{"gene":"NCALD","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2001,"finding":"Human NCALD encodes a 22 kDa neurocalcin delta protein with 100% and 99% amino acid identity to bovine and chicken neurocalcin, respectively; the gene is most abundantly expressed in brain, testis, ovary, and small intestine, and maps to chromosome 8 between markers D8S270 and D8S257.","method":"cDNA cloning from human fetal brain library, Northern blot, tissue in situ hybridization, radiation hybrid panel mapping","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (cloning, Northern blot, in situ hybridization, chromosomal mapping) in a single characterization study establishing basic gene identity and expression","pmids":["11267673"],"is_preprint":false},{"year":2019,"finding":"Reduction of NCALD (neurocalcin delta) expression by >70% via antisense oligonucleotide (Ncald-ASO3) administered intracerebroventricularly in a severe SMA mouse model significantly ameliorated SMA pathology, including electrophysiological and histological properties of neuromuscular junctions, muscle integrity, and motor deficits, demonstrating NCALD acts as a disease modifier of spinal muscular atrophy independent of SMN.","method":"ASO-mediated knockdown in SMA mouse model, randomized-blinded preclinical study, electrophysiology, histology, motor behavioral assays","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous randomized-blinded in vivo study with multiple orthogonal readouts (electrophysiology, histology, behavioral endpoints) and defined dose-response in a disease model","pmids":["31230718"],"is_preprint":false},{"year":2021,"finding":"NCALD promotes neuroinflammation by activating the IKK/IκBα/NF-κB signaling pathway in hippocampus; silencing NCALD reduced p-IKKβ, p-IκBα, and nuclear NF-κB p65, and decreased pro-inflammatory cytokines (IL-1β, IL-6, TNF-α, COX-2, iNOS), while NCALD overexpression reversed these effects.","method":"AAV-mediated NCALD silencing and overexpression in CUMS rat model, western blotting of cytoplasmic/nuclear fractions, ELISA for cytokines, rescue experiments","journal":"International immunopharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo knockdown/overexpression with rescue experiment and multiple orthogonal biochemical readouts in a single lab","pmids":["33578182"],"is_preprint":false},{"year":2021,"finding":"NCALD activates the sGC/cGMP/PKG signaling pathway in hippocampus; silencing NCALD reduced sGCα1, sGCβ1, PKG1/2, cGMP, and cleaved caspase-3, while NCALD overexpression via AAV reversed these reductions and re-induced apoptosis and depressive-like behavior. NOTE: This paper (PMID 34931140) was subsequently retracted (PMID 37886331).","method":"AAV-mediated NCALD silencing and overexpression in CUMS rat model, western blotting, ELISA for cGMP, behavioral tests — RETRACTED","journal":"Journal of healthcare engineering","confidence":"Low","confidence_rationale":"Tier 3 / Weak — paper was formally retracted; findings cannot be relied upon","pmids":["34931140","37886331"],"is_preprint":false},{"year":2025,"finding":"Silencing NCALD by intracerebroventricular AAV-si-NCALD in CUMS rats reduced hippocampal cleaved caspase-3, inhibited abnormal sGC/cGMP/PKG pathway activation, and improved depressive-like behaviors; NCALD overexpression abolished the antidepressant effects of helicid, placing NCALD upstream of sGC/cGMP/PKG-mediated hippocampal apoptosis.","method":"AAV-mediated NCALD silencing and overexpression in CUMS rat model, intracerebroventricular injection, western blotting, ELISA, behavioral assays (sucrose preference, open field test)","journal":"Nan fang yi ke da xue xue bao","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo gain- and loss-of-function with rescue, multiple biochemical endpoints; single lab but replicates and extends the pathway placement with orthogonal methods","pmids":["41429623"],"is_preprint":false},{"year":2024,"finding":"NCALD protein binds insulin in a metal ion-independent manner, and Ca2+ abolishes this interaction — in contrast to NCS-1, where Ca2+ enhances insulin binding — demonstrating differential Ca2+-dependent regulation of insulin interaction among NCS family members.","method":"Biophysical methods: fluorescence spectroscopy, circular dichroism, size exclusion chromatography, analytical ultracentrifugation","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 1 / Weak — in vitro biophysical characterization with multiple orthogonal methods but only a preprint with no peer review and no cellular/functional validation of this interaction","pmids":["bio_10.1101_2024.07.26.605271"],"is_preprint":true}],"current_model":"NCALD (neurocalcin delta) is a 22 kDa neuronal calcium sensor protein that acts as a disease modifier of spinal muscular atrophy (SMA) — its reduction via antisense oligonucleotides ameliorates SMA pathology at neuromuscular junctions in mice — and in the hippocampus it promotes neuroinflammation through the IKK/IκBα/NF-κB pathway and apoptosis through the sGC/cGMP/PKG pathway, with loss-of-function experiments placing NCALD upstream of both cascades; biophysical data further indicate that NCALD can bind insulin in a Ca2+-inhibited manner, though the functional significance of this interaction remains unvalidated."},"narrative":{"mechanistic_narrative":"NCALD (neurocalcin delta) is a 22 kDa neuronal calcium sensor protein, expressed most abundantly in brain and identified by cloning of the human gene with near-complete conservation to bovine and chicken orthologs [PMID:11267673]. Its best-defined biological role is as an SMN-independent disease modifier of spinal muscular atrophy: antisense oligonucleotide-mediated reduction of NCALD by >70% in a severe SMA mouse model ameliorates neuromuscular junction electrophysiology and histology, muscle integrity, and motor deficits [PMID:31230718]. In the hippocampus, loss- and gain-of-function studies place NCALD upstream of pro-inflammatory IKK/IκBα/NF-κB signaling, where silencing reduces p-IKKβ, p-IκBα, and nuclear NF-κB p65 along with downstream cytokines (IL-1β, IL-6, TNF-α, COX-2, iNOS) [PMID:33578182]. Beyond these roles, the molecular activity of NCALD as a calcium sensor and its direct effector partners have not been mechanistically resolved in the available corpus.","teleology":[{"year":2001,"claim":"Established the identity, tissue distribution, and chromosomal location of human NCALD, defining it as a highly conserved 22 kDa neurocalcin delta protein and providing the molecular entry point for all later functional work.","evidence":"cDNA cloning from human fetal brain library with Northern blot, in situ hybridization, and radiation hybrid mapping","pmids":["11267673"],"confidence":"Medium","gaps":["No biochemical demonstration of calcium-sensing activity","No interaction partners or downstream effectors identified","Subcellular localization not resolved"]},{"year":2019,"claim":"Answered whether NCALD has therapeutic relevance in disease by showing its reduction rescues SMA pathology independent of SMN, defining NCALD as a bona fide disease modifier and a tractable target.","evidence":"ASO-mediated knockdown in a severe SMA mouse model with randomized-blinded electrophysiology, histology, and motor behavioral readouts","pmids":["31230718"],"confidence":"High","gaps":["Molecular mechanism by which NCALD reduction protects the neuromuscular junction is not defined","No direct NCALD effector linking it to SMA pathology identified","Whether the protective effect depends on NCALD calcium-sensing activity is untested"]},{"year":2021,"claim":"Addressed how NCALD influences hippocampal pathology by placing it upstream of the IKK/IκBα/NF-κB cascade that drives neuroinflammation, linking NCALD level to pro-inflammatory cytokine output.","evidence":"AAV-mediated silencing and overexpression with rescue in a CUMS rat model, with fractionated western blotting and cytokine ELISA","pmids":["33578182"],"confidence":"Medium","gaps":["Direct molecular link between NCALD and IKK activation not demonstrated","Single-lab model; not independently replicated","Mechanism of NCALD-dependent pathway engagement unknown"]},{"year":2025,"claim":"Tested whether NCALD controls hippocampal apoptosis and depressive behavior via sGC/cGMP/PKG signaling, placing NCALD upstream of caspase-3-mediated apoptosis and showing its overexpression abolishes antidepressant drug effects.","evidence":"AAV-mediated silencing and overexpression with rescue in a CUMS rat model, western blotting, cGMP ELISA, and behavioral assays","pmids":["41429623"],"confidence":"Medium","gaps":["Direct biochemical connection between NCALD and sGC remains undefined","Single-lab finding in one disease model","Relationship between the NF-κB and sGC/cGMP/PKG branches not integrated"]},{"year":2024,"claim":"Probed the biochemical behavior of NCALD as a calcium sensor by showing it binds insulin in a Ca2+-inhibited manner, distinguishing it from the Ca2+-enhanced binding of the related sensor NCS-1.","evidence":"In vitro biophysical characterization (fluorescence spectroscopy, circular dichroism, size exclusion chromatography, analytical ultracentrifugation) (preprint)","pmids":["bio_10.1101_2024.07.26.605271"],"confidence":"Low","gaps":["Preprint without peer review","No cellular or functional validation of the insulin interaction","Physiological significance of Ca2+-dependent insulin binding unknown"]},{"year":null,"claim":"The core molecular function of NCALD as a calcium sensor — its direct effector targets and the mechanism connecting its calcium-binding to SMA, neuroinflammation, and apoptosis phenotypes — remains unresolved.","evidence":"No timeline discovery defines a direct NCALD effector or structural mechanism linking calcium sensing to downstream signaling","pmids":[],"confidence":"Low","gaps":["No direct molecular partner or substrate established","No structural model of calcium-dependent conformational switching","Mechanistic unity across SMA, inflammation, and apoptosis phenotypes not demonstrated"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[0]}],"localization":[],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[2]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P61601","full_name":"Neurocalcin-delta","aliases":[],"length_aa":193,"mass_kda":22.2,"function":"May be involved in the calcium-dependent regulation of rhodopsin phosphorylation. Binds three calcium ions","subcellular_location":"","url":"https://www.uniprot.org/uniprotkb/P61601/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NCALD","classification":"Not Classified","n_dependent_lines":6,"n_total_lines":1208,"dependency_fraction":0.004966887417218543},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/NCALD","total_profiled":1310},"omim":[{"mim_id":"606722","title":"NEUROCALCIN, DELTA; NCALD","url":"https://www.omim.org/entry/606722"},{"mim_id":"253400","title":"SPINAL MUSCULAR ATROPHY, TYPE III; SMA3","url":"https://www.omim.org/entry/253400"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"brain","ntpm":113.1},{"tissue":"salivary gland","ntpm":94.5}],"url":"https://www.proteinatlas.org/search/NCALD"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"P61601","domains":[{"cath_id":"1.10.238.10","chopping":"10-93","consensus_level":"high","plddt":91.6815,"start":10,"end":93},{"cath_id":"1.10.238.10","chopping":"97-186","consensus_level":"high","plddt":87.2071,"start":97,"end":186}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P61601","model_url":"https://alphafold.ebi.ac.uk/files/AF-P61601-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P61601-F1-predicted_aligned_error_v6.png","plddt_mean":86.31},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NCALD","jax_strain_url":"https://www.jax.org/strain/search?query=NCALD"},"sequence":{"accession":"P61601","fasta_url":"https://rest.uniprot.org/uniprotkb/P61601.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P61601/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P61601"}},"corpus_meta":[{"pmid":"27027352","id":"PMC_27027352","title":"Upregulation of long intergenic noncoding RNA 00673 promotes tumor proliferation via LSD1 interaction and repression of NCALD in non-small-cell lung cancer.","date":"2016","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/27027352","citation_count":68,"is_preprint":false},{"pmid":"35014676","id":"PMC_35014676","title":"N6‑methyladenosine upregulates miR‑181d‑5p in exosomes derived from cancer‑associated fibroblasts to inhibit 5‑FU sensitivity by targeting NCALD in colorectal cancer.","date":"2022","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/35014676","citation_count":63,"is_preprint":false},{"pmid":"33578182","id":"PMC_33578182","title":"Antidepressant-like effects of helicid on a chronic unpredictable mild stress-induced depression rat model: Inhibiting the IKK/IκBα/NF-κB pathway through NCALD to reduce inflammation.","date":"2021","source":"International immunopharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/33578182","citation_count":33,"is_preprint":false},{"pmid":"31230718","id":"PMC_31230718","title":"NCALD Antisense Oligonucleotide Therapy in Addition to Nusinersen further Ameliorates Spinal Muscular Atrophy in Mice.","date":"2019","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31230718","citation_count":28,"is_preprint":false},{"pmid":"11267673","id":"PMC_11267673","title":"Molecular cloning, mapping and characterization of the human neurocalcin delta gene (NCALD).","date":"2001","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/11267673","citation_count":24,"is_preprint":false},{"pmid":"37770991","id":"PMC_37770991","title":"Long non-coding RNA MIDEAS-AS1 inhibits growth and metastasis of triple-negative breast cancer via transcriptionally activating NCALD.","date":"2023","source":"Breast cancer research : BCR","url":"https://pubmed.ncbi.nlm.nih.gov/37770991","citation_count":6,"is_preprint":false},{"pmid":"38291441","id":"PMC_38291441","title":"An estrogen-regulated long non-coding RNA NCALD promotes luminal breast cancer proliferation by activating GRHL2.","date":"2024","source":"Cancer cell international","url":"https://pubmed.ncbi.nlm.nih.gov/38291441","citation_count":3,"is_preprint":false},{"pmid":"34931140","id":"PMC_34931140","title":"Helicid Reverses the Effect of Overexpressing NCALD, Which Blocks the sGC/cGMP/PKG Signaling Pathway in the CUMS-Induced Rat Model.","date":"2021","source":"Journal of healthcare engineering","url":"https://pubmed.ncbi.nlm.nih.gov/34931140","citation_count":3,"is_preprint":false},{"pmid":"36444691","id":"PMC_36444691","title":"NCALD as a potential predictive biomarker for the efficacy of platinum-based chemotherapy in ovarian cancer.","date":"2022","source":"Biomarkers in medicine","url":"https://pubmed.ncbi.nlm.nih.gov/36444691","citation_count":1,"is_preprint":false},{"pmid":"37886331","id":"PMC_37886331","title":"Retracted: Helicid Reverses the Effect of Overexpressing NCALD, Which Blocks the sGC/cGMP/PKG Signaling Pathway in the CUMS-Induced Rat Model.","date":"2023","source":"Journal of healthcare engineering","url":"https://pubmed.ncbi.nlm.nih.gov/37886331","citation_count":1,"is_preprint":false},{"pmid":"41429623","id":"PMC_41429623","title":"[Helicid alleviates depression-like behavior in rats with chronic unpredictable mild stress through the NCALD/sGC/cGMP/PKG axis].","date":"2025","source":"Nan fang yi ke da xue xue bao = Journal of Southern Medical University","url":"https://pubmed.ncbi.nlm.nih.gov/41429623","citation_count":0,"is_preprint":false},{"pmid":"40576135","id":"PMC_40576135","title":"[Retracted] N6‑methyladenosine upregulates miR‑181d‑5p in exosomes derived from cancer‑associated fibroblasts to inhibit 5‑FU sensitivity by targeting NCALD in colorectal cancer.","date":"2025","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/40576135","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.07.26.605271","title":"Insight into the Interaction between Neuronal Calcium Sensors and Insulin","date":"2024-07-26","source":"bioRxiv","url":"https://doi.org/10.1101/2024.07.26.605271","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":8605,"output_tokens":1746,"usd":0.026003,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8632,"output_tokens":2163,"usd":0.048618,"stage2_stop_reason":"end_turn"},"total_usd":0.074621,"stage1_batch_id":"msgbatch_013a8chtv3AWyTqv4z4sEF4C","stage2_batch_id":"msgbatch_01AHsuW63vinsvuTgzmQ3n62","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2001,\n      \"finding\": \"Human NCALD encodes a 22 kDa neurocalcin delta protein with 100% and 99% amino acid identity to bovine and chicken neurocalcin, respectively; the gene is most abundantly expressed in brain, testis, ovary, and small intestine, and maps to chromosome 8 between markers D8S270 and D8S257.\",\n      \"method\": \"cDNA cloning from human fetal brain library, Northern blot, tissue in situ hybridization, radiation hybrid panel mapping\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (cloning, Northern blot, in situ hybridization, chromosomal mapping) in a single characterization study establishing basic gene identity and expression\",\n      \"pmids\": [\"11267673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Reduction of NCALD (neurocalcin delta) expression by >70% via antisense oligonucleotide (Ncald-ASO3) administered intracerebroventricularly in a severe SMA mouse model significantly ameliorated SMA pathology, including electrophysiological and histological properties of neuromuscular junctions, muscle integrity, and motor deficits, demonstrating NCALD acts as a disease modifier of spinal muscular atrophy independent of SMN.\",\n      \"method\": \"ASO-mediated knockdown in SMA mouse model, randomized-blinded preclinical study, electrophysiology, histology, motor behavioral assays\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous randomized-blinded in vivo study with multiple orthogonal readouts (electrophysiology, histology, behavioral endpoints) and defined dose-response in a disease model\",\n      \"pmids\": [\"31230718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NCALD promotes neuroinflammation by activating the IKK/IκBα/NF-κB signaling pathway in hippocampus; silencing NCALD reduced p-IKKβ, p-IκBα, and nuclear NF-κB p65, and decreased pro-inflammatory cytokines (IL-1β, IL-6, TNF-α, COX-2, iNOS), while NCALD overexpression reversed these effects.\",\n      \"method\": \"AAV-mediated NCALD silencing and overexpression in CUMS rat model, western blotting of cytoplasmic/nuclear fractions, ELISA for cytokines, rescue experiments\",\n      \"journal\": \"International immunopharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo knockdown/overexpression with rescue experiment and multiple orthogonal biochemical readouts in a single lab\",\n      \"pmids\": [\"33578182\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"NCALD activates the sGC/cGMP/PKG signaling pathway in hippocampus; silencing NCALD reduced sGCα1, sGCβ1, PKG1/2, cGMP, and cleaved caspase-3, while NCALD overexpression via AAV reversed these reductions and re-induced apoptosis and depressive-like behavior. NOTE: This paper (PMID 34931140) was subsequently retracted (PMID 37886331).\",\n      \"method\": \"AAV-mediated NCALD silencing and overexpression in CUMS rat model, western blotting, ELISA for cGMP, behavioral tests — RETRACTED\",\n      \"journal\": \"Journal of healthcare engineering\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — paper was formally retracted; findings cannot be relied upon\",\n      \"pmids\": [\"34931140\", \"37886331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Silencing NCALD by intracerebroventricular AAV-si-NCALD in CUMS rats reduced hippocampal cleaved caspase-3, inhibited abnormal sGC/cGMP/PKG pathway activation, and improved depressive-like behaviors; NCALD overexpression abolished the antidepressant effects of helicid, placing NCALD upstream of sGC/cGMP/PKG-mediated hippocampal apoptosis.\",\n      \"method\": \"AAV-mediated NCALD silencing and overexpression in CUMS rat model, intracerebroventricular injection, western blotting, ELISA, behavioral assays (sucrose preference, open field test)\",\n      \"journal\": \"Nan fang yi ke da xue xue bao\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo gain- and loss-of-function with rescue, multiple biochemical endpoints; single lab but replicates and extends the pathway placement with orthogonal methods\",\n      \"pmids\": [\"41429623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"NCALD protein binds insulin in a metal ion-independent manner, and Ca2+ abolishes this interaction — in contrast to NCS-1, where Ca2+ enhances insulin binding — demonstrating differential Ca2+-dependent regulation of insulin interaction among NCS family members.\",\n      \"method\": \"Biophysical methods: fluorescence spectroscopy, circular dichroism, size exclusion chromatography, analytical ultracentrifugation\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro biophysical characterization with multiple orthogonal methods but only a preprint with no peer review and no cellular/functional validation of this interaction\",\n      \"pmids\": [\"bio_10.1101_2024.07.26.605271\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"NCALD (neurocalcin delta) is a 22 kDa neuronal calcium sensor protein that acts as a disease modifier of spinal muscular atrophy (SMA) — its reduction via antisense oligonucleotides ameliorates SMA pathology at neuromuscular junctions in mice — and in the hippocampus it promotes neuroinflammation through the IKK/IκBα/NF-κB pathway and apoptosis through the sGC/cGMP/PKG pathway, with loss-of-function experiments placing NCALD upstream of both cascades; biophysical data further indicate that NCALD can bind insulin in a Ca2+-inhibited manner, though the functional significance of this interaction remains unvalidated.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NCALD (neurocalcin delta) is a 22 kDa neuronal calcium sensor protein, expressed most abundantly in brain and identified by cloning of the human gene with near-complete conservation to bovine and chicken orthologs [#0]. Its best-defined biological role is as an SMN-independent disease modifier of spinal muscular atrophy: antisense oligonucleotide-mediated reduction of NCALD by >70% in a severe SMA mouse model ameliorates neuromuscular junction electrophysiology and histology, muscle integrity, and motor deficits [#1]. In the hippocampus, loss- and gain-of-function studies place NCALD upstream of pro-inflammatory IKK/IκBα/NF-κB signaling, where silencing reduces p-IKKβ, p-IκBα, and nuclear NF-κB p65 along with downstream cytokines (IL-1β, IL-6, TNF-α, COX-2, iNOS) [#2]. Beyond these roles, the molecular activity of NCALD as a calcium sensor and its direct effector partners have not been mechanistically resolved in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established the identity, tissue distribution, and chromosomal location of human NCALD, defining it as a highly conserved 22 kDa neurocalcin delta protein and providing the molecular entry point for all later functional work.\",\n      \"evidence\": \"cDNA cloning from human fetal brain library with Northern blot, in situ hybridization, and radiation hybrid mapping\",\n      \"pmids\": [\"11267673\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"No biochemical demonstration of calcium-sensing activity\",\n        \"No interaction partners or downstream effectors identified\",\n        \"Subcellular localization not resolved\"\n      ]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Answered whether NCALD has therapeutic relevance in disease by showing its reduction rescues SMA pathology independent of SMN, defining NCALD as a bona fide disease modifier and a tractable target.\",\n      \"evidence\": \"ASO-mediated knockdown in a severe SMA mouse model with randomized-blinded electrophysiology, histology, and motor behavioral readouts\",\n      \"pmids\": [\"31230718\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Molecular mechanism by which NCALD reduction protects the neuromuscular junction is not defined\",\n        \"No direct NCALD effector linking it to SMA pathology identified\",\n        \"Whether the protective effect depends on NCALD calcium-sensing activity is untested\"\n      ]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Addressed how NCALD influences hippocampal pathology by placing it upstream of the IKK/IκBα/NF-κB cascade that drives neuroinflammation, linking NCALD level to pro-inflammatory cytokine output.\",\n      \"evidence\": \"AAV-mediated silencing and overexpression with rescue in a CUMS rat model, with fractionated western blotting and cytokine ELISA\",\n      \"pmids\": [\"33578182\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct molecular link between NCALD and IKK activation not demonstrated\",\n        \"Single-lab model; not independently replicated\",\n        \"Mechanism of NCALD-dependent pathway engagement unknown\"\n      ]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Tested whether NCALD controls hippocampal apoptosis and depressive behavior via sGC/cGMP/PKG signaling, placing NCALD upstream of caspase-3-mediated apoptosis and showing its overexpression abolishes antidepressant drug effects.\",\n      \"evidence\": \"AAV-mediated silencing and overexpression with rescue in a CUMS rat model, western blotting, cGMP ELISA, and behavioral assays\",\n      \"pmids\": [\"41429623\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Direct biochemical connection between NCALD and sGC remains undefined\",\n        \"Single-lab finding in one disease model\",\n        \"Relationship between the NF-κB and sGC/cGMP/PKG branches not integrated\"\n      ]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Probed the biochemical behavior of NCALD as a calcium sensor by showing it binds insulin in a Ca2+-inhibited manner, distinguishing it from the Ca2+-enhanced binding of the related sensor NCS-1.\",\n      \"evidence\": \"In vitro biophysical characterization (fluorescence spectroscopy, circular dichroism, size exclusion chromatography, analytical ultracentrifugation) (preprint)\",\n      \"pmids\": [\"bio_10.1101_2024.07.26.605271\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"Preprint without peer review\",\n        \"No cellular or functional validation of the insulin interaction\",\n        \"Physiological significance of Ca2+-dependent insulin binding unknown\"\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The core molecular function of NCALD as a calcium sensor — its direct effector targets and the mechanism connecting its calcium-binding to SMA, neuroinflammation, and apoptosis phenotypes — remains unresolved.\",\n      \"evidence\": \"No timeline discovery defines a direct NCALD effector or structural mechanism linking calcium sensing to downstream signaling\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No direct molecular partner or substrate established\",\n        \"No structural model of calcium-dependent conformational switching\",\n        \"Mechanistic unity across SMA, inflammation, and apoptosis phenotypes not demonstrated\"\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":2,"faith_total":3,"faith_pct":66.66666666666667}}