{"gene":"NAF1","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2002,"finding":"Yeast Naf1p is required for accumulation of all box H/ACA snoRNAs and functions as an H/ACA snoRNP assembly factor. Naf1p is localized to the nucleus, is not a stable component of mature H/ACA snoRNPs, shows in vitro RNA-binding activity, and directly binds the core H/ACA proteins Cbf5p and Nhp2p. Naf1p also binds the phosphorylated CTD of RNA polymerase II in vivo (two-hybrid) and in cell lysates, suggesting it is recruited to the CTD to promote co-transcriptional snoRNP assembly.","method":"Genetic depletion in yeast, in vitro RNA-binding assay, two-hybrid and co-precipitation with CTD, direct binding to Cbf5p and Nhp2p","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (genetic depletion, in vitro binding, two-hybrid, co-precipitation) in a single focused study establishing the assembly factor role","pmids":["12515383"],"is_preprint":false},{"year":2009,"finding":"Human SHQ1 and NAF1 act sequentially in H/ACA RNP assembly: SHQ1 binds the core pseudouridine synthase NAP57/dyskerin both in vivo and in vitro, and this interaction precludes binding of NAF1 and other H/ACA core proteins. SHQ1 therefore acts upstream of NAF1. In an in vitro H/ACA RNP assembly system dependent on NAF1, excess recombinant SHQ1 interferes with assembly. Knockdown of SHQ1 prevents accumulation of newly synthesized H/ACA reporter RNA and reduces endogenous H/ACA RNA levels including telomerase RNA.","method":"Co-IP in vivo and in vitro binding assays, in vitro H/ACA RNP assembly system, siRNA knockdown, subcellular localization (SHQ1 excluded from Cajal bodies/nucleoli)","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — reconstituted in vitro assembly system plus reciprocal binding assays and knockdown, multiple orthogonal methods in single study","pmids":["19383767"],"is_preprint":false},{"year":2016,"finding":"Loss-of-function frameshift mutations in human NAF1 (nuclear assembly factor 1) cause pulmonary fibrosis-emphysema. A truncated NAF1 lacking the conserved C-terminal motif was detected in patient cells; this C-terminal motif is required for nuclear localization of NAF1. Introduction of the frameshift mutation by CRISPR/Cas9 genome editing reduced telomerase RNA levels. Naf1(+/-) mice generated by CRISPR/Cas9 had half the normal levels of telomerase RNA; other H/ACA RNA levels were also decreased, but rRNA pseudouridylation was intact and no ribosomal pathology was found in first-generation heterozygotes. Disease in mutation carriers is telomere-mediated, with NAF1 haploinsufficiency selectively disturbing telomere length homeostasis by decreasing telomerase RNA.","method":"Patient mutation analysis, CRISPR/Cas9 genome editing (cell lines and mice), telomerase RNA quantification, pseudouridylation assay, direct nuclear localization experiment with C-terminal deletion","journal":"Science translational medicine","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — CRISPR/Cas9 editing in both cells and mice with multiple functional readouts (telomerase RNA, pseudouridylation, telomere length), multiple orthogonal methods","pmids":["27510903"],"is_preprint":false},{"year":2019,"finding":"NAF1 (nuclear assembly factor 1) promotes 40S ribosomal subunit assembly and protein synthesis in glioma cells. NAF1 depletion triggers ribosome stress, impairs ribosomal biosynthesis, and reactivates p53 signaling by blocking MDM2. NAF1 transcription is regulated by c-Myc, NRF2, and TERT, forming positive feedback loops. NAF1 knockdown reduced cell growth in vitro and in vivo.","method":"shRNA knockdown, ribosome assembly assays, protein synthesis measurements, in vivo xenograft, transcriptional regulation analysis (c-Myc, NRF2, TERT ChIP/reporter implied), p53/MDM2 pathway analysis","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — single lab, functional KD with multiple readouts (ribosome assembly, p53/MDM2, in vivo tumor), but mechanistic depth depends on methods not fully detailed in abstract","pmids":["30936423"],"is_preprint":false}],"current_model":"NAF1 (Nuclear Assembly Factor 1) is a nuclear H/ACA RNP assembly factor that is recruited co-transcriptionally via the phosphorylated CTD of RNA Pol II; it directly binds core H/ACA proteins (Cbf5p/dyskerin, Nhp2p) to promote assembly of box H/ACA snoRNPs and telomerase RNP, acting downstream of SHQ1 in a sequential quality-control assembly pathway, and its C-terminal domain is required for nuclear localization; haploinsufficiency selectively reduces telomerase RNA levels and telomere length while sparing rRNA pseudouridylation, and it additionally promotes ribosome 40S subunit assembly and protein synthesis."},"narrative":{"mechanistic_narrative":"NAF1 is a nuclear assembly factor for box H/ACA ribonucleoproteins, required for the accumulation of all H/ACA snoRNAs and for the biogenesis of the H/ACA-class telomerase RNP [PMID:12515383]. It binds RNA in vitro and directly contacts the core H/ACA proteins Cbf5p/dyskerin and Nhp2p, but is not a stable subunit of mature H/ACA snoRNPs, indicating a transient assembly-chaperone role; recruitment to nascent transcripts occurs through its interaction with the phosphorylated CTD of RNA polymerase II, coupling H/ACA RNP assembly to transcription [PMID:12515383]. NAF1 acts downstream of SHQ1 in a sequential, mutually exclusive assembly pathway: SHQ1 first binds dyskerin in a manner that precludes NAF1 and the other core proteins, so SHQ1 must release dyskerin before NAF1-dependent assembly can proceed [PMID:19383767]. In humans, loss-of-function frameshift mutations in NAF1 cause telomere-mediated pulmonary fibrosis-emphysema; the truncated protein lacks a conserved C-terminal motif required for nuclear localization, and NAF1 haploinsufficiency selectively reduces telomerase RNA levels and telomere length while sparing rRNA pseudouridylation [PMID:27510903]. Beyond its H/ACA role, NAF1 promotes 40S ribosomal subunit assembly and protein synthesis, and its depletion triggers ribosome stress with p53 reactivation [PMID:30936423].","teleology":[{"year":2002,"claim":"Established NAF1 as the founding H/ACA snoRNP assembly factor and defined how it is recruited and what it binds, answering how H/ACA RNPs are assembled co-transcriptionally.","evidence":"Genetic depletion in yeast, in vitro RNA binding, two-hybrid and co-precipitation showing direct binding to Cbf5p, Nhp2p and the phosphorylated Pol II CTD","pmids":["12515383"],"confidence":"High","gaps":["No structural model of the NAF1–core protein contacts","Mechanism of NAF1 release/exchange from the assembling RNP not defined","Direct demonstration that CTD binding drives recruitment in vivo not shown"]},{"year":2009,"claim":"Ordered the assembly pathway by showing SHQ1 acts upstream of NAF1 through mutually exclusive binding to dyskerin, establishing a sequential hand-off model for H/ACA RNP biogenesis.","evidence":"Human in vivo and in vitro binding assays, reconstituted NAF1-dependent H/ACA RNP assembly system, siRNA knockdown of SHQ1","pmids":["19383767"],"confidence":"High","gaps":["Trigger that releases dyskerin from SHQ1 to permit NAF1 loading not identified","Stoichiometry and timing of the NAF1-to-core-protein transition unresolved"]},{"year":2016,"claim":"Connected NAF1 to human disease and defined the C-terminal nuclear-localization motif, showing haploinsufficiency selectively limits telomerase RNA and telomere length.","evidence":"Patient mutation analysis, CRISPR/Cas9 editing in cells and mice, telomerase RNA quantification, pseudouridylation assay, C-terminal deletion localization","pmids":["27510903"],"confidence":"High","gaps":["Why telomerase RNA is more dosage-sensitive than other H/ACA RNAs not mechanistically explained","Identity of the C-terminal nuclear-targeting determinant/partner not defined"]},{"year":2019,"claim":"Extended NAF1 function beyond H/ACA assembly to 40S subunit biogenesis and protein synthesis, linking its loss to ribosome stress and p53 activation in cancer cells.","evidence":"shRNA knockdown in glioma cells, ribosome assembly and protein synthesis assays, xenografts, transcriptional regulation and p53/MDM2 pathway analysis","pmids":["30936423"],"confidence":"Medium","gaps":["Single-lab study; direct molecular role of NAF1 in 40S assembly not biochemically reconstituted","Whether 40S effect is separable from H/ACA snoRNP assembly function unclear","Transcriptional feedback loops (c-Myc, NRF2, TERT) inferred from implied ChIP/reporter, not fully detailed"]},{"year":null,"claim":"How NAF1 mechanistically distinguishes telomerase RNP assembly from other H/ACA RNPs, and how its assembly-factor role relates to its reported role in 40S biogenesis, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural basis for substrate selectivity among H/ACA RNAs","No reconstitution linking NAF1 directly to 40S subunit assembly"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,2]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2]}],"complexes":["box H/ACA snoRNP (transient assembly intermediate)","telomerase RNP (assembly intermediate)"],"partners":["CBF5/DYSKERIN","NHP2","SHQ1","RNA POLYMERASE II CTD"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96HR8","full_name":"H/ACA ribonucleoprotein complex non-core subunit NAF1","aliases":[],"length_aa":494,"mass_kda":53.7,"function":"RNA-binding protein required for the maturation of box H/ACA snoRNPs complex and ribosome biogenesis. During assembly of the H/ACA snoRNPs complex, it associates with the complex and disappears during maturation of the complex and is replaced by NOLA1/GAR1 to yield mature H/ACA snoRNPs complex. Probably competes with NOLA1/GAR1 for binding with DKC1/NOLA4","subcellular_location":"Cytoplasm; Nucleus","url":"https://www.uniprot.org/uniprotkb/Q96HR8/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/NAF1","classification":"Common Essential","n_dependent_lines":553,"n_total_lines":1208,"dependency_fraction":0.45778145695364236},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000145414","cell_line_id":"CID001114","localizations":[{"compartment":"nucleoplasm","grade":3},{"compartment":"chromatin","grade":2},{"compartment":"nucleolus_fc_dfc","grade":2},{"compartment":"nuclear_punctae","grade":1}],"interactors":[{"gene":"DKC1","stoichiometry":10.0},{"gene":"NOP10","stoichiometry":10.0}],"url":"https://opencell.sf.czbiohub.org/target/CID001114","total_profiled":1310},"omim":[{"mim_id":"620365","title":"PULMONARY FIBROSIS AND/OR BONE MARROW FAILURE SYNDROME, TELOMERE-RELATED, 7; PFBMFT7","url":"https://www.omim.org/entry/620365"},{"mim_id":"617868","title":"NUCLEAR ASSEMBLY FACTOR 1 RIBONUCLEOPROTEIN; NAF1","url":"https://www.omim.org/entry/617868"},{"mim_id":"614742","title":"PULMONARY FIBROSIS AND/OR BONE MARROW FAILURE SYNDROME, TELOMERE-RELATED, 1; PFBMFT1","url":"https://www.omim.org/entry/614742"},{"mim_id":"613663","title":"SHQ1, H/ACA RIBONUCLEOPROTEIN ASSEMBLY FACTOR; SHQ1","url":"https://www.omim.org/entry/613663"},{"mim_id":"611507","title":"CDGSH IRON SULFUR DOMAIN PROTEIN 2; CISD2","url":"https://www.omim.org/entry/611507"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NAF1"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q96HR8","domains":[{"cath_id":"2.40.10.230","chopping":"200-289","consensus_level":"high","plddt":94.6833,"start":200,"end":289}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96HR8","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96HR8-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96HR8-F1-predicted_aligned_error_v6.png","plddt_mean":61.22},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NAF1","jax_strain_url":"https://www.jax.org/strain/search?query=NAF1"},"sequence":{"accession":"Q96HR8","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96HR8.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96HR8/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96HR8"}},"corpus_meta":[{"pmid":"20010695","id":"PMC_20010695","title":"Antagonism of Beclin 1-dependent autophagy by BCL-2 at the endoplasmic reticulum requires NAF-1.","date":"2009","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/20010695","citation_count":225,"is_preprint":false},{"pmid":"23959881","id":"PMC_23959881","title":"NAF-1 and mitoNEET are central to human breast cancer proliferation by maintaining mitochondrial homeostasis and promoting tumor growth.","date":"2013","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/23959881","citation_count":172,"is_preprint":false},{"pmid":"27510903","id":"PMC_27510903","title":"Loss-of-function mutations in the RNA biogenesis factor NAF1 predispose to pulmonary fibrosis-emphysema.","date":"2016","source":"Science translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/27510903","citation_count":171,"is_preprint":false},{"pmid":"19383767","id":"PMC_19383767","title":"SHQ1 is required prior to NAF1 for assembly of H/ACA small nucleolar and telomerase RNPs.","date":"2009","source":"RNA (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/19383767","citation_count":96,"is_preprint":false},{"pmid":"22343142","id":"PMC_22343142","title":"Bcl-2-associated autophagy regulator Naf-1 required for maintenance of skeletal muscle.","date":"2012","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/22343142","citation_count":91,"is_preprint":false},{"pmid":"12515383","id":"PMC_12515383","title":"Naf1 p is a box H/ACA snoRNP assembly factor.","date":"2002","source":"RNA (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/12515383","citation_count":68,"is_preprint":false},{"pmid":"29765509","id":"PMC_29765509","title":"Resveratrol-Induced Downregulation of NAF-1 Enhances the Sensitivity of Pancreatic Cancer Cells to Gemcitabine via the ROS/Nrf2 Signaling Pathways.","date":"2018","source":"Oxidative medicine and cellular longevity","url":"https://pubmed.ncbi.nlm.nih.gov/29765509","citation_count":66,"is_preprint":false},{"pmid":"25762074","id":"PMC_25762074","title":"The Fe-S cluster-containing NEET proteins mitoNEET and NAF-1 as chemotherapeutic targets in breast cancer.","date":"2015","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/25762074","citation_count":65,"is_preprint":false},{"pmid":"9923610","id":"PMC_9923610","title":"Identification and cloning of a novel cellular protein Naf1, Nef-associated factor 1, that increases cell surface CD4 expression.","date":"1999","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/9923610","citation_count":53,"is_preprint":false},{"pmid":"24706857","id":"PMC_24706857","title":"Integrated strategy reveals the protein interface between cancer targets Bcl-2 and NAF-1.","date":"2014","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/24706857","citation_count":52,"is_preprint":false},{"pmid":"12965196","id":"PMC_12965196","title":"Identification of Naf1/ABIN-1 among TNF-alpha-induced expressed genes in human synoviocytes using oligonucleotide microarrays.","date":"2003","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/12965196","citation_count":43,"is_preprint":false},{"pmid":"23717386","id":"PMC_23717386","title":"Nutrient-deprivation autophagy factor-1 (NAF-1): biochemical properties of a novel cellular target for anti-diabetic drugs.","date":"2013","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/23717386","citation_count":41,"is_preprint":false},{"pmid":"28426722","id":"PMC_28426722","title":"Interactions between mitoNEET and NAF-1 in cells.","date":"2017","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/28426722","citation_count":40,"is_preprint":false},{"pmid":"32766132","id":"PMC_32766132","title":"NAF-1 Inhibition by Resveratrol Suppresses Cancer Stem Cell-Like Properties and the Invasion of Pancreatic Cancer.","date":"2020","source":"Frontiers in oncology","url":"https://pubmed.ncbi.nlm.nih.gov/32766132","citation_count":38,"is_preprint":false},{"pmid":"12220502","id":"PMC_12220502","title":"A new ERK2 binding protein, Naf1, attenuates the EGF/ERK2 nuclear signaling.","date":"2002","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/12220502","citation_count":32,"is_preprint":false},{"pmid":"24914968","id":"PMC_24914968","title":"A point mutation in the [2Fe-2S] cluster binding region of the NAF-1 protein (H114C) dramatically hinders the cluster donor properties.","date":"2014","source":"Acta crystallographica. Section D, Biological crystallography","url":"https://pubmed.ncbi.nlm.nih.gov/24914968","citation_count":28,"is_preprint":false},{"pmid":"14526201","id":"PMC_14526201","title":"High frequency of alternative splicing of human genes participating in the HIV-1 life cycle: a model using TSG101, betaTrCP, PPIA, INI1, NAF1, and PML.","date":"2003","source":"Journal of acquired immune deficiency syndromes (1999)","url":"https://pubmed.ncbi.nlm.nih.gov/14526201","citation_count":17,"is_preprint":false},{"pmid":"17016622","id":"PMC_17016622","title":"Multiple splicing variants of Naf1/ABIN-1 transcripts and their alterations in hematopoietic tumors.","date":"2006","source":"International journal of molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/17016622","citation_count":13,"is_preprint":false},{"pmid":"25689847","id":"PMC_25689847","title":"NAF-1 antagonizes starvation-induced autophagy through AMPK signaling pathway in cardiomyocytes.","date":"2015","source":"Cell biology international","url":"https://pubmed.ncbi.nlm.nih.gov/25689847","citation_count":13,"is_preprint":false},{"pmid":"30774867","id":"PMC_30774867","title":"The anti-apoptotic proteins NAF-1 and iASPP interact to drive apoptosis in cancer cells.","date":"2018","source":"Chemical science","url":"https://pubmed.ncbi.nlm.nih.gov/30774867","citation_count":12,"is_preprint":false},{"pmid":"30936423","id":"PMC_30936423","title":"Increased expression of NAF1 contributes to malignant phenotypes of glioma cells through promoting protein synthesis and associates with poor patient survival.","date":"2019","source":"Oncogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/30936423","citation_count":9,"is_preprint":false},{"pmid":"32333749","id":"PMC_32333749","title":"NAF1 rs4691896 Is Significantly Associated with Coal Workers' Pneumoconiosis in a Chinese Han Population: A Case-Control Study.","date":"2020","source":"Medical science monitor : international medical journal of experimental and clinical research","url":"https://pubmed.ncbi.nlm.nih.gov/32333749","citation_count":5,"is_preprint":false},{"pmid":"36067202","id":"PMC_36067202","title":"Colorectal cancer-associated SNP rs17042479 is involved in the regulation of NAF1 promoter activity.","date":"2022","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/36067202","citation_count":3,"is_preprint":false},{"pmid":"40139499","id":"PMC_40139499","title":"Host factor Naf1 restricts HIV-1 infection of myeloid cells and compromises the capacity of dendritic cell to prime CD4+ T cell.","date":"2025","source":"Virologica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/40139499","citation_count":1,"is_preprint":false},{"pmid":"16225425","id":"PMC_16225425","title":"Production and characterization of a monoclonal antibody specific to Nef-associated factor 1 (Naf1)/A20-binding inhibitor of NF-kappaB activation (ABIN-1).","date":"2005","source":"Hybridoma (2005)","url":"https://pubmed.ncbi.nlm.nih.gov/16225425","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14610,"output_tokens":2159,"usd":0.038108,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8322,"output_tokens":2252,"usd":0.048955,"stage2_stop_reason":"end_turn"},"total_usd":0.087063,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at this corpus, I need to carefully distinguish between multiple proteins sharing \"NAF1\" as a name/symbol:\n\n1. **NAF-1 / CISD2 / MINER1**: A 2Fe-2S NEET family protein at ER/mitochondrial outer membrane, involved in autophagy regulation, calcium homeostasis, BCL-2 interaction. Papers: 1, 2, 5, 7, 8, 10, 12, 13, 14, 16, 19, 20.\n\n2. **NAF1 (Nuclear Assembly Factor 1)**: A box H/ACA RNP assembly factor involved in telomerase RNA biogenesis. Papers: 3, 4, 6, 21.\n\n3. **Naf1 / ABIN-1 / TNIP1**: Nef-associated factor 1, NF-κB inhibitor. Papers: 9, 11, 15, 17, 18, 24, 25.\n\nThe query gene is \"NAF1.\" Given the corpus, the most gene-specific papers (top-ranked) are about the H/ACA RNP assembly factor NAF1 (papers 3, 4, 6, 21) and the CISD2/NAF-1 NEET protein (papers 1, 2, 5, etc.). I need to determine which is the canonical \"NAF1\" gene query. Paper [3] is titled about \"NAF1\" as a \"nuclear assembly factor 1, a box H/ACA RNA biogenesis factor\" — this is HGNC:NAF1 (gene ID for the H/ACA assembly factor). Papers about CISD2 use \"NAF-1\" as an alias/synonym. Papers about TNIP1/ABIN-1 also use \"Naf1\" as an alias.\n\nGiven the HGNC symbol NAF1 maps to the H/ACA RNP assembly factor (Nuclear Assembly Factor 1), I will focus on those. However, CISD2 papers also use NAF-1 as a primary name — these are a different gene (CISD2). The TNIP1/ABIN-1 papers are yet another gene.\n\nI'll extract discoveries for the canonical NAF1 (H/ACA assembly factor, Nuclear Assembly Factor 1) from papers 3, 4, 6, 21, and exclude the CISD2 (NAF-1/NEET) and TNIP1 (Naf1/ABIN-1) papers as alias collisions.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2002,\n      \"finding\": \"Yeast Naf1p is required for accumulation of all box H/ACA snoRNAs and functions as an H/ACA snoRNP assembly factor. Naf1p is localized to the nucleus, is not a stable component of mature H/ACA snoRNPs, shows in vitro RNA-binding activity, and directly binds the core H/ACA proteins Cbf5p and Nhp2p. Naf1p also binds the phosphorylated CTD of RNA polymerase II in vivo (two-hybrid) and in cell lysates, suggesting it is recruited to the CTD to promote co-transcriptional snoRNP assembly.\",\n      \"method\": \"Genetic depletion in yeast, in vitro RNA-binding assay, two-hybrid and co-precipitation with CTD, direct binding to Cbf5p and Nhp2p\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (genetic depletion, in vitro binding, two-hybrid, co-precipitation) in a single focused study establishing the assembly factor role\",\n      \"pmids\": [\"12515383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Human SHQ1 and NAF1 act sequentially in H/ACA RNP assembly: SHQ1 binds the core pseudouridine synthase NAP57/dyskerin both in vivo and in vitro, and this interaction precludes binding of NAF1 and other H/ACA core proteins. SHQ1 therefore acts upstream of NAF1. In an in vitro H/ACA RNP assembly system dependent on NAF1, excess recombinant SHQ1 interferes with assembly. Knockdown of SHQ1 prevents accumulation of newly synthesized H/ACA reporter RNA and reduces endogenous H/ACA RNA levels including telomerase RNA.\",\n      \"method\": \"Co-IP in vivo and in vitro binding assays, in vitro H/ACA RNP assembly system, siRNA knockdown, subcellular localization (SHQ1 excluded from Cajal bodies/nucleoli)\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — reconstituted in vitro assembly system plus reciprocal binding assays and knockdown, multiple orthogonal methods in single study\",\n      \"pmids\": [\"19383767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Loss-of-function frameshift mutations in human NAF1 (nuclear assembly factor 1) cause pulmonary fibrosis-emphysema. A truncated NAF1 lacking the conserved C-terminal motif was detected in patient cells; this C-terminal motif is required for nuclear localization of NAF1. Introduction of the frameshift mutation by CRISPR/Cas9 genome editing reduced telomerase RNA levels. Naf1(+/-) mice generated by CRISPR/Cas9 had half the normal levels of telomerase RNA; other H/ACA RNA levels were also decreased, but rRNA pseudouridylation was intact and no ribosomal pathology was found in first-generation heterozygotes. Disease in mutation carriers is telomere-mediated, with NAF1 haploinsufficiency selectively disturbing telomere length homeostasis by decreasing telomerase RNA.\",\n      \"method\": \"Patient mutation analysis, CRISPR/Cas9 genome editing (cell lines and mice), telomerase RNA quantification, pseudouridylation assay, direct nuclear localization experiment with C-terminal deletion\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — CRISPR/Cas9 editing in both cells and mice with multiple functional readouts (telomerase RNA, pseudouridylation, telomere length), multiple orthogonal methods\",\n      \"pmids\": [\"27510903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NAF1 (nuclear assembly factor 1) promotes 40S ribosomal subunit assembly and protein synthesis in glioma cells. NAF1 depletion triggers ribosome stress, impairs ribosomal biosynthesis, and reactivates p53 signaling by blocking MDM2. NAF1 transcription is regulated by c-Myc, NRF2, and TERT, forming positive feedback loops. NAF1 knockdown reduced cell growth in vitro and in vivo.\",\n      \"method\": \"shRNA knockdown, ribosome assembly assays, protein synthesis measurements, in vivo xenograft, transcriptional regulation analysis (c-Myc, NRF2, TERT ChIP/reporter implied), p53/MDM2 pathway analysis\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — single lab, functional KD with multiple readouts (ribosome assembly, p53/MDM2, in vivo tumor), but mechanistic depth depends on methods not fully detailed in abstract\",\n      \"pmids\": [\"30936423\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NAF1 (Nuclear Assembly Factor 1) is a nuclear H/ACA RNP assembly factor that is recruited co-transcriptionally via the phosphorylated CTD of RNA Pol II; it directly binds core H/ACA proteins (Cbf5p/dyskerin, Nhp2p) to promote assembly of box H/ACA snoRNPs and telomerase RNP, acting downstream of SHQ1 in a sequential quality-control assembly pathway, and its C-terminal domain is required for nuclear localization; haploinsufficiency selectively reduces telomerase RNA levels and telomere length while sparing rRNA pseudouridylation, and it additionally promotes ribosome 40S subunit assembly and protein synthesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NAF1 is a nuclear assembly factor for box H/ACA ribonucleoproteins, required for the accumulation of all H/ACA snoRNAs and for the biogenesis of the H/ACA-class telomerase RNP [#0]. It binds RNA in vitro and directly contacts the core H/ACA proteins Cbf5p/dyskerin and Nhp2p, but is not a stable subunit of mature H/ACA snoRNPs, indicating a transient assembly-chaperone role; recruitment to nascent transcripts occurs through its interaction with the phosphorylated CTD of RNA polymerase II, coupling H/ACA RNP assembly to transcription [#0]. NAF1 acts downstream of SHQ1 in a sequential, mutually exclusive assembly pathway: SHQ1 first binds dyskerin in a manner that precludes NAF1 and the other core proteins, so SHQ1 must release dyskerin before NAF1-dependent assembly can proceed [#1]. In humans, loss-of-function frameshift mutations in NAF1 cause telomere-mediated pulmonary fibrosis-emphysema; the truncated protein lacks a conserved C-terminal motif required for nuclear localization, and NAF1 haploinsufficiency selectively reduces telomerase RNA levels and telomere length while sparing rRNA pseudouridylation [#2]. Beyond its H/ACA role, NAF1 promotes 40S ribosomal subunit assembly and protein synthesis, and its depletion triggers ribosome stress with p53 reactivation [#3].\",\n  \"teleology\": [\n    {\n      \"year\": 2002,\n      \"claim\": \"Established NAF1 as the founding H/ACA snoRNP assembly factor and defined how it is recruited and what it binds, answering how H/ACA RNPs are assembled co-transcriptionally.\",\n      \"evidence\": \"Genetic depletion in yeast, in vitro RNA binding, two-hybrid and co-precipitation showing direct binding to Cbf5p, Nhp2p and the phosphorylated Pol II CTD\",\n      \"pmids\": [\"12515383\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"No structural model of the NAF1\\u2013core protein contacts\",\n        \"Mechanism of NAF1 release/exchange from the assembling RNP not defined\",\n        \"Direct demonstration that CTD binding drives recruitment in vivo not shown\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Ordered the assembly pathway by showing SHQ1 acts upstream of NAF1 through mutually exclusive binding to dyskerin, establishing a sequential hand-off model for H/ACA RNP biogenesis.\",\n      \"evidence\": \"Human in vivo and in vitro binding assays, reconstituted NAF1-dependent H/ACA RNP assembly system, siRNA knockdown of SHQ1\",\n      \"pmids\": [\"19383767\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Trigger that releases dyskerin from SHQ1 to permit NAF1 loading not identified\",\n        \"Stoichiometry and timing of the NAF1-to-core-protein transition unresolved\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Connected NAF1 to human disease and defined the C-terminal nuclear-localization motif, showing haploinsufficiency selectively limits telomerase RNA and telomere length.\",\n      \"evidence\": \"Patient mutation analysis, CRISPR/Cas9 editing in cells and mice, telomerase RNA quantification, pseudouridylation assay, C-terminal deletion localization\",\n      \"pmids\": [\"27510903\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Why telomerase RNA is more dosage-sensitive than other H/ACA RNAs not mechanistically explained\",\n        \"Identity of the C-terminal nuclear-targeting determinant/partner not defined\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended NAF1 function beyond H/ACA assembly to 40S subunit biogenesis and protein synthesis, linking its loss to ribosome stress and p53 activation in cancer cells.\",\n      \"evidence\": \"shRNA knockdown in glioma cells, ribosome assembly and protein synthesis assays, xenografts, transcriptional regulation and p53/MDM2 pathway analysis\",\n      \"pmids\": [\"30936423\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Single-lab study; direct molecular role of NAF1 in 40S assembly not biochemically reconstituted\",\n        \"Whether 40S effect is separable from H/ACA snoRNP assembly function unclear\",\n        \"Transcriptional feedback loops (c-Myc, NRF2, TERT) inferred from implied ChIP/reporter, not fully detailed\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How NAF1 mechanistically distinguishes telomerase RNP assembly from other H/ACA RNPs, and how its assembly-factor role relates to its reported role in 40S biogenesis, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No structural basis for substrate selectivity among H/ACA RNAs\",\n        \"No reconstitution linking NAF1 directly to 40S subunit assembly\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\n      \"box H/ACA snoRNP (transient assembly intermediate)\",\n      \"telomerase RNP (assembly intermediate)\"\n    ],\n    \"partners\": [\n      \"CBF5/dyskerin\",\n      \"NHP2\",\n      \"SHQ1\",\n      \"RNA polymerase II CTD\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}