{"gene":"PF3D7_0207400","run_date":"2026-09-08T19:44:17","timeline":{"discoveries":[{"year":2002,"finding":"SERA7 (PF3D7_0207400) gene disruption in P. falciparum blood stages was successful, demonstrating that SERA7 is dispensable for erythrocytic cycle maintenance, in contrast to the centrally clustered SERA4-6 which could not be disrupted.","method":"Targeted gene disruption (knockout) of chromosome 2 SERA genes with assessment of blood-stage growth","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean gene knockout with defined growth phenotype (dispensability), single lab, direct genetic experiment","pmids":["12228245"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"finding":"mRNA for SERA7 is synthesized late in the erythrocytic cycle, but SERA7 is not among the genes substantially up-regulated at that time (unlike SERA4-6); antibody data did not confirm SERA7 protein synthesis in blood stages.","method":"Reverse transcriptase-PCR and microarray expression profiling; western blotting with SERA-specific antibodies","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods (RT-PCR + microarray + antibody), single lab","pmids":["12228245"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"The P. berghei ortholog of SERA7 (PbSERA4/PBANKA_0304800, sharing 44% identity and 57% similarity with PF3D7_0207400, and 66% identity within the papain-like cysteine protease domain) is expressed and proteolytically processed in liver and blood stages; targeted disruption of PbSERA4 results in viable blood-stage parasites but a reduced capacity to initiate blood-stage infection after mosquito transmission, attributable to inefficient egress from infected liver cells.","method":"Generation of PbSERA4-specific antisera; fluorescent protein tagging (live imaging); targeted gene disruption (knockout); in vivo infection assays; cell culture egress assays","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal use of antisera, fluorescent tagging, and clean KO with defined cellular egress phenotype, multiple orthogonal methods in one study","pmids":["32956401"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":2020,"finding":"PbSERA4 (the P. berghei ortholog of PF3D7_0207400/SERA7) contains conserved catalytic residues of the papain family cysteine protease: an N-terminal glutamine, a catalytic cysteine, a central histidine, and a C-terminal asparagine forming the oxyanion hole, indicating it is a catalytically competent cysteine-type protease (in contrast to serine-type SERA members).","method":"Sequence alignment and structural annotation of catalytic residues; phylogenetic/domain analysis","journal":"PLoS pathogens","confidence":"Low","confidence_rationale":"Tier 4 / Weak — based on sequence/domain analysis only, no in vitro enzymatic assay confirming catalytic activity","pmids":["32956401"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"},{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"finding":"Recombinant SERA7 ectodomain expressed in a heterologous system migrated at ~30 kDa by SDS-PAGE and western blotting, suggesting complete cleavage at the C-terminus; unlike most other merozoite recombinant proteins, immunoreactivity of SERA7 was not significantly reduced by heat denaturation, indicating it does not prominently display heat-labile (conformational) epitopes.","method":"Recombinant protein expression; SDS-PAGE and western blot; heat-denaturation ELISA with immune sera","journal":"Malaria journal","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, biochemical characterization of recombinant protein without in-parasite functional validation","pmids":["24620899"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"Phylogenetic analysis suggested that the ancestral gene from which all serine-type SERA genes evolved was a cysteine-type gene likely corresponding to either SERA6 or SERA7 (PF3D7_0207400) in P. falciparum, positioning SERA7 as an evolutionarily ancestral cysteine-type member of the SERA family.","method":"Phylogenetic analysis (cited as supporting evidence within the study of SERA5 function)","journal":"PLoS pathogens","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational/phylogenetic inference, no direct experiment on SERA7 itself","pmids":["28683142"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"In single-cell RNA-seq clustering of P. falciparum intraerythrocytic parasites, SERA7 transcript was a marker gene for Cluster 1 (along with SERA4 and SERA5), suggesting co-regulated late-stage expression with other SERA family members.","method":"Single-cell RNA-sequencing (scRNA-seq) on a microfluidic platform; RNA fluorescence in situ hybridization (RNA-FISH) for validation","journal":"PLoS genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — transcriptional clustering result, single lab, no direct functional experiment on SERA7","pmids":["31856180"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"ChIP-seq showed that the promoter of sera7 (PF3D7_0207400) is bound by the transcription factor PfAP2-I but not PfAP2-G in P. falciparum schizonts, implicating PfAP2-I as a transcriptional regulator of SERA7 expression.","method":"Chromatin immunoprecipitation followed by sequencing (ChIP-seq) with tagged PfAP2-G and PfAP2-I in parallel from the same parasite extracts","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal ChIP-seq in same parasite line, two factors compared in parallel, single lab","pmids":["32198457"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]}],"current_model":"SERA7 (PF3D7_0207400) is a cysteine-type papain-like protease expressed late in the P. falciparum erythrocytic cycle whose gene is dispensable for blood-stage growth; its P. berghei ortholog (PbSERA4) is proteolytically processed in the liver and blood stages and contributes to efficient egress of merozoites from liver-stage infected cells, while its promoter in P. falciparum is bound by the transcription factor PfAP2-I."},"narrative":{"mechanistic_narrative":"SERA7 (PF3D7_0207400) is a member of the P. falciparum serine repeat antigen (SERA) family whose transcript is synthesized late in the erythrocytic cycle but whose gene is dispensable for blood-stage growth, as demonstrated by successful targeted disruption in contrast to the essential centrally clustered SERA4-6 [PMID:12228245]. Its late-stage expression is co-regulated with other SERA members and driven by the transcription factor PfAP2-I, which binds the sera7 promoter in schizonts [PMID:31856180, PMID:32198457]. The most direct functional insight derives from the P. berghei ortholog PbSERA4, which is proteolytically processed in liver and blood stages and contributes to efficient egress of merozoites from liver-stage infected cells, such that its disruption yields viable blood-stage parasites but a reduced capacity to initiate blood-stage infection after mosquito transmission [PMID:32956401]. Sequence and domain analysis positions SERA7 as a cysteine-type papain-like protease bearing conserved catalytic residues, distinguishing it from the serine-type SERA members [PMID:32956401]. Beyond these findings, the enzymatic activity, substrates, and in-parasite function of the P. falciparum protein itself have not been directly characterized in the available corpus.","teleology":[{"year":2002,"claim":"Establishing whether SERA7 is required for asexual replication was needed to place it within the essential-versus-redundant architecture of the SERA locus; its successful knockout showed it is dispensable for the blood-stage cycle, unlike the essential central SERA members.","evidence":"Targeted gene disruption in P. falciparum blood stages with growth-phenotype assessment","pmids":["12228245"],"confidence":"Medium","gaps":["Dispensability in blood stages does not exclude a role in other life-cycle stages","No protein-level detection to link genotype to expressed product"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"claim":"Defining the timing and level of SERA7 expression addressed whether it behaves like the up-regulated central SERA members; RT-PCR and microarray showed late-cycle mRNA but no substantial up-regulation, and antibodies failed to confirm blood-stage protein.","evidence":"RT-PCR and microarray profiling plus western blotting with SERA-specific antibodies in P. falciparum","pmids":["12228245"],"confidence":"Medium","gaps":["Absence of antibody signal leaves protein expression in blood stages unresolved","No information on translation efficiency or protein turnover"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"claim":"Biochemical characterization of the recombinant ectodomain tested how the protein is processed and folded; it migrated at ~30 kDa consistent with C-terminal cleavage and lacked prominent heat-labile conformational epitopes.","evidence":"Recombinant expression, SDS-PAGE/western blot, and heat-denaturation ELISA with immune sera in a P. falciparum context","pmids":["24620899"],"confidence":"Low","gaps":["Recombinant biochemistry without in-parasite functional validation","Processing pattern of native parasite protein not established","No enzymatic activity assessed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"Phylogenetic reconstruction asked where SERA7 sits in the evolution of the family; it placed SERA7 (with SERA6) near the ancestral cysteine-type gene from which serine-type SERAs derived.","evidence":"Phylogenetic inference within a study of SERA5 function in P. falciparum","pmids":["28683142"],"confidence":"Low","gaps":["Computational inference with no direct experiment on SERA7","Ancestral placement does not establish current function"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"claim":"Determining the enzyme class predicted for SERA7 clarified whether it is a functional protease; catalytic-residue analysis of the P. berghei ortholog identified an intact papain-family cysteine protease catalytic set, marking it as a cysteine-type rather than serine-type member.","evidence":"Sequence alignment and structural annotation of catalytic residues in P. berghei PbSERA4 (also inferred for P. falciparum SERA7)","pmids":["32956401"],"confidence":"Low","gaps":["No in vitro enzymatic assay confirming catalytic activity","Substrates and cleavage specificity unknown"],"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"},{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"claim":"The functional role of the ortholog was resolved in P. berghei, addressing what SERA7-like proteases do in vivo; PbSERA4 is processed in liver and blood stages and its loss impairs egress from liver cells and reduces establishment of blood-stage infection after transmission.","evidence":"Ortholog-specific antisera, fluorescent tagging, gene disruption, in vivo infection and egress assays in P. berghei ANKA","pmids":["32956401"],"confidence":"High","gaps":["Phenotype defined in P. berghei; equivalent liver-stage role of P. falciparum SERA7 not tested","Molecular substrates driving egress not identified"],"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":2020,"claim":"Placing SERA7 in the transcriptional regulatory network identified an upstream regulator; single-cell RNA-seq showed co-regulated late-stage expression with SERA4/SERA5, and ChIP-seq showed PfAP2-I, but not PfAP2-G, binds the sera7 promoter.","evidence":"scRNA-seq with RNA-FISH validation and reciprocal PfAP2-G/PfAP2-I ChIP-seq in P. falciparum schizonts (3D7)","pmids":["31856180","32198457"],"confidence":"Medium","gaps":["Promoter binding does not establish functional dependence of expression on PfAP2-I","Regulation in stages other than schizonts not addressed"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium falciparum","strain":"3D7"}]},{"year":null,"claim":"Whether the P. falciparum SERA7 protein is enzymatically active, what it cleaves, and whether it performs the egress-related role demonstrated for its P. berghei ortholog remain unresolved.","evidence":"No direct enzymatic or in-parasite functional study of P. falciparum SERA7 in the corpus","pmids":[],"confidence":"Low","gaps":["No in vitro protease activity or substrate identification for SERA7","No demonstration of native protein expression or localization in P. falciparum","Liver-stage function untested in P. falciparum"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":["PFAP2-I (TRANSCRIPTIONAL REGULATOR BINDING THE SERA7 PROMOTER)"],"other_free_text":["Gene dispensable for P. falciparum blood-stage growth, in contrast to essential central SERA4-6 [#0]","Transcript synthesized late in the erythrocytic cycle and co-clusters with SERA4/SERA5 [#1, #6]","P. berghei ortholog PbSERA4 processed in liver and blood stages; contributes to merozoite egress from liver cells [#2]","Predicted papain-family cysteine-type protease with conserved catalytic residues, distinct from serine-type SERAs [#3]","Phylogenetically placed as an ancestral cysteine-type SERA member [#5]","Recombinant ectodomain migrates at ~30 kDa and lacks prominent heat-labile epitopes [#4]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"12228245","id":"PMC_12228245","title":"A subset of Plasmodium falciparum SERA genes are expressed and appear to play an important role in the erythrocytic cycle.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12228245","citation_count":137,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"17609844","id":"PMC_17609844","title":"Phylogeny and evolution of the SERA multigene family in the genus Plasmodium.","date":"2007","source":"Journal of molecular evolution","url":"https://pubmed.ncbi.nlm.nih.gov/17609844","citation_count":31,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7","PfSERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"32956401","id":"","title":"A Plasmodium cysteine protease required for efficient transition from the liver infection stage.","date":"2020","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/32956401","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"32252804","id":"","title":"Characteristic features of the SERA multigene family in the malaria parasite.","date":"2020","source":"Parasites & vectors","url":"https://pubmed.ncbi.nlm.nih.gov/32252804","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"37122725","id":"","title":"Characterization of a novel Plasmodium falciparum merozoite surface antigen and potential vaccine target.","date":"2023","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/37122725","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"31856180","id":"","title":"Latent transcriptional variations of individual Plasmodium falciparum uncovered by single-cell RNA-seq and fluorescence imaging.","date":"2019","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31856180","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"32198457","id":"","title":"Dissecting the role of PfAP2-G in malaria gametocytogenesis.","date":"2020","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/32198457","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"30995911","id":"","title":"Hospital-derived antibody profiles of malaria patients in Southwest India.","date":"2019","source":"Malaria journal","url":"https://pubmed.ncbi.nlm.nih.gov/30995911","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"24620899","id":"","title":"Towards a comprehensive Plasmodium falciparum merozoite cell surface and secreted recombinant protein library.","date":"2014","source":"Malaria journal","url":"https://pubmed.ncbi.nlm.nih.gov/24620899","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"28683142","id":"","title":"The Plasmodium falciparum pseudoprotease SERA5 regulates the kinetics and efficiency of malaria parasite egress from host erythrocytes.","date":"2017","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/28683142","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"21423628","id":"","title":"Clues to evolution of the SERA multigene family in 18 Plasmodium species.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21423628","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"21984903","id":"","title":"Identification of Plasmodium vivax proteins with potential role in invasion using sequence redundancy reduction and profile hidden Markov models.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21984903","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"20039882","id":"","title":"The Plasmodium serine-type SERA proteases display distinct expression patterns and non-essential in vivo roles during life cycle progression of the malaria parasite.","date":"2009","source":"Cellular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/20039882","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"16389297","id":"","title":"A Plasmodium whole-genome synteny map: indels and synteny breakpoints as foci for species-specific genes.","date":"2005","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/16389297","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["SERA7"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":16920,"output_tokens":2190,"usd":0.041805,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7481,"output_tokens":3193,"usd":0.058615,"stage2_stop_reason":"end_turn"},"total_usd":0.10042,"stage1_batch_id":"msgbatch_01SRp5hyRc82zNjddxyCCXGk","stage2_batch_id":"msgbatch_01K3BTmBazRo3pRrMvyaPMTY","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"SERA7 (PF3D7_0207400) gene disruption in P. falciparum blood stages was successful, demonstrating that SERA7 is dispensable for erythrocytic cycle maintenance, in contrast to the centrally clustered SERA4-6 which could not be disrupted.\",\n      \"method\": \"Targeted gene disruption (knockout) of chromosome 2 SERA genes with assessment of blood-stage growth\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean gene knockout with defined growth phenotype (dispensability), single lab, direct genetic experiment\",\n      \"pmids\": [\"12228245\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"mRNA for SERA7 is synthesized late in the erythrocytic cycle, but SERA7 is not among the genes substantially up-regulated at that time (unlike SERA4-6); antibody data did not confirm SERA7 protein synthesis in blood stages.\",\n      \"method\": \"Reverse transcriptase-PCR and microarray expression profiling; western blotting with SERA-specific antibodies\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods (RT-PCR + microarray + antibody), single lab\",\n      \"pmids\": [\"12228245\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"The P. berghei ortholog of SERA7 (PbSERA4/PBANKA_0304800, sharing 44% identity and 57% similarity with PF3D7_0207400, and 66% identity within the papain-like cysteine protease domain) is expressed and proteolytically processed in liver and blood stages; targeted disruption of PbSERA4 results in viable blood-stage parasites but a reduced capacity to initiate blood-stage infection after mosquito transmission, attributable to inefficient egress from infected liver cells.\",\n      \"method\": \"Generation of PbSERA4-specific antisera; fluorescent protein tagging (live imaging); targeted gene disruption (knockout); in vivo infection assays; cell culture egress assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal use of antisera, fluorescent tagging, and clean KO with defined cellular egress phenotype, multiple orthogonal methods in one study\",\n      \"pmids\": [\"32956401\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PbSERA4 (the P. berghei ortholog of PF3D7_0207400/SERA7) contains conserved catalytic residues of the papain family cysteine protease: an N-terminal glutamine, a catalytic cysteine, a central histidine, and a C-terminal asparagine forming the oxyanion hole, indicating it is a catalytically competent cysteine-type protease (in contrast to serine-type SERA members).\",\n      \"method\": \"Sequence alignment and structural annotation of catalytic residues; phylogenetic/domain analysis\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — based on sequence/domain analysis only, no in vitro enzymatic assay confirming catalytic activity\",\n      \"pmids\": [\"32956401\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Recombinant SERA7 ectodomain expressed in a heterologous system migrated at ~30 kDa by SDS-PAGE and western blotting, suggesting complete cleavage at the C-terminus; unlike most other merozoite recombinant proteins, immunoreactivity of SERA7 was not significantly reduced by heat denaturation, indicating it does not prominently display heat-labile (conformational) epitopes.\",\n      \"method\": \"Recombinant protein expression; SDS-PAGE and western blot; heat-denaturation ELISA with immune sera\",\n      \"journal\": \"Malaria journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, biochemical characterization of recombinant protein without in-parasite functional validation\",\n      \"pmids\": [\"24620899\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Phylogenetic analysis suggested that the ancestral gene from which all serine-type SERA genes evolved was a cysteine-type gene likely corresponding to either SERA6 or SERA7 (PF3D7_0207400) in P. falciparum, positioning SERA7 as an evolutionarily ancestral cysteine-type member of the SERA family.\",\n      \"method\": \"Phylogenetic analysis (cited as supporting evidence within the study of SERA5 function)\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational/phylogenetic inference, no direct experiment on SERA7 itself\",\n      \"pmids\": [\"28683142\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"In single-cell RNA-seq clustering of P. falciparum intraerythrocytic parasites, SERA7 transcript was a marker gene for Cluster 1 (along with SERA4 and SERA5), suggesting co-regulated late-stage expression with other SERA family members.\",\n      \"method\": \"Single-cell RNA-sequencing (scRNA-seq) on a microfluidic platform; RNA fluorescence in situ hybridization (RNA-FISH) for validation\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — transcriptional clustering result, single lab, no direct functional experiment on SERA7\",\n      \"pmids\": [\"31856180\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ChIP-seq showed that the promoter of sera7 (PF3D7_0207400) is bound by the transcription factor PfAP2-I but not PfAP2-G in P. falciparum schizonts, implicating PfAP2-I as a transcriptional regulator of SERA7 expression.\",\n      \"method\": \"Chromatin immunoprecipitation followed by sequencing (ChIP-seq) with tagged PfAP2-G and PfAP2-I in parallel from the same parasite extracts\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal ChIP-seq in same parasite line, two factors compared in parallel, single lab\",\n      \"pmids\": [\"32198457\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    }\n  ],\n  \"current_model\": \"SERA7 (PF3D7_0207400) is a cysteine-type papain-like protease expressed late in the P. falciparum erythrocytic cycle whose gene is dispensable for blood-stage growth; its P. berghei ortholog (PbSERA4) is proteolytically processed in the liver and blood stages and contributes to efficient egress of merozoites from liver-stage infected cells, while its promoter in P. falciparum is bound by the transcription factor PfAP2-I.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SERA7 (PF3D7_0207400) is a member of the P. falciparum serine repeat antigen (SERA) family whose transcript is synthesized late in the erythrocytic cycle but whose gene is dispensable for blood-stage growth, as demonstrated by successful targeted disruption in contrast to the essential centrally clustered SERA4-6 [#0, #1]. Its late-stage expression is co-regulated with other SERA members and driven by the transcription factor PfAP2-I, which binds the sera7 promoter in schizonts [#6, #7]. The most direct functional insight derives from the P. berghei ortholog PbSERA4, which is proteolytically processed in liver and blood stages and contributes to efficient egress of merozoites from liver-stage infected cells, such that its disruption yields viable blood-stage parasites but a reduced capacity to initiate blood-stage infection after mosquito transmission [#2]. Sequence and domain analysis positions SERA7 as a cysteine-type papain-like protease bearing conserved catalytic residues, distinguishing it from the serine-type SERA members [#3]. Beyond these findings, the enzymatic activity, substrates, and in-parasite function of the P. falciparum protein itself have not been directly characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Establishing whether SERA7 is required for asexual replication was needed to place it within the essential-versus-redundant architecture of the SERA locus; its successful knockout showed it is dispensable for the blood-stage cycle, unlike the essential central SERA members.\",\n      \"evidence\": \"Targeted gene disruption in P. falciparum blood stages with growth-phenotype assessment\",\n      \"pmids\": [\"12228245\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Dispensability in blood stages does not exclude a role in other life-cycle stages\",\n        \"No protein-level detection to link genotype to expressed product\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defining the timing and level of SERA7 expression addressed whether it behaves like the up-regulated central SERA members; RT-PCR and microarray showed late-cycle mRNA but no substantial up-regulation, and antibodies failed to confirm blood-stage protein.\",\n      \"evidence\": \"RT-PCR and microarray profiling plus western blotting with SERA-specific antibodies in P. falciparum\",\n      \"pmids\": [\"12228245\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Absence of antibody signal leaves protein expression in blood stages unresolved\",\n        \"No information on translation efficiency or protein turnover\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Biochemical characterization of the recombinant ectodomain tested how the protein is processed and folded; it migrated at ~30 kDa consistent with C-terminal cleavage and lacked prominent heat-labile conformational epitopes.\",\n      \"evidence\": \"Recombinant expression, SDS-PAGE/western blot, and heat-denaturation ELISA with immune sera in a P. falciparum context\",\n      \"pmids\": [\"24620899\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Recombinant biochemistry without in-parasite functional validation\",\n        \"Processing pattern of native parasite protein not established\",\n        \"No enzymatic activity assessed\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Phylogenetic reconstruction asked where SERA7 sits in the evolution of the family; it placed SERA7 (with SERA6) near the ancestral cysteine-type gene from which serine-type SERAs derived.\",\n      \"evidence\": \"Phylogenetic inference within a study of SERA5 function in P. falciparum\",\n      \"pmids\": [\"28683142\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Computational inference with no direct experiment on SERA7\",\n        \"Ancestral placement does not establish current function\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Determining the enzyme class predicted for SERA7 clarified whether it is a functional protease; catalytic-residue analysis of the P. berghei ortholog identified an intact papain-family cysteine protease catalytic set, marking it as a cysteine-type rather than serine-type member.\",\n      \"evidence\": \"Sequence alignment and structural annotation of catalytic residues in P. berghei PbSERA4 (also inferred for P. falciparum SERA7)\",\n      \"pmids\": [\"32956401\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No in vitro enzymatic assay confirming catalytic activity\",\n        \"Substrates and cleavage specificity unknown\"\n      ],\n      \"attribution\": [\n        {\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"},\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The functional role of the ortholog was resolved in P. berghei, addressing what SERA7-like proteases do in vivo; PbSERA4 is processed in liver and blood stages and its loss impairs egress from liver cells and reduces establishment of blood-stage infection after transmission.\",\n      \"evidence\": \"Ortholog-specific antisera, fluorescent tagging, gene disruption, in vivo infection and egress assays in P. berghei ANKA\",\n      \"pmids\": [\"32956401\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Phenotype defined in P. berghei; equivalent liver-stage role of P. falciparum SERA7 not tested\",\n        \"Molecular substrates driving egress not identified\"\n      ],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Placing SERA7 in the transcriptional regulatory network identified an upstream regulator; single-cell RNA-seq showed co-regulated late-stage expression with SERA4/SERA5, and ChIP-seq showed PfAP2-I, but not PfAP2-G, binds the sera7 promoter.\",\n      \"evidence\": \"scRNA-seq with RNA-FISH validation and reciprocal PfAP2-G/PfAP2-I ChIP-seq in P. falciparum schizonts (3D7)\",\n      \"pmids\": [\"31856180\", \"32198457\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Promoter binding does not establish functional dependence of expression on PfAP2-I\",\n        \"Regulation in stages other than schizonts not addressed\"\n      ],\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"},\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether the P. falciparum SERA7 protein is enzymatically active, what it cleaves, and whether it performs the egress-related role demonstrated for its P. berghei ortholog remain unresolved.\",\n      \"evidence\": \"No direct enzymatic or in-parasite functional study of P. falciparum SERA7 in the corpus\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No in vitro protease activity or substrate identification for SERA7\",\n        \"No demonstration of native protein expression or localization in P. falciparum\",\n        \"Liver-stage function untested in P. falciparum\"\n      ],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008234\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"GO:0051701\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PfAP2-I (transcriptional regulator binding the sera7 promoter)\"],\n    \"other_free_text\": [\n      \"Gene dispensable for P. falciparum blood-stage growth, in contrast to essential central SERA4-6 [#0]\",\n      \"Transcript synthesized late in the erythrocytic cycle and co-clusters with SERA4/SERA5 [#1, #6]\",\n      \"P. berghei ortholog PbSERA4 processed in liver and blood stages; contributes to merozoite egress from liver cells [#2]\",\n      \"Predicted papain-family cysteine-type protease with conserved catalytic residues, distinct from serine-type SERAs [#3]\",\n      \"Phylogenetically placed as an ancestral cysteine-type SERA member [#5]\",\n      \"Recombinant ectodomain migrates at ~30 kDa and lacks prominent heat-labile epitopes [#4]\"\n    ]\n  }\n}\n```","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0207400","name":null,"product":"serine repeat antigen 7","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"SERA7","evaluation":null}