{"gene":"NME5","run_date":"2026-04-29T11:37:57","timeline":{"discoveries":[{"year":1998,"finding":"NME5 (Nm23-H5) was identified as a new member of the nm23/NDP kinase gene family, specifically and highly expressed in testis spermatogonia and early spermatocytes. The recombinant protein expressed in E. coli did not exhibit NDP kinase activity under standard assay conditions, suggesting it lacks canonical enzymatic activity despite possessing conserved NDP kinase residues plus a unique 55-amino acid C-terminal extension.","method":"cDNA cloning, Northern blot, in situ hybridization, heterologous expression in E. coli with NDP kinase activity assay","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 1 — original discovery with direct enzymatic assay showing absence of NDPK activity; foundational paper with 98 citations","pmids":["9742940"],"is_preprint":false},{"year":2003,"finding":"Nm23-H5 protein localizes to the flagella of spermatids and spermatozoa, adjacent to the central pair and outer doublets of axonemal microtubules, implicating it in the phosphotransfer network for flagellar movement.","method":"Immunohistochemistry, immunofluorescence microscopy, Western blotting of sperm extracts","journal":"Experimental cell research","confidence":"High","confidence_rationale":"Tier 2 — direct localization by immunofluorescence with functional context; replicated in multiple cell types","pmids":["14499630"],"is_preprint":false},{"year":2003,"finding":"Murine Nm23-M5 (ortholog of NME5) is expressed in late spermatids and overexpression in fibroblasts protects against Bax-induced apoptosis by elevating antioxidant enzymes, particularly glutathione peroxidase 5 (GPX-5), reducing reactive oxygen species.","method":"Heterologous yeast expression, overexpression in fibroblasts, antioxidant enzyme activity assays, RT-PCR, in situ hybridization","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — functional overexpression with specific enzymatic readout, but single lab","pmids":["12788088"],"is_preprint":false},{"year":2009,"finding":"Knockdown of Nm23-M5 in transgenic mice using shRNA reduced haploid cell numbers during spermiogenesis and decreased GPX-5 expression and activity, establishing that NME5 regulates spermatid survival through control of GPX-5 levels to eliminate reactive oxygen species.","method":"shRNA transgenic mouse knockdown, Northern blot, Western blot, GPX-5 activity assay","journal":"FEBS letters","confidence":"High","confidence_rationale":"Tier 2 — in vivo loss-of-function with defined cellular phenotype and molecular mechanism; moderate evidence from single lab with multiple orthogonal methods","pmids":["19303412"],"is_preprint":false},{"year":2011,"finding":"Nme5 knockout mice develop congenital hydrocephalus, and the underlying pathogenetic mechanism is dysfunctional motile cilia, as determined by pathological analysis of the genetically engineered mouse lines.","method":"Knockout mouse generation, veterinary pathological analysis, cilia functional assessment","journal":"Veterinary pathology","confidence":"High","confidence_rationale":"Tier 2 — clean knockout with defined ciliary phenotype; replicated across multiple cilia-related gene knockouts in same study","pmids":["21746835"],"is_preprint":false},{"year":2012,"finding":"NME5 contributes to innate gemcitabine resistance in pancreatic cancer cells by attenuating apoptosis and cell cycle arrest; NME5 was shown to directly bind NF-κB and regulate its expression, operating in an NF-κB-dependent manner.","method":"siRNA knockdown, overexpression, apoptosis assays, cell cycle analysis, co-immunoprecipitation (NME5-NF-κB binding), gene arrays","journal":"The FEBS journal","confidence":"Medium","confidence_rationale":"Tier 3 — Co-IP for NF-κB binding plus functional KD/OE with phenotype, single lab","pmids":["22325559"],"is_preprint":false},{"year":2012,"finding":"The NME5 promoter was characterized: the transcription start site is at -35 bp relative to the ATG, and two GC-boxes at -300 bp and -323 bp are required for promoter activity. Transcription factor Sp1 binds these GC-boxes and transactivates NME5 expression.","method":"5' deletion analysis, EMSA, ChIP, Sp1 overexpression, promoter-reporter assays","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 — EMSA and ChIP provide direct evidence of Sp1 binding; moderate evidence from single lab","pmids":["22564704"],"is_preprint":false},{"year":2017,"finding":"NME5 (along with NME1, NME7, and NME8) exhibits a 3'-5' exonuclease activity, suggesting a role in DNA proofreading and repair within the NME family.","method":"Review citing biochemical activity data for NME family members","journal":"Laboratory investigation","confidence":"Low","confidence_rationale":"Tier 4 — review summary without primary experimental data in this paper","pmids":["29058704"],"is_preprint":false},{"year":2019,"finding":"A frameshift variant (c.43delA) in NME5 causes primary ciliary dyskinesia in Alaskan Malamute dogs, with immunohistochemistry demonstrating complete absence of NME5 protein from nasal epithelia of affected animals; Nme5-/- knockout mice exhibit hydrocephalus and sperm flagellar defects.","method":"Whole genome sequencing, linkage/homozygosity mapping, immunohistochemistry, knockout mouse phenotyping","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 — protein absence confirmed by IHC; genotype-phenotype co-segregation plus knockout mouse data; independently supported by Cho et al. 2020","pmids":["31479451"],"is_preprint":false},{"year":2020,"finding":"A homozygous nonsense variant (c.572G>A; p.Trp191*) in NME5 causes human primary ciliary dyskinesia with radial spoke and central pair defects; morpholino knockdown of nme5 in zebrafish embryos reproduced motile cilia defects, establishing NME5 as a PCD-causative gene in humans.","method":"Whole exome sequencing, morpholino knockdown in zebrafish, cilia phenotype analysis","journal":"Clinical genetics","confidence":"High","confidence_rationale":"Tier 2 — human genetics combined with vertebrate model organism loss-of-function; replicated by Anderegg et al. 2019","pmids":["32185794"],"is_preprint":false},{"year":2025,"finding":"A homozygous frameshift variant in NME5 (c.163delA) causes acephalic spermatozoa syndrome (ASS) with complete loss of NME5 protein; ultrastructural analysis showed abnormalities in the head-tail coupling apparatus (HTCA), mitochondrial sheath, radial spokes, and microtubules; SPATA6 (HTCA marker) was nearly absent from patient sperm; NME5 is predominantly expressed from round to elongated spermatids.","method":"Whole exome sequencing, immunofluorescence, transmission electron microscopy, Western blot, expression profiling","journal":"Clinical genetics","confidence":"Medium","confidence_rationale":"Tier 2 — human loss-of-function with multiple orthogonal structural and molecular readouts; single lab","pmids":["41499646"],"is_preprint":false},{"year":2025,"finding":"NME5 is a component of the radial spoke 1 (RS1) head-neck complex in sperm flagella, assembling together with DYDC1, DNAJB13, and PPIL6 into this structural unit; loss of RS1 (but not RS2 or RS3) accompanies IQUB deficiency, and NME5 was identified by protein mass spectrometry as a critical RS1 component in humans and mice.","method":"Protein mass spectrometry, Western blot, immunofluorescence, electron microscopy, bioinformatic structural modeling, Iqub-/- mice","journal":"Cell communication and signaling","confidence":"Medium","confidence_rationale":"Tier 2 — mass spectrometry identification plus structural/functional context; single study but multiple orthogonal methods","pmids":["39849482"],"is_preprint":false}],"current_model":"NME5 is a catalytically inactive member of the NDP kinase family (Group II NME) that localizes to the axonemal structure of motile cilia and sperm flagella, where it functions as a structural component of the radial spoke 1 (RS1) head-neck complex; loss of NME5 causes primary ciliary dyskinesia with radial spoke/central pair defects and hydrocephalus, while in spermatogenesis it regulates late spermatid survival by upregulating the antioxidant enzyme GPX-5 to eliminate reactive oxygen species, and its transcription is driven by Sp1 through two GC-box elements in its proximal promoter."},"narrative":{"teleology":[{"year":1998,"claim":"Identification of NME5 as a novel NDP kinase family member that lacks canonical enzymatic activity established it as a divergent, potentially non-catalytic member of the NME family with testis-specific expression.","evidence":"cDNA cloning, Northern blot, in situ hybridization, and recombinant protein NDPK activity assay in E. coli","pmids":["9742940"],"confidence":"High","gaps":["No structural basis for why NDPK activity is absent","Function of the unique 55-amino acid C-terminal extension unknown"]},{"year":2003,"claim":"Localization of NME5 to the sperm flagellar axoneme and demonstration that it protects against apoptosis by upregulating GPX-5 linked a non-catalytic NDP kinase family member to both flagellar structure and redox-dependent spermatid survival.","evidence":"Immunofluorescence of sperm flagella (PMID:14499630); overexpression in fibroblasts with GPX-5 activity assays and Bax-induced apoptosis protection (PMID:12788088)","pmids":["14499630","12788088"],"confidence":"High","gaps":["Mechanism by which NME5 upregulates GPX-5 not determined","Whether NME5 has a direct structural role in the axoneme vs. indirect role unclear"]},{"year":2009,"claim":"In vivo knockdown in transgenic mice confirmed that NME5 is required for spermatid survival and that this function operates through GPX-5-mediated ROS elimination, establishing a causal loss-of-function relationship.","evidence":"shRNA transgenic mouse with reduced haploid cell numbers, decreased GPX-5 expression and activity","pmids":["19303412"],"confidence":"High","gaps":["Transcriptional vs. post-transcriptional mechanism of GPX-5 regulation not resolved","Whether NME5 directly binds GPX-5 promoter or acts through intermediaries unknown"]},{"year":2011,"claim":"Nme5 knockout mice developing hydrocephalus from dysfunctional motile cilia extended NME5's role beyond spermatogenesis to general motile cilia function.","evidence":"Knockout mouse generation with veterinary pathological analysis of cilia","pmids":["21746835"],"confidence":"High","gaps":["Specific ciliary ultrastructural defect not characterized","Whether hydrocephalus reflects ependymal cilia or other motile cilia dysfunction not distinguished"]},{"year":2012,"claim":"Characterization of the NME5 promoter identified Sp1 as the key transcriptional activator acting through two GC-boxes, providing a regulatory framework for tissue-specific expression; separately, NME5 was implicated in gemcitabine resistance via NF-κB binding in pancreatic cancer cells.","evidence":"EMSA, ChIP, and promoter-reporter assays for Sp1 (PMID:22564704); Co-IP, siRNA, and overexpression with apoptosis/cell cycle assays for NF-κB interaction (PMID:22325559)","pmids":["22564704","22325559"],"confidence":"Medium","gaps":["NF-κB interaction identified by single Co-IP without reciprocal validation","How Sp1-driven transcription achieves testis-enriched expression not explained","Cancer role not independently replicated"]},{"year":2019,"claim":"A frameshift variant in NME5 causing primary ciliary dyskinesia in dogs, with confirmed absence of protein by IHC, established NME5 as a bona fide PCD gene across species.","evidence":"Whole genome sequencing, linkage/homozygosity mapping, immunohistochemistry in Alaskan Malamute dogs; corroborated by Nme5-/- mouse phenotype","pmids":["31479451"],"confidence":"High","gaps":["Whether NME5 loss affects specific axonemal substructures (e.g., radial spokes) not yet determined in this model"]},{"year":2020,"claim":"Identification of a human nonsense NME5 variant causing PCD with radial spoke and central pair defects, validated by zebrafish morpholino, confirmed NME5 as a human PCD-causative gene and localized its structural requirement to the RS/CP apparatus.","evidence":"Whole exome sequencing in human family, morpholino knockdown in zebrafish with cilia phenotype analysis","pmids":["32185794"],"confidence":"High","gaps":["Precise position of NME5 within the radial spoke complex not determined","Rescue experiment not performed"]},{"year":2025,"claim":"NME5 was placed within the RS1 head-neck complex alongside DYDC1, DNAJB13, and PPIL6, while separately a human frameshift variant revealed that NME5 loss causes acephalic spermatozoa with disrupted HTCA and mitochondrial sheath, broadening the phenotypic spectrum of NME5 deficiency.","evidence":"Protein mass spectrometry, electron microscopy, and immunofluorescence in Iqub-/- mice and human sperm (PMID:39849482); WES, TEM, and immunofluorescence in human ASS patients (PMID:41499646)","pmids":["39849482","41499646"],"confidence":"Medium","gaps":["Direct protein-protein interactions between NME5 and other RS1 components not biochemically validated","How NME5 contributes to HTCA integrity vs. flagellar radial spoke assembly is unclear","No structural model of NME5 within the RS1 complex"]},{"year":null,"claim":"The precise molecular function of NME5 within the RS1 complex — whether it acts as a scaffold, adaptor, or has an unrecognized enzymatic activity — and the mechanism by which it regulates GPX-5 expression remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No crystal or cryo-EM structure of NME5 or the RS1 head-neck complex","Mechanism linking NME5 to GPX-5 transcriptional regulation not defined","Whether NME5 has any catalytic activity (e.g., exonuclease) remains unconfirmed by primary data"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[1,11]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[1,8,9,11]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[1,11]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[4,8,9,11]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[0,3,10]}],"complexes":["Radial spoke 1 (RS1) head-neck complex"],"partners":["DYDC1","DNAJB13","PPIL6","GPX5","SP1"],"other_free_text":[]},"mechanistic_narrative":"NME5 is a catalytically inactive member of the NDP kinase family that functions as a structural component of motile cilia and sperm flagella, where it assembles into the radial spoke 1 (RS1) head-neck complex together with DYDC1, DNAJB13, and PPIL6 [PMID:39849482]. Loss-of-function mutations in NME5 cause primary ciliary dyskinesia with radial spoke and central pair defects in humans and dogs, and hydrocephalus in knockout mice [PMID:32185794, PMID:31479451, PMID:21746835]. In spermatogenesis, NME5 is expressed from spermatogonia through elongated spermatids, localizes to the flagellar axoneme, and regulates late spermatid survival by upregulating the antioxidant enzyme GPX-5 to eliminate reactive oxygen species; complete loss of NME5 causes acephalic spermatozoa with disrupted head-tail coupling apparatus and radial spoke defects [PMID:19303412, PMID:41499646]. Transcription of NME5 is driven by Sp1 binding to two GC-box elements in its proximal promoter [PMID:22564704]."},"prefetch_data":{"uniprot":{"accession":"P56597","full_name":"Nucleoside diphosphate kinase 5","aliases":["Inhibitor of p53-induced apoptosis-beta","IPIA-beta","Putative 3'-5'-DNA exonuclease NDK5","Radial spoke head protein 23 homolog","Testis-specific nm23 homolog","nm23-H5"],"length_aa":212,"mass_kda":24.2,"function":"Functions as part of axonemal radial spoke complexes, which play an important part in the motility of sperm and cilia (By similarity). In vitro, does not display nucleoside diphosphate kinase (NDPK) activity (Probable) (PubMed:16313181, PubMed:9742940). Exhibits a 3'-5'-DNA exonuclease activity that removes single nucleotides from the 3' terminus of single-stranded DNA substrates and digests overhanging mismatched 3' termini from double-stranded DNA substrates, possibly participating in DNA nucleolytic processing (PubMed:16313181). Confers protection from cell death mediated by BAX and alters the cellular levels of several antioxidant enzymes, including GPX5 (By similarity). Might be involved in spermiogenesis by enhancing the ability of late-stage spermatids to eliminate reactive oxygen species (By similarity)","subcellular_location":"Cell projection, cilium; Cytoplasm, cytoskeleton, flagellum axoneme","url":"https://www.uniprot.org/uniprotkb/P56597/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NME5","classification":"Not Classified","n_dependent_lines":17,"n_total_lines":1208,"dependency_fraction":0.014072847682119206},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NME5","total_profiled":1310},"omim":[{"mim_id":"620032","title":"CILIARY DYSKINESIA, PRIMARY, 48, WITHOUT SITUS INVERSUS; CILD48","url":"https://www.omim.org/entry/620032"},{"mim_id":"615876","title":"RADIAL SPOKE HEAD 3; RSPH3","url":"https://www.omim.org/entry/615876"},{"mim_id":"603575","title":"NME/NM23 FAMILY, MEMBER 5; NME5","url":"https://www.omim.org/entry/603575"},{"mim_id":"244400","title":"CILIARY DYSKINESIA, PRIMARY, 1; CILD1","url":"https://www.omim.org/entry/244400"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Cytosol","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"},{"location":"Primary cilium","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"fallopian tube","ntpm":35.0},{"tissue":"testis","ntpm":49.8}],"url":"https://www.proteinatlas.org/search/NME5"},"hgnc":{"alias_symbol":["nm23-H5","RSPH23"],"prev_symbol":[]},"alphafold":{"accession":"P56597","domains":[{"cath_id":"3.30.70.141","chopping":"13-141","consensus_level":"high","plddt":96.4845,"start":13,"end":141},{"cath_id":"1.20.890","chopping":"153-194","consensus_level":"high","plddt":94.5571,"start":153,"end":194}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P56597","model_url":"https://alphafold.ebi.ac.uk/files/AF-P56597-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P56597-F1-predicted_aligned_error_v6.png","plddt_mean":90.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NME5","jax_strain_url":"https://www.jax.org/strain/search?query=NME5"},"sequence":{"accession":"P56597","fasta_url":"https://rest.uniprot.org/uniprotkb/P56597.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P56597/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P56597"}},"corpus_meta":[{"pmid":"25311278","id":"PMC_25311278","title":"Deregulation of purine metabolism in Alzheimer's disease.","date":"2014","source":"Neurobiology of aging","url":"https://pubmed.ncbi.nlm.nih.gov/25311278","citation_count":130,"is_preprint":false},{"pmid":"24424412","id":"PMC_24424412","title":"Coordinated genomic control of ciliogenesis and cell movement by RFX2.","date":"2014","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/24424412","citation_count":119,"is_preprint":false},{"pmid":"21746835","id":"PMC_21746835","title":"Congenital hydrocephalus in genetically engineered mice.","date":"2011","source":"Veterinary pathology","url":"https://pubmed.ncbi.nlm.nih.gov/21746835","citation_count":115,"is_preprint":false},{"pmid":"9742940","id":"PMC_9742940","title":"A new human nm23 homologue (nm23-H5) specifically expressed in testis germinal cells.","date":"1998","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/9742940","citation_count":98,"is_preprint":false},{"pmid":"19852809","id":"PMC_19852809","title":"Nme protein family evolutionary history, a vertebrate perspective.","date":"2009","source":"BMC evolutionary biology","url":"https://pubmed.ncbi.nlm.nih.gov/19852809","citation_count":98,"is_preprint":false},{"pmid":"26073779","id":"PMC_26073779","title":"RSPH3 Mutations Cause Primary Ciliary Dyskinesia with Central-Complex Defects and a Near Absence of Radial Spokes.","date":"2015","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26073779","citation_count":72,"is_preprint":false},{"pmid":"25597950","id":"PMC_25597950","title":"Purine metabolism gene deregulation in Parkinson's disease.","date":"2015","source":"Neuropathology and applied neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/25597950","citation_count":66,"is_preprint":false},{"pmid":"22974127","id":"PMC_22974127","title":"Simultaneous modulation of the intrinsic and extrinsic pathways by simvastatin in mediating prostate cancer cell apoptosis.","date":"2012","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/22974127","citation_count":65,"is_preprint":false},{"pmid":"29058704","id":"PMC_29058704","title":"Nuclear functions of NME proteins.","date":"2017","source":"Laboratory investigation; 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genetics","url":"https://pubmed.ncbi.nlm.nih.gov/41499646","citation_count":0,"is_preprint":false},{"pmid":"41459856","id":"PMC_41459856","title":"In Silico Analysis of the Role of Estrogen Signaling in the Expression of Metabolic Genes in Breast Cancer.","date":"2025","source":"Asian Pacific journal of cancer prevention : APJCP","url":"https://pubmed.ncbi.nlm.nih.gov/41459856","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.05.09.593462","title":"Construction of a breast cancer predictive nomogram based on diverse cell death methods and reveal tumor microenvironment characterization","date":"2024-05-14","source":"bioRxiv","url":"https://doi.org/10.1101/2024.05.09.593462","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":20555,"output_tokens":2731,"usd":0.051315},"stage2":{"model":"claude-opus-4-6","input_tokens":6086,"output_tokens":2368,"usd":0.134445},"total_usd":0.18576,"stage1_batch_id":"msgbatch_012ZiiCUBfB62NCTQd4Bk1Jo","stage2_batch_id":"msgbatch_01Xuqq9aUHoQouS7UVGZNStZ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"NME5 (Nm23-H5) was identified as a new member of the nm23/NDP kinase gene family, specifically and highly expressed in testis spermatogonia and early spermatocytes. The recombinant protein expressed in E. coli did not exhibit NDP kinase activity under standard assay conditions, suggesting it lacks canonical enzymatic activity despite possessing conserved NDP kinase residues plus a unique 55-amino acid C-terminal extension.\",\n      \"method\": \"cDNA cloning, Northern blot, in situ hybridization, heterologous expression in E. coli with NDP kinase activity assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original discovery with direct enzymatic assay showing absence of NDPK activity; foundational paper with 98 citations\",\n      \"pmids\": [\"9742940\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Nm23-H5 protein localizes to the flagella of spermatids and spermatozoa, adjacent to the central pair and outer doublets of axonemal microtubules, implicating it in the phosphotransfer network for flagellar movement.\",\n      \"method\": \"Immunohistochemistry, immunofluorescence microscopy, Western blotting of sperm extracts\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization by immunofluorescence with functional context; replicated in multiple cell types\",\n      \"pmids\": [\"14499630\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Murine Nm23-M5 (ortholog of NME5) is expressed in late spermatids and overexpression in fibroblasts protects against Bax-induced apoptosis by elevating antioxidant enzymes, particularly glutathione peroxidase 5 (GPX-5), reducing reactive oxygen species.\",\n      \"method\": \"Heterologous yeast expression, overexpression in fibroblasts, antioxidant enzyme activity assays, RT-PCR, in situ hybridization\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional overexpression with specific enzymatic readout, but single lab\",\n      \"pmids\": [\"12788088\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Knockdown of Nm23-M5 in transgenic mice using shRNA reduced haploid cell numbers during spermiogenesis and decreased GPX-5 expression and activity, establishing that NME5 regulates spermatid survival through control of GPX-5 levels to eliminate reactive oxygen species.\",\n      \"method\": \"shRNA transgenic mouse knockdown, Northern blot, Western blot, GPX-5 activity assay\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo loss-of-function with defined cellular phenotype and molecular mechanism; moderate evidence from single lab with multiple orthogonal methods\",\n      \"pmids\": [\"19303412\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Nme5 knockout mice develop congenital hydrocephalus, and the underlying pathogenetic mechanism is dysfunctional motile cilia, as determined by pathological analysis of the genetically engineered mouse lines.\",\n      \"method\": \"Knockout mouse generation, veterinary pathological analysis, cilia functional assessment\",\n      \"journal\": \"Veterinary pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean knockout with defined ciliary phenotype; replicated across multiple cilia-related gene knockouts in same study\",\n      \"pmids\": [\"21746835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"NME5 contributes to innate gemcitabine resistance in pancreatic cancer cells by attenuating apoptosis and cell cycle arrest; NME5 was shown to directly bind NF-κB and regulate its expression, operating in an NF-κB-dependent manner.\",\n      \"method\": \"siRNA knockdown, overexpression, apoptosis assays, cell cycle analysis, co-immunoprecipitation (NME5-NF-κB binding), gene arrays\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — Co-IP for NF-κB binding plus functional KD/OE with phenotype, single lab\",\n      \"pmids\": [\"22325559\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"The NME5 promoter was characterized: the transcription start site is at -35 bp relative to the ATG, and two GC-boxes at -300 bp and -323 bp are required for promoter activity. Transcription factor Sp1 binds these GC-boxes and transactivates NME5 expression.\",\n      \"method\": \"5' deletion analysis, EMSA, ChIP, Sp1 overexpression, promoter-reporter assays\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — EMSA and ChIP provide direct evidence of Sp1 binding; moderate evidence from single lab\",\n      \"pmids\": [\"22564704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"NME5 (along with NME1, NME7, and NME8) exhibits a 3'-5' exonuclease activity, suggesting a role in DNA proofreading and repair within the NME family.\",\n      \"method\": \"Review citing biochemical activity data for NME family members\",\n      \"journal\": \"Laboratory investigation\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 — review summary without primary experimental data in this paper\",\n      \"pmids\": [\"29058704\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A frameshift variant (c.43delA) in NME5 causes primary ciliary dyskinesia in Alaskan Malamute dogs, with immunohistochemistry demonstrating complete absence of NME5 protein from nasal epithelia of affected animals; Nme5-/- knockout mice exhibit hydrocephalus and sperm flagellar defects.\",\n      \"method\": \"Whole genome sequencing, linkage/homozygosity mapping, immunohistochemistry, knockout mouse phenotyping\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — protein absence confirmed by IHC; genotype-phenotype co-segregation plus knockout mouse data; independently supported by Cho et al. 2020\",\n      \"pmids\": [\"31479451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A homozygous nonsense variant (c.572G>A; p.Trp191*) in NME5 causes human primary ciliary dyskinesia with radial spoke and central pair defects; morpholino knockdown of nme5 in zebrafish embryos reproduced motile cilia defects, establishing NME5 as a PCD-causative gene in humans.\",\n      \"method\": \"Whole exome sequencing, morpholino knockdown in zebrafish, cilia phenotype analysis\",\n      \"journal\": \"Clinical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — human genetics combined with vertebrate model organism loss-of-function; replicated by Anderegg et al. 2019\",\n      \"pmids\": [\"32185794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A homozygous frameshift variant in NME5 (c.163delA) causes acephalic spermatozoa syndrome (ASS) with complete loss of NME5 protein; ultrastructural analysis showed abnormalities in the head-tail coupling apparatus (HTCA), mitochondrial sheath, radial spokes, and microtubules; SPATA6 (HTCA marker) was nearly absent from patient sperm; NME5 is predominantly expressed from round to elongated spermatids.\",\n      \"method\": \"Whole exome sequencing, immunofluorescence, transmission electron microscopy, Western blot, expression profiling\",\n      \"journal\": \"Clinical genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — human loss-of-function with multiple orthogonal structural and molecular readouts; single lab\",\n      \"pmids\": [\"41499646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NME5 is a component of the radial spoke 1 (RS1) head-neck complex in sperm flagella, assembling together with DYDC1, DNAJB13, and PPIL6 into this structural unit; loss of RS1 (but not RS2 or RS3) accompanies IQUB deficiency, and NME5 was identified by protein mass spectrometry as a critical RS1 component in humans and mice.\",\n      \"method\": \"Protein mass spectrometry, Western blot, immunofluorescence, electron microscopy, bioinformatic structural modeling, Iqub-/- mice\",\n      \"journal\": \"Cell communication and signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mass spectrometry identification plus structural/functional context; single study but multiple orthogonal methods\",\n      \"pmids\": [\"39849482\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NME5 is a catalytically inactive member of the NDP kinase family (Group II NME) that localizes to the axonemal structure of motile cilia and sperm flagella, where it functions as a structural component of the radial spoke 1 (RS1) head-neck complex; loss of NME5 causes primary ciliary dyskinesia with radial spoke/central pair defects and hydrocephalus, while in spermatogenesis it regulates late spermatid survival by upregulating the antioxidant enzyme GPX-5 to eliminate reactive oxygen species, and its transcription is driven by Sp1 through two GC-box elements in its proximal promoter.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"NME5 is a catalytically inactive member of the NDP kinase family that functions as a structural component of motile cilia and sperm flagella, where it assembles into the radial spoke 1 (RS1) head-neck complex together with DYDC1, DNAJB13, and PPIL6 [PMID:39849482]. Loss-of-function mutations in NME5 cause primary ciliary dyskinesia with radial spoke and central pair defects in humans and dogs, and hydrocephalus in knockout mice [PMID:32185794, PMID:31479451, PMID:21746835]. In spermatogenesis, NME5 is expressed from spermatogonia through elongated spermatids, localizes to the flagellar axoneme, and regulates late spermatid survival by upregulating the antioxidant enzyme GPX-5 to eliminate reactive oxygen species; complete loss of NME5 causes acephalic spermatozoa with disrupted head-tail coupling apparatus and radial spoke defects [PMID:19303412, PMID:41499646]. Transcription of NME5 is driven by Sp1 binding to two GC-box elements in its proximal promoter [PMID:22564704].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of NME5 as a novel NDP kinase family member that lacks canonical enzymatic activity established it as a divergent, potentially non-catalytic member of the NME family with testis-specific expression.\",\n      \"evidence\": \"cDNA cloning, Northern blot, in situ hybridization, and recombinant protein NDPK activity assay in E. coli\",\n      \"pmids\": [\"9742940\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural basis for why NDPK activity is absent\", \"Function of the unique 55-amino acid C-terminal extension unknown\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Localization of NME5 to the sperm flagellar axoneme and demonstration that it protects against apoptosis by upregulating GPX-5 linked a non-catalytic NDP kinase family member to both flagellar structure and redox-dependent spermatid survival.\",\n      \"evidence\": \"Immunofluorescence of sperm flagella (PMID:14499630); overexpression in fibroblasts with GPX-5 activity assays and Bax-induced apoptosis protection (PMID:12788088)\",\n      \"pmids\": [\"14499630\", \"12788088\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which NME5 upregulates GPX-5 not determined\", \"Whether NME5 has a direct structural role in the axoneme vs. indirect role unclear\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"In vivo knockdown in transgenic mice confirmed that NME5 is required for spermatid survival and that this function operates through GPX-5-mediated ROS elimination, establishing a causal loss-of-function relationship.\",\n      \"evidence\": \"shRNA transgenic mouse with reduced haploid cell numbers, decreased GPX-5 expression and activity\",\n      \"pmids\": [\"19303412\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Transcriptional vs. post-transcriptional mechanism of GPX-5 regulation not resolved\", \"Whether NME5 directly binds GPX-5 promoter or acts through intermediaries unknown\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Nme5 knockout mice developing hydrocephalus from dysfunctional motile cilia extended NME5's role beyond spermatogenesis to general motile cilia function.\",\n      \"evidence\": \"Knockout mouse generation with veterinary pathological analysis of cilia\",\n      \"pmids\": [\"21746835\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific ciliary ultrastructural defect not characterized\", \"Whether hydrocephalus reflects ependymal cilia or other motile cilia dysfunction not distinguished\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Characterization of the NME5 promoter identified Sp1 as the key transcriptional activator acting through two GC-boxes, providing a regulatory framework for tissue-specific expression; separately, NME5 was implicated in gemcitabine resistance via NF-κB binding in pancreatic cancer cells.\",\n      \"evidence\": \"EMSA, ChIP, and promoter-reporter assays for Sp1 (PMID:22564704); Co-IP, siRNA, and overexpression with apoptosis/cell cycle assays for NF-κB interaction (PMID:22325559)\",\n      \"pmids\": [\"22564704\", \"22325559\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"NF-κB interaction identified by single Co-IP without reciprocal validation\", \"How Sp1-driven transcription achieves testis-enriched expression not explained\", \"Cancer role not independently replicated\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"A frameshift variant in NME5 causing primary ciliary dyskinesia in dogs, with confirmed absence of protein by IHC, established NME5 as a bona fide PCD gene across species.\",\n      \"evidence\": \"Whole genome sequencing, linkage/homozygosity mapping, immunohistochemistry in Alaskan Malamute dogs; corroborated by Nme5-/- mouse phenotype\",\n      \"pmids\": [\"31479451\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether NME5 loss affects specific axonemal substructures (e.g., radial spokes) not yet determined in this model\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identification of a human nonsense NME5 variant causing PCD with radial spoke and central pair defects, validated by zebrafish morpholino, confirmed NME5 as a human PCD-causative gene and localized its structural requirement to the RS/CP apparatus.\",\n      \"evidence\": \"Whole exome sequencing in human family, morpholino knockdown in zebrafish with cilia phenotype analysis\",\n      \"pmids\": [\"32185794\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise position of NME5 within the radial spoke complex not determined\", \"Rescue experiment not performed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"NME5 was placed within the RS1 head-neck complex alongside DYDC1, DNAJB13, and PPIL6, while separately a human frameshift variant revealed that NME5 loss causes acephalic spermatozoa with disrupted HTCA and mitochondrial sheath, broadening the phenotypic spectrum of NME5 deficiency.\",\n      \"evidence\": \"Protein mass spectrometry, electron microscopy, and immunofluorescence in Iqub-/- mice and human sperm (PMID:39849482); WES, TEM, and immunofluorescence in human ASS patients (PMID:41499646)\",\n      \"pmids\": [\"39849482\", \"41499646\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct protein-protein interactions between NME5 and other RS1 components not biochemically validated\", \"How NME5 contributes to HTCA integrity vs. flagellar radial spoke assembly is unclear\", \"No structural model of NME5 within the RS1 complex\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The precise molecular function of NME5 within the RS1 complex — whether it acts as a scaffold, adaptor, or has an unrecognized enzymatic activity — and the mechanism by which it regulates GPX-5 expression remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No crystal or cryo-EM structure of NME5 or the RS1 head-neck complex\", \"Mechanism linking NME5 to GPX-5 transcriptional regulation not defined\", \"Whether NME5 has any catalytic activity (e.g., exonuclease) remains unconfirmed by primary data\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [1, 11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [1, 8, 9, 11]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [1, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [4, 8, 9, 11]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [0, 3, 10]}\n    ],\n    \"complexes\": [\n      \"Radial spoke 1 (RS1) head-neck complex\"\n    ],\n    \"partners\": [\n      \"DYDC1\",\n      \"DNAJB13\",\n      \"PPIL6\",\n      \"GPX5\",\n      \"SP1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}