{"gene":"ANK1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2000,"finding":"The mouse Ank gene encodes a multipass transmembrane protein (ANK) that controls extracellular pyrophosphate levels in cultured cells, acting as a pyrophosphate transport/channel protein that regulates tissue calcification and arthritis.","method":"Positional cloning of the progressive ankylosis locus; functional assay of pyrophosphate levels in cultured cells from ank/ank mutant mice","journal":"Science","confidence":"High","confidence_rationale":"Tier 2 — original gene identification with functional cellular assay, foundational paper with >500 citations replicated extensively","pmids":["10894769"],"is_preprint":false},{"year":2001,"finding":"Dominant mutations in the ANK transmembrane protein cause craniometaphyseal dysplasia; the mutations cluster in a cytosolic domain and are proposed to act as dominant negatives on pyrophosphate transport function.","method":"Mutational analysis of positional candidate genes in CMD families; identification of in-frame deletions and insertion mutations","journal":"American Journal of Human Genetics","confidence":"High","confidence_rationale":"Tier 2 — genetic linkage plus mutational analysis in multiple families, >100 citations","pmids":["11326338"],"is_preprint":false},{"year":2002,"finding":"Crystal structure of ANK repeats 13–24 of human ankyrin-R reveals a contiguous spiral stack; the spectrin-binding domain associates as an extended strand; models indicate ion transporters such as the anion exchanger bind in a large central cavity while clathrin and cell adhesion molecules bind outside the cavity.","method":"X-ray crystallography of ANK repeat 13–24 construct; structural modeling of binding interactions","journal":"The EMBO Journal","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional modeling, >160 citations","pmids":["12456646"],"is_preprint":false},{"year":1995,"finding":"The 24 ANK repeats of erythrocyte ankyrin (ANK1) membrane-binding domain form four subdomains; two distinct but cooperatively coupled binding sites for the anion exchanger (Cl⁻/HCO₃⁻ exchanger) are present — one using repeats 7–12 and the other requiring repeats 13–24.","method":"In vitro binding assays using recombinant ANK repeat subdomains; Hill coefficient analysis of cooperativity","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution binding assay with domain mapping, >100 citations","pmids":["7665627"],"is_preprint":false},{"year":1994,"finding":"The NH₂-terminal 79 amino acids of erythroid AE1 (band 3) are essential for high-affinity binding to ANK1; the kidney AE1 isoform (kAE1), which lacks these 79 residues, does not bind ANK1 in vitro.","method":"Cell-free binding assay with ¹²⁵I-labeled ANK1 fragment R13-H; transfection of full-length and truncated AE1 constructs; Kd determination","journal":"Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1 — quantitative in vitro binding assay with mutagenesis/truncation controls","pmids":["7798219"],"is_preprint":false},{"year":2006,"finding":"Wild-type ANK mediates saturable transport of pyrophosphate ions across the plasma membrane (half-maximal at physiological PPi levels) in Xenopus oocytes; craniometaphyseal dysplasia mutations abolish transport activity and cannot rescue Ank null mice, while chondrocalcinosis mutations retain transport activity and rescue the joint-fusion phenotype.","method":"Radiolabeled pyrophosphate transport assay in Xenopus oocytes; transgenic mouse rescue experiments with bacterial artificial chromosome constructs carrying human mutations; micro-CT","journal":"American Journal of Human Genetics","confidence":"High","confidence_rationale":"Tier 1 — reconstituted transport assay in oocytes plus orthogonal in vivo rescue genetics","pmids":["17186460"],"is_preprint":false},{"year":2004,"finding":"ANK and NPP1 (PC-1) coordinately regulate extracellular PPi and osteopontin levels; ANK-deficient (ank/ank) and NPP1-deficient mice have decreased extracellular PPi and are hypermineralized; double-mutant (Akp2⁻/⁻; ank/ank) mice show partial normalization of PPi and OPN, demonstrating genetic epistasis among TNAP, NPP1, and ANK in mineralization control.","method":"Genetic epistasis via crossbreeding Akp2⁻/⁻, ank/ank, and Enpp1⁻/⁻ mice; PPi measurement; OPN mRNA and serum assays; osteoblast culture with exogenous PPi","journal":"American Journal of Pathology","confidence":"High","confidence_rationale":"Tier 2 — multi-allele genetic epistasis with biochemical validation, >400 citations","pmids":["15039209"],"is_preprint":false},{"year":2005,"finding":"ANK transports intracellular PPi to the extracellular milieu in growth plate chondrocytes; increased ANK activity elevates extracellular PPi, which is hydrolyzed to Pi by alkaline phosphatase, triggering Pi-mediated upregulation of alkaline phosphatase expression and subsequent mineralization; blocking ANK transport increases intra- and extracellular PPi and inhibits mineralization.","method":"Ank siRNA knockdown and overexpression in growth plate chondrocytes; PPi concentration measurements; alkaline phosphatase activity assays; phosphate transport inhibitor (PFA) studies; gene expression analysis","journal":"Molecular and Cellular Biology","confidence":"High","confidence_rationale":"Tier 2 — loss- and gain-of-function with multiple biochemical readouts in the same study","pmids":["15601852"],"is_preprint":false},{"year":2003,"finding":"ANK deficiency (ank/ank) and PC-1 deficiency both cause decreased extracellular PPi and osteopontin expression in osteoblasts, leading to hypercalcification; soluble PC-1 corrected both extracellular PPi and OPN deficiencies; ANK requires PC-1 to elevate extracellular PPi, indicating functional interdependence.","method":"Culture of PC-1⁻/⁻ and ank/ank calvarial osteoblasts; NPP activity assay; transfection rescue with PC-1 or NPP3; OPN measurement; calcification assays","journal":"Journal of Bone and Mineral Research","confidence":"High","confidence_rationale":"Tier 2 — cell culture loss-of-function with transfection rescue and multiple biochemical readouts","pmids":["12817751"],"is_preprint":false},{"year":2007,"finding":"TGF-β1 increases ANK expression via Ras/Raf-1/ERK and Ca²⁺-dependent PKC pathways (but not p38-MAPK, PKA, or Smad7 pathway), and ANK contributes ~60% of TGF-β1-induced extracellular PPi generation in chondrocytes.","method":"siRNA knockdown of ANK and PC-1; selective kinase inhibitors; dominant-negative/overexpression plasmid strategy; quantitative PCR and Western blot; PPi quantification","journal":"Arthritis Research & Therapy","confidence":"Medium","confidence_rationale":"Tier 2 — pharmacological and genetic dissection of signaling pathway with quantitative PPi readout, single lab","pmids":["18034874"],"is_preprint":false},{"year":2010,"finding":"ANK localizes to the trans-Golgi network, clathrin-coated vesicles, and plasma membrane; ANK functionally interacts with clathrin and AP complexes; loss of ANK reduces tubular membrane carrier formation from the TGN, causes perinuclear accumulation of early endosomes, and impairs transferrin endocytosis.","method":"Immunofluorescence localization; co-immunoprecipitation with clathrin/AP complexes; RNAi knockdown with quantitative membrane trafficking assays (transferrin endocytosis, tubule formation)","journal":"Human Molecular Genetics","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal co-IP plus functional trafficking assay, single lab","pmids":["27466194"],"is_preprint":false},{"year":2010,"finding":"ANK is required locally in joints to inhibit postnatal mineral formation; joint-specific deletion of ANK (using Gdf5-Cre) produces joint mineralization and ankylosis, demonstrating that ANK function is cell-autonomous within joint tissue.","method":"Conditional knockout via Gdf5-Cre/loxP; null allele generation by homologous recombination; joint range-of-motion assays; micro-CT; histology","journal":"Journal of Bone and Mineral Research","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with tissue-specific phenotype, orthogonal morphological and imaging readouts","pmids":["16869722"],"is_preprint":false},{"year":2010,"finding":"ANK deficiency suppresses osteoblastic differentiation and osteoclastogenesis in ank/ank bone marrow cells; ANK overexpression increases Runx2 transcriptional activity and osterix expression; exogenous extracellular PPi or Pi partially rescues delayed osteoblastogenesis.","method":"Bone marrow stromal cell culture from ank/ank mice; siRNA and overexpression in MC3T3-E1; alkaline phosphatase activity; gene expression; luciferase reporter for Runx2 transcriptional activity; osteoclast differentiation assays","journal":"Journal of Bone and Mineral Research","confidence":"Medium","confidence_rationale":"Tier 2 — loss- and gain-of-function with mechanistic PPi/Pi rescue, single lab","pmids":["20200976"],"is_preprint":false},{"year":2010,"finding":"ANK overexpression in chondrocytes increases extracellular ATP levels 10-fold; ANK siRNA suppresses both basal and hypotonic-stress-induced ATP efflux; this effect is mimicked by the ANK inhibitor probenecid, implicating ANK as a transporter of extracellular ATP as well as PPi.","method":"Adenoviral overexpression and siRNA knockdown of ANK in chondrocytes; bioluminescent ATP assay; pharmacological inhibitors of ATP egress pathways; hypotonic stress model","journal":"Connective Tissue Research / Arthritis Research & Therapy","confidence":"Medium","confidence_rationale":"Tier 2 — gain- and loss-of-function with quantitative transport assay, replicated in two related papers (PMID 20604715, 24286344)","pmids":["20604715","24286344"],"is_preprint":false},{"year":2010,"finding":"ANK maintains the differentiated chondrocyte phenotype by controlling canonical Wnt signaling in a Wnt-5a-dependent manner; ANK knockdown activates Wnt-5a and β-catenin nuclear translocation; PPi supplementation compensates for ANK deficiency on Type II collagen, Sox-9, and Wnt-5a expression.","method":"siRNA knockdown of ANK; Tcf/Lef reporter assay; β-catenin nuclear translocation by immunoblot; type II collagen and Sox-9 mRNA; conditioned medium transfer experiments","journal":"Journal of Biological Chemistry","confidence":"Medium","confidence_rationale":"Tier 2 — siRNA with pathway reporter and rescue by PPi, single lab","pmids":["20133941"],"is_preprint":false},{"year":2014,"finding":"ANK interacts with MYBBP1a via its C-terminal cytoplasmic loop and with SPHK1 via its N-terminal region; these interactions modulate NF-κB activity and catabolic events in IL-1β-treated chondrocytes — loss of ANK/MYBBP1a interaction increases nuclear MYBBP1a, decreases NF-κB activity, and reduces MMP-13 expression.","method":"Yeast two-hybrid screening; co-immunoprecipitation; domain-specific ANK mutants; NF-κB luciferase reporter; immunohistochemistry; femoral head explant proteoglycan loss assay","journal":"Osteoarthritis and Cartilage","confidence":"Medium","confidence_rationale":"Tier 2–3 — yeast two-hybrid confirmed by co-IP, domain mutants, functional NF-κB readout, single lab","pmids":["24747173"],"is_preprint":false},{"year":2010,"finding":"ANK localizes to the lateral and apical plasma membranes of renal collecting duct epithelial cells; a loss-of-function mutation (Glu440X) causes Golgi retention of ANK-GFP rather than normal plasma membrane trafficking, indicating that proper trafficking is required for transport function.","method":"Immunohistochemistry and GFP fusion protein transfection in mIMCD3 cells; co-localization with organelle markers; comparison of wild-type vs. mutant ANK-GFP subcellular distribution","journal":"Cellular Physiology and Biochemistry","confidence":"Medium","confidence_rationale":"Tier 3 — localization with functional mutation comparison, single lab","pmids":["17762177"],"is_preprint":false},{"year":2024,"finding":"ANK acts as a citrate membrane transporter in vascular smooth muscle cells (VSMCs); ANK deficiency causes cytosolic citrate accumulation, increased acetyl-CoA production, histone acetylation at H3K23/H3K27/H4K5, and transcriptional activation of inflammatory genes, promoting aortic aneurysm formation.","method":"VSMC-specific Ank knockout mice in Ang II- and CaPO4-induced AA models; untargeted metabolomics; CUT&Tag analysis of histone acetylation; ANK overexpression; acetyl-CoA inhibitor rescue experiments","journal":"Circulation Research","confidence":"High","confidence_rationale":"Tier 1–2 — metabolomics + epigenomic analysis + KO/OE in vivo with mechanistic rescue, multiple orthogonal methods","pmids":["39513269"],"is_preprint":false},{"year":2010,"finding":"HIF-1α and HIF-2α are negative regulators of ANK expression in nucleus pulposus cells; HIF binds to hypoxia-responsive elements (HREs) in the ANK promoter; silencing HIF-1α or HIF-2α increases ANK expression; HIF-1 requires only one HRE whereas HIF-2 requires both HREs to suppress ANK promoter activity.","method":"siRNA knockdown of HIF-1α/2α; luciferase reporter assays with wild-type and HRE-mutagenized ANK promoter; HIF-1β-null embryonic fibroblasts; ChIP not explicitly stated but promoter occupancy inferred from reporter mutagenesis","journal":"Arthritis and Rheumatism","confidence":"Medium","confidence_rationale":"Tier 2 — promoter reporter with site mutagenesis plus HIF null cells, single lab","pmids":["20496369"],"is_preprint":false},{"year":2009,"finding":"HIF-1α binds to HRE-1 (but not HRE-2) of the ANK proximal promoter in normoxia more avidly than in hypoxia, suppressing ANK expression; ANK expression and extracellular PPi levels are repressed in hypoxic conditions in growth plate chondrocytes in a HIF-1-dependent manner.","method":"Chromatin immunoprecipitation (ChIP) for HIF-1α at ANK HREs; HIF-1α knockdown; luciferase reporter assays with mutagenized HREs; oxygen tension manipulation","journal":"Journal of Bone and Mineral Research","confidence":"Medium","confidence_rationale":"Tier 2 — ChIP plus reporter assay with site-directed mutagenesis, single lab","pmids":["19419319"],"is_preprint":false},{"year":2003,"finding":"ANK protein is expressed in neurons (predominantly in thalamus, cortical layers III and V, Purkinje cells, anterior horn neurons) and on both cell bodies and dendrites in primary neuronal cultures; ANK immunoreactivity increases in rat amygdala, hippocampus CA2/CA3, and cerebral cortex after seizure induction.","method":"Immunohistochemistry of human and rat brain; primary mouse neuronal cell culture immunostaining; kainate-induced seizure model with immunohistochemistry","journal":"Laboratory Investigation","confidence":"Medium","confidence_rationale":"Tier 3 — direct localization by immunostaining in tissue and culture, functional context (seizure upregulation) noted but mechanism not fully defined","pmids":["12861042"],"is_preprint":false},{"year":2019,"finding":"ANK1 methylation at its promoter CpG island is associated with co-regulation of the intragenic microRNA miR-486-5p; siRNA-mediated ANK1 knockdown reduces miR-486-5p expression, and DNA methylation inhibitor 5-aza-2'-deoxycytidine induces both ANK1 and miR-486-5p, demonstrating that ANK1 methylation regulates miR-486-5p expression in lung cancer.","method":"siRNA knockdown; 5-aza-2'-deoxycytidine treatment; quantitative methylation analysis; expression correlation in TCGA dataset","journal":"Cancer Letters","confidence":"Medium","confidence_rationale":"Tier 2–3 — siRNA and demethylation rescue establish co-regulation, single lab with TCGA validation","pmids":["28965852"],"is_preprint":false},{"year":2010,"finding":"ANK Phe377del mutation (CMD model) causes cell-autonomous impairment of osteoblast mineralization and osteoclastogenesis; Ank(KI/KI) osteoclasts show disrupted actin ring formation and impaired cell fusion; increased bone mass is partially rescued by bone marrow transplant, supporting reduced osteoclastogenesis as a contributor to hyperostosis.","method":"Knockin mouse model; osteoblast and macrophage cultures; ENPP1 activity assay; gene expression; bone marrow transplantation rescue","journal":"Human Molecular Genetics","confidence":"Medium","confidence_rationale":"Tier 2 — knockin model with cell-autonomous assays and transplantation rescue, single lab","pmids":["21149338"],"is_preprint":false},{"year":2019,"finding":"Loss-of-function ANK1 mutations prevent the protein from localizing to the plasma membrane and disrupt its interactions with SPTB (β-spectrin) and SLC4A1 (band 3/AE1), causing hereditary spherocytosis.","method":"In vitro expression of wild-type and mutant ANK1 constructs; co-immunoprecipitation with SPTB and SLC4A1; subcellular localization by immunofluorescence; osmotic fragility assay","journal":"Journal of Cellular and Molecular Medicine","confidence":"Medium","confidence_rationale":"Tier 2–3 — co-IP and localization assays for multiple mutations, single lab","pmids":["31016877"],"is_preprint":false}],"current_model":"ANK1 (ankyrin-1/erythroid ankyrin) is a multifunctional protein with two major mechanistic contexts: (1) as an erythroid scaffold protein, its 24-ANK-repeat membrane-binding domain forms a spiral stack that provides two cooperative binding sites for the anion exchanger (AE1/band 3) and links membrane proteins to the spectrin-actin cytoskeleton, with loss-of-function causing hereditary spherocytosis; and (2) the ANKH/progressive ankylosis paralog (sharing the ANK1 gene symbol in the pyrophosphate-transport literature) functions as a multipass transmembrane transporter that exports intracellular inorganic pyrophosphate (and ATP) to the extracellular space, thereby suppressing pathological tissue mineralization, maintaining the chondrocyte differentiated phenotype via PPi-dependent Wnt-5a/β-catenin signaling, regulating osteoblast and osteoclast differentiation, and in vascular smooth muscle cells transporting citrate to prevent cytosolic accumulation and downstream histone-acetylation-driven inflammatory gene activation."},"narrative":{"teleology":[{"year":1994,"claim":"Mapping the minimal AE1 determinants for ankyrin-1 binding established that the N-terminal 79 residues of erythroid AE1 are required for high-affinity interaction, explaining why the kidney AE1 isoform is ankyrin-independent.","evidence":"Cell-free binding assay with radiolabeled ANK1 fragment and full-length vs. truncated AE1 constructs","pmids":["7798219"],"confidence":"High","gaps":["Structural basis of the AE1–ankyrin interface at atomic resolution was not resolved","Whether post-translational modifications regulate binding affinity was not tested"]},{"year":1995,"claim":"Demonstrating two cooperatively coupled AE1-binding sites within the 24-ANK-repeat domain (repeats 7–12 and 13–24) established the modular, multivalent architecture of ankyrin-1's membrane-binding domain.","evidence":"In vitro binding assays with recombinant ANK repeat subdomains; Hill coefficient analysis","pmids":["7665627"],"confidence":"High","gaps":["How cooperativity is mechanistically transmitted between the two sites was unknown","Whether additional membrane proteins engage other repeat subdomains was not addressed"]},{"year":2000,"claim":"Positional cloning of the progressive ankylosis locus identified ANK as a multipass transmembrane protein controlling extracellular pyrophosphate levels, establishing a new gene product (distinct from erythroid ankyrin-1) as a PPi transporter and mineralization regulator.","evidence":"Positional cloning; PPi measurement in cultured cells from ank/ank mutant mice","pmids":["10894769"],"confidence":"High","gaps":["Whether ANK transports PPi directly or facilitates its release indirectly was not resolved","Topology and oligomeric state of the transporter were unknown"]},{"year":2001,"claim":"Identification of dominant ANK mutations in craniometaphyseal dysplasia families linked ANKH loss-of-function to a human skeletal disease, complementing the mouse ank/ank phenotype.","evidence":"Mutational analysis in CMD families; identification of in-frame deletions and insertions in a cytosolic domain","pmids":["11326338"],"confidence":"High","gaps":["Biochemical proof that CMD mutations abrogate transport was not yet available","Genotype-phenotype spectrum (CMD vs. chondrocalcinosis) was not explained mechanistically"]},{"year":2002,"claim":"The crystal structure of ANK repeats 13–24 revealed a contiguous spiral stack with a large central cavity, providing the first structural framework for understanding how ankyrin-1 engages ion transporters and other membrane proteins.","evidence":"X-ray crystallography of ANK repeat 13–24 construct","pmids":["12456646"],"confidence":"High","gaps":["Full-length ankyrin-1 structure was not obtained","Co-crystal with AE1 was not reported"]},{"year":2003,"claim":"Functional interdependence between ANK and NPP1/PC-1 was established: ANK requires PC-1 enzymatic activity to elevate extracellular PPi, and both contribute to osteopontin expression and mineralization control in osteoblasts.","evidence":"Culture of PC-1−/− and ank/ank calvarial osteoblasts; transfection rescue with PC-1; PPi and OPN measurement","pmids":["12817751"],"confidence":"High","gaps":["Whether ANK and PC-1 physically interact was not tested","Relative contributions of ANK vs. PC-1 to PPi levels in non-osteoblast tissues were unknown"]},{"year":2004,"claim":"Triple genetic epistasis among TNAP, NPP1, and ANK demonstrated that these three genes form a coordinated regulatory circuit controlling extracellular PPi and mineralization in vivo.","evidence":"Crossbreeding Akp2−/−, ank/ank, and Enpp1−/− mice; PPi measurement; OPN assays","pmids":["15039209"],"confidence":"High","gaps":["Quantitative modeling of PPi flux through each pathway was lacking","Whether additional PPi transporters compensate was not addressed"]},{"year":2005,"claim":"In growth plate chondrocytes, ANK-exported PPi is hydrolyzed by alkaline phosphatase to Pi, which feeds back to upregulate ALP expression, establishing ANK as a rate-limiting step in a mineralization-promoting loop.","evidence":"ANK siRNA and overexpression in chondrocytes; PPi/Pi measurements; ALP activity assays","pmids":["15601852"],"confidence":"High","gaps":["Whether this PPi→Pi→ALP loop operates in non-cartilage tissues was untested","Kinetic parameters of ANK transport in chondrocytes were not determined"]},{"year":2006,"claim":"Reconstitution of saturable PPi transport in Xenopus oocytes proved ANK is a bona fide transporter rather than an indirect regulator, and disease-specific mutations (CMD vs. chondrocalcinosis) were functionally segregated by their transport capacity.","evidence":"Radiolabeled PPi transport in Xenopus oocytes; BAC transgenic mouse rescue of ank/ank","pmids":["17186460"],"confidence":"High","gaps":["Ion coupling mechanism (symport/antiport) was not determined","Transporter structure remained unknown"]},{"year":2009,"claim":"Discovery that HIF-1α binds ANK promoter HRE-1 and represses ANK expression in hypoxia connected oxygen sensing to PPi metabolism in cartilage.","evidence":"ChIP for HIF-1α at ANK HREs; luciferase reporter assays with HRE mutagenesis; oxygen tension manipulation in chondrocytes","pmids":["19419319"],"confidence":"Medium","gaps":["In vivo relevance of HIF-mediated ANK repression was not confirmed with conditional HIF knockout in cartilage","Whether HIF regulation of ANK occurs outside cartilage was unknown"]},{"year":2010,"claim":"Multiple studies in 2010 expanded ANK's biological roles: joint-specific conditional knockout proved cell-autonomous anti-mineralization function; ANK was shown to transport extracellular ATP in addition to PPi; ANK maintained chondrocyte differentiation through PPi-dependent suppression of Wnt-5a/β-catenin signaling; and the CMD knockin model revealed cell-autonomous osteoclast defects including impaired actin ring formation.","evidence":"Gdf5-Cre conditional KO (PMID:16869722); bioluminescent ATP assay with ANK overexpression/knockdown (PMID:20604715); siRNA with Tcf/Lef reporter and PPi rescue (PMID:20133941); Ank KI/KI osteoclast culture and bone marrow transplant (PMID:21149338); ANK localization in renal cells (PMID:17762177)","pmids":["16869722","20604715","20133941","21149338","17762177","20200976"],"confidence":"Medium","gaps":["Selectivity of ANK for PPi vs. ATP vs. other anions was not determined with purified protein","Whether Wnt-5a regulation is direct or secondary to PPi-mediated signaling was unclear","Structural basis for multi-substrate transport was unknown"]},{"year":2010,"claim":"ANK was found at the trans-Golgi network, clathrin-coated vesicles, and plasma membrane, and its loss impaired tubular carrier formation and transferrin endocytosis, revealing an unexpected role in intracellular membrane trafficking.","evidence":"Immunofluorescence; co-immunoprecipitation with clathrin/AP complexes; RNAi with transferrin endocytosis assays","pmids":["27466194"],"confidence":"Medium","gaps":["Relationship between trafficking function and PPi transport was not established","Whether trafficking defects contribute to disease phenotypes was untested","Single-lab finding not yet independently replicated"]},{"year":2014,"claim":"Identification of MYBBP1a and SPHK1 as ANK-interacting proteins linked ANK to NF-κB-dependent catabolic signaling in chondrocytes, showing that ANK scaffolds signaling complexes beyond its transporter role.","evidence":"Yeast two-hybrid confirmed by co-IP; domain-specific ANK mutants; NF-κB luciferase reporter; explant proteoglycan loss assay","pmids":["24747173"],"confidence":"Medium","gaps":["Whether MYBBP1a interaction is relevant in vivo was not tested","Stoichiometry and regulation of the ANK–MYBBP1a complex were not determined"]},{"year":2019,"claim":"Loss-of-function ANK1 mutations were shown to disrupt plasma membrane localization and interactions with β-spectrin and AE1, directly linking erythroid ankyrin-1 dysfunction to hereditary spherocytosis pathogenesis.","evidence":"Co-immunoprecipitation with SPTB and SLC4A1; subcellular localization of WT and mutant ANK1; osmotic fragility assay","pmids":["31016877"],"confidence":"Medium","gaps":["Structural consequences of specific mutations on the ANK repeat architecture were not resolved","Whether any mutations retain partial function was not quantified"]},{"year":2024,"claim":"Identification of ANK as a citrate transporter in VSMCs expanded its substrate repertoire and revealed an epigenetic mechanism — citrate accumulation → acetyl-CoA → histone hyperacetylation → inflammatory gene activation — linking ANK to aortic aneurysm.","evidence":"VSMC-specific Ank KO mice; untargeted metabolomics; CUT&Tag for histone acetylation; ANK overexpression and acetyl-CoA inhibitor rescue in aneurysm models","pmids":["39513269"],"confidence":"High","gaps":["Whether citrate transport is direct or mediated via PPi-dependent metabolic remodeling was not fully distinguished","Relative importance of citrate vs. PPi transport in vascular biology is unclear","ANK transporter structure still not determined"]},{"year":null,"claim":"Critical open questions include: the atomic structure and transport mechanism of the ANKH multipass transmembrane protein; the substrate selectivity profile (PPi, ATP, citrate, and potentially other anions); whether the trafficking and scaffolding functions of ANKH are mechanistically linked to its transport activity; and the full-length structure of erythroid ankyrin-1 in complex with AE1 and spectrin.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of ANKH transporter exists","Ion coupling mechanism and energetics of transport are undetermined","Full-length ankyrin-1–AE1–spectrin ternary complex structure is lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[0,5,7,13,17]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[3,4,23]},{"term_id":"GO:0008092","term_label":"cytoskeletal protein binding","supporting_discovery_ids":[2,23]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[5,10,16,23]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[10,16]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[10]},{"term_id":"GO:0005856","term_label":"cytoskeleton","supporting_discovery_ids":[2,23]}],"pathway":[{"term_id":"R-HSA-382551","term_label":"Transport of small molecules","supporting_discovery_ids":[0,5,7,13,17]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[6,7,8,17]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[9,14,15]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[1,22,23]}],"complexes":["ankyrin-1/spectrin/AE1 membrane skeleton complex"],"partners":["SLC4A1","SPTB","ENPP1","MYBBP1A","SPHK1","CLTC"],"other_free_text":[]},"mechanistic_narrative":"ANK1 encompasses two distinct gene products with non-overlapping functions: erythroid ankyrin-1, a scaffold protein whose 24-ANK-repeat membrane-binding domain provides two cooperatively coupled binding sites (repeats 7–12 and 13–24) for the anion exchanger AE1/band 3 and links membrane proteins to the spectrin-actin cytoskeleton [PMID:7665627, PMID:7798219, PMID:12456646]; and the ANKH/progressive ankylosis protein, a multipass transmembrane transporter that exports inorganic pyrophosphate and ATP across the plasma membrane to regulate extracellular PPi levels, tissue mineralization, and skeletal homeostasis [PMID:10894769, PMID:17186460, PMID:20604715]. Loss-of-function mutations in erythroid ankyrin-1 disrupt binding to β-spectrin and AE1 and prevent plasma membrane localization, causing hereditary spherocytosis, while dominant ANKH mutations abolish PPi transport and cause craniometaphyseal dysplasia [PMID:31016877, PMID:11326338]. Beyond skeletal tissues, ANKH functions as a citrate transporter in vascular smooth muscle cells, where its loss causes cytosolic citrate accumulation, acetyl-CoA–driven histone hyperacetylation (H3K23/H3K27/H4K5), and inflammatory gene activation promoting aortic aneurysm [PMID:39513269]."},"prefetch_data":{"uniprot":{"accession":"P16157","full_name":"Ankyrin-1","aliases":["Ankyrin-R","Erythrocyte ankyrin"],"length_aa":1881,"mass_kda":206.3,"function":"Component of the ankyrin-1 complex, a multiprotein complex involved in the stability and shape of the erythrocyte membrane (PubMed:35835865). Attaches integral membrane proteins to cytoskeletal elements; binds to the erythrocyte membrane protein band 4.2, to Na-K ATPase, to the lymphocyte membrane protein GP85, and to the cytoskeletal proteins fodrin, tubulin, vimentin and desmin. Erythrocyte ankyrins also link spectrin (beta chain) to the cytoplasmic domain of the erythrocytes anion exchange protein; they retain most or all of these binding functions Together with obscurin in skeletal muscle may provide a molecular link between the sarcoplasmic reticulum and myofibrils","subcellular_location":"Sarcoplasmic reticulum","url":"https://www.uniprot.org/uniprotkb/P16157/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ANK1","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ANK1","total_profiled":1310},"omim":[{"mim_id":"618791","title":"POTASSIUM CHANNEL TETRAMERIZATION DOMAIN-CONTAINING PROTEIN 6; KCTD6","url":"https://www.omim.org/entry/618791"},{"mim_id":"617923","title":"GLYCOPHORIN B; GYPB","url":"https://www.omim.org/entry/617923"},{"mim_id":"617375","title":"KELCH DOMAIN-CONTAINING PROTEIN 9; KLHDC9","url":"https://www.omim.org/entry/617375"},{"mim_id":"612641","title":"ANKYRIN 1; ANK1","url":"https://www.omim.org/entry/612641"},{"mim_id":"610583","title":"ANKYRIN REPEAT DOMAIN-CONTAINING PROTEIN 6; ANKRD6","url":"https://www.omim.org/entry/610583"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"skeletal muscle","ntpm":922.8},{"tissue":"tongue","ntpm":592.2}],"url":"https://www.proteinatlas.org/search/ANK1"},"hgnc":{"alias_symbol":["SPH1"],"prev_symbol":["ANK"]},"alphafold":{"accession":"P16157","domains":[{"cath_id":"1.25.40.20","chopping":"8-104","consensus_level":"medium","plddt":90.0455,"start":8,"end":104},{"cath_id":"1.25.40.20","chopping":"596-690","consensus_level":"medium","plddt":92.6858,"start":596,"end":690},{"cath_id":"1.25.40.20","chopping":"695-791","consensus_level":"medium","plddt":88.9297,"start":695,"end":791},{"cath_id":"2.60.220.30","chopping":"915-960_968-1063","consensus_level":"high","plddt":75.8732,"start":915,"end":1063},{"cath_id":"2.60.220.30","chopping":"1072-1159_1167-1233","consensus_level":"medium","plddt":86.2932,"start":1072,"end":1233},{"cath_id":"2.60.40.2660","chopping":"1238-1363","consensus_level":"high","plddt":78.006,"start":1238,"end":1363},{"cath_id":"1.10.533.10","chopping":"1403-1480","consensus_level":"medium","plddt":83.2338,"start":1403,"end":1480}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P16157","model_url":"https://alphafold.ebi.ac.uk/files/AF-P16157-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P16157-F1-predicted_aligned_error_v6.png","plddt_mean":69.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ANK1","jax_strain_url":"https://www.jax.org/strain/search?query=ANK1"},"sequence":{"accession":"P16157","fasta_url":"https://rest.uniprot.org/uniprotkb/P16157.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P16157/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P16157"}},"corpus_meta":[{"pmid":"25129075","id":"PMC_25129075","title":"Alzheimer's disease: early alterations in brain DNA methylation at ANK1, BIN1, RHBDF2 and other loci.","date":"2014","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/25129075","citation_count":736,"is_preprint":false},{"pmid":"10894769","id":"PMC_10894769","title":"Role of the mouse ank gene in control of tissue calcification and arthritis.","date":"2000","source":"Science (New York, N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/10894769","citation_count":515,"is_preprint":false},{"pmid":"25129077","id":"PMC_25129077","title":"Methylomic profiling implicates cortical deregulation of ANK1 in Alzheimer's disease.","date":"2014","source":"Nature neuroscience","url":"https://pubmed.ncbi.nlm.nih.gov/25129077","citation_count":439,"is_preprint":false},{"pmid":"15039209","id":"PMC_15039209","title":"Concerted regulation of inorganic pyrophosphate and osteopontin by akp2, enpp1, and ank: an integrated model of the pathogenesis of mineralization disorders.","date":"2004","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/15039209","citation_count":400,"is_preprint":false},{"pmid":"14731966","id":"PMC_14731966","title":"The ANK repeat: a ubiquitous motif involved in macromolecular recognition.","date":"1992","source":"Trends in cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/14731966","citation_count":172,"is_preprint":false},{"pmid":"12456646","id":"PMC_12456646","title":"Crystal structure of a 12 ANK repeat stack from human ankyrinR.","date":"2002","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/12456646","citation_count":166,"is_preprint":false},{"pmid":"10574708","id":"PMC_10574708","title":"Integrin-linked kinase is localized to cell-matrix focal adhesions but not cell-cell adhesion sites and the focal adhesion localization of integrin-linked kinase is regulated by the PINCH-binding ANK repeats.","date":"1999","source":"Journal of cell science","url":"https://pubmed.ncbi.nlm.nih.gov/10574708","citation_count":163,"is_preprint":false},{"pmid":"12817751","id":"PMC_12817751","title":"Linked deficiencies in extracellular PP(i) and osteopontin mediate pathologic calcification associated with defective PC-1 and ANK expression.","date":"2003","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/12817751","citation_count":158,"is_preprint":false},{"pmid":"11326338","id":"PMC_11326338","title":"Autosomal dominant craniometaphyseal dysplasia is caused by mutations in the transmembrane protein ANK.","date":"2001","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/11326338","citation_count":143,"is_preprint":false},{"pmid":"7665627","id":"PMC_7665627","title":"The ANK repeats of erythrocyte ankyrin form two distinct but cooperative binding sites for the erythrocyte anion exchanger.","date":"1995","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7665627","citation_count":103,"is_preprint":false},{"pmid":"17186460","id":"PMC_17186460","title":"Biochemical and genetic analysis of ANK in arthritis and bone disease.","date":"2006","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/17186460","citation_count":94,"is_preprint":false},{"pmid":"26830532","id":"PMC_26830532","title":"Mutational characteristics of ANK1 and SPTB genes in hereditary spherocytosis.","date":"2016","source":"Clinical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/26830532","citation_count":76,"is_preprint":false},{"pmid":"16920632","id":"PMC_16920632","title":"Control of axonal sprouting and dendrite branching by the Nrg-Ank complex at the neuron-glia interface.","date":"2006","source":"Current biology : CB","url":"https://pubmed.ncbi.nlm.nih.gov/16920632","citation_count":76,"is_preprint":false},{"pmid":"20053580","id":"PMC_20053580","title":"Anaplasma phagocytophilum and Ehrlichia chaffeensis type IV secretion and Ank proteins.","date":"2010","source":"Current opinion in microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/20053580","citation_count":72,"is_preprint":false},{"pmid":"6095872","id":"PMC_6095872","title":"Hereditary joint disorder in progressive ankylosis (ank/ank) mice. I. Association of calcium hydroxyapatite deposition with inflammatory arthropathy.","date":"1984","source":"Arthritis and rheumatism","url":"https://pubmed.ncbi.nlm.nih.gov/6095872","citation_count":70,"is_preprint":false},{"pmid":"12483726","id":"PMC_12483726","title":"Up-regulated expression of cartilage intermediate-layer protein and ANK in articular hyaline cartilage from patients with calcium pyrophosphate dihydrate crystal deposition disease.","date":"2002","source":"Arthritis and rheumatism","url":"https://pubmed.ncbi.nlm.nih.gov/12483726","citation_count":70,"is_preprint":false},{"pmid":"15601852","id":"PMC_15601852","title":"Role of the progressive ankylosis gene (ank) in cartilage mineralization.","date":"2005","source":"Molecular and cellular biology","url":"https://pubmed.ncbi.nlm.nih.gov/15601852","citation_count":68,"is_preprint":false},{"pmid":"22654665","id":"PMC_22654665","title":"Polydnavirus Ank proteins bind NF-κB homodimers and inhibit processing of Relish.","date":"2012","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/22654665","citation_count":68,"is_preprint":false},{"pmid":"9003776","id":"PMC_9003776","title":"Roles of the RAM and ANK domains in signaling by the C. elegans GLP-1 receptor.","date":"1996","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/9003776","citation_count":68,"is_preprint":false},{"pmid":"10747108","id":"PMC_10747108","title":"Comparison of the nucleotide sequences of 16S rRNA, 444 Ep-ank, and groESL heat shock operon genes in naturally occurring Ehrlichia equi and human granulocytic ehrlichiosis agent isolates from Northern California.","date":"2000","source":"Journal of clinical microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/10747108","citation_count":62,"is_preprint":false},{"pmid":"30439595","id":"PMC_30439595","title":"A cross-brain regions study of ANK1 DNA methylation in different neurodegenerative diseases.","date":"2018","source":"Neurobiology of aging","url":"https://pubmed.ncbi.nlm.nih.gov/30439595","citation_count":58,"is_preprint":false},{"pmid":"16869722","id":"PMC_16869722","title":"Mineral formation in joints caused by complete or joint-specific loss of ANK function.","date":"2006","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/16869722","citation_count":58,"is_preprint":false},{"pmid":"21124937","id":"PMC_21124937","title":"ANK, a host cytoplasmic receptor for the Tobacco mosaic virus cell-to-cell movement protein, facilitates intercellular transport through plasmodesmata.","date":"2010","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/21124937","citation_count":58,"is_preprint":false},{"pmid":"15023384","id":"PMC_15023384","title":"Upregulated ank expression in osteoarthritis can promote both chondrocyte MMP-13 expression and calcification via chondrocyte extracellular PPi excess.","date":"2004","source":"Osteoarthritis and cartilage","url":"https://pubmed.ncbi.nlm.nih.gov/15023384","citation_count":57,"is_preprint":false},{"pmid":"10921951","id":"PMC_10921951","title":"Sequence analysis of the ank gene of granulocytic ehrlichiae.","date":"2000","source":"Journal of clinical microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/10921951","citation_count":56,"is_preprint":false},{"pmid":"20200976","id":"PMC_20200976","title":"Progressive ankylosis protein (ANK) in osteoblasts and osteoclasts controls bone formation and bone remodeling.","date":"2010","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/20200976","citation_count":54,"is_preprint":false},{"pmid":"23457408","id":"PMC_23457408","title":"Type 2 diabetes risk alleles near BCAR1 and in ANK1 associate with decreased β-cell function whereas risk alleles near ANKRD55 and GRB14 associate with decreased insulin sensitivity in the Danish Inter99 cohort.","date":"2013","source":"The Journal of clinical endocrinology and metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/23457408","citation_count":51,"is_preprint":false},{"pmid":"29734393","id":"PMC_29734393","title":"Orientia tsutsugamushi uses two Ank effectors to modulate NF-κB p65 nuclear transport and inhibit NF-κB transcriptional activation.","date":"2018","source":"PLoS pathogens","url":"https://pubmed.ncbi.nlm.nih.gov/29734393","citation_count":49,"is_preprint":false},{"pmid":"20604715","id":"PMC_20604715","title":"Parallel regulation of extracellular ATP and inorganic pyrophosphate: roles of growth factors, transduction modulators, and ANK.","date":"2010","source":"Connective tissue research","url":"https://pubmed.ncbi.nlm.nih.gov/20604715","citation_count":46,"is_preprint":false},{"pmid":"7798219","id":"PMC_7798219","title":"The major kidney AE1 isoform does not bind ankyrin (Ank1) in vitro. An essential role for the 79 NH2-terminal amino acid residues of band 3.","date":"1994","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/7798219","citation_count":46,"is_preprint":false},{"pmid":"21149338","id":"PMC_21149338","title":"A Phe377del mutation in ANK leads to impaired osteoblastogenesis and osteoclastogenesis in a mouse model for craniometaphyseal dysplasia (CMD).","date":"2010","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21149338","citation_count":41,"is_preprint":false},{"pmid":"12499372","id":"PMC_12499372","title":"The alpha-helical D1 domain of the tobacco bZIP transcription factor BZI-1 interacts with the ankyrin-repeat protein ANK1 and is important for BZI-1 function, both in auxin signaling and pathogen response.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12499372","citation_count":39,"is_preprint":false},{"pmid":"18034874","id":"PMC_18034874","title":"Inorganic pyrophosphate generation by transforming growth factor-beta-1 is mainly dependent on ANK induction by Ras/Raf-1/extracellular signal-regulated kinase pathways in chondrocytes.","date":"2007","source":"Arthritis research & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/18034874","citation_count":38,"is_preprint":false},{"pmid":"31548610","id":"PMC_31548610","title":"Ankyrin repeat-containing N-Ank proteins shape cellular membranes.","date":"2019","source":"Nature cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/31548610","citation_count":37,"is_preprint":false},{"pmid":"19257826","id":"PMC_19257826","title":"Introduction of a Phe377del mutation in ANK creates a mouse model for craniometaphyseal dysplasia.","date":"2009","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/19257826","citation_count":37,"is_preprint":false},{"pmid":"12056852","id":"PMC_12056852","title":"Developmental and TGF-beta-mediated regulation of Ank mRNA expression in cartilage and bone.","date":"2002","source":"Osteoarthritis and cartilage","url":"https://pubmed.ncbi.nlm.nih.gov/12056852","citation_count":37,"is_preprint":false},{"pmid":"125221","id":"PMC_125221","title":"Human karyotype polymorphism. III. Routine ank fluorescence microscopic investigation of chromosomes in normal adults and mentally retarded children.","date":"1975","source":"Humangenetik","url":"https://pubmed.ncbi.nlm.nih.gov/125221","citation_count":36,"is_preprint":false},{"pmid":"1826765","id":"PMC_1826765","title":"Dinucleotide repeat polymorphism at the human ankyrin gene (ANK1).","date":"1991","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/1826765","citation_count":36,"is_preprint":false},{"pmid":"11178113","id":"PMC_11178113","title":"The ank gene story.","date":"2000","source":"Arthritis research","url":"https://pubmed.ncbi.nlm.nih.gov/11178113","citation_count":35,"is_preprint":false},{"pmid":"24286344","id":"PMC_24286344","title":"The progressive ankylosis gene product ANK regulates extracellular ATP levels in primary articular chondrocytes.","date":"2013","source":"Arthritis research & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/24286344","citation_count":35,"is_preprint":false},{"pmid":"28965852","id":"PMC_28965852","title":"ANK1 Methylation regulates expression of MicroRNA-486-5p and discriminates lung tumors by histology and smoking status.","date":"2017","source":"Cancer letters","url":"https://pubmed.ncbi.nlm.nih.gov/28965852","citation_count":34,"is_preprint":false},{"pmid":"28700589","id":"PMC_28700589","title":"ANK1 is up-regulated in laser captured microglia in Alzheimer's brain; the importance of addressing cellular heterogeneity.","date":"2017","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/28700589","citation_count":34,"is_preprint":false},{"pmid":"27032788","id":"PMC_27032788","title":"The Role of ANK in Calcium Pyrophosphate Deposition Disease.","date":"2016","source":"Current rheumatology reports","url":"https://pubmed.ncbi.nlm.nih.gov/27032788","citation_count":29,"is_preprint":false},{"pmid":"2541245","id":"PMC_2541245","title":"Progressive ankylosis (ank/ank) in mice: an animal model of spondyloarthropathy. II. Light and electron microscopic findings.","date":"1989","source":"The Journal of rheumatology","url":"https://pubmed.ncbi.nlm.nih.gov/2541245","citation_count":29,"is_preprint":false},{"pmid":"21674130","id":"PMC_21674130","title":"Effects of mechanical strain on ANK, ENPP1 and TGF-β1 expression in rat endplate chondrocytes in vitro.","date":"2011","source":"Molecular medicine reports","url":"https://pubmed.ncbi.nlm.nih.gov/21674130","citation_count":28,"is_preprint":false},{"pmid":"18174144","id":"PMC_18174144","title":"Bacterial sulfite dehydrogenases in organotrophic metabolism: separation and identification in Cupriavidus necator H16 and in Delftia acidovorans SPH-1.","date":"2008","source":"Microbiology (Reading, England)","url":"https://pubmed.ncbi.nlm.nih.gov/18174144","citation_count":28,"is_preprint":false},{"pmid":"20496369","id":"PMC_20496369","title":"Hypoxia-inducible factor regulation of ANK expression in nucleus pulposus cells: possible implications in controlling dystrophic mineralization in the intervertebral disc.","date":"2010","source":"Arthritis and rheumatism","url":"https://pubmed.ncbi.nlm.nih.gov/20496369","citation_count":27,"is_preprint":false},{"pmid":"9470011","id":"PMC_9470011","title":"High frequency of de novo mutations in ankyrin gene (ANK1) in children with hereditary spherocytosis.","date":"1998","source":"The Journal of pediatrics","url":"https://pubmed.ncbi.nlm.nih.gov/9470011","citation_count":27,"is_preprint":false},{"pmid":"29559251","id":"PMC_29559251","title":"A polydnavirus-encoded ANK protein has a negative impact on steroidogenesis and development.","date":"2018","source":"Insect biochemistry and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/29559251","citation_count":25,"is_preprint":false},{"pmid":"11796721","id":"PMC_11796721","title":"Identification of Ank(G107), a muscle-specific ankyrin-G isoform.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11796721","citation_count":25,"is_preprint":false},{"pmid":"18187567","id":"PMC_18187567","title":"Vanin-1 pantetheinase drives increased chondrogenic potential of mesenchymal precursors in ank/ank mice.","date":"2008","source":"The American journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/18187567","citation_count":25,"is_preprint":false},{"pmid":"19338977","id":"PMC_19338977","title":"Structure and mechanical properties of Ank/Ank mutant mouse dental tissues--an animal model for studying periodontal regeneration.","date":"2009","source":"Archives of oral biology","url":"https://pubmed.ncbi.nlm.nih.gov/19338977","citation_count":24,"is_preprint":false},{"pmid":"20133941","id":"PMC_20133941","title":"The inorganic pyrophosphate transporter ANK preserves the differentiated phenotype of articular chondrocyte.","date":"2010","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/20133941","citation_count":24,"is_preprint":false},{"pmid":"8703812","id":"PMC_8703812","title":"Ankyrin Napoli: a de novo deletional frameshift mutation in exon 16 of ankyrin gene (ANK1) associated with spherocytosis.","date":"1996","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/8703812","citation_count":24,"is_preprint":false},{"pmid":"12861042","id":"PMC_12861042","title":"Progressive ankylosis (Ank) protein is expressed by neurons and Ank immunohistochemical reactivity is increased by limbic seizures.","date":"2003","source":"Laboratory investigation; a journal of technical methods and pathology","url":"https://pubmed.ncbi.nlm.nih.gov/12861042","citation_count":24,"is_preprint":false},{"pmid":"21193012","id":"PMC_21193012","title":"A novel ENU-generated truncation mutation lacking the spectrin-binding and C-terminal regulatory domains of Ank1 models severe hemolytic hereditary spherocytosis.","date":"2010","source":"Experimental hematology","url":"https://pubmed.ncbi.nlm.nih.gov/21193012","citation_count":23,"is_preprint":false},{"pmid":"9054656","id":"PMC_9054656","title":"Frequent de novo mutations of the ANK1 gene mimic a recessive mode of transmission in hereditary spherocytosis: three new ANK1 variants: ankyrins Bari, Napoli II and Anzio.","date":"1997","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/9054656","citation_count":22,"is_preprint":false},{"pmid":"7912675","id":"PMC_7912675","title":"Rat interleukin-2-activated natural killer (A-NK) cell-mediated lysis is determined by the presence of CD18 on A-NK cells and the absence of major histocompatibility complex class I on target cells.","date":"1994","source":"European journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/7912675","citation_count":22,"is_preprint":false},{"pmid":"16546821","id":"PMC_16546821","title":"FGF2 alters expression of the pyrophosphate/phosphate regulating proteins, PC-1, ANK and TNAP, in the calvarial osteoblastic cell line, MC3T3E1(C4).","date":"2005","source":"Connective tissue research","url":"https://pubmed.ncbi.nlm.nih.gov/16546821","citation_count":21,"is_preprint":false},{"pmid":"33815817","id":"PMC_33815817","title":"The histone modification H3K4me3 is altered at the ANK1 locus in Alzheimer's disease brain.","date":"2021","source":"Future science OA","url":"https://pubmed.ncbi.nlm.nih.gov/33815817","citation_count":19,"is_preprint":false},{"pmid":"24889814","id":"PMC_24889814","title":"The novel pterostilbene derivative ANK-199 induces autophagic cell death through regulating PI3 kinase class III/beclin 1/Atg‑related proteins in cisplatin‑resistant CAR human oral cancer cells.","date":"2014","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/24889814","citation_count":19,"is_preprint":false},{"pmid":"19002483","id":"PMC_19002483","title":"Localization of ank1.5 in the sarcoplasmic reticulum precedes that of SERCA and RyR: relationship with the organization of obscurin in developing sarcomeres.","date":"2008","source":"Histochemistry and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/19002483","citation_count":19,"is_preprint":false},{"pmid":"24085277","id":"PMC_24085277","title":"Continuous cyclic mechanical tension increases ank expression in endplate chondrocytes through the TGF-β1 and p38 pathway.","date":"2013","source":"European journal of histochemistry : EJH","url":"https://pubmed.ncbi.nlm.nih.gov/24085277","citation_count":19,"is_preprint":false},{"pmid":"8639431","id":"PMC_8639431","title":"Generation of activated natural killer (A-NK) cells in patients with chronic myelogenous leukaemia and their role in the in vitro disappearance of BCR/abl-positive targets.","date":"1996","source":"British journal of haematology","url":"https://pubmed.ncbi.nlm.nih.gov/8639431","citation_count":18,"is_preprint":false},{"pmid":"24743267","id":"PMC_24743267","title":"A polydnavirus ANK protein acts as virulence factor by disrupting the function of prothoracic gland steroidogenic cells.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24743267","citation_count":18,"is_preprint":false},{"pmid":"39513269","id":"PMC_39513269","title":"ANK Deficiency-Mediated Cytosolic Citrate Accumulation Promotes Aortic Aneurysm.","date":"2024","source":"Circulation research","url":"https://pubmed.ncbi.nlm.nih.gov/39513269","citation_count":17,"is_preprint":false},{"pmid":"8471772","id":"PMC_8471772","title":"Distinct fetal Ank-1 and Ank-2 related proteins and mRNAs in normal and nb/nb mice.","date":"1993","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/8471772","citation_count":17,"is_preprint":false},{"pmid":"17762177","id":"PMC_17762177","title":"Expression and localisation of the pyrophosphate transporter, ANK, in murine kidney cells.","date":"2007","source":"Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry, and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/17762177","citation_count":16,"is_preprint":false},{"pmid":"24747173","id":"PMC_24747173","title":"The role of ANK interactions with MYBBP1a and SPHK1 in catabolic events of articular chondrocytes.","date":"2014","source":"Osteoarthritis and cartilage","url":"https://pubmed.ncbi.nlm.nih.gov/24747173","citation_count":16,"is_preprint":false},{"pmid":"17067391","id":"PMC_17067391","title":"P5L mutation in Ank results in an increase in extracellular inorganic pyrophosphate during proliferation and nonmineralizing hypertrophy in stably transduced ATDC5 cells.","date":"2006","source":"Arthritis research & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/17067391","citation_count":16,"is_preprint":false},{"pmid":"19220790","id":"PMC_19220790","title":"Nuclear accumulation of the ankyrin repeat protein ANK1 enhances the auxin-mediated transcription accomplished by the bZIP transcription factors BZI-1 and BZI-2.","date":"2009","source":"The Plant journal : for cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/19220790","citation_count":16,"is_preprint":false},{"pmid":"37468461","id":"PMC_37468461","title":"Loss of function mutation in Ank causes aberrant mineralization and acquisition of osteoblast-like-phenotype by the cells of the intervertebral disc.","date":"2023","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/37468461","citation_count":15,"is_preprint":false},{"pmid":"9652820","id":"PMC_9652820","title":"Infiltration patterns of short- and long-term cultured A-NK and T-LAK cells following adoptive immunotherapy.","date":"1998","source":"Scandinavian journal of immunology","url":"https://pubmed.ncbi.nlm.nih.gov/9652820","citation_count":15,"is_preprint":false},{"pmid":"10459491","id":"PMC_10459491","title":"Endogenous and adoptively transferred A-NK and T-LAK cells continuously accumulate within murine metastases up to 48 h after inoculation.","date":"1999","source":"In vivo (Athens, Greece)","url":"https://pubmed.ncbi.nlm.nih.gov/10459491","citation_count":15,"is_preprint":false},{"pmid":"18728347","id":"PMC_18728347","title":"Progressive ankylosis gene (ank) regulates osteoblast differentiation.","date":"2008","source":"Cells, tissues, organs","url":"https://pubmed.ncbi.nlm.nih.gov/18728347","citation_count":15,"is_preprint":false},{"pmid":"22771917","id":"PMC_22771917","title":"A de novo interstitial deletion of 8p11.2 including ANK1 identified in a patient with spherocytosis, psychomotor developmental delay, and distinctive facial features.","date":"2012","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/22771917","citation_count":15,"is_preprint":false},{"pmid":"29180989","id":"PMC_29180989","title":"ANK1 and DnaK-TPR, Two Tetratricopeptide Repeat-Containing Proteins Primarily Expressed in Toxoplasma Bradyzoites, Do Not Contribute to Bradyzoite Differentiation.","date":"2017","source":"Frontiers in microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/29180989","citation_count":15,"is_preprint":false},{"pmid":"35008990","id":"PMC_35008990","title":"A NAC Transcription Factor TuNAC69 Contributes to ANK-NLR-WRKY NLR-Mediated Stripe Rust Resistance in the Diploid Wheat Triticum urartu.","date":"2022","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/35008990","citation_count":14,"is_preprint":false},{"pmid":"19419319","id":"PMC_19419319","title":"Oxygen tension regulates the expression of ANK (progressive ankylosis) in an HIF-1-dependent manner in growth plate chondrocytes.","date":"2009","source":"Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research","url":"https://pubmed.ncbi.nlm.nih.gov/19419319","citation_count":14,"is_preprint":false},{"pmid":"14671619","id":"PMC_14671619","title":"Normoblastosis, a murine model for ankyrin-deficient hemolytic anemia, is caused by a hypomorphic mutation in the erythroid ankyrin gene Ank1.","date":"2003","source":"The hematology journal : the official journal of the European Haematology Association","url":"https://pubmed.ncbi.nlm.nih.gov/14671619","citation_count":14,"is_preprint":false},{"pmid":"20358596","id":"PMC_20358596","title":"Three novel mutations in the ANK membrane protein cause craniometaphyseal dysplasia with variable conductive hearing loss.","date":"2010","source":"American journal of medical genetics. Part A","url":"https://pubmed.ncbi.nlm.nih.gov/20358596","citation_count":14,"is_preprint":false},{"pmid":"26611832","id":"PMC_26611832","title":"Association of Single-Nucleotide Polymorphism in ANK1 with Late-Onset Alzheimer's Disease in Han Chinese.","date":"2015","source":"Molecular neurobiology","url":"https://pubmed.ncbi.nlm.nih.gov/26611832","citation_count":13,"is_preprint":false},{"pmid":"17273184","id":"PMC_17273184","title":"Targeting of products of genes to tumor sites using adoptively transferred A-NK and T-LAK cells.","date":"2007","source":"Cancer gene therapy","url":"https://pubmed.ncbi.nlm.nih.gov/17273184","citation_count":13,"is_preprint":false},{"pmid":"9162263","id":"PMC_9162263","title":"Expression and function of LFA-1 on A-NK and T-LAK cells: role in tumor target killing and migration into tumor tissue.","date":"1996","source":"Natural immunity","url":"https://pubmed.ncbi.nlm.nih.gov/9162263","citation_count":13,"is_preprint":false},{"pmid":"8980912","id":"PMC_8980912","title":"Immunocytochemical localization of multicatalytic protease complex (proteasome) during generation of murine IL-2-activated natural killer (A-NK) cells.","date":"1996","source":"European journal of cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/8980912","citation_count":13,"is_preprint":false},{"pmid":"31016877","id":"PMC_31016877","title":"Two novel ANK1 loss-of-function mutations in Chinese families with hereditary spherocytosis.","date":"2019","source":"Journal of cellular and molecular medicine","url":"https://pubmed.ncbi.nlm.nih.gov/31016877","citation_count":12,"is_preprint":false},{"pmid":"32859219","id":"PMC_32859219","title":"Comparative analysis of ankyrin (ANK) genes of five capripoxviruses isolate strains from Xinjiang province in China.","date":"2020","source":"Virology journal","url":"https://pubmed.ncbi.nlm.nih.gov/32859219","citation_count":12,"is_preprint":false},{"pmid":"22298904","id":"PMC_22298904","title":"Aberrant chondrocyte hypertrophy and activation of β-catenin signaling precede joint ankylosis in ank/ank mice.","date":"2012","source":"The Journal of rheumatology","url":"https://pubmed.ncbi.nlm.nih.gov/22298904","citation_count":12,"is_preprint":false},{"pmid":"28286238","id":"PMC_28286238","title":"The role of the progressive ankylosis protein (ANK) in adipogenic/osteogenic fate decision of precursor cells.","date":"2017","source":"Bone","url":"https://pubmed.ncbi.nlm.nih.gov/28286238","citation_count":12,"is_preprint":false},{"pmid":"20432454","id":"PMC_20432454","title":"Phosphate and calcium are required for TGFbeta-mediated stimulation of ANK expression and function during chondrogenesis.","date":"2010","source":"Journal of cellular physiology","url":"https://pubmed.ncbi.nlm.nih.gov/20432454","citation_count":12,"is_preprint":false},{"pmid":"9234582","id":"PMC_9234582","title":"Apparently normal ankyrin content in unsplenectomized hereditary spherocytosis patients with the inactivation of one ankyrin (ANK1) allele.","date":"1997","source":"Haematologica","url":"https://pubmed.ncbi.nlm.nih.gov/9234582","citation_count":12,"is_preprint":false},{"pmid":"28912869","id":"PMC_28912869","title":"Association of ANK1 variants with new-onset type 2 diabetes in a Han Chinese population from northeast China.","date":"2017","source":"Experimental and therapeutic medicine","url":"https://pubmed.ncbi.nlm.nih.gov/28912869","citation_count":11,"is_preprint":false},{"pmid":"26107955","id":"PMC_26107955","title":"Identification of a novel p.Q1772X ANK1 mutation in a Korean family with hereditary spherocytosis.","date":"2015","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/26107955","citation_count":11,"is_preprint":false},{"pmid":"11381172","id":"PMC_11381172","title":"Modulation of A-NK cell rigidity: In vitro characterization and in vivo implications for cell delivery.","date":"2001","source":"Biorheology","url":"https://pubmed.ncbi.nlm.nih.gov/11381172","citation_count":11,"is_preprint":false},{"pmid":"27466194","id":"PMC_27466194","title":"The progressive ankylosis protein ANK facilitates clathrin- and adaptor-mediated membrane traffic at the trans-Golgi network-to-endosome interface.","date":"2016","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/27466194","citation_count":10,"is_preprint":false},{"pmid":"10813297","id":"PMC_10813297","title":"HLA-B27 has no effect on the phenotypic expression of progressive ankylosis in ank/ank mice.","date":"2000","source":"The Journal of rheumatology","url":"https://pubmed.ncbi.nlm.nih.gov/10813297","citation_count":10,"is_preprint":false},{"pmid":"24065227","id":"PMC_24065227","title":"JNK phosphorylation promotes natural degeneration of cervical endplate chondrocytes by down-regulating expression of ANK.","date":"2013","source":"European review for medical and pharmacological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/24065227","citation_count":10,"is_preprint":false},{"pmid":"29057904","id":"PMC_29057904","title":"The ANK repeats of Notch-4/Int3 activate NF-κB canonical pathway in the absence of Rbpj and causes mammary tumorigenesis.","date":"2017","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/29057904","citation_count":10,"is_preprint":false},{"pmid":"29228571","id":"PMC_29228571","title":"Identification of a novel de novo ANK1 R1426* nonsense mutation in a Chinese family with hereditary spherocytosis by NGS.","date":"2017","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/29228571","citation_count":10,"is_preprint":false},{"pmid":"12832051","id":"PMC_12832051","title":"Targeting of the AE2 anion exchanger to the Golgi apparatus is cell type-dependent and correlates with the expression of Ank(195), a Golgi membrane skeletal protein.","date":"2003","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/12832051","citation_count":10,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":50560,"output_tokens":5866,"usd":0.119835},"stage2":{"model":"claude-opus-4-6","input_tokens":9558,"output_tokens":3891,"usd":0.217597},"total_usd":0.337432,"stage1_batch_id":"msgbatch_01TqNM6p6FsoMBT2jzQTwKBr","stage2_batch_id":"msgbatch_01Ya473eco8sTHbvRymQaU8o","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"The mouse Ank gene encodes a multipass transmembrane protein (ANK) that controls extracellular pyrophosphate levels in cultured cells, acting as a pyrophosphate transport/channel protein that regulates tissue calcification and arthritis.\",\n      \"method\": \"Positional cloning of the progressive ankylosis locus; functional assay of pyrophosphate levels in cultured cells from ank/ank mutant mice\",\n      \"journal\": \"Science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — original gene identification with functional cellular assay, foundational paper with >500 citations replicated extensively\",\n      \"pmids\": [\"10894769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Dominant mutations in the ANK transmembrane protein cause craniometaphyseal dysplasia; the mutations cluster in a cytosolic domain and are proposed to act as dominant negatives on pyrophosphate transport function.\",\n      \"method\": \"Mutational analysis of positional candidate genes in CMD families; identification of in-frame deletions and insertion mutations\",\n      \"journal\": \"American Journal of Human Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — genetic linkage plus mutational analysis in multiple families, >100 citations\",\n      \"pmids\": [\"11326338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"Crystal structure of ANK repeats 13–24 of human ankyrin-R reveals a contiguous spiral stack; the spectrin-binding domain associates as an extended strand; models indicate ion transporters such as the anion exchanger bind in a large central cavity while clathrin and cell adhesion molecules bind outside the cavity.\",\n      \"method\": \"X-ray crystallography of ANK repeat 13–24 construct; structural modeling of binding interactions\",\n      \"journal\": \"The EMBO Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional modeling, >160 citations\",\n      \"pmids\": [\"12456646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The 24 ANK repeats of erythrocyte ankyrin (ANK1) membrane-binding domain form four subdomains; two distinct but cooperatively coupled binding sites for the anion exchanger (Cl⁻/HCO₃⁻ exchanger) are present — one using repeats 7–12 and the other requiring repeats 13–24.\",\n      \"method\": \"In vitro binding assays using recombinant ANK repeat subdomains; Hill coefficient analysis of cooperativity\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution binding assay with domain mapping, >100 citations\",\n      \"pmids\": [\"7665627\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"The NH₂-terminal 79 amino acids of erythroid AE1 (band 3) are essential for high-affinity binding to ANK1; the kidney AE1 isoform (kAE1), which lacks these 79 residues, does not bind ANK1 in vitro.\",\n      \"method\": \"Cell-free binding assay with ¹²⁵I-labeled ANK1 fragment R13-H; transfection of full-length and truncated AE1 constructs; Kd determination\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — quantitative in vitro binding assay with mutagenesis/truncation controls\",\n      \"pmids\": [\"7798219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Wild-type ANK mediates saturable transport of pyrophosphate ions across the plasma membrane (half-maximal at physiological PPi levels) in Xenopus oocytes; craniometaphyseal dysplasia mutations abolish transport activity and cannot rescue Ank null mice, while chondrocalcinosis mutations retain transport activity and rescue the joint-fusion phenotype.\",\n      \"method\": \"Radiolabeled pyrophosphate transport assay in Xenopus oocytes; transgenic mouse rescue experiments with bacterial artificial chromosome constructs carrying human mutations; micro-CT\",\n      \"journal\": \"American Journal of Human Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted transport assay in oocytes plus orthogonal in vivo rescue genetics\",\n      \"pmids\": [\"17186460\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"ANK and NPP1 (PC-1) coordinately regulate extracellular PPi and osteopontin levels; ANK-deficient (ank/ank) and NPP1-deficient mice have decreased extracellular PPi and are hypermineralized; double-mutant (Akp2⁻/⁻; ank/ank) mice show partial normalization of PPi and OPN, demonstrating genetic epistasis among TNAP, NPP1, and ANK in mineralization control.\",\n      \"method\": \"Genetic epistasis via crossbreeding Akp2⁻/⁻, ank/ank, and Enpp1⁻/⁻ mice; PPi measurement; OPN mRNA and serum assays; osteoblast culture with exogenous PPi\",\n      \"journal\": \"American Journal of Pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multi-allele genetic epistasis with biochemical validation, >400 citations\",\n      \"pmids\": [\"15039209\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"ANK transports intracellular PPi to the extracellular milieu in growth plate chondrocytes; increased ANK activity elevates extracellular PPi, which is hydrolyzed to Pi by alkaline phosphatase, triggering Pi-mediated upregulation of alkaline phosphatase expression and subsequent mineralization; blocking ANK transport increases intra- and extracellular PPi and inhibits mineralization.\",\n      \"method\": \"Ank siRNA knockdown and overexpression in growth plate chondrocytes; PPi concentration measurements; alkaline phosphatase activity assays; phosphate transport inhibitor (PFA) studies; gene expression analysis\",\n      \"journal\": \"Molecular and Cellular Biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — loss- and gain-of-function with multiple biochemical readouts in the same study\",\n      \"pmids\": [\"15601852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ANK deficiency (ank/ank) and PC-1 deficiency both cause decreased extracellular PPi and osteopontin expression in osteoblasts, leading to hypercalcification; soluble PC-1 corrected both extracellular PPi and OPN deficiencies; ANK requires PC-1 to elevate extracellular PPi, indicating functional interdependence.\",\n      \"method\": \"Culture of PC-1⁻/⁻ and ank/ank calvarial osteoblasts; NPP activity assay; transfection rescue with PC-1 or NPP3; OPN measurement; calcification assays\",\n      \"journal\": \"Journal of Bone and Mineral Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — cell culture loss-of-function with transfection rescue and multiple biochemical readouts\",\n      \"pmids\": [\"12817751\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TGF-β1 increases ANK expression via Ras/Raf-1/ERK and Ca²⁺-dependent PKC pathways (but not p38-MAPK, PKA, or Smad7 pathway), and ANK contributes ~60% of TGF-β1-induced extracellular PPi generation in chondrocytes.\",\n      \"method\": \"siRNA knockdown of ANK and PC-1; selective kinase inhibitors; dominant-negative/overexpression plasmid strategy; quantitative PCR and Western blot; PPi quantification\",\n      \"journal\": \"Arthritis Research & Therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — pharmacological and genetic dissection of signaling pathway with quantitative PPi readout, single lab\",\n      \"pmids\": [\"18034874\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ANK localizes to the trans-Golgi network, clathrin-coated vesicles, and plasma membrane; ANK functionally interacts with clathrin and AP complexes; loss of ANK reduces tubular membrane carrier formation from the TGN, causes perinuclear accumulation of early endosomes, and impairs transferrin endocytosis.\",\n      \"method\": \"Immunofluorescence localization; co-immunoprecipitation with clathrin/AP complexes; RNAi knockdown with quantitative membrane trafficking assays (transferrin endocytosis, tubule formation)\",\n      \"journal\": \"Human Molecular Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP plus functional trafficking assay, single lab\",\n      \"pmids\": [\"27466194\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ANK is required locally in joints to inhibit postnatal mineral formation; joint-specific deletion of ANK (using Gdf5-Cre) produces joint mineralization and ankylosis, demonstrating that ANK function is cell-autonomous within joint tissue.\",\n      \"method\": \"Conditional knockout via Gdf5-Cre/loxP; null allele generation by homologous recombination; joint range-of-motion assays; micro-CT; histology\",\n      \"journal\": \"Journal of Bone and Mineral Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with tissue-specific phenotype, orthogonal morphological and imaging readouts\",\n      \"pmids\": [\"16869722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ANK deficiency suppresses osteoblastic differentiation and osteoclastogenesis in ank/ank bone marrow cells; ANK overexpression increases Runx2 transcriptional activity and osterix expression; exogenous extracellular PPi or Pi partially rescues delayed osteoblastogenesis.\",\n      \"method\": \"Bone marrow stromal cell culture from ank/ank mice; siRNA and overexpression in MC3T3-E1; alkaline phosphatase activity; gene expression; luciferase reporter for Runx2 transcriptional activity; osteoclast differentiation assays\",\n      \"journal\": \"Journal of Bone and Mineral Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — loss- and gain-of-function with mechanistic PPi/Pi rescue, single lab\",\n      \"pmids\": [\"20200976\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ANK overexpression in chondrocytes increases extracellular ATP levels 10-fold; ANK siRNA suppresses both basal and hypotonic-stress-induced ATP efflux; this effect is mimicked by the ANK inhibitor probenecid, implicating ANK as a transporter of extracellular ATP as well as PPi.\",\n      \"method\": \"Adenoviral overexpression and siRNA knockdown of ANK in chondrocytes; bioluminescent ATP assay; pharmacological inhibitors of ATP egress pathways; hypotonic stress model\",\n      \"journal\": \"Connective Tissue Research / Arthritis Research & Therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — gain- and loss-of-function with quantitative transport assay, replicated in two related papers (PMID 20604715, 24286344)\",\n      \"pmids\": [\"20604715\", \"24286344\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ANK maintains the differentiated chondrocyte phenotype by controlling canonical Wnt signaling in a Wnt-5a-dependent manner; ANK knockdown activates Wnt-5a and β-catenin nuclear translocation; PPi supplementation compensates for ANK deficiency on Type II collagen, Sox-9, and Wnt-5a expression.\",\n      \"method\": \"siRNA knockdown of ANK; Tcf/Lef reporter assay; β-catenin nuclear translocation by immunoblot; type II collagen and Sox-9 mRNA; conditioned medium transfer experiments\",\n      \"journal\": \"Journal of Biological Chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — siRNA with pathway reporter and rescue by PPi, single lab\",\n      \"pmids\": [\"20133941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ANK interacts with MYBBP1a via its C-terminal cytoplasmic loop and with SPHK1 via its N-terminal region; these interactions modulate NF-κB activity and catabolic events in IL-1β-treated chondrocytes — loss of ANK/MYBBP1a interaction increases nuclear MYBBP1a, decreases NF-κB activity, and reduces MMP-13 expression.\",\n      \"method\": \"Yeast two-hybrid screening; co-immunoprecipitation; domain-specific ANK mutants; NF-κB luciferase reporter; immunohistochemistry; femoral head explant proteoglycan loss assay\",\n      \"journal\": \"Osteoarthritis and Cartilage\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — yeast two-hybrid confirmed by co-IP, domain mutants, functional NF-κB readout, single lab\",\n      \"pmids\": [\"24747173\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ANK localizes to the lateral and apical plasma membranes of renal collecting duct epithelial cells; a loss-of-function mutation (Glu440X) causes Golgi retention of ANK-GFP rather than normal plasma membrane trafficking, indicating that proper trafficking is required for transport function.\",\n      \"method\": \"Immunohistochemistry and GFP fusion protein transfection in mIMCD3 cells; co-localization with organelle markers; comparison of wild-type vs. mutant ANK-GFP subcellular distribution\",\n      \"journal\": \"Cellular Physiology and Biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — localization with functional mutation comparison, single lab\",\n      \"pmids\": [\"17762177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ANK acts as a citrate membrane transporter in vascular smooth muscle cells (VSMCs); ANK deficiency causes cytosolic citrate accumulation, increased acetyl-CoA production, histone acetylation at H3K23/H3K27/H4K5, and transcriptional activation of inflammatory genes, promoting aortic aneurysm formation.\",\n      \"method\": \"VSMC-specific Ank knockout mice in Ang II- and CaPO4-induced AA models; untargeted metabolomics; CUT&Tag analysis of histone acetylation; ANK overexpression; acetyl-CoA inhibitor rescue experiments\",\n      \"journal\": \"Circulation Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — metabolomics + epigenomic analysis + KO/OE in vivo with mechanistic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"39513269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"HIF-1α and HIF-2α are negative regulators of ANK expression in nucleus pulposus cells; HIF binds to hypoxia-responsive elements (HREs) in the ANK promoter; silencing HIF-1α or HIF-2α increases ANK expression; HIF-1 requires only one HRE whereas HIF-2 requires both HREs to suppress ANK promoter activity.\",\n      \"method\": \"siRNA knockdown of HIF-1α/2α; luciferase reporter assays with wild-type and HRE-mutagenized ANK promoter; HIF-1β-null embryonic fibroblasts; ChIP not explicitly stated but promoter occupancy inferred from reporter mutagenesis\",\n      \"journal\": \"Arthritis and Rheumatism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — promoter reporter with site mutagenesis plus HIF null cells, single lab\",\n      \"pmids\": [\"20496369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"HIF-1α binds to HRE-1 (but not HRE-2) of the ANK proximal promoter in normoxia more avidly than in hypoxia, suppressing ANK expression; ANK expression and extracellular PPi levels are repressed in hypoxic conditions in growth plate chondrocytes in a HIF-1-dependent manner.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP) for HIF-1α at ANK HREs; HIF-1α knockdown; luciferase reporter assays with mutagenized HREs; oxygen tension manipulation\",\n      \"journal\": \"Journal of Bone and Mineral Research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — ChIP plus reporter assay with site-directed mutagenesis, single lab\",\n      \"pmids\": [\"19419319\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"ANK protein is expressed in neurons (predominantly in thalamus, cortical layers III and V, Purkinje cells, anterior horn neurons) and on both cell bodies and dendrites in primary neuronal cultures; ANK immunoreactivity increases in rat amygdala, hippocampus CA2/CA3, and cerebral cortex after seizure induction.\",\n      \"method\": \"Immunohistochemistry of human and rat brain; primary mouse neuronal cell culture immunostaining; kainate-induced seizure model with immunohistochemistry\",\n      \"journal\": \"Laboratory Investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 — direct localization by immunostaining in tissue and culture, functional context (seizure upregulation) noted but mechanism not fully defined\",\n      \"pmids\": [\"12861042\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ANK1 methylation at its promoter CpG island is associated with co-regulation of the intragenic microRNA miR-486-5p; siRNA-mediated ANK1 knockdown reduces miR-486-5p expression, and DNA methylation inhibitor 5-aza-2'-deoxycytidine induces both ANK1 and miR-486-5p, demonstrating that ANK1 methylation regulates miR-486-5p expression in lung cancer.\",\n      \"method\": \"siRNA knockdown; 5-aza-2'-deoxycytidine treatment; quantitative methylation analysis; expression correlation in TCGA dataset\",\n      \"journal\": \"Cancer Letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — siRNA and demethylation rescue establish co-regulation, single lab with TCGA validation\",\n      \"pmids\": [\"28965852\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ANK Phe377del mutation (CMD model) causes cell-autonomous impairment of osteoblast mineralization and osteoclastogenesis; Ank(KI/KI) osteoclasts show disrupted actin ring formation and impaired cell fusion; increased bone mass is partially rescued by bone marrow transplant, supporting reduced osteoclastogenesis as a contributor to hyperostosis.\",\n      \"method\": \"Knockin mouse model; osteoblast and macrophage cultures; ENPP1 activity assay; gene expression; bone marrow transplantation rescue\",\n      \"journal\": \"Human Molecular Genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — knockin model with cell-autonomous assays and transplantation rescue, single lab\",\n      \"pmids\": [\"21149338\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Loss-of-function ANK1 mutations prevent the protein from localizing to the plasma membrane and disrupt its interactions with SPTB (β-spectrin) and SLC4A1 (band 3/AE1), causing hereditary spherocytosis.\",\n      \"method\": \"In vitro expression of wild-type and mutant ANK1 constructs; co-immunoprecipitation with SPTB and SLC4A1; subcellular localization by immunofluorescence; osmotic fragility assay\",\n      \"journal\": \"Journal of Cellular and Molecular Medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 — co-IP and localization assays for multiple mutations, single lab\",\n      \"pmids\": [\"31016877\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ANK1 (ankyrin-1/erythroid ankyrin) is a multifunctional protein with two major mechanistic contexts: (1) as an erythroid scaffold protein, its 24-ANK-repeat membrane-binding domain forms a spiral stack that provides two cooperative binding sites for the anion exchanger (AE1/band 3) and links membrane proteins to the spectrin-actin cytoskeleton, with loss-of-function causing hereditary spherocytosis; and (2) the ANKH/progressive ankylosis paralog (sharing the ANK1 gene symbol in the pyrophosphate-transport literature) functions as a multipass transmembrane transporter that exports intracellular inorganic pyrophosphate (and ATP) to the extracellular space, thereby suppressing pathological tissue mineralization, maintaining the chondrocyte differentiated phenotype via PPi-dependent Wnt-5a/β-catenin signaling, regulating osteoblast and osteoclast differentiation, and in vascular smooth muscle cells transporting citrate to prevent cytosolic accumulation and downstream histone-acetylation-driven inflammatory gene activation.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ANK1 encompasses two distinct gene products with non-overlapping functions: erythroid ankyrin-1, a scaffold protein whose 24-ANK-repeat membrane-binding domain provides two cooperatively coupled binding sites (repeats 7–12 and 13–24) for the anion exchanger AE1/band 3 and links membrane proteins to the spectrin-actin cytoskeleton [PMID:7665627, PMID:7798219, PMID:12456646]; and the ANKH/progressive ankylosis protein, a multipass transmembrane transporter that exports inorganic pyrophosphate and ATP across the plasma membrane to regulate extracellular PPi levels, tissue mineralization, and skeletal homeostasis [PMID:10894769, PMID:17186460, PMID:20604715]. Loss-of-function mutations in erythroid ankyrin-1 disrupt binding to β-spectrin and AE1 and prevent plasma membrane localization, causing hereditary spherocytosis, while dominant ANKH mutations abolish PPi transport and cause craniometaphyseal dysplasia [PMID:31016877, PMID:11326338]. Beyond skeletal tissues, ANKH functions as a citrate transporter in vascular smooth muscle cells, where its loss causes cytosolic citrate accumulation, acetyl-CoA–driven histone hyperacetylation (H3K23/H3K27/H4K5), and inflammatory gene activation promoting aortic aneurysm [PMID:39513269].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Mapping the minimal AE1 determinants for ankyrin-1 binding established that the N-terminal 79 residues of erythroid AE1 are required for high-affinity interaction, explaining why the kidney AE1 isoform is ankyrin-independent.\",\n      \"evidence\": \"Cell-free binding assay with radiolabeled ANK1 fragment and full-length vs. truncated AE1 constructs\",\n      \"pmids\": [\"7798219\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the AE1–ankyrin interface at atomic resolution was not resolved\", \"Whether post-translational modifications regulate binding affinity was not tested\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Demonstrating two cooperatively coupled AE1-binding sites within the 24-ANK-repeat domain (repeats 7–12 and 13–24) established the modular, multivalent architecture of ankyrin-1's membrane-binding domain.\",\n      \"evidence\": \"In vitro binding assays with recombinant ANK repeat subdomains; Hill coefficient analysis\",\n      \"pmids\": [\"7665627\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How cooperativity is mechanistically transmitted between the two sites was unknown\", \"Whether additional membrane proteins engage other repeat subdomains was not addressed\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Positional cloning of the progressive ankylosis locus identified ANK as a multipass transmembrane protein controlling extracellular pyrophosphate levels, establishing a new gene product (distinct from erythroid ankyrin-1) as a PPi transporter and mineralization regulator.\",\n      \"evidence\": \"Positional cloning; PPi measurement in cultured cells from ank/ank mutant mice\",\n      \"pmids\": [\"10894769\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ANK transports PPi directly or facilitates its release indirectly was not resolved\", \"Topology and oligomeric state of the transporter were unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Identification of dominant ANK mutations in craniometaphyseal dysplasia families linked ANKH loss-of-function to a human skeletal disease, complementing the mouse ank/ank phenotype.\",\n      \"evidence\": \"Mutational analysis in CMD families; identification of in-frame deletions and insertions in a cytosolic domain\",\n      \"pmids\": [\"11326338\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biochemical proof that CMD mutations abrogate transport was not yet available\", \"Genotype-phenotype spectrum (CMD vs. chondrocalcinosis) was not explained mechanistically\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"The crystal structure of ANK repeats 13–24 revealed a contiguous spiral stack with a large central cavity, providing the first structural framework for understanding how ankyrin-1 engages ion transporters and other membrane proteins.\",\n      \"evidence\": \"X-ray crystallography of ANK repeat 13–24 construct\",\n      \"pmids\": [\"12456646\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length ankyrin-1 structure was not obtained\", \"Co-crystal with AE1 was not reported\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Functional interdependence between ANK and NPP1/PC-1 was established: ANK requires PC-1 enzymatic activity to elevate extracellular PPi, and both contribute to osteopontin expression and mineralization control in osteoblasts.\",\n      \"evidence\": \"Culture of PC-1−/− and ank/ank calvarial osteoblasts; transfection rescue with PC-1; PPi and OPN measurement\",\n      \"pmids\": [\"12817751\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether ANK and PC-1 physically interact was not tested\", \"Relative contributions of ANK vs. PC-1 to PPi levels in non-osteoblast tissues were unknown\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Triple genetic epistasis among TNAP, NPP1, and ANK demonstrated that these three genes form a coordinated regulatory circuit controlling extracellular PPi and mineralization in vivo.\",\n      \"evidence\": \"Crossbreeding Akp2−/−, ank/ank, and Enpp1−/− mice; PPi measurement; OPN assays\",\n      \"pmids\": [\"15039209\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative modeling of PPi flux through each pathway was lacking\", \"Whether additional PPi transporters compensate was not addressed\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"In growth plate chondrocytes, ANK-exported PPi is hydrolyzed by alkaline phosphatase to Pi, which feeds back to upregulate ALP expression, establishing ANK as a rate-limiting step in a mineralization-promoting loop.\",\n      \"evidence\": \"ANK siRNA and overexpression in chondrocytes; PPi/Pi measurements; ALP activity assays\",\n      \"pmids\": [\"15601852\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this PPi→Pi→ALP loop operates in non-cartilage tissues was untested\", \"Kinetic parameters of ANK transport in chondrocytes were not determined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Reconstitution of saturable PPi transport in Xenopus oocytes proved ANK is a bona fide transporter rather than an indirect regulator, and disease-specific mutations (CMD vs. chondrocalcinosis) were functionally segregated by their transport capacity.\",\n      \"evidence\": \"Radiolabeled PPi transport in Xenopus oocytes; BAC transgenic mouse rescue of ank/ank\",\n      \"pmids\": [\"17186460\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ion coupling mechanism (symport/antiport) was not determined\", \"Transporter structure remained unknown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Discovery that HIF-1α binds ANK promoter HRE-1 and represses ANK expression in hypoxia connected oxygen sensing to PPi metabolism in cartilage.\",\n      \"evidence\": \"ChIP for HIF-1α at ANK HREs; luciferase reporter assays with HRE mutagenesis; oxygen tension manipulation in chondrocytes\",\n      \"pmids\": [\"19419319\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of HIF-mediated ANK repression was not confirmed with conditional HIF knockout in cartilage\", \"Whether HIF regulation of ANK occurs outside cartilage was unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Multiple studies in 2010 expanded ANK's biological roles: joint-specific conditional knockout proved cell-autonomous anti-mineralization function; ANK was shown to transport extracellular ATP in addition to PPi; ANK maintained chondrocyte differentiation through PPi-dependent suppression of Wnt-5a/β-catenin signaling; and the CMD knockin model revealed cell-autonomous osteoclast defects including impaired actin ring formation.\",\n      \"evidence\": \"Gdf5-Cre conditional KO (PMID:16869722); bioluminescent ATP assay with ANK overexpression/knockdown (PMID:20604715); siRNA with Tcf/Lef reporter and PPi rescue (PMID:20133941); Ank KI/KI osteoclast culture and bone marrow transplant (PMID:21149338); ANK localization in renal cells (PMID:17762177)\",\n      \"pmids\": [\"16869722\", \"20604715\", \"20133941\", \"21149338\", \"17762177\", \"20200976\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Selectivity of ANK for PPi vs. ATP vs. other anions was not determined with purified protein\", \"Whether Wnt-5a regulation is direct or secondary to PPi-mediated signaling was unclear\", \"Structural basis for multi-substrate transport was unknown\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"ANK was found at the trans-Golgi network, clathrin-coated vesicles, and plasma membrane, and its loss impaired tubular carrier formation and transferrin endocytosis, revealing an unexpected role in intracellular membrane trafficking.\",\n      \"evidence\": \"Immunofluorescence; co-immunoprecipitation with clathrin/AP complexes; RNAi with transferrin endocytosis assays\",\n      \"pmids\": [\"27466194\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Relationship between trafficking function and PPi transport was not established\", \"Whether trafficking defects contribute to disease phenotypes was untested\", \"Single-lab finding not yet independently replicated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identification of MYBBP1a and SPHK1 as ANK-interacting proteins linked ANK to NF-κB-dependent catabolic signaling in chondrocytes, showing that ANK scaffolds signaling complexes beyond its transporter role.\",\n      \"evidence\": \"Yeast two-hybrid confirmed by co-IP; domain-specific ANK mutants; NF-κB luciferase reporter; explant proteoglycan loss assay\",\n      \"pmids\": [\"24747173\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether MYBBP1a interaction is relevant in vivo was not tested\", \"Stoichiometry and regulation of the ANK–MYBBP1a complex were not determined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Loss-of-function ANK1 mutations were shown to disrupt plasma membrane localization and interactions with β-spectrin and AE1, directly linking erythroid ankyrin-1 dysfunction to hereditary spherocytosis pathogenesis.\",\n      \"evidence\": \"Co-immunoprecipitation with SPTB and SLC4A1; subcellular localization of WT and mutant ANK1; osmotic fragility assay\",\n      \"pmids\": [\"31016877\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural consequences of specific mutations on the ANK repeat architecture were not resolved\", \"Whether any mutations retain partial function was not quantified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identification of ANK as a citrate transporter in VSMCs expanded its substrate repertoire and revealed an epigenetic mechanism — citrate accumulation → acetyl-CoA → histone hyperacetylation → inflammatory gene activation — linking ANK to aortic aneurysm.\",\n      \"evidence\": \"VSMC-specific Ank KO mice; untargeted metabolomics; CUT&Tag for histone acetylation; ANK overexpression and acetyl-CoA inhibitor rescue in aneurysm models\",\n      \"pmids\": [\"39513269\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether citrate transport is direct or mediated via PPi-dependent metabolic remodeling was not fully distinguished\", \"Relative importance of citrate vs. PPi transport in vascular biology is unclear\", \"ANK transporter structure still not determined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Critical open questions include: the atomic structure and transport mechanism of the ANKH multipass transmembrane protein; the substrate selectivity profile (PPi, ATP, citrate, and potentially other anions); whether the trafficking and scaffolding functions of ANKH are mechanistically linked to its transport activity; and the full-length structure of erythroid ankyrin-1 in complex with AE1 and spectrin.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of ANKH transporter exists\", \"Ion coupling mechanism and energetics of transport are undetermined\", \"Full-length ankyrin-1–AE1–spectrin ternary complex structure is lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [0, 5, 7, 13, 17]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [3, 4, 23]},\n      {\"term_id\": \"GO:0008092\", \"supporting_discovery_ids\": [2, 23]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [5, 10, 16, 23]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [10, 16]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [10]},\n      {\"term_id\": \"GO:0005856\", \"supporting_discovery_ids\": [2, 23]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-382551\", \"supporting_discovery_ids\": [0, 5, 7, 13, 17]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [6, 7, 8, 17]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [9, 14, 15]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [1, 22, 23]}\n    ],\n    \"complexes\": [\n      \"ankyrin-1/spectrin/AE1 membrane skeleton complex\"\n    ],\n    \"partners\": [\n      \"SLC4A1\",\n      \"SPTB\",\n      \"ENPP1\",\n      \"MYBBP1A\",\n      \"SPHK1\",\n      \"CLTC\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}