and sexual stages [PMID:19765590, PMID:39445823, PMID:39445826]. It is dispensable for blood-stage viability, mutually exclusive var gene expression, var switching, sexual conversion, and gametocyte differentiation, but its loss reduces intraerythrocytic growth [PMID:33536326, PMID:39445823, PMID:39445826]. Consistent with a repressive role for the H3K18me1 mark, SET10 knockout de-represses transcripts encoding red-blood-cell-remodeling and antigenic-variation proteins in schizonts [PMID:39445823]. Proximity-labeling places SET10 within a broad nuclear chromatin-modulation network that includes ApiAP2 transcription factors, PfHDAC1, PfMORC, PfISWI, RNA polymerase II mediators, and DNA replication licensing factors [PMID:39445823].","teleology":[{"year":2009,"claim":"Establishing where SET10 acts in the nucleus was the first step toward assigning it a chromatin-regulatory role, and it was localized to distinct perinuclear sub-compartments.","evidence":"GFP/HA epitope tagging and fluorescence microscopy in P. falciparum","pmids":["19765590"],"confidence":"Medium","gaps":["No catalytic activity or target chromatin loci defined","Functional role inferred from localization only"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"claim":"To assign a molecular function, SET10 was characterized as an H3K4 methyltransferase confined to the active var expression site and reported essential for keeping that locus poised through division, framing it as a driver of antigenic variation.","evidence":"Fluorescence localization, histone methyltransferase activity assay, and genetic disruption with var expression analysis in P. falciparum","pmids":["22264509"],"confidence":"Low","gaps":["The essentiality and H3K4 substrate assignments were subsequently contradicted by conditional KO studies","Single-lab result not independently replicated"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"claim":"Whether SET10 is genuinely essential for viability and var regulation was tested by clean disruption, which showed it is neither, directly contradicting the 2012 model.","evidence":"Gene knockout with var expression analysis by RT-PCR/RNA-seq in P. falciparum","pmids":["33536326"],"confidence":"Medium","gaps":["Negative result did not resolve the true catalytic substrate of SET10","No positive phenotype identified in this study"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"claim":"The true in vivo substrate was resolved: SET10 deficiency abolishes H3K18me1 but leaves H3K4 methylation intact, redefining SET10 as an H3K18 monomethyltransferase rather than an H3K4 enzyme.","evidence":"KO/KD parasite lines with antibody-based histone mark profiling in P. falciparum","pmids":["39445823"],"confidence":"Medium","gaps":["Genome-wide distribution of H3K18me1 not mapped","Direct enzymatic reconstitution not shown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"claim":"Phenotypic profiling defined the cellular consequence of SET10 loss and linked its repressive mark to transcriptional control: growth is reduced while gametocyte commitment is unaffected, and KO de-represses RBC-remodeling and antigenic-variation transcripts in schizonts.","evidence":"Tagged KO/KD lines with growth, gametocyte commitment, and localization assays plus comparative RNA-seq of KO schizonts in P. falciparum","pmids":["39445823"],"confidence":"Medium","gaps":["Repression not directly linked to H3K18me1 occupancy at the affected loci","Mechanism connecting reduced growth to transcriptional changes unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"claim":"To place SET10 in its regulatory context, proximity labeling defined an extensive nuclear interaction network spanning transcription factors, chromatin remodelers, Pol II mediators, and replication licensing factors.","evidence":"TurboID proximity labeling coupled with mass spectrometry in P. falciparum","pmids":["39445823"],"confidence":"Medium","gaps":["No reciprocal Co-IP validation of interactors","Functional significance of individual interactions untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"claim":"An independent rigorous conditional KO confirmed that SET10 is dispensable across asexual and sexual development, corroborating the non-essential model while noting stage-specific subnuclear patterns and female-gametocyte-specific expression.","evidence":"Iterative genome editing conditional KO with RNA-seq, var switching, gametocyte differentiation assays, and subnuclear localization microscopy in P. falciparum","pmids":["39445826"],"confidence":"High","gaps":["Function in female gametocytes not defined despite specific expression","Basis of stage-specific subnuclear repositioning unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"How SET10-deposited H3K18me1 is targeted to specific loci and how its network partners direct its repressive activity remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No genome-wide H3K18me1 occupancy map linked to de-repressed genes","Recruitment mechanism and role of ApiAP2/PfHDAC1/PfMORC/PfISWI partners untested","Function in female gametocytes uncharacterized"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":["APIAP2 TRANSCRIPTION FACTORS [#5]","PFHDAC1 [#5]","PFMORC [#5]","PFISWI [#5]","RNA POLYMERASE II MEDIATORS [#5]","DNA REPLICATION LICENSING FACTORS [#5]"],"other_free_text":["Peak protein expression in schizonts; nuclear localization with distinct subnuclear patterns in asexual versus sexual stages [#4, #7]","Expressed specifically in female gametocytes [#7]","Dispensable for blood-stage viability, mutually exclusive var expression, var switching, sexual conversion, and gametocytogenesis; KO reduces intraerythrocytic growth [#2, #4, #7]","H3K18me1 inferred to act as a repressive mark based on de-repression of RBC-remodeling and antigenic-variation transcripts in KO schizonts [#6]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"16410041","id":"PMC_16410041","title":"The malaria parasite Plasmodium falciparum histones: organization, expression, and acetylation.","date":"2006","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/16410041","citation_count":155,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfH3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"22264509","id":"PMC_22264509","title":"PfSET10, a Plasmodium falciparum methyltransferase, maintains the active var gene in a poised state during parasite division.","date":"2012","source":"Cell host & microbe","url":"https://pubmed.ncbi.nlm.nih.gov/22264509","citation_count":115,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfSET10"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"22260922","id":"PMC_22260922","title":"Plasmodium falciparum histones induce endothelial proinflammatory response and barrier dysfunction.","date":"2012","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/22260922","citation_count":93,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfH3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"19765590","id":"PMC_19765590","title":"Potential epigenetic regulatory proteins localise to distinct nuclear sub-compartments in Plasmodium falciparum.","date":"2009","source":"International journal for parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/19765590","citation_count":65,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["curated_ref"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"27555062","id":"PMC_27555062","title":"H3.3 demarcates GC-rich coding and subtelomeric regions and serves as potential memory mark for virulence gene expression in Plasmodium falciparum.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/27555062","citation_count":28,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfH3"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"33536326","id":"PMC_33536326","title":"The Role of the Histone Methyltransferase PfSET10 in Antigenic Variation by Malaria Parasites: a Cautionary Tale.","date":"2021","source":"mSphere","url":"https://pubmed.ncbi.nlm.nih.gov/33536326","citation_count":11,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfSET10"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"39445823","id":"PMC_39445823","title":"The Plasmodium falciparum histone methyltransferase SET10 participates in a chromatin modulation network crucial for intraerythrocytic development.","date":"2024","source":"mSphere","url":"https://pubmed.ncbi.nlm.nih.gov/39445823","citation_count":6,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SET10","PfSET10"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"39445826","id":"PMC_39445826","title":"The Plasmodium falciparum histone methyltransferase PfSET10 is dispensable for the regulation of antigenic variation and gene expression in blood-stage parasites.","date":"2024","source":"mSphere","url":"https://pubmed.ncbi.nlm.nih.gov/39445826","citation_count":3,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfSET10"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"23076248","id":"PMC_23076248","title":"Unveiling malaria's \"cloak of invisibility\": the role of PfSET10 in the genetic control of P. falciparum virulence.","date":"2012","source":"Virulence","url":"https://pubmed.ncbi.nlm.nih.gov/23076248","citation_count":2,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfSET10"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7499,"output_tokens":2098,"usd":0.026984,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7361,"output_tokens":3192,"usd":0.058303,"stage2_stop_reason":"end_turn"},"total_usd":0.085287,"stage1_batch_id":"msgbatch_011BPjN2BL33F8cJXD1r7V7T","stage2_batch_id":"msgbatch_01Qwg6vP7qxkpL6Gsc7tajsb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"SET10 (PF3D7_1221000) localizes to distinct perinuclear sub-compartments in the P. falciparum nucleus, as determined by GFP/HA tagging and localization analysis, suggesting a role in virulence gene regulation at the nuclear periphery.\",\n      \"method\": \"GFP/HA epitope tagging and fluorescence microscopy localization\",\n      \"journal\": \"International journal for parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization experiment with functional inference, single lab, no functional rescue or epistasis\",\n      \"pmids\": [\"19765590\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"SET10 (PF3D7_1221000) was identified as an H3K4 methyltransferase that localizes exclusively to the perinuclear active var gene expression site and was reported to be required to maintain the active var gene in a poised state during parasite division, thereby supporting antigenic variation.\",\n      \"method\": \"Protein localization (fluorescence microscopy), histone methyltransferase activity assay, genetic disruption with var gene expression analysis\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 2 / Weak — findings from a single lab subsequently contradicted by multiple independent studies using more rigorous conditional KO approaches; confidence downgraded accordingly\",\n      \"pmids\": [\"22264509\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Genetic disruption of SET10 (PF3D7_1221000) is not lethal to P. falciparum and has no detectable effect on var gene expression, directly contradicting earlier reports that SET10 is essential for parasite viability and antigenic variation.\",\n      \"method\": \"Gene disruption (knockout) with var gene expression analysis by RT-PCR/RNA-seq\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined gene expression phenotype (negative result), replicated independently by two other groups in 2024\",\n      \"pmids\": [\"33536326\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SET10 (PF3D7_1221000) deficiency in P. falciparum abolishes H3K18 monomethylation (H3K18me1) but does not reduce H3K4 methylation, indicating its primary catalytic activity in vivo is methylation of H3 at lysine 18, not lysine 4.\",\n      \"method\": \"Knockout/knockdown parasite lines with histone methylation profiling (antibody-based detection of specific marks)\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with specific histone mark readout, single lab, not yet independently replicated\",\n      \"pmids\": [\"39445823\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SET10 (PF3D7_1221000) deficiency reduces intraerythrocytic growth but does not affect gametocyte commitment or maturation; SET10 shows nuclear localization with peak protein levels in schizonts.\",\n      \"method\": \"Tagged KO and KD parasite lines with growth assays, gametocyte commitment assays, and localization by fluorescence microscopy\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO/KD with multiple phenotypic readouts, single lab\",\n      \"pmids\": [\"39445823\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SET10 (PF3D7_1221000) participates in an extensive nuclear interaction network identified by TurboID proximity labeling coupled with mass spectrometry; key interactors include ApiAP2 transcription factors, PfHDAC1, chromatin modulators PfMORC and PfISWI, mediators of RNA polymerase II, and DNA replication licensing factors.\",\n      \"method\": \"TurboID proximity labeling coupled with mass spectrometry\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity labeling MS identifies interaction network, single lab, no reciprocal Co-IP validation described in abstract\",\n      \"pmids\": [\"39445823\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SET10 (PF3D7_1221000) KO upregulates transcripts encoding proteins linked to red blood cell remodeling and antigenic variation in schizonts, suggesting a repressive function of the H3K18me1 mark it deposits.\",\n      \"method\": \"Comparative transcriptomic profiling (RNA-seq) of PfSET10-KO schizonts\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide RNA-seq with KO, single lab; transcriptional repression inferred but not directly linked to H3K18me1 occupancy at affected loci in the abstract\",\n      \"pmids\": [\"39445823\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SET10 (PF3D7_1221000) is dispensable for mutually exclusive var gene expression, var gene switching, asexual parasite proliferation, sexual conversion, and gametocyte differentiation; conditional KO showed no effect on global gene expression during asexual development or gametocytogenesis. SET10 shows different subnuclear localization patterns in asexual versus sexual stage parasites and is expressed specifically in female gametocytes.\",\n      \"method\": \"Iterative genome editing to generate conditional KO; RNA-seq; var gene switching assays; gametocyte differentiation assays; subnuclear localization by fluorescence microscopy\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous conditional KO with multiple orthogonal phenotypic readouts (growth, switching, RNA-seq, gametocytogenesis), independently corroborating the 2021 and 2024 Pradel-lab results\",\n      \"pmids\": [\"39445826\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"SET10 (PF3D7_1221000) is a nuclear histone methyltransferase in P. falciparum whose primary in vivo catalytic activity is monomethylation of H3K18 (not H3K4 as originally reported); it is not essential for blood-stage viability, var gene regulation, or gametocytogenesis, but its deficiency reduces intraerythrocytic growth and de-represses transcripts linked to red blood cell remodeling, and it participates in a broad nuclear chromatin-modulation network encompassing ApiAP2 transcription factors, PfHDAC1, PfMORC, PfISWI, RNA Pol II mediators, and DNA replication licensing factors.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SET10 (PF3D7_1221000) is a nuclear histone-lysine methyltransferase of Plasmodium falciparum whose principal in vivo catalytic activity is monomethylation of histone H3 at lysine 18 (H3K18me1); genetic deficiency abolishes H3K18me1 without reducing H3K4 methylation, revising the original assignment of SET10 as an H3K4-specific enzyme required for antigenic variation [#3, #1]. SET10 localizes to the nucleus with peak abundance in schizonts and distinct subnuclear patterns that differ between asexual and sexual stages [#0, #4, #7]. It is dispensable for blood-stage viability, mutually exclusive var gene expression, var switching, sexual conversion, and gametocyte differentiation, but its loss reduces intraerythrocytic growth [#2, #4, #7]. Consistent with a repressive role for the H3K18me1 mark, SET10 knockout de-represses transcripts encoding red-blood-cell-remodeling and antigenic-variation proteins in schizonts [#6]. Proximity-labeling places SET10 within a broad nuclear chromatin-modulation network that includes ApiAP2 transcription factors, PfHDAC1, PfMORC, PfISWI, RNA polymerase II mediators, and DNA replication licensing factors [#5].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Establishing where SET10 acts in the nucleus was the first step toward assigning it a chromatin-regulatory role, and it was localized to distinct perinuclear sub-compartments.\",\n      \"evidence\": \"GFP/HA epitope tagging and fluorescence microscopy in P. falciparum\",\n      \"pmids\": [\"19765590\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No catalytic activity or target chromatin loci defined\", \"Functional role inferred from localization only\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"To assign a molecular function, SET10 was characterized as an H3K4 methyltransferase confined to the active var expression site and reported essential for keeping that locus poised through division, framing it as a driver of antigenic variation.\",\n      \"evidence\": \"Fluorescence localization, histone methyltransferase activity assay, and genetic disruption with var expression analysis in P. falciparum\",\n      \"pmids\": [\"22264509\"],\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"The essentiality and H3K4 substrate assignments were subsequently contradicted by conditional KO studies\", \"Single-lab result not independently replicated\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Whether SET10 is genuinely essential for viability and var regulation was tested by clean disruption, which showed it is neither, directly contradicting the 2012 model.\",\n      \"evidence\": \"Gene knockout with var expression analysis by RT-PCR/RNA-seq in P. falciparum\",\n      \"pmids\": [\"33536326\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Negative result did not resolve the true catalytic substrate of SET10\", \"No positive phenotype identified in this study\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"The true in vivo substrate was resolved: SET10 deficiency abolishes H3K18me1 but leaves H3K4 methylation intact, redefining SET10 as an H3K18 monomethyltransferase rather than an H3K4 enzyme.\",\n      \"evidence\": \"KO/KD parasite lines with antibody-based histone mark profiling in P. falciparum\",\n      \"pmids\": [\"39445823\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Genome-wide distribution of H3K18me1 not mapped\", \"Direct enzymatic reconstitution not shown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Phenotypic profiling defined the cellular consequence of SET10 loss and linked its repressive mark to transcriptional control: growth is reduced while gametocyte commitment is unaffected, and KO de-represses RBC-remodeling and antigenic-variation transcripts in schizonts.\",\n      \"evidence\": \"Tagged KO/KD lines with growth, gametocyte commitment, and localization assays plus comparative RNA-seq of KO schizonts in P. falciparum\",\n      \"pmids\": [\"39445823\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Repression not directly linked to H3K18me1 occupancy at the affected loci\", \"Mechanism connecting reduced growth to transcriptional changes unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"To place SET10 in its regulatory context, proximity labeling defined an extensive nuclear interaction network spanning transcription factors, chromatin remodelers, Pol II mediators, and replication licensing factors.\",\n      \"evidence\": \"TurboID proximity labeling coupled with mass spectrometry in P. falciparum\",\n      \"pmids\": [\"39445823\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No reciprocal Co-IP validation of interactors\", \"Functional significance of individual interactions untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"An independent rigorous conditional KO confirmed that SET10 is dispensable across asexual and sexual development, corroborating the non-essential model while noting stage-specific subnuclear patterns and female-gametocyte-specific expression.\",\n      \"evidence\": \"Iterative genome editing conditional KO with RNA-seq, var switching, gametocyte differentiation assays, and subnuclear localization microscopy in P. falciparum\",\n      \"pmids\": [\"39445826\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Function in female gametocytes not defined despite specific expression\", \"Basis of stage-specific subnuclear repositioning unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How SET10-deposited H3K18me1 is targeted to specific loci and how its network partners direct its repressive activity remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No genome-wide H3K18me1 occupancy map linked to de-repressed genes\", \"Recruitment mechanism and role of ApiAP2/PfHDAC1/PfMORC/PfISWI partners untested\", \"Function in female gametocytes uncharacterized\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140945\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0042054\", \"supporting_discovery_ids\": [3, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 4, 7]},\n      {\"term_id\": \"GO:0034399\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0016571\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0045892\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"ApiAP2 transcription factors [#5]\",\n      \"PfHDAC1 [#5]\",\n      \"PfMORC [#5]\",\n      \"PfISWI [#5]\",\n      \"RNA polymerase II mediators [#5]\",\n      \"DNA replication licensing factors [#5]\"\n    ],\n    \"other_free_text\": [\n      \"Peak protein expression in schizonts; nuclear localization with distinct subnuclear patterns in asexual versus sexual stages [#4, #7]\",\n      \"Expressed specifically in female gametocytes [#7]\",\n      \"Dispensable for blood-stage viability, mutually exclusive var expression, var switching, sexual conversion, and gametocytogenesis; KO reduces intraerythrocytic growth [#2, #4, #7]\",\n      \"H3K18me1 inferred to act as a repressive mark based on de-repression of RBC-remodeling and antigenic-variation transcripts in KO schizonts [#6]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1221000","name":null,"product":"histone-lysine N-methyltransferase, H3 lysine-4 specific","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_1436200","name":null,"product":"histone-lysine N-methyltransferase, H3 lysine-4 specific, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1440100","name":null,"product":"histone-lysine N-methyltransferase, H3 lysine-4 specific, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"SET10","evaluation":null}