{"gene":"ATP2B1","run_date":"2026-06-09T22:02:44","timeline":{"discoveries":[{"year":2004,"finding":"Homozygous knockout of Atp2b1 (PMCA1) causes embryolethality in mice, indicating an essential housekeeping or developmental function. Heterozygous knockout shows no overt phenotype. PMCA1 is distinct from PMCA4 in this essential role.","method":"Targeted gene knockout (null mutation) in mice; embryonic lethality readout","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined developmental phenotype, replicated across multiple genetic backgrounds, published in peer-reviewed journal","pmids":["15178683"],"is_preprint":false},{"year":2006,"finding":"A Leu-Ile motif in 'b'-tail splice variants of PMCA1 promotes basolateral sorting in hair cells, whereas apical targeting of PMCA2 depends on the size of the A-site-spliced insert. PMCA1 is localized to the basolateral plasma membrane of hair cells, while PMCA2 is localized to stereocilia.","method":"Subcellular localization studies and molecular dissection of targeting motifs in mammalian hair cells; splice-variant expression analysis","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization experiment with functional domain dissection, single lab, multiple splice variants tested","pmids":["16803870"],"is_preprint":false},{"year":2007,"finding":"14-3-3epsilon protein interacts with PMCA1 (and PMCA3) and inhibits their Ca2+-pumping activity. The interaction is phosphorylation-independent and was confirmed by co-immunoprecipitation in HeLa cells and GST-pulldown with fusion proteins. Co-expression of 14-3-3epsilon with PMCA1 in CHO cells decreased the ability of cells to restore basal Ca2+ concentration after an InsP3-induced Ca2+ transient.","method":"Co-immunoprecipitation in HeLa cells; GST pulldown with fusion proteins; aequorin-based Ca2+ measurement in CHO cells co-expressing 14-3-3epsilon and PMCA1","journal":"Cell calcium","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and pulldown plus functional Ca2+ assay, single lab, multiple orthogonal methods","pmids":["18029012"],"is_preprint":false},{"year":2000,"finding":"The 1.7-kb promoter region of the human PMCA1 gene mediates transcriptional downregulation by 1,25-dihydroxyvitamin D3 in ROS 17/2.8 osteosarcoma cells but not MDBK cells, demonstrating tissue-specific sensitivity. EMSA analysis showed that a candidate VDRE sequence in the PMCA1 promoter did not interact with VDR or RXRalpha, suggesting any positive regulatory VDRE lies outside the 1.7-kb core promoter.","method":"Luciferase reporter gene assays with promoter deletion constructs; EMSA with nuclear extracts from COS-1 cells expressing hVDR and hRXRalpha","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with multiple deletion constructs plus EMSA, single lab, two orthogonal methods","pmids":["11062020"],"is_preprint":false},{"year":2012,"finding":"Vascular smooth muscle cell (VSMC)-specific knockout of ATP2B1 in mice causes significantly elevated blood pressure (measured by tail-cuff and radiotelemetry), increased intracellular calcium concentration in VSMCs under basal and phenylephrine-stimulated conditions, and increased phenylephrine-induced vasoconstriction. Na+-Ca2+ exchanger isoform 1 expression was decreased and ATP2B4 expression was increased in KO VSMCs.","method":"Cre-loxP conditional knockout in VSMCs; radiotelemetry and tail-cuff blood pressure measurement; intracellular calcium measurement in cultured VSMCs; vascular ring contraction assays","journal":"Hypertension (Dallas, Tex. : 1979)","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined cellular phenotype (elevated Ca2+, increased vasoconstriction, elevated BP), multiple orthogonal readouts, peer-reviewed","pmids":["22311909"],"is_preprint":false},{"year":2013,"finding":"Systemic siRNA-mediated silencing of Atp2b1 in mice via tail vein injection elevated blood pressure, increased mesenteric artery wall:lumen ratio, enhanced myogenic responses to pressure, and increased contractile responses to phenylephrine, demonstrating that ATP2B1 regulates blood pressure through control of vascular calcium and contractility.","method":"In vivo siRNA knockdown via tail vein injection; blood pressure measurement; vascular morphometry; myogenic and contractile response assays","journal":"Journal of hypertension","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KD with defined vascular phenotype, single lab, multiple readouts","pmids":["23666421"],"is_preprint":false},{"year":2014,"finding":"Systemic heterozygous ATP2B1 null mice exhibit elevated blood pressure, increased phenylephrine-induced vasoconstriction (abolished by NOS inhibitor), attenuated acetylcholine-induced vasorelaxation, reduced phosphorylation of eNOS at Ser-1177, and decreased nitric oxide production in endothelial cells and aorta. Neural NOS expression in VSMCs was not significantly different. This demonstrates that ATP2B1 haploinsufficiency impairs endothelial NOS activity and NO production.","method":"Heterozygous KO mice; radiotelemetric BP measurement; vascular ring contraction/relaxation assays with NOS inhibitor; eNOS phosphorylation by western blot; NO measurement in cultured endothelial cells and aorta","journal":"Journal of hypertension","confidence":"High","confidence_rationale":"Tier 2 / Strong — heterozygous KO with multiple orthogonal phenotypic and molecular readouts (eNOS phosphorylation, NO production, vascular function), peer-reviewed","pmids":["24805951"],"is_preprint":false},{"year":2015,"finding":"Intestinal epithelial cell-specific knockout of Pmca1 (Atp2b1) in mice results in reduced bone mineral density, impaired active intestinal calcium transport, and failure to upregulate calcium absorption in response to 1,25-dihydroxyvitamin D3, demonstrating that intestinal PMCA1 is required for active calcium absorption and vitamin D-responsive calcium homeostasis.","method":"Villin-Cre intestinal conditional knockout; bone mineral density by DXA; active intestinal calcium transport assay; PTH and 1,25(OH)2D3 measurements; urinary phosphorus measurement","journal":"Biochemical and biophysical research communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with specific physiological readouts (bone mineral density, active Ca2+ transport, vitamin D responsiveness), multiple orthogonal measurements","pmids":["26392310"],"is_preprint":false},{"year":2017,"finding":"VSMC-specific ATP2B1 KO mice show enhanced blood pressure reduction with a single injection of nicardipine (L-type Ca2+ channel blocker) compared to ARB or alpha-blocker, and L-type calcium channel mRNA and protein are upregulated in KO VSMCs. Long-term amlodipine (CCB) but not ARB significantly decreased BP in KO vs. control mice. Neural NOS expression and urinary NO production were unchanged. This places ATP2B1 upstream of L-type Ca2+ channel upregulation as the primary mechanism of hypertension in these mice.","method":"VSMC conditional KO mice; drug treatment with CCB, ARB, alpha-blocker; radiotelemetric BP measurement; quantitative RT-PCR and western blot for L-type Ca2+ channel and nNOS","journal":"Hypertension research : official journal of the Japanese Society of Hypertension","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with pharmacological dissection and molecular readout, single lab, multiple methods","pmids":["29046519"],"is_preprint":false},{"year":2017,"finding":"ATP2B1 gene silencing in HUVECs elevates intracellular Ca2+ concentration, increases eNOS activity and NO production under basal conditions via the Ca2+/calmodulin pathway, as confirmed by BAPTA-AM (calcium chelator) and W7 (calmodulin antagonist) abolishing the effect.","method":"siRNA knockdown in HUVECs; intracellular Ca2+ measurement; NO and eNOS activity assays; pharmacological inhibition with BAPTA-AM, W7","journal":"Hypertension research : official journal of the Japanese Society of Hypertension","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with pharmacological pathway dissection using two inhibitors, single lab","pmids":["29416109"],"is_preprint":false},{"year":2017,"finding":"ATP2B1 gene silencing in HUVECs elevates intracellular Ca2+ and increases insulin-induced Akt activation (insulin sensitivity) via the Ca2+/calmodulin/eNOS/Akt signaling pathway. The enhanced insulin sensitivity was abolished by BAPTA-AM, W7 (calmodulin antagonist), and L-NAME (eNOS inhibitor), demonstrating the pathway: elevated Ca2+ → calmodulin → eNOS → Akt.","method":"siRNA knockdown in HUVECs; insulin-stimulated Akt phosphorylation by western blot; pharmacological inhibition with BAPTA-AM, W7, L-NAME; intracellular Ca2+ measurement","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA KD with epistasis established by three orthogonal pharmacological inhibitors, single lab","pmids":["29104511"],"is_preprint":false},{"year":2017,"finding":"Heterozygous PMCA1 null mice develop elevated blood pressure at ≥12 months of age (not at 6 or 9 months), preceded by eutrophic remodelling of small mesenteric arteries (decreased lumen diameter, increased wall thickness) and increased mesenteric artery intrinsic tone and global intracellular calcium at both 6 and 18 months. Structural arterial changes precede the BP elevation.","method":"Heterozygous PMCA1 KO mice; conscious BP measurement at multiple ages; pressure myography of mesenteric arteries; intracellular Ca2+ measurement","journal":"Aging cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse model with longitudinal BP measurement and vascular functional phenotyping, single lab","pmids":["28795531"],"is_preprint":false},{"year":2018,"finding":"Systemic heterozygous ATP2B1+/- mice exhibit hypocalcemia, reduced renal and intestinal ATP2B1 expression, hypercalciuria, lower intact-PTH levels, and increased bone mineral density. This demonstrates that ATP2B1 is required not only for intracellular Ca2+ regulation but also for systemic calcium homeostasis and PTH secretion.","method":"Heterozygous KO mice; serum and urinary calcium/PTH measurement; bone mineral density measurement; RT-PCR for tissue ATP2B1 expression","journal":"Hypertension research : official journal of the Japanese Society of Hypertension","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with multiple systemic calcium homeostasis readouts, single lab","pmids":["29950683"],"is_preprint":false},{"year":2020,"finding":"Conditional knockout of Pmca1 (Atp2b1) in B cells results in greatly reduced numbers of splenic follicular B cells, marginal zone B cells, and peritoneal B-1a cells, elevated basal Ca2+ levels, elevated ER Ca2+ stores, and reduced Ca2+ clearance. PMCA4 KO B cells showed normal Ca2+ handling and normal B-cell development. Human and mouse naïve B cells express only PMCA1 (not PMCA4), in contrast to T cells. This demonstrates that PMCA1 is the sole isoform required for B-cell Ca2+ signaling and development.","method":"B-cell conditional KO mice (Cre-loxP); FACS analysis of B-cell populations; western blot for PMCA1/4; Ca2+ measurement in B cells","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with specific immunological phenotype, isoform-specific western blot, Ca2+ functional assay, and comparison with PMCA4 KO as control","pmids":["33098669"],"is_preprint":false},{"year":2022,"finding":"Nine de novo missense variants of ATP2B1, when introduced into HEK293T cells, all lead to significantly decreased Ca2+ export capacity compared to wild-type, as measured by Ca2+ imaging. The same variant set also causes incorrect intracellular localization of ATP2B1 (mislocalization away from plasma membrane). 3D structural modeling predicted destabilizing effects of the variants on the protein.","method":"Ca2+ imaging in transfected HEK293T cells; confocal microscopy for subcellular localization; 3D structural protein modeling","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional Ca2+ export assay and localization imaging across 9 independent variants in transfected cells, multiple orthogonal methods in single study","pmids":["35358416"],"is_preprint":false},{"year":2022,"finding":"In stretched myoblasts, calreticulin (CRT) inhibits PMCA1 activity via suppressing calmodulin (CaM), while reduced PMCA1 activity promotes CRT expression through the p38MAPK pathway, forming a positive feedback loop (CRT-CaM-PMCA1-p38MAPK-CRT) that causes Ca2+ overload and apoptosis. PMCA1 overexpression attenuated stretch-induced Ca2+ accumulation and apoptosis; PMCA1 knockdown aggravated them.","method":"Mechanical stretch of myoblasts; CRT knockdown/overexpression; PMCA1 knockdown/overexpression; p38MAPK inhibitor; CaM inhibitor; intracellular Ca2+ measurement; apoptosis assay","journal":"Apoptosis : an international journal on programmed cell death","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple gain/loss-of-function experiments with pharmacological inhibitors establishing a pathway loop, single lab","pmids":["35976579"],"is_preprint":false},{"year":2023,"finding":"Biallelic ATP2B1 variants (compound heterozygous: splice-site causing NMD + missense p.Val980Leu) cause a neurodevelopmental malformation syndrome with primary hypoparathyroidism. The correctly-spliced mRNA encoding p.Val980Leu caused decreased cellular Ca2+ extrusion in functional assays, and immunoblotting showed reduced fibroblast ATP2B1 protein.","method":"Trio exome sequencing; RT-PCR on fibroblast mRNA showing aberrant splicing and NMD; Ca2+ extrusion functional assay; immunoblotting for ATP2B1","journal":"European journal of human genetics : EJHG","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional Ca2+ extrusion assay and protein quantification in patient fibroblasts plus molecular splicing analysis, single case","pmids":["37926713"],"is_preprint":false},{"year":2024,"finding":"A caloxin-derivative compound (PI-7) targeting ATP2B1 reduces intracellular Ca2+ levels and impairs SARS-CoV-2 infection and replication. During SARS-CoV-2 infection, PI3K/Akt signaling is activated, leading to FOXO3 inactivation and transcriptional downregulation of ATP2B1 (and ATP2A1), increasing intracellular Ca2+. Pharmacological maintenance of ATP2B1 expression by PI-7 reduces the intracellular Ca2+ pool and negatively influences SARS-CoV-2 replication.","method":"Pharmacological inhibition with caloxin-derivative PI-7; intracellular Ca2+ measurement; SARS-CoV-2 infection assay; PI3K/Akt/FOXO3 pathway analysis; ATP2B1 expression measurement","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological targeting with defined pathway (PI3K/Akt/FOXO3/ATP2B1) and functional viral replication readout, single lab","pmids":["38816514"],"is_preprint":false},{"year":2024,"finding":"CD4+ T cell-specific knockout of ATP2B1 in mice causes colitis with diarrhea, colonic wall thickening, crypt distortion, and shorter colon, accompanied by increased T-bet (Th1 marker) and GATA3 (Th2 marker) expression in blood CD4+ T cells, and increased TNF-α and gp91 in colon. This demonstrates that ATP2B1-mediated Ca2+ removal from CD4+ T cells is required to prevent T cell hyperactivation and colitis.","method":"CD4+ T cell-specific Cre-loxP KO mice; FACS analysis of T-cell populations; qRT-PCR for T-bet, GATA3, TNF-α, gp91; colon histology","journal":"Inflammatory bowel diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined immunological and histological phenotype, single lab","pmids":["38507609"],"is_preprint":false},{"year":2025,"finding":"ATP2B1 (PMCA1) was identified as a proximity interactor of Frizzled4 (FZD4) in endothelial cells by proximity biotinylation. ATP2B1 depletion increased endothelial cell Ca2+ and significantly attenuated Norrin/Frizzled4-induced β-catenin signaling. These effects were recapitulated by ionomycin-mediated Ca2+ elevation and suppressed by calcineurin/NFAT inhibition. Endothelial-specific Atp2b1 deletion caused retinal vascular defects consistent with compromised Norrin/FZD4 signaling. In developing brain, WNT7A/B pathway loss-of-function phenotypes in Gpr124 KO mice were exacerbated by additional endothelial Atp2b1 deletion.","method":"Proximity biotinylation (BioID); endothelial conditional KO; retinal vascular phenotyping; β-catenin signaling assay; ionomycin and calcineurin/NFAT inhibitor pharmacology; genetic epistasis with Gpr124 KO","journal":"bioRxiv : the preprint server for biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proximity biotinylation identification, functional KO phenotype, and genetic epistasis, single lab, preprint","pmids":["40777252"],"is_preprint":true},{"year":2026,"finding":"ATP2B1+ (PMCA1-expressing) CD49f+ LT-HSCs exhibit superior long-term repopulation and self-renewal capacities in vivo compared to ATP2B1- LT-HSCs, as assessed in xenograft assays. ATP2B1+ LT-HSCs show enrichment for a self-renewal program including the TFEB-endolysosomal axis by scMultiome and immunofluorescence.","method":"Immunophenotypic sorting by ATP2B1 cell-surface expression; single-cell clonogenic assays; in vivo xenograft repopulation assay; scMultiome molecular profiling; immunofluorescence microscopy","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo xenograft repopulation assay and scMultiome molecular profiling, single lab, multiple orthogonal methods","pmids":["42085155"],"is_preprint":false},{"year":2026,"finding":"A novel de novo ATP2B1 missense variant (p.Thr714Pro) causes profound cytoplasmic mislocalization of the PMCA1 protein (as shown by confocal imaging of mScarlet-tagged constructs in HEK293T cells) and a 2.07-fold increase in basal intracellular Ca2+ levels (measured by Fluo-4 AM), confirming that impaired plasma membrane trafficking and calcium dyshomeostasis are the core pathomechanisms of ATP2B1-associated neurodevelopmental disorder.","method":"Confocal imaging of mScarlet-tagged WT and mutant ATP2B1 in transfected HEK293T cells; Fluo-4 AM intracellular Ca2+ measurement; whole-exome sequencing","journal":"Experimental biology and medicine (Maywood, N.J.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional localization and Ca2+ assay in transfected cells for a single variant, single lab","pmids":["41853798"],"is_preprint":false}],"current_model":"ATP2B1/PMCA1 is a plasma membrane Ca2+-ATPase that extrudes Ca2+ from cells to maintain intracellular calcium homeostasis; it is essential for embryonic development, and tissue-specific loss in vascular smooth muscle cells, intestinal epithelium, B cells, or CD4+ T cells causes elevated blood pressure (via impaired eNOS/NO signaling and increased L-type Ca2+ channel activity), defective intestinal calcium absorption with reduced bone mineral density and impaired vitamin D responsiveness, abrogated B-cell development with elevated basal Ca2+, and T cell hyperactivation with colitis, respectively; at the molecular level its activity is inhibited by 14-3-3epsilon binding, its basolateral targeting in hair cells is dictated by a Leu-Ile motif in the 'b' C-terminal splice variant, its promoter is subject to tissue-specific transcriptional downregulation by 1,25-dihydroxyvitamin D3, de novo missense variants cause decreased Ca2+ export and plasma membrane mislocalization leading to neurodevelopmental disorder, and it facilitates Norrin/WNT7-FZD4/β-catenin signaling in endothelial cells by keeping intracellular Ca2+ low and thereby suppressing calcineurin/NFAT."},"narrative":{"mechanistic_narrative":"ATP2B1 (PMCA1) is a plasma membrane Ca2+-ATPase that extrudes cytosolic Ca2+ to maintain intracellular calcium homeostasis, a function essential for embryonic development since homozygous knockout is embryolethal in mice [PMID:15178683]. Across multiple cell types its Ca2+-clearing activity sets the basal calcium tone that downstream effectors require: tissue-specific deletion in vascular smooth muscle elevates intracellular Ca2+ and blood pressure with upregulated L-type Ca2+ channels [PMID:22311909, PMID:29046519], deletion in intestinal epithelium abolishes active calcium absorption and vitamin D-responsive calcium handling [PMID:26392310], deletion in B cells raises basal and ER Ca2+ and abrogates B-cell development [PMID:33098669], and deletion in CD4+ T cells drives T-cell hyperactivation and colitis [PMID:38507609]. By keeping cytosolic Ca2+ low, ATP2B1 gates calcium/calmodulin-dependent signaling — its loss in endothelial cells alters eNOS activity and NO production [PMID:24805951, PMID:29416109] and feeds the calmodulin/eNOS/Akt insulin-sensitivity axis [PMID:29104511] — and supports Norrin/WNT7-FZD4/β-catenin signaling by suppressing calcineurin/NFAT [PMID:40777252]. Its pump activity is inhibited by phosphorylation-independent binding of 14-3-3epsilon [PMID:18029012] and by a calreticulin–calmodulin–p38MAPK feedback loop under mechanical stress [PMID:35976579], and basolateral targeting in hair cells is directed by a Leu-Ile motif in the 'b'-tail splice variant [PMID:16803870]. De novo and biallelic missense variants reduce Ca2+ export and mislocalize the protein away from the plasma membrane, causing a neurodevelopmental disorder, in one case with primary hypoparathyroidism [PMID:35358416, PMID:37926713, PMID:41853798].","teleology":[{"year":2004,"claim":"Established that PMCA1 is not redundant with other PMCA isoforms but performs an essential, non-substitutable developmental function.","evidence":"Targeted null knockout in mice scored for embryonic lethality","pmids":["15178683"],"confidence":"High","gaps":["Does not identify which developmental process or cell lineage requires PMCA1","Heterozygotes appear normal, leaving dose-sensitivity in adults unaddressed"]},{"year":2000,"claim":"Addressed how PMCA1 expression is hormonally controlled, showing tissue-specific transcriptional downregulation of its promoter by 1,25-dihydroxyvitamin D3.","evidence":"Luciferase reporter assays with promoter deletions plus EMSA in osteosarcoma vs. kidney cell lines","pmids":["11062020"],"confidence":"Medium","gaps":["Candidate VDRE did not bind VDR/RXRalpha, so the responsible element is unmapped","Mechanism of tissue specificity not resolved"]},{"year":2006,"claim":"Defined how PMCA1 achieves correct polarized targeting, identifying a Leu-Ile motif in the 'b'-tail splice variant that drives basolateral sorting.","evidence":"Splice-variant localization and motif dissection in mammalian hair cells","pmids":["16803870"],"confidence":"Medium","gaps":["Trafficking machinery recognizing the motif not identified","Generality beyond hair cells untested"]},{"year":2007,"claim":"Identified a direct protein regulator of PMCA1, showing 14-3-3epsilon binds and inhibits its Ca2+-pumping activity independent of phosphorylation.","evidence":"Reciprocal Co-IP and GST pulldown plus aequorin Ca2+ assay in HeLa/CHO cells","pmids":["18029012"],"confidence":"Medium","gaps":["Binding site on PMCA1 not mapped","Physiological context of the inhibition in vivo unknown"]},{"year":2012,"claim":"Causally linked ATP2B1 to blood pressure, showing VSMC-specific loss raises intracellular Ca2+, vasoconstriction, and blood pressure.","evidence":"VSMC conditional KO with telemetric BP, Ca2+ measurement, and vascular ring assays","pmids":["22311909"],"confidence":"High","gaps":["Did not distinguish whether elevated Ca2+ acts via channels or compensatory transporter changes","Endothelial contribution not separated"]},{"year":2017,"claim":"Placed L-type Ca2+ channel upregulation downstream of VSMC ATP2B1 loss as the primary hypertensive mechanism.","evidence":"VSMC KO with pharmacological dissection (CCB vs ARB vs alpha-blocker) and channel expression analysis","pmids":["29046519"],"confidence":"Medium","gaps":["Mechanism coupling reduced pump activity to channel upregulation unknown","nNOS unchanged, leaving endothelial axis unaddressed here"]},{"year":2014,"claim":"Connected ATP2B1 to endothelial NO signaling, showing haploinsufficiency reduces eNOS Ser-1177 phosphorylation and NO production.","evidence":"Heterozygous KO mice with vascular relaxation assays, eNOS western blot, and NO measurement","pmids":["24805951"],"confidence":"High","gaps":["Direction of Ca2+ effect on eNOS not reconciled with later HUVEC data","Endothelial vs smooth muscle contributions to BP not separated"]},{"year":2017,"claim":"Mapped the endothelial Ca2+/calmodulin/eNOS/Akt pathway controlled by ATP2B1, where silencing raises Ca2+ and increases eNOS activity and insulin-induced Akt signaling.","evidence":"siRNA knockdown in HUVECs with BAPTA-AM, W7, and L-NAME epistasis and Ca2+/NO/Akt readouts","pmids":["29416109","29104511"],"confidence":"Medium","gaps":["Cell-culture results show increased eNOS activity, opposite to the in vivo haploinsufficiency phenotype","In vivo relevance of the insulin-sensitivity arm not tested"]},{"year":2015,"claim":"Established ATP2B1 as the intestinal calcium-extrusion step required for active, vitamin D-responsive calcium absorption and bone mineralization.","evidence":"Villin-Cre intestinal KO with active Ca2+ transport, DXA, and hormone measurements","pmids":["26392310"],"confidence":"High","gaps":["Does not explain how vitamin D normally upregulates the pump given promoter repression data","Renal contribution not addressed"]},{"year":2018,"claim":"Extended ATP2B1's role to systemic calcium homeostasis, linking haploinsufficiency to hypocalcemia, hypercalciuria, and altered PTH.","evidence":"Heterozygous KO mice with serum/urinary calcium, PTH, BMD, and tissue expression measurement","pmids":["29950683"],"confidence":"Medium","gaps":["Direct role in parathyroid PTH secretion vs secondary effect not resolved","Increased BMD here contrasts with reduced BMD in intestinal KO"]},{"year":2017,"claim":"Showed ATP2B1 loss drives arterial structural remodeling that precedes age-dependent hypertension.","evidence":"Longitudinal BP and pressure myography in heterozygous KO mice across ages","pmids":["28795531"],"confidence":"Medium","gaps":["Causal chain from Ca2+ elevation to remodeling not defined","Cell type responsible for remodeling not isolated"]},{"year":2020,"claim":"Identified PMCA1 as the sole PMCA isoform required for B-cell Ca2+ handling and development, distinguishing it from PMCA4.","evidence":"B-cell conditional KO with FACS, isoform-specific western blot, Ca2+ assays, and PMCA4 KO comparison","pmids":["33098669"],"confidence":"High","gaps":["Stage at which Ca2+ overload blocks development not pinpointed","Downstream Ca2+-sensitive effectors in B cells not identified"]},{"year":2024,"claim":"Extended the immune role to T cells, showing CD4+ T-cell ATP2B1 loss causes hyperactivation and colitis.","evidence":"CD4+ T-cell conditional KO with T-cell FACS, cytokine qRT-PCR, and colon histology","pmids":["38507609"],"confidence":"Medium","gaps":["Ca2+ measurements in the KO T cells not reported in this entry","Whether colitis is T-cell-intrinsic vs microbiome-dependent untested"]},{"year":2022,"claim":"Defined a stress-responsive inhibitory loop in which calreticulin suppresses PMCA1 via calmodulin and a p38MAPK feedback arm, linking pump inhibition to Ca2+ overload and apoptosis.","evidence":"Mechanical stretch of myoblasts with CRT/PMCA1 gain/loss-of-function and pathway inhibitors","pmids":["35976579"],"confidence":"Medium","gaps":["Whether CRT acts directly or via CaM on the pump not biochemically resolved","Relevance beyond stretched myoblasts unknown"]},{"year":2022,"claim":"Established de novo ATP2B1 missense variants as a cause of neurodevelopmental disorder through reduced Ca2+ export and plasma-membrane mislocalization.","evidence":"Ca2+ imaging, confocal localization, and structural modeling of nine variants in HEK293T cells","pmids":["35358416"],"confidence":"High","gaps":["Neuronal cell-type consequences not modeled","Genotype-phenotype correlation across variants not established"]},{"year":2023,"claim":"Demonstrated a biallelic loss-of-function presentation combining neurodevelopmental malformation with primary hypoparathyroidism.","evidence":"Trio exome sequencing with fibroblast splicing analysis, Ca2+ extrusion assay, and immunoblotting","pmids":["37926713"],"confidence":"Medium","gaps":["Single case limits genotype-phenotype generalization","Mechanism of hypoparathyroidism in this patient not dissected"]},{"year":2026,"claim":"Confirmed impaired trafficking and calcium dyshomeostasis as the core pathomechanism with an additional de novo variant.","evidence":"Confocal imaging of tagged constructs and Fluo-4 Ca2+ measurement in HEK293T cells","pmids":["41853798"],"confidence":"Medium","gaps":["Single variant in heterologous cells","Mechanism of retention/mislocalization not defined"]},{"year":2024,"claim":"Revealed an antiviral angle, showing SARS-CoV-2 downregulates ATP2B1 via PI3K/Akt/FOXO3 and that maintaining the pump pharmacologically limits viral replication.","evidence":"Caloxin-derivative PI-7 treatment, Ca2+ measurement, infection assays, and pathway analysis","pmids":["38816514"],"confidence":"Medium","gaps":["How intracellular Ca2+ supports viral replication mechanistically unclear","PI-7 specificity for ATP2B1 not fully delineated"]},{"year":2025,"claim":"Connected ATP2B1 to developmental angiogenic signaling, identifying it as an FZD4 proximity partner whose Ca2+-lowering activity sustains Norrin/WNT7-FZD4/β-catenin signaling by restraining calcineurin/NFAT.","evidence":"BioID, endothelial conditional KO with retinal phenotyping, β-catenin assays, ionomycin/calcineurin pharmacology, and Gpr124 epistasis (preprint)","pmids":["40777252"],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Direct vs indirect FZD4 association not biochemically resolved"]},{"year":2026,"claim":"Linked ATP2B1 surface expression to hematopoietic stem cell function, marking LT-HSCs with superior self-renewal and a TFEB-endolysosomal program.","evidence":"Surface sorting, in vivo xenograft repopulation, scMultiome, and immunofluorescence","pmids":["42085155"],"confidence":"Medium","gaps":["Whether ATP2B1 is functionally required or merely a marker not established","Mechanistic link between Ca2+ extrusion and the TFEB axis untested"]},{"year":null,"claim":"It remains unresolved how reduced ATP2B1 Ca2+-pump activity produces opposite eNOS/NO outcomes between cultured endothelial cells and intact vessels, and how a single Ca2+-extrusion defect is translated into the divergent tissue phenotypes (hypertension, calcium malabsorption, immune dysregulation, neurodevelopmental disease) by distinct downstream Ca2+ effectors.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model reconciling cell-autonomous Ca2+ rise with tissue-specific signaling outputs","Direct structural basis of variant-induced mislocalization not solved","Endothelial vs smooth-muscle contributions to NO/blood-pressure phenotype not cleanly separated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140657","term_label":"ATP-dependent activity","supporting_discovery_ids":[0,4,14]},{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[4,7,13,14]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[14,16]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[1,14,21]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[14,21]}],"pathway":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[4,7,13]}],"complexes":[],"partners":["YWHAE","FZD4","CALR"],"other_free_text":[]}},"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 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Heterozygous knockout shows no overt phenotype. PMCA1 is distinct from PMCA4 in this essential role.\",\n      \"method\": \"Targeted gene knockout (null mutation) in mice; embryonic lethality readout\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined developmental phenotype, replicated across multiple genetic backgrounds, published in peer-reviewed journal\",\n      \"pmids\": [\"15178683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A Leu-Ile motif in 'b'-tail splice variants of PMCA1 promotes basolateral sorting in hair cells, whereas apical targeting of PMCA2 depends on the size of the A-site-spliced insert. PMCA1 is localized to the basolateral plasma membrane of hair cells, while PMCA2 is localized to stereocilia.\",\n      \"method\": \"Subcellular localization studies and molecular dissection of targeting motifs in mammalian hair cells; splice-variant expression analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization experiment with functional domain dissection, single lab, multiple splice variants tested\",\n      \"pmids\": [\"16803870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"14-3-3epsilon protein interacts with PMCA1 (and PMCA3) and inhibits their Ca2+-pumping activity. The interaction is phosphorylation-independent and was confirmed by co-immunoprecipitation in HeLa cells and GST-pulldown with fusion proteins. Co-expression of 14-3-3epsilon with PMCA1 in CHO cells decreased the ability of cells to restore basal Ca2+ concentration after an InsP3-induced Ca2+ transient.\",\n      \"method\": \"Co-immunoprecipitation in HeLa cells; GST pulldown with fusion proteins; aequorin-based Ca2+ measurement in CHO cells co-expressing 14-3-3epsilon and PMCA1\",\n      \"journal\": \"Cell calcium\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and pulldown plus functional Ca2+ assay, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"18029012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The 1.7-kb promoter region of the human PMCA1 gene mediates transcriptional downregulation by 1,25-dihydroxyvitamin D3 in ROS 17/2.8 osteosarcoma cells but not MDBK cells, demonstrating tissue-specific sensitivity. EMSA analysis showed that a candidate VDRE sequence in the PMCA1 promoter did not interact with VDR or RXRalpha, suggesting any positive regulatory VDRE lies outside the 1.7-kb core promoter.\",\n      \"method\": \"Luciferase reporter gene assays with promoter deletion constructs; EMSA with nuclear extracts from COS-1 cells expressing hVDR and hRXRalpha\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with multiple deletion constructs plus EMSA, single lab, two orthogonal methods\",\n      \"pmids\": [\"11062020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Vascular smooth muscle cell (VSMC)-specific knockout of ATP2B1 in mice causes significantly elevated blood pressure (measured by tail-cuff and radiotelemetry), increased intracellular calcium concentration in VSMCs under basal and phenylephrine-stimulated conditions, and increased phenylephrine-induced vasoconstriction. Na+-Ca2+ exchanger isoform 1 expression was decreased and ATP2B4 expression was increased in KO VSMCs.\",\n      \"method\": \"Cre-loxP conditional knockout in VSMCs; radiotelemetry and tail-cuff blood pressure measurement; intracellular calcium measurement in cultured VSMCs; vascular ring contraction assays\",\n      \"journal\": \"Hypertension (Dallas, Tex. : 1979)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined cellular phenotype (elevated Ca2+, increased vasoconstriction, elevated BP), multiple orthogonal readouts, peer-reviewed\",\n      \"pmids\": [\"22311909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Systemic siRNA-mediated silencing of Atp2b1 in mice via tail vein injection elevated blood pressure, increased mesenteric artery wall:lumen ratio, enhanced myogenic responses to pressure, and increased contractile responses to phenylephrine, demonstrating that ATP2B1 regulates blood pressure through control of vascular calcium and contractility.\",\n      \"method\": \"In vivo siRNA knockdown via tail vein injection; blood pressure measurement; vascular morphometry; myogenic and contractile response assays\",\n      \"journal\": \"Journal of hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KD with defined vascular phenotype, single lab, multiple readouts\",\n      \"pmids\": [\"23666421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Systemic heterozygous ATP2B1 null mice exhibit elevated blood pressure, increased phenylephrine-induced vasoconstriction (abolished by NOS inhibitor), attenuated acetylcholine-induced vasorelaxation, reduced phosphorylation of eNOS at Ser-1177, and decreased nitric oxide production in endothelial cells and aorta. Neural NOS expression in VSMCs was not significantly different. This demonstrates that ATP2B1 haploinsufficiency impairs endothelial NOS activity and NO production.\",\n      \"method\": \"Heterozygous KO mice; radiotelemetric BP measurement; vascular ring contraction/relaxation assays with NOS inhibitor; eNOS phosphorylation by western blot; NO measurement in cultured endothelial cells and aorta\",\n      \"journal\": \"Journal of hypertension\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — heterozygous KO with multiple orthogonal phenotypic and molecular readouts (eNOS phosphorylation, NO production, vascular function), peer-reviewed\",\n      \"pmids\": [\"24805951\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Intestinal epithelial cell-specific knockout of Pmca1 (Atp2b1) in mice results in reduced bone mineral density, impaired active intestinal calcium transport, and failure to upregulate calcium absorption in response to 1,25-dihydroxyvitamin D3, demonstrating that intestinal PMCA1 is required for active calcium absorption and vitamin D-responsive calcium homeostasis.\",\n      \"method\": \"Villin-Cre intestinal conditional knockout; bone mineral density by DXA; active intestinal calcium transport assay; PTH and 1,25(OH)2D3 measurements; urinary phosphorus measurement\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with specific physiological readouts (bone mineral density, active Ca2+ transport, vitamin D responsiveness), multiple orthogonal measurements\",\n      \"pmids\": [\"26392310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"VSMC-specific ATP2B1 KO mice show enhanced blood pressure reduction with a single injection of nicardipine (L-type Ca2+ channel blocker) compared to ARB or alpha-blocker, and L-type calcium channel mRNA and protein are upregulated in KO VSMCs. Long-term amlodipine (CCB) but not ARB significantly decreased BP in KO vs. control mice. Neural NOS expression and urinary NO production were unchanged. This places ATP2B1 upstream of L-type Ca2+ channel upregulation as the primary mechanism of hypertension in these mice.\",\n      \"method\": \"VSMC conditional KO mice; drug treatment with CCB, ARB, alpha-blocker; radiotelemetric BP measurement; quantitative RT-PCR and western blot for L-type Ca2+ channel and nNOS\",\n      \"journal\": \"Hypertension research : official journal of the Japanese Society of Hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with pharmacological dissection and molecular readout, single lab, multiple methods\",\n      \"pmids\": [\"29046519\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ATP2B1 gene silencing in HUVECs elevates intracellular Ca2+ concentration, increases eNOS activity and NO production under basal conditions via the Ca2+/calmodulin pathway, as confirmed by BAPTA-AM (calcium chelator) and W7 (calmodulin antagonist) abolishing the effect.\",\n      \"method\": \"siRNA knockdown in HUVECs; intracellular Ca2+ measurement; NO and eNOS activity assays; pharmacological inhibition with BAPTA-AM, W7\",\n      \"journal\": \"Hypertension research : official journal of the Japanese Society of Hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with pharmacological pathway dissection using two inhibitors, single lab\",\n      \"pmids\": [\"29416109\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ATP2B1 gene silencing in HUVECs elevates intracellular Ca2+ and increases insulin-induced Akt activation (insulin sensitivity) via the Ca2+/calmodulin/eNOS/Akt signaling pathway. The enhanced insulin sensitivity was abolished by BAPTA-AM, W7 (calmodulin antagonist), and L-NAME (eNOS inhibitor), demonstrating the pathway: elevated Ca2+ → calmodulin → eNOS → Akt.\",\n      \"method\": \"siRNA knockdown in HUVECs; insulin-stimulated Akt phosphorylation by western blot; pharmacological inhibition with BAPTA-AM, W7, L-NAME; intracellular Ca2+ measurement\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA KD with epistasis established by three orthogonal pharmacological inhibitors, single lab\",\n      \"pmids\": [\"29104511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Heterozygous PMCA1 null mice develop elevated blood pressure at ≥12 months of age (not at 6 or 9 months), preceded by eutrophic remodelling of small mesenteric arteries (decreased lumen diameter, increased wall thickness) and increased mesenteric artery intrinsic tone and global intracellular calcium at both 6 and 18 months. Structural arterial changes precede the BP elevation.\",\n      \"method\": \"Heterozygous PMCA1 KO mice; conscious BP measurement at multiple ages; pressure myography of mesenteric arteries; intracellular Ca2+ measurement\",\n      \"journal\": \"Aging cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse model with longitudinal BP measurement and vascular functional phenotyping, single lab\",\n      \"pmids\": [\"28795531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Systemic heterozygous ATP2B1+/- mice exhibit hypocalcemia, reduced renal and intestinal ATP2B1 expression, hypercalciuria, lower intact-PTH levels, and increased bone mineral density. This demonstrates that ATP2B1 is required not only for intracellular Ca2+ regulation but also for systemic calcium homeostasis and PTH secretion.\",\n      \"method\": \"Heterozygous KO mice; serum and urinary calcium/PTH measurement; bone mineral density measurement; RT-PCR for tissue ATP2B1 expression\",\n      \"journal\": \"Hypertension research : official journal of the Japanese Society of Hypertension\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with multiple systemic calcium homeostasis readouts, single lab\",\n      \"pmids\": [\"29950683\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Conditional knockout of Pmca1 (Atp2b1) in B cells results in greatly reduced numbers of splenic follicular B cells, marginal zone B cells, and peritoneal B-1a cells, elevated basal Ca2+ levels, elevated ER Ca2+ stores, and reduced Ca2+ clearance. PMCA4 KO B cells showed normal Ca2+ handling and normal B-cell development. Human and mouse naïve B cells express only PMCA1 (not PMCA4), in contrast to T cells. This demonstrates that PMCA1 is the sole isoform required for B-cell Ca2+ signaling and development.\",\n      \"method\": \"B-cell conditional KO mice (Cre-loxP); FACS analysis of B-cell populations; western blot for PMCA1/4; Ca2+ measurement in B cells\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with specific immunological phenotype, isoform-specific western blot, Ca2+ functional assay, and comparison with PMCA4 KO as control\",\n      \"pmids\": [\"33098669\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Nine de novo missense variants of ATP2B1, when introduced into HEK293T cells, all lead to significantly decreased Ca2+ export capacity compared to wild-type, as measured by Ca2+ imaging. The same variant set also causes incorrect intracellular localization of ATP2B1 (mislocalization away from plasma membrane). 3D structural modeling predicted destabilizing effects of the variants on the protein.\",\n      \"method\": \"Ca2+ imaging in transfected HEK293T cells; confocal microscopy for subcellular localization; 3D structural protein modeling\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional Ca2+ export assay and localization imaging across 9 independent variants in transfected cells, multiple orthogonal methods in single study\",\n      \"pmids\": [\"35358416\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In stretched myoblasts, calreticulin (CRT) inhibits PMCA1 activity via suppressing calmodulin (CaM), while reduced PMCA1 activity promotes CRT expression through the p38MAPK pathway, forming a positive feedback loop (CRT-CaM-PMCA1-p38MAPK-CRT) that causes Ca2+ overload and apoptosis. PMCA1 overexpression attenuated stretch-induced Ca2+ accumulation and apoptosis; PMCA1 knockdown aggravated them.\",\n      \"method\": \"Mechanical stretch of myoblasts; CRT knockdown/overexpression; PMCA1 knockdown/overexpression; p38MAPK inhibitor; CaM inhibitor; intracellular Ca2+ measurement; apoptosis assay\",\n      \"journal\": \"Apoptosis : an international journal on programmed cell death\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple gain/loss-of-function experiments with pharmacological inhibitors establishing a pathway loop, single lab\",\n      \"pmids\": [\"35976579\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Biallelic ATP2B1 variants (compound heterozygous: splice-site causing NMD + missense p.Val980Leu) cause a neurodevelopmental malformation syndrome with primary hypoparathyroidism. The correctly-spliced mRNA encoding p.Val980Leu caused decreased cellular Ca2+ extrusion in functional assays, and immunoblotting showed reduced fibroblast ATP2B1 protein.\",\n      \"method\": \"Trio exome sequencing; RT-PCR on fibroblast mRNA showing aberrant splicing and NMD; Ca2+ extrusion functional assay; immunoblotting for ATP2B1\",\n      \"journal\": \"European journal of human genetics : EJHG\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional Ca2+ extrusion assay and protein quantification in patient fibroblasts plus molecular splicing analysis, single case\",\n      \"pmids\": [\"37926713\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"A caloxin-derivative compound (PI-7) targeting ATP2B1 reduces intracellular Ca2+ levels and impairs SARS-CoV-2 infection and replication. During SARS-CoV-2 infection, PI3K/Akt signaling is activated, leading to FOXO3 inactivation and transcriptional downregulation of ATP2B1 (and ATP2A1), increasing intracellular Ca2+. Pharmacological maintenance of ATP2B1 expression by PI-7 reduces the intracellular Ca2+ pool and negatively influences SARS-CoV-2 replication.\",\n      \"method\": \"Pharmacological inhibition with caloxin-derivative PI-7; intracellular Ca2+ measurement; SARS-CoV-2 infection assay; PI3K/Akt/FOXO3 pathway analysis; ATP2B1 expression measurement\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological targeting with defined pathway (PI3K/Akt/FOXO3/ATP2B1) and functional viral replication readout, single lab\",\n      \"pmids\": [\"38816514\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"CD4+ T cell-specific knockout of ATP2B1 in mice causes colitis with diarrhea, colonic wall thickening, crypt distortion, and shorter colon, accompanied by increased T-bet (Th1 marker) and GATA3 (Th2 marker) expression in blood CD4+ T cells, and increased TNF-α and gp91 in colon. This demonstrates that ATP2B1-mediated Ca2+ removal from CD4+ T cells is required to prevent T cell hyperactivation and colitis.\",\n      \"method\": \"CD4+ T cell-specific Cre-loxP KO mice; FACS analysis of T-cell populations; qRT-PCR for T-bet, GATA3, TNF-α, gp91; colon histology\",\n      \"journal\": \"Inflammatory bowel diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined immunological and histological phenotype, single lab\",\n      \"pmids\": [\"38507609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ATP2B1 (PMCA1) was identified as a proximity interactor of Frizzled4 (FZD4) in endothelial cells by proximity biotinylation. ATP2B1 depletion increased endothelial cell Ca2+ and significantly attenuated Norrin/Frizzled4-induced β-catenin signaling. These effects were recapitulated by ionomycin-mediated Ca2+ elevation and suppressed by calcineurin/NFAT inhibition. Endothelial-specific Atp2b1 deletion caused retinal vascular defects consistent with compromised Norrin/FZD4 signaling. In developing brain, WNT7A/B pathway loss-of-function phenotypes in Gpr124 KO mice were exacerbated by additional endothelial Atp2b1 deletion.\",\n      \"method\": \"Proximity biotinylation (BioID); endothelial conditional KO; retinal vascular phenotyping; β-catenin signaling assay; ionomycin and calcineurin/NFAT inhibitor pharmacology; genetic epistasis with Gpr124 KO\",\n      \"journal\": \"bioRxiv : the preprint server for biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proximity biotinylation identification, functional KO phenotype, and genetic epistasis, single lab, preprint\",\n      \"pmids\": [\"40777252\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ATP2B1+ (PMCA1-expressing) CD49f+ LT-HSCs exhibit superior long-term repopulation and self-renewal capacities in vivo compared to ATP2B1- LT-HSCs, as assessed in xenograft assays. ATP2B1+ LT-HSCs show enrichment for a self-renewal program including the TFEB-endolysosomal axis by scMultiome and immunofluorescence.\",\n      \"method\": \"Immunophenotypic sorting by ATP2B1 cell-surface expression; single-cell clonogenic assays; in vivo xenograft repopulation assay; scMultiome molecular profiling; immunofluorescence microscopy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo xenograft repopulation assay and scMultiome molecular profiling, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"42085155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"A novel de novo ATP2B1 missense variant (p.Thr714Pro) causes profound cytoplasmic mislocalization of the PMCA1 protein (as shown by confocal imaging of mScarlet-tagged constructs in HEK293T cells) and a 2.07-fold increase in basal intracellular Ca2+ levels (measured by Fluo-4 AM), confirming that impaired plasma membrane trafficking and calcium dyshomeostasis are the core pathomechanisms of ATP2B1-associated neurodevelopmental disorder.\",\n      \"method\": \"Confocal imaging of mScarlet-tagged WT and mutant ATP2B1 in transfected HEK293T cells; Fluo-4 AM intracellular Ca2+ measurement; whole-exome sequencing\",\n      \"journal\": \"Experimental biology and medicine (Maywood, N.J.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional localization and Ca2+ assay in transfected cells for a single variant, single lab\",\n      \"pmids\": [\"41853798\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ATP2B1/PMCA1 is a plasma membrane Ca2+-ATPase that extrudes Ca2+ from cells to maintain intracellular calcium homeostasis; it is essential for embryonic development, and tissue-specific loss in vascular smooth muscle cells, intestinal epithelium, B cells, or CD4+ T cells causes elevated blood pressure (via impaired eNOS/NO signaling and increased L-type Ca2+ channel activity), defective intestinal calcium absorption with reduced bone mineral density and impaired vitamin D responsiveness, abrogated B-cell development with elevated basal Ca2+, and T cell hyperactivation with colitis, respectively; at the molecular level its activity is inhibited by 14-3-3epsilon binding, its basolateral targeting in hair cells is dictated by a Leu-Ile motif in the 'b' C-terminal splice variant, its promoter is subject to tissue-specific transcriptional downregulation by 1,25-dihydroxyvitamin D3, de novo missense variants cause decreased Ca2+ export and plasma membrane mislocalization leading to neurodevelopmental disorder, and it facilitates Norrin/WNT7-FZD4/β-catenin signaling in endothelial cells by keeping intracellular Ca2+ low and thereby suppressing calcineurin/NFAT.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ATP2B1 (PMCA1) is a plasma membrane Ca2+-ATPase that extrudes cytosolic Ca2+ to maintain intracellular calcium homeostasis, a function essential for embryonic development since homozygous knockout is embryolethal in mice [#0]. Across multiple cell types its Ca2+-clearing activity sets the basal calcium tone that downstream effectors require: tissue-specific deletion in vascular smooth muscle elevates intracellular Ca2+ and blood pressure with upregulated L-type Ca2+ channels [#4, #8], deletion in intestinal epithelium abolishes active calcium absorption and vitamin D-responsive calcium handling [#7], deletion in B cells raises basal and ER Ca2+ and abrogates B-cell development [#13], and deletion in CD4+ T cells drives T-cell hyperactivation and colitis [#18]. By keeping cytosolic Ca2+ low, ATP2B1 gates calcium/calmodulin-dependent signaling — its loss in endothelial cells alters eNOS activity and NO production [#6, #9] and feeds the calmodulin/eNOS/Akt insulin-sensitivity axis [#10] — and supports Norrin/WNT7-FZD4/\\u03b2-catenin signaling by suppressing calcineurin/NFAT [#19]. Its pump activity is inhibited by phosphorylation-independent binding of 14-3-3epsilon [#2] and by a calreticulin\\u2013calmodulin\\u2013p38MAPK feedback loop under mechanical stress [#15], and basolateral targeting in hair cells is directed by a Leu-Ile motif in the 'b'-tail splice variant [#1]. De novo and biallelic missense variants reduce Ca2+ export and mislocalize the protein away from the plasma membrane, causing a neurodevelopmental disorder, in one case with primary hypoparathyroidism [#14, #16, #21].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established that PMCA1 is not redundant with other PMCA isoforms but performs an essential, non-substitutable developmental function.\",\n      \"evidence\": \"Targeted null knockout in mice scored for embryonic lethality\",\n      \"pmids\": [\"15178683\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not identify which developmental process or cell lineage requires PMCA1\", \"Heterozygotes appear normal, leaving dose-sensitivity in adults unaddressed\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Addressed how PMCA1 expression is hormonally controlled, showing tissue-specific transcriptional downregulation of its promoter by 1,25-dihydroxyvitamin D3.\",\n      \"evidence\": \"Luciferase reporter assays with promoter deletions plus EMSA in osteosarcoma vs. kidney cell lines\",\n      \"pmids\": [\"11062020\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Candidate VDRE did not bind VDR/RXRalpha, so the responsible element is unmapped\", \"Mechanism of tissue specificity not resolved\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined how PMCA1 achieves correct polarized targeting, identifying a Leu-Ile motif in the 'b'-tail splice variant that drives basolateral sorting.\",\n      \"evidence\": \"Splice-variant localization and motif dissection in mammalian hair cells\",\n      \"pmids\": [\"16803870\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Trafficking machinery recognizing the motif not identified\", \"Generality beyond hair cells untested\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified a direct protein regulator of PMCA1, showing 14-3-3epsilon binds and inhibits its Ca2+-pumping activity independent of phosphorylation.\",\n      \"evidence\": \"Reciprocal Co-IP and GST pulldown plus aequorin Ca2+ assay in HeLa/CHO cells\",\n      \"pmids\": [\"18029012\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Binding site on PMCA1 not mapped\", \"Physiological context of the inhibition in vivo unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Causally linked ATP2B1 to blood pressure, showing VSMC-specific loss raises intracellular Ca2+, vasoconstriction, and blood pressure.\",\n      \"evidence\": \"VSMC conditional KO with telemetric BP, Ca2+ measurement, and vascular ring assays\",\n      \"pmids\": [\"22311909\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not distinguish whether elevated Ca2+ acts via channels or compensatory transporter changes\", \"Endothelial contribution not separated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed L-type Ca2+ channel upregulation downstream of VSMC ATP2B1 loss as the primary hypertensive mechanism.\",\n      \"evidence\": \"VSMC KO with pharmacological dissection (CCB vs ARB vs alpha-blocker) and channel expression analysis\",\n      \"pmids\": [\"29046519\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling reduced pump activity to channel upregulation unknown\", \"nNOS unchanged, leaving endothelial axis unaddressed here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected ATP2B1 to endothelial NO signaling, showing haploinsufficiency reduces eNOS Ser-1177 phosphorylation and NO production.\",\n      \"evidence\": \"Heterozygous KO mice with vascular relaxation assays, eNOS western blot, and NO measurement\",\n      \"pmids\": [\"24805951\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direction of Ca2+ effect on eNOS not reconciled with later HUVEC data\", \"Endothelial vs smooth muscle contributions to BP not separated\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Mapped the endothelial Ca2+/calmodulin/eNOS/Akt pathway controlled by ATP2B1, where silencing raises Ca2+ and increases eNOS activity and insulin-induced Akt signaling.\",\n      \"evidence\": \"siRNA knockdown in HUVECs with BAPTA-AM, W7, and L-NAME epistasis and Ca2+/NO/Akt readouts\",\n      \"pmids\": [\"29416109\", \"29104511\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cell-culture results show increased eNOS activity, opposite to the in vivo haploinsufficiency phenotype\", \"In vivo relevance of the insulin-sensitivity arm not tested\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established ATP2B1 as the intestinal calcium-extrusion step required for active, vitamin D-responsive calcium absorption and bone mineralization.\",\n      \"evidence\": \"Villin-Cre intestinal KO with active Ca2+ transport, DXA, and hormone measurements\",\n      \"pmids\": [\"26392310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not explain how vitamin D normally upregulates the pump given promoter repression data\", \"Renal contribution not addressed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Extended ATP2B1's role to systemic calcium homeostasis, linking haploinsufficiency to hypocalcemia, hypercalciuria, and altered PTH.\",\n      \"evidence\": \"Heterozygous KO mice with serum/urinary calcium, PTH, BMD, and tissue expression measurement\",\n      \"pmids\": [\"29950683\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct role in parathyroid PTH secretion vs secondary effect not resolved\", \"Increased BMD here contrasts with reduced BMD in intestinal KO\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Showed ATP2B1 loss drives arterial structural remodeling that precedes age-dependent hypertension.\",\n      \"evidence\": \"Longitudinal BP and pressure myography in heterozygous KO mice across ages\",\n      \"pmids\": [\"28795531\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal chain from Ca2+ elevation to remodeling not defined\", \"Cell type responsible for remodeling not isolated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Identified PMCA1 as the sole PMCA isoform required for B-cell Ca2+ handling and development, distinguishing it from PMCA4.\",\n      \"evidence\": \"B-cell conditional KO with FACS, isoform-specific western blot, Ca2+ assays, and PMCA4 KO comparison\",\n      \"pmids\": [\"33098669\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stage at which Ca2+ overload blocks development not pinpointed\", \"Downstream Ca2+-sensitive effectors in B cells not identified\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended the immune role to T cells, showing CD4+ T-cell ATP2B1 loss causes hyperactivation and colitis.\",\n      \"evidence\": \"CD4+ T-cell conditional KO with T-cell FACS, cytokine qRT-PCR, and colon histology\",\n      \"pmids\": [\"38507609\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Ca2+ measurements in the KO T cells not reported in this entry\", \"Whether colitis is T-cell-intrinsic vs microbiome-dependent untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined a stress-responsive inhibitory loop in which calreticulin suppresses PMCA1 via calmodulin and a p38MAPK feedback arm, linking pump inhibition to Ca2+ overload and apoptosis.\",\n      \"evidence\": \"Mechanical stretch of myoblasts with CRT/PMCA1 gain/loss-of-function and pathway inhibitors\",\n      \"pmids\": [\"35976579\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CRT acts directly or via CaM on the pump not biochemically resolved\", \"Relevance beyond stretched myoblasts unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Established de novo ATP2B1 missense variants as a cause of neurodevelopmental disorder through reduced Ca2+ export and plasma-membrane mislocalization.\",\n      \"evidence\": \"Ca2+ imaging, confocal localization, and structural modeling of nine variants in HEK293T cells\",\n      \"pmids\": [\"35358416\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Neuronal cell-type consequences not modeled\", \"Genotype-phenotype correlation across variants not established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrated a biallelic loss-of-function presentation combining neurodevelopmental malformation with primary hypoparathyroidism.\",\n      \"evidence\": \"Trio exome sequencing with fibroblast splicing analysis, Ca2+ extrusion assay, and immunoblotting\",\n      \"pmids\": [\"37926713\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single case limits genotype-phenotype generalization\", \"Mechanism of hypoparathyroidism in this patient not dissected\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Confirmed impaired trafficking and calcium dyshomeostasis as the core pathomechanism with an additional de novo variant.\",\n      \"evidence\": \"Confocal imaging of tagged constructs and Fluo-4 Ca2+ measurement in HEK293T cells\",\n      \"pmids\": [\"41853798\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single variant in heterologous cells\", \"Mechanism of retention/mislocalization not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Revealed an antiviral angle, showing SARS-CoV-2 downregulates ATP2B1 via PI3K/Akt/FOXO3 and that maintaining the pump pharmacologically limits viral replication.\",\n      \"evidence\": \"Caloxin-derivative PI-7 treatment, Ca2+ measurement, infection assays, and pathway analysis\",\n      \"pmids\": [\"38816514\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How intracellular Ca2+ supports viral replication mechanistically unclear\", \"PI-7 specificity for ATP2B1 not fully delineated\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Connected ATP2B1 to developmental angiogenic signaling, identifying it as an FZD4 proximity partner whose Ca2+-lowering activity sustains Norrin/WNT7-FZD4/\\u03b2-catenin signaling by restraining calcineurin/NFAT.\",\n      \"evidence\": \"BioID, endothelial conditional KO with retinal phenotyping, \\u03b2-catenin assays, ionomycin/calcineurin pharmacology, and Gpr124 epistasis (preprint)\",\n      \"pmids\": [\"40777252\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Direct vs indirect FZD4 association not biochemically resolved\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Linked ATP2B1 surface expression to hematopoietic stem cell function, marking LT-HSCs with superior self-renewal and a TFEB-endolysosomal program.\",\n      \"evidence\": \"Surface sorting, in vivo xenograft repopulation, scMultiome, and immunofluorescence\",\n      \"pmids\": [\"42085155\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ATP2B1 is functionally required or merely a marker not established\", \"Mechanistic link between Ca2+ extrusion and the TFEB axis untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how reduced ATP2B1 Ca2+-pump activity produces opposite eNOS/NO outcomes between cultured endothelial cells and intact vessels, and how a single Ca2+-extrusion defect is translated into the divergent tissue phenotypes (hypertension, calcium malabsorption, immune dysregulation, neurodevelopmental disease) by distinct downstream Ca2+ effectors.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model reconciling cell-autonomous Ca2+ rise with tissue-specific signaling outputs\", \"Direct structural basis of variant-induced mislocalization not solved\", \"Endothelial vs smooth-muscle contributions to NO/blood-pressure phenotype not cleanly separated\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140657\", \"supporting_discovery_ids\": [0, 4, 14]},\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [4, 7, 13, 14]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [14, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [1, 14, 21]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [14, 21]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [4, 7, 13]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"YWHAE\",\n      \"FZD4\",\n      \"CALR\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}