{"gene":"NIP7","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2010,"finding":"Human NIP7 is required for accurate pre-rRNA processing: depletion causes decreased 34S pre-rRNA and increased 26S and 21S pre-rRNA concentrations, indicating slower processing at site 2, resulting in an imbalance of the 40S/60S subunit ratio and showing NIP7 is required for 18S rRNA maturation.","method":"Conditional knockdown (siRNA) with pre-rRNA processing analysis and sucrose gradient sedimentation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean knockdown with specific pre-rRNA processing phenotype and multiple readouts in a single focused study","pmids":["20798176"],"is_preprint":false},{"year":2010,"finding":"Human NIP7 protein is restricted to the nuclear compartment and co-sediments with complexes in the range of 40S–80S molecular mass, suggesting association with nucleolar pre-ribosomal particles.","method":"Subcellular fractionation and sucrose gradient sedimentation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct fractionation experiment, single lab, single method","pmids":["20798176"],"is_preprint":false},{"year":2011,"finding":"Human NIP7 interacts with FTSJ3 (a putative ortholog of yeast Spb1p): identified by yeast two-hybrid and confirmed by colocalization and co-immunoprecipitation. Both proteins function in the same pre-rRNA processing pathway leading to 18S rRNA maturation.","method":"Yeast two-hybrid, co-immunoprecipitation, colocalization, and conditional knockdown of FTSJ3 showing accumulation of 34S pre-rRNA","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal/complementary co-IP plus yeast two-hybrid plus functional knockdown phenotype, multiple orthogonal methods in a single focused study","pmids":["22195017"],"is_preprint":false},{"year":2007,"finding":"The PUA domain of Nip7 mediates specific binding to polyuridine RNA; specific residues of the PUA domain (R151, R152, K155, K158 in archaeal PaNip7; hydrophobic equivalents in eukaryotic Nip7) are required for RNA interaction, as determined by site-directed mutagenesis and RNA interaction assays. Both archaeal and eukaryotic Nip7 orthologues bind polyuridine, indicating this preference is conserved.","method":"Crystal structure determination of PaNip7, structural alignment, site-directed mutagenesis, and in vitro RNA interaction assays (yeast and archaeal Nip7)","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and in vitro RNA binding assays, replicated across two orthologues","pmids":["18001138"],"is_preprint":false},{"year":2004,"finding":"Crystal structure of human KD93 (NIP7 homologue/alias HSPC031) was solved at 1.9 Å resolution by MAD, revealing two interlinked α/β domains; the C-terminal domain matches the PUA domain of RNA modification enzymes (e.g., ArcTGT), suggesting RNA-binding function, while the N-terminal domain is structurally unique.","method":"X-ray crystallography (MAD, 1.9 Å resolution), structure-based homology analysis (DALI)","journal":"Journal of structural biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — high-resolution crystal structure, single study, functional inference from structural homology without direct RNA binding validation","pmids":["15522784"],"is_preprint":false},{"year":2024,"finding":"Chlamydomonas reinhardtii NIP7 (CrNip7) can complement the NIP7 role in yeast, implicating it in 60S ribosomal subunit biogenesis. Yeast two-hybrid identified UNC-p and G-patch proteins as potential CrNip7 interaction partners. Nucleic acid interaction assays indicated that both N- and C-terminal domains of CrNip7 are involved in rRNA interaction.","method":"Protein complementation assay in yeast, paromomycin resistance test, yeast two-hybrid, nucleic acid interaction assay","journal":"Biochimica et biophysica acta. Proteins and proteomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional complementation plus yeast two-hybrid plus nucleic acid binding, multiple methods but in a non-mammalian model ortholog study","pmids":["39216654"],"is_preprint":false},{"year":2025,"finding":"NIP7 silencing in anaplastic thyroid cancer cells reduces UBE2C protein levels without affecting UBE2C mRNA, indicating NIP7 promotes UBE2C expression at the translational level. UBE2C overexpression rescues the proliferation defect caused by NIP7 silencing, placing NIP7 upstream of UBE2C in a pathway supporting ATC tumor growth.","method":"siRNA knockdown, Western blotting, qRT-PCR, SUnSET (surface sensing of translation) assay, co-immunoprecipitation, rescue experiment with UBE2C overexpression, xenograft tumor model","journal":"Zhejiang da xue xue bao. Yi xue ban","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (SUnSET, co-IP, rescue experiment) in a single lab study","pmids":["40461291"],"is_preprint":false}],"current_model":"NIP7 is a nucleolar RNA-binding protein whose PUA domain specifically binds polyuridine RNA; in human cells it is required for pre-rRNA processing at site 2 to produce 18S rRNA and 40S subunit maturation, physically interacts with FTSJ3 in this pathway, and also promotes translation of UBE2C protein downstream of its ribosome biogenesis function."},"narrative":{"mechanistic_narrative":"NIP7 is a nucleolar RNA-binding protein required for pre-rRNA processing and 40S ribosomal subunit maturation [PMID:20798176]. Its conserved C-terminal PUA domain mediates specific binding to polyuridine RNA, with defined basic residues required for the interaction across archaeal and eukaryotic orthologues, while the N-terminal domain is structurally distinct; both domains contribute to rRNA interaction [PMID:18001138, PMID:15522784, PMID:39216654]. In human cells, depletion slows pre-rRNA processing at site 2, decreasing 34S pre-rRNA and accumulating 26S and 21S species, which disrupts the 40S/60S subunit balance and impairs 18S rRNA maturation [PMID:20798176]. NIP7 acts in this pathway together with FTSJ3, with which it physically interacts and shares a loss-of-function pre-rRNA processing phenotype [PMID:22195017]. Beyond ribosome biogenesis, NIP7 promotes translation of UBE2C protein without altering its mRNA, and this UBE2C-supporting activity sustains proliferation in anaplastic thyroid cancer cells [PMID:40461291].","teleology":[{"year":2004,"claim":"Establishing the architecture of the human NIP7 homologue framed it as a candidate RNA-binding factor before any RNA function was tested.","evidence":"X-ray crystallography (1.9 Å, MAD) and DALI-based structural homology analysis of human KD93/HSPC031","pmids":["15522784"],"confidence":"Medium","gaps":["RNA binding inferred from structural homology to PUA-domain enzymes, not directly demonstrated","in vivo function not addressed","N-terminal domain role undefined"]},{"year":2007,"claim":"Direct RNA-binding assays converted the structural inference into a defined molecular activity, showing the PUA domain selects polyuridine RNA via specific basic residues conserved across orthologues.","evidence":"PaNip7 crystal structure, structural alignment, site-directed mutagenesis, and in vitro RNA interaction assays in yeast and archaeal Nip7","pmids":["18001138"],"confidence":"High","gaps":["physiological RNA target within pre-ribosome not identified","binding tested in vitro, not in cells","does not establish processing step affected"]},{"year":2010,"claim":"Knockdown placed NIP7 in human ribosome biogenesis, localizing it to a specific pre-rRNA processing step and to nucleolar pre-ribosomal particles.","evidence":"siRNA knockdown with pre-rRNA processing analysis, subcellular fractionation, and sucrose gradient sedimentation","pmids":["20798176"],"confidence":"High","gaps":["molecular mechanism of site 2 cleavage promotion unknown","direct enzymatic role versus scaffolding not distinguished","composition of the associated pre-ribosomal particles not defined"]},{"year":2011,"claim":"Identifying FTSJ3 as a physical partner connected NIP7 to a defined protein in the same 18S maturation pathway.","evidence":"Yeast two-hybrid, co-immunoprecipitation, colocalization, and FTSJ3 knockdown showing 34S pre-rRNA accumulation","pmids":["22195017"],"confidence":"High","gaps":["stoichiometry and structural basis of the NIP7-FTSJ3 interaction unknown","whether they act in a stable complex not established","additional pathway partners not mapped"]},{"year":2024,"claim":"Cross-species complementation confirmed functional conservation and implicated NIP7 in 60S subunit biogenesis, while extending rRNA contact to both domains.","evidence":"Yeast complementation and paromomycin resistance, yeast two-hybrid, and nucleic acid interaction assays with Chlamydomonas CrNip7","pmids":["39216654"],"confidence":"Medium","gaps":["UNC-p and G-patch partners identified only as candidates by yeast two-hybrid","60S role inferred from yeast complementation, not shown in plant or mammalian cells","human relevance of 60S involvement untested"]},{"year":2025,"claim":"A translational function downstream of ribosome biogenesis was uncovered, linking NIP7 to UBE2C protein production and to tumor proliferation.","evidence":"siRNA knockdown, SUnSET translation assay, Western blot, qRT-PCR, co-IP, UBE2C-overexpression rescue, and xenograft model in anaplastic thyroid cancer cells","pmids":["40461291"],"confidence":"Medium","gaps":["mechanism by which NIP7 selectively promotes UBE2C translation unknown","whether the effect is direct or a general consequence of ribosome biogenesis loss not resolved","single-lab study in one cancer context"]},{"year":null,"claim":"How NIP7's polyuridine-binding PUA domain mechanistically drives site 2 cleavage and the basis for selective UBE2C translational promotion remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["no structure of the human NIP7-containing pre-ribosomal complex","physiological RNA substrate in cells unmapped","link between ribosome biogenesis role and UBE2C-specific translation unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[3,4,5]}],"localization":[{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[1]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,2]}],"complexes":[],"partners":["FTSJ3"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9Y221","full_name":"60S ribosome subunit biogenesis protein NIP7 homolog","aliases":["KD93","Nucleolar pre-rRNA processing protein NIP7"],"length_aa":180,"mass_kda":20.5,"function":"Required for proper 34S pre-rRNA processing and 60S ribosome subunit assembly","subcellular_location":"Nucleus, nucleolus","url":"https://www.uniprot.org/uniprotkb/Q9Y221/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/NIP7","classification":"Common Essential","n_dependent_lines":1208,"n_total_lines":1208,"dependency_fraction":1.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"NOP2","stoichiometry":4.0},{"gene":"DNAJC8","stoichiometry":0.2},{"gene":"RPS16","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NIP7","total_profiled":1310},"omim":[{"mim_id":"619204","title":"NUCLEOLAR PRE-rRNA-PROCESSING PROTEIN NIP7; NIP7","url":"https://www.omim.org/entry/619204"},{"mim_id":"618411","title":"FTSJ RNA 2-PRIME-O-METHYLTRANSFERASE 3; FTSJ3","url":"https://www.omim.org/entry/618411"},{"mim_id":"611534","title":"NUCLEOLAR PROTEIN 8; NOL8","url":"https://www.omim.org/entry/611534"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Nucleoli","reliability":"Supported"},{"location":"Nucleoplasm","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NIP7"},"hgnc":{"alias_symbol":["CGI-37","FLJ10296","HSPC031","KD93"],"prev_symbol":[]},"alphafold":{"accession":"Q9Y221","domains":[{"cath_id":"3.10.450.220","chopping":"1-87","consensus_level":"high","plddt":92.312,"start":1,"end":87},{"cath_id":"2.30.130.10","chopping":"95-174","consensus_level":"high","plddt":96.93,"start":95,"end":174}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y221","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y221-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9Y221-F1-predicted_aligned_error_v6.png","plddt_mean":93.94},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NIP7","jax_strain_url":"https://www.jax.org/strain/search?query=NIP7"},"sequence":{"accession":"Q9Y221","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9Y221.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9Y221/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9Y221"}},"corpus_meta":[{"pmid":"22195017","id":"PMC_22195017","title":"The human nucleolar protein FTSJ3 associates with NIP7 and functions in pre-rRNA processing.","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/22195017","citation_count":32,"is_preprint":false},{"pmid":"20798176","id":"PMC_20798176","title":"The NIP7 protein is required for accurate pre-rRNA processing in human cells.","date":"2010","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/20798176","citation_count":31,"is_preprint":false},{"pmid":"18001138","id":"PMC_18001138","title":"Structural insights into the interaction of the Nip7 PUA domain with polyuridine RNA.","date":"2007","source":"Biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/18001138","citation_count":12,"is_preprint":false},{"pmid":"15522784","id":"PMC_15522784","title":"Crystal structure of KD93, a novel protein expressed in human hematopoietic stem/progenitor cells.","date":"2004","source":"Journal of structural biology","url":"https://pubmed.ncbi.nlm.nih.gov/15522784","citation_count":7,"is_preprint":false},{"pmid":"25315147","id":"PMC_25315147","title":"Molecular dynamics simulations of the Nip7 proteins from the marine deep- and shallow-water Pyrococcus species.","date":"2014","source":"BMC structural biology","url":"https://pubmed.ncbi.nlm.nih.gov/25315147","citation_count":5,"is_preprint":false},{"pmid":"27924686","id":"PMC_27924686","title":"High temperature and pressure influence the interdomain orientation of Nip7 proteins from P. abyssi and P. furiosus: MD simulations.","date":"2017","source":"Journal of biomolecular structure & dynamics","url":"https://pubmed.ncbi.nlm.nih.gov/27924686","citation_count":3,"is_preprint":false},{"pmid":"27832721","id":"PMC_27832721","title":"Identification of residues of the archaeal RNA-binding Nip7 proteins specific to environmental conditions.","date":"2016","source":"Journal of bioinformatics and computational biology","url":"https://pubmed.ncbi.nlm.nih.gov/27832721","citation_count":3,"is_preprint":false},{"pmid":"40461291","id":"PMC_40461291","title":"[NIP7 upregulates the expression of ubiquitin-conjugating enzyme E2 C to promote tumor growth in anaplastic thyroid cancer].","date":"2025","source":"Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/40461291","citation_count":0,"is_preprint":false},{"pmid":"39216654","id":"PMC_39216654","title":"Assigning roles in Chlamydomonas ribosome biogenesis: The conserved factor NIP7.","date":"2024","source":"Biochimica et biophysica acta. Proteins and proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/39216654","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":6681,"output_tokens":1754,"usd":0.023176,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8625,"output_tokens":2245,"usd":0.049625,"stage2_stop_reason":"end_turn"},"total_usd":0.072801,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2010,\n      \"finding\": \"Human NIP7 is required for accurate pre-rRNA processing: depletion causes decreased 34S pre-rRNA and increased 26S and 21S pre-rRNA concentrations, indicating slower processing at site 2, resulting in an imbalance of the 40S/60S subunit ratio and showing NIP7 is required for 18S rRNA maturation.\",\n      \"method\": \"Conditional knockdown (siRNA) with pre-rRNA processing analysis and sucrose gradient sedimentation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockdown with specific pre-rRNA processing phenotype and multiple readouts in a single focused study\",\n      \"pmids\": [\"20798176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human NIP7 protein is restricted to the nuclear compartment and co-sediments with complexes in the range of 40S–80S molecular mass, suggesting association with nucleolar pre-ribosomal particles.\",\n      \"method\": \"Subcellular fractionation and sucrose gradient sedimentation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct fractionation experiment, single lab, single method\",\n      \"pmids\": [\"20798176\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Human NIP7 interacts with FTSJ3 (a putative ortholog of yeast Spb1p): identified by yeast two-hybrid and confirmed by colocalization and co-immunoprecipitation. Both proteins function in the same pre-rRNA processing pathway leading to 18S rRNA maturation.\",\n      \"method\": \"Yeast two-hybrid, co-immunoprecipitation, colocalization, and conditional knockdown of FTSJ3 showing accumulation of 34S pre-rRNA\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal/complementary co-IP plus yeast two-hybrid plus functional knockdown phenotype, multiple orthogonal methods in a single focused study\",\n      \"pmids\": [\"22195017\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The PUA domain of Nip7 mediates specific binding to polyuridine RNA; specific residues of the PUA domain (R151, R152, K155, K158 in archaeal PaNip7; hydrophobic equivalents in eukaryotic Nip7) are required for RNA interaction, as determined by site-directed mutagenesis and RNA interaction assays. Both archaeal and eukaryotic Nip7 orthologues bind polyuridine, indicating this preference is conserved.\",\n      \"method\": \"Crystal structure determination of PaNip7, structural alignment, site-directed mutagenesis, and in vitro RNA interaction assays (yeast and archaeal Nip7)\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and in vitro RNA binding assays, replicated across two orthologues\",\n      \"pmids\": [\"18001138\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Crystal structure of human KD93 (NIP7 homologue/alias HSPC031) was solved at 1.9 Å resolution by MAD, revealing two interlinked α/β domains; the C-terminal domain matches the PUA domain of RNA modification enzymes (e.g., ArcTGT), suggesting RNA-binding function, while the N-terminal domain is structurally unique.\",\n      \"method\": \"X-ray crystallography (MAD, 1.9 Å resolution), structure-based homology analysis (DALI)\",\n      \"journal\": \"Journal of structural biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — high-resolution crystal structure, single study, functional inference from structural homology without direct RNA binding validation\",\n      \"pmids\": [\"15522784\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Chlamydomonas reinhardtii NIP7 (CrNip7) can complement the NIP7 role in yeast, implicating it in 60S ribosomal subunit biogenesis. Yeast two-hybrid identified UNC-p and G-patch proteins as potential CrNip7 interaction partners. Nucleic acid interaction assays indicated that both N- and C-terminal domains of CrNip7 are involved in rRNA interaction.\",\n      \"method\": \"Protein complementation assay in yeast, paromomycin resistance test, yeast two-hybrid, nucleic acid interaction assay\",\n      \"journal\": \"Biochimica et biophysica acta. Proteins and proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional complementation plus yeast two-hybrid plus nucleic acid binding, multiple methods but in a non-mammalian model ortholog study\",\n      \"pmids\": [\"39216654\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NIP7 silencing in anaplastic thyroid cancer cells reduces UBE2C protein levels without affecting UBE2C mRNA, indicating NIP7 promotes UBE2C expression at the translational level. UBE2C overexpression rescues the proliferation defect caused by NIP7 silencing, placing NIP7 upstream of UBE2C in a pathway supporting ATC tumor growth.\",\n      \"method\": \"siRNA knockdown, Western blotting, qRT-PCR, SUnSET (surface sensing of translation) assay, co-immunoprecipitation, rescue experiment with UBE2C overexpression, xenograft tumor model\",\n      \"journal\": \"Zhejiang da xue xue bao. Yi xue ban\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (SUnSET, co-IP, rescue experiment) in a single lab study\",\n      \"pmids\": [\"40461291\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NIP7 is a nucleolar RNA-binding protein whose PUA domain specifically binds polyuridine RNA; in human cells it is required for pre-rRNA processing at site 2 to produce 18S rRNA and 40S subunit maturation, physically interacts with FTSJ3 in this pathway, and also promotes translation of UBE2C protein downstream of its ribosome biogenesis function.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NIP7 is a nucleolar RNA-binding protein required for pre-rRNA processing and 40S ribosomal subunit maturation [#0, #1]. Its conserved C-terminal PUA domain mediates specific binding to polyuridine RNA, with defined basic residues required for the interaction across archaeal and eukaryotic orthologues, while the N-terminal domain is structurally distinct; both domains contribute to rRNA interaction [#3, #4, #5]. In human cells, depletion slows pre-rRNA processing at site 2, decreasing 34S pre-rRNA and accumulating 26S and 21S species, which disrupts the 40S/60S subunit balance and impairs 18S rRNA maturation [#0]. NIP7 acts in this pathway together with FTSJ3, with which it physically interacts and shares a loss-of-function pre-rRNA processing phenotype [#2]. Beyond ribosome biogenesis, NIP7 promotes translation of UBE2C protein without altering its mRNA, and this UBE2C-supporting activity sustains proliferation in anaplastic thyroid cancer cells [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Establishing the architecture of the human NIP7 homologue framed it as a candidate RNA-binding factor before any RNA function was tested.\",\n      \"evidence\": \"X-ray crystallography (1.9 Å, MAD) and DALI-based structural homology analysis of human KD93/HSPC031\",\n      \"pmids\": [\"15522784\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RNA binding inferred from structural homology to PUA-domain enzymes, not directly demonstrated\", \"in vivo function not addressed\", \"N-terminal domain role undefined\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Direct RNA-binding assays converted the structural inference into a defined molecular activity, showing the PUA domain selects polyuridine RNA via specific basic residues conserved across orthologues.\",\n      \"evidence\": \"PaNip7 crystal structure, structural alignment, site-directed mutagenesis, and in vitro RNA interaction assays in yeast and archaeal Nip7\",\n      \"pmids\": [\"18001138\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"physiological RNA target within pre-ribosome not identified\", \"binding tested in vitro, not in cells\", \"does not establish processing step affected\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Knockdown placed NIP7 in human ribosome biogenesis, localizing it to a specific pre-rRNA processing step and to nucleolar pre-ribosomal particles.\",\n      \"evidence\": \"siRNA knockdown with pre-rRNA processing analysis, subcellular fractionation, and sucrose gradient sedimentation\",\n      \"pmids\": [\"20798176\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"molecular mechanism of site 2 cleavage promotion unknown\", \"direct enzymatic role versus scaffolding not distinguished\", \"composition of the associated pre-ribosomal particles not defined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identifying FTSJ3 as a physical partner connected NIP7 to a defined protein in the same 18S maturation pathway.\",\n      \"evidence\": \"Yeast two-hybrid, co-immunoprecipitation, colocalization, and FTSJ3 knockdown showing 34S pre-rRNA accumulation\",\n      \"pmids\": [\"22195017\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"stoichiometry and structural basis of the NIP7-FTSJ3 interaction unknown\", \"whether they act in a stable complex not established\", \"additional pathway partners not mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cross-species complementation confirmed functional conservation and implicated NIP7 in 60S subunit biogenesis, while extending rRNA contact to both domains.\",\n      \"evidence\": \"Yeast complementation and paromomycin resistance, yeast two-hybrid, and nucleic acid interaction assays with Chlamydomonas CrNip7\",\n      \"pmids\": [\"39216654\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"UNC-p and G-patch partners identified only as candidates by yeast two-hybrid\", \"60S role inferred from yeast complementation, not shown in plant or mammalian cells\", \"human relevance of 60S involvement untested\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A translational function downstream of ribosome biogenesis was uncovered, linking NIP7 to UBE2C protein production and to tumor proliferation.\",\n      \"evidence\": \"siRNA knockdown, SUnSET translation assay, Western blot, qRT-PCR, co-IP, UBE2C-overexpression rescue, and xenograft model in anaplastic thyroid cancer cells\",\n      \"pmids\": [\"40461291\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mechanism by which NIP7 selectively promotes UBE2C translation unknown\", \"whether the effect is direct or a general consequence of ribosome biogenesis loss not resolved\", \"single-lab study in one cancer context\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NIP7's polyuridine-binding PUA domain mechanistically drives site 2 cleavage and the basis for selective UBE2C translational promotion remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"no structure of the human NIP7-containing pre-ribosomal complex\", \"physiological RNA substrate in cells unmapped\", \"link between ribosome biogenesis role and UBE2C-specific translation unexplained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [3, 4, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"FTSJ3\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}