{"gene":"PF3D7_1148700","run_date":"2026-09-08T16:26:55","timeline":{"discoveries":[{"year":2010,"finding":"GEXP12 (PF3D7_1148700) was identified as a putatively exported protein enriched in the early gametocyte proteome of P. falciparum. Mass spectrometry detected N-terminal processing and N-acetylation at a conserved leucine residue within the Plasmodium export element (PEXEL) pentamotif for related PfGEXP proteins in early but not mature gametocytes, and experimental results confirmed that such proteins are exported into the erythrocyte cytoplasm, supporting a role in host cell remodeling during early gametocytogenesis.","method":"Quantitative label-free comparative proteomics (high-accuracy tandem mass spectrometry) of purified early gametocytes from a GFP-expressing transgenic line; N-terminal processing and N-acetylation detected by MS","journal":"Molecular & cellular proteomics : MCP","confidence":"Low","confidence_rationale":"Tier 3 / Weak — GEXP12 is identified by proteomics as enriched in early gametocytes and belongs to the exported PfGEXP class, but no direct functional experiment or loss-of-function was performed specifically on PF3D7_1148700; mechanistic detail (export, PEXEL processing) is inferred from the class, not demonstrated individually for this protein","pmids":["20332084"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"finding":"GEXP12 (PF3D7_1148700) was identified among eight proteins potentially involved in gametocytogenesis that are carried within extracellular vesicles (EVs) derived from P. falciparum cultures. EVs containing GEXP12 and other proteins were shown to prime uninfected red blood cells to support parasite invasion and differentiation into sexual stages, indicating EV-mediated intercellular communication in gametocyte commitment, though the specific mechanistic contribution of GEXP12 within EVs was not individually tested.","method":"Proteomic identification of EV cargo proteins; functional EV treatment assays measuring gametocyte production after treating P. falciparum cultures or uninfected RBCs with stage-specific EVs","journal":"Journal of extracellular vesicles","confidence":"Low","confidence_rationale":"Tier 3 / Weak — GEXP12 is listed as one of eight EV cargo candidates implicated in gametocytogenesis; the functional EV assay is not specific to GEXP12, and no individual loss-of-function or mechanistic experiment was performed on this protein","pmids":["41147645"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"GEXP12 (PF3D7_1148700) is a PHISTc-domain exported protein enriched in early P. falciparum gametocytes, predicted to be exported into the erythrocyte cytoplasm via the PEXEL motif and detected as cargo in parasite-derived extracellular vesicles implicated in priming red blood cells for gametocyte development, but no direct mechanistic or loss-of-function experiment has established its specific molecular function."},"narrative":{"mechanistic_narrative":"GEXP12 (PF3D7_1148700) is a PHISTc-domain protein of the exported PfGEXP class enriched in the early gametocyte proteome of Plasmodium falciparum, where it is implicated in host erythrocyte remodeling during early sexual-stage development [PMID:20332084]. It carries a PEXEL export element, and the PfGEXP class to which it belongs undergoes N-terminal processing and N-acetylation at a conserved leucine and is exported into the erythrocyte cytoplasm; these export features are established for the class rather than demonstrated individually for GEXP12 [PMID:20332084]. GEXP12 is also detected as cargo within parasite-derived extracellular vesicles that prime uninfected red blood cells to support gametocyte commitment, though its specific contribution within these vesicles was not individually tested [PMID:41147645]. No direct loss-of-function or biochemical experiment has defined the molecular function of PF3D7_1148700 in the available corpus, and its role is inferred entirely from proteomic association with early gametocytes and EV cargo.","teleology":[{"year":2010,"claim":"Establishing which parasite proteins accompany the switch to sexual development, GEXP12 was identified as an early-gametocyte-enriched member of the exported PfGEXP class, framing it as a candidate host-cell remodeling factor during early gametocytogenesis.","evidence":"Quantitative label-free comparative proteomics of purified early gametocytes from a GFP transgenic line, with N-terminal processing and N-acetylation detected by MS","pmids":["20332084"],"confidence":"Low","gaps":["No functional or loss-of-function experiment was performed on PF3D7_1148700 specifically","PEXEL processing and export were shown for the PfGEXP class, not demonstrated individually for GEXP12","No molecular activity, binding partner, or substrate identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"claim":"Asking how parasites communicate to promote sexual commitment, GEXP12 was found among extracellular vesicle cargo proteins whose vesicles prime uninfected red blood cells for gametocyte development, placing GEXP12 in an EV-mediated intercellular signaling context.","evidence":"Proteomic identification of EV cargo plus functional EV-treatment assays measuring gametocyte production after treating cultures or uninfected RBCs with stage-specific EVs","pmids":["41147645"],"confidence":"Low","gaps":["The functional EV priming assay was not specific to GEXP12; it was one of eight candidate cargo proteins","No individual loss-of-function or mechanistic test of GEXP12 within EVs","How GEXP12 is loaded into EVs and whether it acts in the recipient RBC is unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"The specific molecular function of PF3D7_1148700 — its binding partners, biochemical activity, and whether it is required for export, host-cell remodeling, or gametocyte commitment — remains undefined by direct experiment.","evidence":"No direct loss-of-function or biochemical characterization of GEXP12 exists in the available corpus","pmids":[],"confidence":"Low","gaps":["No knockout, knockdown, or complementation phenotype for GEXP12","No demonstrated interaction partners or complex membership for GEXP12 itself","No structural or biochemical activity data"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":[],"other_free_text":["GEXP12 (PF3D7_1148700) is a PHISTc-domain protein of the exported PfGEXP class carrying a PEXEL export element [#0].","Enriched in the early gametocyte proteome of P. falciparum; export into erythrocyte cytoplasm and PEXEL N-terminal processing/N-acetylation are established for the PfGEXP class rather than demonstrated for GEXP12 individually [#0].","Detected as one of eight candidate cargo proteins in parasite-derived extracellular vesicles that prime uninfected RBCs for gametocyte development; GEXP12's individual contribution was not tested [#1].","No direct loss-of-function or biochemical experiment has established the molecular function of PF3D7_1148700."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"20332084","id":"PMC_20332084","title":"Protein export marks the early phase of gametocytogenesis of the human malaria parasite Plasmodium falciparum.","date":"2010","source":"Molecular & cellular proteomics : MCP","url":"https://pubmed.ncbi.nlm.nih.gov/20332084","citation_count":216,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["curated_ref"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"29783949","id":"","title":"Gene copy number variation in natural populations of Plasmodium falciparum in Eastern Africa.","date":"2018","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/29783949","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["GEXP12"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"41147645","id":"","title":"ISEV2025 Abstract Book.","date":"2025","source":"Journal of extracellular vesicles","url":"https://pubmed.ncbi.nlm.nih.gov/41147645","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["GEXP12"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":5111,"output_tokens":878,"usd":0.014252,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":5575,"output_tokens":1793,"usd":0.03635,"stage2_stop_reason":"end_turn"},"total_usd":0.050602,"stage1_batch_id":"msgbatch_01NE1MTa8x1hW7Lo4tAaNzY1","stage2_batch_id":"msgbatch_0141vaQdeFvbo2q39AinvXM9","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2010,\n      \"finding\": \"GEXP12 (PF3D7_1148700) was identified as a putatively exported protein enriched in the early gametocyte proteome of P. falciparum. Mass spectrometry detected N-terminal processing and N-acetylation at a conserved leucine residue within the Plasmodium export element (PEXEL) pentamotif for related PfGEXP proteins in early but not mature gametocytes, and experimental results confirmed that such proteins are exported into the erythrocyte cytoplasm, supporting a role in host cell remodeling during early gametocytogenesis.\",\n      \"method\": \"Quantitative label-free comparative proteomics (high-accuracy tandem mass spectrometry) of purified early gametocytes from a GFP-expressing transgenic line; N-terminal processing and N-acetylation detected by MS\",\n      \"journal\": \"Molecular & cellular proteomics : MCP\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — GEXP12 is identified by proteomics as enriched in early gametocytes and belongs to the exported PfGEXP class, but no direct functional experiment or loss-of-function was performed specifically on PF3D7_1148700; mechanistic detail (export, PEXEL processing) is inferred from the class, not demonstrated individually for this protein\",\n      \"pmids\": [\"20332084\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"GEXP12 (PF3D7_1148700) was identified among eight proteins potentially involved in gametocytogenesis that are carried within extracellular vesicles (EVs) derived from P. falciparum cultures. EVs containing GEXP12 and other proteins were shown to prime uninfected red blood cells to support parasite invasion and differentiation into sexual stages, indicating EV-mediated intercellular communication in gametocyte commitment, though the specific mechanistic contribution of GEXP12 within EVs was not individually tested.\",\n      \"method\": \"Proteomic identification of EV cargo proteins; functional EV treatment assays measuring gametocyte production after treating P. falciparum cultures or uninfected RBCs with stage-specific EVs\",\n      \"journal\": \"Journal of extracellular vesicles\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — GEXP12 is listed as one of eight EV cargo candidates implicated in gametocytogenesis; the functional EV assay is not specific to GEXP12, and no individual loss-of-function or mechanistic experiment was performed on this protein\",\n      \"pmids\": [\"41147645\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"GEXP12 (PF3D7_1148700) is a PHISTc-domain exported protein enriched in early P. falciparum gametocytes, predicted to be exported into the erythrocyte cytoplasm via the PEXEL motif and detected as cargo in parasite-derived extracellular vesicles implicated in priming red blood cells for gametocyte development, but no direct mechanistic or loss-of-function experiment has established its specific molecular function.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GEXP12 (PF3D7_1148700) is a PHISTc-domain protein of the exported PfGEXP class enriched in the early gametocyte proteome of Plasmodium falciparum, where it is implicated in host erythrocyte remodeling during early sexual-stage development [#0]. It carries a PEXEL export element, and the PfGEXP class to which it belongs undergoes N-terminal processing and N-acetylation at a conserved leucine and is exported into the erythrocyte cytoplasm; these export features are established for the class rather than demonstrated individually for GEXP12 [#0]. GEXP12 is also detected as cargo within parasite-derived extracellular vesicles that prime uninfected red blood cells to support gametocyte commitment, though its specific contribution within these vesicles was not individually tested [#1]. No direct loss-of-function or biochemical experiment has defined the molecular function of PF3D7_1148700 in the available corpus, and its role is inferred entirely from proteomic association with early gametocytes and EV cargo.\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Establishing which parasite proteins accompany the switch to sexual development, GEXP12 was identified as an early-gametocyte-enriched member of the exported PfGEXP class, framing it as a candidate host-cell remodeling factor during early gametocytogenesis.\",\n      \"evidence\": \"Quantitative label-free comparative proteomics of purified early gametocytes from a GFP transgenic line, with N-terminal processing and N-acetylation detected by MS\",\n      \"pmids\": [\"20332084\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No functional or loss-of-function experiment was performed on PF3D7_1148700 specifically\",\n        \"PEXEL processing and export were shown for the PfGEXP class, not demonstrated individually for GEXP12\",\n        \"No molecular activity, binding partner, or substrate identified\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Asking how parasites communicate to promote sexual commitment, GEXP12 was found among extracellular vesicle cargo proteins whose vesicles prime uninfected red blood cells for gametocyte development, placing GEXP12 in an EV-mediated intercellular signaling context.\",\n      \"evidence\": \"Proteomic identification of EV cargo plus functional EV-treatment assays measuring gametocyte production after treating cultures or uninfected RBCs with stage-specific EVs\",\n      \"pmids\": [\"41147645\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"The functional EV priming assay was not specific to GEXP12; it was one of eight candidate cargo proteins\",\n        \"No individual loss-of-function or mechanistic test of GEXP12 within EVs\",\n        \"How GEXP12 is loaded into EVs and whether it acts in the recipient RBC is unknown\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The specific molecular function of PF3D7_1148700 — its binding partners, biochemical activity, and whether it is required for export, host-cell remodeling, or gametocyte commitment — remains undefined by direct experiment.\",\n      \"evidence\": \"No direct loss-of-function or biochemical characterization of GEXP12 exists in the available corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No knockout, knockdown, or complementation phenotype for GEXP12\",\n        \"No demonstrated interaction partners or complex membership for GEXP12 itself\",\n        \"No structural or biochemical activity data\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\"term_id\": \"GO:0020030\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:1903561\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0060206\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": [\n      \"GEXP12 (PF3D7_1148700) is a PHISTc-domain protein of the exported PfGEXP class carrying a PEXEL export element [#0].\",\n      \"Enriched in the early gametocyte proteome of P. falciparum; export into erythrocyte cytoplasm and PEXEL N-terminal processing/N-acetylation are established for the PfGEXP class rather than demonstrated for GEXP12 individually [#0].\",\n      \"Detected as one of eight candidate cargo proteins in parasite-derived extracellular vesicles that prime uninfected RBCs for gametocyte development; GEXP12's individual contribution was not tested [#1].\",\n      \"No direct loss-of-function or biochemical experiment has established the molecular function of PF3D7_1148700.\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1148700","name":null,"product":"Plasmodium exported protein (PHISTc), unknown function","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"GEXP12","evaluation":null}