{"gene":"TSEN54","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2011,"finding":"TSEN54 encodes a subunit of the tRNA-splicing endonuclease (TSEN) complex responsible for splicing introns from precursor tRNAs; loss-of-function morpholino knockdown of tsen54 in zebrafish causes loss of brain structural definition and increased cell death, a phenotype partially rescued by co-injection of human TSEN54 mRNA, establishing that TSEN54 mutations cause PCH through a loss-of-function mechanism.","method":"Morpholino knockdown in zebrafish, mRNA rescue experiment, N-ethyl-N-nitrosourea (ENU) premature stop-codon mutant zebrafish, cell death assays in brain tissue","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — morpholino knockdown with mRNA rescue (two orthogonal genetic approaches) in a single lab; functional rescue establishes loss-of-function mechanism","pmids":["21273289"],"is_preprint":false},{"year":2011,"finding":"TSEN54 knockdown in zebrafish produces brain phenotypes comparable to those caused by knockdown of mitochondrial arginyl-tRNA synthetase (rars2/RARS2), placing TSEN54 and RARS2 in a common disease pathway that likely involves tRNA processing.","method":"Parallel morpholino knockdown of tsen54 and rars2 in zebrafish with phenotypic comparison","journal":"Human molecular genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method (morpholino phenotypic comparison); pathway placement is inferred from phenotypic similarity without direct epistasis testing","pmids":["21273289"],"is_preprint":false},{"year":2016,"finding":"TSEN54 encodes a subunit of the tRNA-splicing endonuclease complex that catalyzes the identification and cleavage of introns from precursor tRNAs; an AluSx element inserted into intron 8 of TSEN54 contributed to alternative splicing and generation of novel alternative transcripts during primate evolution, demonstrating that the locus produces multiple isoforms.","method":"RT-PCR, RT-qPCR, genomic PCR and sequencing across multiple primate species and human tissues","journal":"International journal of genomics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, RT-PCR/sequencing only; documents alternative transcripts but does not functionally characterize their protein products","pmids":["28083540"],"is_preprint":false},{"year":2019,"finding":"A missense variant in canine TSEN54 (p.Gly124Asp, orthologous to the human gene) causes hereditary leukodystrophy with severe reduction of myelin formation in Standard Schnauzers, extending the known genotype-phenotype spectrum of TSEN54 loss-of-function to hypomyelination in addition to pontocerebellar hypoplasia.","method":"Linkage analysis, homozygosity mapping, whole-genome sequencing, genotype-phenotype association across ~1000 dogs, histopathology","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — whole-genome sequencing plus perfect genotype-phenotype segregation across large cohort; single lab but multiple orthogonal methods","pmids":["31584937"],"is_preprint":false}],"current_model":"TSEN54 encodes a subunit of the heterotetrameric tRNA-splicing endonuclease (TSEN) complex that identifies and cleaves introns from precursor tRNAs; loss-of-function mutations cause increased neuronal cell death (established by zebrafish morpholino knockdown with mRNA rescue), and the protein shares a common tRNA-processing disease pathway with RARS2, with pathogenic variants producing a spectrum of neurodevelopmental phenotypes including pontocerebellar hypoplasia and leukodystrophy."},"narrative":{"mechanistic_narrative":"TSEN54 encodes a subunit of the tRNA-splicing endonuclease (TSEN) complex that identifies and cleaves introns from precursor tRNAs [PMID:21273289]. Loss-of-function disrupts this tRNA-processing activity: morpholino knockdown of tsen54 in zebrafish causes loss of brain structural definition and increased neuronal cell death, a phenotype partially rescued by human TSEN54 mRNA, establishing that pathogenic TSEN54 mutations act through loss of function to cause pontocerebellar hypoplasia [PMID:21273289]. The genotype-phenotype spectrum extends beyond pontocerebellar hypoplasia to hypomyelinating leukodystrophy, as shown by a missense variant (p.Gly124Asp) causing hereditary leukodystrophy with severe myelin reduction in dogs [PMID:31584937]. Beyond its role as a tRNA endonuclease subunit and the disease links established in these models, no further biochemical detail of TSEN54 catalytic mechanism or complex assembly has been characterized in the available corpus.","teleology":[{"year":2011,"claim":"Established that TSEN54 functions as a tRNA-splicing endonuclease subunit and that its disease-causing mutations act through loss of function, addressing whether PCH-associated variants are deleterious to gene activity.","evidence":"Morpholino knockdown with human mRNA rescue and ENU stop-codon mutants in zebrafish, with brain cell-death assays","pmids":["21273289"],"confidence":"Medium","gaps":["Does not demonstrate the biochemical endonuclease activity of human TSEN54 directly","Complex assembly and catalytic contribution of TSEN54 not resolved","Mechanism linking impaired tRNA splicing to selective neuronal death unknown"]},{"year":2011,"claim":"Placed TSEN54 in a shared disease pathway with RARS2, addressing whether distinct tRNA-related genes converge on a common neurodevelopmental phenotype.","evidence":"Parallel morpholino knockdown of tsen54 and rars2 in zebrafish with phenotypic comparison","pmids":["21273289"],"confidence":"Low","gaps":["Pathway placement inferred from phenotypic similarity without direct epistasis testing","No molecular evidence the two genes act in the same biochemical pathway","Whether convergence is on tRNA processing specifically is not demonstrated"]},{"year":2016,"claim":"Documented that the TSEN54 locus generates multiple alternative transcripts, addressing transcript diversity and its evolutionary origin in primates.","evidence":"RT-PCR, RT-qPCR, genomic PCR and sequencing across primate species and human tissues","pmids":["28083540"],"confidence":"Low","gaps":["Does not functionally characterize the protein products of alternative transcripts","Functional consequence of the AluSx insertion in intron 8 unknown","No link between isoform usage and disease or tRNA processing"]},{"year":2019,"claim":"Extended the TSEN54 phenotypic spectrum from pontocerebellar hypoplasia to hypomyelinating leukodystrophy, addressing the breadth of disease outcomes from TSEN54 dysfunction.","evidence":"Linkage analysis, homozygosity mapping, whole-genome sequencing and histopathology in a large canine cohort identifying p.Gly124Asp","pmids":["31584937"],"confidence":"Medium","gaps":["Mechanism by which the missense variant impairs myelination not established","Whether the variant disrupts endonuclease activity or complex integrity untested","Human leukodystrophy association not directly demonstrated"]},{"year":null,"claim":"The biochemical mechanism by which TSEN54 contributes to pre-tRNA intron recognition and cleavage, and how impaired tRNA splicing produces selective neuronal and oligodendroglial pathology, remains open.","evidence":"","pmids":[],"confidence":"Low","gaps":["No reconstitution of human TSEN complex activity in the corpus","No structural model of TSEN54 within the complex","Cell-type specificity of disease phenotype unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0]}],"localization":[],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0]}],"complexes":["tRNA-splicing endonuclease (TSEN) complex"],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q7Z6J9","full_name":"tRNA-splicing endonuclease subunit Sen54","aliases":["SEN54 homolog","HsSEN54","tRNA-intron endonuclease Sen54"],"length_aa":526,"mass_kda":58.8,"function":"Non-catalytic subunit of the tRNA-splicing endonuclease complex, a complex responsible for identification and cleavage of the splice sites in pre-tRNA. It cleaves pre-tRNA at the 5' and 3' splice sites to release the intron. The products are an intron and two tRNA half-molecules bearing 2',3' cyclic phosphate and 5'-OH termini. There are no conserved sequences at the splice sites, but the intron is invariably located at the same site in the gene, placing the splice sites an invariant distance from the constant structural features of the tRNA body. The tRNA splicing endonuclease is also involved in mRNA processing via its association with pre-mRNA 3'-end processing factors, establishing a link between pre-tRNA splicing and pre-mRNA 3'-end formation, suggesting that the endonuclease subunits function in multiple RNA-processing events","subcellular_location":"Nucleus; Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/Q7Z6J9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/TSEN54","classification":"Common Essential","n_dependent_lines":1155,"n_total_lines":1208,"dependency_fraction":0.9561258278145696},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TSEN54","total_profiled":1310},"omim":[{"mim_id":"614969","title":"PONTOCEREBELLAR HYPOPLASIA, TYPE 7; PCH7","url":"https://www.omim.org/entry/614969"},{"mim_id":"612389","title":"PONTOCEREBELLAR HYPOPLASIA, TYPE 2B; PCH2B","url":"https://www.omim.org/entry/612389"},{"mim_id":"610204","title":"PONTOCEREBELLAR HYPOPLASIA, TYPE 5; PCH5","url":"https://www.omim.org/entry/610204"},{"mim_id":"608755","title":"tRNA SPLICING ENDONUCLEASE, SUBUNIT 54; TSEN54","url":"https://www.omim.org/entry/608755"},{"mim_id":"608753","title":"tRNA SPLICING ENDONUCLEASE, SUBUNIT 2; TSEN2","url":"https://www.omim.org/entry/608753"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in many","driving_tissues":[],"url":"https://www.proteinatlas.org/search/TSEN54"},"hgnc":{"alias_symbol":["SEN54","SEN54L"],"prev_symbol":[]},"alphafold":{"accession":"Q7Z6J9","domains":[{"cath_id":"3.40.1170.20","chopping":"75-151","consensus_level":"high","plddt":92.0832,"start":75,"end":151},{"cath_id":"-","chopping":"176-180_428-514","consensus_level":"high","plddt":87.1666,"start":176,"end":514}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z6J9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z6J9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q7Z6J9-F1-predicted_aligned_error_v6.png","plddt_mean":72.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TSEN54","jax_strain_url":"https://www.jax.org/strain/search?query=TSEN54"},"sequence":{"accession":"Q7Z6J9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q7Z6J9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q7Z6J9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q7Z6J9"}},"corpus_meta":[{"pmid":"21273289","id":"PMC_21273289","title":"Impairment of the tRNA-splicing endonuclease subunit 54 (tsen54) gene causes neurological abnormalities and larval death in zebrafish models of pontocerebellar hypoplasia.","date":"2011","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21273289","citation_count":50,"is_preprint":false},{"pmid":"21368912","id":"PMC_21368912","title":"TSEN54 mutations cause pontocerebellar hypoplasia type 5.","date":"2011","source":"European journal of human genetics : EJHG","url":"https://pubmed.ncbi.nlm.nih.gov/21368912","citation_count":39,"is_preprint":false},{"pmid":"29410950","id":"PMC_29410950","title":"TSEN54 Gene-Related Pontocerebellar Hypoplasia Type 2 Could Mimic Dyskinetic Cerebral Palsy with Severe Psychomotor Retardation.","date":"2018","source":"Frontiers in pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/29410950","citation_count":38,"is_preprint":false},{"pmid":"23307886","id":"PMC_23307886","title":"Novel mutations in TSEN54 in pontocerebellar hypoplasia type 2.","date":"2013","source":"Journal of child neurology","url":"https://pubmed.ncbi.nlm.nih.gov/23307886","citation_count":12,"is_preprint":false},{"pmid":"31584937","id":"PMC_31584937","title":"TSEN54 missense variant in Standard Schnauzers with leukodystrophy.","date":"2019","source":"PLoS genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31584937","citation_count":10,"is_preprint":false},{"pmid":"26701950","id":"PMC_26701950","title":"TSEN54 gene-related pontocerebellar hypoplasia type 2 presenting with exaggerated startle response: report of two cases in a family.","date":"2015","source":"The Turkish journal of pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/26701950","citation_count":10,"is_preprint":false},{"pmid":"24938831","id":"PMC_24938831","title":"A familial late‑onset hereditary ataxia mimicking pontocerebellar hypoplasia caused by a novel TSEN54 mutation.","date":"2014","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/24938831","citation_count":6,"is_preprint":false},{"pmid":"28083540","id":"PMC_28083540","title":"Identification of Alternative Variants and Insertion of the Novel Polymorphic AluYl17 in TSEN54 Gene during Primate Evolution.","date":"2016","source":"International journal of genomics","url":"https://pubmed.ncbi.nlm.nih.gov/28083540","citation_count":5,"is_preprint":false},{"pmid":"21824568","id":"PMC_21824568","title":"Novel TSEN54 mutation causing pontocerebellar hypoplasia type 4.","date":"2011","source":"Pediatric neurology","url":"https://pubmed.ncbi.nlm.nih.gov/21824568","citation_count":5,"is_preprint":false},{"pmid":"35962274","id":"PMC_35962274","title":"TSEN54 Gene-Related Pontocerebellar-Hypoplasia and Role of Prenatal MR Imaging: Besides the Common Posterior Fossa Cystic Malformations.","date":"2022","source":"Cerebellum (London, England)","url":"https://pubmed.ncbi.nlm.nih.gov/35962274","citation_count":4,"is_preprint":false},{"pmid":"39400946","id":"PMC_39400946","title":"Exome Sequencing of Consanguineous Pashtun Families With Familial Epilepsy Reveals Causative and Candidate Variants in TSEN54, MOCS2, and OPHN1.","date":"2024","source":"Clinical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/39400946","citation_count":1,"is_preprint":false},{"pmid":"39634246","id":"PMC_39634246","title":"Screening for TSEN54 Variants in Egyptian Patients with Pontocerebellar Malformations.","date":"2024","source":"Molecular syndromology","url":"https://pubmed.ncbi.nlm.nih.gov/39634246","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.06.10.25328274","title":"Diagnostic clues and pitfalls in pontocerebellar hypoplasia type 2A","date":"2025-06-11","source":"bioRxiv","url":"https://doi.org/10.1101/2025.06.10.25328274","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.06.23.24307757","title":"Growth charts for pontocerebellar hypoplasia type 2A","date":"2024-06-24","source":"bioRxiv","url":"https://doi.org/10.1101/2024.06.23.24307757","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8552,"output_tokens":1110,"usd":0.021153,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7698,"output_tokens":1861,"usd":0.042507,"stage2_stop_reason":"end_turn"},"total_usd":0.06366,"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\": 2011,\n      \"finding\": \"TSEN54 encodes a subunit of the tRNA-splicing endonuclease (TSEN) complex responsible for splicing introns from precursor tRNAs; loss-of-function morpholino knockdown of tsen54 in zebrafish causes loss of brain structural definition and increased cell death, a phenotype partially rescued by co-injection of human TSEN54 mRNA, establishing that TSEN54 mutations cause PCH through a loss-of-function mechanism.\",\n      \"method\": \"Morpholino knockdown in zebrafish, mRNA rescue experiment, N-ethyl-N-nitrosourea (ENU) premature stop-codon mutant zebrafish, cell death assays in brain tissue\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — morpholino knockdown with mRNA rescue (two orthogonal genetic approaches) in a single lab; functional rescue establishes loss-of-function mechanism\",\n      \"pmids\": [\"21273289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TSEN54 knockdown in zebrafish produces brain phenotypes comparable to those caused by knockdown of mitochondrial arginyl-tRNA synthetase (rars2/RARS2), placing TSEN54 and RARS2 in a common disease pathway that likely involves tRNA processing.\",\n      \"method\": \"Parallel morpholino knockdown of tsen54 and rars2 in zebrafish with phenotypic comparison\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method (morpholino phenotypic comparison); pathway placement is inferred from phenotypic similarity without direct epistasis testing\",\n      \"pmids\": [\"21273289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TSEN54 encodes a subunit of the tRNA-splicing endonuclease complex that catalyzes the identification and cleavage of introns from precursor tRNAs; an AluSx element inserted into intron 8 of TSEN54 contributed to alternative splicing and generation of novel alternative transcripts during primate evolution, demonstrating that the locus produces multiple isoforms.\",\n      \"method\": \"RT-PCR, RT-qPCR, genomic PCR and sequencing across multiple primate species and human tissues\",\n      \"journal\": \"International journal of genomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, RT-PCR/sequencing only; documents alternative transcripts but does not functionally characterize their protein products\",\n      \"pmids\": [\"28083540\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A missense variant in canine TSEN54 (p.Gly124Asp, orthologous to the human gene) causes hereditary leukodystrophy with severe reduction of myelin formation in Standard Schnauzers, extending the known genotype-phenotype spectrum of TSEN54 loss-of-function to hypomyelination in addition to pontocerebellar hypoplasia.\",\n      \"method\": \"Linkage analysis, homozygosity mapping, whole-genome sequencing, genotype-phenotype association across ~1000 dogs, histopathology\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — whole-genome sequencing plus perfect genotype-phenotype segregation across large cohort; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"31584937\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TSEN54 encodes a subunit of the heterotetrameric tRNA-splicing endonuclease (TSEN) complex that identifies and cleaves introns from precursor tRNAs; loss-of-function mutations cause increased neuronal cell death (established by zebrafish morpholino knockdown with mRNA rescue), and the protein shares a common tRNA-processing disease pathway with RARS2, with pathogenic variants producing a spectrum of neurodevelopmental phenotypes including pontocerebellar hypoplasia and leukodystrophy.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TSEN54 encodes a subunit of the tRNA-splicing endonuclease (TSEN) complex that identifies and cleaves introns from precursor tRNAs [#0]. Loss-of-function disrupts this tRNA-processing activity: morpholino knockdown of tsen54 in zebrafish causes loss of brain structural definition and increased neuronal cell death, a phenotype partially rescued by human TSEN54 mRNA, establishing that pathogenic TSEN54 mutations act through loss of function to cause pontocerebellar hypoplasia [#0]. The genotype-phenotype spectrum extends beyond pontocerebellar hypoplasia to hypomyelinating leukodystrophy, as shown by a missense variant (p.Gly124Asp) causing hereditary leukodystrophy with severe myelin reduction in dogs [#3]. Beyond its role as a tRNA endonuclease subunit and the disease links established in these models, no further biochemical detail of TSEN54 catalytic mechanism or complex assembly has been characterized in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2011,\n      \"claim\": \"Established that TSEN54 functions as a tRNA-splicing endonuclease subunit and that its disease-causing mutations act through loss of function, addressing whether PCH-associated variants are deleterious to gene activity.\",\n      \"evidence\": \"Morpholino knockdown with human mRNA rescue and ENU stop-codon mutants in zebrafish, with brain cell-death assays\",\n      \"pmids\": [\"21273289\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"Does not demonstrate the biochemical endonuclease activity of human TSEN54 directly\",\n        \"Complex assembly and catalytic contribution of TSEN54 not resolved\",\n        \"Mechanism linking impaired tRNA splicing to selective neuronal death unknown\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placed TSEN54 in a shared disease pathway with RARS2, addressing whether distinct tRNA-related genes converge on a common neurodevelopmental phenotype.\",\n      \"evidence\": \"Parallel morpholino knockdown of tsen54 and rars2 in zebrafish with phenotypic comparison\",\n      \"pmids\": [\"21273289\"],\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"Pathway placement inferred from phenotypic similarity without direct epistasis testing\",\n        \"No molecular evidence the two genes act in the same biochemical pathway\",\n        \"Whether convergence is on tRNA processing specifically is not demonstrated\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Documented that the TSEN54 locus generates multiple alternative transcripts, addressing transcript diversity and its evolutionary origin in primates.\",\n      \"evidence\": \"RT-PCR, RT-qPCR, genomic PCR and sequencing across primate species and human tissues\",\n      \"pmids\": [\"28083540\"],\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"Does not functionally characterize the protein products of alternative transcripts\",\n        \"Functional consequence of the AluSx insertion in intron 8 unknown\",\n        \"No link between isoform usage and disease or tRNA processing\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended the TSEN54 phenotypic spectrum from pontocerebellar hypoplasia to hypomyelinating leukodystrophy, addressing the breadth of disease outcomes from TSEN54 dysfunction.\",\n      \"evidence\": \"Linkage analysis, homozygosity mapping, whole-genome sequencing and histopathology in a large canine cohort identifying p.Gly124Asp\",\n      \"pmids\": [\"31584937\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"Mechanism by which the missense variant impairs myelination not established\",\n        \"Whether the variant disrupts endonuclease activity or complex integrity untested\",\n        \"Human leukodystrophy association not directly demonstrated\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The biochemical mechanism by which TSEN54 contributes to pre-tRNA intron recognition and cleavage, and how impaired tRNA splicing produces selective neuronal and oligodendroglial pathology, remains open.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\n        \"No reconstitution of human TSEN complex activity in the corpus\",\n        \"No structural model of TSEN54 within the complex\",\n        \"Cell-type specificity of disease phenotype unexplained\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [\"tRNA-splicing endonuclease (TSEN) complex\"],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":2,"faith_total":3,"faith_pct":66.66666666666667}}