{"gene":"CLP1","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2007,"finding":"hClp1 (human CLP1) is an RNA-specific 5'-OH polynucleotide kinase that phosphorylates the 5' end of the 3' tRNA exon during human tRNA splicing, enabling subsequent ligation of both exon halves. It also phosphorylates synthetic siRNAs at the 5' end, licensing them for incorporation into RISC and subsequent target RNA cleavage.","method":"Chromatographic purification of kinase activity from HeLa cells, in vitro RNA kinase assay, siRNA phosphorylation monitoring, RISC assembly/cleavage assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — biochemical purification, in vitro kinase assay with defined substrates, functional RISC incorporation assay; foundational study replicated by subsequent work","pmids":["17495927"],"is_preprint":false},{"year":2008,"finding":"Human CLP1 kinase activity can functionally substitute for the 5'-OH RNA kinase module of yeast/plant tRNA ligases in vivo, demonstrating its role as a tRNA splicing enzyme. Mutations in the kinase active site abolish this tRNA splicing activity. Yeast Clp1, unlike human CLP1, has no detectable RNA kinase activity in vitro.","method":"Complementation of conditional and lethal kinase-defective tRNA ligase mutations in budding yeast by hCLP1 expression; in vitro RNA kinase assay with purified recombinant yClp1; kinase active-site mutagenesis","journal":"RNA","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro kinase assay with mutagenesis, in vivo complementation in yeast, multiple orthogonal methods in one study","pmids":["18648070"],"is_preprint":false},{"year":2013,"finding":"Loss of CLP1 kinase activity in mice (kinase-dead Clp1 K/K) causes progressive spinal motor neuron loss. Mechanistically, loss of CLP1 activity results in accumulation of small RNA fragments derived from aberrant processing of tyrosine pre-tRNA. These tRNA fragments sensitize cells to oxidative-stress-induced p53 activation and p53-dependent cell death. Genetic inactivation of p53 rescues motor neuron loss, muscle denervation, and respiratory failure in Clp1 K/K mice.","method":"Kinase-dead knock-in mouse model; small RNA sequencing; p53 genetic knockout epistasis; neuromuscular junction analysis; motor function assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — kinase-dead knock-in mouse, small RNA sequencing, genetic epistasis with p53 rescue, multiple orthogonal methods","pmids":["23474986"],"is_preprint":false},{"year":2014,"finding":"A human CLP1 missense mutation (p.R140H) causes loss of CLP1 interaction with the tRNA splicing endonuclease (TSEN) complex, largely reduced pre-tRNA cleavage activity, and accumulation of linear tRNA introns. CLP1 kinase-dead mice also display microcephaly and reduced cortical brain volume due to enhanced cell death of neuronal progenitors.","method":"Patient genome sequencing; co-immunoprecipitation of CLP1-TSEN complex; pre-tRNA cleavage assay; kinase-dead mouse histology and neuronal progenitor analysis","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct biochemical assay of TSEN complex interaction and pre-tRNA cleavage, kinase-dead mouse model, replicated by companion paper (PMID:24766810)","pmids":["24766809"],"is_preprint":false},{"year":2014,"finding":"The CLP1 founder mutation (R140H) causes defective CLP1 kinase activity and destabilization of the TSEN complex, resulting in impaired pre-tRNA cleavage. Patient-derived induced neurons display depletion of mature tRNAs and accumulation of unspliced pre-tRNAs. Transfection of partially processed tRNA fragments into patient cells exacerbates oxidative stress-induced reduction in cell survival.","method":"CLP1 kinase assay; TSEN complex co-immunoprecipitation/stability assay; zebrafish germline clp1 null rescue with wild-type vs. mutant human CLP1; tRNA northern blot from patient-derived induced neurons; tRNA fragment transfection + oxidative stress survival assay","journal":"Cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro kinase assay, co-IP of TSEN complex, zebrafish rescue experiments, patient cell functional assays; multiple orthogonal methods","pmids":["24766810"],"is_preprint":false},{"year":2014,"finding":"Crystal structures of C. elegans Clp1 (ceClp1) in nucleotide- and RNA-bound states define the RNA specificity mechanism: an RNA binding motif termed 'clasp' confers RNA substrate specificity, and a conformational switch involving the essential Walker A lysine (Lys127) regulates enzymatic activity. This switch is proposed as a broadly conserved mechanistic feature of P-loop proteins.","method":"X-ray crystallography; biochemical kinase assays; active-site mutagenesis","journal":"Molecular Cell","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structures in multiple reaction states combined with biochemical assays and mutagenesis in a single rigorous study","pmids":["24813946"],"is_preprint":false},{"year":2006,"finding":"Crystal structure of yeast Clp1 in ternary complex with ATP and the Clp1-binding region of Pcf11 reveals three domains (N-terminal beta sandwich, central ATP-binding, C-terminal alpha/beta-fold). The nucleotide-binding site resembles SIMIBI-class ATPases but does not hydrolyze ATP. Three highly conserved Pcf11 residues mediate most protein-protein contacts at the central domain.","method":"X-ray crystallography (ternary complex structure)","journal":"Nucleic Acids Research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure at atomic resolution with identification of binding interface; single lab but high-quality structural method","pmids":["17151076"],"is_preprint":false},{"year":2011,"finding":"Yeast Clp1 interacts with CPF (Cleavage and Polyadenylation Factor) through its N-terminal and central domains, providing cross-factor connections in the mRNA 3'-processing complex. Mutations in the conserved ATP-binding site that prevent ATP binding disrupt the Clp1-Pcf11 interaction (rather than ATP binding per se). Mutations in Pcf11 that disrupt Clp1 contact cause defects in 3'-end processing and transcription termination.","method":"Yeast two-hybrid; co-immunoprecipitation; in vitro reconstitution of mutant CFIA; coupled in vitro transcription/3'-end processing assays; growth assays","journal":"Nucleic Acids Research","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reciprocal interaction mapping, in vitro processing reconstitution, mutagenesis, confirmed by companion paper (PMID:22216186)","pmids":["21993299"],"is_preprint":false},{"year":2011,"finding":"Yeast Clp1 is required to assemble recombinant CF IA; depletion of Clp1 in yeast causes defective mRNA 3'-end formation and RNA Pol II transcription termination. The P-loop (ATP-binding) motif of Clp1 plays a structural role in CF IA organization, with ATP binding contributing to CF IA assembly and cross-factor interactions with CPF component Ysh1.","method":"Yeast Clp1 depletion; in vitro transcription/3'-end processing complementation assay; P-loop mutagenesis; recombinant CF IA reconstitution; interaction assays with CPF subunits","journal":"PLoS ONE","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro reconstitution, mutagenesis, depletion phenotypes, multiple orthogonal methods; confirmed by companion paper (PMID:21993299)","pmids":["22216186"],"is_preprint":false},{"year":2011,"finding":"Yeast Clp1 depletion abolishes RNA Pol II transcription termination. Clp1 is essential for CF IA assembly and transmits conformational changes to RNA Pol II through Pcf11 to couple transcription termination with 3'-end processing.","method":"Clp1 depletion in yeast; ChIP analysis of Rna15 and Pcf11 at gene 3'-ends; ATP-binding domain and Pcf11-binding region double mutant analysis; 3'-end processing assays","journal":"Nucleic Acids Research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ChIP, depletion experiments, mutagenesis, multiple orthogonal methods in one study","pmids":["21993300"],"is_preprint":false},{"year":2020,"finding":"CLP1 R140H mutation in mouse models of PCH10 dysregulates products of intron-containing tRNA genes (pre-tRNAs, introns, and certain tRNA fragments up-regulated; other fragments down-regulated) without affecting mature tRNA levels. Additionally, CLP1 mutation shifts poly(A) site usage from proximal to distal sites in spinal cord, particularly in short and closely spaced genes, consistent with impaired mRNA 3' processing.","method":"Knock-in mouse models (homozygous R140H and compound heterozygous); tRNA gene product profiling; poly(A) site usage sequencing; gene expression analysis in spinal cord","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — two independent mouse models, tRNA profiling, poly(A) sequencing, multiple orthogonal methods in one study","pmids":["34548404"],"is_preprint":false},{"year":2020,"finding":"CLP1 is the main RNA kinase phosphorylating the 5' end of siRNAs in mouse cells; NOL9 (a related RNA kinase) shows no apparent RNA kinase activity in mouse cells or with recombinant protein, and NOL9 overexpression does not rescue reduced siRNA efficiency in CLP1 kinase-dead cells.","method":"siRNA efficiency assay in Clp1 K/K cells; recombinant murine NOL9 in vitro RNA kinase assay; NOL9 overexpression rescue experiment","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay for NOL9, siRNA functional assay in kinase-dead cells, single lab","pmids":["32081435"],"is_preprint":false},{"year":2021,"finding":"CLP1 R140H mutation causes intracellular accumulation of both isoleucine pre-tRNA intron fragments (Ile-introns) and 5' tRNA fragments derived from tyrosine pre-tRNAs in knock-in mice, suggesting two types of aberrant RNA fragments may cooperatively or independently contribute to PCH10 pathogenesis.","method":"CLP1 R140H knock-in mouse generation; RNA fragment analysis by northern blot/sequencing; motor neuron loss quantification","journal":"Biochemical and Biophysical Research Communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knock-in mouse model with RNA fragment profiling; single lab, extends prior findings","pmids":["34273619"],"is_preprint":false},{"year":2020,"finding":"CLP1 promotes 3'-UTR shortening associated with higher transcript stability and expression of Aire-sensitive genes in thymic medullary epithelial cells, representing a post-transcriptional level of control via the 3'-end processing complex.","method":"RNAi screen; lentigenic mouse model; 3'-end sequencing; transcript stability assays","journal":"eLife","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi knockdown combined with in vivo mouse model, 3'-end profiling; single lab","pmids":["32338592"],"is_preprint":false},{"year":2021,"finding":"In Drosophila, nuclear Cbc (the CLP1 ortholog) is required to promote meiosis entry in the testis. Cbc physically and/or genetically interacts with Tsen54 (the C-terminal half of Tsen54 is necessary and sufficient for binding) and TER94 (VCP ortholog) in this process. Mammalian CLP1 can rescue Drosophila fertility defects, demonstrating functional conservation.","method":"Genetic manipulation in Drosophila testis; co-immunoprecipitation; domain mapping of Tsen54-Cbc interaction; subcellular localization assay; mammalian CLP1 rescue of Drosophila fertility","journal":"Human Molecular Genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis, co-IP, domain mapping, cross-species rescue; single lab","pmids":["33864361"],"is_preprint":false},{"year":1996,"finding":"The HEAB gene (human CLP1 alias) encodes a 425-amino acid protein containing an ATP/GTP-binding motif with homology to the ATP-binding transporter superfamily or GTP-binding proteins. It is expressed ubiquitously, with highest expression in testis and skeletal muscle.","method":"cDNA cloning; Northern blot; sequence analysis","journal":"Blood","confidence":"Low","confidence_rationale":"Tier 3 / Weak — sequence/expression characterization only; no functional mechanistic experiment on the protein","pmids":["8896421"],"is_preprint":false}],"current_model":"CLP1 (hClp1/HEAB) is an RNA-specific 5'-OH polynucleotide kinase that functions as a structural and catalytic subunit of two major RNA processing machineries: the tRNA splicing endonuclease (TSEN) complex, where its kinase activity phosphorylates the 5' end of the 3' tRNA exon to enable exon ligation and is required for pre-tRNA cleavage, and the mRNA 3'-end cleavage/polyadenylation complex (CF IA), where it bridges CF IA and CPF through its N-terminal and ATP-binding domains and is essential for CF IA assembly, poly(A) site selection, and RNA Pol II transcription termination; loss of its kinase activity causes accumulation of aberrant tRNA-derived fragments (especially from tyrosine and isoleucine pre-tRNAs) that sensitize neurons to oxidative-stress-induced p53-dependent cell death, underlying progressive motor neuron loss and the human neurodegenerative disease pontocerebellar hypoplasia type 10 (PCH10)."},"narrative":{"mechanistic_narrative":"CLP1 is an RNA-specific 5'-OH polynucleotide kinase that serves as a shared catalytic and structural component of two RNA processing machineries: the tRNA splicing endonuclease (TSEN) complex and the mRNA 3'-end cleavage/polyadenylation apparatus [PMID:17495927, PMID:24766809, PMID:21993299]. In tRNA splicing, CLP1 phosphorylates the 5' end of the 3' tRNA exon to license exon ligation, and it can also phosphorylate synthetic siRNAs to enable their incorporation into RISC [PMID:17495927]; its kinase activity is sufficient to substitute for the kinase module of yeast/plant tRNA ligases in vivo, while yeast Clp1 lacks detectable kinase activity [PMID:18648070]. Structural work defines a three-domain architecture (N-terminal β-sandwich, central SIMIBI-like ATP-binding domain, C-terminal α/β fold) in which an RNA-binding 'clasp' motif confers substrate specificity and a Walker A lysine governs a catalytic conformational switch [PMID:24813946, PMID:17151076]. CLP1 associates with the TSEN complex to support pre-tRNA cleavage [PMID:24766809, PMID:24766810], and within CF IA it bridges to the cleavage and polyadenylation factor through its N-terminal and ATP-binding domains, where ATP binding is required not for hydrolysis but for the Clp1–Pcf11 interaction and CF IA assembly that drives poly(A) site selection and RNA Pol II transcription termination [PMID:17151076, PMID:21993299, PMID:22216186, PMID:21993300]. Loss of CLP1 kinase activity uncouples these functions pathologically: aberrant tRNA-derived fragments (from tyrosine and isoleucine pre-tRNAs) accumulate and sensitize neurons to oxidative-stress-induced p53-dependent death, with p53 deletion rescuing motor neuron loss in kinase-dead mice [PMID:23474986, PMID:34273619]. The human CLP1 p.R140H mutation destabilizes CLP1–TSEN association, impairs pre-tRNA cleavage, and shifts poly(A) site usage, causing the neurodegenerative disease pontocerebellar hypoplasia type 10 [PMID:24766809, PMID:24766810, PMID:34548404].","teleology":[{"year":2007,"claim":"Established CLP1's core biochemical identity by showing it is the long-sought 5'-OH RNA kinase that phosphorylates the 3' tRNA exon to permit ligation, also acting on siRNAs for RISC loading.","evidence":"Chromatographic purification of kinase activity from HeLa cells with in vitro RNA kinase and RISC assembly assays","pmids":["17495927"],"confidence":"High","gaps":["Did not resolve the structural basis of RNA specificity","Did not establish the physiological consequence of kinase loss in an organism"]},{"year":2008,"claim":"Demonstrated that human CLP1 kinase activity is functionally a tRNA splicing enzyme and that this activity is species-divergent, since yeast Clp1 has none.","evidence":"In vivo complementation of kinase-defective yeast tRNA ligase mutants by hCLP1, recombinant yClp1 kinase assay, active-site mutagenesis","pmids":["18648070"],"confidence":"High","gaps":["Did not explain why yeast retains a kinase-dead Clp1","Did not map the kinase to a complex in human cells"]},{"year":2006,"claim":"Defined CLP1's three-domain architecture and its non-hydrolytic, SIMIBI-like nucleotide-binding site, and identified the Pcf11 binding interface, revealing its scaffolding role in 3'-end processing.","evidence":"X-ray crystallography of yeast Clp1 in ternary complex with ATP and the Pcf11 Clp1-binding region","pmids":["17151076"],"confidence":"High","gaps":["Did not address human CLP1 kinase mechanism","Structure was of the kinase-inactive yeast ortholog"]},{"year":2011,"claim":"Resolved CLP1's structural role in mRNA 3'-end processing by showing it bridges CF IA to CPF, requires ATP binding (not hydrolysis) for the Pcf11 interaction, and is essential for CF IA assembly and Pol II transcription termination.","evidence":"Yeast two-hybrid, co-IP, in vitro CF IA reconstitution, P-loop mutagenesis, ChIP, and depletion phenotypes across three companion studies","pmids":["21993299","22216186","21993300"],"confidence":"High","gaps":["Performed in yeast where Clp1 lacks kinase activity, leaving the human 3'-processing role inferred","Did not connect 3'-processing function to disease"]},{"year":2013,"claim":"Linked CLP1 kinase loss to a disease-relevant mechanism by showing kinase-dead mice accumulate aberrant tyrosine pre-tRNA fragments that drive oxidative-stress-induced p53-dependent motor neuron death.","evidence":"Kinase-dead knock-in mouse, small RNA sequencing, p53 knockout epistasis rescue, neuromuscular analysis","pmids":["23474986"],"confidence":"High","gaps":["Did not define how tRNA fragments activate p53","Did not establish the human genetic link"]},{"year":2014,"claim":"Identified CLP1 p.R140H as a human disease mutation causing pontocerebellar hypoplasia by disrupting TSEN complex association and pre-tRNA cleavage, with neuronal and oxidative-stress phenotypes recapitulated across mice, zebrafish, and patient cells.","evidence":"Patient genome sequencing, TSEN co-IP/stability assays, pre-tRNA cleavage assays, zebrafish null rescue, patient-derived induced neurons, kinase-dead mouse histology","pmids":["24766809","24766810"],"confidence":"High","gaps":["Did not fully separate the TSEN/tRNA defect from the 3'-processing defect in disease","Mechanism of progenitor cell death not molecularly resolved"]},{"year":2014,"claim":"Established the structural mechanism of CLP1 RNA specificity and catalytic regulation, identifying the 'clasp' RNA-binding motif and a Walker A lysine conformational switch.","evidence":"X-ray crystallography of C. elegans Clp1 in nucleotide- and RNA-bound states with biochemical kinase assays and mutagenesis","pmids":["24813946"],"confidence":"High","gaps":["Structures were of the C. elegans ortholog","Did not connect the switch to human disease mutations"]},{"year":2020,"claim":"Refined the disease model by showing CLP1 R140H dysregulates intron-containing tRNA gene products and shifts poly(A) site usage, implicating both tRNA and mRNA 3'-processing defects in PCH10.","evidence":"Two independent knock-in mouse models with tRNA gene product profiling and poly(A) site sequencing in spinal cord","pmids":["34548404"],"confidence":"High","gaps":["Did not determine relative contribution of tRNA versus poly(A) defects to neurodegeneration","Causality of poly(A) shifts for phenotype not established"]},{"year":2020,"claim":"Clarified CLP1 as the dominant cellular siRNA 5'-kinase by showing the related kinase NOL9 cannot substitute for it.","evidence":"siRNA efficiency assays in Clp1 kinase-dead cells, recombinant NOL9 kinase assays, and NOL9 overexpression rescue attempts","pmids":["32081435"],"confidence":"Medium","gaps":["Single-lab study","Did not address whether other kinases compensate in vivo"]},{"year":2020,"claim":"Extended CLP1's mRNA 3'-processing role to immune tolerance by showing it promotes 3'-UTR shortening that stabilizes Aire-sensitive transcripts in thymic medullary epithelial cells.","evidence":"RNAi screen, lentigenic mouse model, 3'-end sequencing, transcript stability assays","pmids":["32338592"],"confidence":"Medium","gaps":["Single-lab study","Mechanistic link between CLP1 and specific poly(A) site choice not resolved"]},{"year":2021,"claim":"Broadened the spectrum of pathogenic RNA species in PCH10 by showing R140H mice accumulate both isoleucine pre-tRNA intron fragments and tyrosine-derived 5' tRNA fragments.","evidence":"R140H knock-in mouse with RNA fragment profiling and motor neuron loss quantification","pmids":["34273619"],"confidence":"Medium","gaps":["Did not determine whether the two fragment types act cooperatively or independently","Single-lab study"]},{"year":2021,"claim":"Revealed a conserved developmental role for CLP1 in promoting meiosis entry through interactions with TSEN54 and the VCP ortholog, with cross-species functional rescue.","evidence":"Drosophila testis genetics, co-IP, Tsen54-Cbc domain mapping, localization, and mammalian CLP1 rescue of fly fertility","pmids":["33864361"],"confidence":"Medium","gaps":["Performed in Drosophila","Mechanism connecting tRNA processing to meiosis entry unresolved"]},{"year":null,"claim":"How CLP1 partitions its kinase activity and scaffolding between TSEN-mediated tRNA splicing and CF IA-mediated mRNA 3'-end processing, and how the relative loss of each function determines tissue-specific neurodegeneration, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of human CLP1 within either intact human complex","Quantitative contribution of tRNA-fragment toxicity versus poly(A)/3'-processing defects to PCH10 undefined","Molecular pathway connecting tRNA fragments to p53 activation not identified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[0,1,5]},{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[0,1]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,5]},{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[6,7,8]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[7,8]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[14]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,3,4]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[7,8,9]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,4,10]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[2]}],"complexes":["TSEN complex","CF IA"],"partners":["TSEN54","PCF11","YSH1","NOL9","VCP"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q92989","full_name":"Polyribonucleotide 5'-hydroxyl-kinase Clp1","aliases":["Polyadenylation factor Clp1","Polynucleotide kinase Clp1","Pre-mRNA cleavage complex II protein Clp1"],"length_aa":425,"mass_kda":47.6,"function":"Polynucleotide kinase that can phosphorylate the 5'-hydroxyl groups of double-stranded RNA (dsRNA), single-stranded RNA (ssRNA), double-stranded DNA (dsDNA) and double-stranded DNA:RNA hybrids. dsRNA is phosphorylated more efficiently than dsDNA, and the RNA component of a DNA:RNA hybrid is phosphorylated more efficiently than the DNA component. Plays a key role in both tRNA splicing and mRNA 3'-end formation. Component of the tRNA splicing endonuclease complex: phosphorylates the 5'-terminus of the tRNA 3'-exon during tRNA splicing; this phosphorylation event is a prerequisite for the subsequent ligation of the two exon halves and the production of a mature tRNA (PubMed:24766809, PubMed:24766810). Its role in tRNA splicing and maturation is required for cerebellar development (PubMed:24766809, PubMed:24766810). Component of the pre-mRNA cleavage complex II (CF-II), which seems to be required for mRNA 3'-end formation. Also phosphorylates the 5'-terminus of exogenously introduced short interfering RNAs (siRNAs), which is a necessary prerequisite for their incorporation into the RNA-induced silencing complex (RISC). However, endogenous siRNAs and microRNAs (miRNAs) that are produced by the cleavage of dsRNA precursors by DICER1 already contain a 5'-phosphate group, so this protein may be dispensible for normal RNA-mediated gene silencing","subcellular_location":"Nucleus","url":"https://www.uniprot.org/uniprotkb/Q92989/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/CLP1","classification":"Common Essential","n_dependent_lines":1207,"n_total_lines":1208,"dependency_fraction":0.9991721854304636},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CLP1","total_profiled":1310},"omim":[{"mim_id":"620304","title":"NUCLEOLAR PROTEIN 9; NOL9","url":"https://www.omim.org/entry/620304"},{"mim_id":"615803","title":"PONTOCEREBELLAR HYPOPLASIA, TYPE 10; PCH10","url":"https://www.omim.org/entry/615803"},{"mim_id":"614287","title":"OFC1 CANDIDATE GENE 1; OFCC1","url":"https://www.omim.org/entry/614287"},{"mim_id":"608876","title":"PCF11 CLEAVAGE AND POLYADENYLATION FACTOR SUBUNIT; PCF11","url":"https://www.omim.org/entry/608876"},{"mim_id":"608757","title":"CLEAVAGE FACTOR POLYNUCLEOTIDE KINASE SUBUNIT 1; CLP1","url":"https://www.omim.org/entry/608757"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoplasm","reliability":"Supported"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/CLP1"},"hgnc":{"alias_symbol":["HEAB","hClp1"],"prev_symbol":[]},"alphafold":{"accession":"Q92989","domains":[{"cath_id":"2.60.120.1030","chopping":"11-84","consensus_level":"high","plddt":96.0661,"start":11,"end":84},{"cath_id":"3.40.50.300","chopping":"88-278","consensus_level":"high","plddt":97.4315,"start":88,"end":278},{"cath_id":"2.40.30.330","chopping":"294-335_344-419","consensus_level":"high","plddt":92.2856,"start":294,"end":419}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92989","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q92989-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q92989-F1-predicted_aligned_error_v6.png","plddt_mean":93.81},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CLP1","jax_strain_url":"https://www.jax.org/strain/search?query=CLP1"},"sequence":{"accession":"Q92989","fasta_url":"https://rest.uniprot.org/uniprotkb/Q92989.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q92989/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92989"}},"corpus_meta":[{"pmid":"24766810","id":"PMC_24766810","title":"CLP1 founder mutation links tRNA splicing and maturation to cerebellar development and neurodegeneration.","date":"2014","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/24766810","citation_count":227,"is_preprint":false},{"pmid":"23474986","id":"PMC_23474986","title":"CLP1 links tRNA metabolism to progressive motor-neuron loss.","date":"2013","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/23474986","citation_count":211,"is_preprint":false},{"pmid":"24766809","id":"PMC_24766809","title":"Human CLP1 mutations alter tRNA biogenesis, affecting both peripheral and central nervous system function.","date":"2014","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/24766809","citation_count":181,"is_preprint":false},{"pmid":"17495927","id":"PMC_17495927","title":"The human RNA kinase hClp1 is active on 3' transfer RNA exons and short interfering RNAs.","date":"2007","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/17495927","citation_count":180,"is_preprint":false},{"pmid":"11564734","id":"PMC_11564734","title":"The membrane-type collectin CL-P1 is a scavenger receptor on vascular endothelial cells.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11564734","citation_count":173,"is_preprint":false},{"pmid":"18378776","id":"PMC_18378776","title":"The Clp1/Cdc14 phosphatase contributes to the robustness of cytokinesis by association with anillin-related Mid1.","date":"2008","source":"The Journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/18378776","citation_count":83,"is_preprint":false},{"pmid":"16920779","id":"PMC_16920779","title":"The Clp1 protein is required for clamp formation and pathogenic development of Ustilago maydis.","date":"2006","source":"The Plant 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It also phosphorylates synthetic siRNAs at the 5' end, licensing them for incorporation into RISC and subsequent target RNA cleavage.\",\n      \"method\": \"Chromatographic purification of kinase activity from HeLa cells, in vitro RNA kinase assay, siRNA phosphorylation monitoring, RISC assembly/cleavage assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — biochemical purification, in vitro kinase assay with defined substrates, functional RISC incorporation assay; foundational study replicated by subsequent work\",\n      \"pmids\": [\"17495927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Human CLP1 kinase activity can functionally substitute for the 5'-OH RNA kinase module of yeast/plant tRNA ligases in vivo, demonstrating its role as a tRNA splicing enzyme. Mutations in the kinase active site abolish this tRNA splicing activity. Yeast Clp1, unlike human CLP1, has no detectable RNA kinase activity in vitro.\",\n      \"method\": \"Complementation of conditional and lethal kinase-defective tRNA ligase mutations in budding yeast by hCLP1 expression; in vitro RNA kinase assay with purified recombinant yClp1; kinase active-site mutagenesis\",\n      \"journal\": \"RNA\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro kinase assay with mutagenesis, in vivo complementation in yeast, multiple orthogonal methods in one study\",\n      \"pmids\": [\"18648070\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Loss of CLP1 kinase activity in mice (kinase-dead Clp1 K/K) causes progressive spinal motor neuron loss. Mechanistically, loss of CLP1 activity results in accumulation of small RNA fragments derived from aberrant processing of tyrosine pre-tRNA. These tRNA fragments sensitize cells to oxidative-stress-induced p53 activation and p53-dependent cell death. Genetic inactivation of p53 rescues motor neuron loss, muscle denervation, and respiratory failure in Clp1 K/K mice.\",\n      \"method\": \"Kinase-dead knock-in mouse model; small RNA sequencing; p53 genetic knockout epistasis; neuromuscular junction analysis; motor function assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — kinase-dead knock-in mouse, small RNA sequencing, genetic epistasis with p53 rescue, multiple orthogonal methods\",\n      \"pmids\": [\"23474986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"A human CLP1 missense mutation (p.R140H) causes loss of CLP1 interaction with the tRNA splicing endonuclease (TSEN) complex, largely reduced pre-tRNA cleavage activity, and accumulation of linear tRNA introns. CLP1 kinase-dead mice also display microcephaly and reduced cortical brain volume due to enhanced cell death of neuronal progenitors.\",\n      \"method\": \"Patient genome sequencing; co-immunoprecipitation of CLP1-TSEN complex; pre-tRNA cleavage assay; kinase-dead mouse histology and neuronal progenitor analysis\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct biochemical assay of TSEN complex interaction and pre-tRNA cleavage, kinase-dead mouse model, replicated by companion paper (PMID:24766810)\",\n      \"pmids\": [\"24766809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The CLP1 founder mutation (R140H) causes defective CLP1 kinase activity and destabilization of the TSEN complex, resulting in impaired pre-tRNA cleavage. Patient-derived induced neurons display depletion of mature tRNAs and accumulation of unspliced pre-tRNAs. Transfection of partially processed tRNA fragments into patient cells exacerbates oxidative stress-induced reduction in cell survival.\",\n      \"method\": \"CLP1 kinase assay; TSEN complex co-immunoprecipitation/stability assay; zebrafish germline clp1 null rescue with wild-type vs. mutant human CLP1; tRNA northern blot from patient-derived induced neurons; tRNA fragment transfection + oxidative stress survival assay\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro kinase assay, co-IP of TSEN complex, zebrafish rescue experiments, patient cell functional assays; multiple orthogonal methods\",\n      \"pmids\": [\"24766810\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structures of C. elegans Clp1 (ceClp1) in nucleotide- and RNA-bound states define the RNA specificity mechanism: an RNA binding motif termed 'clasp' confers RNA substrate specificity, and a conformational switch involving the essential Walker A lysine (Lys127) regulates enzymatic activity. This switch is proposed as a broadly conserved mechanistic feature of P-loop proteins.\",\n      \"method\": \"X-ray crystallography; biochemical kinase assays; active-site mutagenesis\",\n      \"journal\": \"Molecular Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structures in multiple reaction states combined with biochemical assays and mutagenesis in a single rigorous study\",\n      \"pmids\": [\"24813946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure of yeast Clp1 in ternary complex with ATP and the Clp1-binding region of Pcf11 reveals three domains (N-terminal beta sandwich, central ATP-binding, C-terminal alpha/beta-fold). The nucleotide-binding site resembles SIMIBI-class ATPases but does not hydrolyze ATP. Three highly conserved Pcf11 residues mediate most protein-protein contacts at the central domain.\",\n      \"method\": \"X-ray crystallography (ternary complex structure)\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure at atomic resolution with identification of binding interface; single lab but high-quality structural method\",\n      \"pmids\": [\"17151076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Yeast Clp1 interacts with CPF (Cleavage and Polyadenylation Factor) through its N-terminal and central domains, providing cross-factor connections in the mRNA 3'-processing complex. Mutations in the conserved ATP-binding site that prevent ATP binding disrupt the Clp1-Pcf11 interaction (rather than ATP binding per se). Mutations in Pcf11 that disrupt Clp1 contact cause defects in 3'-end processing and transcription termination.\",\n      \"method\": \"Yeast two-hybrid; co-immunoprecipitation; in vitro reconstitution of mutant CFIA; coupled in vitro transcription/3'-end processing assays; growth assays\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reciprocal interaction mapping, in vitro processing reconstitution, mutagenesis, confirmed by companion paper (PMID:22216186)\",\n      \"pmids\": [\"21993299\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Yeast Clp1 is required to assemble recombinant CF IA; depletion of Clp1 in yeast causes defective mRNA 3'-end formation and RNA Pol II transcription termination. The P-loop (ATP-binding) motif of Clp1 plays a structural role in CF IA organization, with ATP binding contributing to CF IA assembly and cross-factor interactions with CPF component Ysh1.\",\n      \"method\": \"Yeast Clp1 depletion; in vitro transcription/3'-end processing complementation assay; P-loop mutagenesis; recombinant CF IA reconstitution; interaction assays with CPF subunits\",\n      \"journal\": \"PLoS ONE\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro reconstitution, mutagenesis, depletion phenotypes, multiple orthogonal methods; confirmed by companion paper (PMID:21993299)\",\n      \"pmids\": [\"22216186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Yeast Clp1 depletion abolishes RNA Pol II transcription termination. Clp1 is essential for CF IA assembly and transmits conformational changes to RNA Pol II through Pcf11 to couple transcription termination with 3'-end processing.\",\n      \"method\": \"Clp1 depletion in yeast; ChIP analysis of Rna15 and Pcf11 at gene 3'-ends; ATP-binding domain and Pcf11-binding region double mutant analysis; 3'-end processing assays\",\n      \"journal\": \"Nucleic Acids Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP, depletion experiments, mutagenesis, multiple orthogonal methods in one study\",\n      \"pmids\": [\"21993300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CLP1 R140H mutation in mouse models of PCH10 dysregulates products of intron-containing tRNA genes (pre-tRNAs, introns, and certain tRNA fragments up-regulated; other fragments down-regulated) without affecting mature tRNA levels. Additionally, CLP1 mutation shifts poly(A) site usage from proximal to distal sites in spinal cord, particularly in short and closely spaced genes, consistent with impaired mRNA 3' processing.\",\n      \"method\": \"Knock-in mouse models (homozygous R140H and compound heterozygous); tRNA gene product profiling; poly(A) site usage sequencing; gene expression analysis in spinal cord\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — two independent mouse models, tRNA profiling, poly(A) sequencing, multiple orthogonal methods in one study\",\n      \"pmids\": [\"34548404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CLP1 is the main RNA kinase phosphorylating the 5' end of siRNAs in mouse cells; NOL9 (a related RNA kinase) shows no apparent RNA kinase activity in mouse cells or with recombinant protein, and NOL9 overexpression does not rescue reduced siRNA efficiency in CLP1 kinase-dead cells.\",\n      \"method\": \"siRNA efficiency assay in Clp1 K/K cells; recombinant murine NOL9 in vitro RNA kinase assay; NOL9 overexpression rescue experiment\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay for NOL9, siRNA functional assay in kinase-dead cells, single lab\",\n      \"pmids\": [\"32081435\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CLP1 R140H mutation causes intracellular accumulation of both isoleucine pre-tRNA intron fragments (Ile-introns) and 5' tRNA fragments derived from tyrosine pre-tRNAs in knock-in mice, suggesting two types of aberrant RNA fragments may cooperatively or independently contribute to PCH10 pathogenesis.\",\n      \"method\": \"CLP1 R140H knock-in mouse generation; RNA fragment analysis by northern blot/sequencing; motor neuron loss quantification\",\n      \"journal\": \"Biochemical and Biophysical Research Communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knock-in mouse model with RNA fragment profiling; single lab, extends prior findings\",\n      \"pmids\": [\"34273619\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"CLP1 promotes 3'-UTR shortening associated with higher transcript stability and expression of Aire-sensitive genes in thymic medullary epithelial cells, representing a post-transcriptional level of control via the 3'-end processing complex.\",\n      \"method\": \"RNAi screen; lentigenic mouse model; 3'-end sequencing; transcript stability assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi knockdown combined with in vivo mouse model, 3'-end profiling; single lab\",\n      \"pmids\": [\"32338592\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In Drosophila, nuclear Cbc (the CLP1 ortholog) is required to promote meiosis entry in the testis. Cbc physically and/or genetically interacts with Tsen54 (the C-terminal half of Tsen54 is necessary and sufficient for binding) and TER94 (VCP ortholog) in this process. Mammalian CLP1 can rescue Drosophila fertility defects, demonstrating functional conservation.\",\n      \"method\": \"Genetic manipulation in Drosophila testis; co-immunoprecipitation; domain mapping of Tsen54-Cbc interaction; subcellular localization assay; mammalian CLP1 rescue of Drosophila fertility\",\n      \"journal\": \"Human Molecular Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis, co-IP, domain mapping, cross-species rescue; single lab\",\n      \"pmids\": [\"33864361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The HEAB gene (human CLP1 alias) encodes a 425-amino acid protein containing an ATP/GTP-binding motif with homology to the ATP-binding transporter superfamily or GTP-binding proteins. It is expressed ubiquitously, with highest expression in testis and skeletal muscle.\",\n      \"method\": \"cDNA cloning; Northern blot; sequence analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — sequence/expression characterization only; no functional mechanistic experiment on the protein\",\n      \"pmids\": [\"8896421\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CLP1 (hClp1/HEAB) is an RNA-specific 5'-OH polynucleotide kinase that functions as a structural and catalytic subunit of two major RNA processing machineries: the tRNA splicing endonuclease (TSEN) complex, where its kinase activity phosphorylates the 5' end of the 3' tRNA exon to enable exon ligation and is required for pre-tRNA cleavage, and the mRNA 3'-end cleavage/polyadenylation complex (CF IA), where it bridges CF IA and CPF through its N-terminal and ATP-binding domains and is essential for CF IA assembly, poly(A) site selection, and RNA Pol II transcription termination; loss of its kinase activity causes accumulation of aberrant tRNA-derived fragments (especially from tyrosine and isoleucine pre-tRNAs) that sensitize neurons to oxidative-stress-induced p53-dependent cell death, underlying progressive motor neuron loss and the human neurodegenerative disease pontocerebellar hypoplasia type 10 (PCH10).\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CLP1 is an RNA-specific 5'-OH polynucleotide kinase that serves as a shared catalytic and structural component of two RNA processing machineries: the tRNA splicing endonuclease (TSEN) complex and the mRNA 3'-end cleavage/polyadenylation apparatus [#0, #3, #7]. In tRNA splicing, CLP1 phosphorylates the 5' end of the 3' tRNA exon to license exon ligation, and it can also phosphorylate synthetic siRNAs to enable their incorporation into RISC [#0]; its kinase activity is sufficient to substitute for the kinase module of yeast/plant tRNA ligases in vivo, while yeast Clp1 lacks detectable kinase activity [#1]. Structural work defines a three-domain architecture (N-terminal β-sandwich, central SIMIBI-like ATP-binding domain, C-terminal α/β fold) in which an RNA-binding 'clasp' motif confers substrate specificity and a Walker A lysine governs a catalytic conformational switch [#5, #6]. CLP1 associates with the TSEN complex to support pre-tRNA cleavage [#3, #4], and within CF IA it bridges to the cleavage and polyadenylation factor through its N-terminal and ATP-binding domains, where ATP binding is required not for hydrolysis but for the Clp1–Pcf11 interaction and CF IA assembly that drives poly(A) site selection and RNA Pol II transcription termination [#6, #7, #8, #9]. Loss of CLP1 kinase activity uncouples these functions pathologically: aberrant tRNA-derived fragments (from tyrosine and isoleucine pre-tRNAs) accumulate and sensitize neurons to oxidative-stress-induced p53-dependent death, with p53 deletion rescuing motor neuron loss in kinase-dead mice [#2, #12]. The human CLP1 p.R140H mutation destabilizes CLP1–TSEN association, impairs pre-tRNA cleavage, and shifts poly(A) site usage, causing the neurodegenerative disease pontocerebellar hypoplasia type 10 [#3, #4, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 2007,\n      \"claim\": \"Established CLP1's core biochemical identity by showing it is the long-sought 5'-OH RNA kinase that phosphorylates the 3' tRNA exon to permit ligation, also acting on siRNAs for RISC loading.\",\n      \"evidence\": \"Chromatographic purification of kinase activity from HeLa cells with in vitro RNA kinase and RISC assembly assays\",\n      \"pmids\": [\"17495927\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the structural basis of RNA specificity\", \"Did not establish the physiological consequence of kinase loss in an organism\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated that human CLP1 kinase activity is functionally a tRNA splicing enzyme and that this activity is species-divergent, since yeast Clp1 has none.\",\n      \"evidence\": \"In vivo complementation of kinase-defective yeast tRNA ligase mutants by hCLP1, recombinant yClp1 kinase assay, active-site mutagenesis\",\n      \"pmids\": [\"18648070\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not explain why yeast retains a kinase-dead Clp1\", \"Did not map the kinase to a complex in human cells\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined CLP1's three-domain architecture and its non-hydrolytic, SIMIBI-like nucleotide-binding site, and identified the Pcf11 binding interface, revealing its scaffolding role in 3'-end processing.\",\n      \"evidence\": \"X-ray crystallography of yeast Clp1 in ternary complex with ATP and the Pcf11 Clp1-binding region\",\n      \"pmids\": [\"17151076\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address human CLP1 kinase mechanism\", \"Structure was of the kinase-inactive yeast ortholog\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Resolved CLP1's structural role in mRNA 3'-end processing by showing it bridges CF IA to CPF, requires ATP binding (not hydrolysis) for the Pcf11 interaction, and is essential for CF IA assembly and Pol II transcription termination.\",\n      \"evidence\": \"Yeast two-hybrid, co-IP, in vitro CF IA reconstitution, P-loop mutagenesis, ChIP, and depletion phenotypes across three companion studies\",\n      \"pmids\": [\"21993299\", \"22216186\", \"21993300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Performed in yeast where Clp1 lacks kinase activity, leaving the human 3'-processing role inferred\", \"Did not connect 3'-processing function to disease\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Linked CLP1 kinase loss to a disease-relevant mechanism by showing kinase-dead mice accumulate aberrant tyrosine pre-tRNA fragments that drive oxidative-stress-induced p53-dependent motor neuron death.\",\n      \"evidence\": \"Kinase-dead knock-in mouse, small RNA sequencing, p53 knockout epistasis rescue, neuromuscular analysis\",\n      \"pmids\": [\"23474986\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define how tRNA fragments activate p53\", \"Did not establish the human genetic link\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified CLP1 p.R140H as a human disease mutation causing pontocerebellar hypoplasia by disrupting TSEN complex association and pre-tRNA cleavage, with neuronal and oxidative-stress phenotypes recapitulated across mice, zebrafish, and patient cells.\",\n      \"evidence\": \"Patient genome sequencing, TSEN co-IP/stability assays, pre-tRNA cleavage assays, zebrafish null rescue, patient-derived induced neurons, kinase-dead mouse histology\",\n      \"pmids\": [\"24766809\", \"24766810\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not fully separate the TSEN/tRNA defect from the 3'-processing defect in disease\", \"Mechanism of progenitor cell death not molecularly resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established the structural mechanism of CLP1 RNA specificity and catalytic regulation, identifying the 'clasp' RNA-binding motif and a Walker A lysine conformational switch.\",\n      \"evidence\": \"X-ray crystallography of C. elegans Clp1 in nucleotide- and RNA-bound states with biochemical kinase assays and mutagenesis\",\n      \"pmids\": [\"24813946\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures were of the C. elegans ortholog\", \"Did not connect the switch to human disease mutations\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Refined the disease model by showing CLP1 R140H dysregulates intron-containing tRNA gene products and shifts poly(A) site usage, implicating both tRNA and mRNA 3'-processing defects in PCH10.\",\n      \"evidence\": \"Two independent knock-in mouse models with tRNA gene product profiling and poly(A) site sequencing in spinal cord\",\n      \"pmids\": [\"34548404\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not determine relative contribution of tRNA versus poly(A) defects to neurodegeneration\", \"Causality of poly(A) shifts for phenotype not established\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Clarified CLP1 as the dominant cellular siRNA 5'-kinase by showing the related kinase NOL9 cannot substitute for it.\",\n      \"evidence\": \"siRNA efficiency assays in Clp1 kinase-dead cells, recombinant NOL9 kinase assays, and NOL9 overexpression rescue attempts\",\n      \"pmids\": [\"32081435\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study\", \"Did not address whether other kinases compensate in vivo\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended CLP1's mRNA 3'-processing role to immune tolerance by showing it promotes 3'-UTR shortening that stabilizes Aire-sensitive transcripts in thymic medullary epithelial cells.\",\n      \"evidence\": \"RNAi screen, lentigenic mouse model, 3'-end sequencing, transcript stability assays\",\n      \"pmids\": [\"32338592\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study\", \"Mechanistic link between CLP1 and specific poly(A) site choice not resolved\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Broadened the spectrum of pathogenic RNA species in PCH10 by showing R140H mice accumulate both isoleucine pre-tRNA intron fragments and tyrosine-derived 5' tRNA fragments.\",\n      \"evidence\": \"R140H knock-in mouse with RNA fragment profiling and motor neuron loss quantification\",\n      \"pmids\": [\"34273619\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not determine whether the two fragment types act cooperatively or independently\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Revealed a conserved developmental role for CLP1 in promoting meiosis entry through interactions with TSEN54 and the VCP ortholog, with cross-species functional rescue.\",\n      \"evidence\": \"Drosophila testis genetics, co-IP, Tsen54-Cbc domain mapping, localization, and mammalian CLP1 rescue of fly fertility\",\n      \"pmids\": [\"33864361\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Performed in Drosophila\", \"Mechanism connecting tRNA processing to meiosis entry unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CLP1 partitions its kinase activity and scaffolding between TSEN-mediated tRNA splicing and CF IA-mediated mRNA 3'-end processing, and how the relative loss of each function determines tissue-specific neurodegeneration, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of human CLP1 within either intact human complex\", \"Quantitative contribution of tRNA-fragment toxicity versus poly(A)/3'-processing defects to PCH10 undefined\", \"Molecular pathway connecting tRNA fragments to p53 activation not identified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 5]},\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [6, 7, 8]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [7, 8]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 3, 4]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [7, 8, 9]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 4, 10]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\"TSEN complex\", \"CF IA\"],\n    \"partners\": [\"TSEN54\", \"PCF11\", \"YSH1\", \"NOL9\", \"VCP\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}