{"gene":"GYPA","run_date":"2026-06-10T01:55:21","timeline":{"discoveries":[{"year":2010,"finding":"The GPA (Glycophorin A) transmembrane domain dimerization propensity is strongly influenced by lipid bilayer thickness, with dimerization most efficient under hydrophobic matching conditions. Cholesterol promotes self-association of GPA transmembrane helices by increasing lipid acyl chain ordering. The order of lipid acyl chains is a key determinant of the strength and stability of the GPA TM helix-helix interaction.","method":"Fluorescence spectroscopy of fluorescent-labeled GPA transmembrane peptides in model membranes with varying lipid compositions","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biophysical assay in reconstituted model membranes, single lab, multiple lipid conditions tested, but abstract-level detail only","pmids":["20603102"],"is_preprint":false},{"year":2009,"finding":"The hereditary spherostomatocytosis AE1 mutation E758K requires coexpressed Glycophorin A (GPA) for surface expression in Xenopus oocytes. GPA dependence extends to DIDS-sensitive Cl− influx, trans-anion-dependent Cl− efflux, Cl−/HCO3− exchange, SO4²− uptake, and oxalate uptake activities of the mutant AE1 E758K. By contrast, the Rb+ influx and inward cation currents associated with AE1 E758K expression were largely GPA-independent, indicating that GPA selectively enables surface trafficking and anion transport of this AE1 mutant but is not required for its cation permeability pathway.","method":"Xenopus and Ambystoma oocyte expression system with 36Cl− flux assays, 86Rb+ influx assays, electrophysiology, and pharmacological inhibition; coexpression with/without GPA","journal":"American journal of physiology. Cell physiology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal transport assays in two oocyte systems, systematic dissection of GPA-dependent vs GPA-independent activities, rigorous pharmacological controls","pmids":["19907019"],"is_preprint":false},{"year":1999,"finding":"A point mutation in GPA (Ala65→Pro) disrupts expression of the high-incidence ENEP antigen and creates a novel low-incidence antigen (HAG), and additionally causes aberrant (reduced) Wrb expression on red blood cells. Since band 3 from the same patient had normal Glu658 (required for Wrb), the altered Wrb expression is directly attributable to the Ala65→Pro mutation in GPA, providing direct evidence that a specific GPA epitope (involving residue Ala65) is necessary for normal Wrb expression — i.e., for the GPA–band 3 interaction required for Wrb.","method":"DNA sequencing of GYPA and band 3 genes; serological blood group antigen typing; identification of two unrelated individuals homozygous or heterozygous for the mutation","journal":"Transfusion medicine (Oxford, England)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and serological evidence from two unrelated individuals with natural mutation, direct molecular characterization, but no in vitro reconstitution of the GPA–band 3 interaction","pmids":["10354388"],"is_preprint":false},{"year":2018,"finding":"Resequencing of GYPA in populations from P. falciparum endemic and non-endemic regions revealed patterns of variation consistent with balancing selection acting on GYPA in malaria-endemic populations and Europeans. Exon 2 of GYPA, which encodes the receptor-binding domain for P. falciparum EBA-175 (the 175-kDa erythrocyte-binding antigen), shows signatures of selection, consistent with GPA's experimentally established role as the major binding site for P. falciparum on erythrocytes.","method":"Population resequencing and population genetics analyses (neutrality tests) across malaria-endemic and non-endemic populations","journal":"Human genetics","confidence":"Low","confidence_rationale":"Tier 4 / Weak — population genetics inference only; the mechanistic claim (GPA as P. falciparum binding site) is referenced from prior work, not directly demonstrated in this paper","pmids":["29362874"],"is_preprint":false},{"year":2016,"finding":"During early erythropoiesis from human pluripotent stem cells (hPSCs), GPA (Glycophorin A/CD235a) is expressed as one of the earliest surface markers of the definitive erythroblast lineage, with initial GPA+CD34lowCD36− cells maturing into GPA+CD36low/+ cells with higher β-globin expression, establishing GPA surface expression as a stage-specific marker functionally linked to erythroid commitment and maturation.","method":"hPSC co-culture differentiation system with serial flow cytometric analysis of CD34, GPA/CD235a, CD36, β-globin expression","journal":"Stem cell reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — expression-based characterization during differentiation; GPA used as a marker rather than having its function directly manipulated; no loss-of-function experiment","pmids":["27720903"],"is_preprint":false},{"year":2015,"finding":"Growing thrombi release elevated levels of Glycophorin-A-positive (CD235a+) erythrocyte-derived microparticles (ErMPs) into distal perfusing blood, as shown in ex vivo perfusion experiments and validated in STEMI patient blood. The release of CD235a+ ErMPs is directly related to thrombus mass and plasma procoagulant activity, indicating that GPA-expressing erythrocyte microparticles are shed during thrombosis and contribute to the procoagulant environment.","method":"Ex vivo perfusion of thrombogenic surfaces with triple-labeling flow cytometry; thrombin generation assays; validation in STEMI patient coronary and peripheral blood","journal":"Journal of thrombosis and haemostasis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ex vivo mechanistic perfusion experiments with clinical validation, multiple orthogonal methods, but CD235a used as erythrocyte identity marker rather than functionally manipulated","pmids":["26239059"],"is_preprint":false},{"year":2014,"finding":"Gene conversion events between GYPA and GYPB produce GYPA-B-A hybrid genes via unequal homologous recombination, resulting in a segmental transfer of a GYPB sequence (including intron 1 and exon 2) into GYPA. This causes an amino acid substitution at position 13 (Arg→Glu, c.38C>A) in the GPA protein. Despite this substitution, normal M and N antigen expression is maintained, and the hybrid is associated with a heterozygous deletion of GYPB exon 2 in all probands.","method":"Sequence analysis of GYPA exons 1–7 and GYPB exons 1–5 from genomic DNA and cDNA; haplotype separation; serological blood group typing","journal":"Vox sanguinis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — combined gDNA and cDNA sequencing with haplotype analysis and serological confirmation, single lab study","pmids":["24916810"],"is_preprint":false}],"current_model":"Glycophorin A (GYPA/GPA/CD235a) is a highly abundant erythrocyte sialoglycoprotein whose transmembrane domain forms sequence-specific homodimers in lipid bilayers, with dimerization efficiency regulated by membrane lipid composition and acyl chain ordering; its extracellular domain (encoded by exon 2) serves as the primary erythrocyte receptor for P. falciparum EBA-175; GPA physically interacts with band 3 (AE1/SLC4A1) in the membrane — a specific GPA epitope at Ala65 is required for normal Wrb antigen expression and for normal AE1 surface trafficking and anion transport activity — while during erythropoiesis GPA surface expression marks early definitive erythroblast commitment, and GPA-bearing erythrocyte-derived microparticles are shed from thrombi and contribute to local procoagulant activity."},"narrative":{"mechanistic_narrative":"Glycophorin A (GYPA/GPA/CD235a) is an abundant erythrocyte sialoglycoprotein whose transmembrane domain forms sequence-specific homodimers whose stability is governed by the lipid environment: dimerization is most efficient under hydrophobic-matching conditions, and cholesterol promotes helix self-association by increasing acyl-chain ordering [PMID:20603102]. Beyond its own oligomerization, GPA functions as an obligatory partner for the band 3 anion exchanger (AE1/SLC4A1): coexpression of GPA is required for surface trafficking and anion-transport activity (Cl− flux, Cl−/HCO3− exchange, sulfate and oxalate uptake) of the spherostomatocytosis mutant AE1 E758K, while the mutant's cation permeability is GPA-independent [PMID:19907019]. A specific GPA epitope involving Ala65 is necessary for this interaction, as an Ala65→Pro substitution disrupts the high-incidence ENEP antigen and aberrantly reduces Wrb expression even when band 3 is normal [PMID:10354388]. GPA also serves as the principal erythrocyte attachment site for Plasmodium falciparum: its exon 2-encoded receptor-binding domain shows population-genetic signatures of balancing selection in malaria-endemic regions [PMID:29362874]. During erythropoiesis, GPA surface expression marks early definitive erythroblast commitment [PMID:27720903], and GPA-bearing erythrocyte-derived microparticles are shed from growing thrombi and contribute to local procoagulant activity [PMID:26239059]. The GYPA locus is subject to gene-conversion exchange with GYPB, generating hybrid genes and antigenic variation [PMID:24916810].","teleology":[{"year":1999,"claim":"Established that a discrete GPA epitope (residue Ala65) is required for the GPA-band 3 interaction underlying normal Wrb antigen expression, localizing the contact surface to the extracellular domain.","evidence":"DNA sequencing of GYPA and band 3 plus serological antigen typing in unrelated individuals carrying a natural Ala65Pro mutation","pmids":["10354388"],"confidence":"Medium","gaps":["No in vitro reconstitution of the GPA-band 3 interaction","Structural basis of the Ala65 contact not resolved"]},{"year":2009,"claim":"Defined GPA as a functional requirement for band 3 surface trafficking and anion transport, distinguishing GPA-dependent (anion) from GPA-independent (cation) activities of the AE1 E758K mutant.","evidence":"Xenopus and Ambystoma oocyte coexpression with 36Cl− flux, 86Rb+ influx, electrophysiology, and pharmacological inhibition","pmids":["19907019"],"confidence":"High","gaps":["Tested with a disease mutant rather than wild-type AE1","Molecular mechanism by which GPA chaperones AE1 to the surface unresolved"]},{"year":2010,"claim":"Showed that GPA transmembrane homodimerization is not intrinsic but tuned by membrane physical state, with hydrophobic matching and cholesterol-driven acyl-chain ordering setting helix-helix stability.","evidence":"Fluorescence spectroscopy of labeled GPA TM peptides in model membranes of varying lipid composition","pmids":["20603102"],"confidence":"Medium","gaps":["Performed in reconstituted model membranes, not native erythrocyte membranes","Functional consequence of lipid-tuned dimerization not assayed"]},{"year":2014,"claim":"Demonstrated that the GYPA locus generates antigenic and sequence diversity through unequal homologous recombination with GYPB, producing GYPA-B-A hybrid alleles.","evidence":"gDNA and cDNA sequencing with haplotype separation and serological blood group typing","pmids":["24916810"],"confidence":"Medium","gaps":["Functional impact of the position-13 substitution beyond preserved M/N antigens not assessed","Single-lab study"]},{"year":2015,"claim":"Linked GPA-bearing erythrocyte microparticles to thrombosis, showing they are shed in proportion to thrombus mass and add to procoagulant activity.","evidence":"Ex vivo thrombogenic-surface perfusion with triple-label flow cytometry and thrombin generation assays, validated in STEMI patient blood","pmids":["26239059"],"confidence":"Medium","gaps":["CD235a used as erythrocyte identity marker rather than functionally manipulated","Specific contribution of GPA itself to procoagulant activity not isolated"]},{"year":2016,"claim":"Positioned GPA surface expression as one of the earliest markers of definitive erythroblast commitment during hPSC differentiation.","evidence":"hPSC co-culture differentiation with serial flow cytometry for CD34, CD235a, CD36, and β-globin","pmids":["27720903"],"confidence":"Low","gaps":["Marker-based correlation only; no loss-of-function manipulation of GPA","Causal role of GPA in commitment not tested"]},{"year":2018,"claim":"Provided population-genetic evidence that GYPA exon 2, the P. falciparum EBA-175 binding domain, is under balancing selection in malaria-endemic populations.","evidence":"Population resequencing and neutrality testing across endemic and non-endemic populations","pmids":["29362874"],"confidence":"Low","gaps":["The receptor function is referenced from prior work, not demonstrated here","Inference is statistical, not mechanistic"]},{"year":null,"claim":"How lipid-tuned GPA dimerization, band 3 chaperoning, and pathogen-receptor function are integrated at the native erythrocyte membrane, and whether GPA loss-of-function alters erythroid commitment, remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structure of the GPA-band 3 complex in the corpus","No direct GPA loss-of-function experiment in erythropoiesis","Direct biochemical demonstration of EBA-175 binding absent from the timeline"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[3]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[1,2]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,2,4,5]}],"pathway":[],"complexes":[],"partners":["SLC4A1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P02724","full_name":"Glycophorin-A","aliases":["MN sialoglycoprotein","PAS-2","Sialoglycoprotein alpha"],"length_aa":150,"mass_kda":16.4,"function":"Component of the ankyrin-1 complex, a multiprotein complex involved in the stability and shape of the erythrocyte membrane (PubMed:35835865). Glycophorin A is the major intrinsic membrane protein of the erythrocyte. The N-terminal glycosylated segment, which lies outside the erythrocyte membrane, has MN blood group receptors. Appears to be important for the function of SLC4A1 and is required for high activity of SLC4A1. May be involved in translocation of SLC4A1 to the plasma membrane (Microbial infection) Appears to be a receptor for Hepatitis A virus (HAV) (Microbial infection) Receptor for P.falciparum erythrocyte-binding antigen 175 (EBA-175); binding of EBA-175 is dependent on sialic acid residues of the O-linked glycans","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/P02724/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/GYPA","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":1208,"dependency_fraction":0.0008278145695364238},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/GYPA","total_profiled":1310},"omim":[{"mim_id":"617923","title":"GLYCOPHORIN B; GYPB","url":"https://www.omim.org/entry/617923"},{"mim_id":"617922","title":"GLYCOPHORIN A; GYPA","url":"https://www.omim.org/entry/617922"},{"mim_id":"616182","title":"CHRONIC MOUNTAIN SICKNESS, SUSCEPTIBILITY TO","url":"https://www.omim.org/entry/616182"},{"mim_id":"614865","title":"D4Z4 BINDING ELEMENT TRANSCRIPT, NONCODING; DBET","url":"https://www.omim.org/entry/614865"},{"mim_id":"612157","title":"SENTRIN-SPECIFIC PROTEASE FAMILY, MEMBER 1; SENP1","url":"https://www.omim.org/entry/612157"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in some","driving_tissues":[{"tissue":"bone marrow","ntpm":147.2}],"url":"https://www.proteinatlas.org/search/GYPA"},"hgnc":{"alias_symbol":["GPA","MN","CD235a","PAS-2"],"prev_symbol":["MNS"]},"alphafold":{"accession":"P02724","domains":[],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P02724","model_url":"https://alphafold.ebi.ac.uk/files/AF-P02724-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P02724-F1-predicted_aligned_error_v6.png","plddt_mean":59.41},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=GYPA","jax_strain_url":"https://www.jax.org/strain/search?query=GYPA"},"sequence":{"accession":"P02724","fasta_url":"https://rest.uniprot.org/uniprotkb/P02724.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P02724/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P02724"}},"corpus_meta":[{"pmid":"25393678","id":"PMC_25393678","title":"GPA: a statistical approach to prioritizing GWAS results by integrating pleiotropy and 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A","url":"https://pubmed.ncbi.nlm.nih.gov/25011055","citation_count":7,"is_preprint":false},{"pmid":"24285424","id":"PMC_24285424","title":"X-ray absorption spectroscopy of GeO2 glass to 64 GPa.","date":"2013","source":"Journal of physics. Condensed matter : an Institute of Physics journal","url":"https://pubmed.ncbi.nlm.nih.gov/24285424","citation_count":7,"is_preprint":false},{"pmid":"32153294","id":"PMC_32153294","title":"The HXD95: a modified Bassett-type hydrothermal diamond-anvil cell for in situ XRD experiments up to 5 GPa and 1300 K.","date":"2020","source":"Journal of synchrotron radiation","url":"https://pubmed.ncbi.nlm.nih.gov/32153294","citation_count":7,"is_preprint":false},{"pmid":"15502223","id":"PMC_15502223","title":"The GPA in vivo somatic mutation assay.","date":"2005","source":"Methods in molecular biology (Clifton, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/15502223","citation_count":7,"is_preprint":false},{"pmid":"23249011","id":"PMC_23249011","title":"Thermodynamic properties of aqueous sodium sulfate solutions to 773 K and 3 GPa derived from acoustic velocity measurements in the diamond anvil cell.","date":"2012","source":"The Journal of chemical physics","url":"https://pubmed.ncbi.nlm.nih.gov/23249011","citation_count":7,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46882,"output_tokens":2838,"usd":0.091608,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9397,"output_tokens":2554,"usd":0.055418,"stage2_stop_reason":"end_turn"},"total_usd":0.147026,"stage1_batch_id":"msgbatch_01DUPACZi7AAWwuZiUjseQF4","stage2_batch_id":"msgbatch_018yt7chE3f48PEFtDwtj6AE","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking through the abstracts, I need to identify papers about the canonical human GYPA gene (Glycophorin A, CD235a, PAS-2) and extract mechanistic findings.\n\nLet me classify the papers:\n- Papers about GYPA (human glycophorin A): 6, 13, 15, 25, 57, 71, 74, 94, 95, 99\n- Papers about high-pressure physics (GPa units): 3, 4, 14, 17, 22, 23, 24, 37, 41, 42, 43, 45, 46, 48, 51, 52, 55, 56, 60, 61, 62, 67, 70, 72, 73, 75, 81, 82, 83 (lambda phage), 85 (glycogen phosphorylase), 88, 91, 92, 93, 96, 97, 98, 100\n- C. elegans G-protein alpha subunits (GPA-3, GPA-16, etc.): 2, 7, 8, 9, 36, 58, 59, 63 — these are C. elegans Gα proteins, NOT orthologs of GYPA\n- Statistical/bioinformatics GPA: 1, 34\n- Chick GPA (growth factor): 16, 30\n- GPA peptide (Gly-Pro-Ala): 18, 21, 35\n- Beta-GPA (beta-guanidinopropionic acid): 27, 39, 65, 86\n- Bacteriophage lambda gpA: 26, 44, 69, 83\n- Forensic/population GYPA typing: 5, 28, 29, 32, 64, 78, 79, 84, 90\n- Pneumocystis gpA: 38, 40\n- Medical GPA (granulomatosis with polyangiitis): 11, 12, 20, 33, 53, 68, 89\n- Other: 10, 19, 31, 74, 80, 99 — GPA somatic mutation assay (uses GYPA as reporter)\n\nNow extracting mechanistic findings from GYPA papers:\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2010,\n      \"finding\": \"The GPA (Glycophorin A) transmembrane domain dimerization propensity is strongly influenced by lipid bilayer thickness, with dimerization most efficient under hydrophobic matching conditions. Cholesterol promotes self-association of GPA transmembrane helices by increasing lipid acyl chain ordering. The order of lipid acyl chains is a key determinant of the strength and stability of the GPA TM helix-helix interaction.\",\n      \"method\": \"Fluorescence spectroscopy of fluorescent-labeled GPA transmembrane peptides in model membranes with varying lipid compositions\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biophysical assay in reconstituted model membranes, single lab, multiple lipid conditions tested, but abstract-level detail only\",\n      \"pmids\": [\"20603102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The hereditary spherostomatocytosis AE1 mutation E758K requires coexpressed Glycophorin A (GPA) for surface expression in Xenopus oocytes. GPA dependence extends to DIDS-sensitive Cl− influx, trans-anion-dependent Cl− efflux, Cl−/HCO3− exchange, SO4²− uptake, and oxalate uptake activities of the mutant AE1 E758K. By contrast, the Rb+ influx and inward cation currents associated with AE1 E758K expression were largely GPA-independent, indicating that GPA selectively enables surface trafficking and anion transport of this AE1 mutant but is not required for its cation permeability pathway.\",\n      \"method\": \"Xenopus and Ambystoma oocyte expression system with 36Cl− flux assays, 86Rb+ influx assays, electrophysiology, and pharmacological inhibition; coexpression with/without GPA\",\n      \"journal\": \"American journal of physiology. Cell physiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal transport assays in two oocyte systems, systematic dissection of GPA-dependent vs GPA-independent activities, rigorous pharmacological controls\",\n      \"pmids\": [\"19907019\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"A point mutation in GPA (Ala65→Pro) disrupts expression of the high-incidence ENEP antigen and creates a novel low-incidence antigen (HAG), and additionally causes aberrant (reduced) Wrb expression on red blood cells. Since band 3 from the same patient had normal Glu658 (required for Wrb), the altered Wrb expression is directly attributable to the Ala65→Pro mutation in GPA, providing direct evidence that a specific GPA epitope (involving residue Ala65) is necessary for normal Wrb expression — i.e., for the GPA–band 3 interaction required for Wrb.\",\n      \"method\": \"DNA sequencing of GYPA and band 3 genes; serological blood group antigen typing; identification of two unrelated individuals homozygous or heterozygous for the mutation\",\n      \"journal\": \"Transfusion medicine (Oxford, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and serological evidence from two unrelated individuals with natural mutation, direct molecular characterization, but no in vitro reconstitution of the GPA–band 3 interaction\",\n      \"pmids\": [\"10354388\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Resequencing of GYPA in populations from P. falciparum endemic and non-endemic regions revealed patterns of variation consistent with balancing selection acting on GYPA in malaria-endemic populations and Europeans. Exon 2 of GYPA, which encodes the receptor-binding domain for P. falciparum EBA-175 (the 175-kDa erythrocyte-binding antigen), shows signatures of selection, consistent with GPA's experimentally established role as the major binding site for P. falciparum on erythrocytes.\",\n      \"method\": \"Population resequencing and population genetics analyses (neutrality tests) across malaria-endemic and non-endemic populations\",\n      \"journal\": \"Human genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — population genetics inference only; the mechanistic claim (GPA as P. falciparum binding site) is referenced from prior work, not directly demonstrated in this paper\",\n      \"pmids\": [\"29362874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"During early erythropoiesis from human pluripotent stem cells (hPSCs), GPA (Glycophorin A/CD235a) is expressed as one of the earliest surface markers of the definitive erythroblast lineage, with initial GPA+CD34lowCD36− cells maturing into GPA+CD36low/+ cells with higher β-globin expression, establishing GPA surface expression as a stage-specific marker functionally linked to erythroid commitment and maturation.\",\n      \"method\": \"hPSC co-culture differentiation system with serial flow cytometric analysis of CD34, GPA/CD235a, CD36, β-globin expression\",\n      \"journal\": \"Stem cell reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — expression-based characterization during differentiation; GPA used as a marker rather than having its function directly manipulated; no loss-of-function experiment\",\n      \"pmids\": [\"27720903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Growing thrombi release elevated levels of Glycophorin-A-positive (CD235a+) erythrocyte-derived microparticles (ErMPs) into distal perfusing blood, as shown in ex vivo perfusion experiments and validated in STEMI patient blood. The release of CD235a+ ErMPs is directly related to thrombus mass and plasma procoagulant activity, indicating that GPA-expressing erythrocyte microparticles are shed during thrombosis and contribute to the procoagulant environment.\",\n      \"method\": \"Ex vivo perfusion of thrombogenic surfaces with triple-labeling flow cytometry; thrombin generation assays; validation in STEMI patient coronary and peripheral blood\",\n      \"journal\": \"Journal of thrombosis and haemostasis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ex vivo mechanistic perfusion experiments with clinical validation, multiple orthogonal methods, but CD235a used as erythrocyte identity marker rather than functionally manipulated\",\n      \"pmids\": [\"26239059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Gene conversion events between GYPA and GYPB produce GYPA-B-A hybrid genes via unequal homologous recombination, resulting in a segmental transfer of a GYPB sequence (including intron 1 and exon 2) into GYPA. This causes an amino acid substitution at position 13 (Arg→Glu, c.38C>A) in the GPA protein. Despite this substitution, normal M and N antigen expression is maintained, and the hybrid is associated with a heterozygous deletion of GYPB exon 2 in all probands.\",\n      \"method\": \"Sequence analysis of GYPA exons 1–7 and GYPB exons 1–5 from genomic DNA and cDNA; haplotype separation; serological blood group typing\",\n      \"journal\": \"Vox sanguinis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — combined gDNA and cDNA sequencing with haplotype analysis and serological confirmation, single lab study\",\n      \"pmids\": [\"24916810\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"Glycophorin A (GYPA/GPA/CD235a) is a highly abundant erythrocyte sialoglycoprotein whose transmembrane domain forms sequence-specific homodimers in lipid bilayers, with dimerization efficiency regulated by membrane lipid composition and acyl chain ordering; its extracellular domain (encoded by exon 2) serves as the primary erythrocyte receptor for P. falciparum EBA-175; GPA physically interacts with band 3 (AE1/SLC4A1) in the membrane — a specific GPA epitope at Ala65 is required for normal Wrb antigen expression and for normal AE1 surface trafficking and anion transport activity — while during erythropoiesis GPA surface expression marks early definitive erythroblast commitment, and GPA-bearing erythrocyte-derived microparticles are shed from thrombi and contribute to local procoagulant activity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"Glycophorin A (GYPA/GPA/CD235a) is an abundant erythrocyte sialoglycoprotein whose transmembrane domain forms sequence-specific homodimers whose stability is governed by the lipid environment: dimerization is most efficient under hydrophobic-matching conditions, and cholesterol promotes helix self-association by increasing acyl-chain ordering [#0]. Beyond its own oligomerization, GPA functions as an obligatory partner for the band 3 anion exchanger (AE1/SLC4A1): coexpression of GPA is required for surface trafficking and anion-transport activity (Cl\\u2212 flux, Cl\\u2212/HCO3\\u2212 exchange, sulfate and oxalate uptake) of the spherostomatocytosis mutant AE1 E758K, while the mutant's cation permeability is GPA-independent [#1]. A specific GPA epitope involving Ala65 is necessary for this interaction, as an Ala65\\u2192Pro substitution disrupts the high-incidence ENEP antigen and aberrantly reduces Wrb expression even when band 3 is normal [#2]. GPA also serves as the principal erythrocyte attachment site for Plasmodium falciparum: its exon 2-encoded receptor-binding domain shows population-genetic signatures of balancing selection in malaria-endemic regions [#3]. During erythropoiesis, GPA surface expression marks early definitive erythroblast commitment [#4], and GPA-bearing erythrocyte-derived microparticles are shed from growing thrombi and contribute to local procoagulant activity [#5]. The GYPA locus is subject to gene-conversion exchange with GYPB, generating hybrid genes and antigenic variation [#6].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established that a discrete GPA epitope (residue Ala65) is required for the GPA-band 3 interaction underlying normal Wrb antigen expression, localizing the contact surface to the extracellular domain.\",\n      \"evidence\": \"DNA sequencing of GYPA and band 3 plus serological antigen typing in unrelated individuals carrying a natural Ala65Pro mutation\",\n      \"pmids\": [\"10354388\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No in vitro reconstitution of the GPA-band 3 interaction\", \"Structural basis of the Ala65 contact not resolved\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined GPA as a functional requirement for band 3 surface trafficking and anion transport, distinguishing GPA-dependent (anion) from GPA-independent (cation) activities of the AE1 E758K mutant.\",\n      \"evidence\": \"Xenopus and Ambystoma oocyte coexpression with 36Cl\\u2212 flux, 86Rb+ influx, electrophysiology, and pharmacological inhibition\",\n      \"pmids\": [\"19907019\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tested with a disease mutant rather than wild-type AE1\", \"Molecular mechanism by which GPA chaperones AE1 to the surface unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed that GPA transmembrane homodimerization is not intrinsic but tuned by membrane physical state, with hydrophobic matching and cholesterol-driven acyl-chain ordering setting helix-helix stability.\",\n      \"evidence\": \"Fluorescence spectroscopy of labeled GPA TM peptides in model membranes of varying lipid composition\",\n      \"pmids\": [\"20603102\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Performed in reconstituted model membranes, not native erythrocyte membranes\", \"Functional consequence of lipid-tuned dimerization not assayed\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated that the GYPA locus generates antigenic and sequence diversity through unequal homologous recombination with GYPB, producing GYPA-B-A hybrid alleles.\",\n      \"evidence\": \"gDNA and cDNA sequencing with haplotype separation and serological blood group typing\",\n      \"pmids\": [\"24916810\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional impact of the position-13 substitution beyond preserved M/N antigens not assessed\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked GPA-bearing erythrocyte microparticles to thrombosis, showing they are shed in proportion to thrombus mass and add to procoagulant activity.\",\n      \"evidence\": \"Ex vivo thrombogenic-surface perfusion with triple-label flow cytometry and thrombin generation assays, validated in STEMI patient blood\",\n      \"pmids\": [\"26239059\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CD235a used as erythrocyte identity marker rather than functionally manipulated\", \"Specific contribution of GPA itself to procoagulant activity not isolated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Positioned GPA surface expression as one of the earliest markers of definitive erythroblast commitment during hPSC differentiation.\",\n      \"evidence\": \"hPSC co-culture differentiation with serial flow cytometry for CD34, CD235a, CD36, and \\u03b2-globin\",\n      \"pmids\": [\"27720903\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Marker-based correlation only; no loss-of-function manipulation of GPA\", \"Causal role of GPA in commitment not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Provided population-genetic evidence that GYPA exon 2, the P. falciparum EBA-175 binding domain, is under balancing selection in malaria-endemic populations.\",\n      \"evidence\": \"Population resequencing and neutrality testing across endemic and non-endemic populations\",\n      \"pmids\": [\"29362874\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"The receptor function is referenced from prior work, not demonstrated here\", \"Inference is statistical, not mechanistic\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How lipid-tuned GPA dimerization, band 3 chaperoning, and pathogen-receptor function are integrated at the native erythrocyte membrane, and whether GPA loss-of-function alters erythroid commitment, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structure of the GPA-band 3 complex in the corpus\", \"No direct GPA loss-of-function experiment in erythropoiesis\", \"Direct biochemical demonstration of EBA-175 binding absent from the timeline\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 2, 4, 5]}\n    ],\n    \"pathway\": [],\n    \"complexes\": [],\n    \"partners\": [\"SLC4A1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}