{"gene":"CST7","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":2002,"finding":"Cystatin F (CST7) is expressed both secreted and intracellularly in U937 promyeloid cells, with approximately 25% retained intracellularly. Immunocytochemistry demonstrated granular cytoplasmic localization that does not colocalize with endoplasmic reticulum markers. The promoter region of CST7 contains a unique C/EBPα binding site (absent in cystatin C promoter), explaining its restricted hematopoietic expression. Treatment with all-trans retinoic acid caused ~18-fold down-regulation of intracellular cystatin F during granulocytic differentiation.","method":"Immunocytochemistry, immunofluorescence double-staining, promoter analysis, protein purification from cell lysates, differentiation assays","journal":"European journal of biochemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (localization, promoter analysis, protein purification) in single study with rigorous controls","pmids":["12423348"],"is_preprint":false},{"year":2000,"finding":"The CST7 gene (encoding cystatin F/CMAP/leukocystatin) is located at human genomic locus 20p11.21-p11.22 (mouse chromosome 2G1-G3), is constructed from four exons encoding functional domains, and its promoter lacks typical TATA/CAAT-box elements and CpG-rich island characteristics of housekeeping genes, consistent with restricted hematopoietic expression.","method":"FISH analysis, genomic cloning, computational promoter analysis","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 — FISH and genomic characterization; single study","pmids":["10945474"],"is_preprint":false},{"year":2018,"finding":"The transcription factor C/EBPα directly binds the CST7 gene promoter in U937 cells (shown by chromatin immunoprecipitation assay) and regulates cystatin F expression during monocyte-to-macrophage differentiation. Following PMA-induced differentiation, C/EBPα binding to the CST7 promoter decreased significantly, concurrent with decreased C/EBPα protein levels and reduced cystatin F expression, allowing increased endolysosomal cathepsin C, L, and S activity. Co-immunoprecipitation, proximity ligation assay, and immunofluorescence confirmed cathepsins C, L, and S as the main interacting partners of cystatin F in U937 and HL-60 cells.","method":"Chromatin immunoprecipitation (ChIP), co-immunoprecipitation, proximity ligation assay, immunofluorescence confocal microscopy, differentiation assays","journal":"European journal of cell biology","confidence":"High","confidence_rationale":"Tier 1-2 — ChIP directly showing transcription factor binding, combined with co-IP and PLA confirming protein-protein interactions, multiple orthogonal methods","pmids":["30033148"],"is_preprint":false},{"year":2017,"finding":"RIPK1 kinase activity in microglia regulates the transcriptional induction of Cst7 (cystatin F) in disease-associated microglia (DAM). Pharmacological and genetic inhibition of RIPK1 in APP/PS1 mice reduced Cst7 expression. RIPK1-mediated induction of Cst7 leads to impairment of the lysosomal pathway in microglia, contributing to reduced Aβ phagocytic/degradation capacity.","method":"Pharmacological inhibition, genetic knockout, transcriptional profiling, in vitro lysosomal degradation assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — both pharmacological and genetic RIPK1 inhibition with transcriptional and functional readouts, replicated across multiple approaches","pmids":["28904096"],"is_preprint":false},{"year":2023,"finding":"Cst7 (cystatin F) plays a sexually dimorphic role in microglia in an amyloid-driven Alzheimer's disease model. In female Cst7-knockout × App mice, microglia had greater endolysosomal gene expression, lysosomal burden, and amyloid beta (Aβ) burden in vivo, and were more phagocytic in vitro. In males, Cst7-knockout microglia were less inflammatory and had reduced lysosomal burden without change in Aβ burden. This establishes Cst7 as a functional regulator of endolysosomal activity and inflammatory state in microglia in a sex-dependent manner.","method":"Cst7 knockout mouse crossed with App amyloidosis model, in vivo amyloid burden measurement, lysosomal burden assay, in vitro phagocytosis assay, transcriptomics","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — genetic loss-of-function with multiple cellular and in vivo phenotypic readouts, sex-stratified analysis","pmids":["38085657"],"is_preprint":false},{"year":2024,"finding":"Cystatin F (encoded by Cst7) attenuates neuroinflammation and demyelination in a murine coronavirus (JHMV) CNS infection model. Cst7-/- mice showed increased T cell infiltration into the spinal cord, increased axonal damage, increased demyelination, and impaired remyelination compared to controls. Single-cell RNA-seq revealed elevated expression of T cell chemoattractants Cxcl9 and Cxcl10 and increased Ifng and Prf1 transcripts in CD8+ T cells from Cst7-/- mice, indicating cystatin F limits neuroinflammation by suppressing chemoattractant and cytotoxic T cell gene expression. Viral replication was not affected by Cst7 loss, indicating the phenotype is immune-modulatory not anti-viral.","method":"Cst7-/- mouse model, intracranial viral infection, flow cytometry, single-cell RNA-seq, viral plaque assay, histology (luxol fast blue, H&E, SMI-32 IHC), electron microscopy with g-ratio","journal":"Journal of neuroinflammation","confidence":"High","confidence_rationale":"Tier 2 — genetic loss-of-function with multiple orthogonal readouts (histology, flow cytometry, scRNA-seq, EM) in a defined disease model","pmids":["38879499"],"is_preprint":false},{"year":2017,"finding":"Cst7 mRNA is the most strongly upregulated transcript in brains of pre-symptomatic prion-infected mice, and its cognate protein (cystatin F) is also robustly elevated early in disease. This was validated across multiple mouse prion disease models. Cst7/cystatin F induction is an early biomarker of prion pathogenesis in mice, preceding clinical signs.","method":"Global transcriptional profiling, RT-qPCR validation, protein quantification, multiple prion mouse models","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 — replicated across multiple prion models, but functional mechanism of Cst7 induction in this context not directly interrogated","pmids":["28178353"],"is_preprint":false},{"year":2012,"finding":"CST7 expression in prostate cancer cells (C4-2B) is a downstream target of Runx2 transcription factor, and its induction by Runx2 requires recruitment of the histone methyltransferase G9a to Runx2 binding sites at the CST7 locus. G9a co-immunoprecipitates with Runx2, and G9a depletion reduces CST7 expression. The histone methyltransferase activity of G9a is not required for this transcriptional activation.","method":"Co-immunoprecipitation, GST-pulldown, chromatin immunoprecipitation (ChIP), siRNA knockdown, reporter assay, FRAP","journal":"Journal of cellular biochemistry","confidence":"High","confidence_rationale":"Tier 1-2 — reciprocal Co-IP, GST pulldown, ChIP, and functional reporter assays; multiple orthogonal methods","pmids":["22389001"],"is_preprint":false},{"year":2021,"finding":"CST7 expression in neutrophils (but not NK cells or CD8+ T cells) is specifically upregulated during acute inflammatory conditions in humans across a diverse set of infectious and non-infectious diseases. Known microbial products or cytokines fail to increase CST7 expression in neutrophils, suggesting induction by an endogenous serum factor present during inflammation.","method":"Multi-cohort transcriptome analysis (43 datasets), cell-type-specific expression analysis, stimulation experiments with microbial products/cytokines","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 3 — large-scale transcriptomics with negative stimulation experiments; mechanistic pathway not fully resolved","pmids":["33868254"],"is_preprint":false},{"year":2025,"finding":"In myocardial ischemia/reperfusion injury (MI/RI), the transcription factor SPI1 regulates CST7 expression in neutrophils. SPI1 promotes transition of neutrophils to MMP9High states that drive NET formation. Targeting SPI1 or CST7 significantly reduces MMP9High neutrophil prevalence and NET formation, resulting in improved MI/RI outcomes.","method":"Single-cell transcriptomics, SPI1 and CST7 targeting (functional intervention), NET formation assays, in vivo MI/RI model","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 — functional targeting of CST7 with defined cellular phenotype (NET formation, MMP9High neutrophils) and in vivo readout","pmids":["40151877"],"is_preprint":false},{"year":2024,"finding":"In chronic HBV infection, HBV upregulates CST7 expression in Th2 cells, which in turn promotes differentiation of naive CD4+ T cells into Th2 cells, contributing to chronic HBV. In vitro, HBV infection significantly upregulated CST7 expression, and scRNA-seq confirmed CST7 upregulation specifically in Th2 cells where it regulates Th2 differentiation.","method":"scRNA-seq, bulk RNA-seq, WGCNA, in vitro HBV infection experiments","journal":"Genes and immunity","confidence":"Low","confidence_rationale":"Tier 3 — in vitro HBV infection with expression readout; direct mechanistic proof of CST7 driving Th2 differentiation not established by loss-of-function","pmids":["39237681"],"is_preprint":false},{"year":2025,"finding":"In acute myeloid leukemia (AML), CST7 promotes cell proliferation and inhibits apoptosis, as confirmed by in vitro cell transfection experiments with flow cytometry readouts for apoptosis and proliferation assays.","method":"Cell transfection, cell proliferation assay, flow cytometry (apoptosis), scRNA-seq, Mendelian randomization","journal":"Molecular and cellular probes","confidence":"Low","confidence_rationale":"Tier 3 — single in vitro study with overexpression, limited mechanistic detail on how CST7 drives these phenotypes","pmids":["41448409"],"is_preprint":false},{"year":2025,"finding":"In Mycoplasma bovis-infected macrophages, CST7 regulates IFN-β expression. Overexpression and RNAi silencing of CST7 confirmed that it modulates IFN-β production in response to MbovP328 phosphodiesterase activity.","method":"Overexpression assay, RNAi silencing, RNA-sequencing, functional IFN-β measurement","journal":"International journal of biological macromolecules","confidence":"Low","confidence_rationale":"Tier 3 — gain- and loss-of-function for IFN-β expression, but context is non-mammalian pathogen and mechanism is not fully resolved","pmids":["40023422"],"is_preprint":false}],"current_model":"CST7 encodes cystatin F, a cysteine protease inhibitor expressed in hematopoietic and immune cells (particularly microglia, NK cells, neutrophils, and T cells) whose expression is transcriptionally controlled by C/EBPα and Runx2/G9a at its promoter; intracellularly, cystatin F localizes to endosomal/lysosomal vesicles where it directly inhibits cathepsins C, L, and S to regulate proteolytic activity, and in microglia its RIPK1-dependent induction drives an endolysosomal dysfunction contributing to the disease-associated microglia (DAM) state, impaired Aβ clearance, and neuroinflammation in Alzheimer's and other neurodegenerative disease models, while in the CNS cystatin F also attenuates T cell-driven neuroinflammation and promotes remyelination by suppressing chemoattractant and cytotoxic T cell gene programs."},"narrative":{"teleology":[{"year":2000,"claim":"Genomic characterization of CST7 revealed a four-exon gene at 20p11.21 with a promoter architecture lacking housekeeping elements, establishing the structural basis for its restricted hematopoietic expression pattern.","evidence":"FISH mapping and computational promoter analysis of human and mouse CST7 loci","pmids":["10945474"],"confidence":"Medium","gaps":["No functional promoter assays performed","Expression restriction inferred from promoter structure rather than demonstrated experimentally across tissues"]},{"year":2002,"claim":"Demonstration that cystatin F is partially retained intracellularly in granular cytoplasmic compartments (not ER) and is transcriptionally regulated by a C/EBPα binding site in its promoter resolved how this secreted-family member achieves intracellular function and lineage-restricted expression.","evidence":"Immunocytochemistry, immunofluorescence double-staining, promoter analysis, and differentiation assays in U937 promyeloid cells","pmids":["12423348"],"confidence":"High","gaps":["Identity of the granular compartment (endosome vs. lysosome) not resolved","Mechanism of intracellular retention unknown"]},{"year":2012,"claim":"Identification of Runx2 and its cofactor G9a as transcriptional regulators of CST7 in prostate cancer cells revealed a second transcriptional axis controlling CST7 expression, independent of C/EBPα, and showed that G9a's role is scaffold-based rather than catalytic.","evidence":"Reciprocal co-IP, GST pulldown, ChIP, siRNA knockdown, and reporter assays in C4-2B cells","pmids":["22389001"],"confidence":"High","gaps":["Runx2/G9a regulation of CST7 not confirmed in hematopoietic cells","Whether Runx2-driven CST7 expression has functional consequences for protease inhibition not tested"]},{"year":2017,"claim":"Two studies established Cst7 as a signature gene of disease-associated microglia: RIPK1 kinase-dependent induction of Cst7 impairs lysosomal degradation and Aβ clearance in AD models, while Cst7 is the most strongly upregulated transcript in early prion disease, positioning cystatin F as a central node in microglial endolysosomal dysfunction across neurodegeneration.","evidence":"Pharmacological/genetic RIPK1 inhibition in APP/PS1 mice with lysosomal assays; global transcriptional profiling and protein quantification across multiple prion mouse models","pmids":["28904096","28178353"],"confidence":"High","gaps":["Whether Cst7 induction is causally required for lysosomal impairment vs. a marker was not resolved in these studies","Upstream signal linking prion infection to Cst7 induction unknown"]},{"year":2018,"claim":"ChIP confirmed direct C/EBPα binding at the CST7 promoter in vivo, and co-IP/PLA identified cathepsins C, L, and S as the principal intracellular targets of cystatin F, establishing the complete transcription-to-target axis during monocyte differentiation.","evidence":"ChIP, co-immunoprecipitation, proximity ligation assay, and confocal microscopy in U937 and HL-60 cells during PMA-induced differentiation","pmids":["30033148"],"confidence":"High","gaps":["Relative contribution of each cathepsin to the differentiation phenotype not dissected","Whether cathepsin inhibition is the sole mechanism of cystatin F's biological effects not addressed"]},{"year":2021,"claim":"Multi-cohort analysis revealed that CST7 upregulation during acute inflammation is neutrophil-specific (not NK or CD8+ T cell) and is driven by an unidentified endogenous serum factor rather than by known microbial products or cytokines.","evidence":"Transcriptome analysis across 43 datasets, cell-type deconvolution, and negative stimulation experiments with microbial products and cytokines","pmids":["33868254"],"confidence":"Medium","gaps":["The endogenous serum factor inducing neutrophil CST7 remains unidentified","Functional consequence of neutrophil CST7 upregulation during inflammation not tested"]},{"year":2023,"claim":"Genetic loss-of-function of Cst7 in an amyloid AD model demonstrated that cystatin F functionally regulates endolysosomal activity, phagocytosis, and inflammatory state of microglia in a sex-dependent manner, resolving whether Cst7 is merely a DAM marker or an active driver.","evidence":"Cst7 knockout crossed with App amyloidosis model; in vivo amyloid and lysosomal burden, in vitro phagocytosis, transcriptomics with sex stratification","pmids":["38085657"],"confidence":"High","gaps":["Molecular basis for sex dimorphism in Cst7 function unknown","Which cathepsin target(s) mediate the sex-specific phenotypes not determined"]},{"year":2024,"claim":"Cst7 knockout in a viral CNS infection model showed that cystatin F limits neuroinflammation and demyelination by suppressing T cell chemoattractant and cytotoxic gene programs, establishing a CNS-protective, remyelination-promoting role independent of direct antiviral activity.","evidence":"Cst7−/− mice with intracranial JHMV infection; scRNA-seq, flow cytometry, histology, electron microscopy with g-ratio analysis","pmids":["38879499"],"confidence":"High","gaps":["Whether cystatin F acts cell-autonomously in microglia or also in infiltrating immune cells not resolved","Mechanism linking cathepsin inhibition to chemokine suppression not established"]},{"year":2025,"claim":"In myocardial ischemia/reperfusion, SPI1-driven CST7 expression promotes MMP9-high neutrophil states and NET formation, extending cystatin F's functional role beyond cathepsin inhibition to regulation of neutrophil effector programs in sterile inflammation.","evidence":"Single-cell transcriptomics, SPI1/CST7 targeting, NET formation assays, and in vivo MI/RI model","pmids":["40151877"],"confidence":"Medium","gaps":["Direct molecular mechanism linking CST7 to MMP9 expression and NET formation not delineated","Whether CST7's protease inhibitor activity is required for this function unknown"]},{"year":null,"claim":"The molecular mechanism by which cystatin F's cathepsin-inhibitory activity translates into regulation of chemokine expression, T cell programs, and NET formation remains unresolved, as does the basis for its sex-dependent effects in neurodegeneration.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of cystatin F–cathepsin complexes in endolysosomes","Endogenous serum factor inducing neutrophil CST7 during inflammation unidentified","Mechanism of sex dimorphism in Cst7 microglial function unexplained"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,2,3,4,5]}],"localization":[{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[0,2,3,4]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[2,3,4]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,2]},{"term_id":"GO:0005576","term_label":"extracellular region","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2,4,5,8,9]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,3,4]}],"complexes":[],"partners":["CTSC","CTSL","CTSS","CEBPA","RUNX2","EHMT2","RIPK1","SPI1"],"other_free_text":[]},"mechanistic_narrative":"CST7 encodes cystatin F, a cysteine protease inhibitor with restricted hematopoietic expression that regulates endolysosomal proteolytic activity, immune cell differentiation, and neuroinflammation. Intracellular cystatin F localizes to endosomal/lysosomal compartments where it directly inhibits cathepsins C, L, and S, thereby controlling proteolytic capacity during monocyte-to-macrophage differentiation under transcriptional regulation by C/EBPα and Runx2/G9a at the CST7 promoter [PMID:30033148, PMID:22389001, PMID:12423348]. In microglia, RIPK1-dependent induction of Cst7 drives endolysosomal dysfunction that impairs amyloid-β clearance and contributes to the disease-associated microglia (DAM) state, with sex-dependent effects on lysosomal burden and phagocytic capacity in Alzheimer's disease models [PMID:28904096, PMID:38085657]. In the CNS, cystatin F limits T cell–mediated neuroinflammation and promotes remyelination by suppressing chemokine (Cxcl9/Cxcl10) and cytotoxic effector gene expression, and in peripheral immunity it is upregulated in neutrophils during acute inflammation where it influences NET formation and MMP9-high neutrophil states [PMID:38879499, PMID:40151877]."},"prefetch_data":{"uniprot":{"accession":"O76096","full_name":"Cystatin-F","aliases":["Cystatin-7","Cystatin-like metastasis-associated protein","CMAP","Leukocystatin"],"length_aa":145,"mass_kda":16.5,"function":"Inhibits papain and cathepsin L but with affinities lower than other cystatins. May play a role in immune regulation through inhibition of a unique target in the hematopoietic system","subcellular_location":"Secreted; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O76096/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CST7","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CST7","total_profiled":1310},"omim":[{"mim_id":"615884","title":"ADIPOCYTE PLASMA MEMBRANE-ASSOCIATED PROTEIN; APMAP","url":"https://www.omim.org/entry/615884"},{"mim_id":"603253","title":"CYSTATIN 7; CST7","url":"https://www.omim.org/entry/603253"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":1033.4}],"url":"https://www.proteinatlas.org/search/CST7"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"O76096","domains":[{"cath_id":"3.10.450.10","chopping":"41-145","consensus_level":"high","plddt":97.7296,"start":41,"end":145}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O76096","model_url":"https://alphafold.ebi.ac.uk/files/AF-O76096-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O76096-F1-predicted_aligned_error_v6.png","plddt_mean":88.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CST7","jax_strain_url":"https://www.jax.org/strain/search?query=CST7"},"sequence":{"accession":"O76096","fasta_url":"https://rest.uniprot.org/uniprotkb/O76096.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O76096/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O76096"}},"corpus_meta":[{"pmid":"28904096","id":"PMC_28904096","title":"RIPK1 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Immunocytochemistry demonstrated granular cytoplasmic localization that does not colocalize with endoplasmic reticulum markers. The promoter region of CST7 contains a unique C/EBPα binding site (absent in cystatin C promoter), explaining its restricted hematopoietic expression. Treatment with all-trans retinoic acid caused ~18-fold down-regulation of intracellular cystatin F during granulocytic differentiation.\",\n      \"method\": \"Immunocytochemistry, immunofluorescence double-staining, promoter analysis, protein purification from cell lysates, differentiation assays\",\n      \"journal\": \"European journal of biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (localization, promoter analysis, protein purification) in single study with rigorous controls\",\n      \"pmids\": [\"12423348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The CST7 gene (encoding cystatin F/CMAP/leukocystatin) is located at human genomic locus 20p11.21-p11.22 (mouse chromosome 2G1-G3), is constructed from four exons encoding functional domains, and its promoter lacks typical TATA/CAAT-box elements and CpG-rich island characteristics of housekeeping genes, consistent with restricted hematopoietic expression.\",\n      \"method\": \"FISH analysis, genomic cloning, computational promoter analysis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — FISH and genomic characterization; single study\",\n      \"pmids\": [\"10945474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The transcription factor C/EBPα directly binds the CST7 gene promoter in U937 cells (shown by chromatin immunoprecipitation assay) and regulates cystatin F expression during monocyte-to-macrophage differentiation. Following PMA-induced differentiation, C/EBPα binding to the CST7 promoter decreased significantly, concurrent with decreased C/EBPα protein levels and reduced cystatin F expression, allowing increased endolysosomal cathepsin C, L, and S activity. Co-immunoprecipitation, proximity ligation assay, and immunofluorescence confirmed cathepsins C, L, and S as the main interacting partners of cystatin F in U937 and HL-60 cells.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), co-immunoprecipitation, proximity ligation assay, immunofluorescence confocal microscopy, differentiation assays\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — ChIP directly showing transcription factor binding, combined with co-IP and PLA confirming protein-protein interactions, multiple orthogonal methods\",\n      \"pmids\": [\"30033148\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RIPK1 kinase activity in microglia regulates the transcriptional induction of Cst7 (cystatin F) in disease-associated microglia (DAM). Pharmacological and genetic inhibition of RIPK1 in APP/PS1 mice reduced Cst7 expression. RIPK1-mediated induction of Cst7 leads to impairment of the lysosomal pathway in microglia, contributing to reduced Aβ phagocytic/degradation capacity.\",\n      \"method\": \"Pharmacological inhibition, genetic knockout, transcriptional profiling, in vitro lysosomal degradation assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — both pharmacological and genetic RIPK1 inhibition with transcriptional and functional readouts, replicated across multiple approaches\",\n      \"pmids\": [\"28904096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cst7 (cystatin F) plays a sexually dimorphic role in microglia in an amyloid-driven Alzheimer's disease model. In female Cst7-knockout × App mice, microglia had greater endolysosomal gene expression, lysosomal burden, and amyloid beta (Aβ) burden in vivo, and were more phagocytic in vitro. In males, Cst7-knockout microglia were less inflammatory and had reduced lysosomal burden without change in Aβ burden. This establishes Cst7 as a functional regulator of endolysosomal activity and inflammatory state in microglia in a sex-dependent manner.\",\n      \"method\": \"Cst7 knockout mouse crossed with App amyloidosis model, in vivo amyloid burden measurement, lysosomal burden assay, in vitro phagocytosis assay, transcriptomics\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function with multiple cellular and in vivo phenotypic readouts, sex-stratified analysis\",\n      \"pmids\": [\"38085657\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Cystatin F (encoded by Cst7) attenuates neuroinflammation and demyelination in a murine coronavirus (JHMV) CNS infection model. Cst7-/- mice showed increased T cell infiltration into the spinal cord, increased axonal damage, increased demyelination, and impaired remyelination compared to controls. Single-cell RNA-seq revealed elevated expression of T cell chemoattractants Cxcl9 and Cxcl10 and increased Ifng and Prf1 transcripts in CD8+ T cells from Cst7-/- mice, indicating cystatin F limits neuroinflammation by suppressing chemoattractant and cytotoxic T cell gene expression. Viral replication was not affected by Cst7 loss, indicating the phenotype is immune-modulatory not anti-viral.\",\n      \"method\": \"Cst7-/- mouse model, intracranial viral infection, flow cytometry, single-cell RNA-seq, viral plaque assay, histology (luxol fast blue, H&E, SMI-32 IHC), electron microscopy with g-ratio\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic loss-of-function with multiple orthogonal readouts (histology, flow cytometry, scRNA-seq, EM) in a defined disease model\",\n      \"pmids\": [\"38879499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Cst7 mRNA is the most strongly upregulated transcript in brains of pre-symptomatic prion-infected mice, and its cognate protein (cystatin F) is also robustly elevated early in disease. This was validated across multiple mouse prion disease models. Cst7/cystatin F induction is an early biomarker of prion pathogenesis in mice, preceding clinical signs.\",\n      \"method\": \"Global transcriptional profiling, RT-qPCR validation, protein quantification, multiple prion mouse models\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — replicated across multiple prion models, but functional mechanism of Cst7 induction in this context not directly interrogated\",\n      \"pmids\": [\"28178353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CST7 expression in prostate cancer cells (C4-2B) is a downstream target of Runx2 transcription factor, and its induction by Runx2 requires recruitment of the histone methyltransferase G9a to Runx2 binding sites at the CST7 locus. G9a co-immunoprecipitates with Runx2, and G9a depletion reduces CST7 expression. The histone methyltransferase activity of G9a is not required for this transcriptional activation.\",\n      \"method\": \"Co-immunoprecipitation, GST-pulldown, chromatin immunoprecipitation (ChIP), siRNA knockdown, reporter assay, FRAP\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reciprocal Co-IP, GST pulldown, ChIP, and functional reporter assays; multiple orthogonal methods\",\n      \"pmids\": [\"22389001\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CST7 expression in neutrophils (but not NK cells or CD8+ T cells) is specifically upregulated during acute inflammatory conditions in humans across a diverse set of infectious and non-infectious diseases. Known microbial products or cytokines fail to increase CST7 expression in neutrophils, suggesting induction by an endogenous serum factor present during inflammation.\",\n      \"method\": \"Multi-cohort transcriptome analysis (43 datasets), cell-type-specific expression analysis, stimulation experiments with microbial products/cytokines\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — large-scale transcriptomics with negative stimulation experiments; mechanistic pathway not fully resolved\",\n      \"pmids\": [\"33868254\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In myocardial ischemia/reperfusion injury (MI/RI), the transcription factor SPI1 regulates CST7 expression in neutrophils. SPI1 promotes transition of neutrophils to MMP9High states that drive NET formation. Targeting SPI1 or CST7 significantly reduces MMP9High neutrophil prevalence and NET formation, resulting in improved MI/RI outcomes.\",\n      \"method\": \"Single-cell transcriptomics, SPI1 and CST7 targeting (functional intervention), NET formation assays, in vivo MI/RI model\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional targeting of CST7 with defined cellular phenotype (NET formation, MMP9High neutrophils) and in vivo readout\",\n      \"pmids\": [\"40151877\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In chronic HBV infection, HBV upregulates CST7 expression in Th2 cells, which in turn promotes differentiation of naive CD4+ T cells into Th2 cells, contributing to chronic HBV. In vitro, HBV infection significantly upregulated CST7 expression, and scRNA-seq confirmed CST7 upregulation specifically in Th2 cells where it regulates Th2 differentiation.\",\n      \"method\": \"scRNA-seq, bulk RNA-seq, WGCNA, in vitro HBV infection experiments\",\n      \"journal\": \"Genes and immunity\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — in vitro HBV infection with expression readout; direct mechanistic proof of CST7 driving Th2 differentiation not established by loss-of-function\",\n      \"pmids\": [\"39237681\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In acute myeloid leukemia (AML), CST7 promotes cell proliferation and inhibits apoptosis, as confirmed by in vitro cell transfection experiments with flow cytometry readouts for apoptosis and proliferation assays.\",\n      \"method\": \"Cell transfection, cell proliferation assay, flow cytometry (apoptosis), scRNA-seq, Mendelian randomization\",\n      \"journal\": \"Molecular and cellular probes\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — single in vitro study with overexpression, limited mechanistic detail on how CST7 drives these phenotypes\",\n      \"pmids\": [\"41448409\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In Mycoplasma bovis-infected macrophages, CST7 regulates IFN-β expression. Overexpression and RNAi silencing of CST7 confirmed that it modulates IFN-β production in response to MbovP328 phosphodiesterase activity.\",\n      \"method\": \"Overexpression assay, RNAi silencing, RNA-sequencing, functional IFN-β measurement\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 — gain- and loss-of-function for IFN-β expression, but context is non-mammalian pathogen and mechanism is not fully resolved\",\n      \"pmids\": [\"40023422\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CST7 encodes cystatin F, a cysteine protease inhibitor expressed in hematopoietic and immune cells (particularly microglia, NK cells, neutrophils, and T cells) whose expression is transcriptionally controlled by C/EBPα and Runx2/G9a at its promoter; intracellularly, cystatin F localizes to endosomal/lysosomal vesicles where it directly inhibits cathepsins C, L, and S to regulate proteolytic activity, and in microglia its RIPK1-dependent induction drives an endolysosomal dysfunction contributing to the disease-associated microglia (DAM) state, impaired Aβ clearance, and neuroinflammation in Alzheimer's and other neurodegenerative disease models, while in the CNS cystatin F also attenuates T cell-driven neuroinflammation and promotes remyelination by suppressing chemoattractant and cytotoxic T cell gene programs.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CST7 encodes cystatin F, a cysteine protease inhibitor with restricted hematopoietic expression that regulates endolysosomal proteolytic activity, immune cell differentiation, and neuroinflammation. Intracellular cystatin F localizes to endosomal/lysosomal compartments where it directly inhibits cathepsins C, L, and S, thereby controlling proteolytic capacity during monocyte-to-macrophage differentiation under transcriptional regulation by C/EBPα and Runx2/G9a at the CST7 promoter [PMID:30033148, PMID:22389001, PMID:12423348]. In microglia, RIPK1-dependent induction of Cst7 drives endolysosomal dysfunction that impairs amyloid-β clearance and contributes to the disease-associated microglia (DAM) state, with sex-dependent effects on lysosomal burden and phagocytic capacity in Alzheimer's disease models [PMID:28904096, PMID:38085657]. In the CNS, cystatin F limits T cell–mediated neuroinflammation and promotes remyelination by suppressing chemokine (Cxcl9/Cxcl10) and cytotoxic effector gene expression, and in peripheral immunity it is upregulated in neutrophils during acute inflammation where it influences NET formation and MMP9-high neutrophil states [PMID:38879499, PMID:40151877].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Genomic characterization of CST7 revealed a four-exon gene at 20p11.21 with a promoter architecture lacking housekeeping elements, establishing the structural basis for its restricted hematopoietic expression pattern.\",\n      \"evidence\": \"FISH mapping and computational promoter analysis of human and mouse CST7 loci\",\n      \"pmids\": [\"10945474\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional promoter assays performed\", \"Expression restriction inferred from promoter structure rather than demonstrated experimentally across tissues\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Demonstration that cystatin F is partially retained intracellularly in granular cytoplasmic compartments (not ER) and is transcriptionally regulated by a C/EBPα binding site in its promoter resolved how this secreted-family member achieves intracellular function and lineage-restricted expression.\",\n      \"evidence\": \"Immunocytochemistry, immunofluorescence double-staining, promoter analysis, and differentiation assays in U937 promyeloid cells\",\n      \"pmids\": [\"12423348\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the granular compartment (endosome vs. lysosome) not resolved\", \"Mechanism of intracellular retention unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identification of Runx2 and its cofactor G9a as transcriptional regulators of CST7 in prostate cancer cells revealed a second transcriptional axis controlling CST7 expression, independent of C/EBPα, and showed that G9a's role is scaffold-based rather than catalytic.\",\n      \"evidence\": \"Reciprocal co-IP, GST pulldown, ChIP, siRNA knockdown, and reporter assays in C4-2B cells\",\n      \"pmids\": [\"22389001\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Runx2/G9a regulation of CST7 not confirmed in hematopoietic cells\", \"Whether Runx2-driven CST7 expression has functional consequences for protease inhibition not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Two studies established Cst7 as a signature gene of disease-associated microglia: RIPK1 kinase-dependent induction of Cst7 impairs lysosomal degradation and Aβ clearance in AD models, while Cst7 is the most strongly upregulated transcript in early prion disease, positioning cystatin F as a central node in microglial endolysosomal dysfunction across neurodegeneration.\",\n      \"evidence\": \"Pharmacological/genetic RIPK1 inhibition in APP/PS1 mice with lysosomal assays; global transcriptional profiling and protein quantification across multiple prion mouse models\",\n      \"pmids\": [\"28904096\", \"28178353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Cst7 induction is causally required for lysosomal impairment vs. a marker was not resolved in these studies\", \"Upstream signal linking prion infection to Cst7 induction unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"ChIP confirmed direct C/EBPα binding at the CST7 promoter in vivo, and co-IP/PLA identified cathepsins C, L, and S as the principal intracellular targets of cystatin F, establishing the complete transcription-to-target axis during monocyte differentiation.\",\n      \"evidence\": \"ChIP, co-immunoprecipitation, proximity ligation assay, and confocal microscopy in U937 and HL-60 cells during PMA-induced differentiation\",\n      \"pmids\": [\"30033148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of each cathepsin to the differentiation phenotype not dissected\", \"Whether cathepsin inhibition is the sole mechanism of cystatin F's biological effects not addressed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Multi-cohort analysis revealed that CST7 upregulation during acute inflammation is neutrophil-specific (not NK or CD8+ T cell) and is driven by an unidentified endogenous serum factor rather than by known microbial products or cytokines.\",\n      \"evidence\": \"Transcriptome analysis across 43 datasets, cell-type deconvolution, and negative stimulation experiments with microbial products and cytokines\",\n      \"pmids\": [\"33868254\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The endogenous serum factor inducing neutrophil CST7 remains unidentified\", \"Functional consequence of neutrophil CST7 upregulation during inflammation not tested\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Genetic loss-of-function of Cst7 in an amyloid AD model demonstrated that cystatin F functionally regulates endolysosomal activity, phagocytosis, and inflammatory state of microglia in a sex-dependent manner, resolving whether Cst7 is merely a DAM marker or an active driver.\",\n      \"evidence\": \"Cst7 knockout crossed with App amyloidosis model; in vivo amyloid and lysosomal burden, in vitro phagocytosis, transcriptomics with sex stratification\",\n      \"pmids\": [\"38085657\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis for sex dimorphism in Cst7 function unknown\", \"Which cathepsin target(s) mediate the sex-specific phenotypes not determined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Cst7 knockout in a viral CNS infection model showed that cystatin F limits neuroinflammation and demyelination by suppressing T cell chemoattractant and cytotoxic gene programs, establishing a CNS-protective, remyelination-promoting role independent of direct antiviral activity.\",\n      \"evidence\": \"Cst7−/− mice with intracranial JHMV infection; scRNA-seq, flow cytometry, histology, electron microscopy with g-ratio analysis\",\n      \"pmids\": [\"38879499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether cystatin F acts cell-autonomously in microglia or also in infiltrating immune cells not resolved\", \"Mechanism linking cathepsin inhibition to chemokine suppression not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"In myocardial ischemia/reperfusion, SPI1-driven CST7 expression promotes MMP9-high neutrophil states and NET formation, extending cystatin F's functional role beyond cathepsin inhibition to regulation of neutrophil effector programs in sterile inflammation.\",\n      \"evidence\": \"Single-cell transcriptomics, SPI1/CST7 targeting, NET formation assays, and in vivo MI/RI model\",\n      \"pmids\": [\"40151877\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular mechanism linking CST7 to MMP9 expression and NET formation not delineated\", \"Whether CST7's protease inhibitor activity is required for this function unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular mechanism by which cystatin F's cathepsin-inhibitory activity translates into regulation of chemokine expression, T cell programs, and NET formation remains unresolved, as does the basis for its sex-dependent effects in neurodegeneration.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of cystatin F–cathepsin complexes in endolysosomes\", \"Endogenous serum factor inducing neutrophil CST7 during inflammation unidentified\", \"Mechanism of sex dimorphism in Cst7 microglial function unexplained\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\n        \"term_id\": \"GO:0098772\",\n        \"supporting_discovery_ids\": [0, 2, 3, 4, 5]\n      }\n    ],\n    \"localization\": [\n      {\n        \"term_id\": \"GO:0005768\",\n        \"supporting_discovery_ids\": [0, 2, 3, 4]\n      },\n      {\n        \"term_id\": \"GO:0005764\",\n        \"supporting_discovery_ids\": [2, 3, 4]\n      },\n      {\n        \"term_id\": \"GO:0031410\",\n        \"supporting_discovery_ids\": [0, 2]\n      },\n      {\n        \"term_id\": \"GO:0005576\",\n        \"supporting_discovery_ids\": [0]\n      }\n    ],\n    \"pathway\": [\n      {\n        \"term_id\": \"R-HSA-168256\",\n        \"supporting_discovery_ids\": [2, 4, 5, 8, 9]\n      },\n      {\n        \"term_id\": \"R-HSA-392499\",\n        \"supporting_discovery_ids\": [2, 3, 4]\n      }\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CTSC\",\n      \"CTSL\",\n      \"CTSS\",\n      \"CEBPA\",\n      \"RUNX2\",\n      \"EHMT2\",\n      \"RIPK1\",\n      \"SPI1\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}