{"gene":"TG_200385","gene_symbol":"BFD1","run_date":"2026-09-10T21:09:19","timeline":{"discoveries":[{"year":2020,"finding":"BFD1 is a Myb-like transcription factor that is necessary and sufficient for tachyzoite-to-bradyzoite differentiation in Toxoplasma gondii. BFD1 accumulates during stress conditions, its synthetic (ectopic) expression is sufficient to drive differentiation, and it binds the promoters of many stage-specific bradyzoite genes, acting as a master transcriptional regulator of differentiation.","method":"Cas9-mediated genetic screen, single-cell transcriptional profiling, ectopic expression (gain-of-function), chromatin immunoprecipitation (promoter binding), loss-of-function in cell culture and in mice","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic (KO and overexpression) plus ChIP promoter binding, validated in vivo in mice; multiple orthogonal methods in a single rigorous study","pmids":["31955846"],"is_preprint":false,"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2025,"finding":"The chromatin modifiers MORC and HDAC3 epistatically regulate BFD1, placing BFD1 downstream of these epigenetic regulators in the bradyzoite differentiation pathway. BFD1 controls expression of a subset of bradyzoite genes (e.g., BCLA) while a distinct subset of bradyzoite genes (e.g., BSM) is regulated independently of BFD1, indicating multilayered transcriptional control of stage conversion.","method":"Genetic epistasis analysis (double mutants/knockdowns of MORC, HDAC3, and BFD1), gene expression profiling of BFD1-dependent vs. BFD1-independent bradyzoite genes","journal":"EMBO molecular medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis established by genetic experiments in a single study; abstract does not detail all orthogonal methods used","pmids":["40389644"],"is_preprint":false,"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2025,"finding":"A GID/CTLH-type E3 ubiquitin ligase complex (TgGID) regulates translational repression of BFD1 through its 3' UTR, linking glucose-sensing and ubiquitination-dependent proteostasis to control of the key differentiation transcription factor BFD1.","method":"CRISPR screen for differentiation-deficient mutants under glucose-limiting conditions, functional characterization of TgGID complex, 3' UTR reporter assays","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — CRISPR screen plus 3' UTR functional link established in a single preprint study; mechanistic detail is compelling but not yet peer-reviewed","pmids":["40766703"],"is_preprint":true,"attribution":[{"species":"Toxoplasma gondii","strain":""}]}],"current_model":"BFD1 is a Myb-like transcription factor in Toxoplasma gondii that accumulates during stress and acts as a master switch for tachyzoite-to-bradyzoite differentiation by binding and activating promoters of stage-specific bradyzoite genes; it is placed downstream of the chromatin modifiers MORC and HDAC3, and its expression is itself post-transcriptionally regulated through its 3' UTR by a GID/CTLH-type E3 ubiquitin ligase complex that senses glucose availability."},"narrative":{"mechanistic_narrative":"BFD1 is a Myb-like transcription factor that serves as the master regulator of tachyzoite-to-bradyzoite differentiation in Toxoplasma gondii [PMID:31955846]. It accumulates under stress, and its ectopic expression is sufficient to drive differentiation while its loss blocks stage conversion, establishing it as both necessary and sufficient for the switch; it acts by binding the promoters of many stage-specific bradyzoite genes to activate their expression [PMID:31955846]. Within the differentiation pathway BFD1 lies downstream of the chromatin modifiers MORC and HDAC3, and it controls only a subset of bradyzoite genes (e.g., BCLA) while others (e.g., BSM) are regulated independently, indicating multilayered transcriptional control of stage conversion [PMID:40389644]. BFD1 abundance is itself constrained post-transcriptionally: a GID/CTLH-type E3 ubiquitin ligase complex (TgGID) mediates translational repression of BFD1 through its 3' UTR, coupling glucose-sensing and ubiquitination-dependent proteostasis to the differentiation decision [PMID:40766703].","teleology":[{"year":2020,"claim":"Whether a single dedicated regulator governs the tachyzoite-to-bradyzoite switch was unknown; identifying BFD1 as necessary and sufficient established a master transcriptional switch for differentiation.","evidence":"Cas9 genetic screen, single-cell transcriptional profiling, ectopic gain-of-function expression, ChIP promoter binding, and loss-of-function in culture and in mice","pmids":["31955846"],"confidence":"High","gaps":["Direct DNA-binding sequence specificity and full regulon not resolved","Upstream signals triggering BFD1 accumulation during stress not defined","Whether BFD1 acts alone or requires cofactors at target promoters not established"],"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2025,"claim":"How BFD1 integrates with upstream epigenetic control was unclear; epistasis placed BFD1 downstream of MORC and HDAC3 and revealed a BFD1-independent branch of bradyzoite gene regulation.","evidence":"Genetic epistasis with double mutants/knockdowns of MORC, HDAC3 and BFD1 plus expression profiling of BFD1-dependent vs. -independent genes","pmids":["40389644"],"confidence":"Medium","gaps":["Molecular mechanism by which MORC/HDAC3 chromatin state controls BFD1 not detailed","Identity of the regulator(s) driving the BFD1-independent bradyzoite gene subset unknown"],"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":2025,"claim":"The mechanism restraining BFD1 protein levels was unknown; a GID/CTLH E3 ubiquitin ligase complex acting through the BFD1 3' UTR links glucose availability and proteostasis to the differentiation decision.","evidence":"CRISPR screen for differentiation-deficient mutants under glucose limitation, TgGID complex characterization, and 3' UTR reporter assays (preprint)","pmids":["40766703"],"confidence":"Medium","gaps":["Not yet peer-reviewed","Direct ubiquitination substrate(s) and how 3' UTR couples to the ligase complex not fully defined","Physiological glucose thresholds triggering the response not established"],"attribution":[{"species":"Toxoplasma gondii","strain":""}]},{"year":null,"claim":"The upstream stress and nutrient signals that converge on BFD1 accumulation, and the full BFD1 target regulon, remain to be defined.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Signaling pathway connecting stress sensing to BFD1 accumulation unknown","Complete set of BFD1 direct promoter targets not mapped"],"attribution":[{"species":"Toxoplasma gondii","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":[],"partners":["MORC (EPISTATIC UPSTREAM REGULATOR)","HDAC3 (EPISTATIC UPSTREAM REGULATOR)","TGGID GID/CTLH E3 UBIQUITIN LIGASE COMPLEX (POST-TRANSCRIPTIONAL REGULATOR VIA 3' UTR)"],"other_free_text":["Master transcriptional switch for tachyzoite-to-bradyzoite differentiation; ectopic expression sufficient to drive stage conversion [#0]","Controls a defined subset of bradyzoite genes (e.g., BCLA); a BSM-type subset is BFD1-independent [#1]","Protein/expression level regulated post-transcriptionally through its 3' UTR under glucose-limiting conditions [#2]"]},"strain_conflicts":[]},"prefetch_data":{},"corpus_meta":[{"pmid":"2768467","id":"PMC_2768467","title":"Direct and sensitive detection of a pathogenic protozoan, Toxoplasma gondii, by polymerase chain reaction.","date":"1989","source":"Journal of clinical microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/2768467","citation_count":645,"is_preprint":false},{"pmid":"10675747","id":"PMC_10675747","title":"Identification of a 200- to 300-fold repetitive 529 bp DNA fragment in Toxoplasma 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Toxoplasma gondii in cerebrospinal fluid from AIDS patients by polymerase chain reaction.","date":"1992","source":"Journal of clinical microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/1452673","citation_count":64,"is_preprint":false},{"pmid":"40389644","id":"PMC_40389644","title":"Uncovering biomarkers for chronic toxoplasmosis detection highlights alternative pathways shaping parasite dormancy.","date":"2025","source":"EMBO molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40389644","citation_count":3,"is_preprint":false},{"pmid":"40766703","id":"PMC_40766703","title":"Differentiation of Toxoplasma into latent forms is linked to central carbon metabolism and requires a GID/CTLH-type E3 ubiquitin ligase.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/40766703","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":19639,"output_tokens":1018,"usd":0.037094,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":5886,"output_tokens":2205,"usd":0.042278,"stage2_stop_reason":"end_turn"},"total_usd":0.079372,"stage1_batch_id":"msgbatch_018xTxyBPcQFK9jdgubtxgsj","stage2_batch_id":"msgbatch_01UiG5BTaJP7BvKKL6RLeyv2","note":"batch pricing = 50% of standard","corrective_rerun":"2026-09-10 wrong-gene rerun (round-4 rules)","corrective_reason":"paper list: removed papers about other genes"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2020,\n      \"finding\": \"BFD1 is a Myb-like transcription factor that is necessary and sufficient for tachyzoite-to-bradyzoite differentiation in Toxoplasma gondii. BFD1 accumulates during stress conditions, its synthetic (ectopic) expression is sufficient to drive differentiation, and it binds the promoters of many stage-specific bradyzoite genes, acting as a master transcriptional regulator of differentiation.\",\n      \"method\": \"Cas9-mediated genetic screen, single-cell transcriptional profiling, ectopic expression (gain-of-function), chromatin immunoprecipitation (promoter binding), loss-of-function in cell culture and in mice\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic (KO and overexpression) plus ChIP promoter binding, validated in vivo in mice; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"31955846\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The chromatin modifiers MORC and HDAC3 epistatically regulate BFD1, placing BFD1 downstream of these epigenetic regulators in the bradyzoite differentiation pathway. BFD1 controls expression of a subset of bradyzoite genes (e.g., BCLA) while a distinct subset of bradyzoite genes (e.g., BSM) is regulated independently of BFD1, indicating multilayered transcriptional control of stage conversion.\",\n      \"method\": \"Genetic epistasis analysis (double mutants/knockdowns of MORC, HDAC3, and BFD1), gene expression profiling of BFD1-dependent vs. BFD1-independent bradyzoite genes\",\n      \"journal\": \"EMBO molecular medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis established by genetic experiments in a single study; abstract does not detail all orthogonal methods used\",\n      \"pmids\": [\"40389644\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A GID/CTLH-type E3 ubiquitin ligase complex (TgGID) regulates translational repression of BFD1 through its 3' UTR, linking glucose-sensing and ubiquitination-dependent proteostasis to control of the key differentiation transcription factor BFD1.\",\n      \"method\": \"CRISPR screen for differentiation-deficient mutants under glucose-limiting conditions, functional characterization of TgGID complex, 3' UTR reporter assays\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — CRISPR screen plus 3' UTR functional link established in a single preprint study; mechanistic detail is compelling but not yet peer-reviewed\",\n      \"pmids\": [\"40766703\"],\n      \"is_preprint\": true,\n      \"attribution\": [\n        {\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}\n      ]\n    }\n  ],\n  \"current_model\": \"BFD1 is a Myb-like transcription factor in Toxoplasma gondii that accumulates during stress and acts as a master switch for tachyzoite-to-bradyzoite differentiation by binding and activating promoters of stage-specific bradyzoite genes; it is placed downstream of the chromatin modifiers MORC and HDAC3, and its expression is itself post-transcriptionally regulated through its 3' UTR by a GID/CTLH-type E3 ubiquitin ligase complex that senses glucose availability.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"BFD1 is a Myb-like transcription factor that serves as the master regulator of tachyzoite-to-bradyzoite differentiation in Toxoplasma gondii [#0]. It accumulates under stress, and its ectopic expression is sufficient to drive differentiation while its loss blocks stage conversion, establishing it as both necessary and sufficient for the switch; it acts by binding the promoters of many stage-specific bradyzoite genes to activate their expression [#0]. Within the differentiation pathway BFD1 lies downstream of the chromatin modifiers MORC and HDAC3, and it controls only a subset of bradyzoite genes (e.g., BCLA) while others (e.g., BSM) are regulated independently, indicating multilayered transcriptional control of stage conversion [#1]. BFD1 abundance is itself constrained post-transcriptionally: a GID/CTLH-type E3 ubiquitin ligase complex (TgGID) mediates translational repression of BFD1 through its 3' UTR, coupling glucose-sensing and ubiquitination-dependent proteostasis to the differentiation decision [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2020,\n      \"claim\": \"Whether a single dedicated regulator governs the tachyzoite-to-bradyzoite switch was unknown; identifying BFD1 as necessary and sufficient established a master transcriptional switch for differentiation.\",\n      \"evidence\": \"Cas9 genetic screen, single-cell transcriptional profiling, ectopic gain-of-function expression, ChIP promoter binding, and loss-of-function in culture and in mice\",\n      \"pmids\": [\"31955846\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Direct DNA-binding sequence specificity and full regulon not resolved\",\n        \"Upstream signals triggering BFD1 accumulation during stress not defined\",\n        \"Whether BFD1 acts alone or requires cofactors at target promoters not established\"\n      ],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"How BFD1 integrates with upstream epigenetic control was unclear; epistasis placed BFD1 downstream of MORC and HDAC3 and revealed a BFD1-independent branch of bradyzoite gene regulation.\",\n      \"evidence\": \"Genetic epistasis with double mutants/knockdowns of MORC, HDAC3 and BFD1 plus expression profiling of BFD1-dependent vs. -independent genes\",\n      \"pmids\": [\"40389644\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Molecular mechanism by which MORC/HDAC3 chromatin state controls BFD1 not detailed\",\n        \"Identity of the regulator(s) driving the BFD1-independent bradyzoite gene subset unknown\"\n      ],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"The mechanism restraining BFD1 protein levels was unknown; a GID/CTLH E3 ubiquitin ligase complex acting through the BFD1 3' UTR links glucose availability and proteostasis to the differentiation decision.\",\n      \"evidence\": \"CRISPR screen for differentiation-deficient mutants under glucose limitation, TgGID complex characterization, and 3' UTR reporter assays (preprint)\",\n      \"pmids\": [\"40766703\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Not yet peer-reviewed\",\n        \"Direct ubiquitination substrate(s) and how 3' UTR couples to the ligase complex not fully defined\",\n        \"Physiological glucose thresholds triggering the response not established\"\n      ],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The upstream stress and nutrient signals that converge on BFD1 accumulation, and the full BFD1 target regulon, remain to be defined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Signaling pathway connecting stress sensing to BFD1 accumulation unknown\",\n        \"Complete set of BFD1 direct promoter targets not mapped\"\n      ],\n      \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003700\", \"supporting_discovery_ids\": [0], \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]},\n      {\"term_id\": \"GO:0000981\", \"supporting_discovery_ids\": [0], \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0], \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0030154\", \"supporting_discovery_ids\": [0, 1], \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]},\n      {\"term_id\": \"GO:0006357\", \"supporting_discovery_ids\": [0, 1], \"attribution\": [{\"species\": \"Toxoplasma gondii\", \"strain\": \"\"}]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"MORC (epistatic upstream regulator)\", \"HDAC3 (epistatic upstream regulator)\", \"TgGID GID/CTLH E3 ubiquitin ligase complex (post-transcriptional regulator via 3' UTR)\"],\n    \"other_free_text\": [\n      \"Master transcriptional switch for tachyzoite-to-bradyzoite differentiation; ectopic expression sufficient to drive stage conversion [#0]\",\n      \"Controls a defined subset of bradyzoite genes (e.g., BCLA); a BSM-type subset is BFD1-independent [#1]\",\n      \"Protein/expression level regulated post-transcriptionally through its 3' UTR under glucose-limiting conditions [#2]\"\n    ]\n  },\n  \"strain_conflicts\": []\n}","audit_flag":null,"strains":[{"strain":"ME49","gene_id":"TGME49_200385","name":"BFD1","product":"bradyzoite-formation deficient protein BFD1","uniprot_acc":"S8GIB3","chromosome":"TGME49_chrVIII","start_pos":6832904},{"strain":"GT1","gene_id":"TGGT1_200385","name":null,"product":"Myb family DNA-binding domain-containing protein","uniprot_acc":null,"chromosome":"TGGT1_chrVIII","start_pos":6812546},{"strain":"RH88","gene_id":"TGRH88_083220","name":null,"product":"Myb family DNA-binding domain-containing protein","uniprot_acc":null,"chromosome":"CM023089","start_pos":11963992},{"strain":"VEG","gene_id":"TGVEG_200385","name":null,"product":"Myb family DNA-binding domain-containing protein","uniprot_acc":"V4Z8F6","chromosome":"TGVEG_chrVIII","start_pos":6863205}]}