{"gene":"TXLNG","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2005,"finding":"FIAT (TXLNG) is a leucine zipper nuclear protein that interacts with ATF4 to form inactive dimers, preventing ATF4 from binding to DNA and blocking ATF4-mediated transcription of the osteocalcin gene in vitro. Transgenic overexpression in osteoblasts reduced osteocalcin expression, decreased bone mineral density, and reduced mineral apposition rate, demonstrating cell-autonomous decrease in osteoblast activity.","method":"In vitro transcription assay, transgenic mouse overexpression, primary osteoblast cultures (alkaline phosphatase activity, mineralization), immunodetection","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional assays in vitro and in vivo, multiple orthogonal methods (DNA-binding inhibition, reporter assays, transgenic mice, primary cultures), replicated across multiple labs","pmids":["15911876"],"is_preprint":false},{"year":2006,"finding":"FIAT/gamma-taxilin localizes to the nucleus in osteoblasts and dimerizes with ATF4 through its leucine zipper to form inactive dimers (lacking DNA-binding basic domain), thereby inhibiting ATF4-mediated transcription. FIAT also interacts with the transcriptional co-activator alphaNAC, suggesting an additional mechanism contributing to inhibition of ATF4-dependent osteocalcin gene transcription.","method":"Subcellular localization by immunofluorescence, co-immunoprecipitation, luciferase reporter assay","journal":"Annals of the New York Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, multiple assays but abstract-level detail; largely replicates/extends prior work with addition of alphaNAC interaction","pmids":["16831913"],"is_preprint":false},{"year":2007,"finding":"FIAT interacts with Fra-1 (but not c-Jun) and specifically inhibits transcriptional activation by a c-Jun/Fra-1 heterodimer, without affecting c-Jun homodimer-mediated transcription. This identifies Fra-1 as a second transcriptional target of FIAT repressor activity.","method":"Transient transfection with AP-1-tk-luciferase reporter in MC3T3-E1 osteoblastic cells","journal":"Annals of the New York Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single lab, reporter assays in osteoblastic cells, replicated in a subsequent paper (PMID:20392257)","pmids":["18083929"],"is_preprint":false},{"year":2008,"finding":"FIAT interacts with ATF4 through its second leucine zipper (LZ2, amino acids 194–222). Deletion or leucine-to-alanine mutation of LZ2 (L208A/L215A/L222A) abolished FIAT-ATF4 interaction and inhibition of ATF4-mediated transcription, as well as FIAT-mediated inhibition of mineralization. Mutations in LZ1 or LZ3 did not affect these activities.","method":"Deletion mutagenesis, site-specific mutagenesis, luciferase reporter assay in MC3T3-E1 cells, mineralization assay in stably transfected osteoblastic cells","journal":"Journal of cellular biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis of active site (LZ2) with functional readouts (reporter assay + mineralization), single lab but multiple orthogonal methods and rigorous controls","pmids":["18680144"],"is_preprint":false},{"year":2009,"finding":"siRNA knockdown of FIAT in osteoblastic cells increased ATF4 occupancy on the osteocalcin promoter, enhanced osteocalcin reporter and endogenous gene expression, increased bone sialoprotein and type I collagen protein synthesis, and enhanced mineralization, confirming that FIAT negatively regulates ATF4 activity and osteoblast function.","method":"siRNA knockdown, chromatin immunoprecipitation (ChIP), luciferase reporter assay, immunoblotting, mineralization assay in MC3T3-E1 cells and primary osteoblasts","journal":"Journal of cellular biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — loss-of-function with multiple orthogonal readouts (ChIP, reporter, endogenous gene expression, mineralization), single lab","pmids":["19016261"],"is_preprint":false},{"year":2009,"finding":"FIAT protein levels are inversely correlated with ATF4 protein levels during osteoblastogenesis. Decreased FIAT protein in mature osteoblasts coincides with increased ATF4 binding to the osteocalcin promoter and increased osteocalcin expression. In adult bone, FIAT is expressed in osteocytes while ATF4 is in active osteoblasts and lining cells but not osteocytes.","method":"Immunofluorescence, immunoblotting, RT-qPCR, chromatin immunoprecipitation (ChIP), immunohistochemistry of mouse long bones","journal":"Gene expression patterns : GEP","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization and expression quantification with functional correlate (ATF4 promoter occupancy), single lab","pmids":["19232401"],"is_preprint":false},{"year":2010,"finding":"FIAT represses transcriptional activation by a FRA-1/c-JUN heterodimer (but not c-JUN homodimer) through its second leucine zipper. Natural FRA-1 target genes Mmp-9 and Mgp were used as reporters. This confirms FRA-1 as a second transcriptional target of FIAT.","method":"Luciferase reporter assays with natural FRA-1 target promoters (Mmp-9, Mgp), mutagenesis of FIAT LZ2, transient transfection in MC3T3-E1 cells","journal":"Annals of the New York Academy of Sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis mapped to LZ2, multiple reporter genes used, single lab","pmids":["20392257"],"is_preprint":false},{"year":2013,"finding":"Sp1 and Sp3 (but not Sp7/OSTERIX) bind a canonical GC-box in the proximal Fiat promoter. Sp1 dose-dependently activates Fiat expression while both Sp3 isoforms dose-dependently repress it; Sp1 knockdown reduces and Sp3 knockdown increases endogenous FIAT expression, establishing Sp1/Sp3 interplay as a regulatory mechanism controlling Fiat gene expression in osteoblasts.","method":"EMSA, chromatin immunoprecipitation (ChIP), transient transfection luciferase reporter, siRNA knockdown, pharmacological inhibition (WP631)","journal":"Journal of cellular biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (EMSA, ChIP, reporter assay, RNAi, pharmacological), single lab but comprehensive mechanistic dissection","pmids":["23463631"],"is_preprint":false},{"year":2014,"finding":"SUMOylated αNAC (at K127, enhanced by phosphomimetic S132D mutation) specifically interacts with HDAC2 and potentiates FIAT-mediated transcriptional repression of the osteocalcin gene. This effect requires binding of SUMOylated αNAC to the target promoter, establishing a mechanism whereby maximal FIAT repression requires interaction with SUMOylated, HDAC2-associated αNAC.","method":"In vitro SUMOylation assay, mutagenesis (K127 and S132D), co-immunoprecipitation, luciferase reporter assay, ChIP in osteoblasts and calvarial tissue","journal":"Journal of cellular biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of SUMOylation, site-specific mutagenesis, ChIP, and reporter assay; multiple orthogonal methods in single lab","pmids":["24375853"],"is_preprint":false},{"year":2014,"finding":"Genetic interaction between FIAT and αNAC is demonstrated in vivo: compound Naca(+/-); Fiat(+/-) heterozygous mice show increased cortical porosity and elevated Dmp1 expression compared to single heterozygotes, confirming FIAT and αNAC act in a common genetic pathway controlling bone physiology.","method":"Compound heterozygous mouse model, microcomputed tomography (μCT), RT-qPCR","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis in compound heterozygotes with defined phenotypic readout, single lab","pmids":["24440290"],"is_preprint":false},{"year":2017,"finding":"FIAT knockout (Fiat-/Y) mice show increased trabecular and cortical bone mass with increased mineral apposition rate and osteoblast function, confirming FIAT is a negative regulator of osteoblast activity in vivo. Loss of FIAT also increased susceptibility to fat accumulation and metabolic disturbance (reduced fatty acid oxidation and lipolysis, upregulated Scd1) on high-fat diet.","method":"Fiat knockout mice, microcomputed tomography, histomorphometry, biomechanical testing, gene expression analysis, metabolic phenotyping","journal":"Endocrinology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic loss-of-function (knockout) with multiple orthogonal readouts (μCT, histomorphometry, biomechanics, metabolic measures), single lab","pmids":["27906582"],"is_preprint":false},{"year":2018,"finding":"FIAT (TXLNG) is a direct target of miR-98; miR-98 overexpression reduces FIAT protein and promotes osteoblast mineralization. Sp7 promotes miR-98 transcription by binding the miR-98 promoter region, creating a miR-98/FIAT/Sp7 regulatory loop in osteoblast mineralization.","method":"Luciferase reporter assay (miR-98 target validation), EMSA, ChIP, promoter luciferase assay, overexpression and knockdown experiments","journal":"European review for medical and pharmacological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — multiple assays but single lab, limited mechanistic detail in abstract","pmids":["29949140"],"is_preprint":false},{"year":2023,"finding":"TXLNG overexpression in adipocytes reverses high-glucose/high-insulin-induced insulin resistance by restoring glucose uptake, GLUT4 surface levels, and Akt phosphorylation, and reducing IL-6 and TNF-α expression. This effect is mediated through inhibition of ATF4 transcriptional activity; ATF4 overexpression abolishes the improvements in insulin-resistant adipocyte dysfunction caused by TXLNG overexpression. TXLNG overexpression in HFD mice reduced body weight, adipose weight, adipocyte size, and pro-inflammatory markers.","method":"TXLNG overexpression and knockdown in 3T3-L1 adipocytes, HFD mouse model, glucose uptake assay, immunoblotting (GLUT4, Akt phosphorylation), RT-qPCR","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss- and gain-of-function with defined molecular readouts and epistasis (ATF4 rescue), single lab","pmids":["37028586"],"is_preprint":false}],"current_model":"TXLNG (FIAT/gamma-taxilin) is a nuclear leucine zipper protein lacking a DNA-binding domain that acts as a transcriptional repressor by heterodimerizing with bZIP transcription factors (primarily ATF4, and also Fra-1) through its second leucine zipper, preventing them from binding DNA; maximal repression is potentiated by interaction with SUMOylated αNAC/HDAC2; its expression in osteoblasts is regulated by Sp1/Sp3 and by miR-98, its activity controls osteoblast function and bone mass accrual in vivo, and it also modulates insulin resistance through ATF4 inhibition in adipose tissue."},"narrative":{"mechanistic_narrative":"TXLNG (FIAT/gamma-taxilin) is a nuclear leucine zipper protein that functions as a transcriptional repressor controlling osteoblast activity and bone mass accrual [PMID:15911876, PMID:27906582]. Lacking a basic DNA-binding domain, FIAT heterodimerizes with the bZIP transcription factor ATF4 through its second leucine zipper (LZ2, residues 194–222), forming transcriptionally inactive dimers that cannot bind DNA and thereby blocking ATF4-mediated transcription of the osteocalcin gene; mutation of LZ2 abolishes both the ATF4 interaction and repression of mineralization [PMID:15911876, PMID:18680144]. Loss-of-function studies confirm this repressor role: FIAT knockdown increases ATF4 occupancy on the osteocalcin promoter and enhances osteoblast differentiation [PMID:19016261], and Fiat-knockout mice display increased bone mass alongside increased susceptibility to fat accumulation and metabolic disturbance [PMID:27906582]. FIAT also represses FRA-1/c-JUN heterodimer-driven transcription through LZ2, extending its repressor activity to a second bZIP target [PMID:20392257]. Maximal repression of osteocalcin requires interaction with SUMOylated αNAC associated with HDAC2 at the target promoter [PMID:24375853], and Fiat expression itself is controlled by opposing Sp1/Sp3 inputs at a proximal GC-box and by miR-98 [PMID:23463631, PMID:29949140]. Beyond bone, TXLNG improves insulin sensitivity in adipocytes by inhibiting ATF4 transcriptional activity, linking the same repressor mechanism to metabolic regulation [PMID:37028586].","teleology":[{"year":2005,"claim":"Established that FIAT acts as a dominant-negative repressor of ATF4 by forming inactive dimers, defining a molecular brake on osteoblast activity in vivo.","evidence":"In vitro transcription/reporter assays plus transgenic osteoblast-targeted overexpression with bone densitometry and mineralization readouts","pmids":["15911876"],"confidence":"High","gaps":["Did not map the interaction interface","Did not test endogenous loss-of-function"]},{"year":2006,"claim":"Confirmed nuclear localization and leucine-zipper-mediated ATF4 dimerization and identified αNAC as an additional FIAT partner contributing to repression.","evidence":"Immunofluorescence, co-immunoprecipitation, and luciferase reporter assays in osteoblasts","pmids":["16831913"],"confidence":"Medium","gaps":["αNAC interaction mechanism not resolved","abstract-level detail only"]},{"year":2007,"claim":"Extended FIAT's repressor specificity beyond ATF4 to the AP-1 family by showing it inhibits c-Jun/Fra-1 heterodimers but not c-Jun homodimers.","evidence":"AP-1-tk-luciferase reporter assays in MC3T3-E1 osteoblastic cells","pmids":["18083929"],"confidence":"Medium","gaps":["Did not map binding region for Fra-1","single reporter system"]},{"year":2008,"claim":"Mapped the ATF4-binding and repressor activity to the second leucine zipper (LZ2), defining the functional interaction module.","evidence":"Deletion and L-to-A site-specific mutagenesis with reporter and mineralization assays in osteoblastic cells","pmids":["18680144"],"confidence":"High","gaps":["No structural model of the heterodimer interface","LZ1/LZ3 functions undefined"]},{"year":2009,"claim":"Demonstrated by loss-of-function that endogenous FIAT restrains ATF4 promoter occupancy and osteoblast differentiation, validating it as a negative regulator.","evidence":"siRNA knockdown with ChIP, reporter, endogenous gene expression, and mineralization assays","pmids":["19016261"],"confidence":"High","gaps":["In vivo knockdown not addressed","effect on Fra-1 targets endogenously untested"]},{"year":2009,"claim":"Showed reciprocal FIAT/ATF4 protein dynamics and cell-type partitioning across osteoblastogenesis, linking FIAT downregulation to osteoblast maturation.","evidence":"Immunofluorescence, immunoblotting, RT-qPCR, ChIP, and immunohistochemistry of mouse long bones","pmids":["19232401"],"confidence":"Medium","gaps":["Mechanism driving FIAT downregulation not yet defined","correlative in adult bone"]},{"year":2010,"claim":"Confirmed FIAT represses FRA-1/c-JUN heterodimer activity via LZ2 using natural target promoters, generalizing its bZIP repressor mechanism.","evidence":"Luciferase reporters on natural FRA-1 targets (Mmp-9, Mgp) with LZ2 mutagenesis in MC3T3-E1 cells","pmids":["20392257"],"confidence":"Medium","gaps":["Physiological role of Fra-1 repression in bone not established"]},{"year":2013,"claim":"Defined upstream transcriptional control of Fiat by antagonistic Sp1 (activating) and Sp3 (repressing) binding at a proximal GC-box.","evidence":"EMSA, ChIP, reporter assays, siRNA knockdown, and pharmacological inhibition in osteoblasts","pmids":["23463631"],"confidence":"High","gaps":["Signals controlling Sp1/Sp3 balance unknown"]},{"year":2014,"claim":"Established that maximal FIAT repression requires SUMOylated, HDAC2-associated αNAC bound at the target promoter, adding a co-repressor layer to the mechanism.","evidence":"In vitro SUMOylation, site-specific mutagenesis (K127, S132D), co-IP, ChIP, and reporter assays in osteoblasts/calvaria","pmids":["24375853"],"confidence":"High","gaps":["How SUMOylation is regulated in vivo not addressed"]},{"year":2014,"claim":"Demonstrated in vivo genetic epistasis between Fiat and Naca, placing them in a common pathway controlling bone physiology.","evidence":"Compound heterozygous mice analyzed by microCT and RT-qPCR","pmids":["24440290"],"confidence":"Medium","gaps":["Cell-type and molecular basis of cortical porosity phenotype unresolved"]},{"year":2017,"claim":"Genetic deletion confirmed FIAT as a negative regulator of bone mass in vivo and revealed an unexpected metabolic role in fat accumulation and lipid handling.","evidence":"Fiat-knockout mice with microCT, histomorphometry, biomechanics, and metabolic phenotyping on high-fat diet","pmids":["27906582"],"confidence":"High","gaps":["Tissue source of metabolic phenotype not dissected","molecular link to Scd1 not mapped"]},{"year":2018,"claim":"Identified post-transcriptional control of FIAT by miR-98 within an Sp7-driven regulatory loop modulating osteoblast mineralization.","evidence":"miR-98 target reporter validation, EMSA, ChIP, promoter reporters, and overexpression/knockdown","pmids":["29949140"],"confidence":"Medium","gaps":["Loop dynamics in vivo untested","abstract-level mechanistic detail"]},{"year":2023,"claim":"Extended the ATF4-repressor mechanism to adipocytes, showing TXLNG improves insulin sensitivity by inhibiting ATF4 transcriptional activity.","evidence":"Gain/loss-of-function in 3T3-L1 adipocytes and HFD mice with glucose uptake, GLUT4/Akt readouts, and ATF4 epistasis rescue","pmids":["37028586"],"confidence":"Medium","gaps":["Direct ATF4 targets in adipocytes not mapped","single lab"]},{"year":null,"claim":"It remains unknown what signals dynamically control FIAT abundance and bZIP partner choice across tissues, and whether its repressor function operates in non-bone, non-adipose contexts.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of FIAT-bZIP heterodimers","Tissue-specific partner spectrum undefined","Human disease relevance not established in the corpus"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,3,4,6]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,3]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,5]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,4,6]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,10]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[10,12]}],"complexes":[],"partners":["ATF4","FOSL1","JUN","NACA","HDAC2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NUQ3","full_name":"Gamma-taxilin","aliases":["Environmental lipopolysaccharide-responding gene protein","Factor inhibiting ATF4-mediated transcription","FIAT","Lipopolysaccharide-specific response protein 5"],"length_aa":528,"mass_kda":60.6,"function":"May be involved in intracellular vesicle traffic. Inhibits ATF4-mediated transcription, possibly by dimerizing with ATF4 to form inactive dimers that cannot bind DNA. May be involved in regulating bone mass density through an ATF4-dependent pathway. May be involved in cell cycle progression","subcellular_location":"Nucleus membrane; Cytoplasm, cytosol","url":"https://www.uniprot.org/uniprotkb/Q9NUQ3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TXLNG","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TXLNG","total_profiled":1310},"omim":[{"mim_id":"400031","title":"TAXILIN, GAMMA, Y-LINKED, PSEUDOGENE; TXLNGY","url":"https://www.omim.org/entry/400031"},{"mim_id":"300677","title":"TAXILIN, GAMMA; TXLNG","url":"https://www.omim.org/entry/300677"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TXLNG"},"hgnc":{"alias_symbol":["FLJ11209","LSR5","FIAT","MGC126621","MGC126625","TXLNGX"],"prev_symbol":["CXorf15"]},"alphafold":{"accession":"Q9NUQ3","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NUQ3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NUQ3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NUQ3-F1-predicted_aligned_error_v6.png","plddt_mean":72.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TXLNG","jax_strain_url":"https://www.jax.org/strain/search?query=TXLNG"},"sequence":{"accession":"Q9NUQ3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NUQ3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NUQ3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NUQ3"}},"corpus_meta":[{"pmid":"15911876","id":"PMC_15911876","title":"FIAT represses ATF4-mediated transcription to regulate bone mass in transgenic mice.","date":"2005","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/15911876","citation_count":43,"is_preprint":false},{"pmid":"16831913","id":"PMC_16831913","title":"Inhibition of ATF4 transcriptional activity by FIAT/gamma-taxilin modulates bone mass accrual.","date":"2006","source":"Annals of the New York Academy of Sciences","url":"https://pubmed.ncbi.nlm.nih.gov/16831913","citation_count":26,"is_preprint":false},{"pmid":"18680144","id":"PMC_18680144","title":"FIAT represses bone matrix mineralization by interacting with ATF4 through its second leucine zipper.","date":"2008","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/18680144","citation_count":13,"is_preprint":false},{"pmid":"19016261","id":"PMC_19016261","title":"FIAT inhibition increases osteoblast activity by modulating Atf4-dependent functions.","date":"2009","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/19016261","citation_count":12,"is_preprint":false},{"pmid":"19232401","id":"PMC_19232401","title":"FIAT is co-expressed with its dimerization target ATF4 in early osteoblasts, but not in osteocytes.","date":"2009","source":"Gene expression patterns : GEP","url":"https://pubmed.ncbi.nlm.nih.gov/19232401","citation_count":12,"is_preprint":false},{"pmid":"23463631","id":"PMC_23463631","title":"Control of Fiat (factor inhibiting ATF4-mediated transcription) expression by Sp family transcription factors in osteoblasts.","date":"2013","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/23463631","citation_count":9,"is_preprint":false},{"pmid":"18083929","id":"PMC_18083929","title":"Identification of additional dimerization partners of FIAT, the factor inhibiting ATF4-mediated transcription.","date":"2007","source":"Annals of the New York Academy of Sciences","url":"https://pubmed.ncbi.nlm.nih.gov/18083929","citation_count":6,"is_preprint":false},{"pmid":"24440290","id":"PMC_24440290","title":"Altered gene dosage confirms the genetic interaction between FIAT and αNAC.","date":"2014","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/24440290","citation_count":6,"is_preprint":false},{"pmid":"24375853","id":"PMC_24375853","title":"SUMOylated αNAC potentiates transcriptional repression by FIAT.","date":"2014","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24375853","citation_count":5,"is_preprint":false},{"pmid":"20013796","id":"PMC_20013796","title":"FIAT control of osteoblast activity.","date":"2010","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/20013796","citation_count":4,"is_preprint":false},{"pmid":"20392257","id":"PMC_20392257","title":"FIAT, the factor-inhibiting ATF4-mediated transcription, also represses the transcriptional activity of the bZIP factor FRA-1.","date":"2010","source":"Annals of the New York Academy of Sciences","url":"https://pubmed.ncbi.nlm.nih.gov/20392257","citation_count":4,"is_preprint":false},{"pmid":"29514711","id":"PMC_29514711","title":"Improving interpretation of publically reported statistics on health and healthcare: the Figure Interpretation Assessment Tool (FIAT-Health).","date":"2018","source":"Health research policy and systems","url":"https://pubmed.ncbi.nlm.nih.gov/29514711","citation_count":4,"is_preprint":false},{"pmid":"37028586","id":"PMC_37028586","title":"TXLNG improves insulin resistance in obese subjects in vitro and in vivo by inhibiting ATF4 transcriptional activity.","date":"2023","source":"Molecular and cellular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/37028586","citation_count":3,"is_preprint":false},{"pmid":"27906582","id":"PMC_27906582","title":"FIAT Deletion Increases Bone Mass But Does Not Prevent High-Fat-Diet-Induced Metabolic Complications.","date":"2017","source":"Endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/27906582","citation_count":2,"is_preprint":false},{"pmid":"23518583","id":"PMC_23518583","title":"Fiat lux! Phylogeny and bioinformatics shed light on GABA functions in plants.","date":"2013","source":"Plant signaling & behavior","url":"https://pubmed.ncbi.nlm.nih.gov/23518583","citation_count":2,"is_preprint":false},{"pmid":"29949140","id":"PMC_29949140","title":"miR-98-TXLNG1 (FIAT)/Sp7 function loop mediates osteoblast mineralization.","date":"2018","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/29949140","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":9930,"output_tokens":3545,"usd":0.041482,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11217,"output_tokens":3635,"usd":0.07348,"stage2_stop_reason":"end_turn"},"total_usd":0.114962,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2005,\n      \"finding\": \"FIAT (TXLNG) is a leucine zipper nuclear protein that interacts with ATF4 to form inactive dimers, preventing ATF4 from binding to DNA and blocking ATF4-mediated transcription of the osteocalcin gene in vitro. Transgenic overexpression in osteoblasts reduced osteocalcin expression, decreased bone mineral density, and reduced mineral apposition rate, demonstrating cell-autonomous decrease in osteoblast activity.\",\n      \"method\": \"In vitro transcription assay, transgenic mouse overexpression, primary osteoblast cultures (alkaline phosphatase activity, mineralization), immunodetection\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional assays in vitro and in vivo, multiple orthogonal methods (DNA-binding inhibition, reporter assays, transgenic mice, primary cultures), replicated across multiple labs\",\n      \"pmids\": [\"15911876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FIAT/gamma-taxilin localizes to the nucleus in osteoblasts and dimerizes with ATF4 through its leucine zipper to form inactive dimers (lacking DNA-binding basic domain), thereby inhibiting ATF4-mediated transcription. FIAT also interacts with the transcriptional co-activator alphaNAC, suggesting an additional mechanism contributing to inhibition of ATF4-dependent osteocalcin gene transcription.\",\n      \"method\": \"Subcellular localization by immunofluorescence, co-immunoprecipitation, luciferase reporter assay\",\n      \"journal\": \"Annals of the New York Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, multiple assays but abstract-level detail; largely replicates/extends prior work with addition of alphaNAC interaction\",\n      \"pmids\": [\"16831913\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"FIAT interacts with Fra-1 (but not c-Jun) and specifically inhibits transcriptional activation by a c-Jun/Fra-1 heterodimer, without affecting c-Jun homodimer-mediated transcription. This identifies Fra-1 as a second transcriptional target of FIAT repressor activity.\",\n      \"method\": \"Transient transfection with AP-1-tk-luciferase reporter in MC3T3-E1 osteoblastic cells\",\n      \"journal\": \"Annals of the New York Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single lab, reporter assays in osteoblastic cells, replicated in a subsequent paper (PMID:20392257)\",\n      \"pmids\": [\"18083929\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"FIAT interacts with ATF4 through its second leucine zipper (LZ2, amino acids 194–222). Deletion or leucine-to-alanine mutation of LZ2 (L208A/L215A/L222A) abolished FIAT-ATF4 interaction and inhibition of ATF4-mediated transcription, as well as FIAT-mediated inhibition of mineralization. Mutations in LZ1 or LZ3 did not affect these activities.\",\n      \"method\": \"Deletion mutagenesis, site-specific mutagenesis, luciferase reporter assay in MC3T3-E1 cells, mineralization assay in stably transfected osteoblastic cells\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of active site (LZ2) with functional readouts (reporter assay + mineralization), single lab but multiple orthogonal methods and rigorous controls\",\n      \"pmids\": [\"18680144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"siRNA knockdown of FIAT in osteoblastic cells increased ATF4 occupancy on the osteocalcin promoter, enhanced osteocalcin reporter and endogenous gene expression, increased bone sialoprotein and type I collagen protein synthesis, and enhanced mineralization, confirming that FIAT negatively regulates ATF4 activity and osteoblast function.\",\n      \"method\": \"siRNA knockdown, chromatin immunoprecipitation (ChIP), luciferase reporter assay, immunoblotting, mineralization assay in MC3T3-E1 cells and primary osteoblasts\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with multiple orthogonal readouts (ChIP, reporter, endogenous gene expression, mineralization), single lab\",\n      \"pmids\": [\"19016261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"FIAT protein levels are inversely correlated with ATF4 protein levels during osteoblastogenesis. Decreased FIAT protein in mature osteoblasts coincides with increased ATF4 binding to the osteocalcin promoter and increased osteocalcin expression. In adult bone, FIAT is expressed in osteocytes while ATF4 is in active osteoblasts and lining cells but not osteocytes.\",\n      \"method\": \"Immunofluorescence, immunoblotting, RT-qPCR, chromatin immunoprecipitation (ChIP), immunohistochemistry of mouse long bones\",\n      \"journal\": \"Gene expression patterns : GEP\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization and expression quantification with functional correlate (ATF4 promoter occupancy), single lab\",\n      \"pmids\": [\"19232401\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"FIAT represses transcriptional activation by a FRA-1/c-JUN heterodimer (but not c-JUN homodimer) through its second leucine zipper. Natural FRA-1 target genes Mmp-9 and Mgp were used as reporters. This confirms FRA-1 as a second transcriptional target of FIAT.\",\n      \"method\": \"Luciferase reporter assays with natural FRA-1 target promoters (Mmp-9, Mgp), mutagenesis of FIAT LZ2, transient transfection in MC3T3-E1 cells\",\n      \"journal\": \"Annals of the New York Academy of Sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis mapped to LZ2, multiple reporter genes used, single lab\",\n      \"pmids\": [\"20392257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Sp1 and Sp3 (but not Sp7/OSTERIX) bind a canonical GC-box in the proximal Fiat promoter. Sp1 dose-dependently activates Fiat expression while both Sp3 isoforms dose-dependently repress it; Sp1 knockdown reduces and Sp3 knockdown increases endogenous FIAT expression, establishing Sp1/Sp3 interplay as a regulatory mechanism controlling Fiat gene expression in osteoblasts.\",\n      \"method\": \"EMSA, chromatin immunoprecipitation (ChIP), transient transfection luciferase reporter, siRNA knockdown, pharmacological inhibition (WP631)\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (EMSA, ChIP, reporter assay, RNAi, pharmacological), single lab but comprehensive mechanistic dissection\",\n      \"pmids\": [\"23463631\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SUMOylated αNAC (at K127, enhanced by phosphomimetic S132D mutation) specifically interacts with HDAC2 and potentiates FIAT-mediated transcriptional repression of the osteocalcin gene. This effect requires binding of SUMOylated αNAC to the target promoter, establishing a mechanism whereby maximal FIAT repression requires interaction with SUMOylated, HDAC2-associated αNAC.\",\n      \"method\": \"In vitro SUMOylation assay, mutagenesis (K127 and S132D), co-immunoprecipitation, luciferase reporter assay, ChIP in osteoblasts and calvarial tissue\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of SUMOylation, site-specific mutagenesis, ChIP, and reporter assay; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"24375853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Genetic interaction between FIAT and αNAC is demonstrated in vivo: compound Naca(+/-); Fiat(+/-) heterozygous mice show increased cortical porosity and elevated Dmp1 expression compared to single heterozygotes, confirming FIAT and αNAC act in a common genetic pathway controlling bone physiology.\",\n      \"method\": \"Compound heterozygous mouse model, microcomputed tomography (μCT), RT-qPCR\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis in compound heterozygotes with defined phenotypic readout, single lab\",\n      \"pmids\": [\"24440290\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"FIAT knockout (Fiat-/Y) mice show increased trabecular and cortical bone mass with increased mineral apposition rate and osteoblast function, confirming FIAT is a negative regulator of osteoblast activity in vivo. Loss of FIAT also increased susceptibility to fat accumulation and metabolic disturbance (reduced fatty acid oxidation and lipolysis, upregulated Scd1) on high-fat diet.\",\n      \"method\": \"Fiat knockout mice, microcomputed tomography, histomorphometry, biomechanical testing, gene expression analysis, metabolic phenotyping\",\n      \"journal\": \"Endocrinology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic loss-of-function (knockout) with multiple orthogonal readouts (μCT, histomorphometry, biomechanics, metabolic measures), single lab\",\n      \"pmids\": [\"27906582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"FIAT (TXLNG) is a direct target of miR-98; miR-98 overexpression reduces FIAT protein and promotes osteoblast mineralization. Sp7 promotes miR-98 transcription by binding the miR-98 promoter region, creating a miR-98/FIAT/Sp7 regulatory loop in osteoblast mineralization.\",\n      \"method\": \"Luciferase reporter assay (miR-98 target validation), EMSA, ChIP, promoter luciferase assay, overexpression and knockdown experiments\",\n      \"journal\": \"European review for medical and pharmacological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — multiple assays but single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"29949140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TXLNG overexpression in adipocytes reverses high-glucose/high-insulin-induced insulin resistance by restoring glucose uptake, GLUT4 surface levels, and Akt phosphorylation, and reducing IL-6 and TNF-α expression. This effect is mediated through inhibition of ATF4 transcriptional activity; ATF4 overexpression abolishes the improvements in insulin-resistant adipocyte dysfunction caused by TXLNG overexpression. TXLNG overexpression in HFD mice reduced body weight, adipose weight, adipocyte size, and pro-inflammatory markers.\",\n      \"method\": \"TXLNG overexpression and knockdown in 3T3-L1 adipocytes, HFD mouse model, glucose uptake assay, immunoblotting (GLUT4, Akt phosphorylation), RT-qPCR\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss- and gain-of-function with defined molecular readouts and epistasis (ATF4 rescue), single lab\",\n      \"pmids\": [\"37028586\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TXLNG (FIAT/gamma-taxilin) is a nuclear leucine zipper protein lacking a DNA-binding domain that acts as a transcriptional repressor by heterodimerizing with bZIP transcription factors (primarily ATF4, and also Fra-1) through its second leucine zipper, preventing them from binding DNA; maximal repression is potentiated by interaction with SUMOylated αNAC/HDAC2; its expression in osteoblasts is regulated by Sp1/Sp3 and by miR-98, its activity controls osteoblast function and bone mass accrual in vivo, and it also modulates insulin resistance through ATF4 inhibition in adipose tissue.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TXLNG (FIAT/gamma-taxilin) is a nuclear leucine zipper protein that functions as a transcriptional repressor controlling osteoblast activity and bone mass accrual [#0, #10]. Lacking a basic DNA-binding domain, FIAT heterodimerizes with the bZIP transcription factor ATF4 through its second leucine zipper (LZ2, residues 194–222), forming transcriptionally inactive dimers that cannot bind DNA and thereby blocking ATF4-mediated transcription of the osteocalcin gene; mutation of LZ2 abolishes both the ATF4 interaction and repression of mineralization [#0, #3]. Loss-of-function studies confirm this repressor role: FIAT knockdown increases ATF4 occupancy on the osteocalcin promoter and enhances osteoblast differentiation [#4], and Fiat-knockout mice display increased bone mass alongside increased susceptibility to fat accumulation and metabolic disturbance [#10]. FIAT also represses FRA-1/c-JUN heterodimer-driven transcription through LZ2, extending its repressor activity to a second bZIP target [#6]. Maximal repression of osteocalcin requires interaction with SUMOylated αNAC associated with HDAC2 at the target promoter [#8], and Fiat expression itself is controlled by opposing Sp1/Sp3 inputs at a proximal GC-box and by miR-98 [#7, #11]. Beyond bone, TXLNG improves insulin sensitivity in adipocytes by inhibiting ATF4 transcriptional activity, linking the same repressor mechanism to metabolic regulation [#12].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established that FIAT acts as a dominant-negative repressor of ATF4 by forming inactive dimers, defining a molecular brake on osteoblast activity in vivo.\",\n      \"evidence\": \"In vitro transcription/reporter assays plus transgenic osteoblast-targeted overexpression with bone densitometry and mineralization readouts\",\n      \"pmids\": [\"15911876\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map the interaction interface\", \"Did not test endogenous loss-of-function\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Confirmed nuclear localization and leucine-zipper-mediated ATF4 dimerization and identified αNAC as an additional FIAT partner contributing to repression.\",\n      \"evidence\": \"Immunofluorescence, co-immunoprecipitation, and luciferase reporter assays in osteoblasts\",\n      \"pmids\": [\"16831913\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"αNAC interaction mechanism not resolved\", \"abstract-level detail only\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended FIAT's repressor specificity beyond ATF4 to the AP-1 family by showing it inhibits c-Jun/Fra-1 heterodimers but not c-Jun homodimers.\",\n      \"evidence\": \"AP-1-tk-luciferase reporter assays in MC3T3-E1 osteoblastic cells\",\n      \"pmids\": [\"18083929\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not map binding region for Fra-1\", \"single reporter system\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mapped the ATF4-binding and repressor activity to the second leucine zipper (LZ2), defining the functional interaction module.\",\n      \"evidence\": \"Deletion and L-to-A site-specific mutagenesis with reporter and mineralization assays in osteoblastic cells\",\n      \"pmids\": [\"18680144\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of the heterodimer interface\", \"LZ1/LZ3 functions undefined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrated by loss-of-function that endogenous FIAT restrains ATF4 promoter occupancy and osteoblast differentiation, validating it as a negative regulator.\",\n      \"evidence\": \"siRNA knockdown with ChIP, reporter, endogenous gene expression, and mineralization assays\",\n      \"pmids\": [\"19016261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo knockdown not addressed\", \"effect on Fra-1 targets endogenously untested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed reciprocal FIAT/ATF4 protein dynamics and cell-type partitioning across osteoblastogenesis, linking FIAT downregulation to osteoblast maturation.\",\n      \"evidence\": \"Immunofluorescence, immunoblotting, RT-qPCR, ChIP, and immunohistochemistry of mouse long bones\",\n      \"pmids\": [\"19232401\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism driving FIAT downregulation not yet defined\", \"correlative in adult bone\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Confirmed FIAT represses FRA-1/c-JUN heterodimer activity via LZ2 using natural target promoters, generalizing its bZIP repressor mechanism.\",\n      \"evidence\": \"Luciferase reporters on natural FRA-1 targets (Mmp-9, Mgp) with LZ2 mutagenesis in MC3T3-E1 cells\",\n      \"pmids\": [\"20392257\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological role of Fra-1 repression in bone not established\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined upstream transcriptional control of Fiat by antagonistic Sp1 (activating) and Sp3 (repressing) binding at a proximal GC-box.\",\n      \"evidence\": \"EMSA, ChIP, reporter assays, siRNA knockdown, and pharmacological inhibition in osteoblasts\",\n      \"pmids\": [\"23463631\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Signals controlling Sp1/Sp3 balance unknown\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established that maximal FIAT repression requires SUMOylated, HDAC2-associated αNAC bound at the target promoter, adding a co-repressor layer to the mechanism.\",\n      \"evidence\": \"In vitro SUMOylation, site-specific mutagenesis (K127, S132D), co-IP, ChIP, and reporter assays in osteoblasts/calvaria\",\n      \"pmids\": [\"24375853\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SUMOylation is regulated in vivo not addressed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated in vivo genetic epistasis between Fiat and Naca, placing them in a common pathway controlling bone physiology.\",\n      \"evidence\": \"Compound heterozygous mice analyzed by microCT and RT-qPCR\",\n      \"pmids\": [\"24440290\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cell-type and molecular basis of cortical porosity phenotype unresolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Genetic deletion confirmed FIAT as a negative regulator of bone mass in vivo and revealed an unexpected metabolic role in fat accumulation and lipid handling.\",\n      \"evidence\": \"Fiat-knockout mice with microCT, histomorphometry, biomechanics, and metabolic phenotyping on high-fat diet\",\n      \"pmids\": [\"27906582\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue source of metabolic phenotype not dissected\", \"molecular link to Scd1 not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified post-transcriptional control of FIAT by miR-98 within an Sp7-driven regulatory loop modulating osteoblast mineralization.\",\n      \"evidence\": \"miR-98 target reporter validation, EMSA, ChIP, promoter reporters, and overexpression/knockdown\",\n      \"pmids\": [\"29949140\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Loop dynamics in vivo untested\", \"abstract-level mechanistic detail\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Extended the ATF4-repressor mechanism to adipocytes, showing TXLNG improves insulin sensitivity by inhibiting ATF4 transcriptional activity.\",\n      \"evidence\": \"Gain/loss-of-function in 3T3-L1 adipocytes and HFD mice with glucose uptake, GLUT4/Akt readouts, and ATF4 epistasis rescue\",\n      \"pmids\": [\"37028586\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct ATF4 targets in adipocytes not mapped\", \"single lab\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown what signals dynamically control FIAT abundance and bZIP partner choice across tissues, and whether its repressor function operates in non-bone, non-adipose contexts.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of FIAT-bZIP heterodimers\", \"Tissue-specific partner spectrum undefined\", \"Human disease relevance not established in the corpus\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 3, 4, 6]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 4, 6]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 10]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [10, 12]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"ATF4\", \"FOSL1\", \"JUN\", \"NACA\", \"HDAC2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}