{"gene":"CTSG","run_date":"2026-06-09T22:57:19","timeline":{"discoveries":[{"year":2021,"finding":"Cathepsin G (CTSG), along with neutrophil elastase (ELANE) and proteinase 3 (PRTN3), catalyzes proteolytic cleavage of the histone H3 amino terminus (H3ΔN) in human peripheral blood monocytes. This histone mark is abundant in monocytes and becomes largely undetectable upon differentiation into macrophages, correlating with NSP repression. Simultaneous depletion of all three NSPs in monocytic cells caused H3ΔN loss and increased chromatin accessibility, implicating CTSG-mediated H3 cleavage as an epigenetic mechanism that primes chromatin during monocyte-to-macrophage differentiation.","method":"Integrative epigenomic analysis, NSP depletion (loss-of-function), chromatin accessibility assays, and identification of H3ΔN as a substrate of CTSG/ELANE/PRTN3 in primary monocytes and monocytic cell lines","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional validation with simultaneous NSP depletion, integrative epigenomic analysis, and defined cellular phenotype (H3ΔN loss, increased chromatin accessibility) with multiple orthogonal methods in a single rigorous study","pmids":["34017121"],"is_preprint":false},{"year":2023,"finding":"CTSG overexpression suppressed colorectal cancer (CRC) cell proliferation and tumor growth in vitro and in vivo, acting via suppression of Akt/mTOR signaling and elevation of apoptotic markers including Bcl2 downregulation. Pharmacological inhibition of Akt (MK2206) abolished the pro-survival effects of CTSG silencing, placing CTSG upstream of the Akt/mTOR/Bcl2 anti-apoptotic axis.","method":"Gain- and loss-of-function experiments (CTSG overexpression and knockdown) in CRC cell lines and xenograft models; Akt inhibitor (MK2206) epistasis; Western blot for pathway markers","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo loss/gain-of-function with epistasis experiment (MK2206 rescue), single lab, multiple orthogonal readouts","pmids":["37151875"],"is_preprint":false},{"year":2012,"finding":"CTSG regulatory elements drive expression of PML-RARA not only in promyelocytes but also in hematopoietic stem/progenitor cells (KLS: Kit+Lin−Sca+) in Ctsg-PML-RARA transgenic mice. Endogenous Ctsg is expressed in KLS cells, and PML-RARA targeted to the Ctsg locus exerts biological effects on multi-lineage competitive repopulation and alters the transcriptional signature of early myeloid progenitors (CMPs and GMPs), demonstrating that CTSG is expressed and functionally active in multipotent progenitors, not solely in promyelocytes.","method":"Transgenic mouse model (Ctsg-PML-RARA knockin), purified HSPC and progenitor cell analysis, competitive repopulation assays, transcriptome analysis of sorted myeloid progenitors","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vivo genetic model with FACS-sorted cell populations and functional readout, single lab, defines CTSG expression domain in hematopoietic hierarchy","pmids":["23056333"],"is_preprint":false}],"current_model":"Cathepsin G (CTSG) is a neutrophil serine protease expressed in myeloid cells (including hematopoietic progenitors and monocytes) that catalyzes proteolytic cleavage of the histone H3 amino terminus (H3ΔN) in monocytes—a chromatin-priming mark that is repressed during monocyte-to-macrophage differentiation—and that acts as a tumor suppressor in colorectal cancer by suppressing the Akt/mTOR/Bcl2 anti-apoptotic signaling axis."},"narrative":{"mechanistic_narrative":"Cathepsin G (CTSG) is a myeloid serine protease whose proteolytic activity has been linked to chromatin remodeling during monocyte differentiation and to tumor-suppressive signaling [PMID:34017121, PMID:37151875]. Together with neutrophil elastase (ELANE) and proteinase 3 (PRTN3), CTSG cleaves the histone H3 amino terminus (H3ΔN) in primary human monocytes; this mark is abundant in monocytes and lost upon macrophage differentiation, and simultaneous depletion of the three proteases abolishes H3ΔN and increases chromatin accessibility, implicating CTSG-mediated H3 cleavage as an epigenetic priming mechanism in the monocyte-to-macrophage transition [PMID:34017121]. CTSG expression is not confined to mature myeloid cells: its regulatory elements are active in hematopoietic stem/progenitor cells, and endogenous Ctsg is functionally expressed across early myeloid progenitors [PMID:23056333]. In colorectal cancer, CTSG acts as a tumor suppressor, restraining proliferation and tumor growth by suppressing the Akt/mTOR/Bcl2 anti-apoptotic axis, with Akt inhibition epistatically abolishing the pro-survival effects of CTSG loss [PMID:37151875].","teleology":[{"year":2012,"claim":"Defining where in the hematopoietic hierarchy CTSG is expressed established that it is active not only in promyelocytes but in multipotent progenitors, refining its expression domain and the cellular context of its activity.","evidence":"Ctsg-PML-RARA transgenic knockin mice, FACS-sorted HSPC/progenitor analysis, competitive repopulation and progenitor transcriptome profiling","pmids":["23056333"],"confidence":"Medium","gaps":["Does not characterize a proteolytic substrate or molecular function of CTSG in progenitors","Effects observed via PML-RARA expression driven by CTSG elements, not via CTSG protein activity itself"]},{"year":2021,"claim":"Identification of histone H3 N-terminal cleavage (H3ΔN) as a CTSG/ELANE/PRTN3-catalyzed mark answered whether these proteases have a nuclear, chromatin-directed role, establishing CTSG as an epigenetic effector that primes chromatin during monocyte-to-macrophage differentiation.","evidence":"Integrative epigenomics, simultaneous NSP depletion (loss-of-function), and chromatin accessibility assays in primary monocytes and monocytic cell lines","pmids":["34017121"],"confidence":"High","gaps":["Relative contribution of CTSG versus ELANE and PRTN3 to H3 cleavage not individually resolved","How a granule-associated protease accesses nuclear chromatin is not addressed","Downstream transcriptional consequences of H3ΔN priming not fully mapped"]},{"year":2023,"claim":"Gain- and loss-of-function in colorectal cancer placed CTSG upstream of the Akt/mTOR/Bcl2 axis, establishing a tumor-suppressive role distinct from its myeloid functions.","evidence":"CTSG overexpression and knockdown in CRC cell lines and xenografts, MK2206 (Akt inhibitor) epistasis, and Western blot of pathway markers","pmids":["37151875"],"confidence":"Medium","gaps":["Whether CTSG protease activity or a non-catalytic function drives Akt suppression is unresolved","Direct molecular target linking CTSG to Akt/mTOR not identified","Single-lab finding without independent replication"]},{"year":null,"claim":"How CTSG proteolytic activity is mechanistically connected to its distinct roles in chromatin priming and Akt/mTOR suppression, and what its direct substrates are in each context, remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying substrate or mechanism linking myeloid chromatin and CRC signaling roles","Mechanism of nuclear access and substrate specificity uncharacterized"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0]}],"localization":[],"pathway":[{"term_id":"R-HSA-4839726","term_label":"Chromatin organization","supporting_discovery_ids":[0]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P08311","full_name":"Cathepsin G","aliases":[],"length_aa":255,"mass_kda":28.8,"function":"Serine protease with trypsin- and chymotrypsin-like specificity (PubMed:29652924, PubMed:8194606). Also displays antibacterial activity against Gram-negative and Gram-positive bacteria independent of its protease activity (PubMed:2116408, PubMed:2117044). Prefers Phe and Tyr residues in the P1 position of substrates but also cleaves efficiently after Trp and Leu (PubMed:29652924). Shows a preference for negatively charged amino acids in the P2' position and for aliphatic amino acids both upstream and downstream of the cleavage site (PubMed:29652924). Required for recruitment and activation of platelets which is mediated by the F2RL3/PAR4 platelet receptor (PubMed:10702240, PubMed:3390156). Binds reversibly to and stimulates B cells and CD4(+) and CD8(+) T cells (PubMed:7842483, PubMed:9000539). Also binds reversibly to natural killer (NK) cells and enhances NK cell cytotoxicity through its protease activity (PubMed:9000539, PubMed:9536127). Cleaves complement C3 (PubMed:1861080). Cleaves vimentin (By similarity). Cleaves thrombin receptor F2R/PAR1 and acts as either an agonist or an inhibitor, depending on the F2R cleavage site (PubMed:10702240, PubMed:7744748). Cleavage of F2R at '41-Arg-|-Ser-42' results in receptor activation while cleavage at '55-Phe-|-Trp-56' results in inhibition of receptor activation (PubMed:7744748). Cleaves the synovial mucin-type protein PRG4/lubricin (PubMed:32144329). Cleaves and activates IL36G which promotes expression of chemokines CXCL1 and CXLC8 in keratinocytes (PubMed:30804664). Cleaves IL33 into mature forms which have greater activity than the unprocessed form (PubMed:22307629). Cleaves coagulation factor F8 to produce a partially activated form (PubMed:18217133). Also cleaves and activates coagulation factor F10 (PubMed:8920993). Cleaves leukocyte cell surface protein SPN/CD43 to release its extracellular domain and trigger its intramembrane proteolysis by gamma-secretase, releasing the CD43 cytoplasmic tail chain (CD43-ct) which translocates to the nucleus (PubMed:18586676). Cleaves CCL5/RANTES to produce RANTES(4-68) lacking the N-terminal three amino acids which exhibits reduced chemotactic and antiviral activities (PubMed:16963625). During apoptosis, cleaves SMARCA2/BRM to produce a 160 kDa cleavage product which localizes to the cytosol (PubMed:11259672). Cleaves myelin basic protein MBP in B cell lysosomes at '224-Phe-|-Lys-225' and '248-Phe-|-Ser-249', degrading the major immunogenic MBP epitope and preventing the activation of MBP-specific autoreactive T cells (PubMed:15100291). Cleaves annexin ANXA1 and antimicrobial peptide CAMP to produce peptides which act on neutrophil N-formyl peptide receptors to enhance the release of CXCL2 (PubMed:22879591). Acts as a ligand for the N-formyl peptide receptor FPR1, enhancing phagocyte chemotaxis (PubMed:15210802). Has antibacterial activity against the Gram-negative bacteria N.gonorrhoeae and P.aeruginosa (PubMed:1937776, PubMed:2116408). Likely to act against N.gonorrhoeae by interacting with N.gonorrhoeae penA/PBP2 (PubMed:2126324). Exhibits potent antimicrobial activity against the Gram-positive bacterium L.monocytogenes (PubMed:2117044). Has antibacterial activity against the Gram-positive bacterium S.aureus and degrades S.aureus biofilms, allowing polymorphonuclear leukocytes to penetrate the biofilm and phagocytose bacteria (PubMed:2117044, PubMed:32995850). Has antibacterial activity against M.tuberculosis (PubMed:15385470). Mediates CASP4 activation induced by the Td92 surface protein of the periodontal pathogen T.denticola, causing production and secretion of IL1A and leading to pyroptosis of gingival fibroblasts (PubMed:29077095). Induces platelet aggregation which is strongly potentiated in the presence of ELANE (PubMed:25211214, PubMed:9111081)","subcellular_location":"Cell membrane; Cytoplasmic granule; Secreted; Cytoplasm, cytosol; Lysosome; Nucleus","url":"https://www.uniprot.org/uniprotkb/P08311/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CTSG","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CTSG","total_profiled":1310},"omim":[{"mim_id":"604036","title":"CYCLIN A1; CCNA1","url":"https://www.omim.org/entry/604036"},{"mim_id":"603348","title":"HYPOXIA-INDUCIBLE FACTOR 1, ALPHA SUBUNIT; HIF1A","url":"https://www.omim.org/entry/603348"},{"mim_id":"136351","title":"FMS-RELATED TYROSINE KINASE 3; FLT3","url":"https://www.omim.org/entry/136351"},{"mim_id":"130130","title":"ELASTASE, NEUTROPHIL-EXPRESSED; ELANE","url":"https://www.omim.org/entry/130130"},{"mim_id":"118938","title":"CHYMASE 1; CMA1","url":"https://www.omim.org/entry/118938"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":5049.0}],"url":"https://www.proteinatlas.org/search/CTSG"},"hgnc":{"alias_symbol":["CG"],"prev_symbol":[]},"alphafold":{"accession":"P08311","domains":[{"cath_id":"2.40.10.10","chopping":"34-127_236-249","consensus_level":"medium","plddt":95.9178,"start":34,"end":249},{"cath_id":"2.40.10.10","chopping":"141-233","consensus_level":"medium","plddt":95.7245,"start":141,"end":233}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P08311","model_url":"https://alphafold.ebi.ac.uk/files/AF-P08311-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P08311-F1-predicted_aligned_error_v6.png","plddt_mean":91.38},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CTSG","jax_strain_url":"https://www.jax.org/strain/search?query=CTSG"},"sequence":{"accession":"P08311","fasta_url":"https://rest.uniprot.org/uniprotkb/P08311.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P08311/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P08311"}},"corpus_meta":[{"pmid":"28953888","id":"PMC_28953888","title":"CG 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transcription of CTSG via antisense lncRNA AL136018.1 in dermatomyositic myoideum.","date":"2020","source":"Cell biology international","url":"https://pubmed.ncbi.nlm.nih.gov/33245176","citation_count":12,"is_preprint":false},{"pmid":"34247447","id":"PMC_34247447","title":"Pten Regulates Cardiomyocyte Differentiation by Modulating Non-CG Methylation via Dnmt3.","date":"2021","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/34247447","citation_count":12,"is_preprint":false},{"pmid":"37577397","id":"PMC_37577397","title":"CG hypermethylation of the bHLH39 promoter regulates its expression and Fe deficiency responses in tomato roots.","date":"2023","source":"Horticulture research","url":"https://pubmed.ncbi.nlm.nih.gov/37577397","citation_count":11,"is_preprint":false},{"pmid":"36454012","id":"PMC_36454012","title":"Recognition of 5-methyl-CG and CG base pairs in duplex DNA with high stability using antiparallel-type triplex-forming oligonucleotides with 2-guanidinoethyl-2'-deoxynebularine.","date":"2022","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/36454012","citation_count":11,"is_preprint":false},{"pmid":"35809677","id":"PMC_35809677","title":"Biophysical interaction between lanthanum chloride and (CG)n or (GC)n repeats: A reversible B-to-Z DNA transition.","date":"2022","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/35809677","citation_count":11,"is_preprint":false},{"pmid":"35499387","id":"PMC_35499387","title":"Luxeptinib (CG-806) Targets FLT3 and Clusters of Kinases Operative in Acute Myeloid Leukemia.","date":"2022","source":"Molecular cancer therapeutics","url":"https://pubmed.ncbi.nlm.nih.gov/35499387","citation_count":10,"is_preprint":false},{"pmid":"9833610","id":"PMC_9833610","title":"Gene, interaction, signal generation, signal divergence and signal transduction of the LH/CG receptor.","date":"1998","source":"International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics","url":"https://pubmed.ncbi.nlm.nih.gov/9833610","citation_count":10,"is_preprint":false},{"pmid":"27573482","id":"PMC_27573482","title":"Mammalian non-CG methylations are conserved and cell-type specific and may have been involved in the evolution of transposon elements.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/27573482","citation_count":10,"is_preprint":false},{"pmid":"32995794","id":"PMC_32995794","title":"COVID-19 CG: Tracking SARS-CoV-2 mutations by locations and dates of interest.","date":"2020","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/32995794","citation_count":10,"is_preprint":false},{"pmid":"23414321","id":"PMC_23414321","title":"Analysis of promoter non-CG methylation in prostate cancer.","date":"2013","source":"Epigenomics","url":"https://pubmed.ncbi.nlm.nih.gov/23414321","citation_count":9,"is_preprint":false},{"pmid":"24827388","id":"PMC_24827388","title":"Characterising the atypical 5'-CG DNA sequence specificity of 9-aminoacridine carboxamide Pt complexes.","date":"2014","source":"Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/24827388","citation_count":9,"is_preprint":false},{"pmid":"36508709","id":"PMC_36508709","title":"Effect of the Thermal Fluctuations of the Photophysics of GC and CG DNA Steps: A Computational Dynamical Study.","date":"2022","source":"The journal of physical chemistry. B","url":"https://pubmed.ncbi.nlm.nih.gov/36508709","citation_count":9,"is_preprint":false},{"pmid":"37206627","id":"PMC_37206627","title":"On the prediction of non-CG DNA methylation using machine learning.","date":"2023","source":"NAR genomics and bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/37206627","citation_count":8,"is_preprint":false},{"pmid":"9027348","id":"PMC_9027348","title":"Structure and functional significance of the carbohydrates of the LH/CG receptor.","date":"1996","source":"Molecular and cellular endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/9027348","citation_count":8,"is_preprint":false},{"pmid":"37926286","id":"PMC_37926286","title":"DNA conformational dynamics in the context-dependent non-CG CHH methylation by plant methyltransferase DRM2.","date":"2023","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/37926286","citation_count":8,"is_preprint":false},{"pmid":"28986316","id":"PMC_28986316","title":"Presence of a consensus DNA motif at nearby DNA sequence of the mutation susceptible CG nucleotides.","date":"2017","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/28986316","citation_count":8,"is_preprint":false},{"pmid":"39650644","id":"PMC_39650644","title":"TLR7 rs179008 (A/T) and TLR7 rs3853839 (C/G) polymorphisms are associated with variations in IFN-α levels in HTLV-1 infection.","date":"2024","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/39650644","citation_count":8,"is_preprint":false},{"pmid":"12569177","id":"PMC_12569177","title":"Expression of beta hCG and alpha CG mRNA and hCG hormone in human decidual tissue in patients during tubal pregnancy.","date":"2003","source":"Molecular human reproduction","url":"https://pubmed.ncbi.nlm.nih.gov/12569177","citation_count":8,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50202,"output_tokens":1571,"usd":0.087085,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":7721,"output_tokens":1710,"usd":0.040677,"stage2_stop_reason":"end_turn"},"total_usd":0.127762,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the abstracts, I need to identify papers about CTSG (Cathepsin G, the human serine protease). Let me classify each paper:\n\n- Papers 1-13, 15, 18, 22, 24, 26-28, 30-32, 34-43, 52, 54, 57, 59, 61, 63, 67, 69-71, 73-75, 80-81, 84-87, 90, 92-95, 97-98: About CG dinucleotides, DNA methylation, or other proteins — NOT CTSG\n- Papers 4, 5, 17, 53: About CG-NAP (centrosomal protein, also known as AKAP9/AKAP450) — NOT CTSG\n- Papers 7, 16, 20, 21, 29, 47, 65, 76-78, 89, 96, 100: About LH/CG receptor — NOT CTSG\n- Paper 25: About CTSG (cathepsin G) — CTSG! Describes NSP-catalyzed histone H3 cleavage\n- Paper 49: About CTSG in colorectal cancer — CTSG!\n- Paper 58: Bioinformatics/biomarker study — exclude (no mechanistic experiment)\n- Paper 79: About Ctsg regulatory elements and PML-RARA — mentions CTSG expression pattern\n- Paper 83: About gene body methylation regulating CTSG via lncRNA — this is about the lncRNA/epigenetic regulation of CTSG, not the CTSG protein mechanism itself; the product studied is AL136018.1 (lncRNA), not CTSG protein mechanism\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2021,\n      \"finding\": \"Cathepsin G (CTSG), along with neutrophil elastase (ELANE) and proteinase 3 (PRTN3), catalyzes proteolytic cleavage of the histone H3 amino terminus (H3ΔN) in human peripheral blood monocytes. This histone mark is abundant in monocytes and becomes largely undetectable upon differentiation into macrophages, correlating with NSP repression. Simultaneous depletion of all three NSPs in monocytic cells caused H3ΔN loss and increased chromatin accessibility, implicating CTSG-mediated H3 cleavage as an epigenetic mechanism that primes chromatin during monocyte-to-macrophage differentiation.\",\n      \"method\": \"Integrative epigenomic analysis, NSP depletion (loss-of-function), chromatin accessibility assays, and identification of H3ΔN as a substrate of CTSG/ELANE/PRTN3 in primary monocytes and monocytic cell lines\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional validation with simultaneous NSP depletion, integrative epigenomic analysis, and defined cellular phenotype (H3ΔN loss, increased chromatin accessibility) with multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"34017121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CTSG overexpression suppressed colorectal cancer (CRC) cell proliferation and tumor growth in vitro and in vivo, acting via suppression of Akt/mTOR signaling and elevation of apoptotic markers including Bcl2 downregulation. Pharmacological inhibition of Akt (MK2206) abolished the pro-survival effects of CTSG silencing, placing CTSG upstream of the Akt/mTOR/Bcl2 anti-apoptotic axis.\",\n      \"method\": \"Gain- and loss-of-function experiments (CTSG overexpression and knockdown) in CRC cell lines and xenograft models; Akt inhibitor (MK2206) epistasis; Western blot for pathway markers\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo loss/gain-of-function with epistasis experiment (MK2206 rescue), single lab, multiple orthogonal readouts\",\n      \"pmids\": [\"37151875\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"CTSG regulatory elements drive expression of PML-RARA not only in promyelocytes but also in hematopoietic stem/progenitor cells (KLS: Kit+Lin−Sca+) in Ctsg-PML-RARA transgenic mice. Endogenous Ctsg is expressed in KLS cells, and PML-RARA targeted to the Ctsg locus exerts biological effects on multi-lineage competitive repopulation and alters the transcriptional signature of early myeloid progenitors (CMPs and GMPs), demonstrating that CTSG is expressed and functionally active in multipotent progenitors, not solely in promyelocytes.\",\n      \"method\": \"Transgenic mouse model (Ctsg-PML-RARA knockin), purified HSPC and progenitor cell analysis, competitive repopulation assays, transcriptome analysis of sorted myeloid progenitors\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vivo genetic model with FACS-sorted cell populations and functional readout, single lab, defines CTSG expression domain in hematopoietic hierarchy\",\n      \"pmids\": [\"23056333\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Cathepsin G (CTSG) is a neutrophil serine protease expressed in myeloid cells (including hematopoietic progenitors and monocytes) that catalyzes proteolytic cleavage of the histone H3 amino terminus (H3ΔN) in monocytes—a chromatin-priming mark that is repressed during monocyte-to-macrophage differentiation—and that acts as a tumor suppressor in colorectal cancer by suppressing the Akt/mTOR/Bcl2 anti-apoptotic signaling axis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Cathepsin G (CTSG) is a myeloid serine protease whose proteolytic activity has been linked to chromatin remodeling during monocyte differentiation and to tumor-suppressive signaling [#0, #1]. Together with neutrophil elastase (ELANE) and proteinase 3 (PRTN3), CTSG cleaves the histone H3 amino terminus (H3\\u0394N) in primary human monocytes; this mark is abundant in monocytes and lost upon macrophage differentiation, and simultaneous depletion of the three proteases abolishes H3\\u0394N and increases chromatin accessibility, implicating CTSG-mediated H3 cleavage as an epigenetic priming mechanism in the monocyte-to-macrophage transition [#0]. CTSG expression is not confined to mature myeloid cells: its regulatory elements are active in hematopoietic stem/progenitor cells, and endogenous Ctsg is functionally expressed across early myeloid progenitors [#2]. In colorectal cancer, CTSG acts as a tumor suppressor, restraining proliferation and tumor growth by suppressing the Akt/mTOR/Bcl2 anti-apoptotic axis, with Akt inhibition epistatically abolishing the pro-survival effects of CTSG loss [#1].\",\n  \"teleology\": [\n    {\n      \"year\": 2012,\n      \"claim\": \"Defining where in the hematopoietic hierarchy CTSG is expressed established that it is active not only in promyelocytes but in multipotent progenitors, refining its expression domain and the cellular context of its activity.\",\n      \"evidence\": \"Ctsg-PML-RARA transgenic knockin mice, FACS-sorted HSPC/progenitor analysis, competitive repopulation and progenitor transcriptome profiling\",\n      \"pmids\": [\"23056333\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Does not characterize a proteolytic substrate or molecular function of CTSG in progenitors\",\n        \"Effects observed via PML-RARA expression driven by CTSG elements, not via CTSG protein activity itself\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identification of histone H3 N-terminal cleavage (H3\\u0394N) as a CTSG/ELANE/PRTN3-catalyzed mark answered whether these proteases have a nuclear, chromatin-directed role, establishing CTSG as an epigenetic effector that primes chromatin during monocyte-to-macrophage differentiation.\",\n      \"evidence\": \"Integrative epigenomics, simultaneous NSP depletion (loss-of-function), and chromatin accessibility assays in primary monocytes and monocytic cell lines\",\n      \"pmids\": [\"34017121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Relative contribution of CTSG versus ELANE and PRTN3 to H3 cleavage not individually resolved\",\n        \"How a granule-associated protease accesses nuclear chromatin is not addressed\",\n        \"Downstream transcriptional consequences of H3\\u0394N priming not fully mapped\"\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Gain- and loss-of-function in colorectal cancer placed CTSG upstream of the Akt/mTOR/Bcl2 axis, establishing a tumor-suppressive role distinct from its myeloid functions.\",\n      \"evidence\": \"CTSG overexpression and knockdown in CRC cell lines and xenografts, MK2206 (Akt inhibitor) epistasis, and Western blot of pathway markers\",\n      \"pmids\": [\"37151875\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Whether CTSG protease activity or a non-catalytic function drives Akt suppression is unresolved\",\n        \"Direct molecular target linking CTSG to Akt/mTOR not identified\",\n        \"Single-lab finding without independent replication\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How CTSG proteolytic activity is mechanistically connected to its distinct roles in chromatin priming and Akt/mTOR suppression, and what its direct substrates are in each context, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No unifying substrate or mechanism linking myeloid chromatin and CRC signaling roles\",\n        \"Mechanism of nuclear access and substrate specificity uncharacterized\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-4839726\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":4,"faith_pct":100.0}}