{"gene":"SEC23B","run_date":"2026-06-10T07:46:30","timeline":{"discoveries":[{"year":2009,"finding":"SEC23B is a component of the COPII coat protein complex required for ER-to-Golgi protein transport, and loss-of-function mutations in SEC23B cause congenital dyserythropoietic anemia type II (CDAII). shRNA-mediated suppression of SEC23B in human cells recapitulates the cytokinesis defect characteristic of CDAII, and knockdown of zebrafish sec23b leads to aberrant erythrocyte development, establishing a selective role for SEC23B (vs. its paralog SEC23A) in erythroid differentiation.","method":"shRNA knockdown in human cells (cytokinesis phenotype readout), zebrafish sec23b morpholino knockdown, sequencing of patient mutations","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function experiments in two independent model systems (human cells and zebrafish), replicated across two contemporaneous studies identifying SEC23B mutations","pmids":["19561605"],"is_preprint":false},{"year":2009,"finding":"SEC23B encodes a COPII coat component; mutations in SEC23B disturb ER-to-Golgi trafficking, causing hypoglycosylation of erythrocyte membrane proteins (e.g., band 3) characteristic of CDAII. Twelve distinct mutations (missense, frameshift, splicing, nonsense) were identified using a proteomic-genomic approach matching the cytoplasmic RBC proteome to the CDAN2 chromosomal locus.","method":"Sanger sequencing of patient cohort, proteomic-genomic mapping approach","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutation identification in 13 patients confirmed by two independent groups; mechanistic inference (ER-Golgi trafficking disruption) supported by cellular phenotype but not directly reconstituted","pmids":["19621418"],"is_preprint":false},{"year":2012,"finding":"Complete SEC23B deficiency in mice causes perinatal death with degeneration of professional secretory tissues (pancreatic acini, salivary glands) but not liver. SEC23B-deficient exocrine pancreas shows absence of zymogen granules, severely distended ER, and activation of the proapoptotic unfolded protein response (UPR), demonstrating that SEC23B is specifically required for ER exit of highly abundant secretory cargo in professional secretory tissues.","method":"Germline Sec23b knockout mouse; electron microscopy of pancreatic acini; immunohistochemistry for UPR markers; comparison with salivary gland and liver phenotypes","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean germline KO mouse with defined ultrastructural and molecular phenotype, replicated in multiple tissues with mechanistic pathway (UPR/apoptosis) identified","pmids":["22745161"],"is_preprint":false},{"year":2014,"finding":"Hematopoietic-specific SEC23B deficiency in mice does not produce anemia or other CDAII features. SEC23B-deficient hematopoietic stem cells show no competitive disadvantage in repopulation assays, demonstrating that the erythroid phenotype in human CDAII is not caused by a cell-autonomous defect detectable in the mouse hematopoietic compartment—likely reflecting an evolutionary shift in SEC23 paralog expression.","method":"Conditional hematopoietic Sec23b knockout (bone marrow transplantation); competitive repopulation assays; secondary bone marrow transplants","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with competitive repopulation readout, multiple transplant experiments in single rigorous study","pmids":["25071156"],"is_preprint":false},{"year":2016,"finding":"Pancreatic SEC23B deficiency alone is sufficient to explain the perinatal lethality of germline SEC23B-deficient mice. Pancreas-specific SEC23A deficiency does not cause lethality or pancreatic pathology, demonstrating that SEC23B but not SEC23A is essential for murine pancreatic development.","method":"Pancreas-specific conditional Sec23b and Sec23a knockouts; BAC transgene rescue of germline Sec23b gene-trap lethality; immunohistochemistry","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — tissue-specific KO with transgene rescue and paralog comparison, multiple genetic controls","pmids":["27297878"],"is_preprint":false},{"year":2017,"finding":"SEC23B is required for normal function of pancreatic acinar cells in adult mice. Tamoxifen-inducible acinar-specific Sec23b deletion in adults causes pancreatic cell loss, decreased zymogen granules, ER alterations (ranging from vesicular ER to massively expanded cisternae with intracisternal granules), induction of ER stress, and increased apoptosis.","method":"Tamoxifen-inducible pancreatic acinar-cell-specific Sec23b knockout; electron microscopy; ER stress marker analysis; apoptosis assays; pancreatic weight and DNA/RNA/protein quantification","journal":"Molecular biology of the cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — inducible conditional KO with multiple orthogonal readouts (ultrastructure, ER stress, apoptosis, organ weight)","pmids":["28539403"],"is_preprint":false},{"year":2018,"finding":"SEC23A and SEC23B have indistinguishable intracellular protein interactomes; both can complement yeast Sec23 and rescue zebrafish sec23b deficiency. A Sec23a coding sequence knocked into the murine Sec23b locus completely rescues the lethal SEC23B-deficient pancreatic phenotype, demonstrating functional equivalence. The distinct disease phenotypes of SEC23A/B deficiency across species are explained by evolutionary shifts in transcription program rather than intrinsic biochemical differences.","method":"Mass spectrometry interactome comparison; yeast complementation assay; zebrafish transgene rescue; Sec23a-knock-in mouse at Sec23b locus","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (interactome, yeast complementation, zebrafish rescue, knock-in mouse) across independent species/systems","pmids":["30065114"],"is_preprint":false},{"year":2018,"finding":"The F-box protein FBXW5 targets SEC23B for proteasomal degradation, limiting autophagic flux in nutrient-replete conditions. In response to starvation, ULK1 phosphorylates SEC23B on Serine 186, preventing FBXW5 binding and thereby stabilizing SEC23B. Phosphorylated/stabilized SEC23B associates preferentially with SEC24A and SEC24B (not SEC24C or SEC24D) and relocalizes to the ER-Golgi intermediate compartment, promoting autophagosome biogenesis.","method":"Co-immunoprecipitation; mass spectrometry; in vitro kinase assay (ULK1 phosphorylation of SEC23B S186); site-directed mutagenesis; proteasome inhibitor rescue; autophagy flux assays; subcellular fractionation/localization","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro kinase assay with mutagenesis, reciprocal Co-IP, multiple orthogonal methods in single rigorous study","pmids":["30596474"],"is_preprint":false},{"year":2018,"finding":"Cancer-associated mutant SEC23B localizes to nucleoli (in addition to ER/Golgi), independently of other COPII proteins and without compromising canonical secretory function. Mutant cells show increased ribosomal protein and translation-related gene expression, enhanced translational capacity under ER stress, and increased UBF transcription factor binding at ribosomal DNA promoters. Mutant SEC23B binds UBF, suggesting a non-canonical COPII-independent function in ribosome biogenesis.","method":"Immunofluorescence/confocal microscopy for subcellular localization; Co-immunoprecipitation (SEC23B–UBF interaction); chromatin immunoprecipitation (UBF at rDNA promoter); polysome profiling; gene expression arrays","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — reciprocal Co-IP and ChIP with localization data, single lab but multiple orthogonal methods","pmids":["29893852"],"is_preprint":false},{"year":2021,"finding":"Wild-type SEC23B localizes to the nucleus (in addition to the ER/Golgi interface) and contains functional nuclear localization and export signals. Under proteasome inhibition, wild-type SEC23B additionally localizes to nucleoli. Unbiased proteomic analysis (mass spectrometry) shows wild-type SEC23B interacts with nuclear proteins and with central components of the ER stress, protein ubiquitination, and EIF2 signaling pathways. SEC23B levels increase in response to ER stress, and a genotype-specific differential interaction between SEC23B and UBA52 (RPL40) was validated.","method":"Immunofluorescence for nuclear/nucleolar localization; mass spectrometry proteomics of SEC23B interactome; Co-immunoprecipitation (SEC23B–UBA52); ER stress induction and Western blotting; patient-derived lymphoblastoid cell lines","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — mass spectrometry interactome with Co-IP validation and localization data, single lab","pmids":["33753724"],"is_preprint":false},{"year":2021,"finding":"Erythroid-specific deletion of all four Sec23 alleles (both Sec23a and Sec23b) in mice causes mid-embryonic death with features of CDAII; deletion of three alleles produces a milder erythroid defect. In SEC23B-deficient human HUDEP-2 cells, CDAII features upon differentiation are rescued by increased SEC23A expression, demonstrating functional overlap between paralogs in human erythroid cells and proposing SEC23A upregulation as a therapeutic strategy.","method":"Erythroid-specific conditional double-KO (Sec23a/Sec23b) mouse; HUDEP-2 SEC23B-KO cells; SEC23A overexpression rescue; erythroid differentiation assays","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis via compound KO in vivo plus human cell-line rescue experiment with functional readout","pmids":["34818036"],"is_preprint":false},{"year":2021,"finding":"The E109K missense mutation (most common human CDAII mutation) in mice leads to decreased SEC23B protein levels and protein mislocalization. Hemizygosity for E109K combined with a null allele (Sec23bki/ko) causes exocrine pancreatic insufficiency with ER stress and apoptosis, chronic pancreatitis, and severe growth restriction with growth hormone insensitivity; hepatocyte-specific Sec23b deletion does not cause growth restriction, indicating a non-hepatic (pancreatic) origin.","method":"Knockin mouse (E109K); hemizygous compound mouse model; pancreas-specific conditional KO; histology; ER stress markers; GH signaling analysis; growth measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple mouse genetic models with tissue-specific deletion controls and molecular pathway analysis","pmids":["34954140"],"is_preprint":false},{"year":2022,"finding":"SEC23B loss-of-function in hepatic cells (HuH7 and HepG2 stably silenced for SEC23B) impairs glycosylation of membrane proteins involved in BMP/SMAD pathway activation (including those needed to sense BMP6), leading to suppression of hepcidin expression and altered iron homeostasis. SEC23A overexpression rescues hepcidin suppression in SEC23B-deficient hepatic cells, confirming functional paralog overlap.","method":"Stable SEC23B shRNA silencing in HuH7 and HepG2 cells; BMP/SMAD pathway reporter and Western blot; hepcidin mRNA quantification; BMP6 stimulation assays; SEC23A rescue overexpression; glycosylation analysis","journal":"International journal of molecular sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — stable KD in two cell lines with pathway analysis and rescue, single lab","pmids":["35163229"],"is_preprint":false},{"year":2020,"finding":"SEC23B deletion in colorectal cancer cells suppresses membrane localization of adhesion proteins EPCAM and CD9, augments cell mobility and invasiveness in vitro and in vivo. SEC23B mutations (premature stop C649T, or transport-impairing C1467G and T488C+G791A+G2153A) inhibit COPII-dependent transport of EPCAM and CD9, attenuating cell adhesion.","method":"Whole-exome sequencing of patient samples; SEC23B deletion in CRC cell lines; membrane fractionation for EPCAM/CD9 localization; invasion/migration assays; xenograft mouse model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — KO with cargo localization assay and functional readout, in vitro and in vivo, single lab","pmids":["32123160"],"is_preprint":false},{"year":2020,"finding":"HBV envelope S domain selectively interacts with SEC23B (and SEC24A) among COPII paralogs; silencing of SEC23B (but not other Sec23 isoforms) strongly reduces ER export of HBV envelope and subviral particle secretion. The interaction involves the N-terminal half of SEC24A and a di-arginine motif in the S domain.","method":"Yeast-based proteomics; siRNA silencing of Sec23/24 paralogs in HBV-expressing liver cells; subviral particle secretion assay; co-immunoprecipitation/interaction mapping","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — paralog-selective siRNA knockdown with functional secretion readout plus interaction domain mapping, single lab","pmids":["32017353"],"is_preprint":false},{"year":2015,"finding":"A germline heterozygous SEC23B missense variant (p.Val594Gly) associated with Cowden syndrome causes ER-stress-mediated increased cell colony formation, survival, growth, and invasion in a normal thyroid cell line, demonstrating that heterozygous change-of-function SEC23B variants have a cancer-predisposing mechanism distinct from the loss-of-function homozygous mutations causing CDAII.","method":"Whole-exome and Sanger sequencing; functional characterization of p.Val594Gly in normal thyroid cell line (NHT cells): colony formation, growth, invasion assays; ER stress marker analysis","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — functional assays in cell line with multiple phenotypic readouts, single lab","pmids":["26522472"],"is_preprint":false},{"year":2013,"finding":"Hypomorphic SEC23B alleles (with reduced but not abolished expression) are associated with milder CDAII phenotypes. The data suggest SEC23A-mediated compensation: when SEC23B expression is merely reduced rather than functionally altered, SEC23A can partially substitute, resulting in less severe clinical presentation.","method":"Sequencing of five novel hypomorphic mutations; SEC23B mRNA and protein quantification in patient erythroid precursors; clinical severity correlation","journal":"Blood cells, molecules & diseases","confidence":"Low","confidence_rationale":"Tier 3 / Weak — protein/mRNA quantification in patient samples, inferred SEC23A compensation without direct rescue experiment","pmids":["23453696"],"is_preprint":false}],"current_model":"SEC23B is a core component of COPII-coated vesicles that mediates ER-to-Golgi transport of secretory proteins; it is targeted for proteasomal degradation by FBXW5, a process opposed by ULK1-mediated phosphorylation on Ser186 during starvation to promote autophagosome biogenesis, and its canonical transport function is required for professional secretory tissue homeostasis (particularly pancreatic acinar cells), erythroid maturation, hepatic hepcidin regulation, and membrane localization of adhesion molecules, while cancer-associated heterozygous variants additionally drive a non-canonical nucleolar function linked to ribosome biogenesis and ER stress."},"narrative":{"mechanistic_narrative":"SEC23B is a core component of the COPII coat that drives ER-to-Golgi transport of secretory cargo, and its dysfunction underlies congenital dyserythropoietic anemia type II (CDAII), where loss-of-function mutations disrupt trafficking and cause hypoglycosylation of erythrocyte membrane proteins such as band 3 [PMID:19561605, PMID:19621418]. The canonical transport function is especially critical in professional secretory tissues: complete SEC23B deficiency in mice causes perinatal death with degeneration of pancreatic acini and salivary glands, loss of zymogen granules, distended ER, and proapoptotic unfolded protein response activation, and acinar-specific or E109K-mutant models reproduce ER stress, apoptosis, and exocrine pancreatic insufficiency [PMID:22745161, PMID:28539403, PMID:34954140]. SEC23B and its paralog SEC23A are biochemically interchangeable—they share interactomes, complement yeast Sec23, and a Sec23a knock-in fully rescues the lethal Sec23b pancreatic phenotype—so the distinct, tissue- and species-specific disease phenotypes reflect divergent paralog expression programs rather than intrinsic functional differences [PMID:30065114, PMID:34818036]. Beyond constitutive secretion, SEC23B is regulated to support autophagy: FBXW5 targets it for proteasomal degradation under nutrient-replete conditions, while starvation-activated ULK1 phosphorylates SEC23B on Ser186 to block FBXW5 binding, stabilizing it and redirecting it (with SEC24A/SEC24B) to the ER-Golgi intermediate compartment to promote autophagosome biogenesis [PMID:30596474]. Its cargo-selective transport role extends to glycosylation-dependent BMP/SMAD signaling and hepcidin regulation in hepatocytes [PMID:35163229] and to membrane delivery of the adhesion molecules EPCAM and CD9, whose loss augments cancer cell motility [PMID:32123160]. Cancer-associated heterozygous variants confer a non-canonical, COPII-independent gain of function: mutant SEC23B localizes to nucleoli, binds the rDNA transcription factor UBF, and enhances ribosomal protein expression and translational capacity under ER stress, a mechanism distinct from the recessive loss-of-function CDAII alleles [PMID:29893852, PMID:26522472].","teleology":[{"year":2009,"claim":"Established that SEC23B is a COPII coat component whose loss causes CDAII, defining the gene's disease association and a cell-autonomous erythroid requirement distinct from its paralog SEC23A.","evidence":"shRNA knockdown in human cells with cytokinesis readout, zebrafish morpholino knockdown, and patient mutation sequencing; parallel proteomic-genomic mapping linking band 3 hypoglycosylation to the CDAN2 locus","pmids":["19561605","19621418"],"confidence":"High","gaps":["Mechanism of cytokinesis defect not resolved at molecular level","Trafficking disruption inferred from cellular phenotype, not biochemically reconstituted"]},{"year":2012,"claim":"Showed that SEC23B is specifically required for ER exit of abundant secretory cargo in professional secretory tissues, explaining perinatal lethality via UPR-driven secretory tissue degeneration.","evidence":"Germline Sec23b knockout mouse with EM of pancreatic acini and UPR marker immunohistochemistry, contrasting pancreas/salivary gland versus liver","pmids":["22745161"],"confidence":"High","gaps":["Mouse lethality does not model the human erythroid phenotype","Cargo specificity in pancreas not defined at the individual-protein level"]},{"year":2014,"claim":"Demonstrated that the human CDAII erythroid defect is not recapitulated by cell-autonomous loss in the mouse hematopoietic compartment, pointing toward species-specific paralog usage.","evidence":"Conditional hematopoietic Sec23b knockout with competitive bone-marrow repopulation and secondary transplant assays","pmids":["25071156"],"confidence":"High","gaps":["Does not directly identify which paralog compensates in mouse erythroid cells","Human-mouse divergence mechanism inferred, not demonstrated"]},{"year":2016,"claim":"Pinpointed the pancreas as the tissue responsible for germline-null lethality and confirmed SEC23B (not SEC23A) is essential for murine pancreatic development.","evidence":"Pancreas-specific Sec23b and Sec23a conditional knockouts plus BAC transgene rescue of gene-trap lethality","pmids":["27297878"],"confidence":"High","gaps":["Basis of paralog-specific essentiality (expression vs. function) not yet resolved here"]},{"year":2017,"claim":"Established a continuing requirement for SEC23B in adult acinar cell homeostasis, not just development.","evidence":"Tamoxifen-inducible adult acinar-specific Sec23b knockout with EM, ER-stress markers, apoptosis assays, and organ quantification","pmids":["28539403"],"confidence":"High","gaps":["Specific cargo whose mistrafficking drives ER stress not identified"]},{"year":2018,"claim":"Resolved whether SEC23A and SEC23B differ intrinsically: they are biochemically interchangeable, so disease phenotype divergence stems from transcriptional program differences across tissues and species.","evidence":"Mass spectrometry interactome comparison, yeast complementation, zebrafish rescue, and a Sec23a knock-in at the Sec23b locus rescuing the pancreatic phenotype","pmids":["30065114"],"confidence":"High","gaps":["Regulatory basis of paralog expression switching not mapped","Does not address non-canonical functions of either paralog"]},{"year":2018,"claim":"Uncovered post-translational regulation coupling SEC23B abundance to nutrient status, linking COPII machinery to autophagosome biogenesis.","evidence":"Co-IP, mass spectrometry, in vitro ULK1 kinase assay on Ser186, site-directed mutagenesis, proteasome rescue, and autophagy flux assays","pmids":["30596474"],"confidence":"High","gaps":["How SEC23B at the ERGIC mechanistically drives autophagosome formation is not detailed","Physiological contexts where this pathway operates not defined"]},{"year":2018,"claim":"Identified a non-canonical, COPII-independent nucleolar function for cancer-associated mutant SEC23B in ribosome biogenesis, separating change-of-function from loss-of-function mechanisms.","evidence":"Immunofluorescence localization, SEC23B-UBF Co-IP, ChIP at rDNA promoters, polysome profiling, and gene expression arrays in mutant cells","pmids":["29893852"],"confidence":"Medium","gaps":["Single-lab data without independent replication","Direct biochemical basis of UBF regulation by SEC23B not established"]},{"year":2015,"claim":"Demonstrated that a heterozygous Cowden-associated SEC23B variant acts via an ER-stress-mediated cancer-predisposing mechanism distinct from recessive CDAII alleles.","evidence":"Sequencing plus colony formation, growth, invasion, and ER-stress marker assays for p.Val594Gly in a normal thyroid cell line","pmids":["26522472"],"confidence":"Medium","gaps":["Single cell-line system, no in vivo confirmation","Link between ER stress and oncogenic phenotype mechanistically incomplete"]},{"year":2020,"claim":"Extended SEC23B's cargo-selective transport role to adhesion molecule delivery and viral particle secretion, showing functional consequences for cancer cell behavior and HBV egress.","evidence":"SEC23B deletion/mutation in CRC cells with EPCAM/CD9 membrane fractionation, invasion/xenograft assays; paralog-selective siRNA in HBV-expressing cells with secretion and interaction-mapping assays","pmids":["32123160","32017353"],"confidence":"Medium","gaps":["Cargo selectivity determinants for EPCAM/CD9 versus HBV S domain not unified","Single-lab findings for each cargo"]},{"year":2021,"claim":"Showed paralog functional overlap in human erythroid cells and identified nuclear/nucleolar localization and ER-stress-responsive interactions of even wild-type SEC23B.","evidence":"Erythroid-specific Sec23a/Sec23b compound knockout mice, HUDEP-2 SEC23B-KO rescued by SEC23A overexpression; SEC23B nuclear localization signals, mass spectrometry interactome, and SEC23B-UBA52 Co-IP in patient lymphoblastoid lines","pmids":["34818036","33753724"],"confidence":"High","gaps":["Functional consequence of nuclear localization for wild-type SEC23B not defined","Therapeutic SEC23A upregulation strategy not validated in vivo for human disease"]},{"year":2021,"claim":"Modeled the most common human CDAII mutation in mice, linking E109K to protein destabilization/mislocalization, pancreatic insufficiency, and growth hormone insensitivity of pancreatic origin.","evidence":"E109K knock-in and hemizygous compound mouse models with tissue-specific deletion controls, histology, ER-stress markers, and GH signaling analysis","pmids":["34954140"],"confidence":"High","gaps":["Does not reconcile pancreatic-dominant mouse phenotype with erythroid-dominant human disease","Molecular link between SEC23B loss and GH insensitivity not fully defined"]},{"year":2022,"claim":"Connected SEC23B-dependent glycosylation to BMP/SMAD-driven hepcidin regulation, defining a hepatic role in iron homeostasis.","evidence":"Stable SEC23B silencing in HuH7/HepG2 with BMP/SMAD reporters, hepcidin mRNA quantification, glycosylation analysis, and SEC23A rescue","pmids":["35163229"],"confidence":"Medium","gaps":["Specific BMP-sensing membrane protein dependent on SEC23B not definitively identified","In vivo confirmation of hepatic iron phenotype lacking"]},{"year":null,"claim":"How wild-type SEC23B's nuclear/nucleolar pool and its UBF/UBA52 interactions integrate with its canonical COPII transport function, and whether this constitutes a regulated physiological switch versus a mutation-specific activity, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of SEC23B engaging nucleolar partners","Whether nuclear function is regulated in normal cells or only emerges with variants is unclear","Mechanism connecting ER stress to SEC23B nuclear accumulation undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,13]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,6]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[0,2,7]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[0,7]},{"term_id":"GO:0005730","term_label":"nucleolus","supporting_discovery_ids":[8,9]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[9]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[0,2,13]},{"term_id":"R-HSA-9612973","term_label":"Autophagy","supporting_discovery_ids":[7]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[2,5,9]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[13,14]}],"complexes":["COPII coat"],"partners":["SEC24A","SEC24B","FBXW5","ULK1","UBF","UBA52"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q15437","full_name":"Protein transport protein Sec23B","aliases":["SEC23-related protein B"],"length_aa":767,"mass_kda":86.5,"function":"Component of the coat protein complex II (COPII) which promotes the formation of transport vesicles from the endoplasmic reticulum (ER). 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Zhonghua xueyexue zazhi","url":"https://pubmed.ncbi.nlm.nih.gov/31104444","citation_count":1,"is_preprint":false},{"pmid":"35820731","id":"PMC_35820731","title":"SEC23B missense mutation-associated congenital dyserythropoietic anaemia type II in a child: a rare mimic of chronic haemolytic anaemia.","date":"2022","source":"BMJ case reports","url":"https://pubmed.ncbi.nlm.nih.gov/35820731","citation_count":1,"is_preprint":false},{"pmid":"38655690","id":"PMC_38655690","title":"Identification of a novel splice variant in SEC23B gene in a patient with concomitant presence of congenital dyserythropoietic anemia II and Gilbert's syndrome.","date":"2024","source":"Hematology (Amsterdam, Netherlands)","url":"https://pubmed.ncbi.nlm.nih.gov/38655690","citation_count":0,"is_preprint":false},{"pmid":"34365611","id":"PMC_34365611","title":"[Variant analysis of SEC23B gene in 4 families with congenital dyserythropoietic anemia].","date":"2021","source":"Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/34365611","citation_count":0,"is_preprint":false},{"pmid":"33914262","id":"PMC_33914262","title":"Compound heterozygosity for two novel mutations of the SEC23B gene in congenital dyserythropoietic anemia type II.","date":"2021","source":"International journal of hematology","url":"https://pubmed.ncbi.nlm.nih.gov/33914262","citation_count":0,"is_preprint":false},{"pmid":"17940563","id":"PMC_17940563","title":"[In vitro study about the inhibitory effect of CDAII in combination with sodium butyrate on breast cancer cells].","date":"2007","source":"Beijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences","url":"https://pubmed.ncbi.nlm.nih.gov/17940563","citation_count":0,"is_preprint":false},{"pmid":"41657939","id":"PMC_41657939","title":"Additive effect of multiple genetic variants in SEC23B and PIEZO1 on iron metabolism dyshomeostasis in hereditary anemias.","date":"2026","source":"HemaSphere","url":"https://pubmed.ncbi.nlm.nih.gov/41657939","citation_count":0,"is_preprint":false},{"pmid":"15745056","id":"PMC_15745056","title":"[Congenital dyserythropoietic anemia--type II (CDA-II) in 3 siblings with long-term follow up and iron overload].","date":"2004","source":"Acta medica (Hradec Kralove). Supplementum","url":"https://pubmed.ncbi.nlm.nih.gov/15745056","citation_count":0,"is_preprint":false},{"pmid":"42197534","id":"PMC_42197534","title":"Salmonella Effector SpvC Targets SEC23B of Intestinal Epithelial Cells to Resist Gasdermin D-Mediated Protection Against Systemic Infection.","date":"2026","source":"Microorganisms","url":"https://pubmed.ncbi.nlm.nih.gov/42197534","citation_count":0,"is_preprint":false},{"pmid":"19175987","id":"PMC_19175987","title":"[In vitro study of the effects of CDA-II combined with cAMP on apoptosis induction in retinoic acid resistant acute promyelocytic leukemia cells].","date":"2008","source":"Zhonghua xue ye xue za zhi = Zhonghua xueyexue zazhi","url":"https://pubmed.ncbi.nlm.nih.gov/19175987","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.05.15.25327006","title":"High prevalence of deleterious germline variants in cancer risk genes among subjects with young-onset, sporadic pituitary macroadenomas","date":"2025-05-16","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.15.25327006","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":39655,"output_tokens":4712,"usd":0.094823,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":13012,"output_tokens":4681,"usd":0.091042,"stage2_stop_reason":"end_turn"},"total_usd":0.185865,"stage1_batch_id":"msgbatch_013LWZZT6MWaqB9qyTSeQBmU","stage2_batch_id":"msgbatch_0194ZzQaTGNpruoNJBbEMbt3","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2009,\n      \"finding\": \"SEC23B is a component of the COPII coat protein complex required for ER-to-Golgi protein transport, and loss-of-function mutations in SEC23B cause congenital dyserythropoietic anemia type II (CDAII). shRNA-mediated suppression of SEC23B in human cells recapitulates the cytokinesis defect characteristic of CDAII, and knockdown of zebrafish sec23b leads to aberrant erythrocyte development, establishing a selective role for SEC23B (vs. its paralog SEC23A) in erythroid differentiation.\",\n      \"method\": \"shRNA knockdown in human cells (cytokinesis phenotype readout), zebrafish sec23b morpholino knockdown, sequencing of patient mutations\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function experiments in two independent model systems (human cells and zebrafish), replicated across two contemporaneous studies identifying SEC23B mutations\",\n      \"pmids\": [\"19561605\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SEC23B encodes a COPII coat component; mutations in SEC23B disturb ER-to-Golgi trafficking, causing hypoglycosylation of erythrocyte membrane proteins (e.g., band 3) characteristic of CDAII. Twelve distinct mutations (missense, frameshift, splicing, nonsense) were identified using a proteomic-genomic approach matching the cytoplasmic RBC proteome to the CDAN2 chromosomal locus.\",\n      \"method\": \"Sanger sequencing of patient cohort, proteomic-genomic mapping approach\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutation identification in 13 patients confirmed by two independent groups; mechanistic inference (ER-Golgi trafficking disruption) supported by cellular phenotype but not directly reconstituted\",\n      \"pmids\": [\"19621418\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Complete SEC23B deficiency in mice causes perinatal death with degeneration of professional secretory tissues (pancreatic acini, salivary glands) but not liver. SEC23B-deficient exocrine pancreas shows absence of zymogen granules, severely distended ER, and activation of the proapoptotic unfolded protein response (UPR), demonstrating that SEC23B is specifically required for ER exit of highly abundant secretory cargo in professional secretory tissues.\",\n      \"method\": \"Germline Sec23b knockout mouse; electron microscopy of pancreatic acini; immunohistochemistry for UPR markers; comparison with salivary gland and liver phenotypes\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean germline KO mouse with defined ultrastructural and molecular phenotype, replicated in multiple tissues with mechanistic pathway (UPR/apoptosis) identified\",\n      \"pmids\": [\"22745161\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Hematopoietic-specific SEC23B deficiency in mice does not produce anemia or other CDAII features. SEC23B-deficient hematopoietic stem cells show no competitive disadvantage in repopulation assays, demonstrating that the erythroid phenotype in human CDAII is not caused by a cell-autonomous defect detectable in the mouse hematopoietic compartment—likely reflecting an evolutionary shift in SEC23 paralog expression.\",\n      \"method\": \"Conditional hematopoietic Sec23b knockout (bone marrow transplantation); competitive repopulation assays; secondary bone marrow transplants\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with competitive repopulation readout, multiple transplant experiments in single rigorous study\",\n      \"pmids\": [\"25071156\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Pancreatic SEC23B deficiency alone is sufficient to explain the perinatal lethality of germline SEC23B-deficient mice. Pancreas-specific SEC23A deficiency does not cause lethality or pancreatic pathology, demonstrating that SEC23B but not SEC23A is essential for murine pancreatic development.\",\n      \"method\": \"Pancreas-specific conditional Sec23b and Sec23a knockouts; BAC transgene rescue of germline Sec23b gene-trap lethality; immunohistochemistry\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — tissue-specific KO with transgene rescue and paralog comparison, multiple genetic controls\",\n      \"pmids\": [\"27297878\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SEC23B is required for normal function of pancreatic acinar cells in adult mice. Tamoxifen-inducible acinar-specific Sec23b deletion in adults causes pancreatic cell loss, decreased zymogen granules, ER alterations (ranging from vesicular ER to massively expanded cisternae with intracisternal granules), induction of ER stress, and increased apoptosis.\",\n      \"method\": \"Tamoxifen-inducible pancreatic acinar-cell-specific Sec23b knockout; electron microscopy; ER stress marker analysis; apoptosis assays; pancreatic weight and DNA/RNA/protein quantification\",\n      \"journal\": \"Molecular biology of the cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — inducible conditional KO with multiple orthogonal readouts (ultrastructure, ER stress, apoptosis, organ weight)\",\n      \"pmids\": [\"28539403\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"SEC23A and SEC23B have indistinguishable intracellular protein interactomes; both can complement yeast Sec23 and rescue zebrafish sec23b deficiency. A Sec23a coding sequence knocked into the murine Sec23b locus completely rescues the lethal SEC23B-deficient pancreatic phenotype, demonstrating functional equivalence. The distinct disease phenotypes of SEC23A/B deficiency across species are explained by evolutionary shifts in transcription program rather than intrinsic biochemical differences.\",\n      \"method\": \"Mass spectrometry interactome comparison; yeast complementation assay; zebrafish transgene rescue; Sec23a-knock-in mouse at Sec23b locus\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (interactome, yeast complementation, zebrafish rescue, knock-in mouse) across independent species/systems\",\n      \"pmids\": [\"30065114\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The F-box protein FBXW5 targets SEC23B for proteasomal degradation, limiting autophagic flux in nutrient-replete conditions. In response to starvation, ULK1 phosphorylates SEC23B on Serine 186, preventing FBXW5 binding and thereby stabilizing SEC23B. Phosphorylated/stabilized SEC23B associates preferentially with SEC24A and SEC24B (not SEC24C or SEC24D) and relocalizes to the ER-Golgi intermediate compartment, promoting autophagosome biogenesis.\",\n      \"method\": \"Co-immunoprecipitation; mass spectrometry; in vitro kinase assay (ULK1 phosphorylation of SEC23B S186); site-directed mutagenesis; proteasome inhibitor rescue; autophagy flux assays; subcellular fractionation/localization\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro kinase assay with mutagenesis, reciprocal Co-IP, multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"30596474\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cancer-associated mutant SEC23B localizes to nucleoli (in addition to ER/Golgi), independently of other COPII proteins and without compromising canonical secretory function. Mutant cells show increased ribosomal protein and translation-related gene expression, enhanced translational capacity under ER stress, and increased UBF transcription factor binding at ribosomal DNA promoters. Mutant SEC23B binds UBF, suggesting a non-canonical COPII-independent function in ribosome biogenesis.\",\n      \"method\": \"Immunofluorescence/confocal microscopy for subcellular localization; Co-immunoprecipitation (SEC23B–UBF interaction); chromatin immunoprecipitation (UBF at rDNA promoter); polysome profiling; gene expression arrays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — reciprocal Co-IP and ChIP with localization data, single lab but multiple orthogonal methods\",\n      \"pmids\": [\"29893852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Wild-type SEC23B localizes to the nucleus (in addition to the ER/Golgi interface) and contains functional nuclear localization and export signals. Under proteasome inhibition, wild-type SEC23B additionally localizes to nucleoli. Unbiased proteomic analysis (mass spectrometry) shows wild-type SEC23B interacts with nuclear proteins and with central components of the ER stress, protein ubiquitination, and EIF2 signaling pathways. SEC23B levels increase in response to ER stress, and a genotype-specific differential interaction between SEC23B and UBA52 (RPL40) was validated.\",\n      \"method\": \"Immunofluorescence for nuclear/nucleolar localization; mass spectrometry proteomics of SEC23B interactome; Co-immunoprecipitation (SEC23B–UBA52); ER stress induction and Western blotting; patient-derived lymphoblastoid cell lines\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — mass spectrometry interactome with Co-IP validation and localization data, single lab\",\n      \"pmids\": [\"33753724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Erythroid-specific deletion of all four Sec23 alleles (both Sec23a and Sec23b) in mice causes mid-embryonic death with features of CDAII; deletion of three alleles produces a milder erythroid defect. In SEC23B-deficient human HUDEP-2 cells, CDAII features upon differentiation are rescued by increased SEC23A expression, demonstrating functional overlap between paralogs in human erythroid cells and proposing SEC23A upregulation as a therapeutic strategy.\",\n      \"method\": \"Erythroid-specific conditional double-KO (Sec23a/Sec23b) mouse; HUDEP-2 SEC23B-KO cells; SEC23A overexpression rescue; erythroid differentiation assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis via compound KO in vivo plus human cell-line rescue experiment with functional readout\",\n      \"pmids\": [\"34818036\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The E109K missense mutation (most common human CDAII mutation) in mice leads to decreased SEC23B protein levels and protein mislocalization. Hemizygosity for E109K combined with a null allele (Sec23bki/ko) causes exocrine pancreatic insufficiency with ER stress and apoptosis, chronic pancreatitis, and severe growth restriction with growth hormone insensitivity; hepatocyte-specific Sec23b deletion does not cause growth restriction, indicating a non-hepatic (pancreatic) origin.\",\n      \"method\": \"Knockin mouse (E109K); hemizygous compound mouse model; pancreas-specific conditional KO; histology; ER stress markers; GH signaling analysis; growth measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple mouse genetic models with tissue-specific deletion controls and molecular pathway analysis\",\n      \"pmids\": [\"34954140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"SEC23B loss-of-function in hepatic cells (HuH7 and HepG2 stably silenced for SEC23B) impairs glycosylation of membrane proteins involved in BMP/SMAD pathway activation (including those needed to sense BMP6), leading to suppression of hepcidin expression and altered iron homeostasis. SEC23A overexpression rescues hepcidin suppression in SEC23B-deficient hepatic cells, confirming functional paralog overlap.\",\n      \"method\": \"Stable SEC23B shRNA silencing in HuH7 and HepG2 cells; BMP/SMAD pathway reporter and Western blot; hepcidin mRNA quantification; BMP6 stimulation assays; SEC23A rescue overexpression; glycosylation analysis\",\n      \"journal\": \"International journal of molecular sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — stable KD in two cell lines with pathway analysis and rescue, single lab\",\n      \"pmids\": [\"35163229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SEC23B deletion in colorectal cancer cells suppresses membrane localization of adhesion proteins EPCAM and CD9, augments cell mobility and invasiveness in vitro and in vivo. SEC23B mutations (premature stop C649T, or transport-impairing C1467G and T488C+G791A+G2153A) inhibit COPII-dependent transport of EPCAM and CD9, attenuating cell adhesion.\",\n      \"method\": \"Whole-exome sequencing of patient samples; SEC23B deletion in CRC cell lines; membrane fractionation for EPCAM/CD9 localization; invasion/migration assays; xenograft mouse model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — KO with cargo localization assay and functional readout, in vitro and in vivo, single lab\",\n      \"pmids\": [\"32123160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"HBV envelope S domain selectively interacts with SEC23B (and SEC24A) among COPII paralogs; silencing of SEC23B (but not other Sec23 isoforms) strongly reduces ER export of HBV envelope and subviral particle secretion. The interaction involves the N-terminal half of SEC24A and a di-arginine motif in the S domain.\",\n      \"method\": \"Yeast-based proteomics; siRNA silencing of Sec23/24 paralogs in HBV-expressing liver cells; subviral particle secretion assay; co-immunoprecipitation/interaction mapping\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — paralog-selective siRNA knockdown with functional secretion readout plus interaction domain mapping, single lab\",\n      \"pmids\": [\"32017353\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A germline heterozygous SEC23B missense variant (p.Val594Gly) associated with Cowden syndrome causes ER-stress-mediated increased cell colony formation, survival, growth, and invasion in a normal thyroid cell line, demonstrating that heterozygous change-of-function SEC23B variants have a cancer-predisposing mechanism distinct from the loss-of-function homozygous mutations causing CDAII.\",\n      \"method\": \"Whole-exome and Sanger sequencing; functional characterization of p.Val594Gly in normal thyroid cell line (NHT cells): colony formation, growth, invasion assays; ER stress marker analysis\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — functional assays in cell line with multiple phenotypic readouts, single lab\",\n      \"pmids\": [\"26522472\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Hypomorphic SEC23B alleles (with reduced but not abolished expression) are associated with milder CDAII phenotypes. The data suggest SEC23A-mediated compensation: when SEC23B expression is merely reduced rather than functionally altered, SEC23A can partially substitute, resulting in less severe clinical presentation.\",\n      \"method\": \"Sequencing of five novel hypomorphic mutations; SEC23B mRNA and protein quantification in patient erythroid precursors; clinical severity correlation\",\n      \"journal\": \"Blood cells, molecules & diseases\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — protein/mRNA quantification in patient samples, inferred SEC23A compensation without direct rescue experiment\",\n      \"pmids\": [\"23453696\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SEC23B is a core component of COPII-coated vesicles that mediates ER-to-Golgi transport of secretory proteins; it is targeted for proteasomal degradation by FBXW5, a process opposed by ULK1-mediated phosphorylation on Ser186 during starvation to promote autophagosome biogenesis, and its canonical transport function is required for professional secretory tissue homeostasis (particularly pancreatic acinar cells), erythroid maturation, hepatic hepcidin regulation, and membrane localization of adhesion molecules, while cancer-associated heterozygous variants additionally drive a non-canonical nucleolar function linked to ribosome biogenesis and ER stress.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SEC23B is a core component of the COPII coat that drives ER-to-Golgi transport of secretory cargo, and its dysfunction underlies congenital dyserythropoietic anemia type II (CDAII), where loss-of-function mutations disrupt trafficking and cause hypoglycosylation of erythrocyte membrane proteins such as band 3 [#0, #1]. The canonical transport function is especially critical in professional secretory tissues: complete SEC23B deficiency in mice causes perinatal death with degeneration of pancreatic acini and salivary glands, loss of zymogen granules, distended ER, and proapoptotic unfolded protein response activation, and acinar-specific or E109K-mutant models reproduce ER stress, apoptosis, and exocrine pancreatic insufficiency [#2, #5, #11]. SEC23B and its paralog SEC23A are biochemically interchangeable—they share interactomes, complement yeast Sec23, and a Sec23a knock-in fully rescues the lethal Sec23b pancreatic phenotype—so the distinct, tissue- and species-specific disease phenotypes reflect divergent paralog expression programs rather than intrinsic functional differences [#6, #10]. Beyond constitutive secretion, SEC23B is regulated to support autophagy: FBXW5 targets it for proteasomal degradation under nutrient-replete conditions, while starvation-activated ULK1 phosphorylates SEC23B on Ser186 to block FBXW5 binding, stabilizing it and redirecting it (with SEC24A/SEC24B) to the ER-Golgi intermediate compartment to promote autophagosome biogenesis [#7]. Its cargo-selective transport role extends to glycosylation-dependent BMP/SMAD signaling and hepcidin regulation in hepatocytes [#12] and to membrane delivery of the adhesion molecules EPCAM and CD9, whose loss augments cancer cell motility [#13]. Cancer-associated heterozygous variants confer a non-canonical, COPII-independent gain of function: mutant SEC23B localizes to nucleoli, binds the rDNA transcription factor UBF, and enhances ribosomal protein expression and translational capacity under ER stress, a mechanism distinct from the recessive loss-of-function CDAII alleles [#8, #15].\",\n  \"teleology\": [\n    {\n      \"year\": 2009,\n      \"claim\": \"Established that SEC23B is a COPII coat component whose loss causes CDAII, defining the gene's disease association and a cell-autonomous erythroid requirement distinct from its paralog SEC23A.\",\n      \"evidence\": \"shRNA knockdown in human cells with cytokinesis readout, zebrafish morpholino knockdown, and patient mutation sequencing; parallel proteomic-genomic mapping linking band 3 hypoglycosylation to the CDAN2 locus\",\n      \"pmids\": [\"19561605\", \"19621418\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of cytokinesis defect not resolved at molecular level\", \"Trafficking disruption inferred from cellular phenotype, not biochemically reconstituted\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Showed that SEC23B is specifically required for ER exit of abundant secretory cargo in professional secretory tissues, explaining perinatal lethality via UPR-driven secretory tissue degeneration.\",\n      \"evidence\": \"Germline Sec23b knockout mouse with EM of pancreatic acini and UPR marker immunohistochemistry, contrasting pancreas/salivary gland versus liver\",\n      \"pmids\": [\"22745161\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mouse lethality does not model the human erythroid phenotype\", \"Cargo specificity in pancreas not defined at the individual-protein level\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Demonstrated that the human CDAII erythroid defect is not recapitulated by cell-autonomous loss in the mouse hematopoietic compartment, pointing toward species-specific paralog usage.\",\n      \"evidence\": \"Conditional hematopoietic Sec23b knockout with competitive bone-marrow repopulation and secondary transplant assays\",\n      \"pmids\": [\"25071156\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not directly identify which paralog compensates in mouse erythroid cells\", \"Human-mouse divergence mechanism inferred, not demonstrated\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Pinpointed the pancreas as the tissue responsible for germline-null lethality and confirmed SEC23B (not SEC23A) is essential for murine pancreatic development.\",\n      \"evidence\": \"Pancreas-specific Sec23b and Sec23a conditional knockouts plus BAC transgene rescue of gene-trap lethality\",\n      \"pmids\": [\"27297878\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Basis of paralog-specific essentiality (expression vs. function) not yet resolved here\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established a continuing requirement for SEC23B in adult acinar cell homeostasis, not just development.\",\n      \"evidence\": \"Tamoxifen-inducible adult acinar-specific Sec23b knockout with EM, ER-stress markers, apoptosis assays, and organ quantification\",\n      \"pmids\": [\"28539403\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific cargo whose mistrafficking drives ER stress not identified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved whether SEC23A and SEC23B differ intrinsically: they are biochemically interchangeable, so disease phenotype divergence stems from transcriptional program differences across tissues and species.\",\n      \"evidence\": \"Mass spectrometry interactome comparison, yeast complementation, zebrafish rescue, and a Sec23a knock-in at the Sec23b locus rescuing the pancreatic phenotype\",\n      \"pmids\": [\"30065114\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulatory basis of paralog expression switching not mapped\", \"Does not address non-canonical functions of either paralog\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Uncovered post-translational regulation coupling SEC23B abundance to nutrient status, linking COPII machinery to autophagosome biogenesis.\",\n      \"evidence\": \"Co-IP, mass spectrometry, in vitro ULK1 kinase assay on Ser186, site-directed mutagenesis, proteasome rescue, and autophagy flux assays\",\n      \"pmids\": [\"30596474\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SEC23B at the ERGIC mechanistically drives autophagosome formation is not detailed\", \"Physiological contexts where this pathway operates not defined\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identified a non-canonical, COPII-independent nucleolar function for cancer-associated mutant SEC23B in ribosome biogenesis, separating change-of-function from loss-of-function mechanisms.\",\n      \"evidence\": \"Immunofluorescence localization, SEC23B-UBF Co-IP, ChIP at rDNA promoters, polysome profiling, and gene expression arrays in mutant cells\",\n      \"pmids\": [\"29893852\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab data without independent replication\", \"Direct biochemical basis of UBF regulation by SEC23B not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrated that a heterozygous Cowden-associated SEC23B variant acts via an ER-stress-mediated cancer-predisposing mechanism distinct from recessive CDAII alleles.\",\n      \"evidence\": \"Sequencing plus colony formation, growth, invasion, and ER-stress marker assays for p.Val594Gly in a normal thyroid cell line\",\n      \"pmids\": [\"26522472\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single cell-line system, no in vivo confirmation\", \"Link between ER stress and oncogenic phenotype mechanistically incomplete\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extended SEC23B's cargo-selective transport role to adhesion molecule delivery and viral particle secretion, showing functional consequences for cancer cell behavior and HBV egress.\",\n      \"evidence\": \"SEC23B deletion/mutation in CRC cells with EPCAM/CD9 membrane fractionation, invasion/xenograft assays; paralog-selective siRNA in HBV-expressing cells with secretion and interaction-mapping assays\",\n      \"pmids\": [\"32123160\", \"32017353\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cargo selectivity determinants for EPCAM/CD9 versus HBV S domain not unified\", \"Single-lab findings for each cargo\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed paralog functional overlap in human erythroid cells and identified nuclear/nucleolar localization and ER-stress-responsive interactions of even wild-type SEC23B.\",\n      \"evidence\": \"Erythroid-specific Sec23a/Sec23b compound knockout mice, HUDEP-2 SEC23B-KO rescued by SEC23A overexpression; SEC23B nuclear localization signals, mass spectrometry interactome, and SEC23B-UBA52 Co-IP in patient lymphoblastoid lines\",\n      \"pmids\": [\"34818036\", \"33753724\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of nuclear localization for wild-type SEC23B not defined\", \"Therapeutic SEC23A upregulation strategy not validated in vivo for human disease\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Modeled the most common human CDAII mutation in mice, linking E109K to protein destabilization/mislocalization, pancreatic insufficiency, and growth hormone insensitivity of pancreatic origin.\",\n      \"evidence\": \"E109K knock-in and hemizygous compound mouse models with tissue-specific deletion controls, histology, ER-stress markers, and GH signaling analysis\",\n      \"pmids\": [\"34954140\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not reconcile pancreatic-dominant mouse phenotype with erythroid-dominant human disease\", \"Molecular link between SEC23B loss and GH insensitivity not fully defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Connected SEC23B-dependent glycosylation to BMP/SMAD-driven hepcidin regulation, defining a hepatic role in iron homeostasis.\",\n      \"evidence\": \"Stable SEC23B silencing in HuH7/HepG2 with BMP/SMAD reporters, hepcidin mRNA quantification, glycosylation analysis, and SEC23A rescue\",\n      \"pmids\": [\"35163229\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific BMP-sensing membrane protein dependent on SEC23B not definitively identified\", \"In vivo confirmation of hepatic iron phenotype lacking\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How wild-type SEC23B's nuclear/nucleolar pool and its UBF/UBA52 interactions integrate with its canonical COPII transport function, and whether this constitutes a regulated physiological switch versus a mutation-specific activity, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of SEC23B engaging nucleolar partners\", \"Whether nuclear function is regulated in normal cells or only emerges with variants is unclear\", \"Mechanism connecting ER stress to SEC23B nuclear accumulation undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 13]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [0, 2, 7]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 7]},\n      {\"term_id\": \"GO:0005730\", \"supporting_discovery_ids\": [8, 9]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [9]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [0, 2, 13]},\n      {\"term_id\": \"R-HSA-9612973\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [2, 5, 9]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [13, 14]}\n    ],\n    \"complexes\": [\"COPII coat\"],\n    \"partners\": [\"SEC24A\", \"SEC24B\", \"FBXW5\", \"ULK1\", \"UBF\", \"UBA52\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}