{"gene":"PF3D7_0309200","run_date":"2026-09-07T10:55:51","timeline":{"discoveries":[{"year":2010,"finding":"ARK2 (referred to as Pfark-2 in the paper) was identified as one of three Aurora-related kinases in P. falciparum by kinome re-analysis; attempts to disrupt the Pfark-1 gene (a sibling family member) were unsuccessful, but ARK2 itself was identified and classified as an Aurora-related kinase. No direct functional experiment on ARK2 specifically was reported beyond its identification.","method":"Bioinformatics/kinome analysis and GFP-tagging of the related Pfark-1 (not ARK2 directly)","journal":"Molecular microbiology","confidence":"Low","confidence_rationale":"Tier 4 / Weak — ARK2 identified computationally; no direct experiment on ARK2 reported in this paper","pmids":["21166904"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"The P. falciparum ARK2 orthologue in Toxoplasma gondii (TgArk2) localizes to the mitotic spindle and intranuclear mitotic structures in tachyzoites. Disruption of TgArk2 revealed no essential function for tachyzoite propagation in vitro, contrasting with P. falciparum and P. berghei ARK2 orthologues which are reported essential for erythrocytic schizogony.","method":"GFP-tagging of endogenous TgArk2 for localization; gene knockout for functional assessment in T. gondii","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct gene knockout with phenotypic readout and GFP localization, but results are from T. gondii orthologue, not P. falciparum ARK2 directly","pmids":["26833682"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"Gene expression analysis of P. falciparum cell cycle re-entry after G1 arrest showed that ark2 transcript expression is upregulated upon re-entry into the cell cycle, grouping it with mitotic kinases whose expression is induced at the G1/S transition.","method":"Gene expression (transcriptomic) analysis following DFMO-induced G1 arrest and polyamine-driven cell cycle re-entry","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 4 / Weak — expression correlation only, no direct protein-level or functional experiment on ARK2","pmids":["30409996"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"finding":"ARK2 in P. berghei localizes primarily to spindle microtubules in the vicinity of kinetochores during both mitosis and meiosis in sexual transmission stages (male gametogony). Interactomic (mass spectrometry) and co-localization studies identified the microtubule plus-end binding protein EB1, MISFIT, and Myosin-K as putative ARK2-associated interactors, with no conserved canonical eukaryotic Aurora scaffold proteins detected. Gene function studies showed that ARK2 and EB1 have complementary roles in driving endomitotic division and parasite transmission through the mosquito.","method":"Super-resolution microscopy, live-cell fluorescence imaging, mass spectrometry-based interactomics, co-localization studies, gene function (knockout/conditional) studies","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (super-resolution microscopy, MS interactomics, live imaging, gene function studies) in a single study, peer-reviewed publication","pmids":["37704606"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2023,"finding":"ARK2 in P. berghei localizes to the spindle apparatus associated with kinetochores during both mitosis and meiosis. Interactomics revealed a novel spindle scaffold for ARK2 including EB1 but lacking conserved Aurora scaffold proteins. ARK2 and EB1 have complementary functions in endomitotic divisions and parasite transmission (preprint version of the same findings as PMID:37704606).","method":"Super-resolution microscopy, mass spectrometry, live-cell fluorescence imaging, gene function studies","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — same study as published version (PMID:37704606), preprint; confidence slightly reduced as it is a preprint","pmids":["36778504","36798191"],"is_preprint":true,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2024,"finding":"In P. falciparum, GFP-tagged ARK2 shows a distinct and exclusive spatiotemporal association with specific mitotic structures during schizogony that is non-overlapping with ARK1 and ARK3. ARK2 (along with ARK1) shows male-specific expression in late-stage gametocytes, consistent with a role in endomitosis during male gametogenesis. ARK2's localization pattern suggests non-overlapping roles with ARK1 in centriolar plaque maturation, spindle assembly, kinetochore-spindle attachment, and chromosome segregation.","method":"Transgenic parasite lines expressing GFP-tagged PfARK2; fluorescence microscopy throughout schizogony and gametocytogenesis","journal":"mSphere","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by GFP-tagging in live parasites across multiple stages, systematic comparison across all three ARKs, but functional consequences of ARK2 localization not directly tested by loss-of-function in this study","pmids":["39235260"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"ARK2 (PF3D7_0309200) is an Aurora-related serine/threonine kinase in Plasmodium that localizes to spindle microtubules in the vicinity of kinetochores during both mitosis and meiosis in sexual transmission stages; in P. berghei, it interacts with the microtubule plus-end binding protein EB1 (along with MISFIT and Myosin-K) via a novel spindle scaffold lacking canonical eukaryotic Aurora activators, and ARK2 and EB1 cooperate to drive endomitotic chromosome segregation and mosquito-stage parasite transmission; in P. falciparum asexual stages, ARK2 displays a distinct spatiotemporal association with mitotic structures suggesting non-overlapping roles with ARK1 in centriolar plaque maturation, spindle assembly, and chromosome segregation, with male-specific expression in gametocytes consistent with a role in male gametogenesis."},"narrative":{"mechanistic_narrative":"ARK2 (PF3D7_0309200) is an Aurora-related serine/threonine kinase of Plasmodium that functions in the atypical mitotic and meiotic divisions of the parasite, localizing to spindle microtubules in the vicinity of kinetochores during both mitosis and meiosis in sexual transmission stages [PMID:37704606]. In P. berghei, ARK2 operates through a non-canonical spindle scaffold: interactomic and co-localization studies identified the microtubule plus-end binding protein EB1, MISFIT, and Myosin-K as associated partners, with no conserved eukaryotic Aurora activator/scaffold proteins detected, and ARK2 together with EB1 drives endomitotic chromosome segregation and parasite transmission through the mosquito [PMID:37704606]. In P. falciparum asexual schizogony, GFP-tagged ARK2 shows a distinct spatiotemporal association with mitotic structures that is non-overlapping with the sibling kinases ARK1 and ARK3, consistent with a specialized role in centriolar plaque maturation, spindle assembly, and chromosome segregation, and ARK2 is expressed male-specifically in late gametocytes, implicating it in male gametogenesis [PMID:39235260]. The kinase's substrates and its catalytic regulation in the absence of canonical Aurora activators have not been characterized in the available corpus.","teleology":[{"year":2010,"claim":"Establishing that Plasmodium encodes multiple Aurora-related kinases raised the question of how each is deployed, first requiring ARK2 to be recognized as a distinct family member.","evidence":"Kinome re-analysis of P. falciparum classifying ARK2 as one of three Aurora-related kinases","pmids":["21166904"],"confidence":"Low","gaps":["No direct experiment on ARK2 itself; identification is computational","No localization, interaction, or function established for ARK2"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"claim":"Orthologue analysis addressed whether Aurora-related kinase function is conserved across apicomplexans, showing the ARK2 orthologue localizes to mitotic structures but is dispensable in one lineage.","evidence":"GFP-tagging and gene knockout of the T. gondii orthologue TgArk2 in tachyzoites","pmids":["26833682"],"confidence":"Medium","gaps":["Findings are from T. gondii, not P. falciparum ARK2 directly","Essentiality contrast with Plasmodium orthologues not tested in the same system","No substrate or interactor identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"Cell-cycle transcriptomics placed ARK2 among mitotic kinases induced at the G1/S transition, linking its expression to cell cycle re-entry.","evidence":"Transcriptomic analysis after DFMO-induced G1 arrest and polyamine-driven re-entry in P. falciparum","pmids":["30409996"],"confidence":"Low","gaps":["Expression correlation only, no protein-level or functional data","Does not establish when or where ARK2 protein acts"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"claim":"Defining ARK2's molecular environment resolved how an Aurora kinase operates without canonical activators, revealing a novel EB1-containing spindle scaffold and a functional role in endomitotic division and transmission.","evidence":"Super-resolution and live-cell imaging, MS interactomics, and gene function studies in P. berghei (also reported as preprint)","pmids":["37704606","36778504","36798191"],"confidence":"High","gaps":["ARK2 substrates not identified","Mechanism of ARK2 catalytic activation without canonical Aurora scaffolds unresolved","Direct roles of MISFIT and Myosin-K relative to ARK2 not dissected"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2024,"claim":"Systematic comparison of the three Plasmodium Aurora kinases established that ARK2 occupies a spatially and temporally distinct niche from its siblings, arguing for non-redundant functions in mitotic structure maturation and male gametogenesis.","evidence":"GFP-tagged PfARK2 fluorescence microscopy across schizogony and gametocytogenesis in P. falciparum","pmids":["39235260"],"confidence":"Medium","gaps":["Functional consequences of ARK2 localization not tested by loss-of-function in this study","Male-specific role in gametogenesis inferred from expression, not perturbed directly","Kinetochore-spindle attachment role inferred from localization only"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"The direct substrates of ARK2 and the mechanism by which it is catalytically activated in the absence of canonical Aurora scaffold/activator proteins remain unknown.","evidence":"","pmids":[],"confidence":"High","gaps":["No phosphorylation substrate identified","No structural or biochemical account of ARK2 kinase activation","Distinct P. falciparum ARK2 function not confirmed by loss-of-function in asexual stages"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["Non-canonical spindle scaffold with EB1, MISFIT, and Myosin-K (P. berghei) [#3]"],"partners":["EB1 (MICROTUBULE PLUS-END BINDING PROTEIN) [#3]","MISFIT [#3]","MYOSIN-K [#3]"],"other_free_text":["One of three Plasmodium Aurora-related kinases (ARK1, ARK2, ARK3); ARK2 occupies a spatiotemporally distinct, non-overlapping niche from its siblings [#0, #5]","ark2 transcript induced at the G1/S transition upon cell-cycle re-entry in P. falciparum [#2]","Male-specific expression in late-stage P. falciparum gametocytes [#5]","The T. gondii orthologue TgArk2 is dispensable for tachyzoite propagation, contrasting with reported essentiality in Plasmodium erythrocytic schizogony [#1]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"15479470","id":"PMC_15479470","title":"Protein kinases of the human malaria parasite Plasmodium falciparum: the kinome of a divergent eukaryote.","date":"2004","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/15479470","citation_count":421,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["curated_ref"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"22127061","id":"PMC_22127061","title":"Global kinomic and phospho-proteomic analyses of the human malaria parasite Plasmodium falciparum.","date":"2011","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/22127061","citation_count":288,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["curated_ref"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"21166904","id":"PMC_21166904","title":"An essential Aurora-related kinase transiently associates with spindle pole bodies during Plasmodium falciparum erythrocytic schizogony.","date":"2010","source":"Molecular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/21166904","citation_count":68,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["curated_ref"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"26833682","id":"PMC_26833682","title":"The conserved apicomplexan Aurora kinase TgArk3 is involved in endodyogeny, duplication rate and parasite virulence.","date":"2016","source":"Cellular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/26833682","citation_count":37,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ARK2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"30409996","id":"PMC_30409996","title":"Inducing controlled cell cycle arrest and re-entry during asexual proliferation of Plasmodium falciparum malaria parasites.","date":"2018","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/30409996","citation_count":35,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ARK2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"37704606","id":"PMC_37704606","title":"Plasmodium ARK2 and EB1 drive unconventional spindle dynamics, during chromosome segregation in sexual transmission stages.","date":"2023","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/37704606","citation_count":29,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ARK2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"39235260","id":"PMC_39235260","title":"The three Plasmodium falciparum Aurora-related kinases display distinct temporal and spatial associations with mitotic structures in asexual blood stage parasites and gametocytes.","date":"2024","source":"mSphere","url":"https://pubmed.ncbi.nlm.nih.gov/39235260","citation_count":10,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfARK2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"36798191","id":"PMC_36798191","title":"Plasmodium ARK2-EB1 axis drives the unconventional spindle dynamics, scaffold formation and chromosome segregation of sexual transmission stages.","date":"2023","source":"Research square","url":"https://pubmed.ncbi.nlm.nih.gov/36798191","citation_count":2,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ARK2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"36778504","id":"PMC_36778504","title":"Plasmodium ARK2-EB1 axis drives the unconventional spindle dynamics, scaffold formation and chromosome segregation of sexual transmission stages.","date":"2023","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/36778504","citation_count":1,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["ARK2"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":7815,"output_tokens":1960,"usd":0.026423,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7148,"output_tokens":2690,"usd":0.051495,"stage2_stop_reason":"end_turn"},"total_usd":0.077918,"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\": 2010,\n      \"finding\": \"ARK2 (referred to as Pfark-2 in the paper) was identified as one of three Aurora-related kinases in P. falciparum by kinome re-analysis; attempts to disrupt the Pfark-1 gene (a sibling family member) were unsuccessful, but ARK2 itself was identified and classified as an Aurora-related kinase. No direct functional experiment on ARK2 specifically was reported beyond its identification.\",\n      \"method\": \"Bioinformatics/kinome analysis and GFP-tagging of the related Pfark-1 (not ARK2 directly)\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — ARK2 identified computationally; no direct experiment on ARK2 reported in this paper\",\n      \"pmids\": [\"21166904\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The P. falciparum ARK2 orthologue in Toxoplasma gondii (TgArk2) localizes to the mitotic spindle and intranuclear mitotic structures in tachyzoites. Disruption of TgArk2 revealed no essential function for tachyzoite propagation in vitro, contrasting with P. falciparum and P. berghei ARK2 orthologues which are reported essential for erythrocytic schizogony.\",\n      \"method\": \"GFP-tagging of endogenous TgArk2 for localization; gene knockout for functional assessment in T. gondii\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct gene knockout with phenotypic readout and GFP localization, but results are from T. gondii orthologue, not P. falciparum ARK2 directly\",\n      \"pmids\": [\"26833682\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Gene expression analysis of P. falciparum cell cycle re-entry after G1 arrest showed that ark2 transcript expression is upregulated upon re-entry into the cell cycle, grouping it with mitotic kinases whose expression is induced at the G1/S transition.\",\n      \"method\": \"Gene expression (transcriptomic) analysis following DFMO-induced G1 arrest and polyamine-driven cell cycle re-entry\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — expression correlation only, no direct protein-level or functional experiment on ARK2\",\n      \"pmids\": [\"30409996\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ARK2 in P. berghei localizes primarily to spindle microtubules in the vicinity of kinetochores during both mitosis and meiosis in sexual transmission stages (male gametogony). Interactomic (mass spectrometry) and co-localization studies identified the microtubule plus-end binding protein EB1, MISFIT, and Myosin-K as putative ARK2-associated interactors, with no conserved canonical eukaryotic Aurora scaffold proteins detected. Gene function studies showed that ARK2 and EB1 have complementary roles in driving endomitotic division and parasite transmission through the mosquito.\",\n      \"method\": \"Super-resolution microscopy, live-cell fluorescence imaging, mass spectrometry-based interactomics, co-localization studies, gene function (knockout/conditional) studies\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (super-resolution microscopy, MS interactomics, live imaging, gene function studies) in a single study, peer-reviewed publication\",\n      \"pmids\": [\"37704606\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ARK2 in P. berghei localizes to the spindle apparatus associated with kinetochores during both mitosis and meiosis. Interactomics revealed a novel spindle scaffold for ARK2 including EB1 but lacking conserved Aurora scaffold proteins. ARK2 and EB1 have complementary functions in endomitotic divisions and parasite transmission (preprint version of the same findings as PMID:37704606).\",\n      \"method\": \"Super-resolution microscopy, mass spectrometry, live-cell fluorescence imaging, gene function studies\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — same study as published version (PMID:37704606), preprint; confidence slightly reduced as it is a preprint\",\n      \"pmids\": [\"36778504\", \"36798191\"],\n      \"is_preprint\": true,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In P. falciparum, GFP-tagged ARK2 shows a distinct and exclusive spatiotemporal association with specific mitotic structures during schizogony that is non-overlapping with ARK1 and ARK3. ARK2 (along with ARK1) shows male-specific expression in late-stage gametocytes, consistent with a role in endomitosis during male gametogenesis. ARK2's localization pattern suggests non-overlapping roles with ARK1 in centriolar plaque maturation, spindle assembly, kinetochore-spindle attachment, and chromosome segregation.\",\n      \"method\": \"Transgenic parasite lines expressing GFP-tagged PfARK2; fluorescence microscopy throughout schizogony and gametocytogenesis\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by GFP-tagging in live parasites across multiple stages, systematic comparison across all three ARKs, but functional consequences of ARK2 localization not directly tested by loss-of-function in this study\",\n      \"pmids\": [\"39235260\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"ARK2 (PF3D7_0309200) is an Aurora-related serine/threonine kinase in Plasmodium that localizes to spindle microtubules in the vicinity of kinetochores during both mitosis and meiosis in sexual transmission stages; in P. berghei, it interacts with the microtubule plus-end binding protein EB1 (along with MISFIT and Myosin-K) via a novel spindle scaffold lacking canonical eukaryotic Aurora activators, and ARK2 and EB1 cooperate to drive endomitotic chromosome segregation and mosquito-stage parasite transmission; in P. falciparum asexual stages, ARK2 displays a distinct spatiotemporal association with mitotic structures suggesting non-overlapping roles with ARK1 in centriolar plaque maturation, spindle assembly, and chromosome segregation, with male-specific expression in gametocytes consistent with a role in male gametogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ARK2 (PF3D7_0309200) is an Aurora-related serine/threonine kinase of Plasmodium that functions in the atypical mitotic and meiotic divisions of the parasite, localizing to spindle microtubules in the vicinity of kinetochores during both mitosis and meiosis in sexual transmission stages [#3]. In P. berghei, ARK2 operates through a non-canonical spindle scaffold: interactomic and co-localization studies identified the microtubule plus-end binding protein EB1, MISFIT, and Myosin-K as associated partners, with no conserved eukaryotic Aurora activator/scaffold proteins detected, and ARK2 together with EB1 drives endomitotic chromosome segregation and parasite transmission through the mosquito [#3]. In P. falciparum asexual schizogony, GFP-tagged ARK2 shows a distinct spatiotemporal association with mitotic structures that is non-overlapping with the sibling kinases ARK1 and ARK3, consistent with a specialized role in centriolar plaque maturation, spindle assembly, and chromosome segregation, and ARK2 is expressed male-specifically in late gametocytes, implicating it in male gametogenesis [#5]. The kinase's substrates and its catalytic regulation in the absence of canonical Aurora activators have not been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2010,\n      \"claim\": \"Establishing that Plasmodium encodes multiple Aurora-related kinases raised the question of how each is deployed, first requiring ARK2 to be recognized as a distinct family member.\",\n      \"evidence\": \"Kinome re-analysis of P. falciparum classifying ARK2 as one of three Aurora-related kinases\",\n      \"pmids\": [\"21166904\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct experiment on ARK2 itself; identification is computational\", \"No localization, interaction, or function established for ARK2\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Orthologue analysis addressed whether Aurora-related kinase function is conserved across apicomplexans, showing the ARK2 orthologue localizes to mitotic structures but is dispensable in one lineage.\",\n      \"evidence\": \"GFP-tagging and gene knockout of the T. gondii orthologue TgArk2 in tachyzoites\",\n      \"pmids\": [\"26833682\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Findings are from T. gondii, not P. falciparum ARK2 directly\", \"Essentiality contrast with Plasmodium orthologues not tested in the same system\", \"No substrate or interactor identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Cell-cycle transcriptomics placed ARK2 among mitotic kinases induced at the G1/S transition, linking its expression to cell cycle re-entry.\",\n      \"evidence\": \"Transcriptomic analysis after DFMO-induced G1 arrest and polyamine-driven re-entry in P. falciparum\",\n      \"pmids\": [\"30409996\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Expression correlation only, no protein-level or functional data\", \"Does not establish when or where ARK2 protein acts\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defining ARK2's molecular environment resolved how an Aurora kinase operates without canonical activators, revealing a novel EB1-containing spindle scaffold and a functional role in endomitotic division and transmission.\",\n      \"evidence\": \"Super-resolution and live-cell imaging, MS interactomics, and gene function studies in P. berghei (also reported as preprint)\",\n      \"pmids\": [\"37704606\", \"36778504\", \"36798191\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"ARK2 substrates not identified\", \"Mechanism of ARK2 catalytic activation without canonical Aurora scaffolds unresolved\", \"Direct roles of MISFIT and Myosin-K relative to ARK2 not dissected\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Systematic comparison of the three Plasmodium Aurora kinases established that ARK2 occupies a spatially and temporally distinct niche from its siblings, arguing for non-redundant functions in mitotic structure maturation and male gametogenesis.\",\n      \"evidence\": \"GFP-tagged PfARK2 fluorescence microscopy across schizogony and gametocytogenesis in P. falciparum\",\n      \"pmids\": [\"39235260\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequences of ARK2 localization not tested by loss-of-function in this study\", \"Male-specific role in gametogenesis inferred from expression, not perturbed directly\", \"Kinetochore-spindle attachment role inferred from localization only\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct substrates of ARK2 and the mechanism by which it is catalytically activated in the absence of canonical Aurora scaffold/activator proteins remain unknown.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No phosphorylation substrate identified\", \"No structural or biochemical account of ARK2 kinase activation\", \"Distinct P. falciparum ARK2 function not confirmed by loss-of-function in asexual stages\"],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0004674\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005876\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0000776\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0005819\", \"supporting_discovery_ids\": [1, 3, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0007059\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0007067\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"GO:0048232\", \"supporting_discovery_ids\": [3, 5]}\n    ],\n    \"complexes\": [\n      \"Non-canonical spindle scaffold with EB1, MISFIT, and Myosin-K (P. berghei) [#3]\"\n    ],\n    \"partners\": [\n      \"EB1 (microtubule plus-end binding protein) [#3]\",\n      \"MISFIT [#3]\",\n      \"Myosin-K [#3]\"\n    ],\n    \"other_free_text\": [\n      \"One of three Plasmodium Aurora-related kinases (ARK1, ARK2, ARK3); ARK2 occupies a spatiotemporally distinct, non-overlapping niche from its siblings [#0, #5]\",\n      \"ark2 transcript induced at the G1/S transition upon cell-cycle re-entry in P. falciparum [#2]\",\n      \"Male-specific expression in late-stage P. falciparum gametocytes [#5]\",\n      \"The T. gondii orthologue TgArk2 is dispensable for tachyzoite propagation, contrasting with reported essentiality in Plasmodium erythrocytic schizogony [#1]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0309200","name":null,"product":"aurora-related kinase ARK2, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0407400","name":null,"product":"serine/threonine protein kinase ARK2, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0833500","name":null,"product":"serine/threonine protein kinase ARK2, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"ARK2","evaluation":null}