{"gene":"HCLS1","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2012,"finding":"Upon G-CSF stimulation, HCLS1 is phosphorylated and binds the transcription factor LEF-1, transporting LEF-1 into the nucleus to induce LEF-1 autoregulation; HAX1 is required upstream for G-CSF-triggered HCLS1 phosphorylation, and HCLS1-deficient mice are neutropenic.","method":"Co-immunoprecipitation, nuclear fractionation, phosphorylation assays, HCLS1-knockout mouse model, patient mutation analysis","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction shown, nuclear translocation assay, KO mouse with defined neutropenic phenotype, replicated across patient cohorts and cell lines in same study","pmids":["23001182"],"is_preprint":false},{"year":2012,"finding":"HCLS1 phosphorylation is specifically implicated in FL (Flt3-ligand)-dependent proliferation downstream of wild-type Flt3 receptor in myeloid progenitor cells, as identified by comparative phosphoproteome analysis.","method":"Phosphoprotein purification, 2D-PAGE, mass spectrometry, functional proliferation assays in FDC-P1 cell line","journal":"Journal of proteomics","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — phosphoproteomics with functional proliferation readout, single lab, single study","pmids":["23017497"],"is_preprint":false},{"year":2019,"finding":"HCMV latency-associated upregulation of HCLS1 in CD14+ monocytes occurs in a US28-dependent manner, stabilizes actin structure, and increases cell motility and transendothelial migration.","method":"Proteome analysis of latently infected monocytes, US28-deletion virus, motility and transendothelial migration assays, actin staining","journal":"iScience","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — viral genetic manipulation (US28-dependent), functional migration assays, and actin stabilization readout in same study","pmids":["31569051"],"is_preprint":false},{"year":2025,"finding":"NAMPT deacetylates and activates HCLS1 protein in CML cells; activated HCLS1 is essential for clonogenic proliferation of CML cells and regulates downstream targets IL1RAP and LEF-1 in the NAMPT/HCLS1/LEF-1 pathway.","method":"NAMPT inhibition, deacetylation assays, clonogenic growth assays, Western blot, shRNA knockdown of HCLS1","journal":"Experimental hematology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — enzymatic (deacetylation) and functional (clonogenic) assays, pathway placement, single lab, single study","pmids":["40349748"],"is_preprint":false},{"year":2025,"finding":"HCLS1 overexpression inhibits HCT116 colorectal cancer cell proliferation and suppresses TLR4/MYD88/NF-κB (p-p65) signaling; 5-alkylresorcinol exerts anti-cancer effects partly through activating HCLS1.","method":"Overexpression/knockdown plasmids transfected into HCT116 cells, CCK-8 proliferation assay, Western blot, xenograft mouse model with AAV-mediated HCLS1 overexpression","journal":"European journal of medical research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, gain/loss-of-function with pathway readout but mechanism of HCLS1 action on TLR4/NF-κB not directly established","pmids":["40533777"],"is_preprint":false},{"year":1996,"finding":"The human HCLS1 gene maps to chromosome 3q13 and encodes a major substrate of protein-tyrosine kinase p75HS1, involved in signal transduction downstream of antigen receptors in B and T lymphocytes.","method":"Fluorescence in situ hybridization (FISH) using cDNA and genomic DNA probes","journal":"Cytogenetics and cell genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct chromosomal mapping by FISH, substrate identity established by prior biochemical work referenced in paper","pmids":["8978766"],"is_preprint":false}],"current_model":"HCLS1 (HS1) is a hematopoietic cell-specific actin-binding protein and tyrosine kinase substrate that, upon G-CSF stimulation and HAX1-dependent phosphorylation, binds LEF-1 and transports it to the nucleus to drive granulopoiesis; it is additionally regulated by NAMPT-mediated deacetylation to promote CML cell proliferation via a NAMPT/HCLS1/LEF-1 axis, and its upregulation by HCMV latency (US28-dependent) stabilizes actin and enhances monocyte motility and transendothelial migration."},"narrative":{"mechanistic_narrative":"HCLS1 (HS1) is a hematopoietic cell-specific actin-binding protein and tyrosine kinase substrate that couples receptor signaling to transcriptional programs governing myeloid and lymphoid cell function [PMID:23001182, PMID:8978766]. In granulopoiesis, G-CSF stimulation triggers HAX1-dependent phosphorylation of HCLS1, which then binds the transcription factor LEF-1 and transports it into the nucleus to drive LEF-1 autoregulation; loss of HCLS1 produces neutropenia in mice [PMID:23001182]. HCLS1 phosphorylation is also engaged downstream of wild-type Flt3 receptor signaling to support Flt3-ligand-dependent proliferation of myeloid progenitors [PMID:23017497], and it serves as a major substrate of the tyrosine kinase p75HS1 acting downstream of antigen receptors in B and T lymphocytes [PMID:8978766]. In chronic myeloid leukemia, NAMPT deacetylates and activates HCLS1, which is required for clonogenic proliferation and regulates the downstream targets IL1RAP and LEF-1 within a NAMPT/HCLS1/LEF-1 axis [PMID:40349748]. HCMV latency upregulates HCLS1 in CD14+ monocytes in a US28-dependent manner, stabilizing actin structure and enhancing monocyte motility and transendothelial migration [PMID:31569051].","teleology":[{"year":1996,"claim":"Establishing the genomic location and biochemical identity of HCLS1 placed it as a defined tyrosine kinase substrate acting in antigen receptor signaling in lymphocytes.","evidence":"FISH chromosomal mapping to 3q13 and identification as a p75HS1 substrate","pmids":["8978766"],"confidence":"Medium","gaps":["Functional consequence of HCLS1 phosphorylation in lymphocytes not resolved here","No direct partners or downstream effectors defined"]},{"year":2012,"claim":"Defining the G-CSF/HAX1/HCLS1/LEF-1 axis answered how a cytoplasmic kinase substrate transmits a granulopoietic signal to the nucleus, linking HCLS1 directly to a neutropenia phenotype.","evidence":"Co-IP, nuclear fractionation, phosphorylation assays, HCLS1-knockout neutropenic mice, and patient mutation analysis","pmids":["23001182"],"confidence":"High","gaps":["Identity of the kinase directly phosphorylating HCLS1 downstream of HAX1 not specified","Mechanism of LEF-1 nuclear transport by HCLS1 not structurally defined"]},{"year":2012,"claim":"Comparative phosphoproteomics linked HCLS1 phosphorylation to Flt3-receptor-driven proliferation, extending its signaling role beyond G-CSF to another myeloid growth pathway.","evidence":"Phosphoprotein purification, 2D-PAGE, mass spectrometry, and proliferation assays in FDC-P1 cells","pmids":["23017497"],"confidence":"Medium","gaps":["Single cell-line system","Direct kinase-substrate relationship and downstream effectors not established"]},{"year":2019,"claim":"Showing US28-dependent HCLS1 upregulation during HCMV latency connected the protein's actin-binding activity to monocyte migratory behavior, a route for viral dissemination.","evidence":"Proteome analysis of latently infected monocytes, US28-deletion virus, motility/transendothelial migration assays, and actin staining","pmids":["31569051"],"confidence":"Medium","gaps":["Molecular link between US28 and HCLS1 induction unresolved","Mechanism of HCLS1-mediated actin stabilization not detailed"]},{"year":2025,"claim":"Identifying NAMPT-mediated deacetylation of HCLS1 revealed a post-translational activation step that makes HCLS1 essential for leukemic clonogenic proliferation via IL1RAP and LEF-1.","evidence":"NAMPT inhibition, deacetylation assays, clonogenic growth assays, Western blot, and shRNA knockdown in CML cells","pmids":["40349748"],"confidence":"Medium","gaps":["Single lab, single study","Acetylation site(s) and direct enzymatic mechanism not mapped","Whether NAMPT acts directly or via a deacetylase intermediary unclear"]},{"year":2025,"claim":"A gain/loss-of-function study in colorectal cells positioned HCLS1 as a suppressor of TLR4/MYD88/NF-κB signaling and tumor proliferation, suggesting context-dependent roles outside hematopoiesis.","evidence":"Overexpression/knockdown in HCT116 cells, CCK-8 assays, Western blot, and AAV-overexpression xenografts","pmids":["40533777"],"confidence":"Low","gaps":["Mechanism by which HCLS1 acts on TLR4/NF-κB not directly established","Single lab, not independently confirmed","Relevance to endogenous HCLS1 in non-hematopoietic tissue unclear"]},{"year":null,"claim":"The direct kinase(s), acetylation sites, and structural basis by which HCLS1 simultaneously binds actin and shuttles transcription factors remain undefined across the corpus.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model of HCLS1–LEF-1 or HCLS1–actin interaction","Unified picture reconciling actin-binding and transcription-factor-transport functions absent"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[2]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,3]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,1,5]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0]}],"complexes":[],"partners":["LEF-1","HAX1","NAMPT"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P14317","full_name":"Hematopoietic lineage cell-specific protein","aliases":["Hematopoietic cell-specific LYN substrate 1","LckBP1","p75"],"length_aa":486,"mass_kda":54.0,"function":"Substrate of the antigen receptor-coupled tyrosine kinase. Plays a role in antigen receptor signaling for both clonal expansion and deletion in lymphoid cells. May also be involved in the regulation of gene expression","subcellular_location":"Membrane; Cytoplasm; Mitochondrion","url":"https://www.uniprot.org/uniprotkb/P14317/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/HCLS1","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/HCLS1","total_profiled":1310},"omim":[{"mim_id":"613383","title":"ANKYRIN REPEAT DOMAIN-CONTAINING PROTEIN 54; ANKRD54","url":"https://www.omim.org/entry/613383"},{"mim_id":"610738","title":"NEUTROPENIA, SEVERE CONGENITAL, 3, AUTOSOMAL RECESSIVE; SCN3","url":"https://www.omim.org/entry/610738"},{"mim_id":"605998","title":"HCLS1-ASSOCIATED PROTEIN X1; HAX1","url":"https://www.omim.org/entry/605998"},{"mim_id":"601306","title":"HEMATOPOIETIC CELL-SPECIFIC LYN SUBSTRATE 1; HCLS1","url":"https://www.omim.org/entry/601306"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"},{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":145.0},{"tissue":"lymphoid tissue","ntpm":290.6}],"url":"https://www.proteinatlas.org/search/HCLS1"},"hgnc":{"alias_symbol":["HS1","CTTNL"],"prev_symbol":[]},"alphafold":{"accession":"P14317","domains":[{"cath_id":"2.30.30.40","chopping":"432-486","consensus_level":"high","plddt":91.8564,"start":432,"end":486}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P14317","model_url":"https://alphafold.ebi.ac.uk/files/AF-P14317-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P14317-F1-predicted_aligned_error_v6.png","plddt_mean":63.59},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=HCLS1","jax_strain_url":"https://www.jax.org/strain/search?query=HCLS1"},"sequence":{"accession":"P14317","fasta_url":"https://rest.uniprot.org/uniprotkb/P14317.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P14317/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P14317"}},"corpus_meta":[{"pmid":"16716149","id":"PMC_16716149","title":"Identification and functional characterization of hCLS1, a human cardiolipin synthase localized in mitochondria.","date":"2006","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/16716149","citation_count":79,"is_preprint":false},{"pmid":"23001182","id":"PMC_23001182","title":"Interactions among HCLS1, HAX1 and LEF-1 proteins are essential for G-CSF-triggered granulopoiesis.","date":"2012","source":"Nature medicine","url":"https://pubmed.ncbi.nlm.nih.gov/23001182","citation_count":73,"is_preprint":false},{"pmid":"16547353","id":"PMC_16547353","title":"Cloning and characterization of a cDNA encoding human cardiolipin synthase (hCLS1).","date":"2006","source":"Journal of lipid research","url":"https://pubmed.ncbi.nlm.nih.gov/16547353","citation_count":52,"is_preprint":false},{"pmid":"30537294","id":"PMC_30537294","title":"Hematopoietic cell-specific lyn substrate (HCLS1 or HS1): A versatile actin-binding protein in leukocytes.","date":"2018","source":"Journal of leukocyte biology","url":"https://pubmed.ncbi.nlm.nih.gov/30537294","citation_count":31,"is_preprint":false},{"pmid":"27943080","id":"PMC_27943080","title":"Kostmann's Disease and HCLS1-Associated Protein X-1 (HAX1).","date":"2016","source":"Journal of clinical immunology","url":"https://pubmed.ncbi.nlm.nih.gov/27943080","citation_count":30,"is_preprint":false},{"pmid":"31569051","id":"PMC_31569051","title":"Human Cytomegalovirus Upregulates Expression of HCLS1 Resulting in Increased Cell Motility and Transendothelial Migration during Latency.","date":"2019","source":"iScience","url":"https://pubmed.ncbi.nlm.nih.gov/31569051","citation_count":18,"is_preprint":false},{"pmid":"29461873","id":"PMC_29461873","title":"Identification of the Functional Autophagy-Regulatory Domain in HCLS1-Associated Protein X-1 That Resists Against Oxidative Stress.","date":"2018","source":"DNA and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/29461873","citation_count":6,"is_preprint":false},{"pmid":"8978766","id":"PMC_8978766","title":"The human HCLS1 gene maps to chromosome 3q13 by fluorescence in situ hybridization.","date":"1996","source":"Cytogenetics and cell genetics","url":"https://pubmed.ncbi.nlm.nih.gov/8978766","citation_count":6,"is_preprint":false},{"pmid":"35015850","id":"PMC_35015850","title":"Hsa-miR223-3p circulating level is upregulated in Friedreich's ataxia and inversely associated with HCLS1 associated protein X-1, HAX-1.","date":"2022","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/35015850","citation_count":5,"is_preprint":false},{"pmid":"23017497","id":"PMC_23017497","title":"Phosphoproteome analyses reveal specific implications of Hcls1, p21-activated kinase 1 and Ezrin in proliferation of a myeloid progenitor cell line downstream of wild-type and ITD mutant Fms-like tyrosine kinase 3 receptors.","date":"2012","source":"Journal of proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/23017497","citation_count":4,"is_preprint":false},{"pmid":"40533777","id":"PMC_40533777","title":"Therapeutic efficacy of 5-alkylresorcinol on progression of colorectal cancer by activating HCLS1 and suppressing TLR4/MYD88/NF-κB signaling.","date":"2025","source":"European journal of medical research","url":"https://pubmed.ncbi.nlm.nih.gov/40533777","citation_count":2,"is_preprint":false},{"pmid":"38847679","id":"PMC_38847679","title":"Correlation between elevated HCLS1 levels and heart failure: A diagnostic biomarker.","date":"2024","source":"Medicine","url":"https://pubmed.ncbi.nlm.nih.gov/38847679","citation_count":0,"is_preprint":false},{"pmid":"40349748","id":"PMC_40349748","title":"NAMPT-mediated deacetylation of HCLS1 protein promotes clonogenic growth of pediatric CML cells.","date":"2025","source":"Experimental hematology","url":"https://pubmed.ncbi.nlm.nih.gov/40349748","citation_count":0,"is_preprint":false},{"pmid":"25448489","id":"PMC_25448489","title":"WITHDRAWN: Assessment of hematopoietic and neurologic pathophysiology of HCLS1-associated protein X-1 deficiency in a Hax1-knockout mouse model.","date":"2014","source":"Experimental hematology","url":"https://pubmed.ncbi.nlm.nih.gov/25448489","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8384,"output_tokens":1491,"usd":0.023758,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8148,"output_tokens":2478,"usd":0.051345,"stage2_stop_reason":"end_turn"},"total_usd":0.075103,"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\": 2012,\n      \"finding\": \"Upon G-CSF stimulation, HCLS1 is phosphorylated and binds the transcription factor LEF-1, transporting LEF-1 into the nucleus to induce LEF-1 autoregulation; HAX1 is required upstream for G-CSF-triggered HCLS1 phosphorylation, and HCLS1-deficient mice are neutropenic.\",\n      \"method\": \"Co-immunoprecipitation, nuclear fractionation, phosphorylation assays, HCLS1-knockout mouse model, patient mutation analysis\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction shown, nuclear translocation assay, KO mouse with defined neutropenic phenotype, replicated across patient cohorts and cell lines in same study\",\n      \"pmids\": [\"23001182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"HCLS1 phosphorylation is specifically implicated in FL (Flt3-ligand)-dependent proliferation downstream of wild-type Flt3 receptor in myeloid progenitor cells, as identified by comparative phosphoproteome analysis.\",\n      \"method\": \"Phosphoprotein purification, 2D-PAGE, mass spectrometry, functional proliferation assays in FDC-P1 cell line\",\n      \"journal\": \"Journal of proteomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — phosphoproteomics with functional proliferation readout, single lab, single study\",\n      \"pmids\": [\"23017497\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"HCMV latency-associated upregulation of HCLS1 in CD14+ monocytes occurs in a US28-dependent manner, stabilizes actin structure, and increases cell motility and transendothelial migration.\",\n      \"method\": \"Proteome analysis of latently infected monocytes, US28-deletion virus, motility and transendothelial migration assays, actin staining\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — viral genetic manipulation (US28-dependent), functional migration assays, and actin stabilization readout in same study\",\n      \"pmids\": [\"31569051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"NAMPT deacetylates and activates HCLS1 protein in CML cells; activated HCLS1 is essential for clonogenic proliferation of CML cells and regulates downstream targets IL1RAP and LEF-1 in the NAMPT/HCLS1/LEF-1 pathway.\",\n      \"method\": \"NAMPT inhibition, deacetylation assays, clonogenic growth assays, Western blot, shRNA knockdown of HCLS1\",\n      \"journal\": \"Experimental hematology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — enzymatic (deacetylation) and functional (clonogenic) assays, pathway placement, single lab, single study\",\n      \"pmids\": [\"40349748\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"HCLS1 overexpression inhibits HCT116 colorectal cancer cell proliferation and suppresses TLR4/MYD88/NF-κB (p-p65) signaling; 5-alkylresorcinol exerts anti-cancer effects partly through activating HCLS1.\",\n      \"method\": \"Overexpression/knockdown plasmids transfected into HCT116 cells, CCK-8 proliferation assay, Western blot, xenograft mouse model with AAV-mediated HCLS1 overexpression\",\n      \"journal\": \"European journal of medical research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, gain/loss-of-function with pathway readout but mechanism of HCLS1 action on TLR4/NF-κB not directly established\",\n      \"pmids\": [\"40533777\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The human HCLS1 gene maps to chromosome 3q13 and encodes a major substrate of protein-tyrosine kinase p75HS1, involved in signal transduction downstream of antigen receptors in B and T lymphocytes.\",\n      \"method\": \"Fluorescence in situ hybridization (FISH) using cDNA and genomic DNA probes\",\n      \"journal\": \"Cytogenetics and cell genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct chromosomal mapping by FISH, substrate identity established by prior biochemical work referenced in paper\",\n      \"pmids\": [\"8978766\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"HCLS1 (HS1) is a hematopoietic cell-specific actin-binding protein and tyrosine kinase substrate that, upon G-CSF stimulation and HAX1-dependent phosphorylation, binds LEF-1 and transports it to the nucleus to drive granulopoiesis; it is additionally regulated by NAMPT-mediated deacetylation to promote CML cell proliferation via a NAMPT/HCLS1/LEF-1 axis, and its upregulation by HCMV latency (US28-dependent) stabilizes actin and enhances monocyte motility and transendothelial migration.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"HCLS1 (HS1) is a hematopoietic cell-specific actin-binding protein and tyrosine kinase substrate that couples receptor signaling to transcriptional programs governing myeloid and lymphoid cell function [#0, #5]. In granulopoiesis, G-CSF stimulation triggers HAX1-dependent phosphorylation of HCLS1, which then binds the transcription factor LEF-1 and transports it into the nucleus to drive LEF-1 autoregulation; loss of HCLS1 produces neutropenia in mice [#0]. HCLS1 phosphorylation is also engaged downstream of wild-type Flt3 receptor signaling to support Flt3-ligand-dependent proliferation of myeloid progenitors [#1], and it serves as a major substrate of the tyrosine kinase p75HS1 acting downstream of antigen receptors in B and T lymphocytes [#5]. In chronic myeloid leukemia, NAMPT deacetylates and activates HCLS1, which is required for clonogenic proliferation and regulates the downstream targets IL1RAP and LEF-1 within a NAMPT/HCLS1/LEF-1 axis [#3]. HCMV latency upregulates HCLS1 in CD14+ monocytes in a US28-dependent manner, stabilizing actin structure and enhancing monocyte motility and transendothelial migration [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 1996,\n      \"claim\": \"Establishing the genomic location and biochemical identity of HCLS1 placed it as a defined tyrosine kinase substrate acting in antigen receptor signaling in lymphocytes.\",\n      \"evidence\": \"FISH chromosomal mapping to 3q13 and identification as a p75HS1 substrate\",\n      \"pmids\": [\"8978766\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of HCLS1 phosphorylation in lymphocytes not resolved here\", \"No direct partners or downstream effectors defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Defining the G-CSF/HAX1/HCLS1/LEF-1 axis answered how a cytoplasmic kinase substrate transmits a granulopoietic signal to the nucleus, linking HCLS1 directly to a neutropenia phenotype.\",\n      \"evidence\": \"Co-IP, nuclear fractionation, phosphorylation assays, HCLS1-knockout neutropenic mice, and patient mutation analysis\",\n      \"pmids\": [\"23001182\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the kinase directly phosphorylating HCLS1 downstream of HAX1 not specified\", \"Mechanism of LEF-1 nuclear transport by HCLS1 not structurally defined\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Comparative phosphoproteomics linked HCLS1 phosphorylation to Flt3-receptor-driven proliferation, extending its signaling role beyond G-CSF to another myeloid growth pathway.\",\n      \"evidence\": \"Phosphoprotein purification, 2D-PAGE, mass spectrometry, and proliferation assays in FDC-P1 cells\",\n      \"pmids\": [\"23017497\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single cell-line system\", \"Direct kinase-substrate relationship and downstream effectors not established\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showing US28-dependent HCLS1 upregulation during HCMV latency connected the protein's actin-binding activity to monocyte migratory behavior, a route for viral dissemination.\",\n      \"evidence\": \"Proteome analysis of latently infected monocytes, US28-deletion virus, motility/transendothelial migration assays, and actin staining\",\n      \"pmids\": [\"31569051\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular link between US28 and HCLS1 induction unresolved\", \"Mechanism of HCLS1-mediated actin stabilization not detailed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Identifying NAMPT-mediated deacetylation of HCLS1 revealed a post-translational activation step that makes HCLS1 essential for leukemic clonogenic proliferation via IL1RAP and LEF-1.\",\n      \"evidence\": \"NAMPT inhibition, deacetylation assays, clonogenic growth assays, Western blot, and shRNA knockdown in CML cells\",\n      \"pmids\": [\"40349748\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab, single study\", \"Acetylation site(s) and direct enzymatic mechanism not mapped\", \"Whether NAMPT acts directly or via a deacetylase intermediary unclear\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"A gain/loss-of-function study in colorectal cells positioned HCLS1 as a suppressor of TLR4/MYD88/NF-\\u03baB signaling and tumor proliferation, suggesting context-dependent roles outside hematopoiesis.\",\n      \"evidence\": \"Overexpression/knockdown in HCT116 cells, CCK-8 assays, Western blot, and AAV-overexpression xenografts\",\n      \"pmids\": [\"40533777\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Mechanism by which HCLS1 acts on TLR4/NF-\\u03baB not directly established\", \"Single lab, not independently confirmed\", \"Relevance to endogenous HCLS1 in non-hematopoietic tissue unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct kinase(s), acetylation sites, and structural basis by which HCLS1 simultaneously binds actin and shuttles transcription factors remain undefined across the corpus.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model of HCLS1\\u2013LEF-1 or HCLS1\\u2013actin interaction\", \"Unified picture reconciling actin-binding and transcription-factor-transport functions absent\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 1, 5]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"LEF-1\", \"HAX1\", \"NAMPT\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":4,"faith_total":5,"faith_pct":80.0}}