{"gene":"SLAMF6","run_date":"2026-04-28T20:42:07","timeline":{"discoveries":[{"year":2001,"finding":"NTB-A (SLAMF6) undergoes tyrosine phosphorylation and associates with the SH2-domain-containing adaptor SH2D1A (SAP) as well as SH2-domain-containing phosphatases (SHPs); in XLP NK cells lacking SAP, NTB-A mediates inhibitory rather than activating signals, demonstrating SAP-dependent switch between activating and inhibitory signaling.","method":"Molecular cloning, Co-immunoprecipitation, functional NK cell cytotoxicity assays with patient cells and mAb-masking experiments","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, patient cell functional assays, multiple orthogonal methods in single study","pmids":["11489943"],"is_preprint":false},{"year":2004,"finding":"NTB-A (SLAMF6) is its own ligand, engaging in homophilic interaction; this homophilic binding activates NK cell cytotoxicity, influences NK cell proliferation, and stimulates IFN-γ secretion.","method":"Recombinant trimeric NTB-A fusion proteins used as probes; functional NK cytotoxicity, proliferation, and cytokine assays; surface plasmon resonance and ELISA confirming homophilic binding","journal":"European journal of immunology / Journal of immunology","confidence":"High","confidence_rationale":"Tier 1–2 — reconstituted homophilic binding with multiple binding assays plus functional validation, replicated across two labs (PMID 15162436 and 15153464)","pmids":["15162436","15153464"],"is_preprint":false},{"year":2004,"finding":"Cross-linking of NTB-A (SLAMF6) induces tyrosine phosphorylation of the receptor and recruitment of SAP; NTB-A co-stimulation with CD3 drives T cell proliferation, IFN-γ secretion, and Th1 differentiation; soluble NTB-A-Fc fusion protein blocks B cell isotype switching and delays experimental autoimmune encephalomyelitis in vivo.","method":"mAb cross-linking, phosphorylation assays, Co-IP, T cell differentiation assays, in vivo EAE model with soluble fusion protein blockade","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal in vitro and in vivo methods in single study","pmids":["14988414"],"is_preprint":false},{"year":2006,"finding":"Crystal structure of the NTB-A (SLAMF6) ectodomain solved at 3.0 Å reveals a rod-like monomer that self-associates into a highly kinked dimer via end-to-end homophilic interaction; structural comparison with CD2-CD58 identifies the molecular basis for binding specificity within the SLAM family.","method":"X-ray crystallography at 3.0 Å resolution","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1 — high-resolution crystal structure with functional interpretation","pmids":["17045824"],"is_preprint":false},{"year":2006,"finding":"NTB-A (SLAMF6) is constitutively tyrosine phosphorylated in unstimulated NK cells by Src family kinases, likely due to homophilic NK-NK interactions; the second ITSM tyrosine (Y2) is essential for NTB-A-mediated cytotoxicity; EAT-2 (not SAP) is recruited to Y2 and is required for cytotoxicity, while SAP (not EAT-2) is required for NTB-A-mediated IFN-γ production, revealing differential adapter requirements for cytotoxicity vs. cytokine release.","method":"NTB-A-negative NK cell line reconstituted with cytoplasmic tail mutants; SAP knockdown; EAT-2 knockdown; cytotoxicity and IFN-γ production assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with mutagenesis plus genetic knockdown with defined phenotypic readouts","pmids":["16920955"],"is_preprint":false},{"year":2006,"finding":"The Ly108.2 allele (normal), but not the lupus-associated Ly108.1 allele, sensitizes immature B cells to deletion and RAG re-expression, establishing Ly108 (SLAMF6) as a regulator of B cell tolerance checkpoints.","method":"Genetic analysis of congenic mouse strains, B cell functional assays (anergy, deletion, receptor revision)","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — genetic comparison of allelic variants with multiple B cell tolerance readouts","pmids":["16778059"],"is_preprint":false},{"year":2007,"finding":"Homophilic engagement of Slamf6 (Ly108) and Slamf1 on cortical thymocytes generates 'second signals' requiring SAP recruitment and Fyn kinase activation; these signals are essential for NKT cell lineage development and only occur during T-T (not T-stromal cell) interactions because stromal cells do not express Slamf6 or Slamf1.","method":"Targeted gene disruption (Slamf6 and Slamf1 knockout mice), genetic epistasis with SAP and Fyn mutants, NKT cell developmental assays","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 — multiple gene knockouts with epistasis, replicated in vivo developmental assay","pmids":["18031695"],"is_preprint":false},{"year":2005,"finding":"Ly108 (SLAMF6) controls neutrophil bactericidal activity: Ly108-deficient neutrophils have severely reduced reactive oxygen species production after bacterial phagocytosis and increased susceptibility to Salmonella typhimurium infection; Ly108 also regulates CD4+ T cell IL-4 production.","method":"Targeted disruption of Ly108 exons 2 and 3 in mice; in vitro and in vivo Salmonella infection assays; ROS measurement; cytokine assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined cellular and molecular phenotypes","pmids":["15879084"],"is_preprint":false},{"year":2008,"finding":"Ly108 (SLAMF6) mediates tyrosine phosphorylation signaling involving Vav-1 and c-Cbl in a manner strictly dependent on SAP expression and Fyn kinase; the lupus-associated Ly108-1 isoform triggers stronger tyrosine phosphorylation than Ly108-2 due to an additional unique intra-cytoplasmic tyrosine-based motif.","method":"In vitro phosphorylation assays, co-immunoprecipitation, comparison of T cells from SAP-deficient and FynT-mutant mice, isoform-specific signaling analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic backgrounds tested, SAP/Fyn epistasis, isoform comparison with mechanistic follow-up","pmids":["18482989"],"is_preprint":false},{"year":2010,"finding":"HIV-1 Vpu downmodulates NTB-A (SLAMF6) surface expression on infected CD4+ T cells through its transmembrane region, retaining NTB-A within the Golgi by affecting glycosylation (only high-mannose form detectable), thereby preventing NK cell degranulation and protecting infected cells from NK-mediated lysis.","method":"Vpu mutant virus infection assays, NK cell degranulation assays, glycosylation analysis, co-immunoprecipitation of Vpu-NTB-A association","journal":"Cell host & microbe / Virology","confidence":"High","confidence_rationale":"Tier 2 — mechanistic delineation with Vpu mutants, glycosylation analysis, functional NK assays; replicated across two papers (PMID 21075351, 23528733)","pmids":["21075351","23528733"],"is_preprint":false},{"year":2012,"finding":"Deletion of Ly108 (Slamf6) in SAP-deficient CD4+ T cells reverses the germinal center defect of Sh2d1a-/- mice; Ly108 negative signaling requires ITSMs and SHP-1 recruitment, generating high amounts of SHP-1 at the T cell:B cell synapse and limiting T:B adhesion; SAP and SHP-1 compete for Ly108 ITSM binding to act as a rheostat for T cell help.","method":"Genetic epistasis (Slamf6-/- crossed to Sh2d1a-/-), germinal center assays, SHP-1 recruitment assays at immunological synapse, ITSM mutant analysis","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 — clean double KO epistasis with mechanistic molecular follow-up","pmids":["22683125"],"is_preprint":false},{"year":2013,"finding":"Ly108 (SLAMF6) is constitutively tyrosine phosphorylated in murine thymus in a SAP- and Fyn kinase-dependent manner; phosphorylation is rapidly lost after thymocyte disaggregation indicating dynamic contact-mediated regulation; the Ly108-H1 isoform does not undergo tyrosine phosphorylation, suggesting it functions as a decoy isoform.","method":"Thymocyte phosphorylation assays, SAP and Fyn KO comparisons, isoform-specific phosphorylation analysis","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic controls with mechanistic isoform comparison","pmids":["22393150"],"is_preprint":false},{"year":2013,"finding":"Ly108 (SLAMF6) co-stimulation of preselection double-positive thymocytes markedly enhances PLZF transcription factor expression compared to TCR stimulation alone; this occurs through increased Egr-2 expression and Egr-2 binding to the Zbtb16 (PLZF) promoter; Ly108-deficient mice have decreased PLZF-expressing CD4+ T cells.","method":"Chromatin immunoprecipitation (Egr-2 at Zbtb16 promoter), flow cytometry, Ly108 KO mouse analysis, co-stimulation assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — ChIP with KO validation and mechanistic pathway definition","pmids":["23355739"],"is_preprint":false},{"year":2014,"finding":"SAP facilitates recruitment and activation of LCK (but not FYN) at NTB-A (SLAMF6) receptors in activated human T cells upon TCR restimulation; both ITSMs are required; NTB-A-associated LCK phosphorylation and kinase activity amplify proximal TCR signaling to promote restimulation-induced cell death (RICD); this is abrogated in XLP (SAP-deficient) T cells.","method":"Co-immunoprecipitation, kinase activity assays, SAP siRNA knockdown, comparison with XLP patient T cells, RICD assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP, kinase assays, patient cell validation, multiple orthogonal methods","pmids":["24688028"],"is_preprint":false},{"year":2014,"finding":"Ly108 (SLAMF6) dampens T cell adhesion to B cells and dendritic cells by inhibiting CD3ζ phosphorylation through two levels of regulated Ly108-CD3ζ interaction: (1) constitutive colocalization-dependent inhibition via SHP-1 associated with Ly108, and (2) ligation-dependent Ly108-CD3ζ interaction requiring the Ly108 transmembrane domain, leading to more efficient CD3ζ dephosphorylation.","method":"Co-immunoprecipitation of Ly108-CD3ζ, transmembrane domain swap mutants, proximity assays, T-B conjugation assays, phosphorylation measurements","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1–2 — mechanistic mutant analysis with two distinct modes of Ly108-CD3ζ interaction defined","pmids":["25217164"],"is_preprint":false},{"year":2015,"finding":"SLAMF6 deletion combined with SLAMF1 and SLAMF5 deletion results in enhanced T-dependent and T-independent antibody responses; both B and T cells from triple knockout mice contribute to enhanced responses; anti-SLAMF6 mAb treatment inhibits Tfh cell and GC B cell development, establishing SLAMF6 as a negative regulator of humoral immunity.","method":"Single and triple gene KO mice, adoptive co-transfer assays, anti-SLAMF6 mAb treatment, GC and Tfh cell analysis","journal":"Frontiers in immunology","confidence":"High","confidence_rationale":"Tier 2 — multiple genetic KO combinations plus adoptive transfer dissection of cell-intrinsic roles","pmids":["25926831"],"is_preprint":false},{"year":2016,"finding":"SLAMF6 on NK cells enhances NK cell activation against nonhematopoietic target cells (which lack SLAM ligands) through a mechanism regulated by SAP adaptors; SAP uncouples SLAMF6 from SHP-1, reducing the negative effect of SLAMF6 on NK responsiveness toward nonhematopoietic targets, defining a SLAM-SAP pathway that influences NK cell 'education'.","method":"SLAMF6 and SAP family knockout mice, NK cell activation assays against hematopoietic and nonhematopoietic targets, phosphatase association analysis","journal":"Nature immunology","confidence":"High","confidence_rationale":"Tier 2 — clean KO studies with mechanistic SAP/SHP-1 pathway definition","pmids":["26878112"],"is_preprint":false},{"year":2016,"finding":"Transfer of Slamf6-/- CD4+ T cells induces SLE-like autoimmunity with elevated autoantibodies, Tfh cells, and GC B cells; the Slamf6-H1 isoform expressed in Slamf6-/- T cells does not cause this phenotype; Slamf1 is required for the pro-autoimmune effect of Slamf6 deficiency, placing SLAMF6 as an inhibitory receptor that controls autoimmune responses in cooperation with SLAMF1.","method":"Adoptive transfer of KO T cells into bm12 recipients, multi-receptor KO epistasis analysis, autoantibody measurement, Tfh/GC analysis","journal":"Clinical immunology","confidence":"High","confidence_rationale":"Tier 2 — epistasis between multiple SLAM KOs with in vivo autoimmunity readouts","pmids":["27368806"],"is_preprint":false},{"year":2011,"finding":"SLAMF3 and SLAMF6 co-engagement with CD3 under Th17 polarizing conditions increases IL-17 production in a SAP-dependent manner; SLAM co-stimulation promotes RORγt recruitment to the IL17A promoter and increases nuclear NFAT1 occupancy; SLAMF6-driven IL-17 production is severely defective in SLE T cells.","method":"mAb co-stimulation assays, SAP-deficient controls, chromatin immunoprecipitation (RORγt and NFAT1 at IL17A promoter), cytokine ELISAs","journal":"Journal of immunology / The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — ChIP with mechanistic co-stimulation assays and SAP-dependency confirmed","pmids":["22184727","22989874"],"is_preprint":false},{"year":2017,"finding":"SLAMF6 homophilic interactions between naive T and B cells induce cell type-specific signals mediated by SAP adaptors, leading to upregulation of migration inhibitory factor (MIF) in T cells and augmented CD74 expression on B cells, consequently enhancing B cell survival; SAP deficiency in XLP patients reduces CD74 expression and perturbs naive B cell maintenance.","method":"Cell-cell interaction assays, SAP-deficient patient analysis, cytokine and receptor expression measurements, XLP patient B cell survival assays","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — mechanistic signaling cascade defined with patient cell validation","pmids":["28904129"],"is_preprint":false},{"year":2017,"finding":"Trans Ly108 (SLAMF6) interactions between dendritic cells and iNKT cells are critical for robust iNKT cell activation; siRNA knockdown and peptide-blocking strategies specifically abrogated trans-Ly108-mediated co-stimulation; Ly108 co-stimulation similarly enhanced human iNKT cell activation.","method":"siRNA knockdown, peptide-blocking, functional iNKT activation assays in mice and human cells","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — genetic knockdown plus blocking strategy with functional readouts in two species","pmids":["28373584"],"is_preprint":false},{"year":2019,"finding":"SLAMF6 clustering specifically with TCR at the immunological synapse dramatically increases downstream TCR signaling; tyrosine 308 in the SLAMF6 cytoplasmic tail is crucial for T cell function enhancement; the SLAMF6 ectodomain is required for function but not for synapse recruitment; SLAMF6 enhances T cell adhesiveness through activation of the small GTPase Rap1.","method":"Biochemical clustering assays, cytoplasmic tail tyrosine mutants, imaging studies of synapse localization, Rap1 activation assays, genetic SLAMF6 deletion","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — mutagenesis, imaging, and GTPase activation assays with multiple orthogonal approaches","pmids":["31199820"],"is_preprint":false},{"year":2013,"finding":"NK cytotoxicity mediated by NTB-A (SLAMF6) via 2B4 is dependent on SAP acting downstream of receptor phosphorylation; SAP knockdown does not affect lipid raft recruitment or receptor phosphorylation, but abrogates EAT-2 recruitment to NTB-A, revealing novel cooperativity between SAP and EAT-2 adaptors.","method":"SAP knockdown in primary human NK cells, raft fractionation, phosphorylation assays, EAT-2 recruitment assays, cytotoxicity assays","journal":"Frontiers in immunology","confidence":"High","confidence_rationale":"Tier 2 — genetic knockdown with mechanistic dissection of signaling hierarchy","pmids":["23346089"],"is_preprint":false},{"year":2021,"finding":"The canonical SLAMF6 isoform inhibits T cell activation through SAP recruitment, while the short splice isoform SLAMF6Δ17-65 has a strong agonistic effect dependent on SHP-1; the costimulatory action of SLAMF6Δ17-65 leads to a cytotoxic molecular profile mediated by TBX21 and RUNX3 expression; splice-switching antisense oligonucleotides promoting SLAMF6Δ17-65 improved tumor-infiltrating lymphocyte anti-tumor function.","method":"Isoform expression, SAP and SHP-1 functional assays, transcription factor expression profiling, ASO-mediated splice switching, in vivo tumor model","journal":"Cancer immunology research","confidence":"High","confidence_rationale":"Tier 2 — isoform mechanistic dissection with SAP/SHP-1 dependency, in vivo validation","pmids":["33762352"],"is_preprint":false},{"year":2022,"finding":"SLAMF6 co-localization with the CD3 complex enhances T cell activity; co-immunoprecipitation revealed SLAMF6 interacts with proteins essential for TCR downstream signaling; bispecific anti-CD3/SLAMF6 antibodies promoting SLAMF6-CD3 clustering enhanced T cell activation, while anti-CD45/SLAMF6 antibodies inhibiting SLAMF6-TCR clustering also enhanced activation through steric hindrance.","method":"Co-immunoprecipitation, biochemical colocalization assays, bispecific antibody functional studies, co-culture assays","journal":"Life science alliance","confidence":"High","confidence_rationale":"Tier 2 — co-IP with multiple antibody-based functional tests defining SLAMF6 proximity to TCR complex","pmids":["36622343"],"is_preprint":false},{"year":2016,"finding":"CRISPR-mediated triple knockout of SLAMF1, SLAMF5, and SLAMF6 worsens iNKT cell development defects seen in SLAMF6 single knockouts, supporting positive signaling roles for these receptors in iNKT development with potential redundancy; triple KO does not grossly affect conventional T or B cell development.","method":"Cas9/CRISPR triple gene disruption, flow cytometric analysis of lymphocyte development","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 2 — triple KO with clear developmental epistasis readout","pmids":["27258160"],"is_preprint":false},{"year":2022,"finding":"SLAMF6/Ly108 promotes macrophage M2 polarization in hepatocellular carcinoma; Ly108 siRNA silencing in macrophages suppresses M2 polarization and attenuates HCC cell migration and invasion by inhibiting the NF-κB pathway; the tumor microenvironment upregulates Ly108 expression in macrophages.","method":"siRNA knockdown of Ly108 in macrophages, M2 polarization marker assays (RT-qPCR), NF-κB pathway analysis, clonogenic and Transwell assays, murine HCC model","journal":"Oncology letters","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA KD with defined pathway, but single lab, moderate mechanistic depth","pmids":["35126725"],"is_preprint":false},{"year":2016,"finding":"NTB-A (SLAMF6) and 2B4 directly bind influenza hemagglutinin (HA) in a sialic acid-dependent manner and co-stimulate NK cell killing of influenza-infected cells; viral neuraminidase counteracts these interactions.","method":"Direct receptor-HA binding assays, sialylation-dependent binding identification, NK cytotoxicity assays, binding site mutagenesis","journal":"Oncotarget","confidence":"High","confidence_rationale":"Tier 2 — direct binding assays with sialic acid dependency and functional cytotoxicity validation","pmids":["26919106"],"is_preprint":false},{"year":2020,"finding":"SLAMF6 absence in CD8+ T cells skews toward an effector phenotype with T-bet as the dominant transcription factor and acquisition of effector-memory phenotype; SLAMF6-/- Pmel-1 T cells show improved polyfunctionality, superior tumor cytolysis, and lasting tumor regression upon adoptive transfer; LAG-3 is upregulated in SLAMF6-/- cells and combined LAG-3 blockade further improves anti-tumor response.","method":"SLAMF6-/- x Pmel-1 TCR transgenic mice, adoptive transfer melanoma model, transcription factor analysis, cytolysis assays","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 — clean genetic KO in defined TCR transgenic model with in vivo tumor regression readout","pmids":["32122464"],"is_preprint":false},{"year":2025,"finding":"SLAMF6 is triggered in cis by homotypic interactions at the T cell surface; these cis interactions elicit inhibitory effects that suppress T cell activation and limit anti-tumor immunity independently of SLAMF6 expression on tumor cells; antibodies disrupting cis interactions strongly augment T cell activation and inhibit tumor growth in vivo.","method":"cis homotypic interaction assays, mAb blocking experiments, T cell activation assays, in vivo tumor models, comparison of cis vs. trans blocking antibodies","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 — mechanistic delineation of cis vs. trans signaling with in vitro and in vivo validation; published in Nature","pmids":["41673151"],"is_preprint":false},{"year":2025,"finding":"Aberrant expression of SLAMF6 on primitive AML cells constitutes an immune evasion mechanism; SLAMF6 knockout in AML cells enables T cell activation and killing; an antibody targeting the SLAMF6 dimerization site inhibits SLAMF6-SLAMF6 homophilic interaction and restores T cell killing both in vitro and in humanized in vivo models.","method":"CRISPR KO of SLAMF6 in AML cells, T cell coculture cytotoxicity assays, dimerization-blocking antibody, humanized in vivo AML models","journal":"Nature cancer","confidence":"High","confidence_rationale":"Tier 2 — CRISPR KO plus mechanistic antibody targeting of dimerization interface with in vivo validation","pmids":["41044242"],"is_preprint":false},{"year":2025,"finding":"SLAMF6 blockade impairs actin ring formation at the immunological synapse between HIV-specific CTLs and HIV-infected CD4+ T cells, reducing CD8+-CD4+ T cell conjugate formation and killing efficiency of HIV-specific CTLs.","method":"Anti-SLAMF6 blocking antibody, conjugate formation assays, immunological synapse imaging (actin ring), CTL killing assays with PLWH-derived CTL lines","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 — functional blocking with synapse imaging, but preprint only","pmids":["39896504"],"is_preprint":true},{"year":2025,"finding":"SLAMF6 expression level on immature thymocytes affects basal TCR signaling in preselected double-positive thymocytes; low SLAMF6 expression (as in BALB/c mice) results in high basal TCR signaling, associated with iNKT2 cell expansion; this reveals SLAMF6 as a regulator of basal TCR signaling influencing iNKT lineage diversity.","method":"Strain comparison (BALB/c vs B6), SLAMF6 expression measurement, basal TCR signaling assays in preselected DP thymocytes, iNKT subset analysis","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2 — correlative strain comparison with mechanistic TCR signaling assays, single lab","pmids":["40405353"],"is_preprint":false},{"year":2018,"finding":"Soluble SLAMF6 ectodomain (seSLAMF6, 203 aa) reduces activation-induced cell death in tumor-infiltrating lymphocytes, enhances IFN-γ secretion and cytolytic activity of CD8+ T cells, and expedites the loss of phosphorylation on SLAMF6 following TCR triggering; systemic administration sustains adoptively transferred CD8+ T cells in vivo and induces tumor clearance.","method":"Recombinant ectodomain protein, AICD assays, cytokine ELISA, phosphorylation assays, in vivo adoptive transfer tumor model","journal":"Cancer immunology research","confidence":"High","confidence_rationale":"Tier 2 — reconstituted ectodomain with mechanistic phosphorylation readout and in vivo efficacy","pmids":["29305520"],"is_preprint":false},{"year":2011,"finding":"A novel isoform, Ly108-H1, is absent in lupus-prone congenic mice but present in C57BL/6 mice; transgenic expression of Ly108-H1 in B6.Sle1b mice markedly diminishes T cell-dependent autoimmunity, establishing the H1 isoform as an immune-suppressing variant of Ly108.","method":"Transgenic mouse generation, autoantibody measurement, T cell-dependent autoimmunity assays in congenic lupus model","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — transgenic rescue experiment with clean autoimmune phenotype readout","pmids":["21422172"],"is_preprint":false},{"year":2015,"finding":"B cell-intrinsic expression of lupus-associated CD84 and Ly108 (SLAMF6) in germinal center B cells is sufficient to break B cell tolerance and increase autoantibody production; B6.Sle1b B cells have reduced BCR signaling and lower frequency of B-T cell conjugates compared to B6 controls overexpressing B6 Ly108; Ly108 modulates B cell tolerance at the GC checkpoint.","method":"BAC-transgenic mice overexpressing B6 Ly108 and CD84, GC analysis, BCR signaling assays, B-T cell conjugate frequency, autoantibody measurement","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — transgenic overexpression with B cell-specific dissection of GC tolerance mechanism","pmids":["25801429"],"is_preprint":false}],"current_model":"SLAMF6 (Ly108/NTB-A) is a homophilic receptor of the immunoglobulin superfamily that engages in both cis (same-cell, inhibitory) and trans (cell-cell, context-dependent activating or inhibitory) homotypic interactions; its cytoplasmic ITSMs recruit either SAP—which recruits Fyn kinase and LCK to amplify downstream signaling and displace the inhibitory phosphatase SHP-1—or SHP-1 directly when SAP is absent, thereby functioning as a molecular switch between activating and inhibitory signals in NK cells, T cells, and B cells; it is essential for NKT cell lineage development via SAP/Fyn-dependent co-stimulation during T-T thymic interactions, regulates T follicular helper:GC B cell interactions and humoral immunity, and controls neutrophil bactericidal ROS production, with its balance between isoforms and adaptor availability critically influencing autoimmunity and anti-tumor immunity."},"narrative":{"teleology":[{"year":2001,"claim":"Identification of NTB-A as an NK-cell receptor whose signaling output—activating or inhibitory—depends on the presence of SAP resolved why XLP patients have defective NK cytotoxicity and established SLAMF6 as a SAP-dependent signaling switch.","evidence":"Molecular cloning, co-immunoprecipitation of SAP and SHPs, functional NK cytotoxicity assays with XLP patient cells","pmids":["11489943"],"confidence":"High","gaps":["Downstream effectors beyond SAP/SHP association not yet defined","Ligand identity unknown at this point"]},{"year":2004,"claim":"Demonstration that SLAMF6 is its own ligand and co-stimulates T cell proliferation, Th1 differentiation, and B cell isotype switching established the receptor as a homophilic co-stimulatory molecule operating in both innate and adaptive immunity.","evidence":"Recombinant trimeric NTB-A fusion proteins for homophilic binding (SPR, ELISA), T cell co-stimulation assays, in vivo EAE blockade with soluble NTB-A-Fc","pmids":["15162436","15153464","14988414"],"confidence":"High","gaps":["Structural basis of homophilic interaction unresolved","Relative contribution to T versus NK biology unclear"]},{"year":2005,"claim":"Ly108 knockout mice revealed an unexpected non-lymphocyte role: SLAMF6 controls neutrophil bactericidal ROS production and host defense against Salmonella, broadening the receptor's functional scope beyond NK and T cells.","evidence":"Targeted Ly108 disruption in mice, in vitro and in vivo Salmonella infection, ROS measurement","pmids":["15879084"],"confidence":"High","gaps":["Mechanism linking SLAMF6 to NADPH oxidase activation not defined","Whether SAP adaptors mediate the neutrophil phenotype unknown"]},{"year":2006,"claim":"The crystal structure of the NTB-A ectodomain at 3.0 Å revealed a rod-like monomer self-associating into a kinked dimer, providing the molecular basis for homophilic specificity within the SLAM family, while mutagenesis of cytoplasmic ITSMs and adaptor knockdown dissected differential EAT-2 (cytotoxicity) versus SAP (IFN-γ) requirements and identified the lupus-associated Ly108.1 allele as a regulator of B cell tolerance checkpoints.","evidence":"X-ray crystallography; reconstitution of NTB-A tail mutants in NK cells with SAP/EAT-2 knockdown; genetic analysis of congenic lupus-prone mouse strains with B cell tolerance assays","pmids":["17045824","16920955","16778059"],"confidence":"High","gaps":["Structural determinants of adaptor selectivity at ITSM not resolved at atomic level","How allelic variants differentially engage downstream signaling in B cells mechanistically unclear"]},{"year":2007,"claim":"Genetic epistasis in Slamf6/Slamf1 double-KO, SAP-KO, and Fyn-KO mice established that SLAMF6 homophilic engagement during thymocyte–thymocyte interactions provides SAP/Fyn-dependent co-stimulation essential for NKT cell lineage commitment.","evidence":"Single and compound gene knockouts with NKT cell developmental analysis in thymus","pmids":["18031695"],"confidence":"High","gaps":["Whether SLAMF6 acts at selection or expansion stage of NKT development not resolved","Transcription factor targets downstream of SAP/Fyn in NKT lineage unknown"]},{"year":2008,"claim":"Signaling biochemistry downstream of Ly108 was mapped: SAP- and Fyn-dependent phosphorylation of Vav-1 and c-Cbl, with the lupus-associated Ly108-1 isoform triggering stronger signaling due to an additional cytoplasmic tyrosine, providing a molecular explanation for allelic autoimmune susceptibility.","evidence":"Phosphorylation assays and co-IP in T cells from SAP-KO and Fyn-mutant mice, isoform comparison","pmids":["18482989"],"confidence":"High","gaps":["Quantitative contribution of Vav-1 versus c-Cbl to downstream phenotypes unknown","Isoform-specific interactomes not comprehensively mapped"]},{"year":2010,"claim":"HIV-1 Vpu was shown to retain NTB-A in the Golgi by preventing glycosylation maturation, thereby shielding infected cells from NK-mediated killing, establishing SLAMF6 as a target of viral immune evasion.","evidence":"Vpu mutant virus infection, glycosylation analysis, NK degranulation assays, co-IP of Vpu–NTB-A","pmids":["21075351","23528733"],"confidence":"High","gaps":["Precise Vpu–NTB-A binding interface unknown","Whether other SLAM family members are similarly targeted not addressed"]},{"year":2011,"claim":"Discovery that the Ly108-H1 isoform suppresses autoimmunity when transgenically expressed in lupus-prone mice, and that SLAMF6 co-stimulation promotes IL-17 production via RORγt and NFAT1 recruitment to the IL17A promoter, revealed isoform-specific and SAP-dependent control of T helper differentiation pathways.","evidence":"Transgenic Ly108-H1 mice in B6.Sle1b background; ChIP for RORγt and NFAT1 at IL17A promoter; SAP-deficient controls","pmids":["21422172","22184727","22989874"],"confidence":"High","gaps":["How Ly108-H1 mechanistically suppresses signaling (decoy versus active inhibition) unclear","Whether SLAMF6-driven Th17 effect is cell-autonomous not fully resolved"]},{"year":2012,"claim":"The SAP-SHP-1 rheostat model was established: deletion of Ly108 in SAP-deficient mice rescued germinal center responses by removing the SHP-1-recruiting inhibitory signal, proving that SLAMF6 ITSMs serve as a competitive binding platform where SAP and SHP-1 antagonize each other to regulate T cell help to B cells.","evidence":"Slamf6−/− × Sh2d1a−/− double-KO epistasis, SHP-1 recruitment imaging at immunological synapse, ITSM mutant analysis","pmids":["22683125"],"confidence":"High","gaps":["Quantitative kinetics of SAP versus SHP-1 competition at the ITSM not measured","Whether phosphatase SHP-2 also participates in this rheostat not tested"]},{"year":2013,"claim":"SLAMF6 was linked to transcriptional programming of innate-like T cells: co-stimulation of preselection thymocytes enhanced PLZF expression through Egr-2 binding to the Zbtb16 promoter, while SAP was shown to be required upstream of EAT-2 recruitment to NTB-A for NK cytotoxicity, defining an adaptor hierarchy.","evidence":"ChIP for Egr-2 at Zbtb16 promoter, Ly108-KO thymocyte analysis; SAP knockdown in NK cells with EAT-2 recruitment assays","pmids":["23355739","23346089","22393150"],"confidence":"High","gaps":["Whether Egr-2–PLZF axis is exclusive to Ly108 or shared with other SLAM receptors unknown","How phosphorylation-incompetent Ly108-H1 exerts its effects in thymus not defined"]},{"year":2014,"claim":"Two mechanistic refinements emerged: SAP recruits LCK (not Fyn) to NTB-A in activated human T cells to amplify proximal TCR signaling and promote restimulation-induced cell death, and Ly108 dampens T–B adhesion through a two-level CD3ζ dephosphorylation mechanism involving constitutive SHP-1 colocalization and ligation-dependent transmembrane domain interaction.","evidence":"Co-IP and kinase activity assays with XLP patient T cells; Ly108 transmembrane swap mutants with T–B conjugation assays","pmids":["24688028","25217164"],"confidence":"High","gaps":["Whether LCK recruitment occurs in all T cell subsets or only restimulated cells unclear","Structural basis of transmembrane domain-mediated Ly108–CD3ζ interaction unresolved"]},{"year":2015,"claim":"SLAMF6 was established as a negative regulator of humoral immunity: anti-SLAMF6 mAb treatment inhibited Tfh and GC B cell development, and B cell-intrinsic Ly108 expression modulated GC tolerance, BCR signaling strength, and autoantibody production.","evidence":"Single and triple SLAM KO mice, adoptive transfer, anti-SLAMF6 mAb in vivo; BAC-transgenic Ly108 overexpression with GC and BCR signaling analysis","pmids":["25926831","25801429"],"confidence":"High","gaps":["Whether SLAMF6 inhibits Tfh through cis or trans interactions not distinguished","Downstream phosphatase versus adaptor usage in GC B cells not defined"]},{"year":2016,"claim":"Multiple studies converged to show SLAMF6 tunes NK education (SAP uncouples SLAMF6 from SHP-1 to allow NK responsiveness toward non-hematopoietic targets), cooperates with SLAMF1 to restrain autoimmunity, and worsens iNKT developmental defects when deleted in combination with other SLAM receptors.","evidence":"SLAMF6-KO and SAP-KO NK assays against hematopoietic and non-hematopoietic targets; Slamf6-KO T cell adoptive transfer autoimmunity; CRISPR triple-KO iNKT analysis","pmids":["26878112","27368806","27258160","26919106"],"confidence":"High","gaps":["Molecular basis of NK 'education' by SLAMF6–SHP-1 not fully elucidated","Whether SLAMF6 binding to influenza HA has physiological relevance in vivo unclear"]},{"year":2017,"claim":"SLAMF6 homophilic trans interactions between T and B cells were shown to induce cell-type-specific downstream programs—MIF secretion in T cells and CD74 upregulation in B cells promoting B cell survival—and SLAMF6 trans engagement on dendritic cells was required for optimal iNKT cell activation.","evidence":"T–B cell interaction assays with XLP patient cells; siRNA and peptide-blocking of Ly108 in DC–iNKT co-cultures","pmids":["28904129","28373584"],"confidence":"High","gaps":["Whether MIF–CD74 axis is the primary B cell survival pathway downstream of SLAMF6 not confirmed by genetic rescue","Signaling cascade linking Ly108 engagement on DCs to iNKT activation not mapped"]},{"year":2018,"claim":"A soluble SLAMF6 ectodomain was shown to enhance TIL function by reducing activation-induced cell death and accelerating SLAMF6 dephosphorylation, providing the first therapeutic proof-of-concept for modulating SLAMF6 signaling to boost anti-tumor immunity.","evidence":"Recombinant ectodomain protein, AICD and phosphorylation assays, in vivo adoptive transfer tumor model","pmids":["29305520"],"confidence":"High","gaps":["Whether soluble ectodomain disrupts cis or trans interactions selectively not determined","Pharmacokinetics and target engagement in vivo not characterized"]},{"year":2019,"claim":"SLAMF6 clustering with the TCR at the immunological synapse was shown to amplify downstream signaling through Rap1 GTPase activation, with tyrosine 308 in the cytoplasmic tail critical for this effect, providing a spatial mechanism for SLAMF6 co-stimulation.","evidence":"Biochemical clustering and Rap1 activation assays, cytoplasmic tail Y308 mutants, synapse imaging","pmids":["31199820"],"confidence":"High","gaps":["GEF linking SLAMF6 to Rap1 activation not identified","Whether Y308-dependent signaling is SAP-dependent or independent not tested"]},{"year":2020,"claim":"SLAMF6 deletion in CD8+ T cells skewed toward a T-bet-dominant effector phenotype with enhanced polyfunctionality and lasting tumor regression, identifying SLAMF6 as an inhibitory checkpoint whose absence improves adoptive cell therapy; LAG-3 upregulation was identified as a compensatory mechanism.","evidence":"SLAMF6−/− × Pmel-1 TCR transgenic mice, adoptive transfer melanoma model, transcription factor and cytolysis analysis","pmids":["32122464"],"confidence":"High","gaps":["Whether the effector skewing is due to loss of cis or trans SLAMF6 engagement not determined at this time","Interaction between SLAMF6 and other checkpoint receptors beyond LAG-3 not explored"]},{"year":2021,"claim":"Isoform-level dissection revealed that canonical SLAMF6 is inhibitory through SAP, while the SLAMF6Δ17-65 splice variant is agonistic through SHP-1 and drives a TBX21/RUNX3 cytotoxic program; splice-switching antisense oligonucleotides promoting this isoform improved anti-tumor TIL function, opening a new therapeutic modality.","evidence":"Isoform functional assays, SAP and SHP-1 dependency analysis, ASO-mediated splice switching in TILs, in vivo tumor model","pmids":["33762352"],"confidence":"High","gaps":["Crystal structure of SLAMF6Δ17-65 ectodomain and how deletion alters homophilic binding unknown","Whether the short isoform engages in cis or only trans interactions not tested"]},{"year":2022,"claim":"Bispecific antibody studies confirmed that SLAMF6 physical proximity to the CD3 complex is functionally important—forcing co-clustering enhanced T cell activation—while a separate study showed SLAMF6 promotes macrophage M2 polarization in hepatocellular carcinoma through NF-κB, extending SLAMF6 function into tumor-associated macrophage biology.","evidence":"Co-IP and bispecific antibody functional assays for TCR co-clustering; Ly108 siRNA in macrophages with NF-κB pathway and HCC co-culture assays","pmids":["36622343","35126725"],"confidence":"High","gaps":["Stoichiometry of SLAMF6–CD3 complex association not quantified","Whether SLAMF6-driven M2 polarization depends on SAP or SHP-1 not determined"]},{"year":2025,"claim":"The paradigm-shifting discovery that SLAMF6 engages in cis homophilic interactions on the T cell surface that are constitutively inhibitory—independently of tumor-expressed SLAMF6—and that disrupting these cis interactions with antibodies potently enhances anti-tumor immunity, while separately SLAMF6 expression on AML blasts was shown to mediate immune evasion reversible by dimerization-blocking antibodies, established SLAMF6 as a next-generation immune checkpoint target.","evidence":"Cis interaction assays, cis-blocking versus trans-blocking antibodies in vitro and in vivo tumor models; CRISPR KO of SLAMF6 in AML cells with dimerization-blocking antibody in humanized models; strain comparison of SLAMF6 expression and basal TCR signaling in thymocytes","pmids":["41673151","41044242","40405353"],"confidence":"High","gaps":["Structural basis distinguishing cis from trans homophilic interfaces not resolved","Whether cis-blocking antibodies affect normal immune homeostasis long-term unknown","Biomarkers predicting patient response to SLAMF6-targeted therapy not identified"]},{"year":null,"claim":"Key unresolved questions include the structural distinction between cis and trans SLAMF6 dimer interfaces, the quantitative competition kinetics of SAP versus SHP-1 at ITSMs in different immune cell subsets, the mechanism by which SLAMF6 activates neutrophil NADPH oxidase, and whether therapeutic targeting of SLAMF6 (blocking antibodies, splice-switching oligonucleotides) can achieve selective modulation without disrupting immune homeostasis.","evidence":"","pmids":[],"confidence":"High","gaps":["Atomic-resolution structure of cis dimer versus trans dimer not available","SAP/SHP-1 competition kinetics not measured quantitatively in any cell type","Mechanism linking SLAMF6 to neutrophil ROS production undefined","In vivo therapeutic window for SLAMF6-targeting agents not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1,2,4,6,10,16,29]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[10,14,16,23,29]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[1,3,21,31]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,3,9,21,24,29]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,1,4,6,10,15,16,17,20,28,29,30]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,4,8,13,14,21,23]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[1,3,14,19,21,24,29]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[6,12,25,32]}],"complexes":[],"partners":["SH2D1A","PTPN6","SH2D1B","FYN","LCK","VAV1","CBL"],"other_free_text":[]},"mechanistic_narrative":"SLAMF6 (NTB-A/Ly108) is a homophilic immunoglobulin superfamily receptor that functions as a molecular switch in NK cells, T cells, B cells, and myeloid cells, toggling between activating and inhibitory signaling depending on the availability of the adaptor SAP (SH2D1A) versus the phosphatase SHP-1. The receptor engages in both trans (cell–cell) and cis (same-cell) homophilic interactions through an end-to-end ectodomain dimer interface; trans engagement at the immunological synapse co-stimulates TCR signaling, promotes Rap1-dependent adhesion, and drives NKT cell lineage development and Tfh–GC B cell interactions via SAP/Fyn-dependent recruitment of Vav-1, c-Cbl, and LCK, whereas cis interactions on T cells are constitutively inhibitory and limit anti-tumor immunity [PMID:11489943, PMID:17045824, PMID:18031695, PMID:22683125, PMID:31199820, PMID:41673151]. When SAP is absent (as in X-linked lymphoproliferative disease), SHP-1 occupies the cytoplasmic ITSMs, converting SLAMF6 into an inhibitory receptor that dampens CD3ζ phosphorylation, T–B adhesion, and germinal center responses; SAP and SHP-1 thus compete at the ITSMs to set a signaling rheostat controlling humoral immunity, B cell tolerance, and autoimmunity [PMID:22683125, PMID:25217164, PMID:16778059]. Alternative splicing further tunes function: the short SLAMF6Δ17-65 isoform is agonistic and drives a TBX21/RUNX3 cytotoxic program that enhances anti-tumor TIL activity, while the Ly108-H1 isoform acts as an immune-suppressive decoy that restrains lupus-like autoimmunity [PMID:33762352, PMID:21422172]."},"prefetch_data":{"uniprot":{"accession":"Q96DU3","full_name":"SLAM family member 6","aliases":["Activating NK receptor","NK-T-B-antigen","NTB-A"],"length_aa":332,"mass_kda":37.3,"function":"Self-ligand receptor of the signaling lymphocytic activation molecule (SLAM) family. SLAM receptors triggered by homo- or heterotypic cell-cell interactions are modulating the activation and differentiation of a wide variety of immune cells and thus are involved in the regulation and interconnection of both innate and adaptive immune response. Activities are controlled by presence or absence of small cytoplasmic adapter proteins, SH2D1A/SAP and/or SH2D1B/EAT-2. Triggers cytolytic activity only in natural killer cells (NK) expressing high surface densities of natural cytotoxicity receptors (PubMed:11489943, PubMed:16920955). Positive signaling in NK cells implicates phosphorylation of VAV1. NK cell activation seems to depend on SH2D1B and not on SH2D1A (PubMed:16920955). In conjunction with SLAMF1 controls the transition between positive selection and the subsequent expansion and differentiation of the thymocytic natural killer T (NKT) cell lineage (By similarity). Promotes T-cell differentiation into a helper T-cell Th17 phenotype leading to increased IL-17 secretion; the costimulatory activity requires SH2D1A (PubMed:16920955, PubMed:22184727). Promotes recruitment of RORC to the IL-17 promoter (PubMed:22989874). In conjunction with SLAMF1 and CD84/SLAMF5 may be a negative regulator of the humoral immune response. In the absence of SH2D1A/SAP can transmit negative signals to CD4(+) T-cells and NKT cells. Negatively regulates germinal center formation by inhibiting T-cell:B-cell adhesion; the function probably implicates increased association with PTPN6/SHP-1 via ITSMs in absence of SH2D1A/SAP. However, reported to be involved in maintaining B-cell tolerance in germinal centers and in preventing autoimmunity (By similarity)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q96DU3/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SLAMF6","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/SLAMF6","total_profiled":1310},"omim":[{"mim_id":"606446","title":"SLAM FAMILY, MEMBER 6; SLAMF6","url":"https://www.omim.org/entry/606446"},{"mim_id":"604513","title":"CD84 ANTIGEN; CD84","url":"https://www.omim.org/entry/604513"},{"mim_id":"601744","title":"SYSTEMIC LUPUS ERYTHEMATOSUS, SUSCEPTIBILITY TO, 1; SLEB1","url":"https://www.omim.org/entry/601744"},{"mim_id":"308240","title":"LYMPHOPROLIFERATIVE SYNDROME, X-LINKED, 1; XLP1","url":"https://www.omim.org/entry/308240"},{"mim_id":"300490","title":"SH2 DOMAIN PROTEIN 1A; SH2D1A","url":"https://www.omim.org/entry/300490"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":57.7}],"url":"https://www.proteinatlas.org/search/SLAMF6"},"hgnc":{"alias_symbol":["KALI","NTBA","KALIb","Ly108","SF2000","NTB-A","CD352"],"prev_symbol":[]},"alphafold":{"accession":"Q96DU3","domains":[{"cath_id":"2.60.40.10","chopping":"21-128","consensus_level":"high","plddt":89.4956,"start":21,"end":128},{"cath_id":"2.60.40.10","chopping":"132-216","consensus_level":"high","plddt":91.4647,"start":132,"end":216}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96DU3","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96DU3-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96DU3-F1-predicted_aligned_error_v6.png","plddt_mean":77.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SLAMF6","jax_strain_url":"https://www.jax.org/strain/search?query=SLAMF6"},"sequence":{"accession":"Q96DU3","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96DU3.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96DU3/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96DU3"}},"corpus_meta":[{"pmid":"18031695","id":"PMC_18031695","title":"Homotypic interactions mediated by Slamf1 and Slamf6 receptors control NKT cell lineage development.","date":"2007","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/18031695","citation_count":287,"is_preprint":false},{"pmid":"11489943","id":"PMC_11489943","title":"NTB-A [correction of GNTB-A], a novel SH2D1A-associated surface molecule contributing to the inability of natural killer cells to kill Epstein-Barr virus-infected B cells in X-linked lymphoproliferative disease.","date":"2001","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/11489943","citation_count":256,"is_preprint":false},{"pmid":"16778059","id":"PMC_16778059","title":"Regulation of B cell tolerance by the lupus susceptibility gene Ly108.","date":"2006","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/16778059","citation_count":181,"is_preprint":false},{"pmid":"21075351","id":"PMC_21075351","title":"Degranulation of natural killer cells following interaction with HIV-1-infected cells is hindered by downmodulation of NTB-A by Vpu.","date":"2010","source":"Cell host & microbe","url":"https://pubmed.ncbi.nlm.nih.gov/21075351","citation_count":153,"is_preprint":false},{"pmid":"22683125","id":"PMC_22683125","title":"The receptor Ly108 functions as a SAP adaptor-dependent on-off switch for T cell help to B cells and NKT cell development.","date":"2012","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/22683125","citation_count":133,"is_preprint":false},{"pmid":"15162436","id":"PMC_15162436","title":"Homophilic interaction of NTBA, a member of the CD2 molecular family: induction of cytotoxicity and cytokine release in human NK cells.","date":"2004","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/15162436","citation_count":84,"is_preprint":false},{"pmid":"15081756","id":"PMC_15081756","title":"Cadmium uptake and translocation in tumbleweed (Salsola kali), a potential Cd-hyperaccumulator desert plant species: ICP/OES and XAS studies.","date":"2004","source":"Chemosphere","url":"https://pubmed.ncbi.nlm.nih.gov/15081756","citation_count":76,"is_preprint":false},{"pmid":"15879084","id":"PMC_15879084","title":"Cutting edge: the SLAM family receptor Ly108 controls T cell and neutrophil functions.","date":"2005","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/15879084","citation_count":65,"is_preprint":false},{"pmid":"15153464","id":"PMC_15153464","title":"Cutting edge: NTB-A activates NK cells via homophilic interaction.","date":"2004","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/15153464","citation_count":63,"is_preprint":false},{"pmid":"17045824","id":"PMC_17045824","title":"NTB-A receptor crystal structure: insights into homophilic interactions in the signaling lymphocytic activation molecule receptor 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isoform of the Ly108 gene ameliorates murine lupus.","date":"2011","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/21422172","citation_count":50,"is_preprint":false},{"pmid":"16410313","id":"PMC_16410313","title":"2B4 (CD244), NTB-A and CRACC (CS1) stimulate cytotoxicity but no proliferation in human NK cells.","date":"2006","source":"International immunology","url":"https://pubmed.ncbi.nlm.nih.gov/16410313","citation_count":47,"is_preprint":false},{"pmid":"23355739","id":"PMC_23355739","title":"A role for Ly108 in the induction of promyelocytic zinc finger transcription factor in developing thymocytes.","date":"2013","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/23355739","citation_count":46,"is_preprint":false},{"pmid":"16920955","id":"PMC_16920955","title":"Molecular analysis of NTB-A signaling: a role for EAT-2 in NTB-A-mediated activation of human NK cells.","date":"2006","source":"Journal of 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Co-immunoprecipitation, functional NK cell cytotoxicity assays with patient cells and mAb-masking experiments\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, patient cell functional assays, multiple orthogonal methods in single study\",\n      \"pmids\": [\"11489943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"NTB-A (SLAMF6) is its own ligand, engaging in homophilic interaction; this homophilic binding activates NK cell cytotoxicity, influences NK cell proliferation, and stimulates IFN-γ secretion.\",\n      \"method\": \"Recombinant trimeric NTB-A fusion proteins used as probes; functional NK cytotoxicity, proliferation, and cytokine assays; surface plasmon resonance and ELISA confirming homophilic binding\",\n      \"journal\": \"European journal of immunology / Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reconstituted homophilic binding with multiple binding assays plus functional validation, replicated across two labs (PMID 15162436 and 15153464)\",\n      \"pmids\": [\"15162436\", \"15153464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Cross-linking of NTB-A (SLAMF6) induces tyrosine phosphorylation of the receptor and recruitment of SAP; NTB-A co-stimulation with CD3 drives T cell proliferation, IFN-γ secretion, and Th1 differentiation; soluble NTB-A-Fc fusion protein blocks B cell isotype switching and delays experimental autoimmune encephalomyelitis in vivo.\",\n      \"method\": \"mAb cross-linking, phosphorylation assays, Co-IP, T cell differentiation assays, in vivo EAE model with soluble fusion protein blockade\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal in vitro and in vivo methods in single study\",\n      \"pmids\": [\"14988414\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Crystal structure of the NTB-A (SLAMF6) ectodomain solved at 3.0 Å reveals a rod-like monomer that self-associates into a highly kinked dimer via end-to-end homophilic interaction; structural comparison with CD2-CD58 identifies the molecular basis for binding specificity within the SLAM family.\",\n      \"method\": \"X-ray crystallography at 3.0 Å resolution\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — high-resolution crystal structure with functional interpretation\",\n      \"pmids\": [\"17045824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NTB-A (SLAMF6) is constitutively tyrosine phosphorylated in unstimulated NK cells by Src family kinases, likely due to homophilic NK-NK interactions; the second ITSM tyrosine (Y2) is essential for NTB-A-mediated cytotoxicity; EAT-2 (not SAP) is recruited to Y2 and is required for cytotoxicity, while SAP (not EAT-2) is required for NTB-A-mediated IFN-γ production, revealing differential adapter requirements for cytotoxicity vs. cytokine release.\",\n      \"method\": \"NTB-A-negative NK cell line reconstituted with cytoplasmic tail mutants; SAP knockdown; EAT-2 knockdown; cytotoxicity and IFN-γ production assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with mutagenesis plus genetic knockdown with defined phenotypic readouts\",\n      \"pmids\": [\"16920955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The Ly108.2 allele (normal), but not the lupus-associated Ly108.1 allele, sensitizes immature B cells to deletion and RAG re-expression, establishing Ly108 (SLAMF6) as a regulator of B cell tolerance checkpoints.\",\n      \"method\": \"Genetic analysis of congenic mouse strains, B cell functional assays (anergy, deletion, receptor revision)\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic comparison of allelic variants with multiple B cell tolerance readouts\",\n      \"pmids\": [\"16778059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Homophilic engagement of Slamf6 (Ly108) and Slamf1 on cortical thymocytes generates 'second signals' requiring SAP recruitment and Fyn kinase activation; these signals are essential for NKT cell lineage development and only occur during T-T (not T-stromal cell) interactions because stromal cells do not express Slamf6 or Slamf1.\",\n      \"method\": \"Targeted gene disruption (Slamf6 and Slamf1 knockout mice), genetic epistasis with SAP and Fyn mutants, NKT cell developmental assays\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple gene knockouts with epistasis, replicated in vivo developmental assay\",\n      \"pmids\": [\"18031695\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Ly108 (SLAMF6) controls neutrophil bactericidal activity: Ly108-deficient neutrophils have severely reduced reactive oxygen species production after bacterial phagocytosis and increased susceptibility to Salmonella typhimurium infection; Ly108 also regulates CD4+ T cell IL-4 production.\",\n      \"method\": \"Targeted disruption of Ly108 exons 2 and 3 in mice; in vitro and in vivo Salmonella infection assays; ROS measurement; cytokine assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined cellular and molecular phenotypes\",\n      \"pmids\": [\"15879084\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Ly108 (SLAMF6) mediates tyrosine phosphorylation signaling involving Vav-1 and c-Cbl in a manner strictly dependent on SAP expression and Fyn kinase; the lupus-associated Ly108-1 isoform triggers stronger tyrosine phosphorylation than Ly108-2 due to an additional unique intra-cytoplasmic tyrosine-based motif.\",\n      \"method\": \"In vitro phosphorylation assays, co-immunoprecipitation, comparison of T cells from SAP-deficient and FynT-mutant mice, isoform-specific signaling analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic backgrounds tested, SAP/Fyn epistasis, isoform comparison with mechanistic follow-up\",\n      \"pmids\": [\"18482989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HIV-1 Vpu downmodulates NTB-A (SLAMF6) surface expression on infected CD4+ T cells through its transmembrane region, retaining NTB-A within the Golgi by affecting glycosylation (only high-mannose form detectable), thereby preventing NK cell degranulation and protecting infected cells from NK-mediated lysis.\",\n      \"method\": \"Vpu mutant virus infection assays, NK cell degranulation assays, glycosylation analysis, co-immunoprecipitation of Vpu-NTB-A association\",\n      \"journal\": \"Cell host & microbe / Virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic delineation with Vpu mutants, glycosylation analysis, functional NK assays; replicated across two papers (PMID 21075351, 23528733)\",\n      \"pmids\": [\"21075351\", \"23528733\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Deletion of Ly108 (Slamf6) in SAP-deficient CD4+ T cells reverses the germinal center defect of Sh2d1a-/- mice; Ly108 negative signaling requires ITSMs and SHP-1 recruitment, generating high amounts of SHP-1 at the T cell:B cell synapse and limiting T:B adhesion; SAP and SHP-1 compete for Ly108 ITSM binding to act as a rheostat for T cell help.\",\n      \"method\": \"Genetic epistasis (Slamf6-/- crossed to Sh2d1a-/-), germinal center assays, SHP-1 recruitment assays at immunological synapse, ITSM mutant analysis\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean double KO epistasis with mechanistic molecular follow-up\",\n      \"pmids\": [\"22683125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Ly108 (SLAMF6) is constitutively tyrosine phosphorylated in murine thymus in a SAP- and Fyn kinase-dependent manner; phosphorylation is rapidly lost after thymocyte disaggregation indicating dynamic contact-mediated regulation; the Ly108-H1 isoform does not undergo tyrosine phosphorylation, suggesting it functions as a decoy isoform.\",\n      \"method\": \"Thymocyte phosphorylation assays, SAP and Fyn KO comparisons, isoform-specific phosphorylation analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic controls with mechanistic isoform comparison\",\n      \"pmids\": [\"22393150\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Ly108 (SLAMF6) co-stimulation of preselection double-positive thymocytes markedly enhances PLZF transcription factor expression compared to TCR stimulation alone; this occurs through increased Egr-2 expression and Egr-2 binding to the Zbtb16 (PLZF) promoter; Ly108-deficient mice have decreased PLZF-expressing CD4+ T cells.\",\n      \"method\": \"Chromatin immunoprecipitation (Egr-2 at Zbtb16 promoter), flow cytometry, Ly108 KO mouse analysis, co-stimulation assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP with KO validation and mechanistic pathway definition\",\n      \"pmids\": [\"23355739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SAP facilitates recruitment and activation of LCK (but not FYN) at NTB-A (SLAMF6) receptors in activated human T cells upon TCR restimulation; both ITSMs are required; NTB-A-associated LCK phosphorylation and kinase activity amplify proximal TCR signaling to promote restimulation-induced cell death (RICD); this is abrogated in XLP (SAP-deficient) T cells.\",\n      \"method\": \"Co-immunoprecipitation, kinase activity assays, SAP siRNA knockdown, comparison with XLP patient T cells, RICD assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP, kinase assays, patient cell validation, multiple orthogonal methods\",\n      \"pmids\": [\"24688028\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Ly108 (SLAMF6) dampens T cell adhesion to B cells and dendritic cells by inhibiting CD3ζ phosphorylation through two levels of regulated Ly108-CD3ζ interaction: (1) constitutive colocalization-dependent inhibition via SHP-1 associated with Ly108, and (2) ligation-dependent Ly108-CD3ζ interaction requiring the Ly108 transmembrane domain, leading to more efficient CD3ζ dephosphorylation.\",\n      \"method\": \"Co-immunoprecipitation of Ly108-CD3ζ, transmembrane domain swap mutants, proximity assays, T-B conjugation assays, phosphorylation measurements\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mechanistic mutant analysis with two distinct modes of Ly108-CD3ζ interaction defined\",\n      \"pmids\": [\"25217164\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"SLAMF6 deletion combined with SLAMF1 and SLAMF5 deletion results in enhanced T-dependent and T-independent antibody responses; both B and T cells from triple knockout mice contribute to enhanced responses; anti-SLAMF6 mAb treatment inhibits Tfh cell and GC B cell development, establishing SLAMF6 as a negative regulator of humoral immunity.\",\n      \"method\": \"Single and triple gene KO mice, adoptive co-transfer assays, anti-SLAMF6 mAb treatment, GC and Tfh cell analysis\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple genetic KO combinations plus adoptive transfer dissection of cell-intrinsic roles\",\n      \"pmids\": [\"25926831\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SLAMF6 on NK cells enhances NK cell activation against nonhematopoietic target cells (which lack SLAM ligands) through a mechanism regulated by SAP adaptors; SAP uncouples SLAMF6 from SHP-1, reducing the negative effect of SLAMF6 on NK responsiveness toward nonhematopoietic targets, defining a SLAM-SAP pathway that influences NK cell 'education'.\",\n      \"method\": \"SLAMF6 and SAP family knockout mice, NK cell activation assays against hematopoietic and nonhematopoietic targets, phosphatase association analysis\",\n      \"journal\": \"Nature immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO studies with mechanistic SAP/SHP-1 pathway definition\",\n      \"pmids\": [\"26878112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Transfer of Slamf6-/- CD4+ T cells induces SLE-like autoimmunity with elevated autoantibodies, Tfh cells, and GC B cells; the Slamf6-H1 isoform expressed in Slamf6-/- T cells does not cause this phenotype; Slamf1 is required for the pro-autoimmune effect of Slamf6 deficiency, placing SLAMF6 as an inhibitory receptor that controls autoimmune responses in cooperation with SLAMF1.\",\n      \"method\": \"Adoptive transfer of KO T cells into bm12 recipients, multi-receptor KO epistasis analysis, autoantibody measurement, Tfh/GC analysis\",\n      \"journal\": \"Clinical immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — epistasis between multiple SLAM KOs with in vivo autoimmunity readouts\",\n      \"pmids\": [\"27368806\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"SLAMF3 and SLAMF6 co-engagement with CD3 under Th17 polarizing conditions increases IL-17 production in a SAP-dependent manner; SLAM co-stimulation promotes RORγt recruitment to the IL17A promoter and increases nuclear NFAT1 occupancy; SLAMF6-driven IL-17 production is severely defective in SLE T cells.\",\n      \"method\": \"mAb co-stimulation assays, SAP-deficient controls, chromatin immunoprecipitation (RORγt and NFAT1 at IL17A promoter), cytokine ELISAs\",\n      \"journal\": \"Journal of immunology / The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — ChIP with mechanistic co-stimulation assays and SAP-dependency confirmed\",\n      \"pmids\": [\"22184727\", \"22989874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SLAMF6 homophilic interactions between naive T and B cells induce cell type-specific signals mediated by SAP adaptors, leading to upregulation of migration inhibitory factor (MIF) in T cells and augmented CD74 expression on B cells, consequently enhancing B cell survival; SAP deficiency in XLP patients reduces CD74 expression and perturbs naive B cell maintenance.\",\n      \"method\": \"Cell-cell interaction assays, SAP-deficient patient analysis, cytokine and receptor expression measurements, XLP patient B cell survival assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mechanistic signaling cascade defined with patient cell validation\",\n      \"pmids\": [\"28904129\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Trans Ly108 (SLAMF6) interactions between dendritic cells and iNKT cells are critical for robust iNKT cell activation; siRNA knockdown and peptide-blocking strategies specifically abrogated trans-Ly108-mediated co-stimulation; Ly108 co-stimulation similarly enhanced human iNKT cell activation.\",\n      \"method\": \"siRNA knockdown, peptide-blocking, functional iNKT activation assays in mice and human cells\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockdown plus blocking strategy with functional readouts in two species\",\n      \"pmids\": [\"28373584\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SLAMF6 clustering specifically with TCR at the immunological synapse dramatically increases downstream TCR signaling; tyrosine 308 in the SLAMF6 cytoplasmic tail is crucial for T cell function enhancement; the SLAMF6 ectodomain is required for function but not for synapse recruitment; SLAMF6 enhances T cell adhesiveness through activation of the small GTPase Rap1.\",\n      \"method\": \"Biochemical clustering assays, cytoplasmic tail tyrosine mutants, imaging studies of synapse localization, Rap1 activation assays, genetic SLAMF6 deletion\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis, imaging, and GTPase activation assays with multiple orthogonal approaches\",\n      \"pmids\": [\"31199820\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"NK cytotoxicity mediated by NTB-A (SLAMF6) via 2B4 is dependent on SAP acting downstream of receptor phosphorylation; SAP knockdown does not affect lipid raft recruitment or receptor phosphorylation, but abrogates EAT-2 recruitment to NTB-A, revealing novel cooperativity between SAP and EAT-2 adaptors.\",\n      \"method\": \"SAP knockdown in primary human NK cells, raft fractionation, phosphorylation assays, EAT-2 recruitment assays, cytotoxicity assays\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic knockdown with mechanistic dissection of signaling hierarchy\",\n      \"pmids\": [\"23346089\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The canonical SLAMF6 isoform inhibits T cell activation through SAP recruitment, while the short splice isoform SLAMF6Δ17-65 has a strong agonistic effect dependent on SHP-1; the costimulatory action of SLAMF6Δ17-65 leads to a cytotoxic molecular profile mediated by TBX21 and RUNX3 expression; splice-switching antisense oligonucleotides promoting SLAMF6Δ17-65 improved tumor-infiltrating lymphocyte anti-tumor function.\",\n      \"method\": \"Isoform expression, SAP and SHP-1 functional assays, transcription factor expression profiling, ASO-mediated splice switching, in vivo tumor model\",\n      \"journal\": \"Cancer immunology research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — isoform mechanistic dissection with SAP/SHP-1 dependency, in vivo validation\",\n      \"pmids\": [\"33762352\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SLAMF6 co-localization with the CD3 complex enhances T cell activity; co-immunoprecipitation revealed SLAMF6 interacts with proteins essential for TCR downstream signaling; bispecific anti-CD3/SLAMF6 antibodies promoting SLAMF6-CD3 clustering enhanced T cell activation, while anti-CD45/SLAMF6 antibodies inhibiting SLAMF6-TCR clustering also enhanced activation through steric hindrance.\",\n      \"method\": \"Co-immunoprecipitation, biochemical colocalization assays, bispecific antibody functional studies, co-culture assays\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP with multiple antibody-based functional tests defining SLAMF6 proximity to TCR complex\",\n      \"pmids\": [\"36622343\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"CRISPR-mediated triple knockout of SLAMF1, SLAMF5, and SLAMF6 worsens iNKT cell development defects seen in SLAMF6 single knockouts, supporting positive signaling roles for these receptors in iNKT development with potential redundancy; triple KO does not grossly affect conventional T or B cell development.\",\n      \"method\": \"Cas9/CRISPR triple gene disruption, flow cytometric analysis of lymphocyte development\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — triple KO with clear developmental epistasis readout\",\n      \"pmids\": [\"27258160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SLAMF6/Ly108 promotes macrophage M2 polarization in hepatocellular carcinoma; Ly108 siRNA silencing in macrophages suppresses M2 polarization and attenuates HCC cell migration and invasion by inhibiting the NF-κB pathway; the tumor microenvironment upregulates Ly108 expression in macrophages.\",\n      \"method\": \"siRNA knockdown of Ly108 in macrophages, M2 polarization marker assays (RT-qPCR), NF-κB pathway analysis, clonogenic and Transwell assays, murine HCC model\",\n      \"journal\": \"Oncology letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA KD with defined pathway, but single lab, moderate mechanistic depth\",\n      \"pmids\": [\"35126725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"NTB-A (SLAMF6) and 2B4 directly bind influenza hemagglutinin (HA) in a sialic acid-dependent manner and co-stimulate NK cell killing of influenza-infected cells; viral neuraminidase counteracts these interactions.\",\n      \"method\": \"Direct receptor-HA binding assays, sialylation-dependent binding identification, NK cytotoxicity assays, binding site mutagenesis\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct binding assays with sialic acid dependency and functional cytotoxicity validation\",\n      \"pmids\": [\"26919106\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SLAMF6 absence in CD8+ T cells skews toward an effector phenotype with T-bet as the dominant transcription factor and acquisition of effector-memory phenotype; SLAMF6-/- Pmel-1 T cells show improved polyfunctionality, superior tumor cytolysis, and lasting tumor regression upon adoptive transfer; LAG-3 is upregulated in SLAMF6-/- cells and combined LAG-3 blockade further improves anti-tumor response.\",\n      \"method\": \"SLAMF6-/- x Pmel-1 TCR transgenic mice, adoptive transfer melanoma model, transcription factor analysis, cytolysis assays\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean genetic KO in defined TCR transgenic model with in vivo tumor regression readout\",\n      \"pmids\": [\"32122464\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SLAMF6 is triggered in cis by homotypic interactions at the T cell surface; these cis interactions elicit inhibitory effects that suppress T cell activation and limit anti-tumor immunity independently of SLAMF6 expression on tumor cells; antibodies disrupting cis interactions strongly augment T cell activation and inhibit tumor growth in vivo.\",\n      \"method\": \"cis homotypic interaction assays, mAb blocking experiments, T cell activation assays, in vivo tumor models, comparison of cis vs. trans blocking antibodies\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — mechanistic delineation of cis vs. trans signaling with in vitro and in vivo validation; published in Nature\",\n      \"pmids\": [\"41673151\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Aberrant expression of SLAMF6 on primitive AML cells constitutes an immune evasion mechanism; SLAMF6 knockout in AML cells enables T cell activation and killing; an antibody targeting the SLAMF6 dimerization site inhibits SLAMF6-SLAMF6 homophilic interaction and restores T cell killing both in vitro and in humanized in vivo models.\",\n      \"method\": \"CRISPR KO of SLAMF6 in AML cells, T cell coculture cytotoxicity assays, dimerization-blocking antibody, humanized in vivo AML models\",\n      \"journal\": \"Nature cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR KO plus mechanistic antibody targeting of dimerization interface with in vivo validation\",\n      \"pmids\": [\"41044242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SLAMF6 blockade impairs actin ring formation at the immunological synapse between HIV-specific CTLs and HIV-infected CD4+ T cells, reducing CD8+-CD4+ T cell conjugate formation and killing efficiency of HIV-specific CTLs.\",\n      \"method\": \"Anti-SLAMF6 blocking antibody, conjugate formation assays, immunological synapse imaging (actin ring), CTL killing assays with PLWH-derived CTL lines\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — functional blocking with synapse imaging, but preprint only\",\n      \"pmids\": [\"39896504\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"SLAMF6 expression level on immature thymocytes affects basal TCR signaling in preselected double-positive thymocytes; low SLAMF6 expression (as in BALB/c mice) results in high basal TCR signaling, associated with iNKT2 cell expansion; this reveals SLAMF6 as a regulator of basal TCR signaling influencing iNKT lineage diversity.\",\n      \"method\": \"Strain comparison (BALB/c vs B6), SLAMF6 expression measurement, basal TCR signaling assays in preselected DP thymocytes, iNKT subset analysis\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — correlative strain comparison with mechanistic TCR signaling assays, single lab\",\n      \"pmids\": [\"40405353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Soluble SLAMF6 ectodomain (seSLAMF6, 203 aa) reduces activation-induced cell death in tumor-infiltrating lymphocytes, enhances IFN-γ secretion and cytolytic activity of CD8+ T cells, and expedites the loss of phosphorylation on SLAMF6 following TCR triggering; systemic administration sustains adoptively transferred CD8+ T cells in vivo and induces tumor clearance.\",\n      \"method\": \"Recombinant ectodomain protein, AICD assays, cytokine ELISA, phosphorylation assays, in vivo adoptive transfer tumor model\",\n      \"journal\": \"Cancer immunology research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reconstituted ectodomain with mechanistic phosphorylation readout and in vivo efficacy\",\n      \"pmids\": [\"29305520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"A novel isoform, Ly108-H1, is absent in lupus-prone congenic mice but present in C57BL/6 mice; transgenic expression of Ly108-H1 in B6.Sle1b mice markedly diminishes T cell-dependent autoimmunity, establishing the H1 isoform as an immune-suppressing variant of Ly108.\",\n      \"method\": \"Transgenic mouse generation, autoantibody measurement, T cell-dependent autoimmunity assays in congenic lupus model\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — transgenic rescue experiment with clean autoimmune phenotype readout\",\n      \"pmids\": [\"21422172\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"B cell-intrinsic expression of lupus-associated CD84 and Ly108 (SLAMF6) in germinal center B cells is sufficient to break B cell tolerance and increase autoantibody production; B6.Sle1b B cells have reduced BCR signaling and lower frequency of B-T cell conjugates compared to B6 controls overexpressing B6 Ly108; Ly108 modulates B cell tolerance at the GC checkpoint.\",\n      \"method\": \"BAC-transgenic mice overexpressing B6 Ly108 and CD84, GC analysis, BCR signaling assays, B-T cell conjugate frequency, autoantibody measurement\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — transgenic overexpression with B cell-specific dissection of GC tolerance mechanism\",\n      \"pmids\": [\"25801429\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SLAMF6 (Ly108/NTB-A) is a homophilic receptor of the immunoglobulin superfamily that engages in both cis (same-cell, inhibitory) and trans (cell-cell, context-dependent activating or inhibitory) homotypic interactions; its cytoplasmic ITSMs recruit either SAP—which recruits Fyn kinase and LCK to amplify downstream signaling and displace the inhibitory phosphatase SHP-1—or SHP-1 directly when SAP is absent, thereby functioning as a molecular switch between activating and inhibitory signals in NK cells, T cells, and B cells; it is essential for NKT cell lineage development via SAP/Fyn-dependent co-stimulation during T-T thymic interactions, regulates T follicular helper:GC B cell interactions and humoral immunity, and controls neutrophil bactericidal ROS production, with its balance between isoforms and adaptor availability critically influencing autoimmunity and anti-tumor immunity.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"SLAMF6 (NTB-A/Ly108) is a homophilic immunoglobulin superfamily receptor that functions as a molecular switch in NK cells, T cells, B cells, and myeloid cells, toggling between activating and inhibitory signaling depending on the availability of the adaptor SAP (SH2D1A) versus the phosphatase SHP-1. The receptor engages in both trans (cell–cell) and cis (same-cell) homophilic interactions through an end-to-end ectodomain dimer interface; trans engagement at the immunological synapse co-stimulates TCR signaling, promotes Rap1-dependent adhesion, and drives NKT cell lineage development and Tfh–GC B cell interactions via SAP/Fyn-dependent recruitment of Vav-1, c-Cbl, and LCK, whereas cis interactions on T cells are constitutively inhibitory and limit anti-tumor immunity [PMID:11489943, PMID:17045824, PMID:18031695, PMID:22683125, PMID:31199820, PMID:41673151]. When SAP is absent (as in X-linked lymphoproliferative disease), SHP-1 occupies the cytoplasmic ITSMs, converting SLAMF6 into an inhibitory receptor that dampens CD3ζ phosphorylation, T–B adhesion, and germinal center responses; SAP and SHP-1 thus compete at the ITSMs to set a signaling rheostat controlling humoral immunity, B cell tolerance, and autoimmunity [PMID:22683125, PMID:25217164, PMID:16778059]. Alternative splicing further tunes function: the short SLAMF6Δ17-65 isoform is agonistic and drives a TBX21/RUNX3 cytotoxic program that enhances anti-tumor TIL activity, while the Ly108-H1 isoform acts as an immune-suppressive decoy that restrains lupus-like autoimmunity [PMID:33762352, PMID:21422172].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of NTB-A as an NK-cell receptor whose signaling output—activating or inhibitory—depends on the presence of SAP resolved why XLP patients have defective NK cytotoxicity and established SLAMF6 as a SAP-dependent signaling switch.\",\n      \"evidence\": \"Molecular cloning, co-immunoprecipitation of SAP and SHPs, functional NK cytotoxicity assays with XLP patient cells\",\n      \"pmids\": [\"11489943\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream effectors beyond SAP/SHP association not yet defined\", \"Ligand identity unknown at this point\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstration that SLAMF6 is its own ligand and co-stimulates T cell proliferation, Th1 differentiation, and B cell isotype switching established the receptor as a homophilic co-stimulatory molecule operating in both innate and adaptive immunity.\",\n      \"evidence\": \"Recombinant trimeric NTB-A fusion proteins for homophilic binding (SPR, ELISA), T cell co-stimulation assays, in vivo EAE blockade with soluble NTB-A-Fc\",\n      \"pmids\": [\"15162436\", \"15153464\", \"14988414\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of homophilic interaction unresolved\", \"Relative contribution to T versus NK biology unclear\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Ly108 knockout mice revealed an unexpected non-lymphocyte role: SLAMF6 controls neutrophil bactericidal ROS production and host defense against Salmonella, broadening the receptor's functional scope beyond NK and T cells.\",\n      \"evidence\": \"Targeted Ly108 disruption in mice, in vitro and in vivo Salmonella infection, ROS measurement\",\n      \"pmids\": [\"15879084\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking SLAMF6 to NADPH oxidase activation not defined\", \"Whether SAP adaptors mediate the neutrophil phenotype unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"The crystal structure of the NTB-A ectodomain at 3.0 Å revealed a rod-like monomer self-associating into a kinked dimer, providing the molecular basis for homophilic specificity within the SLAM family, while mutagenesis of cytoplasmic ITSMs and adaptor knockdown dissected differential EAT-2 (cytotoxicity) versus SAP (IFN-γ) requirements and identified the lupus-associated Ly108.1 allele as a regulator of B cell tolerance checkpoints.\",\n      \"evidence\": \"X-ray crystallography; reconstitution of NTB-A tail mutants in NK cells with SAP/EAT-2 knockdown; genetic analysis of congenic lupus-prone mouse strains with B cell tolerance assays\",\n      \"pmids\": [\"17045824\", \"16920955\", \"16778059\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural determinants of adaptor selectivity at ITSM not resolved at atomic level\", \"How allelic variants differentially engage downstream signaling in B cells mechanistically unclear\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Genetic epistasis in Slamf6/Slamf1 double-KO, SAP-KO, and Fyn-KO mice established that SLAMF6 homophilic engagement during thymocyte–thymocyte interactions provides SAP/Fyn-dependent co-stimulation essential for NKT cell lineage commitment.\",\n      \"evidence\": \"Single and compound gene knockouts with NKT cell developmental analysis in thymus\",\n      \"pmids\": [\"18031695\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SLAMF6 acts at selection or expansion stage of NKT development not resolved\", \"Transcription factor targets downstream of SAP/Fyn in NKT lineage unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Signaling biochemistry downstream of Ly108 was mapped: SAP- and Fyn-dependent phosphorylation of Vav-1 and c-Cbl, with the lupus-associated Ly108-1 isoform triggering stronger signaling due to an additional cytoplasmic tyrosine, providing a molecular explanation for allelic autoimmune susceptibility.\",\n      \"evidence\": \"Phosphorylation assays and co-IP in T cells from SAP-KO and Fyn-mutant mice, isoform comparison\",\n      \"pmids\": [\"18482989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative contribution of Vav-1 versus c-Cbl to downstream phenotypes unknown\", \"Isoform-specific interactomes not comprehensively mapped\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"HIV-1 Vpu was shown to retain NTB-A in the Golgi by preventing glycosylation maturation, thereby shielding infected cells from NK-mediated killing, establishing SLAMF6 as a target of viral immune evasion.\",\n      \"evidence\": \"Vpu mutant virus infection, glycosylation analysis, NK degranulation assays, co-IP of Vpu–NTB-A\",\n      \"pmids\": [\"21075351\", \"23528733\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Precise Vpu–NTB-A binding interface unknown\", \"Whether other SLAM family members are similarly targeted not addressed\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Discovery that the Ly108-H1 isoform suppresses autoimmunity when transgenically expressed in lupus-prone mice, and that SLAMF6 co-stimulation promotes IL-17 production via RORγt and NFAT1 recruitment to the IL17A promoter, revealed isoform-specific and SAP-dependent control of T helper differentiation pathways.\",\n      \"evidence\": \"Transgenic Ly108-H1 mice in B6.Sle1b background; ChIP for RORγt and NFAT1 at IL17A promoter; SAP-deficient controls\",\n      \"pmids\": [\"21422172\", \"22184727\", \"22989874\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How Ly108-H1 mechanistically suppresses signaling (decoy versus active inhibition) unclear\", \"Whether SLAMF6-driven Th17 effect is cell-autonomous not fully resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The SAP-SHP-1 rheostat model was established: deletion of Ly108 in SAP-deficient mice rescued germinal center responses by removing the SHP-1-recruiting inhibitory signal, proving that SLAMF6 ITSMs serve as a competitive binding platform where SAP and SHP-1 antagonize each other to regulate T cell help to B cells.\",\n      \"evidence\": \"Slamf6−/− × Sh2d1a−/− double-KO epistasis, SHP-1 recruitment imaging at immunological synapse, ITSM mutant analysis\",\n      \"pmids\": [\"22683125\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative kinetics of SAP versus SHP-1 competition at the ITSM not measured\", \"Whether phosphatase SHP-2 also participates in this rheostat not tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"SLAMF6 was linked to transcriptional programming of innate-like T cells: co-stimulation of preselection thymocytes enhanced PLZF expression through Egr-2 binding to the Zbtb16 promoter, while SAP was shown to be required upstream of EAT-2 recruitment to NTB-A for NK cytotoxicity, defining an adaptor hierarchy.\",\n      \"evidence\": \"ChIP for Egr-2 at Zbtb16 promoter, Ly108-KO thymocyte analysis; SAP knockdown in NK cells with EAT-2 recruitment assays\",\n      \"pmids\": [\"23355739\", \"23346089\", \"22393150\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Egr-2–PLZF axis is exclusive to Ly108 or shared with other SLAM receptors unknown\", \"How phosphorylation-incompetent Ly108-H1 exerts its effects in thymus not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Two mechanistic refinements emerged: SAP recruits LCK (not Fyn) to NTB-A in activated human T cells to amplify proximal TCR signaling and promote restimulation-induced cell death, and Ly108 dampens T–B adhesion through a two-level CD3ζ dephosphorylation mechanism involving constitutive SHP-1 colocalization and ligation-dependent transmembrane domain interaction.\",\n      \"evidence\": \"Co-IP and kinase activity assays with XLP patient T cells; Ly108 transmembrane swap mutants with T–B conjugation assays\",\n      \"pmids\": [\"24688028\", \"25217164\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether LCK recruitment occurs in all T cell subsets or only restimulated cells unclear\", \"Structural basis of transmembrane domain-mediated Ly108–CD3ζ interaction unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"SLAMF6 was established as a negative regulator of humoral immunity: anti-SLAMF6 mAb treatment inhibited Tfh and GC B cell development, and B cell-intrinsic Ly108 expression modulated GC tolerance, BCR signaling strength, and autoantibody production.\",\n      \"evidence\": \"Single and triple SLAM KO mice, adoptive transfer, anti-SLAMF6 mAb in vivo; BAC-transgenic Ly108 overexpression with GC and BCR signaling analysis\",\n      \"pmids\": [\"25926831\", \"25801429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether SLAMF6 inhibits Tfh through cis or trans interactions not distinguished\", \"Downstream phosphatase versus adaptor usage in GC B cells not defined\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Multiple studies converged to show SLAMF6 tunes NK education (SAP uncouples SLAMF6 from SHP-1 to allow NK responsiveness toward non-hematopoietic targets), cooperates with SLAMF1 to restrain autoimmunity, and worsens iNKT developmental defects when deleted in combination with other SLAM receptors.\",\n      \"evidence\": \"SLAMF6-KO and SAP-KO NK assays against hematopoietic and non-hematopoietic targets; Slamf6-KO T cell adoptive transfer autoimmunity; CRISPR triple-KO iNKT analysis\",\n      \"pmids\": [\"26878112\", \"27368806\", \"27258160\", \"26919106\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of NK 'education' by SLAMF6–SHP-1 not fully elucidated\", \"Whether SLAMF6 binding to influenza HA has physiological relevance in vivo unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"SLAMF6 homophilic trans interactions between T and B cells were shown to induce cell-type-specific downstream programs—MIF secretion in T cells and CD74 upregulation in B cells promoting B cell survival—and SLAMF6 trans engagement on dendritic cells was required for optimal iNKT cell activation.\",\n      \"evidence\": \"T–B cell interaction assays with XLP patient cells; siRNA and peptide-blocking of Ly108 in DC–iNKT co-cultures\",\n      \"pmids\": [\"28904129\", \"28373584\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MIF–CD74 axis is the primary B cell survival pathway downstream of SLAMF6 not confirmed by genetic rescue\", \"Signaling cascade linking Ly108 engagement on DCs to iNKT activation not mapped\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A soluble SLAMF6 ectodomain was shown to enhance TIL function by reducing activation-induced cell death and accelerating SLAMF6 dephosphorylation, providing the first therapeutic proof-of-concept for modulating SLAMF6 signaling to boost anti-tumor immunity.\",\n      \"evidence\": \"Recombinant ectodomain protein, AICD and phosphorylation assays, in vivo adoptive transfer tumor model\",\n      \"pmids\": [\"29305520\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether soluble ectodomain disrupts cis or trans interactions selectively not determined\", \"Pharmacokinetics and target engagement in vivo not characterized\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"SLAMF6 clustering with the TCR at the immunological synapse was shown to amplify downstream signaling through Rap1 GTPase activation, with tyrosine 308 in the cytoplasmic tail critical for this effect, providing a spatial mechanism for SLAMF6 co-stimulation.\",\n      \"evidence\": \"Biochemical clustering and Rap1 activation assays, cytoplasmic tail Y308 mutants, synapse imaging\",\n      \"pmids\": [\"31199820\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GEF linking SLAMF6 to Rap1 activation not identified\", \"Whether Y308-dependent signaling is SAP-dependent or independent not tested\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"SLAMF6 deletion in CD8+ T cells skewed toward a T-bet-dominant effector phenotype with enhanced polyfunctionality and lasting tumor regression, identifying SLAMF6 as an inhibitory checkpoint whose absence improves adoptive cell therapy; LAG-3 upregulation was identified as a compensatory mechanism.\",\n      \"evidence\": \"SLAMF6−/− × Pmel-1 TCR transgenic mice, adoptive transfer melanoma model, transcription factor and cytolysis analysis\",\n      \"pmids\": [\"32122464\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the effector skewing is due to loss of cis or trans SLAMF6 engagement not determined at this time\", \"Interaction between SLAMF6 and other checkpoint receptors beyond LAG-3 not explored\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Isoform-level dissection revealed that canonical SLAMF6 is inhibitory through SAP, while the SLAMF6Δ17-65 splice variant is agonistic through SHP-1 and drives a TBX21/RUNX3 cytotoxic program; splice-switching antisense oligonucleotides promoting this isoform improved anti-tumor TIL function, opening a new therapeutic modality.\",\n      \"evidence\": \"Isoform functional assays, SAP and SHP-1 dependency analysis, ASO-mediated splice switching in TILs, in vivo tumor model\",\n      \"pmids\": [\"33762352\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of SLAMF6Δ17-65 ectodomain and how deletion alters homophilic binding unknown\", \"Whether the short isoform engages in cis or only trans interactions not tested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Bispecific antibody studies confirmed that SLAMF6 physical proximity to the CD3 complex is functionally important—forcing co-clustering enhanced T cell activation—while a separate study showed SLAMF6 promotes macrophage M2 polarization in hepatocellular carcinoma through NF-κB, extending SLAMF6 function into tumor-associated macrophage biology.\",\n      \"evidence\": \"Co-IP and bispecific antibody functional assays for TCR co-clustering; Ly108 siRNA in macrophages with NF-κB pathway and HCC co-culture assays\",\n      \"pmids\": [\"36622343\", \"35126725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of SLAMF6–CD3 complex association not quantified\", \"Whether SLAMF6-driven M2 polarization depends on SAP or SHP-1 not determined\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"The paradigm-shifting discovery that SLAMF6 engages in cis homophilic interactions on the T cell surface that are constitutively inhibitory—independently of tumor-expressed SLAMF6—and that disrupting these cis interactions with antibodies potently enhances anti-tumor immunity, while separately SLAMF6 expression on AML blasts was shown to mediate immune evasion reversible by dimerization-blocking antibodies, established SLAMF6 as a next-generation immune checkpoint target.\",\n      \"evidence\": \"Cis interaction assays, cis-blocking versus trans-blocking antibodies in vitro and in vivo tumor models; CRISPR KO of SLAMF6 in AML cells with dimerization-blocking antibody in humanized models; strain comparison of SLAMF6 expression and basal TCR signaling in thymocytes\",\n      \"pmids\": [\"41673151\", \"41044242\", \"40405353\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis distinguishing cis from trans homophilic interfaces not resolved\", \"Whether cis-blocking antibodies affect normal immune homeostasis long-term unknown\", \"Biomarkers predicting patient response to SLAMF6-targeted therapy not identified\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural distinction between cis and trans SLAMF6 dimer interfaces, the quantitative competition kinetics of SAP versus SHP-1 at ITSMs in different immune cell subsets, the mechanism by which SLAMF6 activates neutrophil NADPH oxidase, and whether therapeutic targeting of SLAMF6 (blocking antibodies, splice-switching oligonucleotides) can achieve selective modulation without disrupting immune homeostasis.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Atomic-resolution structure of cis dimer versus trans dimer not available\", \"SAP/SHP-1 competition kinetics not measured quantitatively in any cell type\", \"Mechanism linking SLAMF6 to neutrophil ROS production undefined\", \"In vivo therapeutic window for SLAMF6-targeting agents not established\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1, 2, 4, 6, 10, 16, 29]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [10, 14, 16, 23, 29]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [1, 3, 21, 31]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 3, 9, 21, 24, 29]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 4, 6, 10, 15, 16, 17, 20, 28, 29, 30]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 4, 8, 13, 14, 21, 23]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [1, 3, 14, 19, 21, 24, 29]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [6, 12, 25, 32]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"SH2D1A\",\n      \"PTPN6\",\n      \"SH2D1B\",\n      \"FYN\",\n      \"LCK\",\n      \"VAV1\",\n      \"CBL\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}