{"gene":"CAPNS1","run_date":"2026-06-09T22:57:17","timeline":{"discoveries":[{"year":2000,"finding":"Homozygous disruption of Capn4 (the common small regulatory subunit shared by μ- and m-calpain heterodimers) eliminated both μ- and m-calpain activities in mouse embryonic stem cells and fibroblasts, establishing that CAPNS1/Capn4 is required for the stability and activity of both ubiquitous calpain catalytic subunits. Loss of Capn4 caused mid-gestation lethality with cardiovascular defects, but did not affect cell survival or proliferation in cultured cells.","method":"Homozygous gene disruption (knockout mouse), calpain activity assays, cultured embryonic stem cells and fibroblasts","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genetic knockout with direct enzymatic activity readout, replicated in multiple cell types and in vivo","pmids":["10825211"],"is_preprint":false},{"year":1986,"finding":"The CANP (calpain) small 30K subunit (CAPNS1) has a two-domain structure: an N-terminal domain that is proposed to determine subcellular localization of calpain, and a C-terminal calmodulin-like Ca2+-binding domain that regulates calpain activity.","method":"Protein structure/sequence analysis of rabbit CANP 30K subunit","journal":"Biomedica biochimica acta","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — structural inference from sequence, single lab, no mutagenesis validation reported in abstract","pmids":["3034236"],"is_preprint":false},{"year":2007,"finding":"The CAPNS1 promoter is transcriptionally regulated by NRF-1, AP-1, and Sp1. Site-directed mutagenesis and EMSA/ChIP identified NRF-1 as the dominant transcriptional activator (~70% reduction in promoter activity upon NRF-1 site mutation), with AP-1 contributing ~50% and Sp1 ~30%. siRNA-mediated knockdown of NRF-1 significantly reduced endogenous CAPNS1 mRNA.","method":"Promoter deletion analysis, site-directed mutagenesis, EMSA, supershift assay, chromatin immunoprecipitation (ChIP), siRNA knockdown, reporter gene assay","journal":"Gene","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (mutagenesis, EMSA, ChIP, siRNA) in single lab","pmids":["18234454"],"is_preprint":false},{"year":2008,"finding":"CAPNS1 (Capns1) was identified as a binding partner of the RasGAP-SH3 domain specifically in K-Ras(V12) oncogenic cells. The interaction was confirmed by co-immunoprecipitation and showed co-localization in cell protrusions. Knockdown of Capns1 in K-Ras(V12) cells induced apoptosis and altered cell migration speed and persistence, indicating a role for the CAPNS1–RasGAP-SH3 interaction in cell survival and motility downstream of oncogenic Ras.","method":"Yeast two-hybrid screening, co-immunoprecipitation, confocal microscopy co-localization, siRNA knockdown with apoptosis and migration assays","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — yeast two-hybrid confirmed by reciprocal Co-IP with functional readout, single lab","pmids":["18761085"],"is_preprint":false},{"year":2008,"finding":"Osteoblast-specific conditional knockout of Capn4 in mice severely impaired osteoblast proliferation, differentiation, and matrix mineralization in vitro, and caused reduced bone formation in vivo (smaller body, shorter limbs, reduced trabecular bone, thinner cortices, decreased osteoblast number). CAPNS1/Capn4 was shown to bind directly to the intracellular C-terminal tail of the PTH/PTHrP receptor and modulate its function in osteoblasts.","method":"Cre-LoxP conditional knockout, bone histomorphometry, in vitro osteoblast differentiation assays, binding assay (direct binding to PTH receptor C-tail)","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with multiple in vitro and in vivo phenotypic readouts plus direct binding evidence, single rigorous study","pmids":["18515801"],"is_preprint":false},{"year":2010,"finding":"Chondrocyte-specific deletion of Capn4 impaired chondrocyte proliferation (G1/S arrest) and differentiation in embryonic growth plates. Mechanistically, Capn4 loss led to accumulation of calpain substrate cell-cycle proteins and reduced cyclin D gene transcription; silencing p27(Kip1) rescued the growth defect, and reintroduction of the calpain small subunit partially normalized cyclin D protein levels in a dose-dependent manner.","method":"Conditional Cre-LoxP knockout in chondrocytes, cell cycle analysis, gene expression, p27 siRNA rescue, cyclin D quantification","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with mechanistic rescue experiments and dose-dependent complementation, single rigorous study","pmids":["20368361"],"is_preprint":false},{"year":2012,"finding":"Cardiomyocyte-specific deletion of Capn4 dramatically reduced calpain-1 and calpain-2 protein levels and activities in the heart. In a myocardial infarction model, Capn4 deletion reduced apoptosis, limited infarct expansion, and prevented adverse remodeling. Mechanistically, Capn4 deletion restored IκB protein levels and inhibited NF-κB activation, suppressing proinflammatory cytokine expression and inflammatory cell infiltration.","method":"Cardiomyocyte-specific conditional Capn4 knockout, myocardial infarction model (coronary ligation), calpain activity assay, IκB/NF-κB pathway analysis, cytokine measurements","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with in vivo functional readouts and defined molecular pathway (IκB/NF-κB), single rigorous study","pmids":["22753411"],"is_preprint":false},{"year":2013,"finding":"CAPNS1 is required for stability of the deubiquitinating enzyme USP1. In CAPNS1-depleted cells and MEFs, USP1 is degraded by APC/C(Cdh1)-mediated ubiquitination, leading to stabilization of ubiquitinated PCNA and favoring polymerase-η loading on chromatin with increased mutagenesis. CAPNS1 stabilizes USP1 by activating Cdk5 (via generation of p25), which inhibits Cdh1 and consequently prevents USP1 degradation, linking calpain to the DNA damage response.","method":"siRNA-mediated CAPNS1 depletion in U2OS cells and MEFs, USP1 stability assays, ubiquitinated PCNA detection, polymerase-η chromatin loading, mutagenesis assays, forced Cdk5/p25 expression rescue","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including KD, rescue, and pathway dissection in two cell systems","pmids":["23589330"],"is_preprint":false},{"year":2015,"finding":"Cardiomyocyte-specific capn4 knockout protected the heart from endotoxemia-induced injury. Mechanistically, LPS induced calpain-1 accumulation in mitochondria, where it cleaved ATP synthase-α (ATP5A1), disrupting ATP synthase activity and causing mitochondrial ROS generation that promoted proinflammatory response and cardiac dysfunction. Deletion of capn4 or upregulation of ATP5A1 prevented these events.","method":"Cardiomyocyte-specific capn4 KO mice, LPS endotoxemia model, mitochondrial fractionation, calpain activity in mitochondria, co-localization of calpain-1 with ATP5A1, ATP5A1 cleavage assay, mitochondrial ROS measurement, ATP5A1 overexpression rescue","journal":"Circulation. Heart failure","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with direct substrate cleavage assay (ATP5A1), mitochondrial localization, ROS readout, and rescue by substrate overexpression","pmids":["26246018"],"is_preprint":false},{"year":2009,"finding":"Capn4 overexpression in hepatocellular carcinoma enhanced in vitro invasiveness; siRNA-mediated knockdown of Capn4 in HCC cell lines significantly inhibited mobile and invasive ability, establishing Capn4 as a required factor for HCC cell invasion and metastasis.","method":"siRNA knockdown, in vitro invasion and migration assays, protein quantification in HCC cell lines and patient tumors","journal":"Hepatology (Baltimore, Md.)","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — siRNA loss-of-function with functional invasion readout, replicated in multiple HCC cell lines, single lab","pmids":["19053044"],"is_preprint":false},{"year":2014,"finding":"Capn4 physically associates with FAK and promotes hyperactivity of the FAK-Src signaling pathway via increased phosphorylation of FAK, Src, and p130Cas, leading to upregulation of MMP2 and increased HCC cell invasion and metastasis.","method":"Protein microarray, co-immunoprecipitation (Capn4–FAK interaction), phosphorylation assays, Capn4 overexpression/knockdown with in vitro and in vivo metastasis assays","journal":"The Journal of pathology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP demonstrating physical association plus downstream phosphorylation assays with functional in vivo readout, single lab multiple orthogonal methods","pmids":["24962955"],"is_preprint":false},{"year":2014,"finding":"Capn4 upregulates MMP2 expression through NF-κB activation (increased p65 phosphorylation) to promote nasopharyngeal carcinoma cell migration and invasion in vitro and in vivo.","method":"siRNA knockdown, in vitro migration/invasion assays, in vivo metastasis model, NF-κB p65 phosphorylation assay, MMP2 expression analysis","journal":"Cancer science","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — siRNA knockdown with defined pathway (NF-κB/MMP2) readout, single lab, single method for pathway","pmids":["24703594"],"is_preprint":false},{"year":2016,"finding":"miR-99a and miR-491 directly target CAPNS1 3'-UTR (confirmed by dual-luciferase reporter assay). CAPNS1 positively regulates calpain-1 and calpain-2 protein levels and cleaved caspase-3 (which cleaves PARP1 to induce apoptosis), establishing CAPNS1 as an upstream regulator of calpain-1/2 activity and apoptotic signaling in gastric cancer cells.","method":"Dual-luciferase reporter assay with wild-type and mutated CAPNS1 3'-UTR, miRNA mimic/inhibitor transfection, siRNA, western blot for calpain-1/2 and cleaved caspase-3/PARP1","journal":"International journal of biological sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — confirmed miRNA target site by reporter assay plus downstream pathway demonstration, single lab","pmids":["27994509"],"is_preprint":false},{"year":2020,"finding":"Capn4 promotes gastric cancer metastasis by decreasing β-catenin ubiquitination, thereby enhancing β-catenin protein stability, which activates Wnt/β-catenin signaling and increases MMP9 expression.","method":"Capn4 knockdown/overexpression, ubiquitination assay of β-catenin, β-catenin protein stability assay, Wnt/β-catenin target gene expression, in vitro invasion and in vivo xenograft assays","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ubiquitination assay demonstrating direct mechanism, combined with functional readouts, single lab","pmids":["32777225"],"is_preprint":false},{"year":2021,"finding":"CAPN4 directly interacts with CNOT3 (CCR4-NOT complex subunit 3) and promotes its degradation. CAPN4 knockdown restored CNOT3 levels, which reversed cisplatin resistance and sensitized renal cancer cells to cisplatin-induced necroptosis, establishing a CAPN4–CNOT3 axis in drug resistance.","method":"co-immunoprecipitation, qPCR, western blot, cell viability (CCK-8), flow cytometry for necroptosis, in vivo xenograft","journal":"Translational andrology and urology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — Co-IP confirming direct protein interaction with functional rescue experiments, single lab","pmids":["34733662"],"is_preprint":false},{"year":2022,"finding":"Capn4 directly binds and stabilizes c-Jun by reducing its ubiquitination; Capn4 knockdown increased c-Jun ubiquitination and degradation, and the antihypertrophic effect of Capn4 silencing was partially rescued by c-Jun restoration, placing Capn4 upstream of c-Jun-mediated IGF-AKT signaling in angiotensin II-induced cardiac hypertrophy.","method":"Overexpression and siRNA knockdown, co-immunoprecipitation (Capn4–c-Jun interaction), ubiquitination assay, IGF-AKT signaling measurements, rescue experiments in cardiomyocytes","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ubiquitination assay and rescue experiments, single lab, multiple orthogonal methods","pmids":["34580724"],"is_preprint":false},{"year":2023,"finding":"Biallelic loss-of-function variants in CAPNS1 cause complete absence of CAPNS1 protein (shown by protein expression analysis) and lead to pulmonary arterial hypertension in two unrelated consanguine families, demonstrating that CAPNS1 is essential for pulmonary vascular function in humans.","method":"Exome sequencing, whole-blood RNA analysis (aberrant splicing confirmed), western blot (absence of CAPNS1 protein), RNA sequencing of lung tissue for downstream pathway genes","journal":"Genetics in medicine open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human genetics with protein expression validation in two independent families, limited mechanistic depth beyond LoF","pmids":["38230350"],"is_preprint":false},{"year":2023,"finding":"Myeloid cell-specific deletion of CAPN4 (Capns1) in macrophages ameliorated CVB3-induced myocarditis by preventing NLRP3 inflammasome activation and macrophage M1 polarization. Mechanistically, CAPN4 promoted M1 polarization and NLRP3 activation through upregulation of CHOP, which activated STAT1 and STAT3 phosphorylation to increase proinflammatory cytokine release.","method":"Myeloid-specific conditional Capns1 KO (LYZ2-Cre), CVB3 infection model, NLRP3 inflammasome activation assay, macrophage polarization (M1/M2) markers, CHOP/STAT1/STAT3 phosphorylation analysis, survival and cardiac function assessment","journal":"Free radical biology & medicine","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO with defined molecular pathway (CHOP-STAT1/STAT3) and multiple functional readouts, single lab","pmids":["37660839"],"is_preprint":false},{"year":2023,"finding":"Myeloid-specific Capns1 knockout reduced calpain-1/2 activity in macrophages, maintained ATP5A1 integrity, restored mitochondrial function (preventing ROS generation), and inhibited NLRP3 inflammasome activation, thereby reducing infarct size and cardiac dysfunction after myocardial infarction. ATP5A1 knockdown antagonized the protective effect of Capns1 deletion.","method":"Myeloid-specific conditional Capns1 KO, MI model (coronary ligation), mitochondrial function assays, NLRP3 inflammasome activation assays, ATP5A1 knockdown, cardiac function (echocardiography), histology","journal":"Journal of molecular and cellular cardiology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — conditional KO with substrate (ATP5A1) knockdown counter-rescue and defined downstream mechanism, single lab","pmids":["37689005"],"is_preprint":false},{"year":2022,"finding":"Myeloid cell-specific deletion of Capns1 prevented macrophage polarization toward the M1 phenotype during bleomycin-induced systemic sclerosis, reducing lung inflammation and fibrosis. This was associated with increased PI3K/AKT1 signaling in lung tissue of knockout mice.","method":"Myeloid-specific conditional Capns1 KO, bleomycin model of systemic sclerosis, flow cytometry for macrophage phenotyping (M1/M2), cytokine ELISA, histology, western blot for PI3K/AKT1","journal":"Arthritis research & therapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with macrophage phenotyping and pathway analysis, single lab, single study","pmids":["35729674"],"is_preprint":false},{"year":2023,"finding":"FAT10 (ubiquitin-like protein) promotes Capn4 protein stability in colorectal cancer cells by modifying Capn4 ubiquitination and degradation, establishing FAT10 as an upstream regulator of Capn4 protein levels.","method":"FAT10 overexpression/knockdown, ubiquitination assay for Capn4, western blot, in vitro and in vivo proliferation/invasion assays","journal":"Digestive diseases and sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — ubiquitination assay with functional readout, single lab, limited mechanistic detail in abstract","pmids":["37310562"],"is_preprint":false}],"current_model":"CAPNS1 (Capn4) encodes the common small regulatory subunit essential for the stability and proteolytic activity of both μ-calpain (CAPN1) and m-calpain (CAPN2); its C-terminal calmodulin-like domain binds Ca2+ to regulate calpain activity, while loss of CAPNS1 abolishes both calpain activities, causes mid-gestation lethality in mice, and in specific cell types impairs proliferation, differentiation (osteoblasts, chondrocytes), and cardiac function by allowing accumulation of key calpain substrates including cyclin D, IκB, ATP synthase-α (ATP5A1), USP1, talin, and c-Jun; CAPNS1 also interacts with FAK to activate FAK-Src-MMP2 signaling and with RasGAP-SH3 in oncogenic Ras cells, positions calpain at the interface of cell cycle regulation and DNA repair via the Cdk5/p25–Cdh1–USP1–PCNA axis, and in macrophages controls NLRP3 inflammasome activation and M1 polarization through a CHOP–STAT1/STAT3 pathway."},"narrative":{"mechanistic_narrative":"CAPNS1 (Capn4) encodes the common small regulatory subunit required for the stability and proteolytic activity of both ubiquitous calpain catalytic subunits (calpain-1 and calpain-2); homozygous disruption eliminates both calpain activities and causes mid-gestation lethality with cardiovascular defects [PMID:10825211]. The subunit has a two-domain architecture in which an N-terminal domain influences subcellular localization and a C-terminal calmodulin-like Ca2+-binding domain regulates calpain activity [PMID:3034236], and it positively governs calpain-1/2 protein levels and downstream apoptotic signaling [PMID:27994509]. Through this regulatory role CAPNS1 controls calpain-dependent proteolysis of substrates governing diverse cellular programs: it is required for chondrocyte and osteoblast proliferation and differentiation, with loss causing G1/S arrest, accumulation of cell-cycle proteins, and reduced cyclin D, while p27(Kip1) silencing rescues the growth defect [PMID:18515801, PMID:20368361]. In the heart, CAPNS1 loss restores IκB and limits NF-κB-driven inflammation after infarction [PMID:22753411] and prevents mitochondrial calpain-1 cleavage of ATP synthase-α (ATP5A1), preserving ATP synthase activity and limiting ROS-driven injury [PMID:26246018]. CAPNS1 also stabilizes the deubiquitinase USP1 by activating Cdk5 (via p25) to inhibit Cdh1, thereby controlling ubiquitinated PCNA, polymerase-η loading, and mutagenesis, linking calpain to the DNA damage response [PMID:23589330]. In macrophages, CAPNS1 drives NLRP3 inflammasome activation and M1 polarization through a CHOP–STAT1/STAT3 pathway and via ATP5A1-dependent mitochondrial dysfunction [PMID:37660839, PMID:37689005]. Across multiple cancers CAPNS1 promotes invasion and metastasis by physically associating with FAK to activate FAK–Src–p130Cas–MMP2 signaling [PMID:24962955] and by stabilizing pro-tumorigenic substrates such as β-catenin and c-Jun through reduced ubiquitination [PMID:32777225, PMID:34580724]. Biallelic loss-of-function variants abolishing CAPNS1 protein cause pulmonary arterial hypertension in humans [PMID:38230350].","teleology":[{"year":1986,"claim":"Established the domain organization of the calpain small subunit, distinguishing a localization-determining N-terminal domain from a Ca2+-responsive regulatory module before its in vivo role was known.","evidence":"Protein structure/sequence analysis of rabbit CANP 30K subunit","pmids":["3034236"],"confidence":"Medium","gaps":["Domain functions inferred from sequence without mutagenesis","Ca2+-binding regulation not directly demonstrated for this subunit"]},{"year":2000,"claim":"Resolved whether the small subunit is dispensable by showing its genetic loss abolishes both μ- and m-calpain activity and is embryonic-lethal, defining CAPNS1 as the obligate common regulatory subunit.","evidence":"Homozygous Capn4 knockout mouse with calpain activity assays in ES cells and fibroblasts","pmids":["10825211"],"confidence":"High","gaps":["Cause of mid-gestation cardiovascular lethality not molecularly defined","No substrate-level mechanism identified at this stage"]},{"year":2007,"claim":"Identified how CAPNS1 expression is controlled transcriptionally, naming NRF-1 as the dominant promoter activator with AP-1 and Sp1 contributions.","evidence":"Promoter deletion, mutagenesis, EMSA, ChIP, and siRNA in reporter assays","pmids":["18234454"],"confidence":"High","gaps":["Physiological signals regulating these factors unknown","Tissue-specific promoter usage not addressed"]},{"year":2008,"claim":"Connected CAPNS1 to oncogenic Ras signaling by identifying a Ras-state-specific RasGAP-SH3 interaction controlling survival and motility.","evidence":"Yeast two-hybrid, reciprocal Co-IP, colocalization, and siRNA functional assays in K-Ras(V12) cells","pmids":["18761085"],"confidence":"Medium","gaps":["Whether interaction depends on calpain catalytic activity unclear","Structural basis of SH3 binding not defined"]},{"year":2008,"claim":"Demonstrated a cell-autonomous requirement for CAPNS1 in osteoblast proliferation, differentiation, and bone formation, with direct binding to the PTH/PTHrP receptor C-tail.","evidence":"Osteoblast-specific conditional Capn4 knockout, histomorphometry, in vitro differentiation, and receptor binding assays","pmids":["18515801"],"confidence":"High","gaps":["Calpain substrates mediating osteoblast defects not enumerated","Functional consequence of PTH receptor binding for calpain activity unclear"]},{"year":2010,"claim":"Defined the cell-cycle mechanism of CAPNS1 in chondrocytes, linking loss to G1/S arrest via cyclin D reduction and p27-dependent growth restraint.","evidence":"Chondrocyte-specific Capn4 knockout with cell-cycle analysis, p27 siRNA rescue, and dose-dependent subunit complementation","pmids":["20368361"],"confidence":"High","gaps":["Direct calpain substrate driving cyclin D transcription not identified","Reconciliation with absence of proliferation defect in original KO fibroblasts unaddressed"]},{"year":2012,"claim":"Identified the IκB/NF-κB inflammatory axis as the mechanism by which cardiac calpain promotes post-infarction injury and remodeling.","evidence":"Cardiomyocyte-specific Capn4 knockout in a myocardial infarction model with pathway and cytokine analysis","pmids":["22753411"],"confidence":"High","gaps":["Whether IκB is a direct calpain substrate not shown","Contribution of cardiomyocyte vs other cell types not separated"]},{"year":2013,"claim":"Placed calpain in the DNA damage response by showing CAPNS1 stabilizes USP1 through Cdk5/p25 inhibition of Cdh1, controlling PCNA ubiquitination and mutagenesis.","evidence":"siRNA depletion in U2OS and MEFs with USP1 stability, ubiquitinated-PCNA, pol-η loading, mutagenesis assays, and Cdk5/p25 rescue","pmids":["23589330"],"confidence":"High","gaps":["Direct calpain cleavage event generating p25 in this context not fully resolved","Physiological DNA-damage settings requiring this axis untested in vivo"]},{"year":2015,"claim":"Identified a mitochondrial substrate, ATP synthase-α (ATP5A1), whose calpain-1 cleavage links endotoxemia to ROS-driven cardiac inflammation and dysfunction.","evidence":"Cardiomyocyte-specific Capn4 knockout, LPS model, mitochondrial fractionation, ATP5A1 cleavage and ROS assays, and ATP5A1 overexpression rescue","pmids":["26246018"],"confidence":"High","gaps":["Mechanism of calpain-1 mitochondrial import not defined","Generality of ATP5A1 cleavage beyond endotoxemia not established here"]},{"year":2009,"claim":"Established CAPNS1 as a pro-invasive factor required for hepatocellular carcinoma cell motility and invasion.","evidence":"siRNA knockdown with invasion/migration assays in HCC cell lines and tumor protein quantification","pmids":["19053044"],"confidence":"Medium","gaps":["Molecular mechanism of invasion not defined at this stage","Loss-of-function in vivo metastasis not tested"]},{"year":2014,"claim":"Defined a pro-metastatic signaling mechanism in which CAPNS1 physically associates with FAK to hyperactivate FAK-Src-p130Cas and upregulate MMP2.","evidence":"Protein microarray, reciprocal Co-IP, phosphorylation assays, and overexpression/knockdown with in vivo metastasis in HCC","pmids":["24962955"],"confidence":"High","gaps":["Whether FAK activation requires calpain proteolysis unclear","Direct vs scaffold role of CAPNS1 at the FAK complex not separated"]},{"year":2014,"claim":"Extended the CAPNS1-MMP2 invasion mechanism to nasopharyngeal carcinoma via NF-κB p65 activation.","evidence":"siRNA knockdown with migration/invasion assays, in vivo metastasis, and p65 phosphorylation analysis","pmids":["24703594"],"confidence":"Medium","gaps":["Link between calpain activity and p65 phosphorylation not mechanistically resolved","Single-method pathway readout"]},{"year":2016,"claim":"Positioned CAPNS1 as a miRNA-regulated node (miR-99a, miR-491) and confirmed it as an upstream positive regulator of calpain-1/2 and caspase-3/PARP1 apoptotic signaling.","evidence":"Dual-luciferase 3'-UTR reporter assays, miRNA mimic/inhibitor, siRNA, and western blot in gastric cancer cells","pmids":["27994509"],"confidence":"Medium","gaps":["In vivo relevance of miRNA targeting untested","Mechanism linking calpain to caspase-3 activation not detailed"]},{"year":2020,"claim":"Defined a Wnt-promoting mechanism in which CAPNS1 stabilizes β-catenin by decreasing its ubiquitination to drive gastric cancer metastasis.","evidence":"Knockdown/overexpression with β-catenin ubiquitination and stability assays, target-gene expression, and in vivo xenograft","pmids":["32777225"],"confidence":"Medium","gaps":["Whether β-catenin is a direct calpain substrate or indirectly regulated unclear","Mechanism of reduced ubiquitination undefined"]},{"year":2021,"claim":"Identified a CAPNS1-CNOT3 axis in which CAPNS1 promotes CNOT3 degradation to drive cisplatin resistance in renal cancer.","evidence":"Co-IP, expression analysis, viability and necroptosis assays, and in vivo xenograft","pmids":["34733662"],"confidence":"Medium","gaps":["Direct proteolytic cleavage of CNOT3 not demonstrated","Single-lab finding without reciprocal validation"]},{"year":2022,"claim":"Defined a cardiac hypertrophy mechanism in which CAPNS1 binds and stabilizes c-Jun by reducing its ubiquitination, acting upstream of IGF-AKT signaling.","evidence":"Overexpression/knockdown, Co-IP, ubiquitination assay, IGF-AKT analysis, and c-Jun rescue in cardiomyocytes","pmids":["34580724"],"confidence":"Medium","gaps":["Mechanism by which a protease stabilizes a substrate unresolved","In vivo confirmation limited"]},{"year":2022,"claim":"Showed myeloid CAPNS1 drives M1 macrophage polarization in fibrosis, associated with suppressed PI3K/AKT1 signaling.","evidence":"Myeloid-specific conditional Capns1 knockout in bleomycin systemic sclerosis with macrophage phenotyping and pathway analysis","pmids":["35729674"],"confidence":"Medium","gaps":["Causal link between PI3K/AKT1 and polarization not established","Calpain substrate mediating polarization unidentified"]},{"year":2023,"claim":"Defined macrophage CAPNS1 as a driver of NLRP3 inflammasome activation and M1 polarization through CHOP-dependent STAT1/STAT3 signaling and ATP5A1-dependent mitochondrial dysfunction.","evidence":"Myeloid-specific conditional Capns1 knockout in CVB3 myocarditis and MI models, NLRP3/polarization assays, CHOP-STAT analysis, and ATP5A1 knockdown counter-rescue","pmids":["37660839","37689005"],"confidence":"High","gaps":["Direct calpain substrate upstream of CHOP not identified","Relative contribution of CHOP-STAT vs ATP5A1 arms not quantified"]},{"year":2023,"claim":"Identified upstream control of CAPNS1 protein abundance by the ubiquitin-like protein FAT10, which stabilizes CAPNS1 to support colorectal cancer growth and invasion.","evidence":"FAT10 overexpression/knockdown with CAPNS1 ubiquitination assay and proliferation/invasion readouts","pmids":["37310562"],"confidence":"Medium","gaps":["Mechanism of FAT10-dependent stabilization not detailed","Single-lab finding"]},{"year":2023,"claim":"Established a human disease link by showing biallelic loss-of-function CAPNS1 variants abolishing protein cause pulmonary arterial hypertension.","evidence":"Exome sequencing, splicing and western-blot protein-absence validation in two consanguineous families, and lung RNA-seq","pmids":["38230350"],"confidence":"Medium","gaps":["Mechanism linking calpain loss to pulmonary vascular disease not defined","Only two families; no functional rescue"]},{"year":null,"claim":"It remains unresolved how a regulatory protease subunit reconciles its many context-specific roles — direct enzymatic substrates versus scaffold/stabilizing functions — and which calpain cleavage events causally explain each tissue phenotype.","evidence":"No single study in the corpus integrates substrate-level mechanisms across the cardiac, immune, skeletal, DNA-repair, and oncogenic contexts","pmids":[],"confidence":"Low","gaps":["Several substrate-stabilization claims lack a clear protease-based mechanism","No structural model of CAPNS1 in any partner complex","Tissue-specific substrate repertoires undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[0,8,12]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,1,12]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[4,10]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[8,18]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[3]},{"term_id":"GO:0000228","term_label":"nuclear chromosome","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[5,7]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[6,17,18,19]},{"term_id":"R-HSA-73894","term_label":"DNA Repair","supporting_discovery_ids":[7]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[9,10,13,16]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[7,13,15]}],"complexes":["calpain heterodimer (calpain-1/CAPNS1, calpain-2/CAPNS1)"],"partners":["CAPN1","CAPN2","PTH1R","FAK","CNOT3","USP1","CTNNB1","JUN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P04632","full_name":"Calpain small subunit 1","aliases":["Calcium-activated neutral proteinase small subunit","CANP small subunit","Calcium-dependent protease small subunit","CDPS","Calcium-dependent protease small subunit 1","Calpain regulatory 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cancer","url":"https://pubmed.ncbi.nlm.nih.gov/30444080","citation_count":8,"is_preprint":false},{"pmid":"35729674","id":"PMC_35729674","title":"Myeloid cell-specific deletion of Capns1 prevents macrophage polarization toward the M1 phenotype and reduces interstitial lung disease in the bleomycin model of systemic sclerosis.","date":"2022","source":"Arthritis research & therapy","url":"https://pubmed.ncbi.nlm.nih.gov/35729674","citation_count":8,"is_preprint":false},{"pmid":"29648579","id":"PMC_29648579","title":"Capn4 contributes to tumor invasion and metastasis in clear cell renal cell carcinoma cells via modulating talin-focal adhesion kinase signaling pathway.","date":"2018","source":"Acta biochimica et biophysica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/29648579","citation_count":8,"is_preprint":false},{"pmid":"37689005","id":"PMC_37689005","title":"Myeloid-specific deletion of Capns1 attenuates myocardial infarction injury via restoring mitochondrial function and inhibiting inflammasome activation.","date":"2023","source":"Journal of molecular and cellular cardiology","url":"https://pubmed.ncbi.nlm.nih.gov/37689005","citation_count":8,"is_preprint":false},{"pmid":"22890884","id":"PMC_22890884","title":"Silkworm 30K protein inhibits ecdysone-induced apoptosis by blocking the binding of ultraspiracle to ecdysone receptor-B1 in cultured Bm5 cells.","date":"2012","source":"Archives of insect biochemistry and physiology","url":"https://pubmed.ncbi.nlm.nih.gov/22890884","citation_count":7,"is_preprint":false},{"pmid":"27107566","id":"PMC_27107566","title":"Changes in 30K protein synthesis during delayed degeneration of the silk gland by a caspase-dependent pathway in a Bombyx (silkworm) mutant.","date":"2016","source":"Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology","url":"https://pubmed.ncbi.nlm.nih.gov/27107566","citation_count":7,"is_preprint":false},{"pmid":"19880143","id":"PMC_19880143","title":"Induction of paranodal myelin detachment and sodium channel loss in vivo by Campylobacter jejuni DNA-binding protein from starved cells (C-Dps) in myelinated nerve fibers.","date":"2009","source":"Journal of the neurological sciences","url":"https://pubmed.ncbi.nlm.nih.gov/19880143","citation_count":7,"is_preprint":false},{"pmid":"34580724","id":"PMC_34580724","title":"Capn4 aggravates angiotensin II-induced cardiac hypertrophy by activating the IGF-AKT signalling pathway.","date":"2022","source":"Journal of biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/34580724","citation_count":6,"is_preprint":false},{"pmid":"24091439","id":"PMC_24091439","title":"Differential proteomic analysis of caveolin-1 KO cells reveals Sh2b3 and Clec12b as novel interaction partners of caveolin-1 and Capns1 as a potential mediator of caveolin-1-induced apoptosis.","date":"2013","source":"The Analyst","url":"https://pubmed.ncbi.nlm.nih.gov/24091439","citation_count":6,"is_preprint":false},{"pmid":"19649723","id":"PMC_19649723","title":"A new SNP in the 3'UTR region of the bovine calpain small subunit (CAPNS1) gene.","date":"2009","source":"Molecular biology reports","url":"https://pubmed.ncbi.nlm.nih.gov/19649723","citation_count":6,"is_preprint":false},{"pmid":"33918180","id":"PMC_33918180","title":"Analysis of Missense Variants in the Human Histamine Receptor Family Reveals Increased Constitutive Activity of E4106.30×30K Variant in the Histamine H1 Receptor.","date":"2021","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/33918180","citation_count":6,"is_preprint":false},{"pmid":"36776972","id":"PMC_36776972","title":"Vitellogenin receptor transports the 30K protein LP1 without cell-penetrating peptide, into the oocytes of the silkworm, Bombyx mori.","date":"2023","source":"Frontiers in physiology","url":"https://pubmed.ncbi.nlm.nih.gov/36776972","citation_count":5,"is_preprint":false},{"pmid":"26262600","id":"PMC_26262600","title":"Tissue distribution, excretion, and the metabolic pathway of 2,2',4,4',5-penta-chlorinated diphenylsulfide (CDPS-99) in ICR mice.","date":"2015","source":"Journal of chromatography. B, Analytical technologies in the biomedical and life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/26262600","citation_count":5,"is_preprint":false},{"pmid":"29475053","id":"PMC_29475053","title":"Exploring the role of cellular homologous of the 30K-superfamily of plant virus movement proteins.","date":"2018","source":"Virus research","url":"https://pubmed.ncbi.nlm.nih.gov/29475053","citation_count":5,"is_preprint":false},{"pmid":"37310562","id":"PMC_37310562","title":"Ubiquitin-Like Protein FAT10 Promote Colorectal Cancer Progression by Affecting the Ubiquitination of Capn4.","date":"2023","source":"Digestive diseases and sciences","url":"https://pubmed.ncbi.nlm.nih.gov/37310562","citation_count":4,"is_preprint":false},{"pmid":"3034236","id":"PMC_3034236","title":"Structure and function of the small (30K) subunit of calcium-activated neutral protease (CANP).","date":"1986","source":"Biomedica biochimica acta","url":"https://pubmed.ncbi.nlm.nih.gov/3034236","citation_count":4,"is_preprint":false},{"pmid":"36354184","id":"PMC_36354184","title":"Capn4 regulates Snail to promote the epithelial-mesenchymal transition of nasopharyngeal carcinoma by mediating the transcriptional activity of claudin-11.","date":"2022","source":"The Kaohsiung journal of medical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/36354184","citation_count":3,"is_preprint":false},{"pmid":"39711101","id":"PMC_39711101","title":"Engineering VIGS Vectors by Modifying Movement Proteins of the 30K Family.","date":"2024","source":"Biotechnology journal","url":"https://pubmed.ncbi.nlm.nih.gov/39711101","citation_count":3,"is_preprint":false},{"pmid":"40999317","id":"PMC_40999317","title":"Lettuce Big-Vein Associated Virus ORF3 Encodes a Functional 30K Movement Protein.","date":"2025","source":"Molecular plant pathology","url":"https://pubmed.ncbi.nlm.nih.gov/40999317","citation_count":3,"is_preprint":false},{"pmid":"12698005","id":"PMC_12698005","title":"Molecular characterization of the porcine gene CAPNS1 encoding the small subunit 1 of calpain on SSC6q1.1-->q1.2.","date":"2002","source":"Cytogenetic and genome research","url":"https://pubmed.ncbi.nlm.nih.gov/12698005","citation_count":3,"is_preprint":false},{"pmid":"9028031","id":"PMC_9028031","title":"Micro-assay method for evaluating the allergenicity of the major soybean allergen, Gly m Bd 30K, with mouse antiserum and RBL-2H3 cells.","date":"1997","source":"Bioscience, biotechnology, and biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9028031","citation_count":3,"is_preprint":false},{"pmid":"31966590","id":"PMC_31966590","title":"Capn4 induces human renal cancer cell proliferation by activating NF-κB signaling pathway through FAK phosphorylation.","date":"2017","source":"International journal of clinical and experimental pathology","url":"https://pubmed.ncbi.nlm.nih.gov/31966590","citation_count":2,"is_preprint":false},{"pmid":"39596316","id":"PMC_39596316","title":"Identification of Host Factors Interacting with Movement Proteins of the 30K Family in Nicotiana tabacum.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39596316","citation_count":2,"is_preprint":false},{"pmid":"38230350","id":"PMC_38230350","title":"Biallelic variants in the calpain regulatory subunit CAPNS1 cause pulmonary arterial hypertension.","date":"2023","source":"Genetics in medicine open","url":"https://pubmed.ncbi.nlm.nih.gov/38230350","citation_count":1,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48131,"output_tokens":5697,"usd":0.114924,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14326,"output_tokens":6106,"usd":0.11214,"stage2_stop_reason":"end_turn"},"total_usd":0.227064,"stage1_batch_id":"msgbatch_01ACAxJQabDsht39JXeWG22d","stage2_batch_id":"msgbatch_01QEU22A9U5sbPTgsMzTmvSf","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"Homozygous disruption of Capn4 (the common small regulatory subunit shared by μ- and m-calpain heterodimers) eliminated both μ- and m-calpain activities in mouse embryonic stem cells and fibroblasts, establishing that CAPNS1/Capn4 is required for the stability and activity of both ubiquitous calpain catalytic subunits. Loss of Capn4 caused mid-gestation lethality with cardiovascular defects, but did not affect cell survival or proliferation in cultured cells.\",\n      \"method\": \"Homozygous gene disruption (knockout mouse), calpain activity assays, cultured embryonic stem cells and fibroblasts\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genetic knockout with direct enzymatic activity readout, replicated in multiple cell types and in vivo\",\n      \"pmids\": [\"10825211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1986,\n      \"finding\": \"The CANP (calpain) small 30K subunit (CAPNS1) has a two-domain structure: an N-terminal domain that is proposed to determine subcellular localization of calpain, and a C-terminal calmodulin-like Ca2+-binding domain that regulates calpain activity.\",\n      \"method\": \"Protein structure/sequence analysis of rabbit CANP 30K subunit\",\n      \"journal\": \"Biomedica biochimica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — structural inference from sequence, single lab, no mutagenesis validation reported in abstract\",\n      \"pmids\": [\"3034236\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"The CAPNS1 promoter is transcriptionally regulated by NRF-1, AP-1, and Sp1. Site-directed mutagenesis and EMSA/ChIP identified NRF-1 as the dominant transcriptional activator (~70% reduction in promoter activity upon NRF-1 site mutation), with AP-1 contributing ~50% and Sp1 ~30%. siRNA-mediated knockdown of NRF-1 significantly reduced endogenous CAPNS1 mRNA.\",\n      \"method\": \"Promoter deletion analysis, site-directed mutagenesis, EMSA, supershift assay, chromatin immunoprecipitation (ChIP), siRNA knockdown, reporter gene assay\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (mutagenesis, EMSA, ChIP, siRNA) in single lab\",\n      \"pmids\": [\"18234454\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CAPNS1 (Capns1) was identified as a binding partner of the RasGAP-SH3 domain specifically in K-Ras(V12) oncogenic cells. The interaction was confirmed by co-immunoprecipitation and showed co-localization in cell protrusions. Knockdown of Capns1 in K-Ras(V12) cells induced apoptosis and altered cell migration speed and persistence, indicating a role for the CAPNS1–RasGAP-SH3 interaction in cell survival and motility downstream of oncogenic Ras.\",\n      \"method\": \"Yeast two-hybrid screening, co-immunoprecipitation, confocal microscopy co-localization, siRNA knockdown with apoptosis and migration assays\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — yeast two-hybrid confirmed by reciprocal Co-IP with functional readout, single lab\",\n      \"pmids\": [\"18761085\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Osteoblast-specific conditional knockout of Capn4 in mice severely impaired osteoblast proliferation, differentiation, and matrix mineralization in vitro, and caused reduced bone formation in vivo (smaller body, shorter limbs, reduced trabecular bone, thinner cortices, decreased osteoblast number). CAPNS1/Capn4 was shown to bind directly to the intracellular C-terminal tail of the PTH/PTHrP receptor and modulate its function in osteoblasts.\",\n      \"method\": \"Cre-LoxP conditional knockout, bone histomorphometry, in vitro osteoblast differentiation assays, binding assay (direct binding to PTH receptor C-tail)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with multiple in vitro and in vivo phenotypic readouts plus direct binding evidence, single rigorous study\",\n      \"pmids\": [\"18515801\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Chondrocyte-specific deletion of Capn4 impaired chondrocyte proliferation (G1/S arrest) and differentiation in embryonic growth plates. Mechanistically, Capn4 loss led to accumulation of calpain substrate cell-cycle proteins and reduced cyclin D gene transcription; silencing p27(Kip1) rescued the growth defect, and reintroduction of the calpain small subunit partially normalized cyclin D protein levels in a dose-dependent manner.\",\n      \"method\": \"Conditional Cre-LoxP knockout in chondrocytes, cell cycle analysis, gene expression, p27 siRNA rescue, cyclin D quantification\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with mechanistic rescue experiments and dose-dependent complementation, single rigorous study\",\n      \"pmids\": [\"20368361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Cardiomyocyte-specific deletion of Capn4 dramatically reduced calpain-1 and calpain-2 protein levels and activities in the heart. In a myocardial infarction model, Capn4 deletion reduced apoptosis, limited infarct expansion, and prevented adverse remodeling. Mechanistically, Capn4 deletion restored IκB protein levels and inhibited NF-κB activation, suppressing proinflammatory cytokine expression and inflammatory cell infiltration.\",\n      \"method\": \"Cardiomyocyte-specific conditional Capn4 knockout, myocardial infarction model (coronary ligation), calpain activity assay, IκB/NF-κB pathway analysis, cytokine measurements\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with in vivo functional readouts and defined molecular pathway (IκB/NF-κB), single rigorous study\",\n      \"pmids\": [\"22753411\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"CAPNS1 is required for stability of the deubiquitinating enzyme USP1. In CAPNS1-depleted cells and MEFs, USP1 is degraded by APC/C(Cdh1)-mediated ubiquitination, leading to stabilization of ubiquitinated PCNA and favoring polymerase-η loading on chromatin with increased mutagenesis. CAPNS1 stabilizes USP1 by activating Cdk5 (via generation of p25), which inhibits Cdh1 and consequently prevents USP1 degradation, linking calpain to the DNA damage response.\",\n      \"method\": \"siRNA-mediated CAPNS1 depletion in U2OS cells and MEFs, USP1 stability assays, ubiquitinated PCNA detection, polymerase-η chromatin loading, mutagenesis assays, forced Cdk5/p25 expression rescue\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including KD, rescue, and pathway dissection in two cell systems\",\n      \"pmids\": [\"23589330\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cardiomyocyte-specific capn4 knockout protected the heart from endotoxemia-induced injury. Mechanistically, LPS induced calpain-1 accumulation in mitochondria, where it cleaved ATP synthase-α (ATP5A1), disrupting ATP synthase activity and causing mitochondrial ROS generation that promoted proinflammatory response and cardiac dysfunction. Deletion of capn4 or upregulation of ATP5A1 prevented these events.\",\n      \"method\": \"Cardiomyocyte-specific capn4 KO mice, LPS endotoxemia model, mitochondrial fractionation, calpain activity in mitochondria, co-localization of calpain-1 with ATP5A1, ATP5A1 cleavage assay, mitochondrial ROS measurement, ATP5A1 overexpression rescue\",\n      \"journal\": \"Circulation. Heart failure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with direct substrate cleavage assay (ATP5A1), mitochondrial localization, ROS readout, and rescue by substrate overexpression\",\n      \"pmids\": [\"26246018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Capn4 overexpression in hepatocellular carcinoma enhanced in vitro invasiveness; siRNA-mediated knockdown of Capn4 in HCC cell lines significantly inhibited mobile and invasive ability, establishing Capn4 as a required factor for HCC cell invasion and metastasis.\",\n      \"method\": \"siRNA knockdown, in vitro invasion and migration assays, protein quantification in HCC cell lines and patient tumors\",\n      \"journal\": \"Hepatology (Baltimore, Md.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — siRNA loss-of-function with functional invasion readout, replicated in multiple HCC cell lines, single lab\",\n      \"pmids\": [\"19053044\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Capn4 physically associates with FAK and promotes hyperactivity of the FAK-Src signaling pathway via increased phosphorylation of FAK, Src, and p130Cas, leading to upregulation of MMP2 and increased HCC cell invasion and metastasis.\",\n      \"method\": \"Protein microarray, co-immunoprecipitation (Capn4–FAK interaction), phosphorylation assays, Capn4 overexpression/knockdown with in vitro and in vivo metastasis assays\",\n      \"journal\": \"The Journal of pathology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP demonstrating physical association plus downstream phosphorylation assays with functional in vivo readout, single lab multiple orthogonal methods\",\n      \"pmids\": [\"24962955\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Capn4 upregulates MMP2 expression through NF-κB activation (increased p65 phosphorylation) to promote nasopharyngeal carcinoma cell migration and invasion in vitro and in vivo.\",\n      \"method\": \"siRNA knockdown, in vitro migration/invasion assays, in vivo metastasis model, NF-κB p65 phosphorylation assay, MMP2 expression analysis\",\n      \"journal\": \"Cancer science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — siRNA knockdown with defined pathway (NF-κB/MMP2) readout, single lab, single method for pathway\",\n      \"pmids\": [\"24703594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"miR-99a and miR-491 directly target CAPNS1 3'-UTR (confirmed by dual-luciferase reporter assay). CAPNS1 positively regulates calpain-1 and calpain-2 protein levels and cleaved caspase-3 (which cleaves PARP1 to induce apoptosis), establishing CAPNS1 as an upstream regulator of calpain-1/2 activity and apoptotic signaling in gastric cancer cells.\",\n      \"method\": \"Dual-luciferase reporter assay with wild-type and mutated CAPNS1 3'-UTR, miRNA mimic/inhibitor transfection, siRNA, western blot for calpain-1/2 and cleaved caspase-3/PARP1\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — confirmed miRNA target site by reporter assay plus downstream pathway demonstration, single lab\",\n      \"pmids\": [\"27994509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Capn4 promotes gastric cancer metastasis by decreasing β-catenin ubiquitination, thereby enhancing β-catenin protein stability, which activates Wnt/β-catenin signaling and increases MMP9 expression.\",\n      \"method\": \"Capn4 knockdown/overexpression, ubiquitination assay of β-catenin, β-catenin protein stability assay, Wnt/β-catenin target gene expression, in vitro invasion and in vivo xenograft assays\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assay demonstrating direct mechanism, combined with functional readouts, single lab\",\n      \"pmids\": [\"32777225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CAPN4 directly interacts with CNOT3 (CCR4-NOT complex subunit 3) and promotes its degradation. CAPN4 knockdown restored CNOT3 levels, which reversed cisplatin resistance and sensitized renal cancer cells to cisplatin-induced necroptosis, establishing a CAPN4–CNOT3 axis in drug resistance.\",\n      \"method\": \"co-immunoprecipitation, qPCR, western blot, cell viability (CCK-8), flow cytometry for necroptosis, in vivo xenograft\",\n      \"journal\": \"Translational andrology and urology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — Co-IP confirming direct protein interaction with functional rescue experiments, single lab\",\n      \"pmids\": [\"34733662\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Capn4 directly binds and stabilizes c-Jun by reducing its ubiquitination; Capn4 knockdown increased c-Jun ubiquitination and degradation, and the antihypertrophic effect of Capn4 silencing was partially rescued by c-Jun restoration, placing Capn4 upstream of c-Jun-mediated IGF-AKT signaling in angiotensin II-induced cardiac hypertrophy.\",\n      \"method\": \"Overexpression and siRNA knockdown, co-immunoprecipitation (Capn4–c-Jun interaction), ubiquitination assay, IGF-AKT signaling measurements, rescue experiments in cardiomyocytes\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with ubiquitination assay and rescue experiments, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"34580724\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Biallelic loss-of-function variants in CAPNS1 cause complete absence of CAPNS1 protein (shown by protein expression analysis) and lead to pulmonary arterial hypertension in two unrelated consanguine families, demonstrating that CAPNS1 is essential for pulmonary vascular function in humans.\",\n      \"method\": \"Exome sequencing, whole-blood RNA analysis (aberrant splicing confirmed), western blot (absence of CAPNS1 protein), RNA sequencing of lung tissue for downstream pathway genes\",\n      \"journal\": \"Genetics in medicine open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human genetics with protein expression validation in two independent families, limited mechanistic depth beyond LoF\",\n      \"pmids\": [\"38230350\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Myeloid cell-specific deletion of CAPN4 (Capns1) in macrophages ameliorated CVB3-induced myocarditis by preventing NLRP3 inflammasome activation and macrophage M1 polarization. Mechanistically, CAPN4 promoted M1 polarization and NLRP3 activation through upregulation of CHOP, which activated STAT1 and STAT3 phosphorylation to increase proinflammatory cytokine release.\",\n      \"method\": \"Myeloid-specific conditional Capns1 KO (LYZ2-Cre), CVB3 infection model, NLRP3 inflammasome activation assay, macrophage polarization (M1/M2) markers, CHOP/STAT1/STAT3 phosphorylation analysis, survival and cardiac function assessment\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with defined molecular pathway (CHOP-STAT1/STAT3) and multiple functional readouts, single lab\",\n      \"pmids\": [\"37660839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Myeloid-specific Capns1 knockout reduced calpain-1/2 activity in macrophages, maintained ATP5A1 integrity, restored mitochondrial function (preventing ROS generation), and inhibited NLRP3 inflammasome activation, thereby reducing infarct size and cardiac dysfunction after myocardial infarction. ATP5A1 knockdown antagonized the protective effect of Capns1 deletion.\",\n      \"method\": \"Myeloid-specific conditional Capns1 KO, MI model (coronary ligation), mitochondrial function assays, NLRP3 inflammasome activation assays, ATP5A1 knockdown, cardiac function (echocardiography), histology\",\n      \"journal\": \"Journal of molecular and cellular cardiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with substrate (ATP5A1) knockdown counter-rescue and defined downstream mechanism, single lab\",\n      \"pmids\": [\"37689005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Myeloid cell-specific deletion of Capns1 prevented macrophage polarization toward the M1 phenotype during bleomycin-induced systemic sclerosis, reducing lung inflammation and fibrosis. This was associated with increased PI3K/AKT1 signaling in lung tissue of knockout mice.\",\n      \"method\": \"Myeloid-specific conditional Capns1 KO, bleomycin model of systemic sclerosis, flow cytometry for macrophage phenotyping (M1/M2), cytokine ELISA, histology, western blot for PI3K/AKT1\",\n      \"journal\": \"Arthritis research & therapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with macrophage phenotyping and pathway analysis, single lab, single study\",\n      \"pmids\": [\"35729674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"FAT10 (ubiquitin-like protein) promotes Capn4 protein stability in colorectal cancer cells by modifying Capn4 ubiquitination and degradation, establishing FAT10 as an upstream regulator of Capn4 protein levels.\",\n      \"method\": \"FAT10 overexpression/knockdown, ubiquitination assay for Capn4, western blot, in vitro and in vivo proliferation/invasion assays\",\n      \"journal\": \"Digestive diseases and sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — ubiquitination assay with functional readout, single lab, limited mechanistic detail in abstract\",\n      \"pmids\": [\"37310562\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CAPNS1 (Capn4) encodes the common small regulatory subunit essential for the stability and proteolytic activity of both μ-calpain (CAPN1) and m-calpain (CAPN2); its C-terminal calmodulin-like domain binds Ca2+ to regulate calpain activity, while loss of CAPNS1 abolishes both calpain activities, causes mid-gestation lethality in mice, and in specific cell types impairs proliferation, differentiation (osteoblasts, chondrocytes), and cardiac function by allowing accumulation of key calpain substrates including cyclin D, IκB, ATP synthase-α (ATP5A1), USP1, talin, and c-Jun; CAPNS1 also interacts with FAK to activate FAK-Src-MMP2 signaling and with RasGAP-SH3 in oncogenic Ras cells, positions calpain at the interface of cell cycle regulation and DNA repair via the Cdk5/p25–Cdh1–USP1–PCNA axis, and in macrophages controls NLRP3 inflammasome activation and M1 polarization through a CHOP–STAT1/STAT3 pathway.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CAPNS1 (Capn4) encodes the common small regulatory subunit required for the stability and proteolytic activity of both ubiquitous calpain catalytic subunits (calpain-1 and calpain-2); homozygous disruption eliminates both calpain activities and causes mid-gestation lethality with cardiovascular defects [#0]. The subunit has a two-domain architecture in which an N-terminal domain influences subcellular localization and a C-terminal calmodulin-like Ca2+-binding domain regulates calpain activity [#1], and it positively governs calpain-1/2 protein levels and downstream apoptotic signaling [#12]. Through this regulatory role CAPNS1 controls calpain-dependent proteolysis of substrates governing diverse cellular programs: it is required for chondrocyte and osteoblast proliferation and differentiation, with loss causing G1/S arrest, accumulation of cell-cycle proteins, and reduced cyclin D, while p27(Kip1) silencing rescues the growth defect [#4, #5]. In the heart, CAPNS1 loss restores IκB and limits NF-κB-driven inflammation after infarction [#6] and prevents mitochondrial calpain-1 cleavage of ATP synthase-α (ATP5A1), preserving ATP synthase activity and limiting ROS-driven injury [#8]. CAPNS1 also stabilizes the deubiquitinase USP1 by activating Cdk5 (via p25) to inhibit Cdh1, thereby controlling ubiquitinated PCNA, polymerase-η loading, and mutagenesis, linking calpain to the DNA damage response [#7]. In macrophages, CAPNS1 drives NLRP3 inflammasome activation and M1 polarization through a CHOP–STAT1/STAT3 pathway and via ATP5A1-dependent mitochondrial dysfunction [#17, #18]. Across multiple cancers CAPNS1 promotes invasion and metastasis by physically associating with FAK to activate FAK–Src–p130Cas–MMP2 signaling [#10] and by stabilizing pro-tumorigenic substrates such as β-catenin and c-Jun through reduced ubiquitination [#13, #15]. Biallelic loss-of-function variants abolishing CAPNS1 protein cause pulmonary arterial hypertension in humans [#16].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Established the domain organization of the calpain small subunit, distinguishing a localization-determining N-terminal domain from a Ca2+-responsive regulatory module before its in vivo role was known.\",\n      \"evidence\": \"Protein structure/sequence analysis of rabbit CANP 30K subunit\",\n      \"pmids\": [\"3034236\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Domain functions inferred from sequence without mutagenesis\", \"Ca2+-binding regulation not directly demonstrated for this subunit\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Resolved whether the small subunit is dispensable by showing its genetic loss abolishes both μ- and m-calpain activity and is embryonic-lethal, defining CAPNS1 as the obligate common regulatory subunit.\",\n      \"evidence\": \"Homozygous Capn4 knockout mouse with calpain activity assays in ES cells and fibroblasts\",\n      \"pmids\": [\"10825211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cause of mid-gestation cardiovascular lethality not molecularly defined\", \"No substrate-level mechanism identified at this stage\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Identified how CAPNS1 expression is controlled transcriptionally, naming NRF-1 as the dominant promoter activator with AP-1 and Sp1 contributions.\",\n      \"evidence\": \"Promoter deletion, mutagenesis, EMSA, ChIP, and siRNA in reporter assays\",\n      \"pmids\": [\"18234454\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological signals regulating these factors unknown\", \"Tissue-specific promoter usage not addressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Connected CAPNS1 to oncogenic Ras signaling by identifying a Ras-state-specific RasGAP-SH3 interaction controlling survival and motility.\",\n      \"evidence\": \"Yeast two-hybrid, reciprocal Co-IP, colocalization, and siRNA functional assays in K-Ras(V12) cells\",\n      \"pmids\": [\"18761085\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether interaction depends on calpain catalytic activity unclear\", \"Structural basis of SH3 binding not defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Demonstrated a cell-autonomous requirement for CAPNS1 in osteoblast proliferation, differentiation, and bone formation, with direct binding to the PTH/PTHrP receptor C-tail.\",\n      \"evidence\": \"Osteoblast-specific conditional Capn4 knockout, histomorphometry, in vitro differentiation, and receptor binding assays\",\n      \"pmids\": [\"18515801\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Calpain substrates mediating osteoblast defects not enumerated\", \"Functional consequence of PTH receptor binding for calpain activity unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the cell-cycle mechanism of CAPNS1 in chondrocytes, linking loss to G1/S arrest via cyclin D reduction and p27-dependent growth restraint.\",\n      \"evidence\": \"Chondrocyte-specific Capn4 knockout with cell-cycle analysis, p27 siRNA rescue, and dose-dependent subunit complementation\",\n      \"pmids\": [\"20368361\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct calpain substrate driving cyclin D transcription not identified\", \"Reconciliation with absence of proliferation defect in original KO fibroblasts unaddressed\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Identified the IκB/NF-κB inflammatory axis as the mechanism by which cardiac calpain promotes post-infarction injury and remodeling.\",\n      \"evidence\": \"Cardiomyocyte-specific Capn4 knockout in a myocardial infarction model with pathway and cytokine analysis\",\n      \"pmids\": [\"22753411\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether IκB is a direct calpain substrate not shown\", \"Contribution of cardiomyocyte vs other cell types not separated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placed calpain in the DNA damage response by showing CAPNS1 stabilizes USP1 through Cdk5/p25 inhibition of Cdh1, controlling PCNA ubiquitination and mutagenesis.\",\n      \"evidence\": \"siRNA depletion in U2OS and MEFs with USP1 stability, ubiquitinated-PCNA, pol-η loading, mutagenesis assays, and Cdk5/p25 rescue\",\n      \"pmids\": [\"23589330\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct calpain cleavage event generating p25 in this context not fully resolved\", \"Physiological DNA-damage settings requiring this axis untested in vivo\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified a mitochondrial substrate, ATP synthase-α (ATP5A1), whose calpain-1 cleavage links endotoxemia to ROS-driven cardiac inflammation and dysfunction.\",\n      \"evidence\": \"Cardiomyocyte-specific Capn4 knockout, LPS model, mitochondrial fractionation, ATP5A1 cleavage and ROS assays, and ATP5A1 overexpression rescue\",\n      \"pmids\": [\"26246018\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of calpain-1 mitochondrial import not defined\", \"Generality of ATP5A1 cleavage beyond endotoxemia not established here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established CAPNS1 as a pro-invasive factor required for hepatocellular carcinoma cell motility and invasion.\",\n      \"evidence\": \"siRNA knockdown with invasion/migration assays in HCC cell lines and tumor protein quantification\",\n      \"pmids\": [\"19053044\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism of invasion not defined at this stage\", \"Loss-of-function in vivo metastasis not tested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined a pro-metastatic signaling mechanism in which CAPNS1 physically associates with FAK to hyperactivate FAK-Src-p130Cas and upregulate MMP2.\",\n      \"evidence\": \"Protein microarray, reciprocal Co-IP, phosphorylation assays, and overexpression/knockdown with in vivo metastasis in HCC\",\n      \"pmids\": [\"24962955\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether FAK activation requires calpain proteolysis unclear\", \"Direct vs scaffold role of CAPNS1 at the FAK complex not separated\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended the CAPNS1-MMP2 invasion mechanism to nasopharyngeal carcinoma via NF-κB p65 activation.\",\n      \"evidence\": \"siRNA knockdown with migration/invasion assays, in vivo metastasis, and p65 phosphorylation analysis\",\n      \"pmids\": [\"24703594\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Link between calpain activity and p65 phosphorylation not mechanistically resolved\", \"Single-method pathway readout\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Positioned CAPNS1 as a miRNA-regulated node (miR-99a, miR-491) and confirmed it as an upstream positive regulator of calpain-1/2 and caspase-3/PARP1 apoptotic signaling.\",\n      \"evidence\": \"Dual-luciferase 3'-UTR reporter assays, miRNA mimic/inhibitor, siRNA, and western blot in gastric cancer cells\",\n      \"pmids\": [\"27994509\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo relevance of miRNA targeting untested\", \"Mechanism linking calpain to caspase-3 activation not detailed\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Defined a Wnt-promoting mechanism in which CAPNS1 stabilizes β-catenin by decreasing its ubiquitination to drive gastric cancer metastasis.\",\n      \"evidence\": \"Knockdown/overexpression with β-catenin ubiquitination and stability assays, target-gene expression, and in vivo xenograft\",\n      \"pmids\": [\"32777225\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether β-catenin is a direct calpain substrate or indirectly regulated unclear\", \"Mechanism of reduced ubiquitination undefined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Identified a CAPNS1-CNOT3 axis in which CAPNS1 promotes CNOT3 degradation to drive cisplatin resistance in renal cancer.\",\n      \"evidence\": \"Co-IP, expression analysis, viability and necroptosis assays, and in vivo xenograft\",\n      \"pmids\": [\"34733662\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct proteolytic cleavage of CNOT3 not demonstrated\", \"Single-lab finding without reciprocal validation\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Defined a cardiac hypertrophy mechanism in which CAPNS1 binds and stabilizes c-Jun by reducing its ubiquitination, acting upstream of IGF-AKT signaling.\",\n      \"evidence\": \"Overexpression/knockdown, Co-IP, ubiquitination assay, IGF-AKT analysis, and c-Jun rescue in cardiomyocytes\",\n      \"pmids\": [\"34580724\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which a protease stabilizes a substrate unresolved\", \"In vivo confirmation limited\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed myeloid CAPNS1 drives M1 macrophage polarization in fibrosis, associated with suppressed PI3K/AKT1 signaling.\",\n      \"evidence\": \"Myeloid-specific conditional Capns1 knockout in bleomycin systemic sclerosis with macrophage phenotyping and pathway analysis\",\n      \"pmids\": [\"35729674\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal link between PI3K/AKT1 and polarization not established\", \"Calpain substrate mediating polarization unidentified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined macrophage CAPNS1 as a driver of NLRP3 inflammasome activation and M1 polarization through CHOP-dependent STAT1/STAT3 signaling and ATP5A1-dependent mitochondrial dysfunction.\",\n      \"evidence\": \"Myeloid-specific conditional Capns1 knockout in CVB3 myocarditis and MI models, NLRP3/polarization assays, CHOP-STAT analysis, and ATP5A1 knockdown counter-rescue\",\n      \"pmids\": [\"37660839\", \"37689005\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct calpain substrate upstream of CHOP not identified\", \"Relative contribution of CHOP-STAT vs ATP5A1 arms not quantified\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Identified upstream control of CAPNS1 protein abundance by the ubiquitin-like protein FAT10, which stabilizes CAPNS1 to support colorectal cancer growth and invasion.\",\n      \"evidence\": \"FAT10 overexpression/knockdown with CAPNS1 ubiquitination assay and proliferation/invasion readouts\",\n      \"pmids\": [\"37310562\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of FAT10-dependent stabilization not detailed\", \"Single-lab finding\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Established a human disease link by showing biallelic loss-of-function CAPNS1 variants abolishing protein cause pulmonary arterial hypertension.\",\n      \"evidence\": \"Exome sequencing, splicing and western-blot protein-absence validation in two consanguineous families, and lung RNA-seq\",\n      \"pmids\": [\"38230350\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism linking calpain loss to pulmonary vascular disease not defined\", \"Only two families; no functional rescue\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how a regulatory protease subunit reconciles its many context-specific roles — direct enzymatic substrates versus scaffold/stabilizing functions — and which calpain cleavage events causally explain each tissue phenotype.\",\n      \"evidence\": \"No single study in the corpus integrates substrate-level mechanisms across the cardiac, immune, skeletal, DNA-repair, and oncogenic contexts\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Several substrate-stabilization claims lack a clear protease-based mechanism\", \"No structural model of CAPNS1 in any partner complex\", \"Tissue-specific substrate repertoires undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [0, 8, 12]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 1, 12]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [4, 10]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [8, 18]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0000228\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [5, 7]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [6, 17, 18, 19]},\n      {\"term_id\": \"R-HSA-73894\", \"supporting_discovery_ids\": [7]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [9, 10, 13, 16]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [7, 13, 15]}\n    ],\n    \"complexes\": [\"calpain heterodimer (calpain-1/CAPNS1, calpain-2/CAPNS1)\"],\n    \"partners\": [\"CAPN1\", \"CAPN2\", \"PTH1R\", \"FAK\", \"CNOT3\", \"USP1\", \"CTNNB1\", \"JUN\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":8,"faith_total":8,"faith_pct":100.0}}