{"gene":"ATP2B1","run_date":"2026-04-28T17:12:37","timeline":{"discoveries":[{"year":2004,"finding":"Homozygous knockout of Atp2b1 (PMCA1) in mice causes embryolethality, establishing an essential housekeeping/developmental function for PMCA1, while heterozygous mice are overtly normal.","method":"Gene knockout (null mutation) in mice","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined lethal phenotype, replicated by multiple subsequent labs","pmids":["15178683"],"is_preprint":false},{"year":2006,"finding":"A Leu-Ile motif in the 'b'-tail splice variant of PMCA1 promotes basolateral sorting of PMCA1b in mammalian hair cells, while PMCA1 is expressed in the basolateral plasma membrane (not apical stereocilia) of inner ear hair cells.","method":"Subcellular localization by immunofluorescence/targeting assays, splice variant analysis in hair cells","journal":"Journal of cell science","confidence":"High","confidence_rationale":"Tier 2 — direct localization experiment with functional consequence (targeting motif identified), replicated across isoforms","pmids":["16803870"],"is_preprint":false},{"year":2007,"finding":"The 14-3-3ε protein physically interacts with PMCA1 (co-immunoprecipitation and GST pull-down), and this interaction inhibits PMCA1 Ca2+-pumping activity, impairing cellular Ca2+ re-establishment after InsP3-induced Ca2+ transients.","method":"Co-immunoprecipitation, GST pull-down, aequorin-based Ca2+ measurement in CHO cells co-expressing 14-3-3ε and PMCA1","journal":"Cell calcium","confidence":"High","confidence_rationale":"Tier 1–2 — reciprocal pull-down plus functional Ca2+ assay in same study","pmids":["18029012"],"is_preprint":false},{"year":2012,"finding":"Vascular smooth muscle cell-specific knockout of Atp2b1 in mice causes significantly elevated blood pressure, increased intracellular Ca2+ concentration in VSMCs at basal and phenylephrine-stimulated conditions, and increased phenylephrine-induced vasoconstriction, demonstrating that PMCA1 regulates blood pressure through Ca2+ handling in VSMCs.","method":"Cre-loxP conditional knockout in vascular smooth muscle cells, radiotelemetric blood pressure measurement, intracellular Ca2+ imaging, vascular ring contraction assays","journal":"Hypertension (Dallas, Tex. : 1979)","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with multiple orthogonal phenotypic readouts (BP, Ca2+, vasoconstriction)","pmids":["22311909"],"is_preprint":false},{"year":2013,"finding":"siRNA-mediated silencing of Atp2b1 in mice raises blood pressure, increases wall:lumen ratio of mesenteric arteries, and enhances myogenic and contractile responses to phenylephrine, confirming ATP2B1 controls blood pressure via vascular Ca2+ regulation.","method":"siRNA knockdown via tail-vein injection, blood pressure measurement, pressure myography, vascular contractility assays","journal":"Journal of hypertension","confidence":"High","confidence_rationale":"Tier 2 — in vivo siRNA KD with multiple vascular phenotype readouts","pmids":["23666421"],"is_preprint":false},{"year":2014,"finding":"Systemic heterozygous Atp2b1-null mice have elevated blood pressure associated with impaired eNOS phosphorylation (Ser-1177) and reduced nitric oxide production in endothelial cells, and increased phenylephrine-induced vasoconstriction that is normalized by NOS inhibition, establishing that PMCA1 regulates blood pressure partly through endothelial eNOS/NO signaling.","method":"Heterozygous knockout mice, radiotelemetric blood pressure, vascular ring assays with NOS inhibitor, eNOS phosphorylation by Western blot, NO measurement","journal":"Journal of hypertension","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods linking PMCA1 reduction to eNOS/NO pathway","pmids":["24805951"],"is_preprint":false},{"year":2015,"finding":"Intestine-specific deletion of Atp2b1 in mice (villin-Cre) reduces bone mineral density, impairs active intestinal calcium transport, and abolishes the normal upregulation of calcium absorption in response to 1α,25(OH)2D3, demonstrating that intestinal PMCA1 is required for vitamin D-dependent active Ca2+ absorption.","method":"Cre-loxP intestine-specific knockout, bone mineral density by DXA, active intestinal Ca2+ transport assay, 1,25(OH)2D3 administration","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with multiple physiological readouts (BMD, Ca2+ transport, vitamin D response)","pmids":["26392310"],"is_preprint":false},{"year":2017,"finding":"Vascular smooth muscle cell-specific Atp2b1 KO mice show upregulation of L-type calcium channels in VSMCs and greater antihypertensive response to calcium channel blockers (CCBs) compared to other drug classes, indicating that PMCA1 loss leads to compensatory L-type Ca2+ channel upregulation as a primary driver of elevated vascular Ca2+ and blood pressure.","method":"Conditional KO mice, blood pressure monitoring under antihypertensive drug treatment, L-type Ca2+ channel mRNA/protein expression by qPCR and Western blot","journal":"Hypertension research : official journal of the Japanese Society of Hypertension","confidence":"Medium","confidence_rationale":"Tier 2 — single lab conditional KO with pharmacological and molecular readouts","pmids":["29046519"],"is_preprint":false},{"year":2017,"finding":"Silencing ATP2B1 in HUVECs increases intracellular Ca2+, activates the Ca2+/calmodulin/eNOS signaling pathway, and enhances insulin-induced Akt (Ser473) phosphorylation; effects are abolished by Ca2+ chelation (BAPTA-AM), calmodulin antagonism (W7), or eNOS inhibition (L-NAME), demonstrating that PMCA1 regulates endothelial insulin sensitivity via Ca2+/calmodulin/eNOS/Akt.","method":"siRNA knockdown in HUVECs, intracellular Ca2+ imaging, Akt phosphorylation by Western blot, pharmacological inhibitors","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 — single lab, multiple orthogonal inhibitor and KD approaches confirming pathway","pmids":["29104511"],"is_preprint":false},{"year":2018,"finding":"ATP2B1 silencing in HUVECs increases intracellular Ca2+, enhances calmodulin-eNOS interaction, and increases NO production under basal conditions; effects are reversed by Ca2+ chelation or calmodulin antagonism, establishing that PMCA1 tonically suppresses eNOS activity via Ca2+/calmodulin signaling in endothelial cells.","method":"siRNA knockdown in HUVECs, NO measurement, eNOS activity assay, Ca2+ imaging, pharmacological inhibitors","journal":"Hypertension research : official journal of the Japanese Society of Hypertension","confidence":"Medium","confidence_rationale":"Tier 2 — single lab, multiple orthogonal methods confirming Ca2+/calmodulin/eNOS mechanism","pmids":["29416109"],"is_preprint":false},{"year":2018,"finding":"Systemic heterozygous Atp2b1-null mice develop hypocalcemia associated with reduced PTH secretion and hypercalciuria, and reduced ATP2B1 expression in kidney and small intestine, demonstrating that PMCA1 contributes to systemic calcium homeostasis beyond intracellular Ca2+ regulation.","method":"Heterozygous KO mice, serum Ca2+/PTH measurement, bone mineral density, urinary Ca2+ excretion, tissue qPCR/Western blot","journal":"Hypertension research : official journal of the Japanese Society of Hypertension","confidence":"Medium","confidence_rationale":"Tier 2 — single lab, multiple physiological readouts in vivo","pmids":["29950683"],"is_preprint":false},{"year":2020,"finding":"Conditional knockout of PMCA1 (Atp2b1) in B cells causes greatly reduced numbers of follicular B cells, marginal zone B cells, and B-1a cells, with elevated basal and ER Ca2+ and reduced Ca2+ clearance; PMCA4 is not expressed in B cells and its KO has no effect, establishing PMCA1 as the sole PMCA isoform required for B-cell Ca2+ homeostasis and normal B-cell development.","method":"Conditional KO mice (B cell-specific), flow cytometry, Western blot for PMCA isoform expression, intracellular Ca2+ measurement","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — conditional KO with multiple orthogonal readouts (cell numbers, Ca2+ handling, isoform expression), confirmed with PMCA4 KO comparison","pmids":["33098669"],"is_preprint":false},{"year":2022,"finding":"De novo missense variants in ATP2B1 in human patients cause neurodevelopmental delay; all nine tested missense variants introduced into HEK293 cells reduce Ca2+ export capacity compared to wild-type and show incorrect intracellular localization, demonstrating that loss of PMCA1 function (reduced Ca2+ export and mislocalization) is the pathomechanism for this neurodevelopmental disorder.","method":"Ca2+ imaging in transfected HEK293 cells, subcellular localization by confocal microscopy, 3D structural protein modeling, patient cohort","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 1–2 — functional Ca2+ assays and localization for all 9 variants, multiple orthogonal methods, replicated across 12 unrelated probands","pmids":["35358416"],"is_preprint":false},{"year":2022,"finding":"In stretched myoblasts, elevated calreticulin (CRT) suppresses PMCA1 activity via calmodulin inhibition (CRT-CaM-PMCA1 pathway), while reduced PMCA1 activity promotes CRT expression via p38MAPK activation (PMCA1-p38MAPK-CRT pathway), forming a positive feedback loop that amplifies intracellular Ca2+ accumulation and apoptosis; PMCA1 overexpression or CRT knockdown attenuates stretch-induced Ca2+ overload and apoptosis.","method":"Mechanical stretch in myoblasts, CRT/PMCA1 overexpression and knockdown, intracellular Ca2+ measurement, apoptosis assays, pharmacological inhibitors of CaM and p38MAPK","journal":"Apoptosis : an international journal on programmed cell death","confidence":"Medium","confidence_rationale":"Tier 2 — single lab, multiple gain/loss-of-function approaches and pharmacological dissection of pathway","pmids":["35976579"],"is_preprint":false},{"year":2023,"finding":"Compound heterozygous ATP2B1 variants (splice-site causing nonsense-mediated decay + missense p.Val980Leu) cause a biallelic loss-of-function phenotype with primary hypoparathyroidism and neurodevelopmental deficits; the missense variant in correctly-spliced mRNA causes decreased cellular Ca2+ extrusion as shown by functional Ca2+ assay, and reduced total ATP2B1 protein in patient fibroblasts.","method":"Trio exome sequencing, RT-PCR on fibroblast mRNA showing aberrant splicing and NMD, Ca2+ extrusion functional assay, immunoblotting","journal":"European journal of human genetics : EJHG","confidence":"Medium","confidence_rationale":"Tier 1–2 — functional Ca2+ assay plus RT-PCR splicing validation and protein quantification in patient cells","pmids":["37926713"],"is_preprint":false},{"year":2024,"finding":"SARS-CoV-2 infection activates PI3K/Akt signaling, inactivates FOXO3 transcription factor, and transcriptionally inhibits ATP2B1 (and ATP2A1) expression; pharmacological maintenance of ATP2B1 expression with a caloxin-derivative compound (PI-7) reduces intracellular Ca2+ and impairs SARS-CoV-2 replication, placing ATP2B1 downstream of PI3K/Akt/FOXO3 in viral replication-associated Ca2+ regulation.","method":"SARS-CoV-2 infection model, PI3K/Akt pathway inhibition, FOXO3 activity assays, intracellular Ca2+ measurement, viral replication assay, pharmacological compound PI-7","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 — single lab, multiple pathway and functional readouts linking SARS-CoV-2/PI3K/Akt/FOXO3 axis to ATP2B1 regulation","pmids":["38816514"],"is_preprint":false},{"year":2024,"finding":"Conditional knockout of ATP2B1 in CD4+ T cells causes colitis, elevated T-bet (Th1) and GATA3 (Th2) expression in blood CD4+ T cells, increased TNFα and gp91 (oxidative stress marker) in colon, and altered stool water/lipid content, demonstrating that PMCA1-mediated Ca2+ extrusion in CD4+ T cells is required to prevent T cell hyperactivation and colitis.","method":"CD4+ T cell-specific conditional KO (Cre-loxP), flow cytometry, qPCR, disease phenotype assessment (colon length, diarrhea, histology)","journal":"Inflammatory bowel diseases","confidence":"Medium","confidence_rationale":"Tier 2 — conditional KO with defined cellular and molecular phenotype, single lab","pmids":["38507609"],"is_preprint":false},{"year":2025,"finding":"ATP2B1 (PMCA1) was identified as a FZD4 proximity interactor in endothelial cells; ATP2B1 depletion increases endothelial Ca2+, attenuates Norrin/FZD4 β-catenin signaling through calcineurin/NFAT activation, and endothelial-specific Atp2b1 deletion causes retinal vascular defects consistent with impaired Norrin/FZD4 signaling; in developing brain, Atp2b1 endothelial KO exacerbates WNT7A/B pathway LOF phenotypes in Gpr124 KO mice.","method":"Proximity biotinylation (BioID), endothelial-specific conditional KO, retinal vascular phenotype analysis, Ca2+ measurement, calcineurin/NFAT pharmacological inhibition, genetic epistasis (Atp2b1/Gpr124 double KO)","journal":"bioRxiv : the preprint server for biology","confidence":"Medium","confidence_rationale":"Tier 1–2 — proximity biotinylation + conditional KO + genetic epistasis + pharmacological rescue in single study; preprint, not yet peer-reviewed","pmids":["40777252"],"is_preprint":true},{"year":2026,"finding":"A de novo missense variant p.Thr714Pro in ATP2B1 causes profound cytoplasmic mislocalization of PMCA1 (vs. plasma membrane localization of WT) and a 2.07-fold increase in basal intracellular Ca2+ in HEK293T cells, confirming impaired membrane trafficking and calcium dyshomeostasis as the core pathomechanism for MRD66.","method":"Whole-exome sequencing, confocal imaging of mScarlet-tagged WT and mutant ATP2B1 in HEK293T cells, Fluo-4 AM intracellular Ca2+ measurement","journal":"Experimental biology and medicine (Maywood, N.J.)","confidence":"Medium","confidence_rationale":"Tier 1–2 — direct localization imaging plus Ca2+ functional assay with mutant vs. WT comparison, single lab single variant","pmids":["41853798"],"is_preprint":false},{"year":2000,"finding":"The 1.7-kb promoter region of the human PMCA1 (ATP2B1) gene mediates transcriptional downregulation (transrepression) by 1,25-dihydroxyvitamin D3 in ROS 17/2.8 osteoblast cells but not MDBK cells, indicating tissue-specific vitamin D-dependent transcriptional regulation; EMSA showed that the candidate VDRE in this region does not bind VDR/RXRα, suggesting the positive regulatory VDRE lies outside this region.","method":"Luciferase reporter assays with PMCA1 promoter deletion constructs, EMSA with VDR/RXRα nuclear extracts","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1 — promoter reporter assays with multiple deletion constructs and EMSA, single lab","pmids":["11062020"],"is_preprint":false}],"current_model":"ATP2B1/PMCA1 is a plasma membrane Ca2+-ATPase that actively extrudes Ca2+ from cells to maintain intracellular Ca2+ homeostasis; it is essential for embryonic development (global KO is lethal), regulates blood pressure by controlling VSMC Ca2+ and vascular tone and by sustaining endothelial eNOS/NO production, mediates intestinal Ca2+ absorption required for bone mineralization, is required for B-cell and CD4+ T-cell Ca2+ homeostasis and normal immune development, facilitates Norrin/WNT7A/B-FZD4 β-catenin signaling in CNS endothelial cells, and is inhibited by 14-3-3ε interaction; pathogenic missense variants cause neurodevelopmental delay by reducing Ca2+ export capacity and/or causing protein mislocalization to the cytoplasm."},"narrative":{"teleology":[{"year":2000,"claim":"Before transcriptional regulation of ATP2B1 was understood, promoter-reporter studies showed that 1,25-dihydroxyvitamin D₃ transrepresses the PMCA1 promoter in a tissue-specific manner in osteoblasts, establishing that ATP2B1 expression is hormonally regulated at the transcriptional level.","evidence":"Luciferase reporter assays with promoter deletions and EMSA in ROS 17/2.8 osteoblasts vs. MDBK cells","pmids":["11062020"],"confidence":"Medium","gaps":["The positive VDRE element was not mapped","Mechanism of transrepression (indirect vs. direct VDR involvement) unresolved","Single cell line study"]},{"year":2004,"claim":"Demonstrating that PMCA1 is non-redundant with other PMCA isoforms, homozygous Atp2b1 knockout in mice was embryolethal, establishing an essential developmental role.","evidence":"Gene-targeted null mutation in mice","pmids":["15178683"],"confidence":"High","gaps":["Embryonic stage and cause of lethality not fully characterized","Whether lethality is due to Ca²⁺ overload, signaling defects, or structural failure was unknown"]},{"year":2006,"claim":"Addressing how PMCA1 is directed to specific membrane domains, a Leu-Ile motif in the 'b'-tail splice variant was shown to mediate basolateral sorting in hair cells, revealing isoform-specific polarized trafficking.","evidence":"Immunofluorescence localization and targeting assays in inner ear hair cells","pmids":["16803870"],"confidence":"High","gaps":["Whether the same motif governs sorting in other polarized epithelia was not tested","Adaptor proteins recognizing the Leu-Ile motif not identified"]},{"year":2007,"claim":"Identifying a regulatory partner, 14-3-3ε was shown to physically interact with PMCA1 and inhibit its Ca²⁺-pumping activity, establishing a protein–protein mechanism for PMCA1 functional modulation.","evidence":"Co-immunoprecipitation, GST pull-down, and aequorin-based Ca²⁺ assay in CHO cells","pmids":["18029012"],"confidence":"High","gaps":["Binding site on PMCA1 not mapped","Physiological context for 14-3-3ε inhibition in vivo not established","Whether phosphorylation-dependent"]},{"year":2012,"claim":"Conditional knockout and in vivo knockdown established that PMCA1 in vascular smooth muscle cells directly controls intracellular Ca²⁺ and blood pressure, mechanistically linking the GWAS-associated ATP2B1 locus to hypertension.","evidence":"VSMC-specific Cre-loxP KO with telemetric BP, Ca²⁺ imaging, and vascular ring assays; corroborated by systemic siRNA knockdown","pmids":["22311909","23666421"],"confidence":"High","gaps":["Relative contribution of VSMC vs. endothelial PMCA1 to total BP effect not dissected in these studies","Human genetic validation for VSMC-specific mechanism lacking"]},{"year":2014,"claim":"Heterozygous Atp2b1-null mice revealed an endothelial mechanism: reduced PMCA1 impairs eNOS Ser-1177 phosphorylation and NO production, showing PMCA1 regulates vascular tone through both smooth muscle Ca²⁺ handling and endothelial NO signaling.","evidence":"Heterozygous KO mice with telemetric BP, vascular ring assays ± NOS inhibitor, eNOS phosphorylation Western blot, NO measurement","pmids":["24805951"],"confidence":"High","gaps":["The paradox that PMCA1 loss raises Ca²⁺ yet impairs Ca²⁺/calmodulin-dependent eNOS was not fully reconciled at this stage"]},{"year":2015,"claim":"Intestine-specific Atp2b1 deletion demonstrated that PMCA1 is the rate-limiting basolateral Ca²⁺ pump for vitamin D–dependent active Ca²⁺ absorption, linking it to bone mineralization.","evidence":"Villin-Cre intestinal KO, DXA bone mineral density, intestinal Ca²⁺ transport assay ± 1,25(OH)₂D₃","pmids":["26392310"],"confidence":"High","gaps":["Relative contribution of PMCA1 vs. NCX1 at the basolateral membrane not quantified","Whether dietary Ca²⁺ rescue is possible not tested"]},{"year":2017,"claim":"Further mechanistic dissection showed that VSMC-specific PMCA1 loss upregulates L-type Ca²⁺ channels, explaining enhanced CCB sensitivity, and that in endothelial cells PMCA1 silencing activates a Ca²⁺/calmodulin/eNOS/Akt cascade affecting insulin signaling.","evidence":"Conditional KO mice with pharmacological antihypertensive testing; siRNA in HUVECs with Ca²⁺ imaging, Akt phosphorylation, and pathway inhibitors","pmids":["29046519","29104511"],"confidence":"Medium","gaps":["L-type channel upregulation mechanism (transcriptional vs. trafficking) not defined","In vivo validation of endothelial insulin sensitivity link absent"]},{"year":2018,"claim":"Basal tonic regulation of eNOS by PMCA1 was confirmed: PMCA1 silencing in endothelial cells increases calmodulin–eNOS interaction and NO production even without agonist stimulation, and heterozygous KO mice develop systemic hypocalcemia with reduced PTH and hypercalciuria.","evidence":"siRNA in HUVECs with NO/eNOS assays; heterozygous KO mice with serum Ca²⁺/PTH, urinary Ca²⁺","pmids":["29416109","29950683"],"confidence":"Medium","gaps":["Whether hypocalcemia is primary (renal/intestinal Ca²⁺ loss) or secondary (PTH deficiency) not resolved","Single-lab findings for both"]},{"year":2020,"claim":"B-cell-specific Atp2b1 KO revealed that PMCA1 is the sole PMCA isoform expressed in B cells and is required for normal B-cell development; its loss elevates basal and ER Ca²⁺ and depletes follicular, marginal zone, and B-1a cell populations.","evidence":"B-cell-specific conditional KO, flow cytometry, PMCA isoform Western blot, intracellular Ca²⁺ measurement","pmids":["33098669"],"confidence":"High","gaps":["Whether B-cell functional defects (antibody responses, class switching) accompany the numerical reduction not assessed","Downstream Ca²⁺-dependent transcriptional programs not identified"]},{"year":2022,"claim":"De novo ATP2B1 missense variants were established as the cause of a neurodevelopmental disorder (MRD66): all tested variants reduced Ca²⁺ export and showed cytoplasmic mislocalization, defining the human disease mechanism.","evidence":"Ca²⁺ imaging and confocal localization of 9 variants in HEK293 cells across 12 unrelated probands, structural modeling","pmids":["35358416"],"confidence":"High","gaps":["Neuronal-specific consequences of variants not studied","Genotype–phenotype correlations across variant severity not established","Animal model recapitulation of neurodevelopmental phenotype not reported"]},{"year":2023,"claim":"Biallelic ATP2B1 loss-of-function (compound heterozygous splice-site + missense) was shown to cause primary hypoparathyroidism alongside neurodevelopmental deficits, expanding the clinical spectrum of PMCA1 deficiency.","evidence":"Trio exome sequencing, RT-PCR showing NMD of splice variant, Ca²⁺ extrusion assay and immunoblotting in patient fibroblasts","pmids":["37926713"],"confidence":"Medium","gaps":["Single family — replication needed","Whether parathyroid Ca²⁺ sensing defect or PTH secretion defect not mechanistically distinguished"]},{"year":2024,"claim":"CD4⁺ T-cell-specific Atp2b1 KO caused spontaneous colitis with Th1/Th2 hyperactivation, establishing PMCA1 as a Ca²⁺-dependent brake on T-cell inflammatory signaling in the gut.","evidence":"CD4-Cre conditional KO mice, flow cytometry, colon histology, qPCR for T-bet/GATA3/TNFα","pmids":["38507609"],"confidence":"Medium","gaps":["Whether regulatory T-cell function is impaired not tested","Ca²⁺/NFAT pathway involvement in T-cell hyperactivation not directly measured"]},{"year":2024,"claim":"SARS-CoV-2 was shown to downregulate ATP2B1 via PI3K/Akt/FOXO3 axis, and pharmacological restoration of PMCA1 expression reduced viral replication, placing ATP2B1 in a host Ca²⁺ defense pathway exploited by the virus.","evidence":"SARS-CoV-2 infection model with PI3K/Akt inhibition, FOXO3 activity assays, Ca²⁺ measurement, viral replication assay","pmids":["38816514"],"confidence":"Medium","gaps":["Whether this extends to other viruses not tested","Direct FOXO3 binding to ATP2B1 promoter not shown by ChIP"]},{"year":null,"claim":"Key unresolved questions include the structural basis for pathogenic variant mislocalization, neuronal-specific consequences of PMCA1 loss, the mechanism by which PMCA1 supports Norrin/FZD4 β-catenin signaling in CNS endothelium, and whether PMCA1 pharmacological modulation has therapeutic potential for hypertension or neurodevelopmental disorders.","evidence":"","pmids":[],"confidence":"Low","gaps":["No high-resolution structure of human PMCA1 available","Neuron-specific conditional KO phenotype not reported","Norrin/FZD4 interaction mechanism from preprint awaits peer review","No therapeutic PMCA1 activator validated in vivo"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,2,3,11,12]},{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[3,6,11,12]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,12,18]}],"pathway":[{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,8,9]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[11,16]}],"complexes":[],"partners":["YWHAE","CALR","NOS3","FZD4"],"other_free_text":[]},"mechanistic_narrative":"ATP2B1 (PMCA1) is a plasma membrane Ca²⁺-ATPase that actively extrudes cytoplasmic Ca²⁺ to maintain intracellular calcium homeostasis, serving essential roles in embryonic development, cardiovascular regulation, immune cell function, and neuronal health. In vascular smooth muscle cells, PMCA1 controls resting and agonist-stimulated Ca²⁺ levels, and its loss elevates blood pressure through increased vasoconstriction and compensatory L-type Ca²⁺ channel upregulation; in endothelial cells, it tonically suppresses Ca²⁺/calmodulin-dependent eNOS activation, thereby modulating NO production and insulin-mediated Akt signaling [PMID:22311909, PMID:24805951, PMID:29416109]. PMCA1 is the sole functional PMCA isoform in B cells and is required for normal B-cell development, while its loss in CD4⁺ T cells causes hyperactivation and colitis; in the intestine, it mediates vitamin D–dependent active Ca²⁺ absorption essential for bone mineralization [PMID:33098669, PMID:38507609, PMID:26392310]. De novo pathogenic missense variants in ATP2B1 cause neurodevelopmental delay (MRD66) through reduced Ca²⁺ export capacity and cytoplasmic mislocalization of the mutant protein, and biallelic loss-of-function variants additionally produce primary hypoparathyroidism [PMID:35358416, PMID:37926713]."},"prefetch_data":{"uniprot":{"accession":"P20020","full_name":"Plasma membrane calcium-transporting ATPase 1","aliases":["Plasma membrane calcium ATPase isoform 1","PMCA1","Plasma membrane calcium pump isoform 1"],"length_aa":1220,"mass_kda":134.7,"function":"Catalyzes the hydrolysis of ATP coupled with the transport of calcium from the cytoplasm to the extracellular space thereby maintaining intracellular calcium homeostasis (PubMed:35358416). Plays a role in blood pressure regulation through regulation of intracellular calcium concentration and nitric oxide production leading to regulation of vascular smooth muscle cells vasoconstriction. Positively regulates bone mineralization through absorption of calcium from the intestine. Plays dual roles in osteoclast differentiation and survival by regulating RANKL-induced calcium oscillations in preosteoclasts and mediating calcium extrusion in mature osteoclasts (By similarity). Regulates insulin sensitivity through calcium/calmodulin signaling pathway by regulating AKT1 activation and NOS3 activation in endothelial cells (PubMed:29104511). May play a role in synaptic transmission by modulating calcium and proton dynamics at the synaptic vesicles","subcellular_location":"Cell membrane; Basolateral cell membrane; Synapse; Presynaptic cell membrane; Cytoplasmic vesicle, secretory vesicle, synaptic vesicle membrane","url":"https://www.uniprot.org/uniprotkb/P20020/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ATP2B1","classification":"Not Classified","n_dependent_lines":176,"n_total_lines":1208,"dependency_fraction":0.1456953642384106},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000070961","cell_line_id":"CID000876","localizations":[{"compartment":"membrane","grade":3},{"compartment":"vesicles","grade":1}],"interactors":[{"gene":"BSG","stoichiometry":4.0},{"gene":"TRIM71","stoichiometry":0.2},{"gene":"ATP2B3","stoichiometry":0.2},{"gene":"NPTN;DKFZP566H1924","stoichiometry":0.2},{"gene":"CALM2;CALM3;CALM1","stoichiometry":0.2},{"gene":"ACSL3","stoichiometry":0.2},{"gene":"CALM1","stoichiometry":0.2},{"gene":"CALM2","stoichiometry":0.2},{"gene":"CALM3","stoichiometry":0.2},{"gene":"HSP90B1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID000876","total_profiled":1310},"omim":[{"mim_id":"621016","title":"NEURODEVELOPMENTAL DISORDER WITH VARIABLE FAMILIAL HYPERCHOLANEMIA; NEDFHCA","url":"https://www.omim.org/entry/621016"},{"mim_id":"619910","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, AUTOSOMAL DOMINANT 66; MRD66","url":"https://www.omim.org/entry/619910"},{"mim_id":"617167","title":"SOLUTE CARRIER FAMILY 35, MEMBER G1; SLC35G1","url":"https://www.omim.org/entry/617167"},{"mim_id":"610277","title":"ORAI CALCIUM RELEASE-ACTIVATED CALCIUM MODULATOR 1; ORAI1","url":"https://www.omim.org/entry/610277"},{"mim_id":"606680","title":"TRANSIENT RECEPTOR POTENTIAL CATION CHANNEL, SUBFAMILY V, MEMBER 6; TRPV6","url":"https://www.omim.org/entry/606680"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone 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ablation of plasma membrane Ca2+-ATPase (PMCA) 1 and 4 indicates a major housekeeping function for PMCA1 and a critical role in hyperactivated sperm motility and male fertility for PMCA4.","date":"2004","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/15178683","citation_count":271,"is_preprint":false},{"pmid":"20921432","id":"PMC_20921432","title":"Common variants in the ATP2B1 gene are associated with susceptibility to hypertension: the Japanese Millennium Genome Project.","date":"2010","source":"Hypertension (Dallas, Tex. : 1979)","url":"https://pubmed.ncbi.nlm.nih.gov/20921432","citation_count":81,"is_preprint":false},{"pmid":"22311909","id":"PMC_22311909","title":"Mice lacking hypertension candidate gene ATP2B1 in vascular smooth muscle cells show significant blood pressure elevation.","date":"2012","source":"Hypertension (Dallas, Tex. : 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housekeeping/developmental function for PMCA1, while heterozygous mice are overtly normal.\",\n      \"method\": \"Gene knockout (null mutation) in mice\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined lethal phenotype, replicated by multiple subsequent labs\",\n      \"pmids\": [\"15178683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A Leu-Ile motif in the 'b'-tail splice variant of PMCA1 promotes basolateral sorting of PMCA1b in mammalian hair cells, while PMCA1 is expressed in the basolateral plasma membrane (not apical stereocilia) of inner ear hair cells.\",\n      \"method\": \"Subcellular localization by immunofluorescence/targeting assays, splice variant analysis in hair cells\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — direct localization experiment with functional consequence (targeting motif identified), replicated across isoforms\",\n      \"pmids\": [\"16803870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The 14-3-3ε protein physically interacts with PMCA1 (co-immunoprecipitation and GST pull-down), and this interaction inhibits PMCA1 Ca2+-pumping activity, impairing cellular Ca2+ re-establishment after InsP3-induced Ca2+ transients.\",\n      \"method\": \"Co-immunoprecipitation, GST pull-down, aequorin-based Ca2+ measurement in CHO cells co-expressing 14-3-3ε and PMCA1\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — reciprocal pull-down plus functional Ca2+ assay in same study\",\n      \"pmids\": [\"18029012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Vascular smooth muscle cell-specific knockout of Atp2b1 in mice causes significantly elevated blood pressure, increased intracellular Ca2+ concentration in VSMCs at basal and phenylephrine-stimulated conditions, and increased phenylephrine-induced vasoconstriction, demonstrating that PMCA1 regulates blood pressure through Ca2+ handling in VSMCs.\",\n      \"method\": \"Cre-loxP conditional knockout in vascular smooth muscle cells, radiotelemetric blood pressure measurement, intracellular Ca2+ imaging, vascular ring contraction assays\",\n      \"journal\": \"Hypertension (Dallas, Tex. : 1979)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with multiple orthogonal phenotypic readouts (BP, Ca2+, vasoconstriction)\",\n      \"pmids\": [\"22311909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"siRNA-mediated silencing of Atp2b1 in mice raises blood pressure, increases wall:lumen ratio of mesenteric arteries, and enhances myogenic and contractile responses to phenylephrine, confirming ATP2B1 controls blood pressure via vascular Ca2+ regulation.\",\n      \"method\": \"siRNA knockdown via tail-vein injection, blood pressure measurement, pressure myography, vascular contractility assays\",\n      \"journal\": \"Journal of hypertension\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — in vivo siRNA KD with multiple vascular phenotype readouts\",\n      \"pmids\": [\"23666421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Systemic heterozygous Atp2b1-null mice have elevated blood pressure associated with impaired eNOS phosphorylation (Ser-1177) and reduced nitric oxide production in endothelial cells, and increased phenylephrine-induced vasoconstriction that is normalized by NOS inhibition, establishing that PMCA1 regulates blood pressure partly through endothelial eNOS/NO signaling.\",\n      \"method\": \"Heterozygous knockout mice, radiotelemetric blood pressure, vascular ring assays with NOS inhibitor, eNOS phosphorylation by Western blot, NO measurement\",\n      \"journal\": \"Journal of hypertension\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods linking PMCA1 reduction to eNOS/NO pathway\",\n      \"pmids\": [\"24805951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Intestine-specific deletion of Atp2b1 in mice (villin-Cre) reduces bone mineral density, impairs active intestinal calcium transport, and abolishes the normal upregulation of calcium absorption in response to 1α,25(OH)2D3, demonstrating that intestinal PMCA1 is required for vitamin D-dependent active Ca2+ absorption.\",\n      \"method\": \"Cre-loxP intestine-specific knockout, bone mineral density by DXA, active intestinal Ca2+ transport assay, 1,25(OH)2D3 administration\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with multiple physiological readouts (BMD, Ca2+ transport, vitamin D response)\",\n      \"pmids\": [\"26392310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Vascular smooth muscle cell-specific Atp2b1 KO mice show upregulation of L-type calcium channels in VSMCs and greater antihypertensive response to calcium channel blockers (CCBs) compared to other drug classes, indicating that PMCA1 loss leads to compensatory L-type Ca2+ channel upregulation as a primary driver of elevated vascular Ca2+ and blood pressure.\",\n      \"method\": \"Conditional KO mice, blood pressure monitoring under antihypertensive drug treatment, L-type Ca2+ channel mRNA/protein expression by qPCR and Western blot\",\n      \"journal\": \"Hypertension research : official journal of the Japanese Society of Hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — single lab conditional KO with pharmacological and molecular readouts\",\n      \"pmids\": [\"29046519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Silencing ATP2B1 in HUVECs increases intracellular Ca2+, activates the Ca2+/calmodulin/eNOS signaling pathway, and enhances insulin-induced Akt (Ser473) phosphorylation; effects are abolished by Ca2+ chelation (BAPTA-AM), calmodulin antagonism (W7), or eNOS inhibition (L-NAME), demonstrating that PMCA1 regulates endothelial insulin sensitivity via Ca2+/calmodulin/eNOS/Akt.\",\n      \"method\": \"siRNA knockdown in HUVECs, intracellular Ca2+ imaging, Akt phosphorylation by Western blot, pharmacological inhibitors\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — single lab, multiple orthogonal inhibitor and KD approaches confirming pathway\",\n      \"pmids\": [\"29104511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ATP2B1 silencing in HUVECs increases intracellular Ca2+, enhances calmodulin-eNOS interaction, and increases NO production under basal conditions; effects are reversed by Ca2+ chelation or calmodulin antagonism, establishing that PMCA1 tonically suppresses eNOS activity via Ca2+/calmodulin signaling in endothelial cells.\",\n      \"method\": \"siRNA knockdown in HUVECs, NO measurement, eNOS activity assay, Ca2+ imaging, pharmacological inhibitors\",\n      \"journal\": \"Hypertension research : official journal of the Japanese Society of Hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — single lab, multiple orthogonal methods confirming Ca2+/calmodulin/eNOS mechanism\",\n      \"pmids\": [\"29416109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Systemic heterozygous Atp2b1-null mice develop hypocalcemia associated with reduced PTH secretion and hypercalciuria, and reduced ATP2B1 expression in kidney and small intestine, demonstrating that PMCA1 contributes to systemic calcium homeostasis beyond intracellular Ca2+ regulation.\",\n      \"method\": \"Heterozygous KO mice, serum Ca2+/PTH measurement, bone mineral density, urinary Ca2+ excretion, tissue qPCR/Western blot\",\n      \"journal\": \"Hypertension research : official journal of the Japanese Society of Hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — single lab, multiple physiological readouts in vivo\",\n      \"pmids\": [\"29950683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Conditional knockout of PMCA1 (Atp2b1) in B cells causes greatly reduced numbers of follicular B cells, marginal zone B cells, and B-1a cells, with elevated basal and ER Ca2+ and reduced Ca2+ clearance; PMCA4 is not expressed in B cells and its KO has no effect, establishing PMCA1 as the sole PMCA isoform required for B-cell Ca2+ homeostasis and normal B-cell development.\",\n      \"method\": \"Conditional KO mice (B cell-specific), flow cytometry, Western blot for PMCA isoform expression, intracellular Ca2+ measurement\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with multiple orthogonal readouts (cell numbers, Ca2+ handling, isoform expression), confirmed with PMCA4 KO comparison\",\n      \"pmids\": [\"33098669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"De novo missense variants in ATP2B1 in human patients cause neurodevelopmental delay; all nine tested missense variants introduced into HEK293 cells reduce Ca2+ export capacity compared to wild-type and show incorrect intracellular localization, demonstrating that loss of PMCA1 function (reduced Ca2+ export and mislocalization) is the pathomechanism for this neurodevelopmental disorder.\",\n      \"method\": \"Ca2+ imaging in transfected HEK293 cells, subcellular localization by confocal microscopy, 3D structural protein modeling, patient cohort\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 — functional Ca2+ assays and localization for all 9 variants, multiple orthogonal methods, replicated across 12 unrelated probands\",\n      \"pmids\": [\"35358416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In stretched myoblasts, elevated calreticulin (CRT) suppresses PMCA1 activity via calmodulin inhibition (CRT-CaM-PMCA1 pathway), while reduced PMCA1 activity promotes CRT expression via p38MAPK activation (PMCA1-p38MAPK-CRT pathway), forming a positive feedback loop that amplifies intracellular Ca2+ accumulation and apoptosis; PMCA1 overexpression or CRT knockdown attenuates stretch-induced Ca2+ overload and apoptosis.\",\n      \"method\": \"Mechanical stretch in myoblasts, CRT/PMCA1 overexpression and knockdown, intracellular Ca2+ measurement, apoptosis assays, pharmacological inhibitors of CaM and p38MAPK\",\n      \"journal\": \"Apoptosis : an international journal on programmed cell death\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — single lab, multiple gain/loss-of-function approaches and pharmacological dissection of pathway\",\n      \"pmids\": [\"35976579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Compound heterozygous ATP2B1 variants (splice-site causing nonsense-mediated decay + missense p.Val980Leu) cause a biallelic loss-of-function phenotype with primary hypoparathyroidism and neurodevelopmental deficits; the missense variant in correctly-spliced mRNA causes decreased cellular Ca2+ extrusion as shown by functional Ca2+ assay, and reduced total ATP2B1 protein in patient fibroblasts.\",\n      \"method\": \"Trio exome sequencing, RT-PCR on fibroblast mRNA showing aberrant splicing and NMD, Ca2+ extrusion functional assay, immunoblotting\",\n      \"journal\": \"European journal of human genetics : EJHG\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — functional Ca2+ assay plus RT-PCR splicing validation and protein quantification in patient cells\",\n      \"pmids\": [\"37926713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SARS-CoV-2 infection activates PI3K/Akt signaling, inactivates FOXO3 transcription factor, and transcriptionally inhibits ATP2B1 (and ATP2A1) expression; pharmacological maintenance of ATP2B1 expression with a caloxin-derivative compound (PI-7) reduces intracellular Ca2+ and impairs SARS-CoV-2 replication, placing ATP2B1 downstream of PI3K/Akt/FOXO3 in viral replication-associated Ca2+ regulation.\",\n      \"method\": \"SARS-CoV-2 infection model, PI3K/Akt pathway inhibition, FOXO3 activity assays, intracellular Ca2+ measurement, viral replication assay, pharmacological compound PI-7\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — single lab, multiple pathway and functional readouts linking SARS-CoV-2/PI3K/Akt/FOXO3 axis to ATP2B1 regulation\",\n      \"pmids\": [\"38816514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Conditional knockout of ATP2B1 in CD4+ T cells causes colitis, elevated T-bet (Th1) and GATA3 (Th2) expression in blood CD4+ T cells, increased TNFα and gp91 (oxidative stress marker) in colon, and altered stool water/lipid content, demonstrating that PMCA1-mediated Ca2+ extrusion in CD4+ T cells is required to prevent T cell hyperactivation and colitis.\",\n      \"method\": \"CD4+ T cell-specific conditional KO (Cre-loxP), flow cytometry, qPCR, disease phenotype assessment (colon length, diarrhea, histology)\",\n      \"journal\": \"Inflammatory bowel diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — conditional KO with defined cellular and molecular phenotype, single lab\",\n      \"pmids\": [\"38507609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ATP2B1 (PMCA1) was identified as a FZD4 proximity interactor in endothelial cells; ATP2B1 depletion increases endothelial Ca2+, attenuates Norrin/FZD4 β-catenin signaling through calcineurin/NFAT activation, and endothelial-specific Atp2b1 deletion causes retinal vascular defects consistent with impaired Norrin/FZD4 signaling; in developing brain, Atp2b1 endothelial KO exacerbates WNT7A/B pathway LOF phenotypes in Gpr124 KO mice.\",\n      \"method\": \"Proximity biotinylation (BioID), endothelial-specific conditional KO, retinal vascular phenotype analysis, Ca2+ measurement, calcineurin/NFAT pharmacological inhibition, genetic epistasis (Atp2b1/Gpr124 double KO)\",\n      \"journal\": \"bioRxiv : the preprint server for biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — proximity biotinylation + conditional KO + genetic epistasis + pharmacological rescue in single study; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"40777252\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"A de novo missense variant p.Thr714Pro in ATP2B1 causes profound cytoplasmic mislocalization of PMCA1 (vs. plasma membrane localization of WT) and a 2.07-fold increase in basal intracellular Ca2+ in HEK293T cells, confirming impaired membrane trafficking and calcium dyshomeostasis as the core pathomechanism for MRD66.\",\n      \"method\": \"Whole-exome sequencing, confocal imaging of mScarlet-tagged WT and mutant ATP2B1 in HEK293T cells, Fluo-4 AM intracellular Ca2+ measurement\",\n      \"journal\": \"Experimental biology and medicine (Maywood, N.J.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 — direct localization imaging plus Ca2+ functional assay with mutant vs. WT comparison, single lab single variant\",\n      \"pmids\": [\"41853798\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The 1.7-kb promoter region of the human PMCA1 (ATP2B1) gene mediates transcriptional downregulation (transrepression) by 1,25-dihydroxyvitamin D3 in ROS 17/2.8 osteoblast cells but not MDBK cells, indicating tissue-specific vitamin D-dependent transcriptional regulation; EMSA showed that the candidate VDRE in this region does not bind VDR/RXRα, suggesting the positive regulatory VDRE lies outside this region.\",\n      \"method\": \"Luciferase reporter assays with PMCA1 promoter deletion constructs, EMSA with VDR/RXRα nuclear extracts\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 — promoter reporter assays with multiple deletion constructs and EMSA, single lab\",\n      \"pmids\": [\"11062020\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATP2B1/PMCA1 is a plasma membrane Ca2+-ATPase that actively extrudes Ca2+ from cells to maintain intracellular Ca2+ homeostasis; it is essential for embryonic development (global KO is lethal), regulates blood pressure by controlling VSMC Ca2+ and vascular tone and by sustaining endothelial eNOS/NO production, mediates intestinal Ca2+ absorption required for bone mineralization, is required for B-cell and CD4+ T-cell Ca2+ homeostasis and normal immune development, facilitates Norrin/WNT7A/B-FZD4 β-catenin signaling in CNS endothelial cells, and is inhibited by 14-3-3ε interaction; pathogenic missense variants cause neurodevelopmental delay by reducing Ca2+ export capacity and/or causing protein mislocalization to the cytoplasm.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ATP2B1 (PMCA1) is a plasma membrane Ca²⁺-ATPase that actively extrudes cytoplasmic Ca²⁺ to maintain intracellular calcium homeostasis, serving essential roles in embryonic development, cardiovascular regulation, immune cell function, and neuronal health. In vascular smooth muscle cells, PMCA1 controls resting and agonist-stimulated Ca²⁺ levels, and its loss elevates blood pressure through increased vasoconstriction and compensatory L-type Ca²⁺ channel upregulation; in endothelial cells, it tonically suppresses Ca²⁺/calmodulin-dependent eNOS activation, thereby modulating NO production and insulin-mediated Akt signaling [PMID:22311909, PMID:24805951, PMID:29416109]. PMCA1 is the sole functional PMCA isoform in B cells and is required for normal B-cell development, while its loss in CD4⁺ T cells causes hyperactivation and colitis; in the intestine, it mediates vitamin D–dependent active Ca²⁺ absorption essential for bone mineralization [PMID:33098669, PMID:38507609, PMID:26392310]. De novo pathogenic missense variants in ATP2B1 cause neurodevelopmental delay (MRD66) through reduced Ca²⁺ export capacity and cytoplasmic mislocalization of the mutant protein, and biallelic loss-of-function variants additionally produce primary hypoparathyroidism [PMID:35358416, PMID:37926713].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Before transcriptional regulation of ATP2B1 was understood, promoter-reporter studies showed that 1,25-dihydroxyvitamin D₃ transrepresses the PMCA1 promoter in a tissue-specific manner in osteoblasts, establishing that ATP2B1 expression is hormonally regulated at the transcriptional level.\",\n      \"evidence\": \"Luciferase reporter assays with promoter deletions and EMSA in ROS 17/2.8 osteoblasts vs. MDBK cells\",\n      \"pmids\": [\"11062020\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The positive VDRE element was not mapped\", \"Mechanism of transrepression (indirect vs. direct VDR involvement) unresolved\", \"Single cell line study\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrating that PMCA1 is non-redundant with other PMCA isoforms, homozygous Atp2b1 knockout in mice was embryolethal, establishing an essential developmental role.\",\n      \"evidence\": \"Gene-targeted null mutation in mice\",\n      \"pmids\": [\"15178683\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Embryonic stage and cause of lethality not fully characterized\", \"Whether lethality is due to Ca²⁺ overload, signaling defects, or structural failure was unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Addressing how PMCA1 is directed to specific membrane domains, a Leu-Ile motif in the 'b'-tail splice variant was shown to mediate basolateral sorting in hair cells, revealing isoform-specific polarized trafficking.\",\n      \"evidence\": \"Immunofluorescence localization and targeting assays in inner ear hair cells\",\n      \"pmids\": [\"16803870\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether the same motif governs sorting in other polarized epithelia was not tested\", \"Adaptor proteins recognizing the Leu-Ile motif not identified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identifying a regulatory partner, 14-3-3ε was shown to physically interact with PMCA1 and inhibit its Ca²⁺-pumping activity, establishing a protein–protein mechanism for PMCA1 functional modulation.\",\n      \"evidence\": \"Co-immunoprecipitation, GST pull-down, and aequorin-based Ca²⁺ assay in CHO cells\",\n      \"pmids\": [\"18029012\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Binding site on PMCA1 not mapped\", \"Physiological context for 14-3-3ε inhibition in vivo not established\", \"Whether phosphorylation-dependent\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Conditional knockout and in vivo knockdown established that PMCA1 in vascular smooth muscle cells directly controls intracellular Ca²⁺ and blood pressure, mechanistically linking the GWAS-associated ATP2B1 locus to hypertension.\",\n      \"evidence\": \"VSMC-specific Cre-loxP KO with telemetric BP, Ca²⁺ imaging, and vascular ring assays; corroborated by systemic siRNA knockdown\",\n      \"pmids\": [\"22311909\", \"23666421\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of VSMC vs. endothelial PMCA1 to total BP effect not dissected in these studies\", \"Human genetic validation for VSMC-specific mechanism lacking\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Heterozygous Atp2b1-null mice revealed an endothelial mechanism: reduced PMCA1 impairs eNOS Ser-1177 phosphorylation and NO production, showing PMCA1 regulates vascular tone through both smooth muscle Ca²⁺ handling and endothelial NO signaling.\",\n      \"evidence\": \"Heterozygous KO mice with telemetric BP, vascular ring assays ± NOS inhibitor, eNOS phosphorylation Western blot, NO measurement\",\n      \"pmids\": [\"24805951\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The paradox that PMCA1 loss raises Ca²⁺ yet impairs Ca²⁺/calmodulin-dependent eNOS was not fully reconciled at this stage\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Intestine-specific Atp2b1 deletion demonstrated that PMCA1 is the rate-limiting basolateral Ca²⁺ pump for vitamin D–dependent active Ca²⁺ absorption, linking it to bone mineralization.\",\n      \"evidence\": \"Villin-Cre intestinal KO, DXA bone mineral density, intestinal Ca²⁺ transport assay ± 1,25(OH)₂D₃\",\n      \"pmids\": [\"26392310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of PMCA1 vs. NCX1 at the basolateral membrane not quantified\", \"Whether dietary Ca²⁺ rescue is possible not tested\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Further mechanistic dissection showed that VSMC-specific PMCA1 loss upregulates L-type Ca²⁺ channels, explaining enhanced CCB sensitivity, and that in endothelial cells PMCA1 silencing activates a Ca²⁺/calmodulin/eNOS/Akt cascade affecting insulin signaling.\",\n      \"evidence\": \"Conditional KO mice with pharmacological antihypertensive testing; siRNA in HUVECs with Ca²⁺ imaging, Akt phosphorylation, and pathway inhibitors\",\n      \"pmids\": [\"29046519\", \"29104511\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"L-type channel upregulation mechanism (transcriptional vs. trafficking) not defined\", \"In vivo validation of endothelial insulin sensitivity link absent\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Basal tonic regulation of eNOS by PMCA1 was confirmed: PMCA1 silencing in endothelial cells increases calmodulin–eNOS interaction and NO production even without agonist stimulation, and heterozygous KO mice develop systemic hypocalcemia with reduced PTH and hypercalciuria.\",\n      \"evidence\": \"siRNA in HUVECs with NO/eNOS assays; heterozygous KO mice with serum Ca²⁺/PTH, urinary Ca²⁺\",\n      \"pmids\": [\"29416109\", \"29950683\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether hypocalcemia is primary (renal/intestinal Ca²⁺ loss) or secondary (PTH deficiency) not resolved\", \"Single-lab findings for both\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"B-cell-specific Atp2b1 KO revealed that PMCA1 is the sole PMCA isoform expressed in B cells and is required for normal B-cell development; its loss elevates basal and ER Ca²⁺ and depletes follicular, marginal zone, and B-1a cell populations.\",\n      \"evidence\": \"B-cell-specific conditional KO, flow cytometry, PMCA isoform Western blot, intracellular Ca²⁺ measurement\",\n      \"pmids\": [\"33098669\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether B-cell functional defects (antibody responses, class switching) accompany the numerical reduction not assessed\", \"Downstream Ca²⁺-dependent transcriptional programs not identified\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"De novo ATP2B1 missense variants were established as the cause of a neurodevelopmental disorder (MRD66): all tested variants reduced Ca²⁺ export and showed cytoplasmic mislocalization, defining the human disease mechanism.\",\n      \"evidence\": \"Ca²⁺ imaging and confocal localization of 9 variants in HEK293 cells across 12 unrelated probands, structural modeling\",\n      \"pmids\": [\"35358416\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Neuronal-specific consequences of variants not studied\", \"Genotype–phenotype correlations across variant severity not established\", \"Animal model recapitulation of neurodevelopmental phenotype not reported\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Biallelic ATP2B1 loss-of-function (compound heterozygous splice-site + missense) was shown to cause primary hypoparathyroidism alongside neurodevelopmental deficits, expanding the clinical spectrum of PMCA1 deficiency.\",\n      \"evidence\": \"Trio exome sequencing, RT-PCR showing NMD of splice variant, Ca²⁺ extrusion assay and immunoblotting in patient fibroblasts\",\n      \"pmids\": [\"37926713\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single family — replication needed\", \"Whether parathyroid Ca²⁺ sensing defect or PTH secretion defect not mechanistically distinguished\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"CD4⁺ T-cell-specific Atp2b1 KO caused spontaneous colitis with Th1/Th2 hyperactivation, establishing PMCA1 as a Ca²⁺-dependent brake on T-cell inflammatory signaling in the gut.\",\n      \"evidence\": \"CD4-Cre conditional KO mice, flow cytometry, colon histology, qPCR for T-bet/GATA3/TNFα\",\n      \"pmids\": [\"38507609\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether regulatory T-cell function is impaired not tested\", \"Ca²⁺/NFAT pathway involvement in T-cell hyperactivation not directly measured\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"SARS-CoV-2 was shown to downregulate ATP2B1 via PI3K/Akt/FOXO3 axis, and pharmacological restoration of PMCA1 expression reduced viral replication, placing ATP2B1 in a host Ca²⁺ defense pathway exploited by the virus.\",\n      \"evidence\": \"SARS-CoV-2 infection model with PI3K/Akt inhibition, FOXO3 activity assays, Ca²⁺ measurement, viral replication assay\",\n      \"pmids\": [\"38816514\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether this extends to other viruses not tested\", \"Direct FOXO3 binding to ATP2B1 promoter not shown by ChIP\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include the structural basis for pathogenic variant mislocalization, neuronal-specific consequences of PMCA1 loss, the mechanism by which PMCA1 supports Norrin/FZD4 β-catenin signaling in CNS endothelium, and whether PMCA1 pharmacological modulation has therapeutic potential for hypertension or neurodevelopmental disorders.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No high-resolution structure of human PMCA1 available\", \"Neuron-specific conditional KO phenotype not reported\", \"Norrin/FZD4 interaction mechanism from preprint awaits peer review\", \"No therapeutic PMCA1 activator validated in vivo\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 2, 3, 11, 12]},\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [3, 6, 11, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 12, 18]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0382551\", \"supporting_discovery_ids\": [3, 6, 11, 12]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 8, 9]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [11, 16]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"YWHAE\",\n      \"CALR\",\n      \"NOS3\",\n      \"FZD4\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}