{"gene":"CSF3R","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":2013,"finding":"Oncogenic CSF3R mutations segregate into two distinct regions (membrane-proximal and truncation) and lead to preferential downstream signaling through SRC family-TNK2 or JAK kinases, respectively, conferring differential sensitivity to kinase inhibitors. Validated by in vitro transformation assays and primary-cell colony drug sensitivity assays.","method":"In vitro transformation assay, siRNA kinase screen, small-molecule inhibitor panel, primary-cell colony assay","journal":"The New England journal of medicine","confidence":"High","confidence_rationale":"Tier 1-2 — multiple orthogonal methods, replicated across patient samples and functional assays","pmids":["23656643"],"is_preprint":false},{"year":1999,"finding":"Truncating mutations of G-CSFR found in SCN/AML patients delete a critical internalization domain, resulting in impaired ligand internalization, defective receptor downmodulation, and enhanced growth signaling, explaining the dominant-negative, G-CSF-hypersensitive phenotype.","method":"Functional internalization assay, ligand binding assay, growth signaling assay in transfected cells","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1-2 — direct functional dissection of internalization domain with mechanistic readouts","pmids":["9885205"],"is_preprint":false},{"year":2014,"finding":"The CSF3R T618I membrane-proximal mutation causes ligand-independent signaling by preventing O-linked glycosylation at residues Thr-615 and Thr-618, which increases receptor dimerization. Truncation mutations instead induce overexpression and ligand hypersensitivity by removing endocytosis/degradation motifs. Combined membrane-proximal + truncation mutations show enhanced cellular transformation compared to either alone.","method":"Glycosylation assay, receptor dimerization assay, transformation assay in Ba/F3 cells, mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — biochemical reconstitution with mutagenesis and multiple orthogonal readouts in single study","pmids":["24403076"],"is_preprint":false},{"year":2013,"finding":"CSF3R T618I is sufficient to drive a lethal myeloproliferative disorder in a murine bone marrow transplantation model, characterized by granulocyte overproduction and granulocytic infiltration, and this disorder is responsive to JAK1/2 inhibition with ruxolitinib.","method":"Murine bone marrow transplantation model, pharmacological JAK inhibition (ruxolitinib)","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 — in vivo genetic model with pharmacological validation","pmids":["24081659"],"is_preprint":false},{"year":2008,"finding":"Expression of truncated mutant Csf3r in mice confers a strong clonal advantage at the HSC level dependent on exogenous G-CSF. G-CSF-induced proliferation and Stat5 phosphorylation are increased in mutant HSCs, and the proliferative advantage is abrogated in myeloid progenitors lacking both Stat5A and Stat5B, demonstrating that inappropriate Stat5 activation is key to clonal dominance.","method":"Mouse genetic model, HSC isolation, phospho-Stat5 assay, Stat5A/B double knockout epistasis","journal":"The Journal of clinical investigation","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with double KO, replicated in multiple assays","pmids":["18292815"],"is_preprint":false},{"year":2009,"finding":"A T617N missense mutation in the CSF3R transmembrane domain energetically favors dimerization, driving constitutive receptor activation and G-CSF hypersensitivity for proliferation and differentiation, causing hereditary chronic neutrophilia. Demonstrated by transmembrane domain dimerization analysis and xenotransplantation assays.","method":"Transmembrane domain dimerization assay, xenotransplantation, syngeneic bone marrow engraftment","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1-2 — biochemical dimerization assay plus in vivo functional models","pmids":["19620628"],"is_preprint":false},{"year":2008,"finding":"The ubiquitin/proteasome system is required for G-CSFR internalization and degradation. G-CSFR is constitutively ubiquitinated (increasing after ligand binding), and disruption of ubiquitination at lysine 762 (K762R mutant) impairs ligand-induced internalization, enhances Stat5 and Akt activation, and induces hyperproliferative G-CSF responses similar to SCN/AML truncation mutants.","method":"Temperature-sensitive E1 ubiquitin enzyme cell line (ts20), K762R mutagenesis, proteasome inhibitor MG132, flow cytometry, signaling assays","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1-2 — mutagenesis plus pharmacological and genetic dissection of ubiquitin pathway","pmids":["18923646"],"is_preprint":false},{"year":2013,"finding":"The E3 ubiquitin ligase Fbw7 (a component of SCF complex) physically associates with G-CSFR and promotes its ubiquitin-mediated proteasomal degradation, reducing STAT3 phosphorylation and inhibiting G-CSF-dependent granulocytic differentiation. GSK3β co-operates with Fbw7 and both are required interdependently for G-CSFR degradation.","method":"Co-immunoprecipitation, ubiquitination assay, knockdown, STAT3 phosphorylation assay, granulocytic differentiation assay","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP and functional knockdown, single lab","pmids":["23820376"],"is_preprint":false},{"year":2008,"finding":"The E3 ubiquitin ligase Fbw7-independent role of the proteasome in G-CSFR regulation: in primary human neutrophils, proteasome inhibition (but not lysosome inhibition) blocks ligand-induced G-CSFR internalization/degradation, contrasting with lysosomal routing in transfected cell lines, demonstrating cell-type-specific post-endocytic routing.","method":"ts20 cell line with temperature-sensitive E1 enzyme, chloroquine and MG132 inhibitors, primary neutrophil assay, flow cytometry","journal":"Cytokine","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological dissection in primary cells and genetic cell line","pmids":["18554923"],"is_preprint":false},{"year":2017,"finding":"E6AP (E3 ubiquitin ligase) physically associates with G-CSFR, targets it for ubiquitin-mediated proteasomal degradation, reduces STAT3 phosphorylation, and inhibits granulocytic differentiation. E6AP knockdown restores G-CSFR signaling and enhances differentiation. The truncation mutant G-CSFR-T718 is also degraded by E6AP but at a slower rate.","method":"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, STAT3 phosphorylation assay, differentiation assay","journal":"Biochimica et biophysica acta. Molecular cell research","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP with functional validation, single lab","pmids":["28578910"],"is_preprint":false},{"year":2018,"finding":"Novel gain-of-function CSF3R mutations transform cells via four distinct mechanisms: (1) cysteine-mediated disulfide bond dimerization (S581C); (2) polar amino acid substitution at transmembrane dimer interface (Thr-640); (3) increased internalization mimicking low G-CSF dose (Glu-524 substitution); (4) hydrophobic substitutions at membrane-proximal O-glycosylation residues (Thr-612, Thr-615, Thr-618). STAT3 and ERK activation require CSF3R internalization, whereas STAT5 activation occurs at the cell surface.","method":"Cellular transformation assay in Ba/F3 cells, sequencing, receptor localization studies, signaling assays","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 — functional transformation screen with mechanistic follow-up for multiple mutation classes","pmids":["29572350"],"is_preprint":false},{"year":2016,"finding":"CSF3R proximal mutations (but not truncation mutations alone) are sufficient to induce leukemia in mice. Both proximal and compound (proximal+truncation) mutations require enhanced MAPK signaling through upregulation of the Ksr1 adaptor protein. MEK1/2 inhibition with trametinib suppresses leukemia from both CSF3R proximal and ruxolitinib-resistant compound mutations.","method":"Mouse bone marrow transplantation, whole-genome expression profiling, biochemical experiments, pharmacological MEK inhibition","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 1-2 — in vivo genetic model with transcriptomic and pharmacological validation","pmids":["28031554"],"is_preprint":false},{"year":2017,"finding":"CSF3R distal cytoplasmic truncation mutations (Q793-Q823) have leukemogenic potential via markedly decreased receptor degradation due to loss of a de-phosphorylation domain (residues N818-F836). Truncations prior to Q823 increase expression of a higher-molecular-weight (glycosylated) receptor band essential for surface expression and oncogenic potential. Sufficient STAT5 activation is required for oncogenic transformation.","method":"Transformation assay in Ba/F3 cells, receptor degradation assay, mutagenesis, surface expression analysis, STAT5 signaling assay","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 — multiple functional assays with mutagenesis, single lab","pmids":["28439110"],"is_preprint":false},{"year":1995,"finding":"A point mutation in the G-CSFR gene creating an altered splice donor site leads to overexpression of an SD isoform that lacks the distal C-terminal region (essential for maturation signaling) but retains the membrane-proximal region. The SD isoform has high affinity for G-CSF but cannot transduce growth signals in BAF3 cells and scarcely activates JAK2 kinase.","method":"Molecular cloning, BAF3 growth assay, JAK2 kinase activation assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1-2 — functional assay with kinase activation measurement, identifies domain-function relationship","pmids":["7531515"],"is_preprint":false},{"year":2017,"finding":"Disruption of conserved extracellular cysteine pairs in CSF3R leads to either gain- or loss-of-function. The activating W341C mutation in the fibronectin-like type III extracellular domain transforms cells via cysteine-mediated intermolecular disulfide bonds causing receptor dimerization, and primary samples carrying this mutation are sensitive to JAK inhibitors.","method":"Transformation assay in Ba/F3 cells, cysteine mutagenesis, dimerization assay, patient sample drug sensitivity","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 — functional transformation with biochemical dimerization evidence, single lab","pmids":["28652245"],"is_preprint":false},{"year":2018,"finding":"N610 residue of CSF3R is an N-linked glycosylation site (confirmed by mass spectrometry) and primary site of receptor sialylation. Substitution mutations at N610 prevent membrane-proximal N-glycosylation, drive ligand-independent cellular expansion, and activate JAK-STAT signaling, demonstrating that membrane-proximal N-glycosylation maintains ligand dependence of CSF3R.","method":"Mass spectrometry glycosylation analysis, Ba/F3 transformation assay, mutagenesis, JAK-STAT signaling assay","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 — mass spectrometry glycosylation mapping with functional mutagenesis validation","pmids":["30348809"],"is_preprint":false},{"year":2019,"finding":"The T618I CSF3R is O-glycosylated but undergoes enhanced spontaneous internalization and degradation. Proteasome inhibition dramatically increases its surface expression. The O-glycosylated T618I receptor is constitutively tyrosine phosphorylated (unlike WT which requires ligand), correlating with constitutive JAK2 activation, and both mutant receptor and JAK2 are constitutively ubiquitinated.","method":"Glycosylation assay, internalization assay, proteasome inhibition, tyrosine phosphorylation assay, JAK2 activation assay, ubiquitination assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 — multiple biochemical assays, single lab","pmids":["31848046"],"is_preprint":false},{"year":2010,"finding":"Neutrophil elastase (NE) proteolytically cleaves G-CSFR at its amino-terminus on human PMN in a time-dependent manner, leading to decreased G-CSFR surface expression and appearance of cleavage fragments, and inhibits G-CSFR-mediated granulopoiesis (CFU-GM formation), establishing a novel negative feedback loop for granulopoiesis regulation.","method":"Flow cytometry, western blot of cleavage products, CFU-GM colony assay with primary human bone marrow cells","journal":"Journal of inflammation (London, England)","confidence":"Medium","confidence_rationale":"Tier 2 — direct biochemical cleavage assay with functional granulopoiesis readout","pmids":["20205821"],"is_preprint":false},{"year":2023,"finding":"ALKBH5 (m6A RNA demethylase) directly binds CSF3R mRNA (confirmed by RIP-qPCR) and erases m6A methylation on CSF3R mRNA, increasing mRNA stability and CSF3R protein expression, which upregulates cell surface G-CSFR and downstream STAT3 signaling to drive emergency granulopoiesis and neutrophil mobilization.","method":"RIP-qPCR, m6A methylation assay, mRNA stability assay, ALKBH5 KO mouse model, STAT3 signaling assay","journal":"Cellular & molecular immunology","confidence":"High","confidence_rationale":"Tier 2 — direct RNA binding confirmed by RIP-qPCR with in vivo KO validation and mechanistic readouts","pmids":["38114747"],"is_preprint":false},{"year":2019,"finding":"Activating CSF3R mutations cooperate with loss-of-function CEBPA mutations to promote AML development at the level of myeloid lineage enhancers, where mutant CEBPA prevents activation of differentiation-associated enhancers. CEBPA mutations must occur as the initial event for leukemia initiation in this cooperative pathway.","method":"Mouse genetic models, enhancer chromatin profiling, epistasis testing of mutation order","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — genetic epistasis with epigenomic mechanistic validation in vivo","pmids":["31784538"],"is_preprint":false},{"year":2014,"finding":"Functional studies demonstrated that co-expression of mutated RUNX1 and mutated CSF3R in hematopoietic CD34+ cells leads to elevated G-CSF-induced proliferation with diminished myeloid differentiation. Single-cell analyses confirmed RUNX1 and CSF3R mutations reside in the same malignant clone.","method":"CD34+ cell functional assay, single-cell analysis, deep sequencing","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2-3 — functional cell assay with single-cell clonality confirmation","pmids":["24523240"],"is_preprint":false},{"year":2014,"finding":"Recessively inherited loss-of-function CSF3R mutations cause severe congenital neutropenia through distinct mechanisms: a homozygous missense mutation (R308C) causes perturbed N-glycosylation and aberrant cell surface localization; compound heterozygous frameshifts cause premature stop codons. Patients have full bone marrow myeloid maturation but do not respond to recombinant G-CSF, establishing functional importance of G-CSFR signaling for peripheral neutrophil numbers.","method":"Glycosylation assay, cell surface expression analysis, clinical G-CSF non-response, genetic sequencing","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2-3 — biochemical characterization combined with clinical functional validation","pmids":["24753537"],"is_preprint":false},{"year":2004,"finding":"G-CSF receptor knockout mice demonstrate that G-CSFR-mediated clearance is a major mechanism for plasma clearance of both filgrastim and pegfilgrastim; absence of functional G-CSFR significantly increases AUC, prolongs MRT and half-life, and reduces clearance of both forms of G-CSF.","method":"G-CSFR knockout mouse pharmacokinetic study, ELISA-based plasma measurement","journal":"Pharmacological research","confidence":"High","confidence_rationale":"Tier 2 — genetic KO model with rigorous PK analysis","pmids":["15082029"],"is_preprint":false},{"year":2011,"finding":"Truncated G-CSFR cooperates with the PML-RARα oncogene to accelerate AML development in mice in a G-CSF-dependent fashion, establishing a causal contribution of CSF3R truncation mutations to leukemic transformation when combined with a second oncogenic hit.","method":"Mouse bone marrow transplantation with PML-RARα + truncated Csf3r co-expression, G-CSF dependence assay","journal":"Experimental hematology","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo genetic cooperation model with G-CSF dependence validation","pmids":["21911095"],"is_preprint":false},{"year":2017,"finding":"A truncated G-CSFR (d715) found in SCN patients inhibits G-CSF-induced NE expression in a dominant-negative manner and suppresses unfolded protein response and apoptosis induced by SCN-derived NE mutants, associated with sustained AKT and STAT5 activation and augmented BCL-XL expression, providing a mechanism for how CSF3R truncation mutations protect myeloid precursors from NE-mutant-induced apoptosis.","method":"Dominant-negative functional assay, UPR assay, apoptosis assay, AKT/STAT5 phosphorylation, BCL-XL expression","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — multiple biochemical readouts in cell-based assays, single lab","pmids":["28073911"],"is_preprint":false},{"year":2019,"finding":"SRSF2 mutations alter CSF3R mRNA splicing, increasing the ratio of splice variant V3 (which confers a hypoproliferative phenotype with defective JAK-STAT activation when expressed alone) relative to V1 (wild-type). SRSF2 knockout in KG-1 and normal CD34+ cells decreased the V3/V1 ratio, establishing SRSF2 as a regulator of CSF3R splicing.","method":"Digital PCR splice variant quantitation, functional proliferation assay, JAK-STAT activation assay, SRSF2 knockout","journal":"Leukemia","confidence":"Medium","confidence_rationale":"Tier 2 — functional splicing assay with genetic validation, single lab","pmids":["31462738"],"is_preprint":false},{"year":2022,"finding":"SRSF2 P95H mutations promote Class IV CSF3R splicing by binding to exonic splicing enhancer (ESE) sequences in CSF3R exon 17 (confirmed by in vitro splicing assay with CSF3R minigene). Class IV isoform add-back in Csf3r-null mouse progenitors increased granulocyte progenitors with impaired neutrophil differentiation, while Class III produced dysmorphic neutrophils, demonstrating functional consequences of altered CSF3R splicing on granulopoiesis.","method":"In vitro splicing assay with CSF3R minigene, ESE deletion mutagenesis, Csf3r-null mouse progenitor add-back, differentiation assay","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro splicing reconstitution with mutagenesis and in vivo add-back functional validation","pmids":["35941213"],"is_preprint":false},{"year":2008,"finding":"LRG-mediated acceleration of G-CSF-driven neutrophil differentiation and CD11b expression correlates with increased phospho-STAT3 but not PU.1 or p27(kip1). This effect requires the transmembrane and cytoplasmic domains of G-CSFR (shown using chimeric EpoR/G-CSFR), identifying a distinct non-redundant G-CSFR signaling pathway for LRG function.","method":"Chimeric EpoR/G-CSFR transfection, stable LRG transfection in 32Dcl3 cells, phospho-STAT3 assay, differentiation assay","journal":"Journal of leukocyte biology","confidence":"Medium","confidence_rationale":"Tier 2 — chimeric receptor dissection with functional differentiation readout","pmids":["18272588"],"is_preprint":false},{"year":2023,"finding":"Activating mutations in CSF3R are enriched at residues normally occupied by N, T, and S (glycosylated amino acids), confirmed by mass spectrometry detection of GalNAc and Gal-GalNAc O-glycans at WT threonine 618. Domain mapping showed the single domain containing residue 618 is sufficient for ligand-independent activity, pointing to glycosylation of hotspot residues as a key regulatory mechanism for CSF3R ligand dependence.","method":"Unbiased mutational screen, domain mapping, mass spectrometry glycan identification","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 — mass spectrometry-based glycan identification combined with functional domain mapping and mutational screen","pmids":["37116708"],"is_preprint":false},{"year":2000,"finding":"G-CSF infusion in humans dose-independently downregulates its own receptor (CD114) by 75% on neutrophils and induces neutrophil degranulation (CD11b increase >300%), leading to up to 10-fold increase in plasma gelatinase B (MMP-9), which may contribute to neutrophil/stem cell mobilization.","method":"Randomized controlled crossover study in healthy volunteers, flow cytometry for CD114 and CD11b, plasma MMP-9 ELISA","journal":"British journal of haematology","confidence":"Medium","confidence_rationale":"Tier 2 — direct in vivo human experiment with quantitative receptor and functional readouts","pmids":["11091218"],"is_preprint":false},{"year":1991,"finding":"The CSF3R gene was localized to chromosome 1p35-p34.3 by in situ hybridization and PCR-based somatic cell hybrid analysis.","method":"In situ hybridization, PCR with somatic cell hybrids, spot-blot hybridization of sorted chromosomes","journal":"Genomics","confidence":"High","confidence_rationale":"Tier 2 — multiple independent mapping methods in single study","pmids":["1833306"],"is_preprint":false},{"year":2023,"finding":"CSF3R T618I cooperates with RUNX1-RUNX1T1 fusion to expand hematopoietic progenitors and increase self-renewal in CD34+ cells, with gene expression profiling revealing upregulation of hedgehog signaling/GLI2 as the cooperative mechanism. Both primary hematopoietic cells and SKNO-1 cells expressing CSF3R T618I show increased sensitivity to the GLI inhibitor GANT61.","method":"CD34+ cell transduction, gene expression profiling, pharmacological GLI inhibition in primary cells and cell line","journal":"HemaSphere","confidence":"Medium","confidence_rationale":"Tier 2 — transcriptomic pathway identification with functional pharmacological validation","pmids":["37841755"],"is_preprint":false}],"current_model":"CSF3R (G-CSFR) is a cytokine receptor that normally requires G-CSF ligand binding for activation, with receptor dimerization, JAK2 activation, and downstream STAT3/STAT5/ERK signaling driving granulopoiesis; ligand dependence is maintained by membrane-proximal O- and N-glycosylation that prevents constitutive dimerization, and activated receptor is regulated by ubiquitination at K762 (by E3 ligases Fbw7 and E6AP) targeting it for proteasomal/lysosomal degradation. Oncogenic mutations fall into two mechanistically distinct classes: membrane-proximal mutations (e.g., T618I) abolish O-glycosylation causing constitutive ligand-independent dimerization and JAK-STAT signaling, while cytoplasmic truncation mutations remove internalization/degradation motifs causing receptor overexpression, ligand hypersensitivity, and enhanced STAT5 activation; both classes can cooperate with co-mutations in CEBPA, RUNX1, or SETBP1 to drive AML or chronic neutrophilic leukemia."},"narrative":{"teleology":[{"year":1991,"claim":"Establishing the chromosomal location of CSF3R at 1p35-p34.3 provided the foundational genetic mapping needed for subsequent mutation and linkage studies.","evidence":"In situ hybridization and PCR-based somatic cell hybrid analysis","pmids":["1833306"],"confidence":"High","gaps":["No functional characterization of the locus","Regulatory elements not mapped"]},{"year":1995,"claim":"Identification of a splice variant lacking the distal C-terminus revealed that the cytoplasmic domain is essential for JAK2 activation and growth signaling, establishing the first domain-function map of G-CSFR.","evidence":"Molecular cloning with BAF3 growth assay and JAK2 kinase activation measurement","pmids":["7531515"],"confidence":"High","gaps":["Specific cytoplasmic residues required for JAK2 coupling not identified","Downstream signaling cascade not yet delineated"]},{"year":1999,"claim":"Demonstrating that SCN/AML-associated truncation mutations delete a critical internalization domain explained how these mutations cause G-CSF hypersensitivity through defective receptor downmodulation rather than constitutive activation.","evidence":"Functional internalization, ligand binding, and growth signaling assays in transfected cells","pmids":["9885205"],"confidence":"High","gaps":["Molecular identity of the internalization motif not mapped to specific residues","Ubiquitin-dependent vs. ubiquitin-independent internalization not distinguished"]},{"year":2004,"claim":"G-CSFR knockout mouse pharmacokinetic studies established that receptor-mediated endocytosis is a major pathway for plasma clearance of G-CSF ligand, revealing a receptor-level feedback loop controlling systemic G-CSF availability.","evidence":"G-CSFR knockout mouse with ELISA-based pharmacokinetic analysis of filgrastim and pegfilgrastim","pmids":["15082029"],"confidence":"High","gaps":["Relative contribution of renal vs. receptor-mediated clearance not fully quantified","Tissue-specific receptor recycling not addressed"]},{"year":2008,"claim":"Three contemporaneous studies established the ubiquitin-proteasome system as central to G-CSFR turnover: K762 was identified as the key ubiquitination site controlling internalization and signaling attenuation, truncation mutant mice revealed STAT5 as the essential downstream effector of clonal dominance, and cell-type-specific routing to proteasomal vs. lysosomal degradation was demonstrated.","evidence":"K762R mutagenesis with temperature-sensitive E1 cell line and proteasome inhibitors; Stat5A/B double-knockout epistasis in mouse HSCs; primary neutrophil proteasome/lysosome inhibitor comparison","pmids":["18923646","18292815","18554923"],"confidence":"High","gaps":["E3 ligase(s) responsible for K762 ubiquitination not yet identified at this time","Whether STAT5 dependence applies to proximal mutations unknown","Structural basis of cell-type-specific routing unexplained"]},{"year":2009,"claim":"The T617N transmembrane mutation demonstrated that energetically favorable dimerization of the transmembrane domain is sufficient for constitutive receptor activation, establishing a second mechanism (distinct from glycosylation loss) for ligand-independent signaling and explaining hereditary chronic neutrophilia.","evidence":"Transmembrane domain dimerization assay with xenotransplantation and syngeneic bone marrow engraftment","pmids":["19620628"],"confidence":"High","gaps":["Structural resolution of transmembrane dimer interface lacking","Whether downstream pathway usage differs from extracellular-domain activating mutations not tested"]},{"year":2010,"claim":"Neutrophil elastase was shown to proteolytically cleave the G-CSFR ectodomain, reducing surface expression and inhibiting granulopoiesis, establishing a neutrophil-intrinsic negative feedback loop distinct from internalization-based downregulation.","evidence":"Flow cytometry and western blot of cleavage products with CFU-GM colony assay on primary human bone marrow cells","pmids":["20205821"],"confidence":"Medium","gaps":["Cleavage site not mapped to a specific residue","In vivo relevance not confirmed in genetic models","Whether cleavage product retains signaling capacity unknown"]},{"year":2013,"claim":"Concurrent studies classified oncogenic CSF3R mutations into membrane-proximal (JAK-pathway-dependent, ruxolitinib-sensitive) and truncation (SRC/TNK2-dependent, dasatinib-sensitive) classes, while the E3 ligase Fbw7 was identified as a GSK3β-dependent mediator of G-CSFR proteasomal degradation controlling STAT3 signaling.","evidence":"In vitro transformation with kinase inhibitor panels and primary patient cells; murine BMT model with ruxolitinib; co-IP and ubiquitination assays with Fbw7/GSK3β","pmids":["23656643","24081659","23820376"],"confidence":"High","gaps":["Fbw7-G-CSFR interaction confirmed only in one lab","Whether SRC/TNK2 dependence of truncation mutants holds in vivo unclear","Clinical validation of dual inhibitor strategy pending"]},{"year":2014,"claim":"The T618I mutation was shown to prevent O-glycosylation at Thr-615/618, directly causing ligand-independent dimerization, while compound proximal+truncation mutations showed cooperative transformation — and separately, recessive CSF3R loss-of-function mutations were shown to cause severe congenital neutropenia through disrupted glycosylation and surface trafficking.","evidence":"Glycosylation and dimerization assays in Ba/F3 cells with mutagenesis; patient R308C glycosylation and surface expression analysis; RUNX1-CSF3R co-expression in CD34+ cells","pmids":["24403076","24753537","24523240"],"confidence":"High","gaps":["Structural basis of how O-glycan loss permits dimerization unknown","Whether R308C neutropenia is fully rescued by downstream pathway activation untested"]},{"year":2016,"claim":"In vivo modeling revealed that proximal CSF3R mutations are sufficient for leukemogenesis and require MAPK signaling via the Ksr1 adaptor, with MEK inhibition (trametinib) effective against both proximal and ruxolitinib-resistant compound mutations, identifying an alternative therapeutic vulnerability.","evidence":"Mouse BMT model with whole-genome expression profiling and pharmacological MEK1/2 inhibition","pmids":["28031554"],"confidence":"High","gaps":["Ksr1 mechanism of upregulation by CSF3R mutations not defined","Whether MEK inhibition is effective in human CNL not established"]},{"year":2017,"claim":"Multiple studies expanded the mechanistic repertoire: E6AP was identified as a second E3 ligase targeting G-CSFR for degradation; the W341C extracellular mutation was shown to activate via intermolecular disulfide-bonded dimerization; distal truncation mutations (Q793-Q823) were mapped to loss of a dephosphorylation domain; and truncated G-CSFR was shown to protect against NE-mutant-induced apoptosis via sustained AKT/STAT5/BCL-XL.","evidence":"Co-IP/ubiquitination assays for E6AP; cysteine mutagenesis/dimerization for W341C; degradation/mutagenesis assays for distal truncations; dominant-negative/UPR/apoptosis assays for NE interaction","pmids":["28578910","28652245","28439110","28073911"],"confidence":"Medium","gaps":["E6AP and Fbw7 substrate specificity overlap not resolved","Whether W341C and T618I mutations use identical downstream pathways untested","Dephosphorylation domain phosphatase identity unknown"]},{"year":2018,"claim":"A comprehensive transformation screen defined four distinct gain-of-function mechanisms (disulfide dimerization, transmembrane polar substitution, enhanced internalization, O-glycosylation loss) and demonstrated that STAT3/ERK activation requires receptor internalization while STAT5 is activated at the cell surface, along with discovery that N-glycosylation at N610 is a critical gatekeeper of ligand dependence.","evidence":"Ba/F3 transformation screen with receptor localization and signaling compartmentalization studies; mass spectrometry N-glycan mapping at N610 with mutagenesis","pmids":["29572350","30348809"],"confidence":"High","gaps":["Endosomal signaling complex composition uncharacterized","How internalized receptor specifically activates STAT3 but not STAT5 mechanistically unexplained"]},{"year":2019,"claim":"Cooperating genetic events were mechanistically resolved: CEBPA loss-of-function must precede CSF3R activation for AML through failure to activate differentiation enhancers, and SRSF2 mutations were shown to alter CSF3R mRNA splicing (increasing the V3 isoform) with functional consequences for JAK-STAT signaling.","evidence":"Mouse genetic epistasis with enhancer chromatin profiling for CEBPA; digital PCR splice variant quantitation with SRSF2 KO for splicing","pmids":["31784538","31462738"],"confidence":"High","gaps":["Whether CEBPA mutation order requirement applies to other CSF3R cooperating mutations unknown","Functional consequence of V3 isoform increase in vivo not established"]},{"year":2022,"claim":"SRSF2 P95H was shown to directly bind exonic splicing enhancer sequences in CSF3R exon 17, promoting Class IV splicing that expands granulocyte progenitors while impairing differentiation, providing a direct RNA-level mechanism linking spliceosome mutations to aberrant G-CSFR signaling.","evidence":"In vitro splicing assay with CSF3R minigene, ESE deletion mutagenesis, Csf3r-null mouse progenitor add-back","pmids":["35941213"],"confidence":"High","gaps":["Whether other spliceosome mutations (U2AF1, SF3B1) similarly alter CSF3R splicing untested","Structural basis of SRSF2 P95H recognition of CSF3R ESE not resolved"]},{"year":2023,"claim":"Three advances converged: mass spectrometry confirmed O-glycans (GalNAc, Gal-GalNAc) at T618 as the glycosylation event preventing constitutive activation; ALKBH5-mediated m6A demethylation of CSF3R mRNA was identified as a post-transcriptional activator of emergency granulopoiesis; and CSF3R T618I was shown to cooperate with RUNX1-RUNX1T1 via hedgehog/GLI2 upregulation.","evidence":"Mass spectrometry glycan identification with unbiased mutational screen; RIP-qPCR and ALKBH5 KO mouse model; CD34+ transduction with GLI inhibitor pharmacology","pmids":["37116708","38114747","37841755"],"confidence":"High","gaps":["Glycosyltransferase(s) responsible for T618 O-glycosylation not identified","Whether ALKBH5-CSF3R axis operates in leukemic cells unknown","GLI2 cooperation mechanism not validated in vivo leukemia models"]},{"year":null,"claim":"Key unresolved questions include the structural basis of how glycosylation prevents receptor dimerization, the identity of glycosyltransferases modifying the membrane-proximal region, the full composition of endosomal signaling complexes that differentially activate STAT3/ERK vs. STAT5, and whether therapeutic targeting of specific CSF3R mutation classes can be translated to clinical outcomes.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of G-CSFR ectodomain with glycans","Glycosyltransferases for membrane-proximal O-glycosylation unidentified","Endosomal signaling complex composition unknown","Clinical trial data for mutation-class-specific inhibitor strategies lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,2,5,10,13]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,6,7,9]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[2,5,10,15,16,21,29]},{"term_id":"GO:0005768","term_label":"endosome","supporting_discovery_ids":[10,16]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[6,16]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,2,4,5,10,13,15]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[4,18,29]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[0,3,11,19,23]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[6,7,9,16]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[26,27]}],"complexes":[],"partners":["JAK2","STAT3","STAT5A","STAT5B","FBXW7","UBE3A","ALKBH5","SRSF2"],"other_free_text":[]},"mechanistic_narrative":"CSF3R encodes the granulocyte colony-stimulating factor receptor (G-CSFR), a type I cytokine receptor that transduces G-CSF signals through JAK2-STAT3/STAT5 and MAPK/ERK pathways to drive granulopoiesis, neutrophil mobilization, and hematopoietic progenitor proliferation [PMID:7531515, PMID:18292815, PMID:23656643]. Ligand dependence is enforced by membrane-proximal O- and N-glycosylation (at Thr-612/615/618 and Asn-610), which prevents constitutive receptor dimerization; mutations eliminating these glycosylation sites drive ligand-independent JAK-STAT signaling and cellular transformation [PMID:24403076, PMID:30348809, PMID:37116708]. Receptor homeostasis is maintained by ubiquitination at Lys-762 (mediated by E3 ligases Fbw7 and E6AP) targeting G-CSFR for proteasomal and lysosomal degradation, and truncation mutations that delete internalization/degradation motifs cause receptor overexpression, enhanced STAT5 activation, and clonal dominance of hematopoietic stem cells [PMID:9885205, PMID:18923646, PMID:18292815]. Recessive loss-of-function CSF3R mutations cause severe congenital neutropenia, while somatic gain-of-function mutations—particularly membrane-proximal (e.g., T618I) and cytoplasmic truncation classes that cooperate with co-mutations in CEBPA, RUNX1, or SETBP1—drive chronic neutrophilic leukemia and AML [PMID:24753537, PMID:23656643, PMID:31784538]."},"prefetch_data":{"uniprot":{"accession":"Q99062","full_name":"Granulocyte colony-stimulating factor receptor","aliases":[],"length_aa":836,"mass_kda":92.2,"function":"Receptor for granulocyte colony-stimulating factor (CSF3), essential for granulocytic maturation. Plays a crucial role in the proliferation, differentiation and survival of cells along the neutrophilic lineage. 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JAGN1","url":"https://www.omim.org/entry/616012"},{"mim_id":"610738","title":"NEUTROPENIA, SEVERE CONGENITAL, 3, AUTOSOMAL RECESSIVE; SCN3","url":"https://www.omim.org/entry/610738"},{"mim_id":"608764","title":"NICOTINAMIDE PHOSPHORIBOSYLTRANSFERASE; NAMPT","url":"https://www.omim.org/entry/608764"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"bone marrow","ntpm":183.7},{"tissue":"lung","ntpm":134.4},{"tissue":"lymphoid 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recurrence.","date":"2024","source":"American journal of cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/39005677","citation_count":5,"is_preprint":false},{"pmid":"29025591","id":"PMC_29025591","title":"Identification of a novel CSF3R-SPTAN1 fusion gene in an atypical chronic myeloid leukemia patient with t(1;9)(p34;q34) by RNA-Seq.","date":"2017","source":"Cancer genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29025591","citation_count":5,"is_preprint":false},{"pmid":"38739706","id":"PMC_38739706","title":"A JAGN1-associated severe congenital neutropenia zebrafish model revealed an altered G-CSFR signaling and UPR activation.","date":"2024","source":"Blood advances","url":"https://pubmed.ncbi.nlm.nih.gov/38739706","citation_count":5,"is_preprint":false},{"pmid":"24746896","id":"PMC_24746896","title":"Prevalence and impact of colony stimulating factor 3 receptor (CSF3R) mutations among Egyptian acute myeloid leukemia patients.","date":"2014","source":"Leukemia 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leukemia.","date":"2018","source":"Hematology (Amsterdam, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/29338593","citation_count":3,"is_preprint":false},{"pmid":"36982406","id":"PMC_36982406","title":"Identification of CD114 Membrane Receptors as a Molecular Target in Medulloblastomas.","date":"2023","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36982406","citation_count":2,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48929,"output_tokens":7480,"usd":0.129494},"stage2":{"model":"claude-opus-4-6","input_tokens":11198,"output_tokens":4335,"usd":0.246548},"total_usd":0.376042,"stage1_batch_id":"msgbatch_011kfMfE81o6CTcyhVUqumuW","stage2_batch_id":"msgbatch_01DTputS6WNkH745x1nVSoBo","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2013,\n      \"finding\": \"Oncogenic CSF3R mutations segregate into two distinct regions (membrane-proximal and truncation) and lead to preferential downstream signaling through SRC family-TNK2 or JAK kinases, respectively, conferring differential sensitivity to kinase inhibitors. Validated by in vitro transformation assays and primary-cell colony drug sensitivity assays.\",\n      \"method\": \"In vitro transformation assay, siRNA kinase screen, small-molecule inhibitor panel, primary-cell colony assay\",\n      \"journal\": \"The New England journal of medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — multiple orthogonal methods, replicated across patient samples and functional assays\",\n      \"pmids\": [\"23656643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Truncating mutations of G-CSFR found in SCN/AML patients delete a critical internalization domain, resulting in impaired ligand internalization, defective receptor downmodulation, and enhanced growth signaling, explaining the dominant-negative, G-CSF-hypersensitive phenotype.\",\n      \"method\": \"Functional internalization assay, ligand binding assay, growth signaling assay in transfected cells\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct functional dissection of internalization domain with mechanistic readouts\",\n      \"pmids\": [\"9885205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The CSF3R T618I membrane-proximal mutation causes ligand-independent signaling by preventing O-linked glycosylation at residues Thr-615 and Thr-618, which increases receptor dimerization. Truncation mutations instead induce overexpression and ligand hypersensitivity by removing endocytosis/degradation motifs. Combined membrane-proximal + truncation mutations show enhanced cellular transformation compared to either alone.\",\n      \"method\": \"Glycosylation assay, receptor dimerization assay, transformation assay in Ba/F3 cells, mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — biochemical reconstitution with mutagenesis and multiple orthogonal readouts in single study\",\n      \"pmids\": [\"24403076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CSF3R T618I is sufficient to drive a lethal myeloproliferative disorder in a murine bone marrow transplantation model, characterized by granulocyte overproduction and granulocytic infiltration, and this disorder is responsive to JAK1/2 inhibition with ruxolitinib.\",\n      \"method\": \"Murine bone marrow transplantation model, pharmacological JAK inhibition (ruxolitinib)\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic model with pharmacological validation\",\n      \"pmids\": [\"24081659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Expression of truncated mutant Csf3r in mice confers a strong clonal advantage at the HSC level dependent on exogenous G-CSF. G-CSF-induced proliferation and Stat5 phosphorylation are increased in mutant HSCs, and the proliferative advantage is abrogated in myeloid progenitors lacking both Stat5A and Stat5B, demonstrating that inappropriate Stat5 activation is key to clonal dominance.\",\n      \"method\": \"Mouse genetic model, HSC isolation, phospho-Stat5 assay, Stat5A/B double knockout epistasis\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with double KO, replicated in multiple assays\",\n      \"pmids\": [\"18292815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"A T617N missense mutation in the CSF3R transmembrane domain energetically favors dimerization, driving constitutive receptor activation and G-CSF hypersensitivity for proliferation and differentiation, causing hereditary chronic neutrophilia. Demonstrated by transmembrane domain dimerization analysis and xenotransplantation assays.\",\n      \"method\": \"Transmembrane domain dimerization assay, xenotransplantation, syngeneic bone marrow engraftment\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — biochemical dimerization assay plus in vivo functional models\",\n      \"pmids\": [\"19620628\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The ubiquitin/proteasome system is required for G-CSFR internalization and degradation. G-CSFR is constitutively ubiquitinated (increasing after ligand binding), and disruption of ubiquitination at lysine 762 (K762R mutant) impairs ligand-induced internalization, enhances Stat5 and Akt activation, and induces hyperproliferative G-CSF responses similar to SCN/AML truncation mutants.\",\n      \"method\": \"Temperature-sensitive E1 ubiquitin enzyme cell line (ts20), K762R mutagenesis, proteasome inhibitor MG132, flow cytometry, signaling assays\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mutagenesis plus pharmacological and genetic dissection of ubiquitin pathway\",\n      \"pmids\": [\"18923646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The E3 ubiquitin ligase Fbw7 (a component of SCF complex) physically associates with G-CSFR and promotes its ubiquitin-mediated proteasomal degradation, reducing STAT3 phosphorylation and inhibiting G-CSF-dependent granulocytic differentiation. GSK3β co-operates with Fbw7 and both are required interdependently for G-CSFR degradation.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, knockdown, STAT3 phosphorylation assay, granulocytic differentiation assay\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP and functional knockdown, single lab\",\n      \"pmids\": [\"23820376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The E3 ubiquitin ligase Fbw7-independent role of the proteasome in G-CSFR regulation: in primary human neutrophils, proteasome inhibition (but not lysosome inhibition) blocks ligand-induced G-CSFR internalization/degradation, contrasting with lysosomal routing in transfected cell lines, demonstrating cell-type-specific post-endocytic routing.\",\n      \"method\": \"ts20 cell line with temperature-sensitive E1 enzyme, chloroquine and MG132 inhibitors, primary neutrophil assay, flow cytometry\",\n      \"journal\": \"Cytokine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological dissection in primary cells and genetic cell line\",\n      \"pmids\": [\"18554923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"E6AP (E3 ubiquitin ligase) physically associates with G-CSFR, targets it for ubiquitin-mediated proteasomal degradation, reduces STAT3 phosphorylation, and inhibits granulocytic differentiation. E6AP knockdown restores G-CSFR signaling and enhances differentiation. The truncation mutant G-CSFR-T718 is also degraded by E6AP but at a slower rate.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, siRNA knockdown, STAT3 phosphorylation assay, differentiation assay\",\n      \"journal\": \"Biochimica et biophysica acta. Molecular cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP with functional validation, single lab\",\n      \"pmids\": [\"28578910\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Novel gain-of-function CSF3R mutations transform cells via four distinct mechanisms: (1) cysteine-mediated disulfide bond dimerization (S581C); (2) polar amino acid substitution at transmembrane dimer interface (Thr-640); (3) increased internalization mimicking low G-CSF dose (Glu-524 substitution); (4) hydrophobic substitutions at membrane-proximal O-glycosylation residues (Thr-612, Thr-615, Thr-618). STAT3 and ERK activation require CSF3R internalization, whereas STAT5 activation occurs at the cell surface.\",\n      \"method\": \"Cellular transformation assay in Ba/F3 cells, sequencing, receptor localization studies, signaling assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional transformation screen with mechanistic follow-up for multiple mutation classes\",\n      \"pmids\": [\"29572350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CSF3R proximal mutations (but not truncation mutations alone) are sufficient to induce leukemia in mice. Both proximal and compound (proximal+truncation) mutations require enhanced MAPK signaling through upregulation of the Ksr1 adaptor protein. MEK1/2 inhibition with trametinib suppresses leukemia from both CSF3R proximal and ruxolitinib-resistant compound mutations.\",\n      \"method\": \"Mouse bone marrow transplantation, whole-genome expression profiling, biochemical experiments, pharmacological MEK inhibition\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vivo genetic model with transcriptomic and pharmacological validation\",\n      \"pmids\": [\"28031554\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CSF3R distal cytoplasmic truncation mutations (Q793-Q823) have leukemogenic potential via markedly decreased receptor degradation due to loss of a de-phosphorylation domain (residues N818-F836). Truncations prior to Q823 increase expression of a higher-molecular-weight (glycosylated) receptor band essential for surface expression and oncogenic potential. Sufficient STAT5 activation is required for oncogenic transformation.\",\n      \"method\": \"Transformation assay in Ba/F3 cells, receptor degradation assay, mutagenesis, surface expression analysis, STAT5 signaling assay\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple functional assays with mutagenesis, single lab\",\n      \"pmids\": [\"28439110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"A point mutation in the G-CSFR gene creating an altered splice donor site leads to overexpression of an SD isoform that lacks the distal C-terminal region (essential for maturation signaling) but retains the membrane-proximal region. The SD isoform has high affinity for G-CSF but cannot transduce growth signals in BAF3 cells and scarcely activates JAK2 kinase.\",\n      \"method\": \"Molecular cloning, BAF3 growth assay, JAK2 kinase activation assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — functional assay with kinase activation measurement, identifies domain-function relationship\",\n      \"pmids\": [\"7531515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Disruption of conserved extracellular cysteine pairs in CSF3R leads to either gain- or loss-of-function. The activating W341C mutation in the fibronectin-like type III extracellular domain transforms cells via cysteine-mediated intermolecular disulfide bonds causing receptor dimerization, and primary samples carrying this mutation are sensitive to JAK inhibitors.\",\n      \"method\": \"Transformation assay in Ba/F3 cells, cysteine mutagenesis, dimerization assay, patient sample drug sensitivity\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional transformation with biochemical dimerization evidence, single lab\",\n      \"pmids\": [\"28652245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"N610 residue of CSF3R is an N-linked glycosylation site (confirmed by mass spectrometry) and primary site of receptor sialylation. Substitution mutations at N610 prevent membrane-proximal N-glycosylation, drive ligand-independent cellular expansion, and activate JAK-STAT signaling, demonstrating that membrane-proximal N-glycosylation maintains ligand dependence of CSF3R.\",\n      \"method\": \"Mass spectrometry glycosylation analysis, Ba/F3 transformation assay, mutagenesis, JAK-STAT signaling assay\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — mass spectrometry glycosylation mapping with functional mutagenesis validation\",\n      \"pmids\": [\"30348809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The T618I CSF3R is O-glycosylated but undergoes enhanced spontaneous internalization and degradation. Proteasome inhibition dramatically increases its surface expression. The O-glycosylated T618I receptor is constitutively tyrosine phosphorylated (unlike WT which requires ligand), correlating with constitutive JAK2 activation, and both mutant receptor and JAK2 are constitutively ubiquitinated.\",\n      \"method\": \"Glycosylation assay, internalization assay, proteasome inhibition, tyrosine phosphorylation assay, JAK2 activation assay, ubiquitination assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical assays, single lab\",\n      \"pmids\": [\"31848046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Neutrophil elastase (NE) proteolytically cleaves G-CSFR at its amino-terminus on human PMN in a time-dependent manner, leading to decreased G-CSFR surface expression and appearance of cleavage fragments, and inhibits G-CSFR-mediated granulopoiesis (CFU-GM formation), establishing a novel negative feedback loop for granulopoiesis regulation.\",\n      \"method\": \"Flow cytometry, western blot of cleavage products, CFU-GM colony assay with primary human bone marrow cells\",\n      \"journal\": \"Journal of inflammation (London, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct biochemical cleavage assay with functional granulopoiesis readout\",\n      \"pmids\": [\"20205821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ALKBH5 (m6A RNA demethylase) directly binds CSF3R mRNA (confirmed by RIP-qPCR) and erases m6A methylation on CSF3R mRNA, increasing mRNA stability and CSF3R protein expression, which upregulates cell surface G-CSFR and downstream STAT3 signaling to drive emergency granulopoiesis and neutrophil mobilization.\",\n      \"method\": \"RIP-qPCR, m6A methylation assay, mRNA stability assay, ALKBH5 KO mouse model, STAT3 signaling assay\",\n      \"journal\": \"Cellular & molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct RNA binding confirmed by RIP-qPCR with in vivo KO validation and mechanistic readouts\",\n      \"pmids\": [\"38114747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Activating CSF3R mutations cooperate with loss-of-function CEBPA mutations to promote AML development at the level of myeloid lineage enhancers, where mutant CEBPA prevents activation of differentiation-associated enhancers. CEBPA mutations must occur as the initial event for leukemia initiation in this cooperative pathway.\",\n      \"method\": \"Mouse genetic models, enhancer chromatin profiling, epistasis testing of mutation order\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic epistasis with epigenomic mechanistic validation in vivo\",\n      \"pmids\": [\"31784538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Functional studies demonstrated that co-expression of mutated RUNX1 and mutated CSF3R in hematopoietic CD34+ cells leads to elevated G-CSF-induced proliferation with diminished myeloid differentiation. Single-cell analyses confirmed RUNX1 and CSF3R mutations reside in the same malignant clone.\",\n      \"method\": \"CD34+ cell functional assay, single-cell analysis, deep sequencing\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional cell assay with single-cell clonality confirmation\",\n      \"pmids\": [\"24523240\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Recessively inherited loss-of-function CSF3R mutations cause severe congenital neutropenia through distinct mechanisms: a homozygous missense mutation (R308C) causes perturbed N-glycosylation and aberrant cell surface localization; compound heterozygous frameshifts cause premature stop codons. Patients have full bone marrow myeloid maturation but do not respond to recombinant G-CSF, establishing functional importance of G-CSFR signaling for peripheral neutrophil numbers.\",\n      \"method\": \"Glycosylation assay, cell surface expression analysis, clinical G-CSF non-response, genetic sequencing\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — biochemical characterization combined with clinical functional validation\",\n      \"pmids\": [\"24753537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"G-CSF receptor knockout mice demonstrate that G-CSFR-mediated clearance is a major mechanism for plasma clearance of both filgrastim and pegfilgrastim; absence of functional G-CSFR significantly increases AUC, prolongs MRT and half-life, and reduces clearance of both forms of G-CSF.\",\n      \"method\": \"G-CSFR knockout mouse pharmacokinetic study, ELISA-based plasma measurement\",\n      \"journal\": \"Pharmacological research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic KO model with rigorous PK analysis\",\n      \"pmids\": [\"15082029\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Truncated G-CSFR cooperates with the PML-RARα oncogene to accelerate AML development in mice in a G-CSF-dependent fashion, establishing a causal contribution of CSF3R truncation mutations to leukemic transformation when combined with a second oncogenic hit.\",\n      \"method\": \"Mouse bone marrow transplantation with PML-RARα + truncated Csf3r co-expression, G-CSF dependence assay\",\n      \"journal\": \"Experimental hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo genetic cooperation model with G-CSF dependence validation\",\n      \"pmids\": [\"21911095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A truncated G-CSFR (d715) found in SCN patients inhibits G-CSF-induced NE expression in a dominant-negative manner and suppresses unfolded protein response and apoptosis induced by SCN-derived NE mutants, associated with sustained AKT and STAT5 activation and augmented BCL-XL expression, providing a mechanism for how CSF3R truncation mutations protect myeloid precursors from NE-mutant-induced apoptosis.\",\n      \"method\": \"Dominant-negative functional assay, UPR assay, apoptosis assay, AKT/STAT5 phosphorylation, BCL-XL expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical readouts in cell-based assays, single lab\",\n      \"pmids\": [\"28073911\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SRSF2 mutations alter CSF3R mRNA splicing, increasing the ratio of splice variant V3 (which confers a hypoproliferative phenotype with defective JAK-STAT activation when expressed alone) relative to V1 (wild-type). SRSF2 knockout in KG-1 and normal CD34+ cells decreased the V3/V1 ratio, establishing SRSF2 as a regulator of CSF3R splicing.\",\n      \"method\": \"Digital PCR splice variant quantitation, functional proliferation assay, JAK-STAT activation assay, SRSF2 knockout\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional splicing assay with genetic validation, single lab\",\n      \"pmids\": [\"31462738\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SRSF2 P95H mutations promote Class IV CSF3R splicing by binding to exonic splicing enhancer (ESE) sequences in CSF3R exon 17 (confirmed by in vitro splicing assay with CSF3R minigene). Class IV isoform add-back in Csf3r-null mouse progenitors increased granulocyte progenitors with impaired neutrophil differentiation, while Class III produced dysmorphic neutrophils, demonstrating functional consequences of altered CSF3R splicing on granulopoiesis.\",\n      \"method\": \"In vitro splicing assay with CSF3R minigene, ESE deletion mutagenesis, Csf3r-null mouse progenitor add-back, differentiation assay\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro splicing reconstitution with mutagenesis and in vivo add-back functional validation\",\n      \"pmids\": [\"35941213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"LRG-mediated acceleration of G-CSF-driven neutrophil differentiation and CD11b expression correlates with increased phospho-STAT3 but not PU.1 or p27(kip1). This effect requires the transmembrane and cytoplasmic domains of G-CSFR (shown using chimeric EpoR/G-CSFR), identifying a distinct non-redundant G-CSFR signaling pathway for LRG function.\",\n      \"method\": \"Chimeric EpoR/G-CSFR transfection, stable LRG transfection in 32Dcl3 cells, phospho-STAT3 assay, differentiation assay\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — chimeric receptor dissection with functional differentiation readout\",\n      \"pmids\": [\"18272588\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Activating mutations in CSF3R are enriched at residues normally occupied by N, T, and S (glycosylated amino acids), confirmed by mass spectrometry detection of GalNAc and Gal-GalNAc O-glycans at WT threonine 618. Domain mapping showed the single domain containing residue 618 is sufficient for ligand-independent activity, pointing to glycosylation of hotspot residues as a key regulatory mechanism for CSF3R ligand dependence.\",\n      \"method\": \"Unbiased mutational screen, domain mapping, mass spectrometry glycan identification\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mass spectrometry-based glycan identification combined with functional domain mapping and mutational screen\",\n      \"pmids\": [\"37116708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"G-CSF infusion in humans dose-independently downregulates its own receptor (CD114) by 75% on neutrophils and induces neutrophil degranulation (CD11b increase >300%), leading to up to 10-fold increase in plasma gelatinase B (MMP-9), which may contribute to neutrophil/stem cell mobilization.\",\n      \"method\": \"Randomized controlled crossover study in healthy volunteers, flow cytometry for CD114 and CD11b, plasma MMP-9 ELISA\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — direct in vivo human experiment with quantitative receptor and functional readouts\",\n      \"pmids\": [\"11091218\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The CSF3R gene was localized to chromosome 1p35-p34.3 by in situ hybridization and PCR-based somatic cell hybrid analysis.\",\n      \"method\": \"In situ hybridization, PCR with somatic cell hybrids, spot-blot hybridization of sorted chromosomes\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple independent mapping methods in single study\",\n      \"pmids\": [\"1833306\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CSF3R T618I cooperates with RUNX1-RUNX1T1 fusion to expand hematopoietic progenitors and increase self-renewal in CD34+ cells, with gene expression profiling revealing upregulation of hedgehog signaling/GLI2 as the cooperative mechanism. Both primary hematopoietic cells and SKNO-1 cells expressing CSF3R T618I show increased sensitivity to the GLI inhibitor GANT61.\",\n      \"method\": \"CD34+ cell transduction, gene expression profiling, pharmacological GLI inhibition in primary cells and cell line\",\n      \"journal\": \"HemaSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — transcriptomic pathway identification with functional pharmacological validation\",\n      \"pmids\": [\"37841755\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CSF3R (G-CSFR) is a cytokine receptor that normally requires G-CSF ligand binding for activation, with receptor dimerization, JAK2 activation, and downstream STAT3/STAT5/ERK signaling driving granulopoiesis; ligand dependence is maintained by membrane-proximal O- and N-glycosylation that prevents constitutive dimerization, and activated receptor is regulated by ubiquitination at K762 (by E3 ligases Fbw7 and E6AP) targeting it for proteasomal/lysosomal degradation. Oncogenic mutations fall into two mechanistically distinct classes: membrane-proximal mutations (e.g., T618I) abolish O-glycosylation causing constitutive ligand-independent dimerization and JAK-STAT signaling, while cytoplasmic truncation mutations remove internalization/degradation motifs causing receptor overexpression, ligand hypersensitivity, and enhanced STAT5 activation; both classes can cooperate with co-mutations in CEBPA, RUNX1, or SETBP1 to drive AML or chronic neutrophilic leukemia.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CSF3R encodes the granulocyte colony-stimulating factor receptor (G-CSFR), a type I cytokine receptor that transduces G-CSF signals through JAK2-STAT3/STAT5 and MAPK/ERK pathways to drive granulopoiesis, neutrophil mobilization, and hematopoietic progenitor proliferation [PMID:7531515, PMID:18292815, PMID:23656643]. Ligand dependence is enforced by membrane-proximal O- and N-glycosylation (at Thr-612/615/618 and Asn-610), which prevents constitutive receptor dimerization; mutations eliminating these glycosylation sites drive ligand-independent JAK-STAT signaling and cellular transformation [PMID:24403076, PMID:30348809, PMID:37116708]. Receptor homeostasis is maintained by ubiquitination at Lys-762 (mediated by E3 ligases Fbw7 and E6AP) targeting G-CSFR for proteasomal and lysosomal degradation, and truncation mutations that delete internalization/degradation motifs cause receptor overexpression, enhanced STAT5 activation, and clonal dominance of hematopoietic stem cells [PMID:9885205, PMID:18923646, PMID:18292815]. Recessive loss-of-function CSF3R mutations cause severe congenital neutropenia, while somatic gain-of-function mutations—particularly membrane-proximal (e.g., T618I) and cytoplasmic truncation classes that cooperate with co-mutations in CEBPA, RUNX1, or SETBP1—drive chronic neutrophilic leukemia and AML [PMID:24753537, PMID:23656643, PMID:31784538].\",\n  \"teleology\": [\n    {\n      \"year\": 1991,\n      \"claim\": \"Establishing the chromosomal location of CSF3R at 1p35-p34.3 provided the foundational genetic mapping needed for subsequent mutation and linkage studies.\",\n      \"evidence\": \"In situ hybridization and PCR-based somatic cell hybrid analysis\",\n      \"pmids\": [\"1833306\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No functional characterization of the locus\", \"Regulatory elements not mapped\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Identification of a splice variant lacking the distal C-terminus revealed that the cytoplasmic domain is essential for JAK2 activation and growth signaling, establishing the first domain-function map of G-CSFR.\",\n      \"evidence\": \"Molecular cloning with BAF3 growth assay and JAK2 kinase activation measurement\",\n      \"pmids\": [\"7531515\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific cytoplasmic residues required for JAK2 coupling not identified\", \"Downstream signaling cascade not yet delineated\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Demonstrating that SCN/AML-associated truncation mutations delete a critical internalization domain explained how these mutations cause G-CSF hypersensitivity through defective receptor downmodulation rather than constitutive activation.\",\n      \"evidence\": \"Functional internalization, ligand binding, and growth signaling assays in transfected cells\",\n      \"pmids\": [\"9885205\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity of the internalization motif not mapped to specific residues\", \"Ubiquitin-dependent vs. ubiquitin-independent internalization not distinguished\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"G-CSFR knockout mouse pharmacokinetic studies established that receptor-mediated endocytosis is a major pathway for plasma clearance of G-CSF ligand, revealing a receptor-level feedback loop controlling systemic G-CSF availability.\",\n      \"evidence\": \"G-CSFR knockout mouse with ELISA-based pharmacokinetic analysis of filgrastim and pegfilgrastim\",\n      \"pmids\": [\"15082029\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of renal vs. receptor-mediated clearance not fully quantified\", \"Tissue-specific receptor recycling not addressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Three contemporaneous studies established the ubiquitin-proteasome system as central to G-CSFR turnover: K762 was identified as the key ubiquitination site controlling internalization and signaling attenuation, truncation mutant mice revealed STAT5 as the essential downstream effector of clonal dominance, and cell-type-specific routing to proteasomal vs. lysosomal degradation was demonstrated.\",\n      \"evidence\": \"K762R mutagenesis with temperature-sensitive E1 cell line and proteasome inhibitors; Stat5A/B double-knockout epistasis in mouse HSCs; primary neutrophil proteasome/lysosome inhibitor comparison\",\n      \"pmids\": [\"18923646\", \"18292815\", \"18554923\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase(s) responsible for K762 ubiquitination not yet identified at this time\", \"Whether STAT5 dependence applies to proximal mutations unknown\", \"Structural basis of cell-type-specific routing unexplained\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The T617N transmembrane mutation demonstrated that energetically favorable dimerization of the transmembrane domain is sufficient for constitutive receptor activation, establishing a second mechanism (distinct from glycosylation loss) for ligand-independent signaling and explaining hereditary chronic neutrophilia.\",\n      \"evidence\": \"Transmembrane domain dimerization assay with xenotransplantation and syngeneic bone marrow engraftment\",\n      \"pmids\": [\"19620628\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural resolution of transmembrane dimer interface lacking\", \"Whether downstream pathway usage differs from extracellular-domain activating mutations not tested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Neutrophil elastase was shown to proteolytically cleave the G-CSFR ectodomain, reducing surface expression and inhibiting granulopoiesis, establishing a neutrophil-intrinsic negative feedback loop distinct from internalization-based downregulation.\",\n      \"evidence\": \"Flow cytometry and western blot of cleavage products with CFU-GM colony assay on primary human bone marrow cells\",\n      \"pmids\": [\"20205821\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cleavage site not mapped to a specific residue\", \"In vivo relevance not confirmed in genetic models\", \"Whether cleavage product retains signaling capacity unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Concurrent studies classified oncogenic CSF3R mutations into membrane-proximal (JAK-pathway-dependent, ruxolitinib-sensitive) and truncation (SRC/TNK2-dependent, dasatinib-sensitive) classes, while the E3 ligase Fbw7 was identified as a GSK3β-dependent mediator of G-CSFR proteasomal degradation controlling STAT3 signaling.\",\n      \"evidence\": \"In vitro transformation with kinase inhibitor panels and primary patient cells; murine BMT model with ruxolitinib; co-IP and ubiquitination assays with Fbw7/GSK3β\",\n      \"pmids\": [\"23656643\", \"24081659\", \"23820376\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Fbw7-G-CSFR interaction confirmed only in one lab\", \"Whether SRC/TNK2 dependence of truncation mutants holds in vivo unclear\", \"Clinical validation of dual inhibitor strategy pending\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The T618I mutation was shown to prevent O-glycosylation at Thr-615/618, directly causing ligand-independent dimerization, while compound proximal+truncation mutations showed cooperative transformation — and separately, recessive CSF3R loss-of-function mutations were shown to cause severe congenital neutropenia through disrupted glycosylation and surface trafficking.\",\n      \"evidence\": \"Glycosylation and dimerization assays in Ba/F3 cells with mutagenesis; patient R308C glycosylation and surface expression analysis; RUNX1-CSF3R co-expression in CD34+ cells\",\n      \"pmids\": [\"24403076\", \"24753537\", \"24523240\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of how O-glycan loss permits dimerization unknown\", \"Whether R308C neutropenia is fully rescued by downstream pathway activation untested\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"In vivo modeling revealed that proximal CSF3R mutations are sufficient for leukemogenesis and require MAPK signaling via the Ksr1 adaptor, with MEK inhibition (trametinib) effective against both proximal and ruxolitinib-resistant compound mutations, identifying an alternative therapeutic vulnerability.\",\n      \"evidence\": \"Mouse BMT model with whole-genome expression profiling and pharmacological MEK1/2 inhibition\",\n      \"pmids\": [\"28031554\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ksr1 mechanism of upregulation by CSF3R mutations not defined\", \"Whether MEK inhibition is effective in human CNL not established\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Multiple studies expanded the mechanistic repertoire: E6AP was identified as a second E3 ligase targeting G-CSFR for degradation; the W341C extracellular mutation was shown to activate via intermolecular disulfide-bonded dimerization; distal truncation mutations (Q793-Q823) were mapped to loss of a dephosphorylation domain; and truncated G-CSFR was shown to protect against NE-mutant-induced apoptosis via sustained AKT/STAT5/BCL-XL.\",\n      \"evidence\": \"Co-IP/ubiquitination assays for E6AP; cysteine mutagenesis/dimerization for W341C; degradation/mutagenesis assays for distal truncations; dominant-negative/UPR/apoptosis assays for NE interaction\",\n      \"pmids\": [\"28578910\", \"28652245\", \"28439110\", \"28073911\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"E6AP and Fbw7 substrate specificity overlap not resolved\", \"Whether W341C and T618I mutations use identical downstream pathways untested\", \"Dephosphorylation domain phosphatase identity unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A comprehensive transformation screen defined four distinct gain-of-function mechanisms (disulfide dimerization, transmembrane polar substitution, enhanced internalization, O-glycosylation loss) and demonstrated that STAT3/ERK activation requires receptor internalization while STAT5 is activated at the cell surface, along with discovery that N-glycosylation at N610 is a critical gatekeeper of ligand dependence.\",\n      \"evidence\": \"Ba/F3 transformation screen with receptor localization and signaling compartmentalization studies; mass spectrometry N-glycan mapping at N610 with mutagenesis\",\n      \"pmids\": [\"29572350\", \"30348809\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Endosomal signaling complex composition uncharacterized\", \"How internalized receptor specifically activates STAT3 but not STAT5 mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Cooperating genetic events were mechanistically resolved: CEBPA loss-of-function must precede CSF3R activation for AML through failure to activate differentiation enhancers, and SRSF2 mutations were shown to alter CSF3R mRNA splicing (increasing the V3 isoform) with functional consequences for JAK-STAT signaling.\",\n      \"evidence\": \"Mouse genetic epistasis with enhancer chromatin profiling for CEBPA; digital PCR splice variant quantitation with SRSF2 KO for splicing\",\n      \"pmids\": [\"31784538\", \"31462738\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether CEBPA mutation order requirement applies to other CSF3R cooperating mutations unknown\", \"Functional consequence of V3 isoform increase in vivo not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"SRSF2 P95H was shown to directly bind exonic splicing enhancer sequences in CSF3R exon 17, promoting Class IV splicing that expands granulocyte progenitors while impairing differentiation, providing a direct RNA-level mechanism linking spliceosome mutations to aberrant G-CSFR signaling.\",\n      \"evidence\": \"In vitro splicing assay with CSF3R minigene, ESE deletion mutagenesis, Csf3r-null mouse progenitor add-back\",\n      \"pmids\": [\"35941213\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether other spliceosome mutations (U2AF1, SF3B1) similarly alter CSF3R splicing untested\", \"Structural basis of SRSF2 P95H recognition of CSF3R ESE not resolved\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Three advances converged: mass spectrometry confirmed O-glycans (GalNAc, Gal-GalNAc) at T618 as the glycosylation event preventing constitutive activation; ALKBH5-mediated m6A demethylation of CSF3R mRNA was identified as a post-transcriptional activator of emergency granulopoiesis; and CSF3R T618I was shown to cooperate with RUNX1-RUNX1T1 via hedgehog/GLI2 upregulation.\",\n      \"evidence\": \"Mass spectrometry glycan identification with unbiased mutational screen; RIP-qPCR and ALKBH5 KO mouse model; CD34+ transduction with GLI inhibitor pharmacology\",\n      \"pmids\": [\"37116708\", \"38114747\", \"37841755\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Glycosyltransferase(s) responsible for T618 O-glycosylation not identified\", \"Whether ALKBH5-CSF3R axis operates in leukemic cells unknown\", \"GLI2 cooperation mechanism not validated in vivo leukemia models\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis of how glycosylation prevents receptor dimerization, the identity of glycosyltransferases modifying the membrane-proximal region, the full composition of endosomal signaling complexes that differentially activate STAT3/ERK vs. STAT5, and whether therapeutic targeting of specific CSF3R mutation classes can be translated to clinical outcomes.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of G-CSFR ectodomain with glycans\", \"Glycosyltransferases for membrane-proximal O-glycosylation unidentified\", \"Endosomal signaling complex composition unknown\", \"Clinical trial data for mutation-class-specific inhibitor strategies lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 2, 5, 10, 13]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 6, 7, 9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [2, 5, 10, 15, 16, 21, 29]},\n      {\"term_id\": \"GO:0005768\", \"supporting_discovery_ids\": [10, 16]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [6, 16]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 2, 4, 5, 10, 13, 15]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [4, 18, 29]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [0, 3, 11, 19, 23]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [6, 7, 9, 16]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [26, 27]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"JAK2\",\n      \"STAT3\",\n      \"STAT5A\",\n      \"STAT5B\",\n      \"FBXW7\",\n      \"UBE3A\",\n      \"ALKBH5\",\n      \"SRSF2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}