{"gene":"TENT5A","run_date":"2026-04-28T21:42:58","timeline":{"discoveries":[{"year":2021,"finding":"TENT5A is a cytoplasmic poly(A) polymerase that is induced during osteoblast differentiation and polyadenylates mRNAs encoding Col1α1, Col1α2, and other secreted proteins involved in osteogenesis, increasing their expression. Tent5a knockout mice display bone fragility and skeletal hypomineralization resulting from quantitative and qualitative collagen defects.","method":"Direct RNA sequencing (nanopore), Tent5a knockout mouse model, in vitro osteoblast differentiation assays","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1-2 — direct RNA sequencing to identify substrates, KO mouse with defined skeletal phenotype, multiple orthogonal methods in single study","pmids":["33882302"],"is_preprint":false},{"year":2025,"finding":"TENT5A poly(A) polymerase, induced by mRNA vaccines, re-adenylates therapeutic mRNA poly(A) tails (extending them up to 200 nt) in macrophages, stabilizing target mRNAs. Re-adenylation is preferentially observed for mRNAs encoding ER-targeted proteins due to spatial proximity to ER-resident TENT5A. TENT5A deficiency reduces specific immunoglobulin production after mRNA vaccination in mice.","method":"Nanopore direct RNA sequencing of individual vaccine mRNA molecules, TENT5A knockout mouse immunization experiments, macrophage cell models","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 — nanopore sequencing of individual molecules, KO mouse with defined immune phenotype, multiple orthogonal methods","pmids":["40240603"],"is_preprint":false},{"year":2020,"finding":"FAM46A (TENT5A) is a nucleocytoplasmic shuttle protein that is Tyr-phosphorylated only in the cytosol, where it associates closely with ER, while in the nucleus it localizes proximal to chromatin regions of active transcription. It is a cell cycle-dependent poly-ubiquitinated short-lived protein degraded by the proteasome. Its non-canonical poly(A) polymerase activity (confirmed by site-directed mutagenesis) is essential for enhanced hemin-induced hemoglobinization in K562 cells.","method":"Site-directed mutagenesis of catalytic residues, subcellular fractionation, immunofluorescence, poly-ubiquitination assays, overexpression in K562 cells","journal":"Frontiers in cell and developmental biology","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis confirms enzymatic activity, localization by fractionation and imaging, single lab study","pmids":["32528962"],"is_preprint":false},{"year":2018,"finding":"Xenopus Fam46a physically interacts with Smad1/Smad4 and positively regulates BMP signaling, which is required for pre-placodal ectoderm (PPE) formation. Fam46a knockdown induces eye formation abnormalities and body color defects, and reduces PPE gene expression while increasing neural crest formation.","method":"Co-immunoprecipitation (Smad1/Smad4 interaction), Fam46a knockdown (morpholino), in situ hybridization, epistasis in Xenopus embryos","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2-3 — Co-IP identifies binding partners, KD with defined developmental phenotype, but single lab in Xenopus ortholog model","pmids":["30291163"],"is_preprint":false},{"year":2022,"finding":"Tent5a knockdown in C2C12 myoblasts inhibits cell proliferation, migration, and maturation of type I muscle fibers both in vitro and in vivo, mechanistically by decreasing myogenin expression, indicating TENT5A maintains myogenin mRNA stability.","method":"Tent5a knockdown (siRNA/shRNA), CCK-8 proliferation assay, wound-healing assay, TUNEL apoptosis assay, immunofluorescence, qPCR, in vivo muscle fiber analysis","journal":"Cell proliferation","confidence":"Medium","confidence_rationale":"Tier 3 — KD with multiple cellular phenotypic readouts and downstream mechanistic link to myogenin, single lab","pmids":["35137485"],"is_preprint":false},{"year":2024,"finding":"TENT5A is transcriptionally activated by EGR1 (which directly binds the TENT5A promoter) and interacts with RPL35 (identified by Co-IP, GST pull-down, and MS), negatively regulating the mTOR pathway via ribosome biogenesis. The Gly122 residue is critical for TENT5A's tumor-suppressive function in hepatocellular carcinoma.","method":"Chromatin immunoprecipitation, dual-luciferase reporter assay, Co-IP combined with mass spectrometry, GST pull-down, site-directed mutagenesis (Gly122), gain/loss-of-function experiments","journal":"Cellular oncology (Dordrecht, Netherlands)","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (ChIP, Co-IP/MS, GST pull-down, mutagenesis), single lab","pmids":["39570560"],"is_preprint":false},{"year":2026,"finding":"TENT5A directly binds MYC mRNA via its PAP/OAS1 domain, extends its poly(A) tail, and stabilizes the transcript, thereby reinforcing MYC-driven stemness and chemoresistance in osteosarcoma. Pharmacologic inhibition of TENT5A disrupts MYC mRNA stabilization and shortens poly(A) tails.","method":"Biochemical binding assays, poly(A) tail length measurements, gain/loss-of-function assays, orthotopic xenografts, patient-derived organoids, multi-omics and single-cell transcriptomics","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — direct RNA binding and poly(A) extension demonstrated biochemically, confirmed in multiple in vivo models, single lab","pmids":["41616089"],"is_preprint":false},{"year":2026,"finding":"Patient-derived fibroblasts with a homozygous TENT5A variant (p.Ile324Met) show significantly shortened poly(A) tails on COL1A1 and COL1A2 transcripts (detected by Nanopore direct RNA sequencing), reduced collagen mRNA expression, impaired mineralization, and selective downregulation of ECM and osteogenic genes, confirming TENT5A's role in stabilizing collagen mRNAs via polyadenylation in human osteoblasts.","method":"Nanopore direct RNA sequencing of poly(A) tails in patient-derived fibroblasts, RNA-seq, qPCR, matrix mineralization assays","journal":"JBMR plus","confidence":"Medium","confidence_rationale":"Tier 2 — direct poly(A) tail sequencing in patient-derived cells with defined molecular and cellular phenotype, single case study","pmids":["41908159"],"is_preprint":false}],"current_model":"TENT5A is a cytoplasmic non-canonical poly(A) polymerase that stabilizes target mRNAs (including COL1A1, COL1A2, MYC, and myogenin) by extending their poly(A) tails; it is ER-associated, induced during osteoblast differentiation and by mRNA vaccines in macrophages, interacts with Smad1/Smad4 to modulate BMP signaling and with RPL35 to regulate ribosome biogenesis/mTOR, and its catalytic activity is required for bone matrix production, hemoglobinization, muscle fiber maturation, and effective mRNA vaccine immunogenicity."},"narrative":{"teleology":[{"year":2018,"claim":"Before TENT5A's enzymatic function was characterized, its developmental role was unclear; co-immunoprecipitation in Xenopus showed that Fam46a physically interacts with Smad1/Smad4 and positively regulates BMP signaling, establishing TENT5A as a modulator of a major developmental signaling pathway.","evidence":"Co-immunoprecipitation and morpholino knockdown epistasis in Xenopus embryos","pmids":["30291163"],"confidence":"Medium","gaps":["Interaction demonstrated only in Xenopus; mammalian confirmation of Smad binding is lacking","Whether the poly(A) polymerase activity is required for BMP pathway modulation is unknown","Downstream mRNA targets through which BMP signaling is affected are not identified"]},{"year":2020,"claim":"The biochemical identity of TENT5A as an active non-canonical poly(A) polymerase was confirmed by site-directed mutagenesis of catalytic residues, and its subcellular behavior—ER-associated in the cytosol, nucleocytoplasmic shuttling, cell-cycle-dependent proteasomal degradation—was defined, establishing it as a regulated, short-lived enzyme.","evidence":"Site-directed mutagenesis, subcellular fractionation, poly-ubiquitination assays, and overexpression in K562 erythroid cells","pmids":["32528962"],"confidence":"Medium","gaps":["Single-lab study; independent confirmation of nucleocytoplasmic shuttling not yet available","Endogenous mRNA substrates were not identified in this system","Structural basis of catalytic activity not resolved"]},{"year":2021,"claim":"The key physiological question—what mRNAs does TENT5A polyadenylate and what happens without it—was answered by nanopore sequencing and a knockout mouse, revealing that TENT5A polyadenylates collagen and other secreted-protein mRNAs during osteoblast differentiation, and that its loss causes bone fragility and hypomineralization.","evidence":"Nanopore direct RNA sequencing, Tent5a knockout mouse phenotyping, in vitro osteoblast differentiation","pmids":["33882302"],"confidence":"High","gaps":["Whether TENT5A directly binds its osteoblast mRNA substrates or requires cofactors for target selection is not established","Mechanism by which poly(A) tail extension increases mRNA stability in this context is not defined"]},{"year":2022,"claim":"Extending TENT5A's functional scope beyond bone, knockdown experiments showed it is required for myoblast proliferation, migration, and type I muscle fiber maturation, acting at least in part by maintaining myogenin mRNA levels.","evidence":"siRNA/shRNA knockdown in C2C12 myoblasts with proliferation, migration, apoptosis, and in vivo muscle fiber assays","pmids":["35137485"],"confidence":"Medium","gaps":["Direct polyadenylation of myogenin mRNA by TENT5A was not demonstrated","Single-lab study without knockout validation","Contribution to muscle physiology in vivo in a genetic model is not tested"]},{"year":2024,"claim":"A non-polyadenylation interaction was uncovered: TENT5A binds RPL35 and negatively regulates the mTOR pathway through effects on ribosome biogenesis, while its own transcription is directly activated by EGR1, providing mechanistic context for its tumor-suppressive function in hepatocellular carcinoma.","evidence":"ChIP, dual-luciferase reporter, Co-IP/mass spectrometry, GST pull-down, and Gly122 mutagenesis","pmids":["39570560"],"confidence":"Medium","gaps":["Whether ribosome biogenesis regulation requires TENT5A's poly(A) polymerase activity or represents a separate function is unknown","Single-lab study; RPL35 interaction not validated in non-cancer cell types","Mechanism linking RPL35 binding to mTOR suppression is not fully delineated"]},{"year":2025,"claim":"TENT5A's role was extended to innate immunity: it re-adenylates mRNA vaccine transcripts in macrophages (extending poly(A) tails up to ~200 nt), preferentially acting on ER-targeted mRNAs due to spatial proximity, and its loss reduces vaccine-induced antibody responses.","evidence":"Nanopore direct RNA sequencing of individual vaccine mRNA molecules, TENT5A knockout mouse immunization","pmids":["40240603"],"confidence":"High","gaps":["Whether TENT5A re-adenylates endogenous innate immune mRNAs beyond vaccine transcripts is not established","Mechanism of TENT5A induction by mRNA vaccines is not defined"]},{"year":2026,"claim":"TENT5A was shown to directly bind MYC mRNA via its PAP/OAS1 domain and extend its poly(A) tail, stabilizing MYC to drive stemness and chemoresistance in osteosarcoma, revealing a pathological gain-of-function role.","evidence":"Biochemical binding assays, poly(A) tail measurements, orthotopic xenografts, patient-derived organoids, multi-omics","pmids":["41616089"],"confidence":"Medium","gaps":["Whether MYC mRNA is a physiological target outside osteosarcoma is unknown","Selectivity mechanism for MYC mRNA binding versus other transcripts is not defined"]},{"year":2026,"claim":"Human genetic validation came from patient-derived fibroblasts carrying a homozygous TENT5A p.Ile324Met variant, which showed shortened poly(A) tails on COL1A1/COL1A2, reduced collagen expression, and impaired mineralization, confirming TENT5A's role in human bone disease.","evidence":"Nanopore direct RNA sequencing of poly(A) tails, RNA-seq, mineralization assays in patient-derived fibroblasts","pmids":["41908159"],"confidence":"Medium","gaps":["Single patient/family; broader genotype-phenotype spectrum not established","Whether the Ile324Met variant affects catalytic activity, substrate binding, or protein stability is not determined"]},{"year":null,"claim":"The structural basis of TENT5A substrate selectivity—how it distinguishes among the hundreds of ER-proximal mRNAs—and whether its poly(A) polymerase and RPL35-mediated ribosome/mTOR functions are mechanistically separable remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No crystal or cryo-EM structure of TENT5A or TENT5A–RNA complex is available","RNA-binding specificity determinants beyond the PAP/OAS1 domain are not mapped","Relationship between poly(A) polymerase activity and RPL35/mTOR regulation is not dissected"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0,1,2,6,7]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[6]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[1,2]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[3,4]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,5]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[1]}],"complexes":[],"partners":["SMAD1","SMAD4","RPL35","COL1A1","COL1A2"],"other_free_text":[]},"mechanistic_narrative":"TENT5A is a non-canonical cytoplasmic poly(A) polymerase that stabilizes target mRNAs by extending their poly(A) tails, thereby controlling the expression of secreted and structural proteins critical for osteogenesis, myogenesis, erythroid differentiation, and immune responses to mRNA vaccines [PMID:33882302, PMID:35137485, PMID:32528962, PMID:40240603]. It associates with the endoplasmic reticulum and preferentially polyadenylates mRNAs encoding ER-targeted proteins, including COL1A1, COL1A2, MYC, and myogenin, with its catalytic poly(A) polymerase activity (dependent on an intact PAP/OAS1 domain) being essential for these functions [PMID:33882302, PMID:40240603, PMID:41616089, PMID:35137485]. TENT5A physically interacts with Smad1/Smad4 to positively regulate BMP signaling during embryonic development and with RPL35 to negatively regulate mTOR signaling via effects on ribosome biogenesis [PMID:30291163, PMID:39570560]. Loss-of-function mutations in TENT5A cause bone fragility and skeletal hypomineralization due to collagen defects, as demonstrated in knockout mice and in patient-derived cells carrying a homozygous p.Ile324Met variant [PMID:33882302, PMID:41908159]."},"prefetch_data":{"uniprot":{"accession":"Q96IP4","full_name":"Terminal nucleotidyltransferase 5A","aliases":["HBV X-transactivated gene 11 protein","HBV XAg-transactivated protein 11"],"length_aa":442,"mass_kda":49.7,"function":"Cytoplasmic non-canonical poly(A) RNA polymerase that catalyzes the transfer of one adenosine molecule from an ATP to an mRNA poly(A) tail bearing a 3'-OH terminal group and participates in the cytoplasmic polyadenylation (PubMed:33882302). Polyadenylates mRNA encoding extracellular matrix constituents and other genes crucial for bone mineralization and during osteoblast mineralization, mainly focuses on ER-targeted mRNAs (By similarity)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q96IP4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TENT5A","classification":"Not Classified","n_dependent_lines":3,"n_total_lines":1208,"dependency_fraction":0.0024834437086092716},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TENT5A","total_profiled":1310},"omim":[{"mim_id":"617952","title":"OSTEOGENESIS IMPERFECTA, TYPE XVIII; OI18","url":"https://www.omim.org/entry/617952"},{"mim_id":"611357","title":"TERMINAL NUCLEOTIDYLTRANSFERASE 5A; TENT5A","url":"https://www.omim.org/entry/611357"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":213.3},{"tissue":"salivary gland","ntpm":98.3}],"url":"https://www.proteinatlas.org/search/TENT5A"},"hgnc":{"alias_symbol":["FLJ20037"],"prev_symbol":["C6orf37","FAM46A"]},"alphafold":{"accession":"Q96IP4","domains":[{"cath_id":"-","chopping":"60-283","consensus_level":"medium","plddt":94.9528,"start":60,"end":283},{"cath_id":"-","chopping":"289-405","consensus_level":"medium","plddt":88.707,"start":289,"end":405}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96IP4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96IP4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96IP4-F1-predicted_aligned_error_v6.png","plddt_mean":79.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TENT5A","jax_strain_url":"https://www.jax.org/strain/search?query=TENT5A"},"sequence":{"accession":"Q96IP4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96IP4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96IP4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96IP4"}},"corpus_meta":[{"pmid":"29358272","id":"PMC_29358272","title":"FAM46A mutations are responsible for autosomal recessive osteogenesis imperfecta.","date":"2018","source":"Journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29358272","citation_count":55,"is_preprint":false},{"pmid":"33882302","id":"PMC_33882302","title":"Cytoplasmic polyadenylation by TENT5A is required for proper bone formation.","date":"2021","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/33882302","citation_count":38,"is_preprint":false},{"pmid":"12054608","id":"PMC_12054608","title":"Identification and characterization of C6orf37, a novel candidate human retinal disease gene on chromosome 6q14.","date":"2002","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/12054608","citation_count":35,"is_preprint":false},{"pmid":"17803723","id":"PMC_17803723","title":"Genetic analysis of FAM46A in Spanish families with autosomal recessive retinitis pigmentosa: characterisation of novel VNTRs.","date":"2007","source":"Annals of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17803723","citation_count":32,"is_preprint":false},{"pmid":"26803617","id":"PMC_26803617","title":"Exome sequencing identifies a nonsense mutation in Fam46a associated with bone abnormalities in a new mouse model for skeletal dysplasia.","date":"2016","source":"Mammalian genome : official journal of the International Mammalian Genome Society","url":"https://pubmed.ncbi.nlm.nih.gov/26803617","citation_count":31,"is_preprint":false},{"pmid":"25884493","id":"PMC_25884493","title":"Association of the FAM46A gene VNTRs and BAG6 rs3117582 SNP with non small cell lung cancer (NSCLC) in Croatian and Norwegian populations.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/25884493","citation_count":24,"is_preprint":false},{"pmid":"40240603","id":"PMC_40240603","title":"Re-adenylation by TENT5A enhances efficacy of SARS-CoV-2 mRNA vaccines.","date":"2025","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/40240603","citation_count":20,"is_preprint":false},{"pmid":"30291163","id":"PMC_30291163","title":"Fam46a regulates BMP-dependent pre-placodal ectoderm differentiation in Xenopus.","date":"2018","source":"Development (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/30291163","citation_count":20,"is_preprint":false},{"pmid":"25231575","id":"PMC_25231575","title":"Susceptibility to large-joint osteoarthritis (hip and knee) is associated with BAG6 rs3117582 SNP and the VNTR polymorphism in the second exon of the FAM46A gene on chromosome 6.","date":"2014","source":"Journal of orthopaedic research : official publication of the Orthopaedic Research Society","url":"https://pubmed.ncbi.nlm.nih.gov/25231575","citation_count":20,"is_preprint":false},{"pmid":"35137485","id":"PMC_35137485","title":"Tent5a modulates muscle fiber formation in adolescent idiopathic scoliosis via maintenance of myogenin expression.","date":"2022","source":"Cell proliferation","url":"https://pubmed.ncbi.nlm.nih.gov/35137485","citation_count":17,"is_preprint":false},{"pmid":"24625963","id":"PMC_24625963","title":"Association of variable number of tandem repeats in the coding region of the FAM46A gene, FAM46A rs11040 SNP and BAG6 rs3117582 SNP with susceptibility to tuberculosis.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24625963","citation_count":15,"is_preprint":false},{"pmid":"19740458","id":"PMC_19740458","title":"Family-with-sequence-similarity-46, member A (Fam46a) gene is expressed in developing tooth buds.","date":"2009","source":"Archives of oral biology","url":"https://pubmed.ncbi.nlm.nih.gov/19740458","citation_count":14,"is_preprint":false},{"pmid":"16545789","id":"PMC_16545789","title":"Identification of a novel VNTR polymorphism in C6orf37 and its association with colorectal cancer risk in Chinese population.","date":"2006","source":"Clinica chimica acta; international journal of clinical chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/16545789","citation_count":10,"is_preprint":false},{"pmid":"32528962","id":"PMC_32528962","title":"Overexpression of FAM46A, a Non-canonical Poly(A) Polymerase, Promotes Hemin-Induced Hemoglobinization in K562 Cells.","date":"2020","source":"Frontiers in cell and developmental biology","url":"https://pubmed.ncbi.nlm.nih.gov/32528962","citation_count":8,"is_preprint":false},{"pmid":"39570560","id":"PMC_39570560","title":"TENT5A mediates the cancer-inhibiting effects of EGR1 by suppressing the protein stability of RPL35 in hepatocellular carcinoma.","date":"2024","source":"Cellular oncology (Dordrecht, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/39570560","citation_count":3,"is_preprint":false},{"pmid":"38204269","id":"PMC_38204269","title":"TENT5A Increases Glioma Malignancy and Promotes its Progression.","date":"2025","source":"Recent patents on anti-cancer drug discovery","url":"https://pubmed.ncbi.nlm.nih.gov/38204269","citation_count":2,"is_preprint":false},{"pmid":"37141460","id":"PMC_37141460","title":"A Genetic Variant of FAM46A is Associated With the Development of Adolescent Idiopathic Scoliosis in the Chinese Population.","date":"2023","source":"Spine","url":"https://pubmed.ncbi.nlm.nih.gov/37141460","citation_count":2,"is_preprint":false},{"pmid":"41908159","id":"PMC_41908159","title":"Impaired bone matrix turnover with selective small bone fragility in a child with TENT5A-associated osteogenesis imperfecta.","date":"2026","source":"JBMR plus","url":"https://pubmed.ncbi.nlm.nih.gov/41908159","citation_count":0,"is_preprint":false},{"pmid":"41616089","id":"PMC_41616089","title":"TENT5A Maintains MYC mRNA Stability to Enhance Osteosarcoma Stemness.","date":"2026","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/41616089","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":10810,"output_tokens":2192,"usd":0.032655},"stage2":{"model":"claude-opus-4-6","input_tokens":5469,"output_tokens":5421,"usd":0.244305},"total_usd":0.27696,"stage1_batch_id":"msgbatch_01RPbVc9PDH9zQmYK5Hs6srm","stage2_batch_id":"msgbatch_01JVbVLzeKN2yVrsGp3zC8aM","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2021,\n      \"finding\": \"TENT5A is a cytoplasmic poly(A) polymerase that is induced during osteoblast differentiation and polyadenylates mRNAs encoding Col1α1, Col1α2, and other secreted proteins involved in osteogenesis, increasing their expression. Tent5a knockout mice display bone fragility and skeletal hypomineralization resulting from quantitative and qualitative collagen defects.\",\n      \"method\": \"Direct RNA sequencing (nanopore), Tent5a knockout mouse model, in vitro osteoblast differentiation assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct RNA sequencing to identify substrates, KO mouse with defined skeletal phenotype, multiple orthogonal methods in single study\",\n      \"pmids\": [\"33882302\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TENT5A poly(A) polymerase, induced by mRNA vaccines, re-adenylates therapeutic mRNA poly(A) tails (extending them up to 200 nt) in macrophages, stabilizing target mRNAs. Re-adenylation is preferentially observed for mRNAs encoding ER-targeted proteins due to spatial proximity to ER-resident TENT5A. TENT5A deficiency reduces specific immunoglobulin production after mRNA vaccination in mice.\",\n      \"method\": \"Nanopore direct RNA sequencing of individual vaccine mRNA molecules, TENT5A knockout mouse immunization experiments, macrophage cell models\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — nanopore sequencing of individual molecules, KO mouse with defined immune phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"40240603\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"FAM46A (TENT5A) is a nucleocytoplasmic shuttle protein that is Tyr-phosphorylated only in the cytosol, where it associates closely with ER, while in the nucleus it localizes proximal to chromatin regions of active transcription. It is a cell cycle-dependent poly-ubiquitinated short-lived protein degraded by the proteasome. Its non-canonical poly(A) polymerase activity (confirmed by site-directed mutagenesis) is essential for enhanced hemin-induced hemoglobinization in K562 cells.\",\n      \"method\": \"Site-directed mutagenesis of catalytic residues, subcellular fractionation, immunofluorescence, poly-ubiquitination assays, overexpression in K562 cells\",\n      \"journal\": \"Frontiers in cell and developmental biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis confirms enzymatic activity, localization by fractionation and imaging, single lab study\",\n      \"pmids\": [\"32528962\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Xenopus Fam46a physically interacts with Smad1/Smad4 and positively regulates BMP signaling, which is required for pre-placodal ectoderm (PPE) formation. Fam46a knockdown induces eye formation abnormalities and body color defects, and reduces PPE gene expression while increasing neural crest formation.\",\n      \"method\": \"Co-immunoprecipitation (Smad1/Smad4 interaction), Fam46a knockdown (morpholino), in situ hybridization, epistasis in Xenopus embryos\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — Co-IP identifies binding partners, KD with defined developmental phenotype, but single lab in Xenopus ortholog model\",\n      \"pmids\": [\"30291163\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Tent5a knockdown in C2C12 myoblasts inhibits cell proliferation, migration, and maturation of type I muscle fibers both in vitro and in vivo, mechanistically by decreasing myogenin expression, indicating TENT5A maintains myogenin mRNA stability.\",\n      \"method\": \"Tent5a knockdown (siRNA/shRNA), CCK-8 proliferation assay, wound-healing assay, TUNEL apoptosis assay, immunofluorescence, qPCR, in vivo muscle fiber analysis\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — KD with multiple cellular phenotypic readouts and downstream mechanistic link to myogenin, single lab\",\n      \"pmids\": [\"35137485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TENT5A is transcriptionally activated by EGR1 (which directly binds the TENT5A promoter) and interacts with RPL35 (identified by Co-IP, GST pull-down, and MS), negatively regulating the mTOR pathway via ribosome biogenesis. The Gly122 residue is critical for TENT5A's tumor-suppressive function in hepatocellular carcinoma.\",\n      \"method\": \"Chromatin immunoprecipitation, dual-luciferase reporter assay, Co-IP combined with mass spectrometry, GST pull-down, site-directed mutagenesis (Gly122), gain/loss-of-function experiments\",\n      \"journal\": \"Cellular oncology (Dordrecht, Netherlands)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (ChIP, Co-IP/MS, GST pull-down, mutagenesis), single lab\",\n      \"pmids\": [\"39570560\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"TENT5A directly binds MYC mRNA via its PAP/OAS1 domain, extends its poly(A) tail, and stabilizes the transcript, thereby reinforcing MYC-driven stemness and chemoresistance in osteosarcoma. Pharmacologic inhibition of TENT5A disrupts MYC mRNA stabilization and shortens poly(A) tails.\",\n      \"method\": \"Biochemical binding assays, poly(A) tail length measurements, gain/loss-of-function assays, orthotopic xenografts, patient-derived organoids, multi-omics and single-cell transcriptomics\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct RNA binding and poly(A) extension demonstrated biochemically, confirmed in multiple in vivo models, single lab\",\n      \"pmids\": [\"41616089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Patient-derived fibroblasts with a homozygous TENT5A variant (p.Ile324Met) show significantly shortened poly(A) tails on COL1A1 and COL1A2 transcripts (detected by Nanopore direct RNA sequencing), reduced collagen mRNA expression, impaired mineralization, and selective downregulation of ECM and osteogenic genes, confirming TENT5A's role in stabilizing collagen mRNAs via polyadenylation in human osteoblasts.\",\n      \"method\": \"Nanopore direct RNA sequencing of poly(A) tails in patient-derived fibroblasts, RNA-seq, qPCR, matrix mineralization assays\",\n      \"journal\": \"JBMR plus\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct poly(A) tail sequencing in patient-derived cells with defined molecular and cellular phenotype, single case study\",\n      \"pmids\": [\"41908159\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TENT5A is a cytoplasmic non-canonical poly(A) polymerase that stabilizes target mRNAs (including COL1A1, COL1A2, MYC, and myogenin) by extending their poly(A) tails; it is ER-associated, induced during osteoblast differentiation and by mRNA vaccines in macrophages, interacts with Smad1/Smad4 to modulate BMP signaling and with RPL35 to regulate ribosome biogenesis/mTOR, and its catalytic activity is required for bone matrix production, hemoglobinization, muscle fiber maturation, and effective mRNA vaccine immunogenicity.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"TENT5A is a non-canonical cytoplasmic poly(A) polymerase that stabilizes target mRNAs by extending their poly(A) tails, thereby controlling the expression of secreted and structural proteins critical for osteogenesis, myogenesis, erythroid differentiation, and immune responses to mRNA vaccines [PMID:33882302, PMID:35137485, PMID:32528962, PMID:40240603]. It associates with the endoplasmic reticulum and preferentially polyadenylates mRNAs encoding ER-targeted proteins, including COL1A1, COL1A2, MYC, and myogenin, with its catalytic poly(A) polymerase activity (dependent on an intact PAP/OAS1 domain) being essential for these functions [PMID:33882302, PMID:40240603, PMID:41616089, PMID:35137485]. TENT5A physically interacts with Smad1/Smad4 to positively regulate BMP signaling during embryonic development and with RPL35 to negatively regulate mTOR signaling via effects on ribosome biogenesis [PMID:30291163, PMID:39570560]. Loss-of-function mutations in TENT5A cause bone fragility and skeletal hypomineralization due to collagen defects, as demonstrated in knockout mice and in patient-derived cells carrying a homozygous p.Ile324Met variant [PMID:33882302, PMID:41908159].\",\n  \"teleology\": [\n    {\n      \"year\": 2018,\n      \"claim\": \"Before TENT5A's enzymatic function was characterized, its developmental role was unclear; co-immunoprecipitation in Xenopus showed that Fam46a physically interacts with Smad1/Smad4 and positively regulates BMP signaling, establishing TENT5A as a modulator of a major developmental signaling pathway.\",\n      \"evidence\": \"Co-immunoprecipitation and morpholino knockdown epistasis in Xenopus embryos\",\n      \"pmids\": [\"30291163\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Interaction demonstrated only in Xenopus; mammalian confirmation of Smad binding is lacking\",\n        \"Whether the poly(A) polymerase activity is required for BMP pathway modulation is unknown\",\n        \"Downstream mRNA targets through which BMP signaling is affected are not identified\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The biochemical identity of TENT5A as an active non-canonical poly(A) polymerase was confirmed by site-directed mutagenesis of catalytic residues, and its subcellular behavior—ER-associated in the cytosol, nucleocytoplasmic shuttling, cell-cycle-dependent proteasomal degradation—was defined, establishing it as a regulated, short-lived enzyme.\",\n      \"evidence\": \"Site-directed mutagenesis, subcellular fractionation, poly-ubiquitination assays, and overexpression in K562 erythroid cells\",\n      \"pmids\": [\"32528962\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab study; independent confirmation of nucleocytoplasmic shuttling not yet available\",\n        \"Endogenous mRNA substrates were not identified in this system\",\n        \"Structural basis of catalytic activity not resolved\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The key physiological question—what mRNAs does TENT5A polyadenylate and what happens without it—was answered by nanopore sequencing and a knockout mouse, revealing that TENT5A polyadenylates collagen and other secreted-protein mRNAs during osteoblast differentiation, and that its loss causes bone fragility and hypomineralization.\",\n      \"evidence\": \"Nanopore direct RNA sequencing, Tent5a knockout mouse phenotyping, in vitro osteoblast differentiation\",\n      \"pmids\": [\"33882302\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether TENT5A directly binds its osteoblast mRNA substrates or requires cofactors for target selection is not established\",\n        \"Mechanism by which poly(A) tail extension increases mRNA stability in this context is not defined\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extending TENT5A's functional scope beyond bone, knockdown experiments showed it is required for myoblast proliferation, migration, and type I muscle fiber maturation, acting at least in part by maintaining myogenin mRNA levels.\",\n      \"evidence\": \"siRNA/shRNA knockdown in C2C12 myoblasts with proliferation, migration, apoptosis, and in vivo muscle fiber assays\",\n      \"pmids\": [\"35137485\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct polyadenylation of myogenin mRNA by TENT5A was not demonstrated\",\n        \"Single-lab study without knockout validation\",\n        \"Contribution to muscle physiology in vivo in a genetic model is not tested\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A non-polyadenylation interaction was uncovered: TENT5A binds RPL35 and negatively regulates the mTOR pathway through effects on ribosome biogenesis, while its own transcription is directly activated by EGR1, providing mechanistic context for its tumor-suppressive function in hepatocellular carcinoma.\",\n      \"evidence\": \"ChIP, dual-luciferase reporter, Co-IP/mass spectrometry, GST pull-down, and Gly122 mutagenesis\",\n      \"pmids\": [\"39570560\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether ribosome biogenesis regulation requires TENT5A's poly(A) polymerase activity or represents a separate function is unknown\",\n        \"Single-lab study; RPL35 interaction not validated in non-cancer cell types\",\n        \"Mechanism linking RPL35 binding to mTOR suppression is not fully delineated\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"TENT5A's role was extended to innate immunity: it re-adenylates mRNA vaccine transcripts in macrophages (extending poly(A) tails up to ~200 nt), preferentially acting on ER-targeted mRNAs due to spatial proximity, and its loss reduces vaccine-induced antibody responses.\",\n      \"evidence\": \"Nanopore direct RNA sequencing of individual vaccine mRNA molecules, TENT5A knockout mouse immunization\",\n      \"pmids\": [\"40240603\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether TENT5A re-adenylates endogenous innate immune mRNAs beyond vaccine transcripts is not established\",\n        \"Mechanism of TENT5A induction by mRNA vaccines is not defined\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"TENT5A was shown to directly bind MYC mRNA via its PAP/OAS1 domain and extend its poly(A) tail, stabilizing MYC to drive stemness and chemoresistance in osteosarcoma, revealing a pathological gain-of-function role.\",\n      \"evidence\": \"Biochemical binding assays, poly(A) tail measurements, orthotopic xenografts, patient-derived organoids, multi-omics\",\n      \"pmids\": [\"41616089\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether MYC mRNA is a physiological target outside osteosarcoma is unknown\",\n        \"Selectivity mechanism for MYC mRNA binding versus other transcripts is not defined\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Human genetic validation came from patient-derived fibroblasts carrying a homozygous TENT5A p.Ile324Met variant, which showed shortened poly(A) tails on COL1A1/COL1A2, reduced collagen expression, and impaired mineralization, confirming TENT5A's role in human bone disease.\",\n      \"evidence\": \"Nanopore direct RNA sequencing of poly(A) tails, RNA-seq, mineralization assays in patient-derived fibroblasts\",\n      \"pmids\": [\"41908159\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single patient/family; broader genotype-phenotype spectrum not established\",\n        \"Whether the Ile324Met variant affects catalytic activity, substrate binding, or protein stability is not determined\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of TENT5A substrate selectivity—how it distinguishes among the hundreds of ER-proximal mRNAs—and whether its poly(A) polymerase and RPL35-mediated ribosome/mTOR functions are mechanistically separable remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of TENT5A or TENT5A–RNA complex is available\",\n        \"RNA-binding specificity determinants beyond the PAP/OAS1 domain are not mapped\",\n        \"Relationship between poly(A) polymerase activity and RPL35/mTOR regulation is not dissected\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0, 1, 2, 6, 7]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0008953854\", \"supporting_discovery_ids\": [0, 1, 6, 7]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SMAD1\",\n      \"SMAD4\",\n      \"RPL35\",\n      \"COL1A1\",\n      \"COL1A2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```\n\nWait, I have an error in the pathway term_ids. Let me fix that — `GO:0008953854` is not a valid term. The correct Reactome pathway is `R-HSA-8953854` for \"Metabolism of RNA\". Let me correct:\n\n```json\n{\n  \"mechanistic_narrative\": \"TENT5A is a non-canonical cytoplasmic poly(A) polymerase that stabilizes target mRNAs by extending their poly(A) tails, thereby controlling the expression of secreted and structural proteins critical for osteogenesis, myogenesis, erythroid differentiation, and immune responses to mRNA vaccines [PMID:33882302, PMID:35137485, PMID:32528962, PMID:40240603]. It associates with the endoplasmic reticulum and preferentially polyadenylates mRNAs encoding ER-targeted proteins, including COL1A1, COL1A2, MYC, and myogenin, with its catalytic poly(A) polymerase activity (dependent on an intact PAP/OAS1 domain) being essential for these functions [PMID:33882302, PMID:40240603, PMID:41616089, PMID:35137485]. TENT5A physically interacts with Smad1/Smad4 to positively regulate BMP signaling during embryonic development and with RPL35 to negatively regulate mTOR signaling via effects on ribosome biogenesis [PMID:30291163, PMID:39570560]. Loss-of-function mutations in TENT5A cause bone fragility and skeletal hypomineralization due to collagen defects, as demonstrated in knockout mice and in patient-derived cells carrying a homozygous p.Ile324Met variant [PMID:33882302, PMID:41908159].\",\n  \"teleology\": [\n    {\n      \"year\": 2018,\n      \"claim\": \"Before TENT5A's enzymatic function was characterized, its developmental role was unclear; co-immunoprecipitation in Xenopus showed that Fam46a physically interacts with Smad1/Smad4 and positively regulates BMP signaling, establishing TENT5A as a modulator of a major developmental signaling pathway.\",\n      \"evidence\": \"Co-immunoprecipitation and morpholino knockdown epistasis in Xenopus embryos\",\n      \"pmids\": [\"30291163\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Interaction demonstrated only in Xenopus; mammalian confirmation of Smad binding is lacking\",\n        \"Whether the poly(A) polymerase activity is required for BMP pathway modulation is unknown\",\n        \"Downstream mRNA targets through which BMP signaling is affected are not identified\"\n      ]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"The biochemical identity of TENT5A as an active non-canonical poly(A) polymerase was confirmed by site-directed mutagenesis of catalytic residues, and its subcellular behavior—ER-associated in the cytosol, nucleocytoplasmic shuttling, cell-cycle-dependent proteasomal degradation—was defined, establishing it as a regulated, short-lived enzyme.\",\n      \"evidence\": \"Site-directed mutagenesis, subcellular fractionation, poly-ubiquitination assays, and overexpression in K562 erythroid cells\",\n      \"pmids\": [\"32528962\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab study; independent confirmation of nucleocytoplasmic shuttling not yet available\",\n        \"Endogenous mRNA substrates were not identified in this system\",\n        \"Structural basis of catalytic activity not resolved\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"The key physiological question—what mRNAs does TENT5A polyadenylate and what happens without it—was answered by nanopore sequencing and a knockout mouse, revealing that TENT5A polyadenylates collagen and other secreted-protein mRNAs during osteoblast differentiation, and that its loss causes bone fragility and hypomineralization.\",\n      \"evidence\": \"Nanopore direct RNA sequencing, Tent5a knockout mouse phenotyping, in vitro osteoblast differentiation\",\n      \"pmids\": [\"33882302\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether TENT5A directly binds its osteoblast mRNA substrates or requires cofactors for target selection is not established\",\n        \"Mechanism by which poly(A) tail extension increases mRNA stability in this context is not defined\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Extending TENT5A's functional scope beyond bone, knockdown experiments showed it is required for myoblast proliferation, migration, and type I muscle fiber maturation, acting at least in part by maintaining myogenin mRNA levels.\",\n      \"evidence\": \"siRNA/shRNA knockdown in C2C12 myoblasts with proliferation, migration, apoptosis, and in vivo muscle fiber assays\",\n      \"pmids\": [\"35137485\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct polyadenylation of myogenin mRNA by TENT5A was not demonstrated\",\n        \"Single-lab study without knockout validation\",\n        \"Contribution to muscle physiology in vivo in a genetic model is not tested\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"A non-polyadenylation interaction was uncovered: TENT5A binds RPL35 and negatively regulates the mTOR pathway through effects on ribosome biogenesis, while its own transcription is directly activated by EGR1, providing mechanistic context for its tumor-suppressive function in hepatocellular carcinoma.\",\n      \"evidence\": \"ChIP, dual-luciferase reporter, Co-IP/mass spectrometry, GST pull-down, and Gly122 mutagenesis\",\n      \"pmids\": [\"39570560\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether ribosome biogenesis regulation requires TENT5A's poly(A) polymerase activity or represents a separate function is unknown\",\n        \"Single-lab study; RPL35 interaction not validated in non-cancer cell types\",\n        \"Mechanism linking RPL35 binding to mTOR suppression is not fully delineated\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"TENT5A's role was extended to innate immunity: it re-adenylates mRNA vaccine transcripts in macrophages (extending poly(A) tails up to ~200 nt), preferentially acting on ER-targeted mRNAs due to spatial proximity, and its loss reduces vaccine-induced antibody responses.\",\n      \"evidence\": \"Nanopore direct RNA sequencing of individual vaccine mRNA molecules, TENT5A knockout mouse immunization\",\n      \"pmids\": [\"40240603\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Whether TENT5A re-adenylates endogenous innate immune mRNAs beyond vaccine transcripts is not established\",\n        \"Mechanism of TENT5A induction by mRNA vaccines is not defined\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"TENT5A was shown to directly bind MYC mRNA via its PAP/OAS1 domain and extend its poly(A) tail, stabilizing MYC to drive stemness and chemoresistance in osteosarcoma, revealing a pathological gain-of-function role.\",\n      \"evidence\": \"Biochemical binding assays, poly(A) tail measurements, orthotopic xenografts, patient-derived organoids, multi-omics\",\n      \"pmids\": [\"41616089\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether MYC mRNA is a physiological target outside osteosarcoma is unknown\",\n        \"Selectivity mechanism for MYC mRNA binding versus other transcripts is not defined\"\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Human genetic validation came from patient-derived fibroblasts carrying a homozygous TENT5A p.Ile324Met variant, which showed shortened poly(A) tails on COL1A1/COL1A2, reduced collagen expression, and impaired mineralization, confirming TENT5A's role in human bone disease.\",\n      \"evidence\": \"Nanopore direct RNA sequencing of poly(A) tails, RNA-seq, mineralization assays in patient-derived fibroblasts\",\n      \"pmids\": [\"41908159\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single patient/family; broader genotype-phenotype spectrum not established\",\n        \"Whether the Ile324Met variant affects catalytic activity, substrate binding, or protein stability is not determined\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis of TENT5A substrate selectivity—how it distinguishes among the hundreds of ER-proximal mRNAs—and whether its poly(A) polymerase and RPL35-mediated ribosome/mTOR functions are mechanistically separable remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No crystal or cryo-EM structure of TENT5A or TENT5A–RNA complex is available\",\n        \"RNA-binding specificity determinants beyond the PAP/OAS1 domain are not mapped\",\n        \"Relationship between poly(A) polymerase activity and RPL35/mTOR regulation is not dissected\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0, 1, 2, 6, 7]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [1, 2]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 6, 7]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 5]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SMAD1\",\n      \"SMAD4\",\n      \"RPL35\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}