{"gene":"GCSAM","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2003,"finding":"HGAL (GCET2) encodes a 178-amino acid cytoplasmic protein containing an immunoreceptor tyrosine-based activation motif (ITAM), and its expression in B cells is specifically induced by interleukin-4 (IL-4).","method":"Gene cloning, sequence analysis, IL-4 stimulation of B cells with expression measurement","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cloning with functional stimulation assay (IL-4 induction), single lab, two methods (sequence analysis + expression assay)","pmids":["12509382"],"is_preprint":false},{"year":2007,"finding":"GCET2/HGAL localizes constitutively to the plasma membrane (but excluded from lipid rafts) via myristoylation and palmitoylation; it can be phosphorylated at its third (Y107, within YENV motif) and fourth tyrosines by LYN, LCK, or SYK kinases; and phosphorylated GCET2 associates with the adaptor protein GRB2 through the Y107 (YENV) site.","method":"Serial tyrosine mutagenesis, co-transfection with PTKs in COS7 cells, co-immunoprecipitation with GRB2, cell fractionation/membrane localization assays","journal":"British journal of haematology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (mutagenesis, co-IP, fractionation), single lab but rigorous mechanistic dissection","pmids":["17489982"],"is_preprint":false},{"year":2010,"finding":"HGAL activates the RhoA signaling pathway by directly binding to the catalytic DH-domain of RhoA-specific guanine nucleotide exchange factors PDZ-RhoGEF and LARG, stimulating GDP-GTP exchange on RhoA, thereby inhibiting lymphoma cell motility.","method":"Co-immunoprecipitation, in vitro RhoA GEF activity assay, domain mapping/mutagenesis, cell motility assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro biochemical GEF activity assay combined with domain mapping and functional cell motility readout, single lab with multiple orthogonal methods","pmids":["20844236"],"is_preprint":false},{"year":2011,"finding":"miR-155 directly downregulates HGAL expression by binding to the 3'-UTR of HGAL mRNA, leading to decreased RhoA activation and increased lymphoma cell motility; re-expression of HGAL lacking the miR-155 binding site rescues RhoA activation and motility inhibition.","method":"miR-155 binding site reporter assay, HGAL 3'-UTR mutagenesis, RhoA activity assay, cell motility assay","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct rescue experiment with binding-site mutant plus functional readouts (RhoA, motility), multiple orthogonal methods in one study","pmids":["22096245"],"is_preprint":false},{"year":2011,"finding":"The transcription repressor PRDM1/Blimp1 directly binds to recognition sites in the upstream promoters of HGAL and suppresses HGAL mRNA and protein expression, providing a mechanism for loss of HGAL expression during GC B-cell to plasma cell differentiation.","method":"Chromatin immunoprecipitation (ChIP), promoter-reporter assay, PRDM1 overexpression with mRNA/protein level measurement","journal":"The FEBS journal","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — ChIP demonstrating direct promoter binding plus functional promoter-reporter assay and endogenous protein/mRNA measurement, single lab with multiple orthogonal methods","pmids":["21722313"],"is_preprint":false},{"year":2013,"finding":"HGAL directly binds to Syk in B cells and increases Syk kinase activity upon B-cell receptor (BCR) stimulation, leading to enhanced activation of Syk downstream effectors and increased RhoA activation; in vivo, HGAL transgenic mice develop polyclonal B-cell lymphoid hyperplasia with elevated Syk phosphorylation.","method":"Co-immunoprecipitation, Syk kinase activity assay, HGAL transgenic mouse generation, ex vivo B-cell proliferation assay, phospho-Syk western blot","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay plus co-IP plus in vivo transgenic model with multiple readouts, corroborated by independent studies","pmids":["23299888"],"is_preprint":false},{"year":2014,"finding":"HGAL is myristoylated and palmitoylated, targeting it to membrane raft microdomains; raft localization facilitates interaction with Syk and enhances BCR signaling (with BCR stimulation inducing HGAL phosphorylation and redistribution from lipid raft to bulk membrane/cytoplasm followed by degradation), whereas membrane localization abrogates HGAL's inhibitory effects on chemoattractant-induced cell motility.","method":"Lipid modification assays (myristoylation/palmitoylation), membrane fractionation, co-immunoprecipitation, live-cell imaging, cell motility assays, BCR stimulation assays","journal":"Blood","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods including biochemical lipid modification assays, fractionation, co-IP, and functional motility/signaling readouts in a single rigorous study","pmids":["25381061"],"is_preprint":false},{"year":2019,"finding":"BCR stimulation induces rapid palmitoylation of the SCF-FBXO10 ubiquitin E3 ligase, causing its relocalization to the cell membrane where it ubiquitylates and degrades HGAL; FBXO10 recognition of HGAL is phosphorylation-independent and requires a single conserved HGAL residue (H91) and FBXO10 membrane relocalization; HGAL degradation decreases BCR-induced calcium influx and phosphorylation of proximal BCR effectors.","method":"Palmitoylation assay, ubiquitylation assay, site-directed mutagenesis (H91), subcellular fractionation, calcium flux assay, phospho-western blot","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — mutagenesis of critical residue, biochemical ubiquitylation assay, functional calcium flux readout, and spatial relocalization demonstrated with multiple orthogonal methods","pmids":["31570756"],"is_preprint":false},{"year":2019,"finding":"HGAL is phosphorylated by Syk and Lyn kinases at tyrosines Y80, Y86, Y106/Y107, Y128, and Y148; phosphorylated HGAL directly interacts with Grb2 via the YEN motif (Y107); HGAL, Grb2, and Syk form a trimeric complex; HGAL-Grb2 interaction is required for HGAL localization to the central supramolecular activation cluster (cSMAC) upon BCR activation and modulates the rate and intensity of BCR accumulation at the cSMAC.","method":"Phosphorylation mapping (mass spectrometry/mutagenesis), co-immunoprecipitation, biochemical binding assays (NMR/isothermal titration calorimetry implied by 'molecular methodologies'), confocal microscopy of BCR synapse, HGAL mutant rescue experiments","journal":"Blood advances","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — site mutagenesis, co-IP, biochemical interaction assays, and functional microscopy-based synapse readout in single study with multiple orthogonal methods","pmids":["31362927"],"is_preprint":false},{"year":2021,"finding":"HGAL interacts with tubulin (identified by unbiased proteomics) in addition to previously known cytoskeletal partners, and this interaction contributes to regulation of cell motility; in novel in vivo DLBCL dissemination models, HGAL expression decreases lymphoma dissemination and prolongs survival.","method":"Unbiased proteomic pulldown (mass spectrometry), co-immunoprecipitation with tubulin, in vivo xenograft/animal dissemination models, survival analysis","journal":"Blood advances","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — proteomics-identified interaction confirmed by co-IP, plus in vivo functional model, but tubulin interaction is a newer finding with limited follow-up","pmids":["34543391"],"is_preprint":false},{"year":2021,"finding":"Constitutive enforced expression of HGAL in vivo (in hematopoietic stem cells, pro-B cells, or GC B cells via Cre-mediated approaches) leads to development of GC B-cell type DLBCL in mice, demonstrating that deregulated HGAL expression contributes to lymphomagenesis.","method":"Conditional transgenic mouse models (3 Cre-mediated approaches), immunohistochemistry, exon sequencing of tumors","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Strong — three independent conditional transgenic mouse strains all develop DLBCL, with genomic validation by exon sequencing","pmids":["33024996"],"is_preprint":false}],"current_model":"HGAL/GCET2 is a GC B-cell-specific adaptor protein that localizes to plasma membrane raft microdomains via myristoylation and palmitoylation; at the membrane it directly binds and activates Syk kinase upon BCR stimulation, recruits Grb2 (via its phospho-Y107 YEN motif, phosphorylated by Syk/Lyn) to promote cSMAC formation, and activates RhoA signaling by binding to the DH-domain of PDZ-RhoGEF/LARG GEFs, thereby inhibiting cell motility; BCR-stimulated palmitoylation of FBXO10 drives its membrane relocalization where it ubiquitylates and degrades HGAL (dependent on HGAL residue H91) as a negative feedback mechanism; HGAL expression is transcriptionally induced by IL-4, repressed by PRDM1/Blimp1, and post-transcriptionally suppressed by miR-155, while constitutive HGAL expression in vivo promotes lymphoid hyperplasia and DLBCL development."},"narrative":{"mechanistic_narrative":"GCSAM (HGAL/GCET2) is a germinal-center B-cell-specific cytoplasmic adaptor protein that integrates B-cell receptor (BCR) signaling with cytoskeletal regulation to control B-cell activation and motility [PMID:12509382, PMID:23299888]. It is targeted to plasma membrane raft microdomains by myristoylation and palmitoylation, where lipid modification positions it to interact with Syk and amplify BCR signaling [PMID:17489982, PMID:25381061]. Upon BCR engagement, HGAL directly binds and increases the kinase activity of Syk, and is itself phosphorylated by Syk and Lyn at multiple tyrosines; phospho-Y107 within its YEN motif recruits Grb2, forming an HGAL–Grb2–Syk trimeric complex required for HGAL localization to the central supramolecular activation cluster (cSMAC) and for tuning BCR accumulation at the immune synapse [PMID:23299888, PMID:31362927]. In parallel, HGAL restrains cell motility by binding the catalytic DH-domain of the RhoA-specific GEFs PDZ-RhoGEF and LARG, stimulating GDP-GTP exchange on RhoA, and by interacting with tubulin [PMID:20844236, PMID:34543391]. HGAL abundance is tightly controlled: its expression is induced by IL-4 [PMID:12509382], transcriptionally repressed by PRDM1/Blimp1 during the GC-to-plasma-cell transition [PMID:21722313], post-transcriptionally suppressed by miR-155 [PMID:22096245], and degraded through BCR-induced palmitoylation and membrane relocalization of the SCF–FBXO10 E3 ligase, which ubiquitylates HGAL via its H91 residue as a negative-feedback brake on proximal BCR signaling [PMID:31570756]. Deregulated, constitutive HGAL expression in vivo drives polyclonal B-cell lymphoid hyperplasia and germinal-center-type diffuse large B-cell lymphoma, while HGAL expression also suppresses lymphoma dissemination and prolongs survival [PMID:23299888, PMID:34543391, PMID:33024996].","teleology":[{"year":2003,"claim":"Established HGAL as a GC B-cell-associated cytoplasmic protein bearing an ITAM and regulated by cytokine input, identifying it as a candidate signaling adaptor.","evidence":"Gene cloning, sequence analysis, and IL-4 stimulation of B cells with expression measurement","pmids":["12509382"],"confidence":"Medium","gaps":["No binding partner or downstream effector identified at this stage","ITAM functional phosphorylation not demonstrated","Subcellular localization not resolved"]},{"year":2007,"claim":"Defined HGAL's membrane targeting and first signaling linkage by showing lipid-modification-dependent plasma membrane localization, tyrosine phosphorylation by Lyn/Lck/Syk, and Grb2 recruitment via the Y107 YENV site.","evidence":"Serial tyrosine mutagenesis, co-transfection with PTKs in COS7, co-IP with GRB2, and cell fractionation","pmids":["17489982"],"confidence":"High","gaps":["Functional consequence of Grb2 recruitment unresolved","Whether kinase phosphorylation occurs in BCR-stimulated B cells not tested","Initial report placed HGAL outside rafts, later refined"]},{"year":2010,"claim":"Connected HGAL to RhoA signaling and cell motility by demonstrating direct binding to the DH-domains of PDZ-RhoGEF and LARG and stimulation of RhoA nucleotide exchange.","evidence":"Co-IP, in vitro RhoA GEF activity assay, domain mapping, and lymphoma cell motility assays","pmids":["20844236"],"confidence":"High","gaps":["How HGAL physically couples GEF activation to motility output not fully resolved","Relationship between RhoA arm and BCR-proximal signaling unclear at this stage"]},{"year":2011,"claim":"Identified two independent upstream control layers — miR-155 post-transcriptional repression and PRDM1/Blimp1 transcriptional repression — that lower HGAL to relieve its motility-inhibitory function and accompany plasma-cell differentiation.","evidence":"3'-UTR reporter and mutagenesis with RhoA/motility rescue (miR-155); ChIP and promoter-reporter with overexpression (PRDM1)","pmids":["22096245","21722313"],"confidence":"High","gaps":["Quantitative contribution of each repressor in primary GC B cells not delineated","Interplay between transcriptional and post-transcriptional control not integrated"]},{"year":2013,"claim":"Demonstrated that HGAL is a positive regulator of BCR signaling by directly binding and activating Syk, with in vivo transgenic mice developing B-cell lymphoid hyperplasia and elevated Syk phosphorylation.","evidence":"Co-IP, Syk kinase activity assay, HGAL transgenic mice, ex vivo proliferation, and phospho-Syk western blot","pmids":["23299888"],"confidence":"High","gaps":["Structural basis of HGAL-Syk activation not defined","How Syk activation and RhoA inhibition are spatially/temporally coordinated unresolved"]},{"year":2014,"claim":"Resolved how lipid modification dictates HGAL function, showing raft targeting promotes Syk interaction and BCR signaling while abrogating motility inhibition, with BCR stimulation redistributing and degrading HGAL.","evidence":"Myristoylation/palmitoylation assays, membrane fractionation, co-IP, live-cell imaging, and motility/BCR assays","pmids":["25381061"],"confidence":"High","gaps":["Machinery driving HGAL palmitoylation not identified","Mechanism of stimulation-induced degradation not yet defined at this stage"]},{"year":2019,"claim":"Identified the degradation mechanism and refined the synapse function: BCR-induced palmitoylation relocalizes SCF-FBXO10 to the membrane to ubiquitylate HGAL (via H91, phosphorylation-independent) as negative feedback, while phospho-Y107/Grb2/Syk trimeric assembly directs HGAL to the cSMAC.","evidence":"Palmitoylation and ubiquitylation assays, H91 and tyrosine mutagenesis, fractionation, calcium flux, phospho-mapping, and confocal synapse imaging","pmids":["31570756","31362927"],"confidence":"High","gaps":["Structural detail of FBXO10-HGAL recognition via H91 not resolved","Quantitative kinetics linking Grb2 binding to cSMAC dynamics incomplete"]},{"year":2021,"claim":"Extended HGAL's cytoskeletal interactome to tubulin and established causal roles in lymphomagenesis, with constitutive expression driving GC-type DLBCL yet also suppressing dissemination.","evidence":"Unbiased proteomics with tubulin co-IP, conditional transgenic mouse models with three Cre approaches, exon sequencing, and in vivo dissemination/survival models","pmids":["34543391","33024996"],"confidence":"High","gaps":["Tubulin interaction is a newer finding with limited mechanistic follow-up","Reconciliation of HGAL's lymphoma-promoting versus dissemination-suppressing roles unresolved"]},{"year":null,"claim":"How HGAL integrates its dual outputs — positive amplification of BCR/Syk signaling versus inhibition of RhoA-driven and tubulin-associated motility — into a unified GC B-cell program, and the structural basis of its key interactions, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No high-resolution structure of HGAL or its complexes","Spatiotemporal switch between signaling-promoting and motility-inhibiting modes undefined","Therapeutic targetability in DLBCL not established"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[1,2,5,8]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[2,5]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[9]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,6]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,6]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[5,8,7]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[2,5]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[10,9]}],"complexes":["HGAL-Grb2-Syk trimeric complex"],"partners":["SYK","GRB2","LYN","ARHGEF11","ARHGEF12","FBXO10","RHOA","TUBULIN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q8N6F7","full_name":"Germinal center-associated signaling and motility protein","aliases":["Germinal center B-cell-expressed transcript 2 protein","Germinal center-associated lymphoma protein","hGAL"],"length_aa":178,"mass_kda":21.0,"function":"Involved in the negative regulation of lymphocyte motility. It mediates the migration-inhibitory effects of IL6. Serves as a positive regulator of the RhoA signaling pathway. Enhancement of RhoA activation results in inhibition of lymphocyte and lymphoma cell motility by activation of its downstream effector ROCK. Is a regulator of B-cell receptor signaling, that acts through SYK kinase activation","subcellular_location":"Cytoplasm; Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q8N6F7/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GCSAM","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/GCSAM","total_profiled":1310},"omim":[{"mim_id":"607792","title":"GERMINAL CENTER-ASSOCIATED, SIGNALING AND MOTILITY; GCSAM","url":"https://www.omim.org/entry/607792"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":27.4},{"tissue":"skin 1","ntpm":16.1}],"url":"https://www.proteinatlas.org/search/GCSAM"},"hgnc":{"alias_symbol":["MGC40441","HGAL"],"prev_symbol":["GCET2"]},"alphafold":{"accession":"Q8N6F7","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N6F7","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N6F7-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q8N6F7-F1-predicted_aligned_error_v6.png","plddt_mean":56.91},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GCSAM","jax_strain_url":"https://www.jax.org/strain/search?query=GCSAM"},"sequence":{"accession":"Q8N6F7","fasta_url":"https://rest.uniprot.org/uniprotkb/Q8N6F7.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q8N6F7/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q8N6F7"}},"corpus_meta":[{"pmid":"15677569","id":"PMC_15677569","title":"Expression of the human germinal center-associated lymphoma (HGAL) protein, a new marker of germinal center B-cell derivation.","date":"2005","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/15677569","citation_count":88,"is_preprint":false},{"pmid":"12509382","id":"PMC_12509382","title":"HGAL is a novel interleukin-4-inducible gene that strongly predicts survival in diffuse large B-cell lymphoma.","date":"2003","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/12509382","citation_count":75,"is_preprint":false},{"pmid":"29908210","id":"PMC_29908210","title":"The TGFβ-induced lncRNA TBILA promotes non-small cell lung cancer progression in vitro and in vivo via cis-regulating HGAL and activating S100A7/JAB1 signaling.","date":"2018","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/29908210","citation_count":65,"is_preprint":false},{"pmid":"22096245","id":"PMC_22096245","title":"miR-155 regulates HGAL expression and increases lymphoma cell motility.","date":"2011","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/22096245","citation_count":58,"is_preprint":false},{"pmid":"10896115","id":"PMC_10896115","title":"2,3-Dihydro-dithiin and -dithiepine-1,1,4,4-tetroxides: small molecule non-peptide antagonists of the human galanin hGAL-1 receptor.","date":"2000","source":"Bioorganic & medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10896115","citation_count":43,"is_preprint":false},{"pmid":"23299888","id":"PMC_23299888","title":"Germinal centre protein HGAL promotes lymphoid hyperplasia and amyloidosis via BCR-mediated Syk activation.","date":"2013","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/23299888","citation_count":37,"is_preprint":false},{"pmid":"16954503","id":"PMC_16954503","title":"Expression of the human germinal center-associated lymphoma (HGAL) protein identifies a subset of classic Hodgkin lymphoma of germinal center derivation and improved survival.","date":"2006","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/16954503","citation_count":37,"is_preprint":false},{"pmid":"20697248","id":"PMC_20697248","title":"Immunoarchitectural patterns in follicular lymphoma: efficacy of HGAL and LMO2 in the detection of the interfollicular and diffuse components.","date":"2010","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/20697248","citation_count":35,"is_preprint":false},{"pmid":"12819018","id":"PMC_12819018","title":"Two newly characterized germinal center B-cell-associated genes, GCET1 and GCET2, have differential expression in normal and neoplastic B cells.","date":"2003","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/12819018","citation_count":33,"is_preprint":false},{"pmid":"25203428","id":"PMC_25203428","title":"Diagnostic Utility of the Germinal Center-associated Markers GCET1, HGAL, and LMO2 in Hematolymphoid Neoplasms.","date":"2015","source":"Applied immunohistochemistry & molecular morphology : AIMM","url":"https://pubmed.ncbi.nlm.nih.gov/25203428","citation_count":30,"is_preprint":false},{"pmid":"20844236","id":"PMC_20844236","title":"HGAL, a germinal center specific protein, decreases lymphoma cell motility by modulation of the RhoA signaling pathway.","date":"2010","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/20844236","citation_count":28,"is_preprint":false},{"pmid":"25381061","id":"PMC_25381061","title":"HGAL localization to cell membrane regulates B-cell receptor signaling.","date":"2014","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/25381061","citation_count":26,"is_preprint":false},{"pmid":"21502424","id":"PMC_21502424","title":"The efficacy of HGAL and LMO2 in the separation of lymphomas derived from small B cells in nodal and extranodal sites, including the bone marrow.","date":"2011","source":"American journal of clinical 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lymphomas.","date":"2017","source":"Histopathology","url":"https://pubmed.ncbi.nlm.nih.gov/28594133","citation_count":16,"is_preprint":false},{"pmid":"31570756","id":"PMC_31570756","title":"Recent BCR stimulation induces a negative autoregulatory loop via FBXO10 mediated degradation of HGAL.","date":"2019","source":"Leukemia","url":"https://pubmed.ncbi.nlm.nih.gov/31570756","citation_count":15,"is_preprint":false},{"pmid":"18264083","id":"PMC_18264083","title":"Expression of HGAL in primary cutaneous large B-cell lymphomas: evidence for germinal center derivation of primary cutaneous follicular lymphoma.","date":"2008","source":"Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc","url":"https://pubmed.ncbi.nlm.nih.gov/18264083","citation_count":11,"is_preprint":false},{"pmid":"21722313","id":"PMC_21722313","title":"PRDM1/Blimp1 downregulates expression of germinal center genes LMO2 and HGAL.","date":"2011","source":"The FEBS 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pathology","url":"https://pubmed.ncbi.nlm.nih.gov/25701230","citation_count":3,"is_preprint":false},{"pmid":"34907996","id":"PMC_34907996","title":"Human Germinal Center-associated Lymphoma (HGAL) Is a Reliable Marker of Normal and Neoplastic Follicular Helper T Cells Including Angioimmunoblastic T-Cell Lymphoma.","date":"2022","source":"The American journal of surgical pathology","url":"https://pubmed.ncbi.nlm.nih.gov/34907996","citation_count":2,"is_preprint":false},{"pmid":"37519110","id":"PMC_37519110","title":"Value of GCET1, HGAL (GCET2), and LMO2 in the Determination of Germinal Center Phenotype in Diffuse Large B-cell Lymphoma.","date":"2023","source":"Turkish journal of haematology : official journal of Turkish Society of Haematology","url":"https://pubmed.ncbi.nlm.nih.gov/37519110","citation_count":2,"is_preprint":false},{"pmid":"39474423","id":"PMC_39474423","title":"Regulation of BCR-dependent germinal center B-cell formation by HGAL and insight into its emerging myeloid ortholog, C1ORF150.","date":"2024","source":"Frontiers in immunology","url":"https://pubmed.ncbi.nlm.nih.gov/39474423","citation_count":0,"is_preprint":false},{"pmid":"26879427","id":"PMC_26879427","title":"[Expression and significance of HGAL and LMO2 in follicular lymphoma].","date":"2016","source":"Zhonghua bing li xue za zhi = Chinese journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/26879427","citation_count":0,"is_preprint":false},{"pmid":"28056299","id":"PMC_28056299","title":"[Application of rabbit monoclonal antibody GCET2 in diagnosis of diffuse large B cell lymphoma].","date":"2016","source":"Zhonghua bing li xue za zhi = Chinese journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/28056299","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":17159,"output_tokens":3068,"usd":0.048749,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10370,"output_tokens":3549,"usd":0.070288,"stage2_stop_reason":"end_turn"},"total_usd":0.119037,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"HGAL (GCET2) encodes a 178-amino acid cytoplasmic protein containing an immunoreceptor tyrosine-based activation motif (ITAM), and its expression in B cells is specifically induced by interleukin-4 (IL-4).\",\n      \"method\": \"Gene cloning, sequence analysis, IL-4 stimulation of B cells with expression measurement\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cloning with functional stimulation assay (IL-4 induction), single lab, two methods (sequence analysis + expression assay)\",\n      \"pmids\": [\"12509382\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"GCET2/HGAL localizes constitutively to the plasma membrane (but excluded from lipid rafts) via myristoylation and palmitoylation; it can be phosphorylated at its third (Y107, within YENV motif) and fourth tyrosines by LYN, LCK, or SYK kinases; and phosphorylated GCET2 associates with the adaptor protein GRB2 through the Y107 (YENV) site.\",\n      \"method\": \"Serial tyrosine mutagenesis, co-transfection with PTKs in COS7 cells, co-immunoprecipitation with GRB2, cell fractionation/membrane localization assays\",\n      \"journal\": \"British journal of haematology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (mutagenesis, co-IP, fractionation), single lab but rigorous mechanistic dissection\",\n      \"pmids\": [\"17489982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HGAL activates the RhoA signaling pathway by directly binding to the catalytic DH-domain of RhoA-specific guanine nucleotide exchange factors PDZ-RhoGEF and LARG, stimulating GDP-GTP exchange on RhoA, thereby inhibiting lymphoma cell motility.\",\n      \"method\": \"Co-immunoprecipitation, in vitro RhoA GEF activity assay, domain mapping/mutagenesis, cell motility assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro biochemical GEF activity assay combined with domain mapping and functional cell motility readout, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"20844236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"miR-155 directly downregulates HGAL expression by binding to the 3'-UTR of HGAL mRNA, leading to decreased RhoA activation and increased lymphoma cell motility; re-expression of HGAL lacking the miR-155 binding site rescues RhoA activation and motility inhibition.\",\n      \"method\": \"miR-155 binding site reporter assay, HGAL 3'-UTR mutagenesis, RhoA activity assay, cell motility assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct rescue experiment with binding-site mutant plus functional readouts (RhoA, motility), multiple orthogonal methods in one study\",\n      \"pmids\": [\"22096245\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The transcription repressor PRDM1/Blimp1 directly binds to recognition sites in the upstream promoters of HGAL and suppresses HGAL mRNA and protein expression, providing a mechanism for loss of HGAL expression during GC B-cell to plasma cell differentiation.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), promoter-reporter assay, PRDM1 overexpression with mRNA/protein level measurement\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — ChIP demonstrating direct promoter binding plus functional promoter-reporter assay and endogenous protein/mRNA measurement, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"21722313\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"HGAL directly binds to Syk in B cells and increases Syk kinase activity upon B-cell receptor (BCR) stimulation, leading to enhanced activation of Syk downstream effectors and increased RhoA activation; in vivo, HGAL transgenic mice develop polyclonal B-cell lymphoid hyperplasia with elevated Syk phosphorylation.\",\n      \"method\": \"Co-immunoprecipitation, Syk kinase activity assay, HGAL transgenic mouse generation, ex vivo B-cell proliferation assay, phospho-Syk western blot\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay plus co-IP plus in vivo transgenic model with multiple readouts, corroborated by independent studies\",\n      \"pmids\": [\"23299888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"HGAL is myristoylated and palmitoylated, targeting it to membrane raft microdomains; raft localization facilitates interaction with Syk and enhances BCR signaling (with BCR stimulation inducing HGAL phosphorylation and redistribution from lipid raft to bulk membrane/cytoplasm followed by degradation), whereas membrane localization abrogates HGAL's inhibitory effects on chemoattractant-induced cell motility.\",\n      \"method\": \"Lipid modification assays (myristoylation/palmitoylation), membrane fractionation, co-immunoprecipitation, live-cell imaging, cell motility assays, BCR stimulation assays\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods including biochemical lipid modification assays, fractionation, co-IP, and functional motility/signaling readouts in a single rigorous study\",\n      \"pmids\": [\"25381061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"BCR stimulation induces rapid palmitoylation of the SCF-FBXO10 ubiquitin E3 ligase, causing its relocalization to the cell membrane where it ubiquitylates and degrades HGAL; FBXO10 recognition of HGAL is phosphorylation-independent and requires a single conserved HGAL residue (H91) and FBXO10 membrane relocalization; HGAL degradation decreases BCR-induced calcium influx and phosphorylation of proximal BCR effectors.\",\n      \"method\": \"Palmitoylation assay, ubiquitylation assay, site-directed mutagenesis (H91), subcellular fractionation, calcium flux assay, phospho-western blot\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — mutagenesis of critical residue, biochemical ubiquitylation assay, functional calcium flux readout, and spatial relocalization demonstrated with multiple orthogonal methods\",\n      \"pmids\": [\"31570756\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HGAL is phosphorylated by Syk and Lyn kinases at tyrosines Y80, Y86, Y106/Y107, Y128, and Y148; phosphorylated HGAL directly interacts with Grb2 via the YEN motif (Y107); HGAL, Grb2, and Syk form a trimeric complex; HGAL-Grb2 interaction is required for HGAL localization to the central supramolecular activation cluster (cSMAC) upon BCR activation and modulates the rate and intensity of BCR accumulation at the cSMAC.\",\n      \"method\": \"Phosphorylation mapping (mass spectrometry/mutagenesis), co-immunoprecipitation, biochemical binding assays (NMR/isothermal titration calorimetry implied by 'molecular methodologies'), confocal microscopy of BCR synapse, HGAL mutant rescue experiments\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — site mutagenesis, co-IP, biochemical interaction assays, and functional microscopy-based synapse readout in single study with multiple orthogonal methods\",\n      \"pmids\": [\"31362927\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"HGAL interacts with tubulin (identified by unbiased proteomics) in addition to previously known cytoskeletal partners, and this interaction contributes to regulation of cell motility; in novel in vivo DLBCL dissemination models, HGAL expression decreases lymphoma dissemination and prolongs survival.\",\n      \"method\": \"Unbiased proteomic pulldown (mass spectrometry), co-immunoprecipitation with tubulin, in vivo xenograft/animal dissemination models, survival analysis\",\n      \"journal\": \"Blood advances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — proteomics-identified interaction confirmed by co-IP, plus in vivo functional model, but tubulin interaction is a newer finding with limited follow-up\",\n      \"pmids\": [\"34543391\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Constitutive enforced expression of HGAL in vivo (in hematopoietic stem cells, pro-B cells, or GC B cells via Cre-mediated approaches) leads to development of GC B-cell type DLBCL in mice, demonstrating that deregulated HGAL expression contributes to lymphomagenesis.\",\n      \"method\": \"Conditional transgenic mouse models (3 Cre-mediated approaches), immunohistochemistry, exon sequencing of tumors\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three independent conditional transgenic mouse strains all develop DLBCL, with genomic validation by exon sequencing\",\n      \"pmids\": [\"33024996\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HGAL/GCET2 is a GC B-cell-specific adaptor protein that localizes to plasma membrane raft microdomains via myristoylation and palmitoylation; at the membrane it directly binds and activates Syk kinase upon BCR stimulation, recruits Grb2 (via its phospho-Y107 YEN motif, phosphorylated by Syk/Lyn) to promote cSMAC formation, and activates RhoA signaling by binding to the DH-domain of PDZ-RhoGEF/LARG GEFs, thereby inhibiting cell motility; BCR-stimulated palmitoylation of FBXO10 drives its membrane relocalization where it ubiquitylates and degrades HGAL (dependent on HGAL residue H91) as a negative feedback mechanism; HGAL expression is transcriptionally induced by IL-4, repressed by PRDM1/Blimp1, and post-transcriptionally suppressed by miR-155, while constitutive HGAL expression in vivo promotes lymphoid hyperplasia and DLBCL development.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GCSAM (HGAL/GCET2) is a germinal-center B-cell-specific cytoplasmic adaptor protein that integrates B-cell receptor (BCR) signaling with cytoskeletal regulation to control B-cell activation and motility [#0, #5]. It is targeted to plasma membrane raft microdomains by myristoylation and palmitoylation, where lipid modification positions it to interact with Syk and amplify BCR signaling [#1, #6]. Upon BCR engagement, HGAL directly binds and increases the kinase activity of Syk, and is itself phosphorylated by Syk and Lyn at multiple tyrosines; phospho-Y107 within its YEN motif recruits Grb2, forming an HGAL–Grb2–Syk trimeric complex required for HGAL localization to the central supramolecular activation cluster (cSMAC) and for tuning BCR accumulation at the immune synapse [#5, #8]. In parallel, HGAL restrains cell motility by binding the catalytic DH-domain of the RhoA-specific GEFs PDZ-RhoGEF and LARG, stimulating GDP-GTP exchange on RhoA, and by interacting with tubulin [#2, #9]. HGAL abundance is tightly controlled: its expression is induced by IL-4 [#0], transcriptionally repressed by PRDM1/Blimp1 during the GC-to-plasma-cell transition [#4], post-transcriptionally suppressed by miR-155 [#3], and degraded through BCR-induced palmitoylation and membrane relocalization of the SCF–FBXO10 E3 ligase, which ubiquitylates HGAL via its H91 residue as a negative-feedback brake on proximal BCR signaling [#7]. Deregulated, constitutive HGAL expression in vivo drives polyclonal B-cell lymphoid hyperplasia and germinal-center-type diffuse large B-cell lymphoma, while HGAL expression also suppresses lymphoma dissemination and prolongs survival [#5, #9, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Established HGAL as a GC B-cell-associated cytoplasmic protein bearing an ITAM and regulated by cytokine input, identifying it as a candidate signaling adaptor.\",\n      \"evidence\": \"Gene cloning, sequence analysis, and IL-4 stimulation of B cells with expression measurement\",\n      \"pmids\": [\"12509382\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No binding partner or downstream effector identified at this stage\",\n        \"ITAM functional phosphorylation not demonstrated\",\n        \"Subcellular localization not resolved\"\n      ]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined HGAL's membrane targeting and first signaling linkage by showing lipid-modification-dependent plasma membrane localization, tyrosine phosphorylation by Lyn/Lck/Syk, and Grb2 recruitment via the Y107 YENV site.\",\n      \"evidence\": \"Serial tyrosine mutagenesis, co-transfection with PTKs in COS7, co-IP with GRB2, and cell fractionation\",\n      \"pmids\": [\"17489982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional consequence of Grb2 recruitment unresolved\",\n        \"Whether kinase phosphorylation occurs in BCR-stimulated B cells not tested\",\n        \"Initial report placed HGAL outside rafts, later refined\"\n      ]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Connected HGAL to RhoA signaling and cell motility by demonstrating direct binding to the DH-domains of PDZ-RhoGEF and LARG and stimulation of RhoA nucleotide exchange.\",\n      \"evidence\": \"Co-IP, in vitro RhoA GEF activity assay, domain mapping, and lymphoma cell motility assays\",\n      \"pmids\": [\"20844236\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"How HGAL physically couples GEF activation to motility output not fully resolved\",\n        \"Relationship between RhoA arm and BCR-proximal signaling unclear at this stage\"\n      ]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified two independent upstream control layers — miR-155 post-transcriptional repression and PRDM1/Blimp1 transcriptional repression — that lower HGAL to relieve its motility-inhibitory function and accompany plasma-cell differentiation.\",\n      \"evidence\": \"3'-UTR reporter and mutagenesis with RhoA/motility rescue (miR-155); ChIP and promoter-reporter with overexpression (PRDM1)\",\n      \"pmids\": [\"22096245\", \"21722313\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Quantitative contribution of each repressor in primary GC B cells not delineated\",\n        \"Interplay between transcriptional and post-transcriptional control not integrated\"\n      ]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Demonstrated that HGAL is a positive regulator of BCR signaling by directly binding and activating Syk, with in vivo transgenic mice developing B-cell lymphoid hyperplasia and elevated Syk phosphorylation.\",\n      \"evidence\": \"Co-IP, Syk kinase activity assay, HGAL transgenic mice, ex vivo proliferation, and phospho-Syk western blot\",\n      \"pmids\": [\"23299888\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural basis of HGAL-Syk activation not defined\",\n        \"How Syk activation and RhoA inhibition are spatially/temporally coordinated unresolved\"\n      ]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Resolved how lipid modification dictates HGAL function, showing raft targeting promotes Syk interaction and BCR signaling while abrogating motility inhibition, with BCR stimulation redistributing and degrading HGAL.\",\n      \"evidence\": \"Myristoylation/palmitoylation assays, membrane fractionation, co-IP, live-cell imaging, and motility/BCR assays\",\n      \"pmids\": [\"25381061\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Machinery driving HGAL palmitoylation not identified\",\n        \"Mechanism of stimulation-induced degradation not yet defined at this stage\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified the degradation mechanism and refined the synapse function: BCR-induced palmitoylation relocalizes SCF-FBXO10 to the membrane to ubiquitylate HGAL (via H91, phosphorylation-independent) as negative feedback, while phospho-Y107/Grb2/Syk trimeric assembly directs HGAL to the cSMAC.\",\n      \"evidence\": \"Palmitoylation and ubiquitylation assays, H91 and tyrosine mutagenesis, fractionation, calcium flux, phospho-mapping, and confocal synapse imaging\",\n      \"pmids\": [\"31570756\", \"31362927\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Structural detail of FBXO10-HGAL recognition via H91 not resolved\",\n        \"Quantitative kinetics linking Grb2 binding to cSMAC dynamics incomplete\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extended HGAL's cytoskeletal interactome to tubulin and established causal roles in lymphomagenesis, with constitutive expression driving GC-type DLBCL yet also suppressing dissemination.\",\n      \"evidence\": \"Unbiased proteomics with tubulin co-IP, conditional transgenic mouse models with three Cre approaches, exon sequencing, and in vivo dissemination/survival models\",\n      \"pmids\": [\"34543391\", \"33024996\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Tubulin interaction is a newer finding with limited mechanistic follow-up\",\n        \"Reconciliation of HGAL's lymphoma-promoting versus dissemination-suppressing roles unresolved\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How HGAL integrates its dual outputs — positive amplification of BCR/Syk signaling versus inhibition of RhoA-driven and tubulin-associated motility — into a unified GC B-cell program, and the structural basis of its key interactions, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No high-resolution structure of HGAL or its complexes\",\n        \"Spatiotemporal switch between signaling-promoting and motility-inhibiting modes undefined\",\n        \"Therapeutic targetability in DLBCL not established\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [1, 2, 5, 8]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 6]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [5, 8, 7]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [2, 5]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [10, 9]}\n    ],\n    \"complexes\": [\n      \"HGAL-Grb2-Syk trimeric complex\"\n    ],\n    \"partners\": [\n      \"SYK\",\n      \"GRB2\",\n      \"LYN\",\n      \"ARHGEF11\",\n      \"ARHGEF12\",\n      \"FBXO10\",\n      \"RHOA\",\n      \"tubulin\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}