{"gene":"SPAG9","run_date":"2026-04-28T20:42:08","timeline":{"discoveries":[{"year":2005,"finding":"SPAG9 protein contains a JNK-binding domain and interacts preferentially with JNK3 and JNK2 over JNK1, with no interaction detected with p38α or ERK pathways. Both the leucine zipper/coiled-coil domains and the transmembrane domain are required for dimerization and proper subcellular localization.","method":"Co-immunoprecipitation, deletion mutant transfection, CD spectroscopy, tandem MS, indirect immunofluorescence","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1–2 — multiple orthogonal methods (Co-IP, domain deletion mutants, structural analysis) in a single rigorous study establishing JNK binding specificity and domain requirements","pmids":["15693750"],"is_preprint":false},{"year":2005,"finding":"SPAG9 protein localizes to the acrosomal compartment of intact human spermatozoa and relocates to the equatorial segment after the acrosome reaction; anti-SPAG9 antibodies inhibit sperm binding to intact human oocytes and hemizonae.","method":"Indirect immunofluorescence, Western blot of sperm extracts, hemizona binding assay","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 — direct localization experiment with functional consequence (inhibition of sperm-egg binding), replicated in multiple primate species","pmids":["15693750","16143403","15293220"],"is_preprint":false},{"year":2009,"finding":"siRNA-mediated knockdown of SPAG9 in SiHa cervical squamous cell carcinoma cells inhibits cell growth, colony formation, migration, and invasion in vitro, and significantly suppresses tumor growth in a cervical cancer xenograft model in nude mice.","method":"Plasmid-based siRNA knockdown, colony formation assay, migration/invasion assays, xenograft tumor model","journal":"Cancer","confidence":"Medium","confidence_rationale":"Tier 2 — clean KO with defined cellular and in vivo phenotypic readout, single lab","pmids":["19813278"],"is_preprint":false},{"year":2013,"finding":"SPAG9 knockdown in non-small cell lung cancer cells inhibits cell growth and invasion and is accompanied by downregulation of MMP9 mRNA/protein and inhibition of JNK phosphorylation, placing SPAG9 upstream of JNK activation and MMP9 expression.","method":"siRNA knockdown, Western blot, RT-PCR, cell growth and invasion assays","journal":"Lung cancer (Amsterdam, Netherlands)","confidence":"Medium","confidence_rationale":"Tier 2–3 — pathway placement via knockdown with multiple molecular readouts, single lab","pmids":["23711689"],"is_preprint":false},{"year":2013,"finding":"SPAG9 knockdown in triple-negative breast cancer cells (MDA-MB-231) reduces proliferation, colony formation, migration, invasion, and tumor growth in nude mice xenografts; SPAG9 is predominantly localized in the cytoplasm with surface expression also detected.","method":"siRNA knockdown, IIF, FACS, MTT, invasion assay, xenograft model","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — KD with defined cellular and in vivo phenotype plus subcellular localization, single lab","pmids":["24330581"],"is_preprint":false},{"year":2013,"finding":"SPAG9 knockdown in astrocytoma cell lines reduces cell proliferation and invasion accompanied by downregulation of MMP9, without changes in TIMP1 or TIMP2, suggesting SPAG9 regulates invasion through MMP9.","method":"siRNA knockdown, MTT assay, Matrigel invasion assay, Western blot, RT-PCR","journal":"Tumour biology","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, mechanistic link to MMP9 based on expression changes after KD","pmids":["23696027"],"is_preprint":false},{"year":2014,"finding":"SPAG9 knockdown in prostate cancer cells inhibits motility and invasion through inactivation of MMP-2/MMP-9 accompanied by upregulation of TIMP-1/TIMP-2; SPAG9 silencing also reduces VEGF secretion and tube formation, linking SPAG9 to angiogenesis.","method":"siRNA knockdown, Matrigel invasion assay, Western blot, ELISA, tube formation assay","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 3 — single lab, multiple pathway readouts from KD experiments","pmids":["25310386"],"is_preprint":false},{"year":2014,"finding":"SPAG9 overexpression promotes prostate cancer cell proliferation and regulates cyclin D1 and cyclin E protein levels; siRNA knockdown of SPAG9 inhibits proliferation.","method":"Plasmid transfection, siRNA knockdown, colony formation, MTT assay, Western blot","journal":"Tumour biology","confidence":"Medium","confidence_rationale":"Tier 3 — gain- and loss-of-function with molecular readouts, single lab","pmids":["24740566"],"is_preprint":false},{"year":2015,"finding":"A novel SPAG9-JAK2 fusion gene was identified in B-cell precursor ALL with t(9;17)(p24;q21) by paired-end transcriptome sequencing; cells expressing SPAG9::JAK2 showed constitutive phosphorylation of JAK2 kinase domain tyrosines and STAT3/STAT5.","method":"Paired-end transcriptome sequencing, Ba/F3 retroviral transduction, Western blot for phospho-JAK2/STAT3/STAT5","journal":"Genes, chromosomes & cancer","confidence":"High","confidence_rationale":"Tier 1–2 — functional reconstitution in Ba/F3 cells with mutagenesis of kinase domain, replicated in subsequent functional study","pmids":["25951811","35879405"],"is_preprint":false},{"year":2016,"finding":"SPAG9 ablation (shRNA) in triple-negative breast cancer cells induces mitochondrial membrane potential changes, DNA fragmentation, caspase activation, G0-G1 arrest, and cellular senescence; upregulates BAK, BAX, BIM, BID, NOXA, AIF, Cyto-C, PARP1, APAF1, caspase 3/9, and E-cadherin; downregulates cyclin B1, D1, E, CDK1/4/6, BCL2, BCL-xL, XIAP, cIAP2, MCL1, and EMT markers (SLUG, SNAIL, TWIST, vimentin, N-cadherin, MMP2/3/9, β-catenin). In vivo xenograft studies confirmed tumor suppression.","method":"shRNA knockdown, flow cytometry, Western blot, in vivo xenograft","journal":"Tumour biology","confidence":"Medium","confidence_rationale":"Tier 2 — comprehensive molecular profiling of KD phenotype in vitro and in vivo, single lab","pmids":["27449044"],"is_preprint":false},{"year":2016,"finding":"SPAG9 knockdown in hepatocellular carcinoma cells suppresses cell migration and invasion and inhibits ELK1 expression and p38 signaling; ELK1 overexpression reverses the inhibitory effects of SPAG9 siRNA on HCC cell metastasis, placing SPAG9 upstream of ELK1 in the p38 pathway.","method":"siRNA knockdown, plasmid overexpression, wound healing, Matrigel invasion, Western blot, immunohistochemistry","journal":"OncoTargets and therapy","confidence":"Medium","confidence_rationale":"Tier 3 — epistasis-like rescue experiment placing SPAG9 upstream of ELK1/p38, single lab","pmids":["27042099"],"is_preprint":false},{"year":2018,"finding":"SPAG9 overexpression in bladder cancer cells promotes migration through upregulation of HEF1 and activation of Rac1; SPAG9 silencing reduces HEF1 and Rac1 activity and inhibits migration. SPAG9 also regulates EMT markers E-cadherin and vimentin.","method":"Overexpression/siRNA knockdown, Western blot for Rac1 activation, migration assay, qRT-PCR","journal":"American journal of cancer research","confidence":"Medium","confidence_rationale":"Tier 3 — gain- and loss-of-function with pathway molecule readouts, single lab","pmids":["30662804"],"is_preprint":false},{"year":2019,"finding":"SPAG9 co-immunoprecipitates with JNK in liver cancer (HepG2) cells; SPAG9 knockdown decreases expression of JNK, p38, and MKK3, identifying the SPAG9/MKK3/p38 axis as a regulator of liver cancer cell proliferation, apoptosis, and cell cycle.","method":"Co-immunoprecipitation, siRNA knockdown, Western blot, CCK-8 proliferation assay, flow cytometry","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 — direct protein interaction demonstrated by Co-IP combined with KD showing pathway effects, single lab","pmids":["30720101"],"is_preprint":false},{"year":2019,"finding":"SPAG9 promotes prostate cancer cell proliferation, migration, motility, and cell cycle progression via the MAPK signaling pathway; SPAG9 knockout in nude mice suppresses tumor growth in vivo.","method":"Overexpression/knockdown/knockout, Western blot for MAPK pathway markers, migration assay, xenograft model","journal":"American journal of translational research","confidence":"Medium","confidence_rationale":"Tier 2–3 — loss- and gain-of-function with MAPK pathway readouts and in vivo confirmation, single lab","pmids":["31497238"],"is_preprint":false},{"year":2016,"finding":"SPAG9 is overexpressed in osteosarcoma and positively regulates cyclin D1, phosphorylated JNK, and JunD expression; treatment with the JNK inhibitor SP600125 abolishes SPAG9-induced upregulation of JunD, demonstrating SPAG9 functions through JNK-JunD signaling to promote proliferation and invasion.","method":"siRNA knockdown, plasmid transfection, MTT assay, Matrigel invasion assay, Western blot, JNK inhibitor experiment","journal":"Oncology letters","confidence":"Medium","confidence_rationale":"Tier 2–3 — pharmacological inhibitor experiment confirming JNK as the downstream effector of SPAG9, single lab","pmids":["27698841"],"is_preprint":false},{"year":2022,"finding":"Ba/F3 cells expressing SPAG9::JAK2 fusion proliferate independently of IL-3 and show constitutive phosphorylation of JAK2 kinase domain tyrosines, STAT3, STAT5, and STAT1; mutation of kinase domain tyrosines abolishes IL-3 independence and STAT1 phosphorylation. STAT1 induces BCL-2 and MCL-1 expression, and combination of ruxolitinib with BCL-2/MCL-1 inhibitors synergistically suppresses SPAG9::JAK2-driven proliferation.","method":"Retroviral transduction of Ba/F3 cells, kinase domain mutagenesis, Western blot for phosphoproteins, gene expression analysis, pharmacological inhibitor combination assays, in vivo mouse model","journal":"Cancer gene therapy","confidence":"High","confidence_rationale":"Tier 1 — reconstitution in Ba/F3 cells with site-directed mutagenesis defining catalytic mechanism, combined with gene expression and pharmacological validation","pmids":["35879405"],"is_preprint":false},{"year":2023,"finding":"HLA-G functions in an HLA-G/SPAG9/STAT3 axis to promote establishment of brain metastatic lesions; premetastatic brain metastasis initiating cells exhibit elevated HLA-G and SPAG9 expression, and disruption of this axis impairs brain metastasis.","method":"RNA sequencing of premetastatic vs. macrometastatic BMICs, functional validation of HLA-G/SPAG9/STAT3 axis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2–3 — transcriptomic discovery with functional validation of a signaling axis, single study","pmids":["36780531"],"is_preprint":false},{"year":2021,"finding":"ZSCAN16-AS1 acts as a competing endogenous RNA (ceRNA) to sponge miR-181c-5p, thereby de-repressing SPAG9 expression; SPAG9 in turn activates the JNK pathway to drive HCC cell proliferation, migration, and invasion. RIP and RNA pull-down assays confirmed ZSCAN16-AS1/miR-181c-5p and luciferase assay confirmed miR-181c-5p/SPAG9 interactions.","method":"RNA immunoprecipitation, RNA pull-down, luciferase reporter assay, siRNA knockdown, Western blot, colony formation, transwell assay","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2 — multiple orthogonal methods (RIP, RNA pull-down, luciferase) confirming ceRNA mechanism, single lab","pmids":["34097562"],"is_preprint":false},{"year":2019,"finding":"NEAT1 lncRNA sponges miR-9-5p, which directly targets SPAG9; NEAT1 silencing reduces DDP resistance of anaplastic thyroid carcinoma cells via the miR-9-5p/SPAG9 axis in vitro and in vivo, confirmed by dual-luciferase reporter and RIP assays.","method":"Dual-luciferase reporter assay, RNA immunoprecipitation, siRNA knockdown, qRT-PCR, Western blot, animal model","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 — direct molecular interactions confirmed by multiple methods, functional validation in vitro and in vivo, single lab","pmids":["31485599"],"is_preprint":false},{"year":2019,"finding":"LncRNA H19 competitively binds miR-141, preventing miR-141-mediated degradation of SPAG9, thereby elevating phosphorylated p38 and JNK and facilitating osteogenic/odontogenic differentiation of stem cells from apical papilla.","method":"Lentiviral overexpression/knockdown, Western blot, ALP activity, alizarin red staining, in vivo bone formation assay, molecular sponge mechanism assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 — functional rescue experiments with multiple differentiation readouts and in vivo confirmation, single lab","pmids":["30755596"],"is_preprint":false},{"year":2025,"finding":"Biallelic frameshift variant (c.903del; p.Phe301Leufs*2) in SPAG9 causes a multisystem syndrome (coarse facial features, albinism, cataracts, skeletal abnormalities, developmental delay) in two human families; RT-qPCR confirmed marked reduction of SPAG9 mRNA in affected individuals, establishing a loss-of-function role for SPAG9 in systemic human development.","method":"Whole genome sequencing, Sanger sequencing segregation, RT-qPCR, 3D protein modeling","journal":"Genetics and molecular biology","confidence":"Medium","confidence_rationale":"Tier 2 — human genetics with biallelic variant, molecular confirmation of loss-of-function by mRNA quantification in affected individuals, two independent families","pmids":["39846792"],"is_preprint":false},{"year":2009,"finding":"SPAG9 protein is expressed in human ejaculated spermatozoa and localizes to the equatorial plate and flagella (distinct from the acrosomal localization in intact spermatozoa), suggesting roles in sperm capacitation and motility.","method":"RT-PCR, indirect immunofluorescence of purified spermatozoa","journal":"Zhonghua nan ke xue","confidence":"Low","confidence_rationale":"Tier 3 — localization without direct functional consequence demonstrated, single lab","pmids":["19947555"],"is_preprint":false}],"current_model":"SPAG9 is a scaffold/JIP-like protein that binds JNK (preferentially JNK2/3) via its JNK-binding domain and acts upstream of the MAPK (JNK and p38) cascade; in cancer cells it promotes proliferation, survival, invasion, and EMT by sustaining JNK/MKK3/p38 signaling and downstream effectors including MMP9, JunD, ELK1, cyclin D1/E, and anti-apoptotic BCL-2 family members, while in the testis it localizes to the sperm acrosome/equatorial segment where it participates in sperm-egg interaction; a SPAG9::JAK2 chromosomal fusion constitutively activates JAK2-STAT1/3/5-BCL-2/MCL-1 signaling to drive leukemic proliferation, and biallelic loss-of-function variants cause a multisystem human developmental syndrome."},"narrative":{"teleology":[{"year":2005,"claim":"Establishing SPAG9 as a JNK scaffold: the protein was shown to contain a JNK-binding domain with selectivity for JNK2/3 over JNK1 and no interaction with p38α or ERK, resolving its position in the MAPK hierarchy and defining the domain requirements (leucine zipper/coiled-coil and transmembrane) for dimerization and localization.","evidence":"Co-immunoprecipitation, deletion-mutant transfection, CD spectroscopy, and tandem MS in mammalian cells","pmids":["15693750"],"confidence":"High","gaps":["Crystal or cryo-EM structure of the SPAG9–JNK complex is lacking","Whether SPAG9 directly scaffolds upstream MKKs alongside JNK was not tested","In vivo relevance of JNK isoform selectivity not established"]},{"year":2005,"claim":"Linking SPAG9 to sperm function: the protein localizes to the acrosome in intact spermatozoa, redistributes to the equatorial segment after the acrosome reaction, and anti-SPAG9 antibodies block sperm–egg binding, establishing a direct role in fertilization.","evidence":"Indirect immunofluorescence, Western blot of sperm extracts, hemizona binding assay across primate species","pmids":["15693750","16143403","15293220"],"confidence":"High","gaps":["The oocyte-side receptor for SPAG9 is unknown","Whether SPAG9's JNK scaffold function is relevant in spermatozoa is unresolved","Genetic knockout in a model organism was not performed"]},{"year":2009,"claim":"Demonstrating pro-tumorigenic function: SPAG9 knockdown in cervical cancer cells suppressed growth, colony formation, migration, invasion, and xenograft tumor growth, providing the first direct evidence that SPAG9 is required for cancer cell proliferation and metastatic behavior.","evidence":"Plasmid-based siRNA knockdown with in vitro assays and nude mouse xenograft model","pmids":["19813278"],"confidence":"Medium","gaps":["The specific downstream signaling pathway was not dissected in this system","Rescue by SPAG9 re-expression was not shown","Off-target siRNA effects not controlled by multiple independent sequences"]},{"year":2013,"claim":"Placing SPAG9 upstream of JNK activation and MMP9: knockdown in lung cancer and astrocytoma cells reduced phospho-JNK and MMP9 expression without altering TIMP1/2, linking SPAG9's scaffold activity to a specific protease effector that drives invasion.","evidence":"siRNA knockdown with Western blot, RT-PCR, and invasion assays across multiple cancer cell lines","pmids":["23711689","23696027"],"confidence":"Medium","gaps":["Whether SPAG9 directly scaffolds the kinase cascade leading to MMP9 transcription or acts indirectly was not resolved","MMP9 enzymatic activity (e.g., zymography) was not always measured"]},{"year":2014,"claim":"Expanding downstream effectors to cell-cycle regulators and angiogenic factors: SPAG9 overexpression upregulated cyclin D1/E in prostate cancer cells, and knockdown reduced MMP-2/9, increased TIMPs, and decreased VEGF secretion/tube formation, broadening the functional output of SPAG9 beyond invasion to proliferation and angiogenesis.","evidence":"Gain- and loss-of-function in prostate cancer cells with Western blot, ELISA, and tube formation assay","pmids":["24740566","25310386"],"confidence":"Medium","gaps":["Direct regulation of cyclin D1 promoter by SPAG9-dependent transcription factors not shown","VEGF regulation pathway (JNK-dependent vs. JNK-independent) not delineated"]},{"year":2015,"claim":"Identifying an oncogenic SPAG9::JAK2 fusion: a t(9;17)(p24;q21) translocation in B-ALL produced a SPAG9::JAK2 fusion protein with constitutive JAK2 kinase and STAT3/5 phosphorylation, revealing how SPAG9's coiled-coil domain can drive oligomerization-dependent kinase activation.","evidence":"Paired-end transcriptome sequencing of primary ALL, Ba/F3 retroviral transduction with phospho-JAK2/STAT Western blot","pmids":["25951811"],"confidence":"High","gaps":["Frequency of SPAG9::JAK2 fusions across leukemia subtypes unknown","Whether wild-type SPAG9 influences JAK-STAT signaling was not tested"]},{"year":2016,"claim":"Defining SPAG9's role in apoptosis suppression and EMT: comprehensive molecular profiling after knockdown in triple-negative breast cancer showed upregulation of pro-apoptotic BCL-2 family members and E-cadherin, and downregulation of anti-apoptotic proteins (BCL-2, MCL-1, XIAP), EMT transcription factors (SLUG, SNAIL, TWIST), and mesenchymal markers, establishing SPAG9 as a dual pro-survival and pro-EMT factor.","evidence":"shRNA knockdown with flow cytometry, Western blot panel, and in vivo xenograft","pmids":["27449044"],"confidence":"Medium","gaps":["Which of these changes are direct versus indirect consequences of SPAG9 loss is unknown","Whether the EMT program requires JNK versus p38 was not distinguished"]},{"year":2016,"claim":"Delineating the SPAG9–p38–ELK1 axis: in hepatocellular carcinoma, SPAG9 knockdown inhibited p38 signaling and ELK1 expression, and ELK1 overexpression rescued SPAG9-depleted cells, positioning ELK1 as a key effector downstream of SPAG9/p38 in metastasis.","evidence":"siRNA knockdown combined with ELK1 rescue, wound healing, invasion, and Western blot in HCC cells","pmids":["27042099"],"confidence":"Medium","gaps":["Direct binding of SPAG9 to p38 pathway components was not shown (Co-IP showed JNK binding, initial study found no p38α interaction)","Contribution of JNK vs. p38 to ELK1 regulation not separated"]},{"year":2016,"claim":"Confirming JNK-JunD as a SPAG9-dependent signaling module: a JNK inhibitor abolished SPAG9-induced JunD upregulation in osteosarcoma cells, providing pharmacological evidence that SPAG9 signals through JNK to activate JunD-dependent proliferation and invasion.","evidence":"JNK inhibitor SP600125 in combination with SPAG9 overexpression/knockdown, Western blot for p-JNK, JunD, cyclin D1","pmids":["27698841"],"confidence":"Medium","gaps":["Whether JunD is a direct transcriptional target of JNK-phosphorylated substrates or acts indirectly was not resolved","Other AP-1 family members were not tested"]},{"year":2019,"claim":"Establishing ceRNA regulation of SPAG9: multiple lncRNAs (NEAT1, H19, later ZSCAN16-AS1) were shown to sponge specific miRNAs (miR-9-5p, miR-141, miR-181c-5p) that directly target the SPAG9 3′UTR, identifying post-transcriptional control of SPAG9 abundance as a mechanism governing JNK/p38 pathway output in cancer, drug resistance, and stem cell differentiation.","evidence":"Dual-luciferase reporter, RNA immunoprecipitation, RNA pull-down, and functional rescue across thyroid carcinoma, HCC, and dental stem cells","pmids":["31485599","30755596","34097562"],"confidence":"Medium","gaps":["Endogenous stoichiometry of miRNA sponging has not been quantified","Whether these ceRNA circuits operate outside the specific cell types tested is unknown"]},{"year":2022,"claim":"Mechanistic dissection of SPAG9::JAK2 oncogenic signaling: kinase-domain tyrosine mutagenesis abolished IL-3-independent growth and STAT1 phosphorylation; STAT1 was shown to induce BCL-2 and MCL-1, and combination of ruxolitinib with BCL-2/MCL-1 inhibitors synergistically killed fusion-expressing cells, defining a targetable JAK2–STAT1–BCL-2/MCL-1 circuit.","evidence":"Ba/F3 retroviral reconstitution with site-directed mutagenesis, gene expression profiling, pharmacological combination assays, in vivo mouse model","pmids":["35879405"],"confidence":"High","gaps":["Clinical validation of the ruxolitinib/BCL-2 inhibitor combination in patients with SPAG9::JAK2-positive ALL is lacking","Whether STAT1-driven BCL-2/MCL-1 is unique to this fusion or shared with other JAK2 fusions is unknown"]},{"year":2025,"claim":"Linking SPAG9 loss-of-function to human developmental disease: biallelic frameshift variants in two families caused a multisystem syndrome (coarse facies, albinism, cataracts, skeletal abnormalities, developmental delay), with confirmed SPAG9 mRNA depletion, establishing SPAG9 as essential for human development beyond its known roles in germ cells and cancer.","evidence":"Whole-genome sequencing, Sanger segregation in two independent families, RT-qPCR of patient samples","pmids":["39846792"],"confidence":"Medium","gaps":["Animal model recapitulating the syndrome has not been reported","Which SPAG9-dependent signaling pathways underlie the developmental phenotypes is unknown","Only one truncating variant has been described; allelic series is lacking"]},{"year":null,"claim":"The structural basis for SPAG9's scaffold interactions with JNK and putative p38-pathway components remains unresolved, and how the same scaffold supports such diverse tissue-specific outputs (sperm-egg binding, neuronal JNK3 signaling, EMT, osteogenic differentiation, systemic development) is not mechanistically explained.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of full-length SPAG9 or its complexes exists","Genetic knockout/conditional models in mice have not been reported","Direct p38 pathway binding partners of SPAG9 have not been biochemically identified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,3,12,14]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,10,14]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,4]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,3,10,12,14,15]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[8,15]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[1]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[9]}],"complexes":[],"partners":["JNK2","JNK3","MKK3","JAK2","ELK1","HLA-G","STAT3"],"other_free_text":[]},"mechanistic_narrative":"SPAG9 is a JIP-like scaffold protein that organizes MAPK signaling — principally the JNK and p38 cascades — to control cell proliferation, survival, migration, and differentiation in diverse tissues. It binds JNK2 and JNK3 preferentially through a dedicated JNK-binding domain and requires leucine-zipper/coiled-coil and transmembrane domains for dimerization and proper subcellular localization; in cancer cells, SPAG9 sustains JNK-JunD, MKK3-p38-ELK1, and downstream MMP9/cyclin D1 signaling to drive proliferation, invasion, and epithelial-mesenchymal transition, while its loss triggers mitochondrial apoptosis and senescence [PMID:15693750, PMID:27698841, PMID:27042099, PMID:27449044]. In the testis, SPAG9 localizes to the sperm acrosome and relocates to the equatorial segment after the acrosome reaction, where it participates in sperm–egg binding [PMID:15693750, PMID:16143403]. Biallelic loss-of-function variants in SPAG9 cause a multisystem human developmental syndrome featuring coarse facies, albinism, cataracts, skeletal abnormalities, and developmental delay [PMID:39846792]."},"prefetch_data":{"uniprot":{"accession":"O60271","full_name":"C-Jun-amino-terminal kinase-interacting protein 4","aliases":["Cancer/testis antigen 89","CT89","Human lung cancer oncogene 6 protein","HLC-6","JNK-associated leucine-zipper protein","JLP","Mitogen-activated protein kinase 8-interacting protein 4","Proliferation-inducing protein 6","Protein highly expressed in testis","PHET","Sperm surface protein","Sperm-associated antigen 9","Sperm-specific protein","Sunday driver 1"],"length_aa":1321,"mass_kda":146.2,"function":"The JNK-interacting protein (JIP) group of scaffold proteins selectively mediates JNK signaling by aggregating specific components of the MAPK cascade to form a functional JNK signaling module (PubMed:14743216). Regulates lysosomal positioning by acting as an adapter protein which links PIP4P1-positive lysosomes to the dynein-dynactin complex (PubMed:29146937). 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biophysics","url":"https://pubmed.ncbi.nlm.nih.gov/3621139","citation_count":0,"is_preprint":false},{"pmid":"15617240","id":"PMC_15617240","title":"[Anti-virus effect of hepatocyte stimulating substance (HSS) on duck hepatitis B virus in vivo].","date":"1997","source":"Zhonghua shi yan he lin chuang bing du xue za zhi = Zhonghua shiyan he linchuang bingduxue zazhi = Chinese journal of experimental and clinical virology","url":"https://pubmed.ncbi.nlm.nih.gov/15617240","citation_count":0,"is_preprint":false},{"pmid":"35383860","id":"PMC_35383860","title":"[Corrigendum] SPAG9 expression is increased in human prostate cancer and promotes cell motility, invasion and angiogenesis in vitro.","date":"2022","source":"Oncology reports","url":"https://pubmed.ncbi.nlm.nih.gov/35383860","citation_count":0,"is_preprint":false},{"pmid":"34919215","id":"PMC_34919215","title":"MiR-524 inhibits cell proliferation and induces cell apoptosis in thyroid cancer via targeting SPAG9.","date":"2021","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/34919215","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.09.12.25335638","title":"Trends in cigarette and e-cigarette use among youth: Findings from the 2014-2023 China Youth Tobacco Survey in Heilongjiang Province","date":"2025-09-14","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.12.25335638","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.09.10.675441","title":"Abnormal shear stress induces ferroptosis in endothelial cells via KLF6 downregulation","date":"2025-09-16","source":"bioRxiv","url":"https://doi.org/10.1101/2025.09.10.675441","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.04.29.25326667","title":"System-Wide Investments Enhance HIV, TB and Malaria Control in Malawi and Deliver Greater Health Impact","date":"2025-04-30","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.29.25326667","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.04.23.650148","title":"In Vitro and Viral Evolution Convergence Reveal the Selective Pressures Driving Omicron Emergence","date":"2025-04-24","source":"bioRxiv","url":"https://doi.org/10.1101/2025.04.23.650148","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2025.02.02.25321553","title":"Evaluation Of Modified Hematological Sepsis Scoring System In Early Diagnosis Of Neonatal 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Both the leucine zipper/coiled-coil domains and the transmembrane domain are required for dimerization and proper subcellular localization.\",\n      \"method\": \"Co-immunoprecipitation, deletion mutant transfection, CD spectroscopy, tandem MS, indirect immunofluorescence\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — multiple orthogonal methods (Co-IP, domain deletion mutants, structural analysis) in a single rigorous study establishing JNK binding specificity and domain requirements\",\n      \"pmids\": [\"15693750\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"SPAG9 protein localizes to the acrosomal compartment of intact human spermatozoa and relocates to the equatorial segment after the acrosome reaction; anti-SPAG9 antibodies inhibit sperm binding to intact human oocytes and hemizonae.\",\n      \"method\": \"Indirect immunofluorescence, Western blot of sperm extracts, hemizona binding assay\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional consequence (inhibition of sperm-egg binding), replicated in multiple primate species\",\n      \"pmids\": [\"15693750\", \"16143403\", \"15293220\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"siRNA-mediated knockdown of SPAG9 in SiHa cervical squamous cell carcinoma cells inhibits cell growth, colony formation, migration, and invasion in vitro, and significantly suppresses tumor growth in a cervical cancer xenograft model in nude mice.\",\n      \"method\": \"Plasmid-based siRNA knockdown, colony formation assay, migration/invasion assays, xenograft tumor model\",\n      \"journal\": \"Cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular and in vivo phenotypic readout, single lab\",\n      \"pmids\": [\"19813278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SPAG9 knockdown in non-small cell lung cancer cells inhibits cell growth and invasion and is accompanied by downregulation of MMP9 mRNA/protein and inhibition of JNK phosphorylation, placing SPAG9 upstream of JNK activation and MMP9 expression.\",\n      \"method\": \"siRNA knockdown, Western blot, RT-PCR, cell growth and invasion assays\",\n      \"journal\": \"Lung cancer (Amsterdam, Netherlands)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — pathway placement via knockdown with multiple molecular readouts, single lab\",\n      \"pmids\": [\"23711689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SPAG9 knockdown in triple-negative breast cancer cells (MDA-MB-231) reduces proliferation, colony formation, migration, invasion, and tumor growth in nude mice xenografts; SPAG9 is predominantly localized in the cytoplasm with surface expression also detected.\",\n      \"method\": \"siRNA knockdown, IIF, FACS, MTT, invasion assay, xenograft model\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — KD with defined cellular and in vivo phenotype plus subcellular localization, single lab\",\n      \"pmids\": [\"24330581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"SPAG9 knockdown in astrocytoma cell lines reduces cell proliferation and invasion accompanied by downregulation of MMP9, without changes in TIMP1 or TIMP2, suggesting SPAG9 regulates invasion through MMP9.\",\n      \"method\": \"siRNA knockdown, MTT assay, Matrigel invasion assay, Western blot, RT-PCR\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, mechanistic link to MMP9 based on expression changes after KD\",\n      \"pmids\": [\"23696027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SPAG9 knockdown in prostate cancer cells inhibits motility and invasion through inactivation of MMP-2/MMP-9 accompanied by upregulation of TIMP-1/TIMP-2; SPAG9 silencing also reduces VEGF secretion and tube formation, linking SPAG9 to angiogenesis.\",\n      \"method\": \"siRNA knockdown, Matrigel invasion assay, Western blot, ELISA, tube formation assay\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — single lab, multiple pathway readouts from KD experiments\",\n      \"pmids\": [\"25310386\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SPAG9 overexpression promotes prostate cancer cell proliferation and regulates cyclin D1 and cyclin E protein levels; siRNA knockdown of SPAG9 inhibits proliferation.\",\n      \"method\": \"Plasmid transfection, siRNA knockdown, colony formation, MTT assay, Western blot\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — gain- and loss-of-function with molecular readouts, single lab\",\n      \"pmids\": [\"24740566\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A novel SPAG9-JAK2 fusion gene was identified in B-cell precursor ALL with t(9;17)(p24;q21) by paired-end transcriptome sequencing; cells expressing SPAG9::JAK2 showed constitutive phosphorylation of JAK2 kinase domain tyrosines and STAT3/STAT5.\",\n      \"method\": \"Paired-end transcriptome sequencing, Ba/F3 retroviral transduction, Western blot for phospho-JAK2/STAT3/STAT5\",\n      \"journal\": \"Genes, chromosomes & cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — functional reconstitution in Ba/F3 cells with mutagenesis of kinase domain, replicated in subsequent functional study\",\n      \"pmids\": [\"25951811\", \"35879405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SPAG9 ablation (shRNA) in triple-negative breast cancer cells induces mitochondrial membrane potential changes, DNA fragmentation, caspase activation, G0-G1 arrest, and cellular senescence; upregulates BAK, BAX, BIM, BID, NOXA, AIF, Cyto-C, PARP1, APAF1, caspase 3/9, and E-cadherin; downregulates cyclin B1, D1, E, CDK1/4/6, BCL2, BCL-xL, XIAP, cIAP2, MCL1, and EMT markers (SLUG, SNAIL, TWIST, vimentin, N-cadherin, MMP2/3/9, β-catenin). In vivo xenograft studies confirmed tumor suppression.\",\n      \"method\": \"shRNA knockdown, flow cytometry, Western blot, in vivo xenograft\",\n      \"journal\": \"Tumour biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — comprehensive molecular profiling of KD phenotype in vitro and in vivo, single lab\",\n      \"pmids\": [\"27449044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SPAG9 knockdown in hepatocellular carcinoma cells suppresses cell migration and invasion and inhibits ELK1 expression and p38 signaling; ELK1 overexpression reverses the inhibitory effects of SPAG9 siRNA on HCC cell metastasis, placing SPAG9 upstream of ELK1 in the p38 pathway.\",\n      \"method\": \"siRNA knockdown, plasmid overexpression, wound healing, Matrigel invasion, Western blot, immunohistochemistry\",\n      \"journal\": \"OncoTargets and therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — epistasis-like rescue experiment placing SPAG9 upstream of ELK1/p38, single lab\",\n      \"pmids\": [\"27042099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SPAG9 overexpression in bladder cancer cells promotes migration through upregulation of HEF1 and activation of Rac1; SPAG9 silencing reduces HEF1 and Rac1 activity and inhibits migration. SPAG9 also regulates EMT markers E-cadherin and vimentin.\",\n      \"method\": \"Overexpression/siRNA knockdown, Western blot for Rac1 activation, migration assay, qRT-PCR\",\n      \"journal\": \"American journal of cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — gain- and loss-of-function with pathway molecule readouts, single lab\",\n      \"pmids\": [\"30662804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SPAG9 co-immunoprecipitates with JNK in liver cancer (HepG2) cells; SPAG9 knockdown decreases expression of JNK, p38, and MKK3, identifying the SPAG9/MKK3/p38 axis as a regulator of liver cancer cell proliferation, apoptosis, and cell cycle.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown, Western blot, CCK-8 proliferation assay, flow cytometry\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct protein interaction demonstrated by Co-IP combined with KD showing pathway effects, single lab\",\n      \"pmids\": [\"30720101\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SPAG9 promotes prostate cancer cell proliferation, migration, motility, and cell cycle progression via the MAPK signaling pathway; SPAG9 knockout in nude mice suppresses tumor growth in vivo.\",\n      \"method\": \"Overexpression/knockdown/knockout, Western blot for MAPK pathway markers, migration assay, xenograft model\",\n      \"journal\": \"American journal of translational research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — loss- and gain-of-function with MAPK pathway readouts and in vivo confirmation, single lab\",\n      \"pmids\": [\"31497238\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SPAG9 is overexpressed in osteosarcoma and positively regulates cyclin D1, phosphorylated JNK, and JunD expression; treatment with the JNK inhibitor SP600125 abolishes SPAG9-induced upregulation of JunD, demonstrating SPAG9 functions through JNK-JunD signaling to promote proliferation and invasion.\",\n      \"method\": \"siRNA knockdown, plasmid transfection, MTT assay, Matrigel invasion assay, Western blot, JNK inhibitor experiment\",\n      \"journal\": \"Oncology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — pharmacological inhibitor experiment confirming JNK as the downstream effector of SPAG9, single lab\",\n      \"pmids\": [\"27698841\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Ba/F3 cells expressing SPAG9::JAK2 fusion proliferate independently of IL-3 and show constitutive phosphorylation of JAK2 kinase domain tyrosines, STAT3, STAT5, and STAT1; mutation of kinase domain tyrosines abolishes IL-3 independence and STAT1 phosphorylation. STAT1 induces BCL-2 and MCL-1 expression, and combination of ruxolitinib with BCL-2/MCL-1 inhibitors synergistically suppresses SPAG9::JAK2-driven proliferation.\",\n      \"method\": \"Retroviral transduction of Ba/F3 cells, kinase domain mutagenesis, Western blot for phosphoproteins, gene expression analysis, pharmacological inhibitor combination assays, in vivo mouse model\",\n      \"journal\": \"Cancer gene therapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution in Ba/F3 cells with site-directed mutagenesis defining catalytic mechanism, combined with gene expression and pharmacological validation\",\n      \"pmids\": [\"35879405\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"HLA-G functions in an HLA-G/SPAG9/STAT3 axis to promote establishment of brain metastatic lesions; premetastatic brain metastasis initiating cells exhibit elevated HLA-G and SPAG9 expression, and disruption of this axis impairs brain metastasis.\",\n      \"method\": \"RNA sequencing of premetastatic vs. macrometastatic BMICs, functional validation of HLA-G/SPAG9/STAT3 axis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — transcriptomic discovery with functional validation of a signaling axis, single study\",\n      \"pmids\": [\"36780531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ZSCAN16-AS1 acts as a competing endogenous RNA (ceRNA) to sponge miR-181c-5p, thereby de-repressing SPAG9 expression; SPAG9 in turn activates the JNK pathway to drive HCC cell proliferation, migration, and invasion. RIP and RNA pull-down assays confirmed ZSCAN16-AS1/miR-181c-5p and luciferase assay confirmed miR-181c-5p/SPAG9 interactions.\",\n      \"method\": \"RNA immunoprecipitation, RNA pull-down, luciferase reporter assay, siRNA knockdown, Western blot, colony formation, transwell assay\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (RIP, RNA pull-down, luciferase) confirming ceRNA mechanism, single lab\",\n      \"pmids\": [\"34097562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"NEAT1 lncRNA sponges miR-9-5p, which directly targets SPAG9; NEAT1 silencing reduces DDP resistance of anaplastic thyroid carcinoma cells via the miR-9-5p/SPAG9 axis in vitro and in vivo, confirmed by dual-luciferase reporter and RIP assays.\",\n      \"method\": \"Dual-luciferase reporter assay, RNA immunoprecipitation, siRNA knockdown, qRT-PCR, Western blot, animal model\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct molecular interactions confirmed by multiple methods, functional validation in vitro and in vivo, single lab\",\n      \"pmids\": [\"31485599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"LncRNA H19 competitively binds miR-141, preventing miR-141-mediated degradation of SPAG9, thereby elevating phosphorylated p38 and JNK and facilitating osteogenic/odontogenic differentiation of stem cells from apical papilla.\",\n      \"method\": \"Lentiviral overexpression/knockdown, Western blot, ALP activity, alizarin red staining, in vivo bone formation assay, molecular sponge mechanism assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional rescue experiments with multiple differentiation readouts and in vivo confirmation, single lab\",\n      \"pmids\": [\"30755596\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Biallelic frameshift variant (c.903del; p.Phe301Leufs*2) in SPAG9 causes a multisystem syndrome (coarse facial features, albinism, cataracts, skeletal abnormalities, developmental delay) in two human families; RT-qPCR confirmed marked reduction of SPAG9 mRNA in affected individuals, establishing a loss-of-function role for SPAG9 in systemic human development.\",\n      \"method\": \"Whole genome sequencing, Sanger sequencing segregation, RT-qPCR, 3D protein modeling\",\n      \"journal\": \"Genetics and molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — human genetics with biallelic variant, molecular confirmation of loss-of-function by mRNA quantification in affected individuals, two independent families\",\n      \"pmids\": [\"39846792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SPAG9 protein is expressed in human ejaculated spermatozoa and localizes to the equatorial plate and flagella (distinct from the acrosomal localization in intact spermatozoa), suggesting roles in sperm capacitation and motility.\",\n      \"method\": \"RT-PCR, indirect immunofluorescence of purified spermatozoa\",\n      \"journal\": \"Zhonghua nan ke xue\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — localization without direct functional consequence demonstrated, single lab\",\n      \"pmids\": [\"19947555\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SPAG9 is a scaffold/JIP-like protein that binds JNK (preferentially JNK2/3) via its JNK-binding domain and acts upstream of the MAPK (JNK and p38) cascade; in cancer cells it promotes proliferation, survival, invasion, and EMT by sustaining JNK/MKK3/p38 signaling and downstream effectors including MMP9, JunD, ELK1, cyclin D1/E, and anti-apoptotic BCL-2 family members, while in the testis it localizes to the sperm acrosome/equatorial segment where it participates in sperm-egg interaction; a SPAG9::JAK2 chromosomal fusion constitutively activates JAK2-STAT1/3/5-BCL-2/MCL-1 signaling to drive leukemic proliferation, and biallelic loss-of-function variants cause a multisystem human developmental syndrome.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SPAG9 is a JIP-like scaffold protein that organizes MAPK signaling — principally the JNK and p38 cascades — to control cell proliferation, survival, migration, and differentiation in diverse tissues. It binds JNK2 and JNK3 preferentially through a dedicated JNK-binding domain and requires leucine-zipper/coiled-coil and transmembrane domains for dimerization and proper subcellular localization; in cancer cells, SPAG9 sustains JNK-JunD, MKK3-p38-ELK1, and downstream MMP9/cyclin D1 signaling to drive proliferation, invasion, and epithelial-mesenchymal transition, while its loss triggers mitochondrial apoptosis and senescence [PMID:15693750, PMID:27698841, PMID:27042099, PMID:27449044]. In the testis, SPAG9 localizes to the sperm acrosome and relocates to the equatorial segment after the acrosome reaction, where it participates in sperm–egg binding [PMID:15693750, PMID:16143403]. Biallelic loss-of-function variants in SPAG9 cause a multisystem human developmental syndrome featuring coarse facies, albinism, cataracts, skeletal abnormalities, and developmental delay [PMID:39846792].\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Establishing SPAG9 as a JNK scaffold: the protein was shown to contain a JNK-binding domain with selectivity for JNK2/3 over JNK1 and no interaction with p38α or ERK, resolving its position in the MAPK hierarchy and defining the domain requirements (leucine zipper/coiled-coil and transmembrane) for dimerization and localization.\",\n      \"evidence\": \"Co-immunoprecipitation, deletion-mutant transfection, CD spectroscopy, and tandem MS in mammalian cells\",\n      \"pmids\": [\"15693750\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Crystal or cryo-EM structure of the SPAG9–JNK complex is lacking\",\n        \"Whether SPAG9 directly scaffolds upstream MKKs alongside JNK was not tested\",\n        \"In vivo relevance of JNK isoform selectivity not established\"\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Linking SPAG9 to sperm function: the protein localizes to the acrosome in intact spermatozoa, redistributes to the equatorial segment after the acrosome reaction, and anti-SPAG9 antibodies block sperm–egg binding, establishing a direct role in fertilization.\",\n      \"evidence\": \"Indirect immunofluorescence, Western blot of sperm extracts, hemizona binding assay across primate species\",\n      \"pmids\": [\"15693750\", \"16143403\", \"15293220\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"The oocyte-side receptor for SPAG9 is unknown\",\n        \"Whether SPAG9's JNK scaffold function is relevant in spermatozoa is unresolved\",\n        \"Genetic knockout in a model organism was not performed\"\n      ]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating pro-tumorigenic function: SPAG9 knockdown in cervical cancer cells suppressed growth, colony formation, migration, invasion, and xenograft tumor growth, providing the first direct evidence that SPAG9 is required for cancer cell proliferation and metastatic behavior.\",\n      \"evidence\": \"Plasmid-based siRNA knockdown with in vitro assays and nude mouse xenograft model\",\n      \"pmids\": [\"19813278\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"The specific downstream signaling pathway was not dissected in this system\",\n        \"Rescue by SPAG9 re-expression was not shown\",\n        \"Off-target siRNA effects not controlled by multiple independent sequences\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placing SPAG9 upstream of JNK activation and MMP9: knockdown in lung cancer and astrocytoma cells reduced phospho-JNK and MMP9 expression without altering TIMP1/2, linking SPAG9's scaffold activity to a specific protease effector that drives invasion.\",\n      \"evidence\": \"siRNA knockdown with Western blot, RT-PCR, and invasion assays across multiple cancer cell lines\",\n      \"pmids\": [\"23711689\", \"23696027\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether SPAG9 directly scaffolds the kinase cascade leading to MMP9 transcription or acts indirectly was not resolved\",\n        \"MMP9 enzymatic activity (e.g., zymography) was not always measured\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Expanding downstream effectors to cell-cycle regulators and angiogenic factors: SPAG9 overexpression upregulated cyclin D1/E in prostate cancer cells, and knockdown reduced MMP-2/9, increased TIMPs, and decreased VEGF secretion/tube formation, broadening the functional output of SPAG9 beyond invasion to proliferation and angiogenesis.\",\n      \"evidence\": \"Gain- and loss-of-function in prostate cancer cells with Western blot, ELISA, and tube formation assay\",\n      \"pmids\": [\"24740566\", \"25310386\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct regulation of cyclin D1 promoter by SPAG9-dependent transcription factors not shown\",\n        \"VEGF regulation pathway (JNK-dependent vs. JNK-independent) not delineated\"\n      ]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identifying an oncogenic SPAG9::JAK2 fusion: a t(9;17)(p24;q21) translocation in B-ALL produced a SPAG9::JAK2 fusion protein with constitutive JAK2 kinase and STAT3/5 phosphorylation, revealing how SPAG9's coiled-coil domain can drive oligomerization-dependent kinase activation.\",\n      \"evidence\": \"Paired-end transcriptome sequencing of primary ALL, Ba/F3 retroviral transduction with phospho-JAK2/STAT Western blot\",\n      \"pmids\": [\"25951811\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Frequency of SPAG9::JAK2 fusions across leukemia subtypes unknown\",\n        \"Whether wild-type SPAG9 influences JAK-STAT signaling was not tested\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Defining SPAG9's role in apoptosis suppression and EMT: comprehensive molecular profiling after knockdown in triple-negative breast cancer showed upregulation of pro-apoptotic BCL-2 family members and E-cadherin, and downregulation of anti-apoptotic proteins (BCL-2, MCL-1, XIAP), EMT transcription factors (SLUG, SNAIL, TWIST), and mesenchymal markers, establishing SPAG9 as a dual pro-survival and pro-EMT factor.\",\n      \"evidence\": \"shRNA knockdown with flow cytometry, Western blot panel, and in vivo xenograft\",\n      \"pmids\": [\"27449044\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Which of these changes are direct versus indirect consequences of SPAG9 loss is unknown\",\n        \"Whether the EMT program requires JNK versus p38 was not distinguished\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Delineating the SPAG9–p38–ELK1 axis: in hepatocellular carcinoma, SPAG9 knockdown inhibited p38 signaling and ELK1 expression, and ELK1 overexpression rescued SPAG9-depleted cells, positioning ELK1 as a key effector downstream of SPAG9/p38 in metastasis.\",\n      \"evidence\": \"siRNA knockdown combined with ELK1 rescue, wound healing, invasion, and Western blot in HCC cells\",\n      \"pmids\": [\"27042099\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct binding of SPAG9 to p38 pathway components was not shown (Co-IP showed JNK binding, initial study found no p38α interaction)\",\n        \"Contribution of JNK vs. p38 to ELK1 regulation not separated\"\n      ]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Confirming JNK-JunD as a SPAG9-dependent signaling module: a JNK inhibitor abolished SPAG9-induced JunD upregulation in osteosarcoma cells, providing pharmacological evidence that SPAG9 signals through JNK to activate JunD-dependent proliferation and invasion.\",\n      \"evidence\": \"JNK inhibitor SP600125 in combination with SPAG9 overexpression/knockdown, Western blot for p-JNK, JunD, cyclin D1\",\n      \"pmids\": [\"27698841\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether JunD is a direct transcriptional target of JNK-phosphorylated substrates or acts indirectly was not resolved\",\n        \"Other AP-1 family members were not tested\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Establishing ceRNA regulation of SPAG9: multiple lncRNAs (NEAT1, H19, later ZSCAN16-AS1) were shown to sponge specific miRNAs (miR-9-5p, miR-141, miR-181c-5p) that directly target the SPAG9 3′UTR, identifying post-transcriptional control of SPAG9 abundance as a mechanism governing JNK/p38 pathway output in cancer, drug resistance, and stem cell differentiation.\",\n      \"evidence\": \"Dual-luciferase reporter, RNA immunoprecipitation, RNA pull-down, and functional rescue across thyroid carcinoma, HCC, and dental stem cells\",\n      \"pmids\": [\"31485599\", \"30755596\", \"34097562\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Endogenous stoichiometry of miRNA sponging has not been quantified\",\n        \"Whether these ceRNA circuits operate outside the specific cell types tested is unknown\"\n      ]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Mechanistic dissection of SPAG9::JAK2 oncogenic signaling: kinase-domain tyrosine mutagenesis abolished IL-3-independent growth and STAT1 phosphorylation; STAT1 was shown to induce BCL-2 and MCL-1, and combination of ruxolitinib with BCL-2/MCL-1 inhibitors synergistically killed fusion-expressing cells, defining a targetable JAK2–STAT1–BCL-2/MCL-1 circuit.\",\n      \"evidence\": \"Ba/F3 retroviral reconstitution with site-directed mutagenesis, gene expression profiling, pharmacological combination assays, in vivo mouse model\",\n      \"pmids\": [\"35879405\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Clinical validation of the ruxolitinib/BCL-2 inhibitor combination in patients with SPAG9::JAK2-positive ALL is lacking\",\n        \"Whether STAT1-driven BCL-2/MCL-1 is unique to this fusion or shared with other JAK2 fusions is unknown\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Linking SPAG9 loss-of-function to human developmental disease: biallelic frameshift variants in two families caused a multisystem syndrome (coarse facies, albinism, cataracts, skeletal abnormalities, developmental delay), with confirmed SPAG9 mRNA depletion, establishing SPAG9 as essential for human development beyond its known roles in germ cells and cancer.\",\n      \"evidence\": \"Whole-genome sequencing, Sanger segregation in two independent families, RT-qPCR of patient samples\",\n      \"pmids\": [\"39846792\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Animal model recapitulating the syndrome has not been reported\",\n        \"Which SPAG9-dependent signaling pathways underlie the developmental phenotypes is unknown\",\n        \"Only one truncating variant has been described; allelic series is lacking\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural basis for SPAG9's scaffold interactions with JNK and putative p38-pathway components remains unresolved, and how the same scaffold supports such diverse tissue-specific outputs (sperm-egg binding, neuronal JNK3 signaling, EMT, osteogenic differentiation, systemic development) is not mechanistically explained.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No high-resolution structure of full-length SPAG9 or its complexes exists\",\n        \"Genetic knockout/conditional models in mice have not been reported\",\n        \"Direct p38 pathway binding partners of SPAG9 have not been biochemically identified\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 3, 12, 14]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 10, 14]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 4]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 3, 10, 12, 14, 15]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [8, 15]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"JNK2\",\n      \"JNK3\",\n      \"MKK3\",\n      \"JAK2\",\n      \"ELK1\",\n      \"HLA-G\",\n      \"STAT3\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}