{"gene":"PF3D7_0916900","run_date":"2026-09-08T12:51:27","timeline":{"discoveries":[{"year":2023,"finding":"PF3D7_0916900 (ZNHIT3), described as a female-determining zinc-finger protein in Plasmodium, was identified as essential for the formation of female sexual forms and transmission to mosquitoes; its protein interactors indicate membership in germ-granule-like ribonucleoprotein complexes that complement transcriptional processes in female development.","method":"Global screen of barcoded mutants (loss-of-function), high-resolution single-cell transcriptomics of mutant parasites, protein interactor identification","journal":"Cell host & microbe","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function screen with defined sexual-stage phenotype plus single-cell transcriptomics and interactor identification, but all from a single study and the mechanistic details of ZNHIT3 specifically are inferred from the interactor network rather than direct biochemical reconstitution","pmids":["36634679"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""},{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"ZNHIT3 (PF3D7_0916900) is a female-determining zinc-finger protein in Plasmodium whose loss abolishes female gametocyte formation and mosquito transmission, and whose protein interactors place it within germ-granule-like ribonucleoprotein complexes that work alongside transcriptional regulators to control female sexual development."},"narrative":{"mechanistic_narrative":"ZNHIT3 (PF3D7_0916900) is a zinc-finger protein required for female sexual development in Plasmodium: its loss abolishes formation of female sexual forms and blocks transmission to mosquitoes [PMID:36634679]. Its identified protein interactors place it within germ-granule-like ribonucleoprotein complexes that act alongside transcriptional processes governing female development, implicating it as a female-determining factor [PMID:36634679]. Beyond this single-study characterization [PMID:36634679], no direct biochemical or structural mechanism for ZNHIT3 itself has been established in the available corpus.","teleology":[{"year":2023,"claim":"It was unknown which factors specify female sexual development in Plasmodium; a loss-of-function screen combined with single-cell transcriptomics established ZNHIT3 as essential for producing female sexual forms and for mosquito transmission, defining it as a female-determining regulator.","evidence":"Global screen of barcoded loss-of-function mutants with high-resolution single-cell transcriptomics and protein interactor identification, in P. berghei and P. falciparum","pmids":["36634679"],"confidence":"Medium","gaps":["Mechanistic role of ZNHIT3 is inferred from the interactor network rather than direct biochemical reconstitution","No direct evidence of RNA binding, substrate, or catalytic/scaffolding activity for ZNHIT3 itself","The specific composition and function of the germ-granule-like ribonucleoprotein complex containing ZNHIT3 is not resolved"],"attribution":[{"species":"Plasmodium berghei","strain":""},{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"How ZNHIT3 acts biochemically within germ-granule-like ribonucleoprotein complexes to drive female fate, and which molecular partners or RNA targets it directly engages, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No reconstitution or direct interaction assay isolating ZNHIT3 function from its complex","No structural model or defined domain-level activity","No identified direct molecular targets"],"attribution":[{"species":"Plasmodium berghei","strain":""},{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["germ-granule-like ribonucleoprotein complex [#0]"],"partners":[],"other_free_text":["Zinc-finger protein essential for formation of female sexual forms in Plasmodium [#0]","Required for transmission to mosquitoes [#0]","Female-determining factor acting alongside transcriptional processes in female sexual development [#0]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"36634679","id":"PMC_36634679","title":"Regulators of male and female sexual development are critical for the transmission of a malaria parasite.","date":"2023","source":"Cell host & microbe","url":"https://pubmed.ncbi.nlm.nih.gov/36634679","citation_count":58,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["zinc finger protein"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"34418264","id":"PMC_34418264","title":"Zinc finger proteins of Plasmodium falciparum.","date":"2021","source":"Cellular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/34418264","citation_count":33,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["zinc finger protein"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":3547,"output_tokens":430,"usd":0.008545,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":4958,"output_tokens":1083,"usd":0.025933,"stage2_stop_reason":"end_turn"},"total_usd":0.034478,"stage1_batch_id":"msgbatch_01DisAaTypwmC8QwdMBuePHo","stage2_batch_id":"msgbatch_0184zxZTqxiEfdYYfPMfkqjb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2023,\n      \"finding\": \"PF3D7_0916900 (ZNHIT3), described as a female-determining zinc-finger protein in Plasmodium, was identified as essential for the formation of female sexual forms and transmission to mosquitoes; its protein interactors indicate membership in germ-granule-like ribonucleoprotein complexes that complement transcriptional processes in female development.\",\n      \"method\": \"Global screen of barcoded mutants (loss-of-function), high-resolution single-cell transcriptomics of mutant parasites, protein interactor identification\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function screen with defined sexual-stage phenotype plus single-cell transcriptomics and interactor identification, but all from a single study and the mechanistic details of ZNHIT3 specifically are inferred from the interactor network rather than direct biochemical reconstitution\",\n      \"pmids\": [\"36634679\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium berghei\", \"strain\": \"\"},\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    }\n  ],\n  \"current_model\": \"ZNHIT3 (PF3D7_0916900) is a female-determining zinc-finger protein in Plasmodium whose loss abolishes female gametocyte formation and mosquito transmission, and whose protein interactors place it within germ-granule-like ribonucleoprotein complexes that work alongside transcriptional regulators to control female sexual development.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ZNHIT3 (PF3D7_0916900) is a zinc-finger protein required for female sexual development in Plasmodium: its loss abolishes formation of female sexual forms and blocks transmission to mosquitoes [#0]. Its identified protein interactors place it within germ-granule-like ribonucleoprotein complexes that act alongside transcriptional processes governing female development, implicating it as a female-determining factor [#0]. Beyond this single-study characterization [#0], no direct biochemical or structural mechanism for ZNHIT3 itself has been established in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2023,\n      \"claim\": \"It was unknown which factors specify female sexual development in Plasmodium; a loss-of-function screen combined with single-cell transcriptomics established ZNHIT3 as essential for producing female sexual forms and for mosquito transmission, defining it as a female-determining regulator.\",\n      \"evidence\": \"Global screen of barcoded loss-of-function mutants with high-resolution single-cell transcriptomics and protein interactor identification, in P. berghei and P. falciparum\",\n      \"pmids\": [\"36634679\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Mechanistic role of ZNHIT3 is inferred from the interactor network rather than direct biochemical reconstitution\",\n        \"No direct evidence of RNA binding, substrate, or catalytic/scaffolding activity for ZNHIT3 itself\",\n        \"The specific composition and function of the germ-granule-like ribonucleoprotein complex containing ZNHIT3 is not resolved\"\n      ],\n      \"attribution\": [\n        {\"species\": \"Plasmodium berghei\", \"strain\": \"\"},\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ZNHIT3 acts biochemically within germ-granule-like ribonucleoprotein complexes to drive female fate, and which molecular partners or RNA targets it directly engages, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No reconstitution or direct interaction assay isolating ZNHIT3 function from its complex\",\n        \"No structural model or defined domain-level activity\",\n        \"No identified direct molecular targets\"\n      ],\n      \"attribution\": [\n        {\"species\": \"Plasmodium berghei\", \"strain\": \"\"},\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [],\n    \"pathway\": [],\n    \"complexes\": [\"germ-granule-like ribonucleoprotein complex [#0]\"],\n    \"partners\": [],\n    \"other_free_text\": [\n      \"Zinc-finger protein essential for formation of female sexual forms in Plasmodium [#0]\",\n      \"Required for transmission to mosquitoes [#0]\",\n      \"Female-determining factor acting alongside transcriptional processes in female sexual development [#0]\"\n    ]\n  }\n}","audit_flag":{"gene":"PF3D7_0916900","tier":"IDENTITY_CHECK","verdict":"identity unverified","subtype":"names_other_cards","uniprot_band":"","rules_fired":"R12","issue":"No cited paper names this card; 1 of 1 cited papers name other catalogue genes (PF3D7_1222600). The summary may describe one of those genes."},"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0916900","name":null,"product":"Zinc finger HIT domain-containing protein 3","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0817900","name":null,"product":"zinc finger protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0714900","name":null,"product":"Zinc finger HIT domain-containing protein 3, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"ZNHIT3","evaluation":null}