{"gene":"TAF8","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2000,"finding":"The mouse Tbn gene (ortholog of human TAF8) is essential for survival of inner cell mass (ICM) cells in early embryos. Tbn mutant embryos develop to blastocyst stage but ICM cells undergo apoptosis (caspase-3-dependent, TUNEL-positive) by E4.0 while trophoblast cells remain viable, demonstrating a selective requirement for TBN in pluripotent cell survival.","method":"Gene knockout (homologous recombination), TUNEL assay, caspase-3 immunostaining, in vitro ICM culture","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with specific cellular phenotype (ICM apoptosis), replicated by multiple orthogonal methods (TUNEL, caspase-3, in vitro culture), foundational characterization paper","pmids":["11076765"],"is_preprint":false},{"year":2003,"finding":"Human TAF8 (TAF(II)43) is an integral subunit of functional TFIID and is the ortholog of mouse TBN. TAF8 is dramatically induced and sequestered within TFIID upon differentiation of 3T3-L1 preadipocytes to adipocytes, while other TAF levels slightly decrease. Ectopic expression of the TAF8 histone fold domain (HFD) acts as a dominant-negative and selectively inhibits adipogenic differentiation, whereas full-length TAF8 acts as a positive regulator of adipogenesis and rescues HFD-mediated inhibition.","method":"Western blot (induction during adipogenesis), dominant-negative overexpression of HFD, 3T3-L1 differentiation assay, co-immunoprecipitation (TFIID complex membership)","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (Co-IP for complex membership, dominant-negative mutagenesis, rescue experiment, differentiation assay), single lab but rigorous with multiple approaches","pmids":["14580349"],"is_preprint":false},{"year":2001,"finding":"hTAF(II)135 interacts weakly with hTAF(II)43 (TAF8) as detected by far Western blot, placing TAF8 within the network of TFIID subunit interactions involved in TFIID assembly and transcriptional regulation.","method":"Far Western blot (protein-protein interaction)","journal":"Molecular and cellular biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single far-Western method showing weak interaction, no reciprocal confirmation, TAF8 is a minor finding in a paper focused on TAF(II)135","pmids":["11564872"],"is_preprint":false},{"year":1998,"finding":"The human TAF(II)43 gene maps to chromosome 6p21, is present as a single copy in the genome, and its transcript is expressed ubiquitously at low levels similar to TBP, consistent with a constitutive role as a TFIID subunit.","method":"Genomic mapping (FISH/somatic cell hybrids), Northern blot","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct genomic and expression characterization by two orthogonal methods, single lab","pmids":["9569032"],"is_preprint":false},{"year":2008,"finding":"TBN (TAF8) mRNA expression in human preimplantation embryos is regulated by growth factors: when embryos are cultured with LIF, only 2 out of 9 blastocysts expressed TBN, indicating that LIF suppresses TAF8 expression in human blastocysts.","method":"RT-PCR of single human embryos cultured with defined growth factors","journal":"Reproduction (Cambridge, England)","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single method (RT-PCR), small sample size (n=9), no mechanistic follow-up of how LIF suppresses TAF8","pmids":["18411410"],"is_preprint":false}],"current_model":"TAF8 (TAF(II)43/TBN) is an integral, inducible subunit of the TFIID transcription factor complex whose histone fold domain mediates interactions with other TAF subunits; it is selectively upregulated and incorporated into TFIID during adipogenic differentiation of 3T3-L1 cells, where it acts as a positive regulator of adipogenesis, and it is required for the survival of pluripotent inner cell mass cells in early mouse embryos via suppression of apoptosis."},"narrative":{"mechanistic_narrative":"TAF8 (TAF(II)43/TBN) is an integral subunit of the general transcription factor TFIID that contributes to RNA polymerase II transcriptional regulation during cellular differentiation and pluripotent cell survival [PMID:11076765, PMID:14580349]. Its histone fold domain mediates incorporation into TFIID, and an isolated HFD acts as a dominant-negative that disrupts TFIID-dependent transcription [PMID:14580349]. During adipogenic differentiation of 3T3-L1 preadipocytes, TAF8 is dramatically induced and sequestered into TFIID while other TAF levels decline, and full-length TAF8 functions as a positive regulator of adipogenesis, rescuing HFD-mediated inhibition [PMID:14580349]. In early mouse embryos, TAF8 is selectively required for survival of pluripotent inner cell mass cells: loss of TAF8 permits blastocyst formation but triggers caspase-3-dependent apoptosis of the ICM while trophoblast cells remain viable [PMID:11076765]. The TAF8 gene is single-copy and ubiquitously expressed at low levels comparable to TBP, consistent with a constitutive TFIID role [PMID:9569032]. Beyond its membership in TFIID and these differentiation/survival phenotypes, the precise molecular contacts and target genes of TAF8 are not detailed in the available corpus.","teleology":[{"year":1998,"claim":"Established the genomic and expression baseline for human TAF(II)43, framing it as a constitutive component of the transcription machinery.","evidence":"FISH/somatic cell hybrid mapping and Northern blot of the human TAF(II)43 gene","pmids":["9569032"],"confidence":"Medium","gaps":["Does not establish protein function or complex membership","No evidence of regulated expression in specific cell types"]},{"year":2000,"claim":"Resolved whether TAF8 has a selective biological requirement, showing it is essential specifically for survival of pluripotent inner cell mass cells rather than for all cell types.","evidence":"Mouse Tbn gene knockout with TUNEL, caspase-3 immunostaining, and in vitro ICM culture","pmids":["11076765"],"confidence":"High","gaps":["Molecular basis of ICM-selective apoptosis not defined","Target genes whose dysregulation drives apoptosis unknown","Does not connect the survival role to TFIID composition"]},{"year":2001,"claim":"Began placing TAF8 within the TFIID subunit interaction network by detecting a contact with TAF(II)135.","evidence":"Far Western blot detecting weak hTAF(II)135–hTAF(II)43 interaction","pmids":["11564872"],"confidence":"Low","gaps":["Single far-Western method without reciprocal confirmation","Interaction reported as weak with unclear functional significance","No structural mapping of the contact"]},{"year":2003,"claim":"Demonstrated that TAF8 is an inducible, regulatory TFIID subunit acting through its histone fold domain to drive a specific differentiation program (adipogenesis).","evidence":"Western blot of induction during 3T3-L1 adipogenesis, Co-IP for TFIID membership, dominant-negative HFD overexpression, and rescue experiments","pmids":["14580349"],"confidence":"High","gaps":["Direct transcriptional targets during adipogenesis not identified","Mechanism of selective TAF8 induction not resolved","HFD interaction partners within TFIID not mapped structurally"]},{"year":2008,"claim":"Linked TAF8 expression to extrinsic growth factor signaling in human preimplantation embryos, indicating regulated rather than purely constitutive expression in this context.","evidence":"RT-PCR of single human embryos cultured with LIF and defined growth factors","pmids":["18411410"],"confidence":"Low","gaps":["Small sample size (n=9)","Mechanism of LIF-mediated suppression unknown","No functional consequence of expression change demonstrated"]},{"year":null,"claim":"How TAF8 incorporation into TFIID directs cell-type-specific transcriptional programs and selectively protects pluripotent cells from apoptosis remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No direct TAF8 target genes identified in any system","Mechanistic link between TFIID composition and ICM survival missing","Structural basis of TAF8 contacts within TFIID undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[1,3]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,1]}],"complexes":["TFIID"],"partners":["TAF4B"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q7Z7C8","full_name":"Transcription initiation factor TFIID subunit 8","aliases":["Protein taube nuss","TBP-associated factor 43 kDa","TBP-associated factor 8","Transcription initiation factor TFIID 43 kDa subunit","TAFII-43","TAFII43","hTAFII43"],"length_aa":310,"mass_kda":34.3,"function":"The TFIID basal transcription factor complex plays a major role in the initiation of RNA polymerase II (Pol II)-dependent transcription (PubMed:33795473). TFIID recognizes and binds promoters with or without a TATA box via its subunit TBP, a TATA-box-binding protein, and promotes assembly of the pre-initiation complex (PIC) (PubMed:33795473). The TFIID complex consists of TBP and TBP-associated factors (TAFs), including TAF1, TAF2, TAF3, TAF4, TAF5, TAF6, TAF7, TAF8, TAF9, TAF10, TAF11, TAF12 and TAF13 (PubMed:33795473). The TFIID complex structure can be divided into 3 modules TFIID-A, TFIID-B, and TFIID-C (PubMed:33795473). TAF8 is involved in forming the TFIID-B module, together with TAF5 (PubMed:33795473). Mediates both basal and activator-dependent transcription (PubMed:14580349). Plays a role in the differentiation of preadipocyte fibroblasts to adipocytes, however, does not seem to play a role in differentiation of myoblasts (PubMed:14580349). Required for the integration of TAF10 in the TAF complex (PubMed:14580349). May be important for survival of cells of the inner cell mass which constitute the pluripotent cell population of the early embryo (By similarity)","subcellular_location":"Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q7Z7C8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/TAF8","classification":"Common Essential","n_dependent_lines":1129,"n_total_lines":1208,"dependency_fraction":0.9346026490066225},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TAF8","total_profiled":1310},"omim":[{"mim_id":"619972","title":"NEURODEVELOPMENTAL DISORDER WITH SEVERE MOTOR IMPAIRMENT, ABSENT LANGUAGE, CEREBRAL HYPOMYELINATION, AND BRAIN ATROPHY; NEDMLHB","url":"https://www.omim.org/entry/619972"},{"mim_id":"612762","title":"SPTY7-LIKE, STAGA COMPLEX SUBUNIT GAMMA; SUPT7L","url":"https://www.omim.org/entry/612762"},{"mim_id":"609514","title":"TATA BOX-BINDING PROTEIN-ASSOCIATED FACTOR 8; TAF8","url":"https://www.omim.org/entry/609514"},{"mim_id":"602955","title":"TAF6 RNA POLYMERASE II, TATA BOX-BINDING PROTEIN-ASSOCIATED FACTOR, 80-KD; TAF6","url":"https://www.omim.org/entry/602955"},{"mim_id":"601796","title":"TAF4 RNA POLYMERASE II, TATA BOX-BINDING PROTEIN-ASSOCIATED FACTOR, 135-KD; TAF4","url":"https://www.omim.org/entry/601796"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Mid piece","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TAF8"},"hgnc":{"alias_symbol":["FLJ32821","TAF(II)43"],"prev_symbol":["TBN"]},"alphafold":{"accession":"Q7Z7C8","domains":[{"cath_id":"1.10.20.10","chopping":"24-111","consensus_level":"high","plddt":93.0693,"start":24,"end":111},{"cath_id":"-","chopping":"171-235","consensus_level":"high","plddt":86.9471,"start":171,"end":235}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z7C8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z7C8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z7C8-F1-predicted_aligned_error_v6.png","plddt_mean":73.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TAF8","jax_strain_url":"https://www.jax.org/strain/search?query=TAF8"},"sequence":{"accession":"Q7Z7C8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q7Z7C8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q7Z7C8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z7C8"}},"corpus_meta":[{"pmid":"20961960","id":"PMC_20961960","title":"A 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A vasodilator and angiotensin converting enzyme inhibitor.","date":"2011","source":"Organic & biomolecular chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21860877","citation_count":1,"is_preprint":false},{"pmid":"39653079","id":"PMC_39653079","title":"Synthesis and Preclinical Evaluation of a Novel Oxy133-Infused Biomimetic Bone Graft Using a Rat Model of Posterolateral Spinal Fusion.","date":"2025","source":"World neurosurgery","url":"https://pubmed.ncbi.nlm.nih.gov/39653079","citation_count":1,"is_preprint":false},{"pmid":"41761981","id":"PMC_41761981","title":"METTL16 Modulates GPX4 Expression to Regulate Chondrocyte Ferroptosis.","date":"2026","source":"Frontiers in bioscience (Landmark edition)","url":"https://pubmed.ncbi.nlm.nih.gov/41761981","citation_count":0,"is_preprint":false},{"pmid":"41058170","id":"PMC_41058170","title":"Photoelectrochemical Catalyzed Site-Selective Tryptophan β-Position Functionalization.","date":"2025","source":"Journal of the American Chemical Society","url":"https://pubmed.ncbi.nlm.nih.gov/41058170","citation_count":0,"is_preprint":false},{"pmid":"40286200","id":"PMC_40286200","title":"Pharmacochemical Studies of Synthesized Coumarin-Isoxazole-Pyridine Hybrids.","date":"2025","source":"Molecules (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/40286200","citation_count":0,"is_preprint":false},{"pmid":"41345047","id":"PMC_41345047","title":"Tetramethylpyrazine nitrone: a multifaceted neuroprotective agent in neurodegenerative disorders.","date":"2025","source":"Neurodegenerative disease management","url":"https://pubmed.ncbi.nlm.nih.gov/41345047","citation_count":0,"is_preprint":false},{"pmid":"39684296","id":"PMC_39684296","title":"Paraburkholderia tropica Primes a Multilayered Transcriptional Defense Response to the Nematode Meloidogyne spp. in Tomato.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39684296","citation_count":0,"is_preprint":false},{"pmid":"41981466","id":"PMC_41981466","title":"QTL mapping, validation, and candidate gene predicting for maize plant architecture traits via bulked segregant analysis plus linkage analysis with F₂ population.","date":"2026","source":"BMC plant biology","url":"https://pubmed.ncbi.nlm.nih.gov/41981466","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.01.16.633312","title":"Epigenetic Modulation of Host Immunity related genes in Pulmonary Tuberculosis: A Comprehensive Analysis of DNA Methylation Profiles in Peripheral Blood Mononuclear Cells","date":"2025-01-18","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.16.633312","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.09.13.612990","title":"Molecular computation at equilibrium via programmable entropy","date":"2024-09-19","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.13.612990","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":54956,"output_tokens":1544,"usd":0.094014,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7936,"output_tokens":1938,"usd":0.044065,"stage2_stop_reason":"end_turn"},"total_usd":0.138079,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the abstracts, I need to identify papers that describe mechanistic findings about the canonical TAF8 protein (also known as TAF(II)43, TBN in the context of TFIID, FLJ32821).\n\nKey papers to focus on:\n- Paper [14]: Describes mouse Tbn/TBN protein, essential for inner cell mass survival - this is the founding characterization\n- Paper [29]: Human TAF(II)43 (TAF8) as integral TFIID component, role in adipogenesis - directly about the canonical protein\n- Paper [16]: hTAF(II)43 interaction studies within TFIID\n- Paper [43]: Genomic characterization of TAF(II)43\n- Paper [13]: TBN expression in human embryos\n\nMost other papers use \"TBN\" as abbreviations for unrelated things (tetramethylpyrazine nitrone, total body nitrogen, tassel branch number, etc.) and must be excluded.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"The mouse Tbn gene (ortholog of human TAF8) is essential for survival of inner cell mass (ICM) cells in early embryos. Tbn mutant embryos develop to blastocyst stage but ICM cells undergo apoptosis (caspase-3-dependent, TUNEL-positive) by E4.0 while trophoblast cells remain viable, demonstrating a selective requirement for TBN in pluripotent cell survival.\",\n      \"method\": \"Gene knockout (homologous recombination), TUNEL assay, caspase-3 immunostaining, in vitro ICM culture\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with specific cellular phenotype (ICM apoptosis), replicated by multiple orthogonal methods (TUNEL, caspase-3, in vitro culture), foundational characterization paper\",\n      \"pmids\": [\"11076765\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Human TAF8 (TAF(II)43) is an integral subunit of functional TFIID and is the ortholog of mouse TBN. TAF8 is dramatically induced and sequestered within TFIID upon differentiation of 3T3-L1 preadipocytes to adipocytes, while other TAF levels slightly decrease. Ectopic expression of the TAF8 histone fold domain (HFD) acts as a dominant-negative and selectively inhibits adipogenic differentiation, whereas full-length TAF8 acts as a positive regulator of adipogenesis and rescues HFD-mediated inhibition.\",\n      \"method\": \"Western blot (induction during adipogenesis), dominant-negative overexpression of HFD, 3T3-L1 differentiation assay, co-immunoprecipitation (TFIID complex membership)\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (Co-IP for complex membership, dominant-negative mutagenesis, rescue experiment, differentiation assay), single lab but rigorous with multiple approaches\",\n      \"pmids\": [\"14580349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"hTAF(II)135 interacts weakly with hTAF(II)43 (TAF8) as detected by far Western blot, placing TAF8 within the network of TFIID subunit interactions involved in TFIID assembly and transcriptional regulation.\",\n      \"method\": \"Far Western blot (protein-protein interaction)\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single far-Western method showing weak interaction, no reciprocal confirmation, TAF8 is a minor finding in a paper focused on TAF(II)135\",\n      \"pmids\": [\"11564872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The human TAF(II)43 gene maps to chromosome 6p21, is present as a single copy in the genome, and its transcript is expressed ubiquitously at low levels similar to TBP, consistent with a constitutive role as a TFIID subunit.\",\n      \"method\": \"Genomic mapping (FISH/somatic cell hybrids), Northern blot\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct genomic and expression characterization by two orthogonal methods, single lab\",\n      \"pmids\": [\"9569032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TBN (TAF8) mRNA expression in human preimplantation embryos is regulated by growth factors: when embryos are cultured with LIF, only 2 out of 9 blastocysts expressed TBN, indicating that LIF suppresses TAF8 expression in human blastocysts.\",\n      \"method\": \"RT-PCR of single human embryos cultured with defined growth factors\",\n      \"journal\": \"Reproduction (Cambridge, England)\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single method (RT-PCR), small sample size (n=9), no mechanistic follow-up of how LIF suppresses TAF8\",\n      \"pmids\": [\"18411410\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TAF8 (TAF(II)43/TBN) is an integral, inducible subunit of the TFIID transcription factor complex whose histone fold domain mediates interactions with other TAF subunits; it is selectively upregulated and incorporated into TFIID during adipogenic differentiation of 3T3-L1 cells, where it acts as a positive regulator of adipogenesis, and it is required for the survival of pluripotent inner cell mass cells in early mouse embryos via suppression of apoptosis.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TAF8 (TAF(II)43/TBN) is an integral subunit of the general transcription factor TFIID that contributes to RNA polymerase II transcriptional regulation during cellular differentiation and pluripotent cell survival [#0, #1]. Its histone fold domain mediates incorporation into TFIID, and an isolated HFD acts as a dominant-negative that disrupts TFIID-dependent transcription [#1]. During adipogenic differentiation of 3T3-L1 preadipocytes, TAF8 is dramatically induced and sequestered into TFIID while other TAF levels decline, and full-length TAF8 functions as a positive regulator of adipogenesis, rescuing HFD-mediated inhibition [#1]. In early mouse embryos, TAF8 is selectively required for survival of pluripotent inner cell mass cells: loss of TAF8 permits blastocyst formation but triggers caspase-3-dependent apoptosis of the ICM while trophoblast cells remain viable [#0]. The TAF8 gene is single-copy and ubiquitously expressed at low levels comparable to TBP, consistent with a constitutive TFIID role [#3]. Beyond its membership in TFIID and these differentiation/survival phenotypes, the precise molecular contacts and target genes of TAF8 are not detailed in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established the genomic and expression baseline for human TAF(II)43, framing it as a constitutive component of the transcription machinery.\",\n      \"evidence\": \"FISH/somatic cell hybrid mapping and Northern blot of the human TAF(II)43 gene\",\n      \"pmids\": [\"9569032\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish protein function or complex membership\", \"No evidence of regulated expression in specific cell types\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Resolved whether TAF8 has a selective biological requirement, showing it is essential specifically for survival of pluripotent inner cell mass cells rather than for all cell types.\",\n      \"evidence\": \"Mouse Tbn gene knockout with TUNEL, caspase-3 immunostaining, and in vitro ICM culture\",\n      \"pmids\": [\"11076765\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of ICM-selective apoptosis not defined\", \"Target genes whose dysregulation drives apoptosis unknown\", \"Does not connect the survival role to TFIID composition\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Began placing TAF8 within the TFIID subunit interaction network by detecting a contact with TAF(II)135.\",\n      \"evidence\": \"Far Western blot detecting weak hTAF(II)135–hTAF(II)43 interaction\",\n      \"pmids\": [\"11564872\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single far-Western method without reciprocal confirmation\", \"Interaction reported as weak with unclear functional significance\", \"No structural mapping of the contact\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrated that TAF8 is an inducible, regulatory TFIID subunit acting through its histone fold domain to drive a specific differentiation program (adipogenesis).\",\n      \"evidence\": \"Western blot of induction during 3T3-L1 adipogenesis, Co-IP for TFIID membership, dominant-negative HFD overexpression, and rescue experiments\",\n      \"pmids\": [\"14580349\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct transcriptional targets during adipogenesis not identified\", \"Mechanism of selective TAF8 induction not resolved\", \"HFD interaction partners within TFIID not mapped structurally\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linked TAF8 expression to extrinsic growth factor signaling in human preimplantation embryos, indicating regulated rather than purely constitutive expression in this context.\",\n      \"evidence\": \"RT-PCR of single human embryos cultured with LIF and defined growth factors\",\n      \"pmids\": [\"18411410\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Small sample size (n=9)\", \"Mechanism of LIF-mediated suppression unknown\", \"No functional consequence of expression change demonstrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TAF8 incorporation into TFIID directs cell-type-specific transcriptional programs and selectively protects pluripotent cells from apoptosis remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No direct TAF8 target genes identified in any system\", \"Mechanistic link between TFIID composition and ICM survival missing\", \"Structural basis of TAF8 contacts within TFIID undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"complexes\": [\"TFIID\"],\n    \"partners\": [\"TAF4B\"],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}