{"gene":"CIDEA","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":1998,"finding":"CIDEA activates apoptosis in mammalian cells and induces DNA fragmentation; this activity is inhibited by DFF45/ICAD. Mutant analysis showed the C-terminal region of CIDEA is necessary and sufficient for killing, while the N-terminal CIDE domain (homologous to DFF45) is required for DFF45-mediated inhibition of CIDEA.","method":"Ectopic expression in 293T cells, DNA fragmentation assay, domain deletion/mutant analysis, co-expression with DFF45","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct functional assay with mutagenesis defining necessary/sufficient domains, replicated with multiple constructs in a focused mechanistic study","pmids":["9564035"],"is_preprint":false},{"year":2003,"finding":"Cidea directly suppresses UCP1 activity in brown adipose tissue mitochondria, thereby regulating thermogenesis and lipolysis; Cidea-null mice have higher UCP1-dependent metabolic rate and are resistant to diet-induced obesity.","method":"Cidea-null mouse model (genetic knockout), metabolic rate measurements, cold tolerance assay, in vivo lipolysis, direct UCP1 activity assay","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic KO with defined metabolic phenotypes plus direct biochemical evidence of UCP1 suppression; foundational paper replicated by subsequent work","pmids":["12910269"],"is_preprint":false},{"year":2007,"finding":"CIDEA protein stability is regulated by ubiquitin-mediated proteasomal degradation. CIDEA is polyubiquitinated primarily at K23 in its N-terminal region; mutation of N-terminal lysine residues (N-5KA mutant) dramatically stabilizes the protein.","method":"Cycloheximide chase assay, proteasome inhibitor treatment, ubiquitination assay, site-directed mutagenesis of individual lysine residues","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro assay with systematic mutagenesis identifying K23 as major ubiquitination site, single lab with multiple orthogonal methods","pmids":["17711404"],"is_preprint":false},{"year":2007,"finding":"PPARα and PPARγ transcriptionally regulate Cidea expression in mouse liver through a shared proximal PPRE element (Cidea-PPRE1 at -680/-668) in the Cidea gene promoter.","method":"Transactivation assay, gel-shift (EMSA), chromatin immunoprecipitation (ChIP), luciferase reporter assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — three orthogonal methods (EMSA, ChIP, reporter assay) in a single focused study identifying the functional PPRE","pmids":["17462989"],"is_preprint":false},{"year":2008,"finding":"Cidea colocalizes with lipid droplets (not mitochondria as previously thought), co-localizing with perilipin. Cidea-GFP expression greatly enhances lipid droplet size in preadipocytes and COS cells, and RNAi depletion of Cidea elevates lipolysis in human adipocytes.","method":"Fluorescence microscopy/colocalization with perilipin, ectopic Cidea-GFP expression in preadipocytes and COS cells, RNAi knockdown with lipolysis assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct subcellular localization with functional consequence (lipolysis), multiple cell lines, replicated across labs","pmids":["18509062"],"is_preprint":false},{"year":2008,"finding":"Cidea forms a complex with the β subunit (but not α or γ subunit) of AMPK in the endoplasmic reticulum and promotes ubiquitin-dependent proteasomal degradation of the AMPK-β subunit, reducing AMPK protein levels and enzymatic activity in brown adipose tissue.","method":"Co-immunoprecipitation in vivo, subcellular colocalization, co-expression with AMPK subunits and stability assay, ubiquitination assay, Cidea-null adipocyte differentiation from MEFs/preadipocytes","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP identifying specific subunit interaction, ubiquitination assay, genetic KO validation, multiple cell models","pmids":["18480843"],"is_preprint":false},{"year":2008,"finding":"The corepressor RIP140 directly interacts with PGC-1α and suppresses its activity, which in turn represses CIDEA expression; conversely, PGC-1α induces CIDEA expression via estrogen-related receptor α (ERRα) and NRF-1 binding sites on the CIDEA promoter.","method":"Luciferase reporter/promoter assay, ectopic expression of RIP140 and PGC-1α, protein-protein interaction assay (direct interaction between RIP140 and PGC-1α), adipocyte lipid droplet imaging","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter assays with defined binding sites and direct protein interaction shown, single lab","pmids":["18794372"],"is_preprint":false},{"year":2008,"finding":"CIDEa redistributes from mitochondria to the nucleus during apoptosis induction in HeLa cells, as shown by immunocytochemistry and subcellular fractionation, suggesting mitochondrial sequestration of CIDEa with nuclear translocation promoting apoptosis.","method":"Immunocytochemistry, subcellular fractionation/Western blot, tetracycline-inducible expression system, camptothecin and valinomycin treatments","journal":"General physiology and biophysics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by immunocytochemistry and fractionation in multiple conditions, single lab","pmids":["18645223"],"is_preprint":false},{"year":2008,"finding":"TNF-α decreases CIDEA expression in human adipocytes via the JNK (c-Jun N-terminal kinase) MAP kinase pathway, and CIDEA depletion by RNAi stimulates lipolysis and increases TNF-α secretion by a post-transcriptional mechanism.","method":"RNAi knockdown in human adipocytes, lipolysis assay (glycerol release), TNF-α treatment with JNK pathway inhibitor, TNF-α secretion measurement","journal":"Diabetes","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNAi with functional readouts and pathway inhibitor, single lab","pmids":["15919794"],"is_preprint":false},{"year":2008,"finding":"TNF-α negatively regulates transcription of the human CIDEA gene through an NF-κB binding site at position -163/-151 in the CIDEA promoter; basal transcriptional activity is confined to the 97 bp immediately upstream of the TSS.","method":"Luciferase reporter assay with deletion constructs, EMSA, mutational analysis of NF-κB site, human adipocyte and 3T3-L1 transfection","journal":"International journal of obesity","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — EMSA plus reporter assays with site-specific mutations, single lab","pmids":["18607384"],"is_preprint":false},{"year":2009,"finding":"Acute cold exposure down-regulates CIDEA mRNA and protein in rat interscapular BAT via sympathetically activated β3-adrenoreceptors, as demonstrated by pharmacological blockade with propranolol and SR59230A.","method":"Cold exposure in vivo, pharmacological blockade (propranolol, SR59230A), norepinephrine turnover measurement, quantitative RT-PCR and Western blot","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo pharmacological intervention with receptor-selective antagonists, single lab","pmids":["19577538"],"is_preprint":false},{"year":2009,"finding":"The FSP27/CIDEC CIDE-C domain directly interacts with CIDEA; FSP27 protein levels are reduced by co-expression of CIDEA.","method":"Interaction assay (co-immunoprecipitation/pulldown), co-expression and Western blot, domain deletion constructs","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — interaction assay with deletion mapping, single lab, replicated finding of CIDE family interactions","pmids":["19843876"],"is_preprint":false},{"year":2010,"finding":"The carboxy-terminal 104 amino acids of human Cidea are necessary and sufficient for lipid droplet targeting and triglyceride shielding (inhibition of lipolysis), while the N-terminal domain is required for the formation of enlarged lipid droplets (not just clustering of small droplets).","method":"Expression of deletion constructs in 3T3-L1 and COS-1 cells, lipid droplet morphology imaging, triglyceride quantification, basal glycerol release assay","journal":"Journal of lipid research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — systematic domain deletion with multiple functional readouts (localization, triglyceride accumulation, lipolysis), single lab with orthogonal methods","pmids":["20810722"],"is_preprint":false},{"year":2010,"finding":"SREBP-1c directly mediates insulin-induced Cidea expression in hepatocytes by binding to a sterol-regulatory element (SRE) in the Cidea gene promoter; Cidea in turn mediates SREBP-1c-dependent lipid accumulation.","method":"Luciferase reporter assay, EMSA, ChIP, adenovirus-mediated SREBP-1c overexpression, hepatocytes from SREBP-1c-null mice, Cidea knockdown","journal":"The Biochemical journal","confidence":"High","confidence_rationale":"Tier 1 / Strong — three orthogonal methods (EMSA, ChIP, reporter) plus genetic null validation, single lab with rigorous controls","pmids":["20575761"],"is_preprint":false},{"year":2010,"finding":"Insulin decreases CIDEA expression in human adipocytes via a PI3K/Akt1/2-dependent pathway; CIDEA depletion by siRNA inhibits starvation-induced apoptosis similarly to insulin, identifying CIDEA as a pro-apoptotic effector downstream of Akt signaling in adipocytes.","method":"PI3K/Akt inhibitors, siRNA knockdown, apoptosis assay, adipocyte number quantification","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological and siRNA approaches with functional readouts, single lab","pmids":["20154362"],"is_preprint":false},{"year":2011,"finding":"Insulin regulates CIDEA expression via the PI3K/Akt1/2 pathway; specific knockdown of Akt1/2 (but not JNK or ERK) prevented insulin-induced downregulation of CIDEA and inhibition of apoptosis in human adipocytes.","method":"PI3K inhibitors (wortmannin, PI-103), Akt inhibitor (API-2), JNK inhibitor (SP600125), siRNA knockdown of Akt1/2, apoptosis assay","journal":"Journal of lipid research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — selective pharmacological and siRNA pathway dissection, single lab","pmids":["21636835"],"is_preprint":false},{"year":2011,"finding":"CIDEA physically interacts with liver X receptors (LXRs) in human white adipocytes and modulates their transcriptional activity; CIDEA localizes to both cytoplasm and nucleus in these cells.","method":"Bioinformatic identification of nuclear receptor binding motifs, protein-protein binding assay, transactivation assay, cell fractionation","journal":"FEBS letters","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — protein-protein binding assay plus transactivation with fractionation, single lab, two orthogonal methods","pmids":["21315073"],"is_preprint":false},{"year":2011,"finding":"FoxO1 mediates palmitic acid-induced upregulation of Cidea in pancreatic β-cells; suppression of FoxO1 inhibits palmitate-induced Cidea expression and apoptosis, identifying a FoxO1→Cidea pro-apoptotic axis in β-cells.","method":"FoxO1 siRNA knockdown, Cidea siRNA knockdown, palmitic acid treatment, apoptosis assay in β-cells","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — siRNA pathway epistasis with functional readout, single lab","pmids":["21945815"],"is_preprint":false},{"year":2012,"finding":"Cidea functions as a transcriptional coactivator of C/EBPβ in mammary epithelial cells; it physically interacts with C/EBPβ in the nucleus, promotes C/EBPβ binding to the Xdh (XOR) promoter, displaces HDAC1 from the promoter, and thereby induces XOR expression required for milk lipid secretion.","method":"Nuclear fractionation, co-immunoprecipitation of Cidea with C/EBPβ, ChIP for C/EBPβ and HDAC1 at Xdh promoter, Cidea-null mouse mammary gland phenotype, ectopic Cidea expression","journal":"Nature medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, ChIP, genetic KO phenotype, and ectopic expression all convergent in one study; multiple orthogonal methods","pmids":["22245780"],"is_preprint":false},{"year":2012,"finding":"Overexpression of Cidea in mouse liver increases hepatic lipid accumulation and large lipid droplet formation; Cidea deficiency reduces lipid accumulation in diet-induced obese and ob/ob mice. Cidea expression in hepatocytes is specifically induced by saturated fatty acids via SREBP1c.","method":"Adenovirus-mediated Cidea overexpression in mouse liver, Cidea-null mice on HFD and ob/ob background, Cidea knockdown in ob/ob livers, saturated FA treatment of hepatocytes, SREBP1c knockdown/overexpression","journal":"Hepatology","confidence":"High","confidence_rationale":"Tier 2 / Strong — gain-of-function and loss-of-function in vivo and in vitro with mechanistic pathway analysis, multiple models","pmids":["22278400"],"is_preprint":false},{"year":2014,"finding":"Cidea is required for lipid storage and sebum secretion in sebaceous glands; Cidea deficiency leads to smaller lipid droplets in sebocytes, reduced skin surface lipids (TAG and wax diesters), and impaired water repulsion/thermoregulation. Cidea overexpression in human SZ95 sebocytes increases lipid storage and large lipid droplet formation.","method":"Cidea-null mouse phenotyping, skin lipid analysis, sebocyte lipid droplet imaging, CIDEA overexpression in SZ95 cells","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO phenotype with overexpression rescue in human cells, single lab","pmids":["24636991"],"is_preprint":false},{"year":2015,"finding":"CIDEA promotes lipid droplet (LD) fusion via an amphipathic helix that embeds in the LD phospholipid monolayer and binds phosphatidic acid (PA). CIDEA forms trans-complexes at LD-LD contact sites through contributions of the N-terminal CIDE domain and a C-terminal dimerization region, and these complexes interact with cone-shaped PA to increase phospholipid barrier permeability and enable lipid transfer between droplets.","method":"Amphipathic helix mutagenesis, PA-binding assay (lipid overlay/liposome pulldown), LD fusion assay, live-cell imaging of LD-LD contacts, domain deletion constructs, reconstitution of fusion in cells","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with mutagenesis, lipid-binding assays, and live imaging; multiple orthogonal methods in single rigorous study","pmids":["26609809"],"is_preprint":false},{"year":2015,"finding":"Cidea overexpression in adipose tissues (aP2-hCidea transgenic mice) mechanistically promotes adipose tissue expandability and increases lipid droplet size in white fat; UCP1 activity is markedly suppressed in brown-fat mitochondria from these mice despite unchanged UCP1 protein levels, indicating Cidea indirectly inhibits UCP1 activity (not by reducing its expression), and the effect is not due to mitochondrial localization of Cidea.","method":"Transgenic mouse model (aP2-hCidea), isolated brown-fat mitochondria UCP1 activity assay, UCP1 protein quantification, adipose tissue histology, metabolic phenotyping","journal":"American journal of physiology. Endocrinology and metabolism","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct UCP1 activity assay in isolated mitochondria from transgenic mice plus in vivo metabolic phenotype; two labs (Cannon/Nedergaard group with Abreu-Vieira)","pmids":["27923808","26118629"],"is_preprint":false},{"year":2018,"finding":"CIDEA promotes hepatic lipid accumulation via SREBP1c-mediated transcriptional induction; acetaldehyde specifically induces Cidea expression through activation of the SRE element in the Cidea promoter, which is abolished by SREBP1c knockdown.","method":"Dual-luciferase reporter gene assay (SRE element), SREBP1c knockdown (siRNA), acetaldehyde treatment of AML12 cells","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay with siRNA pathway validation, single lab","pmids":["29352167"],"is_preprint":false},{"year":2019,"finding":"During adipocyte britening, CIDEA shuttles from lipid droplets to the nucleus via a bipartite nuclear localization signal in a concentration-dependent manner. In the nucleus, CIDEA specifically inhibits LXRα-mediated repression of the UCP1 enhancer and strengthens PPARγ binding to the UCP1 enhancer, thereby driving UCP1 transcription.","method":"CRISPR-Cas9nD10A knockout of CIDEA in primary human adipocytes, CIDEA re-expression rescue, live-cell nuclear localization imaging, ChIP for LXRα and PPARγ at UCP1 enhancer, transcriptome analysis","journal":"iScience","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR KO with rescue, nuclear translocation assay, and ChIP at specific enhancer; multiple orthogonal methods in one study","pmids":["31563853"],"is_preprint":false},{"year":2021,"finding":"ER stress increases Cidea mRNA levels (maintained partly by increased mRNA stability) and stabilizes CIDE-A protein (normally sensitive to proteasomal degradation); this is negatively regulated by ATF6. Elevated CIDE-A expression under ER stress accompanies increased cell death.","method":"Induction of acute ER stress in PCCL3 thyrocytes, mRNA stability assay, proteasome inhibitor treatment, ATF6 manipulation, comparison with chronic ER stress-adapted cells","journal":"JCI insight","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mRNA stability and protein stability assays with pathway manipulation (ATF6), single lab, multiple cell types examined","pmids":["33661766"],"is_preprint":false},{"year":2021,"finding":"CIDEA overexpression in esophageal squamous cell carcinoma cells triggers G1-phase arrest and caspase-dependent mitochondrial apoptosis through the JNK-p21/Bad pathway; JNK activation by CIDEA induces actin cytoskeletal disruption, IL-6 release, and decreased STAT3 phosphorylation, while CIDEA-mediated apoptotic cell death and p53 acetylation are JNK-independent.","method":"CIDEA ectopic expression in ESCC cells, in vivo tumorigenesis in nude mice, caspase assay, JNK pathway inhibition, flow cytometry cell cycle analysis","journal":"Frontiers in oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo gain-of-function with pathway analysis using inhibitors, single lab","pmids":["33614508"],"is_preprint":false},{"year":2022,"finding":"METTL16 upregulates CIDEA expression at the translational level in an m6A-dependent manner in hepatocytes; METTL16 overexpression increases CIDEA expression and lipogenic gene expression in HepG2 cells.","method":"m6A high-throughput sequencing, METTL16 overexpression and knockdown in HepG2 cells, qRT-PCR and Western blot","journal":"PeerJ","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, overexpression/knockdown without direct m6A site validation on CIDEA mRNA in this paper","pmids":["36518278"],"is_preprint":false},{"year":2022,"finding":"CIDEA inhibits AMPK activity in bovine mammary epithelial cells by suppressing AMPK phosphorylation, which enhances PPARγ expression and nuclear translocation of SREBP1, thereby increasing fatty acid and triglyceride synthesis.","method":"CIDEA overexpression and siRNA knockdown in bMECs, AMPK activity assay, PPARγ and SREBP1 expression and localization by Western blot/immunofluorescence, TAG quantification","journal":"Journal of agricultural and food chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain- and loss-of-function with mechanistic pathway readouts, single lab","pmids":["36040348"],"is_preprint":false},{"year":2023,"finding":"SENP2 increases CIDEA expression by desumoylating ERRα, which then acts in coordination with PGC-1α to activate CIDEA transcription in adipocytes; palmitate treatment increases both SENP2 and CIDEA expression, and ERRα or SENP2 knockdown eliminates palmitate-induced CIDEA upregulation.","method":"SENP2 overexpression in 3T3-L1 adipocytes, siRNA knockdown of SENP2 and ERRα, lipid droplet size measurement, palmitate treatment, qRT-PCR","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — SENP2 OE/KD and ERRα KD with functional readout, mechanistic desumoylation link established, single lab","pmids":["37748256"],"is_preprint":false},{"year":2023,"finding":"Egr-1 transcription factor regulates Cidea expression in a circadian-coupled manner in mouse liver; Egr-1 deletion disrupts the opposite rhythmic coupling of Egr-1 and Cidea, resulting in increased hepatic triglyceride accumulation and large lipid droplet formation.","method":"Egr-1 knockout mouse liver analysis, transcriptional rhythm profiling, lipid droplet and triglyceride quantification, light-induced circadian reset","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with defined transcriptional and metabolic phenotype, single lab","pmids":["36964140"],"is_preprint":false},{"year":2023,"finding":"DNMT3B maintains Cidea promoter methylation to suppress CIDEA expression; LPS-induced reduction of DNMT3B causes promoter hypomethylation of CIDEA, increasing SREBP-1c binding to the CIDEA promoter and activating its expression, promoting hepatic lipid accumulation.","method":"DNMT3B overexpression and knockdown in mice and hepatocytes, bisulfite sequencing of CIDEA promoter, CIDEA interference in vivo, lipid accumulation assay","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic manipulation of DNMT3B in vivo and in vitro with promoter methylation analysis and functional rescue, single lab","pmids":["37703946"],"is_preprint":false},{"year":2025,"finding":"In cochlear hair cells, Cidea expression is specifically induced by neomycin damage; Cidea knockout mice show reduced hair cell apoptosis from neomycin and noise exposure. CRISPR/SlugCas9-HF-mediated Cidea editing via AAV delivery significantly reduces hair cell loss.","method":"Cidea-null mouse model, neomycin and noise exposure in vivo, CRISPR/Cas9 AAV delivery, hair cell apoptosis quantification","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with phenotypic readout and in vivo CRISPR intervention, single lab, single study","pmids":["41262044"],"is_preprint":false}],"current_model":"CIDEA is a multifunctional CIDE-domain protein that localizes primarily to lipid droplets (via its C-terminal domain) where it promotes lipid droplet fusion through PA-binding amphipathic helix-mediated trans-complexes, inhibits lipolysis, and regulates triglyceride storage; it also translocates to the nucleus to act as a transcriptional coactivator of C/EBPβ (driving XOR/milk lipid secretion) and to modulate LXRα/PPARγ-dependent UCP1 transcription during thermogenic beiging; in brown adipose tissue it indirectly suppresses UCP1 activity and promotes AMPK-β ubiquitin-proteasomal degradation; its own stability is controlled by ubiquitination at K23 and proteasomal degradation, and its transcription is regulated by PPARα/γ, SREBP-1c, ERRα/SENP2/PGC-1α, RIP140, NF-κB (via TNF-α), and DNMT3B-mediated promoter methylation."},"narrative":{"mechanistic_narrative":"CIDEA is a CIDE-domain protein that governs cellular triglyceride storage by acting at lipid droplets while doubling as a nuclear transcriptional regulator of lipid and thermogenic gene programs [PMID:18509062, PMID:20810722, PMID:31563853]. At lipid droplets, where it colocalizes with perilipin, its C-terminal ~104 residues are necessary and sufficient for droplet targeting and for shielding stored triglyceride from lipolysis, whereas the N-terminal CIDE domain drives the formation of enlarged droplets [PMID:18509062, PMID:20810722]; mechanistically, CIDEA enlarges droplets by promoting lipid-droplet fusion through an amphipathic helix that embeds in the phospholipid monolayer and binds phosphatidic acid, forming trans-complexes at droplet-droplet contacts that permit directional lipid transfer [PMID:26609809]. CIDEA also shuttles between droplets and the nucleus: during adipocyte browning a bipartite nuclear localization signal drives concentration-dependent nuclear entry, where CIDEA relieves LXRα-mediated repression and strengthens PPARγ binding at the UCP1 enhancer to drive UCP1 transcription [PMID:31563853, PMID:21315073], and in mammary epithelium it acts as a transcriptional coactivator of C/EBPβ, displacing HDAC1 to induce XOR expression required for milk lipid secretion [PMID:22245780]. In brown fat CIDEA suppresses thermogenesis: knockout mice have elevated UCP1-dependent metabolic rate and resist diet-induced obesity, and CIDEA inhibits UCP1 activity indirectly without altering UCP1 protein levels [PMID:12910269, PMID:27923808, PMID:26118629], in part by complexing with the AMPK-β subunit in the ER and driving its ubiquitin-dependent degradation [PMID:18480843]. CIDEA expression is integrated by lipogenic and nuclear-receptor signaling — induced by PPARα/γ, by SREBP-1c downstream of insulin and saturated fatty acids, and by ERRα/PGC-1α/SENP2 — and repressed by TNF-α via NF-κB/JNK and by DNMT3B-mediated promoter methylation [PMID:17462989, PMID:20575761, PMID:22278400, PMID:37748256, PMID:18607384, PMID:37703946], while CIDEA protein is itself turned over by proteasomal degradation following polyubiquitination at K23 [PMID:17711404]. Independently of its lipid roles, CIDEA promotes apoptosis: its C-terminal region induces DNA fragmentation inhibitable by DFF45, and it functions as a pro-apoptotic effector in adipocytes, β-cells, and cochlear hair cells [PMID:9564035, PMID:20154362, PMID:41262044].","teleology":[{"year":1998,"claim":"Established CIDEA's first molecular activity by showing it could trigger programmed cell death, defining a two-domain architecture in which the C-terminus kills and the N-terminal CIDE domain confers DFF45 regulation.","evidence":"Ectopic expression in 293T cells with DNA fragmentation assays, domain deletion mutants, and DFF45 co-expression","pmids":["9564035"],"confidence":"High","gaps":["Did not establish the physiological context of apoptotic activity","No endogenous substrate or partner of the C-terminal killing domain identified"]},{"year":2003,"claim":"Connected CIDEA to whole-body energy metabolism by showing it restrains UCP1-dependent thermogenesis, recasting the apoptotic gene as a metabolic regulator.","evidence":"Cidea-null mouse with metabolic rate, cold tolerance, lipolysis measurements and direct UCP1 activity assay","pmids":["12910269"],"confidence":"High","gaps":["Mechanism by which CIDEA suppresses UCP1 not resolved","Did not address subcellular site of action"]},{"year":2007,"claim":"Defined how CIDEA protein abundance is controlled and how its transcription is wired to lipid-sensing nuclear receptors.","evidence":"CHX chase and ubiquitination assays with lysine mutagenesis (K23); EMSA/ChIP/reporter for PPARα/γ PPRE","pmids":["17711404","17462989"],"confidence":"High","gaps":["E3 ligase responsible for K23 ubiquitination not identified","Tissue specificity of PPRE usage not resolved"]},{"year":2008,"claim":"Relocated CIDEA's primary site of action to lipid droplets and revealed two distinct metabolic mechanisms: suppression of lipolysis at droplets and ER-based degradation of AMPK-β.","evidence":"Perilipin colocalization, Cidea-GFP overexpression and RNAi lipolysis assays; reciprocal Co-IP and ubiquitination assays with AMPK subunits plus Cidea-null cells","pmids":["18509062","18480843"],"confidence":"High","gaps":["Reconciliation of earlier mitochondrial localization claims incomplete","How CIDEA enlarges droplets mechanistically unresolved at this stage"]},{"year":2008,"claim":"Mapped upstream transcriptional and signaling control of CIDEA, including PGC-1α/ERRα activation, RIP140 corepression, and TNF-α suppression via NF-κB and JNK.","evidence":"Promoter reporter/EMSA assays, RIP140-PGC-1α interaction, RNAi with lipolysis and cytokine readouts, JNK inhibitor experiments in human adipocytes","pmids":["18794372","15919794","18607384"],"confidence":"Medium","gaps":["Single-lab promoter studies","Post-transcriptional component of TNF-α effect not molecularly defined"]},{"year":2008,"claim":"Documented apoptosis-associated nuclear redistribution of CIDEA, linking its localization to cell-death function.","evidence":"Immunocytochemistry and subcellular fractionation under apoptotic stimuli in HeLa cells","pmids":["18645223"],"confidence":"Medium","gaps":["Mechanism and signal driving translocation not defined","Single-lab localization study"]},{"year":2010,"claim":"Dissected CIDEA's domain logic at lipid droplets, separating C-terminal targeting/triglyceride shielding from N-terminal droplet enlargement, and tied hepatic CIDEA induction to the SREBP-1c/insulin axis.","evidence":"Deletion constructs with LD morphology and triglyceride/glycerol assays; EMSA/ChIP/reporter plus SREBP-1c-null hepatocytes; insulin-PI3K/Akt apoptosis studies","pmids":["20810722","20575761","20154362"],"confidence":"High","gaps":["Structural basis of N-terminal-mediated enlargement not yet shown","How insulin coordinately controls CIDEA in liver vs adipose not unified"]},{"year":2011,"claim":"Expanded CIDEA's regulatory inputs (FoxO1, Akt1/2) and revealed direct interaction with LXRs, foreshadowing a nuclear-receptor coactivator role.","evidence":"siRNA epistasis and pathway inhibitors in adipocytes and β-cells; protein-binding and transactivation assays with cell fractionation for LXR","pmids":["21636835","21945815","21315073"],"confidence":"Medium","gaps":["LXR interaction surface and direct binding not structurally mapped","Single-lab interaction assays"]},{"year":2012,"claim":"Demonstrated a bona fide nuclear transcriptional-coactivator function by showing CIDEA drives C/EBPβ-dependent XOR expression for milk lipid secretion.","evidence":"Nuclear Co-IP, ChIP for C/EBPβ and HDAC1 at Xdh promoter, Cidea-null mammary phenotype, and rescue","pmids":["22245780"],"confidence":"High","gaps":["How CIDEA partitions between droplet and nuclear pools not defined here","Generality of coactivator role across tissues unknown"]},{"year":2015,"claim":"Provided the biophysical mechanism of CIDEA-driven droplet enlargement and clarified that brown-fat UCP1 suppression is indirect rather than via mitochondrial CIDEA.","evidence":"Amphipathic-helix mutagenesis, PA-binding and LD fusion reconstitution with live imaging; aP2-hCidea transgenic mice with isolated-mitochondria UCP1 activity assays","pmids":["26609809","27923808","26118629"],"confidence":"High","gaps":["Molecular intermediary linking CIDEA to UCP1 activity inhibition still unidentified","Regulation of trans-complex assembly in vivo not defined"]},{"year":2019,"claim":"Resolved the droplet-to-nucleus shuttling mechanism and showed nuclear CIDEA promotes thermogenesis by remodeling LXRα/PPARγ occupancy at the UCP1 enhancer, an apparent counterpoint to its BAT UCP1-suppressing role.","evidence":"CRISPR knockout with rescue in primary human adipocytes, live-cell NLS imaging, and ChIP at the UCP1 enhancer","pmids":["31563853"],"confidence":"High","gaps":["Reconciliation of pro- and anti-thermogenic roles across depots not settled","Signals controlling concentration-dependent shuttling not defined"]},{"year":2023,"claim":"Layered additional transcriptional and epigenetic control (SENP2/ERRα/PGC-1α, Egr-1 circadian coupling, DNMT3B methylation) onto CIDEA regulation in metabolic tissues.","evidence":"SENP2/ERRα knockdown in adipocytes, Egr-1 knockout circadian liver profiling, DNMT3B manipulation with bisulfite sequencing and rescue","pmids":["37748256","36964140","37703946"],"confidence":"Medium","gaps":["Mostly single-lab studies","Integration of multiple inputs at a single promoter not modeled"]},{"year":2025,"claim":"Extended CIDEA's pro-apoptotic function to a new physiological context, showing it mediates damage-induced hair-cell death and that its editing protects against ototoxic loss.","evidence":"Cidea-null mice with neomycin/noise exposure and AAV-delivered CRISPR editing in cochlea","pmids":["41262044"],"confidence":"Medium","gaps":["Molecular pathway from CIDEA to hair-cell apoptosis not defined","Single study"]},{"year":null,"claim":"The central unresolved question is how CIDEA reconciles its opposing roles—lipid-droplet fusion/storage, depot-specific pro- and anti-thermogenic transcriptional effects, and pro-apoptotic activity—through a unified control of its localization, abundance, and partner choice.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model unifying droplet-binding and nuclear coactivator surfaces","Signals dictating droplet-vs-nucleus partitioning unknown","Direct effector linking CIDEA to UCP1 activity inhibition unidentified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0008289","term_label":"lipid binding","supporting_discovery_ids":[21]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[18,24]},{"term_id":"GO:0140313","term_label":"molecular sequestering activity","supporting_discovery_ids":[4,12]}],"localization":[{"term_id":"GO:0005811","term_label":"lipid droplet","supporting_discovery_ids":[4,12,21]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[18,24,16]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[5]}],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[4,12,19]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[18,24]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[0,14,32]}],"complexes":[],"partners":["PRKAB1","CEBPB","LXRA","PPARG","CIDEC","DFFA"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O60543","full_name":"Lipid transferase CIDEA","aliases":["Cell death activator CIDE-A","Cell death-inducing DFFA-like effector A"],"length_aa":219,"mass_kda":24.7,"function":"Lipid transferase that promotes unilocular lipid droplet formation by mediating lipid droplet fusion (PubMed:19843876, PubMed:26118629). Lipid droplet fusion promotes their enlargement, restricting lipolysis and favoring lipid storage (PubMed:19843876). Localizes on the lipid droplet surface, at focal contact sites between lipid droplets, and mediates atypical lipid droplet fusion by promoting directional net neutral lipid transfer from the smaller to larger lipid droplets (By similarity). The transfer direction may be driven by the internal pressure difference between the contacting lipid droplet pair and occurs at a lower rate than that promoted by CIDEC (By similarity). May also act as a CEBPB coactivator in epithelial cells to control the expression of a subset of CEBPB downstream target genes, including ID2, IGF1, PRLR, SOCS1, SOCS3, XDH, but not casein (By similarity). By interacting with CEBPB, strengthens the association of CEBPB with the XDH promoter, increases histone acetylation and dissociates HDAC1 from the promoter (By similarity). When overexpressed, induces apoptosis; the physiological significance of its role in apoptosis is unclear (By similarity)","subcellular_location":"Lipid droplet; Nucleus","url":"https://www.uniprot.org/uniprotkb/O60543/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CIDEA","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CIDEA","total_profiled":1310},"omim":[{"mim_id":"612120","title":"CELL DEATH-INDUCING DFFA-LIKE EFFECTOR C; CIDEC","url":"https://www.omim.org/entry/612120"},{"mim_id":"604441","title":"CELL DEATH-INDUCING DFFA-LIKE EFFECTOR B; CIDEB","url":"https://www.omim.org/entry/604441"},{"mim_id":"604440","title":"CELL DEATH-INDUCING DFFA-LIKE EFFECTOR A; CIDEA","url":"https://www.omim.org/entry/604440"},{"mim_id":"601882","title":"DNA FRAGMENTATION FACTOR, 45-KD, ALPHA SUBUNIT; DFFA","url":"https://www.omim.org/entry/601882"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Group enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adipose tissue","ntpm":207.5},{"tissue":"breast","ntpm":138.9}],"url":"https://www.proteinatlas.org/search/CIDEA"},"hgnc":{"alias_symbol":["CIDE-A"],"prev_symbol":[]},"alphafold":{"accession":"O60543","domains":[{"cath_id":"3.10.20.10","chopping":"36-104","consensus_level":"high","plddt":88.7717,"start":36,"end":104},{"cath_id":"-","chopping":"129-164","consensus_level":"high","plddt":81.8961,"start":129,"end":164},{"cath_id":"1.20.5","chopping":"167-198","consensus_level":"medium","plddt":93.3272,"start":167,"end":198}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60543","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60543-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60543-F1-predicted_aligned_error_v6.png","plddt_mean":75.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CIDEA","jax_strain_url":"https://www.jax.org/strain/search?query=CIDEA"},"sequence":{"accession":"O60543","fasta_url":"https://rest.uniprot.org/uniprotkb/O60543.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60543/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60543"}},"corpus_meta":[{"pmid":"12910269","id":"PMC_12910269","title":"Cidea-deficient 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research communications","url":"https://pubmed.ncbi.nlm.nih.gov/37748256","citation_count":3,"is_preprint":false},{"pmid":"34022192","id":"PMC_34022192","title":"In silico interactions of statins with cell death-inducing DNA fragmentation factor-like effector A (CIDEA).","date":"2021","source":"Chemico-biological interactions","url":"https://pubmed.ncbi.nlm.nih.gov/34022192","citation_count":3,"is_preprint":false},{"pmid":"29219006","id":"PMC_29219006","title":"Distribution and quantitative analysis of CIDEa and CIDEc in broiler chickens: accounting for differential fat deposition between strains.","date":"2017","source":"British poultry science","url":"https://pubmed.ncbi.nlm.nih.gov/29219006","citation_count":3,"is_preprint":false},{"pmid":"31028911","id":"PMC_31028911","title":"CIDEA and CIDEC are regulated by CREB and are not induced during fasting in grass carp Ctenopharyngodon idella adipocytes.","date":"2019","source":"Comparative biochemistry and physiology. Part B, Biochemistry & molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/31028911","citation_count":2,"is_preprint":false},{"pmid":"40305497","id":"PMC_40305497","title":"Comparative effect of high intensity interval training and moderate intensity continuous training on metabolic improvements and regulation of Cidea and Cidec in obese C57BL/6 mice.","date":"2025","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/40305497","citation_count":2,"is_preprint":false},{"pmid":"41262044","id":"PMC_41262044","title":"Cidea Targeting Protects Cochlear Hair Cells and Hearing Function From Drug- and Noise-Induced Damage.","date":"2025","source":"Advanced science (Weinheim, Baden-Wurttemberg, Germany)","url":"https://pubmed.ncbi.nlm.nih.gov/41262044","citation_count":1,"is_preprint":false},{"pmid":"34672413","id":"PMC_34672413","title":"CIDEA expression in SAT from adolescent girls with obesity and unfavorable patterns of abdominal fat distribution.","date":"2021","source":"Obesity (Silver Spring, Md.)","url":"https://pubmed.ncbi.nlm.nih.gov/34672413","citation_count":1,"is_preprint":false},{"pmid":"40867704","id":"PMC_40867704","title":"Activation of Focal Adhesion Pathway by CIDEA as Key Regulatory Axis in Lipid Deposition in Goat Intramuscular Precursor Adipocytes.","date":"2025","source":"Animals : an open access journal from MDPI","url":"https://pubmed.ncbi.nlm.nih.gov/40867704","citation_count":1,"is_preprint":false},{"pmid":"37076679","id":"PMC_37076679","title":"Use of CIDEA Reporter Mouse Model for Screening Thermogenic Fat-Activating Drugs.","date":"2023","source":"Methods in molecular biology (Clifton, N.J.)","url":"https://pubmed.ncbi.nlm.nih.gov/37076679","citation_count":0,"is_preprint":false},{"pmid":"35000670","id":"PMC_35000670","title":"Exercise-induced beige adipogenesis of iWAT in Cidea reporter mice.","date":"2022","source":"BMB reports","url":"https://pubmed.ncbi.nlm.nih.gov/35000670","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.09.22.613751","title":"The exit of naïve pluripotency contains a lipid metabolism-induced checkpoint for genome integrity","date":"2024-09-23","source":"bioRxiv","url":"https://doi.org/10.1101/2024.09.22.613751","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":32697,"output_tokens":7794,"usd":0.1075,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":17559,"output_tokens":4678,"usd":0.102373,"stage2_stop_reason":"end_turn"},"total_usd":0.209873,"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\": 1998,\n      \"finding\": \"CIDEA activates apoptosis in mammalian cells and induces DNA fragmentation; this activity is inhibited by DFF45/ICAD. Mutant analysis showed the C-terminal region of CIDEA is necessary and sufficient for killing, while the N-terminal CIDE domain (homologous to DFF45) is required for DFF45-mediated inhibition of CIDEA.\",\n      \"method\": \"Ectopic expression in 293T cells, DNA fragmentation assay, domain deletion/mutant analysis, co-expression with DFF45\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct functional assay with mutagenesis defining necessary/sufficient domains, replicated with multiple constructs in a focused mechanistic study\",\n      \"pmids\": [\"9564035\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Cidea directly suppresses UCP1 activity in brown adipose tissue mitochondria, thereby regulating thermogenesis and lipolysis; Cidea-null mice have higher UCP1-dependent metabolic rate and are resistant to diet-induced obesity.\",\n      \"method\": \"Cidea-null mouse model (genetic knockout), metabolic rate measurements, cold tolerance assay, in vivo lipolysis, direct UCP1 activity assay\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic KO with defined metabolic phenotypes plus direct biochemical evidence of UCP1 suppression; foundational paper replicated by subsequent work\",\n      \"pmids\": [\"12910269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"CIDEA protein stability is regulated by ubiquitin-mediated proteasomal degradation. CIDEA is polyubiquitinated primarily at K23 in its N-terminal region; mutation of N-terminal lysine residues (N-5KA mutant) dramatically stabilizes the protein.\",\n      \"method\": \"Cycloheximide chase assay, proteasome inhibitor treatment, ubiquitination assay, site-directed mutagenesis of individual lysine residues\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro assay with systematic mutagenesis identifying K23 as major ubiquitination site, single lab with multiple orthogonal methods\",\n      \"pmids\": [\"17711404\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PPARα and PPARγ transcriptionally regulate Cidea expression in mouse liver through a shared proximal PPRE element (Cidea-PPRE1 at -680/-668) in the Cidea gene promoter.\",\n      \"method\": \"Transactivation assay, gel-shift (EMSA), chromatin immunoprecipitation (ChIP), luciferase reporter assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — three orthogonal methods (EMSA, ChIP, reporter assay) in a single focused study identifying the functional PPRE\",\n      \"pmids\": [\"17462989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Cidea colocalizes with lipid droplets (not mitochondria as previously thought), co-localizing with perilipin. Cidea-GFP expression greatly enhances lipid droplet size in preadipocytes and COS cells, and RNAi depletion of Cidea elevates lipolysis in human adipocytes.\",\n      \"method\": \"Fluorescence microscopy/colocalization with perilipin, ectopic Cidea-GFP expression in preadipocytes and COS cells, RNAi knockdown with lipolysis assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct subcellular localization with functional consequence (lipolysis), multiple cell lines, replicated across labs\",\n      \"pmids\": [\"18509062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Cidea forms a complex with the β subunit (but not α or γ subunit) of AMPK in the endoplasmic reticulum and promotes ubiquitin-dependent proteasomal degradation of the AMPK-β subunit, reducing AMPK protein levels and enzymatic activity in brown adipose tissue.\",\n      \"method\": \"Co-immunoprecipitation in vivo, subcellular colocalization, co-expression with AMPK subunits and stability assay, ubiquitination assay, Cidea-null adipocyte differentiation from MEFs/preadipocytes\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP identifying specific subunit interaction, ubiquitination assay, genetic KO validation, multiple cell models\",\n      \"pmids\": [\"18480843\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The corepressor RIP140 directly interacts with PGC-1α and suppresses its activity, which in turn represses CIDEA expression; conversely, PGC-1α induces CIDEA expression via estrogen-related receptor α (ERRα) and NRF-1 binding sites on the CIDEA promoter.\",\n      \"method\": \"Luciferase reporter/promoter assay, ectopic expression of RIP140 and PGC-1α, protein-protein interaction assay (direct interaction between RIP140 and PGC-1α), adipocyte lipid droplet imaging\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter assays with defined binding sites and direct protein interaction shown, single lab\",\n      \"pmids\": [\"18794372\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"CIDEa redistributes from mitochondria to the nucleus during apoptosis induction in HeLa cells, as shown by immunocytochemistry and subcellular fractionation, suggesting mitochondrial sequestration of CIDEa with nuclear translocation promoting apoptosis.\",\n      \"method\": \"Immunocytochemistry, subcellular fractionation/Western blot, tetracycline-inducible expression system, camptothecin and valinomycin treatments\",\n      \"journal\": \"General physiology and biophysics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by immunocytochemistry and fractionation in multiple conditions, single lab\",\n      \"pmids\": [\"18645223\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TNF-α decreases CIDEA expression in human adipocytes via the JNK (c-Jun N-terminal kinase) MAP kinase pathway, and CIDEA depletion by RNAi stimulates lipolysis and increases TNF-α secretion by a post-transcriptional mechanism.\",\n      \"method\": \"RNAi knockdown in human adipocytes, lipolysis assay (glycerol release), TNF-α treatment with JNK pathway inhibitor, TNF-α secretion measurement\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNAi with functional readouts and pathway inhibitor, single lab\",\n      \"pmids\": [\"15919794\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"TNF-α negatively regulates transcription of the human CIDEA gene through an NF-κB binding site at position -163/-151 in the CIDEA promoter; basal transcriptional activity is confined to the 97 bp immediately upstream of the TSS.\",\n      \"method\": \"Luciferase reporter assay with deletion constructs, EMSA, mutational analysis of NF-κB site, human adipocyte and 3T3-L1 transfection\",\n      \"journal\": \"International journal of obesity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — EMSA plus reporter assays with site-specific mutations, single lab\",\n      \"pmids\": [\"18607384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Acute cold exposure down-regulates CIDEA mRNA and protein in rat interscapular BAT via sympathetically activated β3-adrenoreceptors, as demonstrated by pharmacological blockade with propranolol and SR59230A.\",\n      \"method\": \"Cold exposure in vivo, pharmacological blockade (propranolol, SR59230A), norepinephrine turnover measurement, quantitative RT-PCR and Western blot\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo pharmacological intervention with receptor-selective antagonists, single lab\",\n      \"pmids\": [\"19577538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The FSP27/CIDEC CIDE-C domain directly interacts with CIDEA; FSP27 protein levels are reduced by co-expression of CIDEA.\",\n      \"method\": \"Interaction assay (co-immunoprecipitation/pulldown), co-expression and Western blot, domain deletion constructs\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — interaction assay with deletion mapping, single lab, replicated finding of CIDE family interactions\",\n      \"pmids\": [\"19843876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The carboxy-terminal 104 amino acids of human Cidea are necessary and sufficient for lipid droplet targeting and triglyceride shielding (inhibition of lipolysis), while the N-terminal domain is required for the formation of enlarged lipid droplets (not just clustering of small droplets).\",\n      \"method\": \"Expression of deletion constructs in 3T3-L1 and COS-1 cells, lipid droplet morphology imaging, triglyceride quantification, basal glycerol release assay\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — systematic domain deletion with multiple functional readouts (localization, triglyceride accumulation, lipolysis), single lab with orthogonal methods\",\n      \"pmids\": [\"20810722\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SREBP-1c directly mediates insulin-induced Cidea expression in hepatocytes by binding to a sterol-regulatory element (SRE) in the Cidea gene promoter; Cidea in turn mediates SREBP-1c-dependent lipid accumulation.\",\n      \"method\": \"Luciferase reporter assay, EMSA, ChIP, adenovirus-mediated SREBP-1c overexpression, hepatocytes from SREBP-1c-null mice, Cidea knockdown\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — three orthogonal methods (EMSA, ChIP, reporter) plus genetic null validation, single lab with rigorous controls\",\n      \"pmids\": [\"20575761\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Insulin decreases CIDEA expression in human adipocytes via a PI3K/Akt1/2-dependent pathway; CIDEA depletion by siRNA inhibits starvation-induced apoptosis similarly to insulin, identifying CIDEA as a pro-apoptotic effector downstream of Akt signaling in adipocytes.\",\n      \"method\": \"PI3K/Akt inhibitors, siRNA knockdown, apoptosis assay, adipocyte number quantification\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological and siRNA approaches with functional readouts, single lab\",\n      \"pmids\": [\"20154362\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Insulin regulates CIDEA expression via the PI3K/Akt1/2 pathway; specific knockdown of Akt1/2 (but not JNK or ERK) prevented insulin-induced downregulation of CIDEA and inhibition of apoptosis in human adipocytes.\",\n      \"method\": \"PI3K inhibitors (wortmannin, PI-103), Akt inhibitor (API-2), JNK inhibitor (SP600125), siRNA knockdown of Akt1/2, apoptosis assay\",\n      \"journal\": \"Journal of lipid research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — selective pharmacological and siRNA pathway dissection, single lab\",\n      \"pmids\": [\"21636835\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"CIDEA physically interacts with liver X receptors (LXRs) in human white adipocytes and modulates their transcriptional activity; CIDEA localizes to both cytoplasm and nucleus in these cells.\",\n      \"method\": \"Bioinformatic identification of nuclear receptor binding motifs, protein-protein binding assay, transactivation assay, cell fractionation\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — protein-protein binding assay plus transactivation with fractionation, single lab, two orthogonal methods\",\n      \"pmids\": [\"21315073\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"FoxO1 mediates palmitic acid-induced upregulation of Cidea in pancreatic β-cells; suppression of FoxO1 inhibits palmitate-induced Cidea expression and apoptosis, identifying a FoxO1→Cidea pro-apoptotic axis in β-cells.\",\n      \"method\": \"FoxO1 siRNA knockdown, Cidea siRNA knockdown, palmitic acid treatment, apoptosis assay in β-cells\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — siRNA pathway epistasis with functional readout, single lab\",\n      \"pmids\": [\"21945815\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Cidea functions as a transcriptional coactivator of C/EBPβ in mammary epithelial cells; it physically interacts with C/EBPβ in the nucleus, promotes C/EBPβ binding to the Xdh (XOR) promoter, displaces HDAC1 from the promoter, and thereby induces XOR expression required for milk lipid secretion.\",\n      \"method\": \"Nuclear fractionation, co-immunoprecipitation of Cidea with C/EBPβ, ChIP for C/EBPβ and HDAC1 at Xdh promoter, Cidea-null mouse mammary gland phenotype, ectopic Cidea expression\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, ChIP, genetic KO phenotype, and ectopic expression all convergent in one study; multiple orthogonal methods\",\n      \"pmids\": [\"22245780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Overexpression of Cidea in mouse liver increases hepatic lipid accumulation and large lipid droplet formation; Cidea deficiency reduces lipid accumulation in diet-induced obese and ob/ob mice. Cidea expression in hepatocytes is specifically induced by saturated fatty acids via SREBP1c.\",\n      \"method\": \"Adenovirus-mediated Cidea overexpression in mouse liver, Cidea-null mice on HFD and ob/ob background, Cidea knockdown in ob/ob livers, saturated FA treatment of hepatocytes, SREBP1c knockdown/overexpression\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gain-of-function and loss-of-function in vivo and in vitro with mechanistic pathway analysis, multiple models\",\n      \"pmids\": [\"22278400\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cidea is required for lipid storage and sebum secretion in sebaceous glands; Cidea deficiency leads to smaller lipid droplets in sebocytes, reduced skin surface lipids (TAG and wax diesters), and impaired water repulsion/thermoregulation. Cidea overexpression in human SZ95 sebocytes increases lipid storage and large lipid droplet formation.\",\n      \"method\": \"Cidea-null mouse phenotyping, skin lipid analysis, sebocyte lipid droplet imaging, CIDEA overexpression in SZ95 cells\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO phenotype with overexpression rescue in human cells, single lab\",\n      \"pmids\": [\"24636991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"CIDEA promotes lipid droplet (LD) fusion via an amphipathic helix that embeds in the LD phospholipid monolayer and binds phosphatidic acid (PA). CIDEA forms trans-complexes at LD-LD contact sites through contributions of the N-terminal CIDE domain and a C-terminal dimerization region, and these complexes interact with cone-shaped PA to increase phospholipid barrier permeability and enable lipid transfer between droplets.\",\n      \"method\": \"Amphipathic helix mutagenesis, PA-binding assay (lipid overlay/liposome pulldown), LD fusion assay, live-cell imaging of LD-LD contacts, domain deletion constructs, reconstitution of fusion in cells\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with mutagenesis, lipid-binding assays, and live imaging; multiple orthogonal methods in single rigorous study\",\n      \"pmids\": [\"26609809\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Cidea overexpression in adipose tissues (aP2-hCidea transgenic mice) mechanistically promotes adipose tissue expandability and increases lipid droplet size in white fat; UCP1 activity is markedly suppressed in brown-fat mitochondria from these mice despite unchanged UCP1 protein levels, indicating Cidea indirectly inhibits UCP1 activity (not by reducing its expression), and the effect is not due to mitochondrial localization of Cidea.\",\n      \"method\": \"Transgenic mouse model (aP2-hCidea), isolated brown-fat mitochondria UCP1 activity assay, UCP1 protein quantification, adipose tissue histology, metabolic phenotyping\",\n      \"journal\": \"American journal of physiology. Endocrinology and metabolism\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct UCP1 activity assay in isolated mitochondria from transgenic mice plus in vivo metabolic phenotype; two labs (Cannon/Nedergaard group with Abreu-Vieira)\",\n      \"pmids\": [\"27923808\", \"26118629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CIDEA promotes hepatic lipid accumulation via SREBP1c-mediated transcriptional induction; acetaldehyde specifically induces Cidea expression through activation of the SRE element in the Cidea promoter, which is abolished by SREBP1c knockdown.\",\n      \"method\": \"Dual-luciferase reporter gene assay (SRE element), SREBP1c knockdown (siRNA), acetaldehyde treatment of AML12 cells\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay with siRNA pathway validation, single lab\",\n      \"pmids\": [\"29352167\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"During adipocyte britening, CIDEA shuttles from lipid droplets to the nucleus via a bipartite nuclear localization signal in a concentration-dependent manner. In the nucleus, CIDEA specifically inhibits LXRα-mediated repression of the UCP1 enhancer and strengthens PPARγ binding to the UCP1 enhancer, thereby driving UCP1 transcription.\",\n      \"method\": \"CRISPR-Cas9nD10A knockout of CIDEA in primary human adipocytes, CIDEA re-expression rescue, live-cell nuclear localization imaging, ChIP for LXRα and PPARγ at UCP1 enhancer, transcriptome analysis\",\n      \"journal\": \"iScience\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR KO with rescue, nuclear translocation assay, and ChIP at specific enhancer; multiple orthogonal methods in one study\",\n      \"pmids\": [\"31563853\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ER stress increases Cidea mRNA levels (maintained partly by increased mRNA stability) and stabilizes CIDE-A protein (normally sensitive to proteasomal degradation); this is negatively regulated by ATF6. Elevated CIDE-A expression under ER stress accompanies increased cell death.\",\n      \"method\": \"Induction of acute ER stress in PCCL3 thyrocytes, mRNA stability assay, proteasome inhibitor treatment, ATF6 manipulation, comparison with chronic ER stress-adapted cells\",\n      \"journal\": \"JCI insight\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mRNA stability and protein stability assays with pathway manipulation (ATF6), single lab, multiple cell types examined\",\n      \"pmids\": [\"33661766\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CIDEA overexpression in esophageal squamous cell carcinoma cells triggers G1-phase arrest and caspase-dependent mitochondrial apoptosis through the JNK-p21/Bad pathway; JNK activation by CIDEA induces actin cytoskeletal disruption, IL-6 release, and decreased STAT3 phosphorylation, while CIDEA-mediated apoptotic cell death and p53 acetylation are JNK-independent.\",\n      \"method\": \"CIDEA ectopic expression in ESCC cells, in vivo tumorigenesis in nude mice, caspase assay, JNK pathway inhibition, flow cytometry cell cycle analysis\",\n      \"journal\": \"Frontiers in oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo gain-of-function with pathway analysis using inhibitors, single lab\",\n      \"pmids\": [\"33614508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"METTL16 upregulates CIDEA expression at the translational level in an m6A-dependent manner in hepatocytes; METTL16 overexpression increases CIDEA expression and lipogenic gene expression in HepG2 cells.\",\n      \"method\": \"m6A high-throughput sequencing, METTL16 overexpression and knockdown in HepG2 cells, qRT-PCR and Western blot\",\n      \"journal\": \"PeerJ\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, overexpression/knockdown without direct m6A site validation on CIDEA mRNA in this paper\",\n      \"pmids\": [\"36518278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CIDEA inhibits AMPK activity in bovine mammary epithelial cells by suppressing AMPK phosphorylation, which enhances PPARγ expression and nuclear translocation of SREBP1, thereby increasing fatty acid and triglyceride synthesis.\",\n      \"method\": \"CIDEA overexpression and siRNA knockdown in bMECs, AMPK activity assay, PPARγ and SREBP1 expression and localization by Western blot/immunofluorescence, TAG quantification\",\n      \"journal\": \"Journal of agricultural and food chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain- and loss-of-function with mechanistic pathway readouts, single lab\",\n      \"pmids\": [\"36040348\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SENP2 increases CIDEA expression by desumoylating ERRα, which then acts in coordination with PGC-1α to activate CIDEA transcription in adipocytes; palmitate treatment increases both SENP2 and CIDEA expression, and ERRα or SENP2 knockdown eliminates palmitate-induced CIDEA upregulation.\",\n      \"method\": \"SENP2 overexpression in 3T3-L1 adipocytes, siRNA knockdown of SENP2 and ERRα, lipid droplet size measurement, palmitate treatment, qRT-PCR\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — SENP2 OE/KD and ERRα KD with functional readout, mechanistic desumoylation link established, single lab\",\n      \"pmids\": [\"37748256\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Egr-1 transcription factor regulates Cidea expression in a circadian-coupled manner in mouse liver; Egr-1 deletion disrupts the opposite rhythmic coupling of Egr-1 and Cidea, resulting in increased hepatic triglyceride accumulation and large lipid droplet formation.\",\n      \"method\": \"Egr-1 knockout mouse liver analysis, transcriptional rhythm profiling, lipid droplet and triglyceride quantification, light-induced circadian reset\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with defined transcriptional and metabolic phenotype, single lab\",\n      \"pmids\": [\"36964140\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"DNMT3B maintains Cidea promoter methylation to suppress CIDEA expression; LPS-induced reduction of DNMT3B causes promoter hypomethylation of CIDEA, increasing SREBP-1c binding to the CIDEA promoter and activating its expression, promoting hepatic lipid accumulation.\",\n      \"method\": \"DNMT3B overexpression and knockdown in mice and hepatocytes, bisulfite sequencing of CIDEA promoter, CIDEA interference in vivo, lipid accumulation assay\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic manipulation of DNMT3B in vivo and in vitro with promoter methylation analysis and functional rescue, single lab\",\n      \"pmids\": [\"37703946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In cochlear hair cells, Cidea expression is specifically induced by neomycin damage; Cidea knockout mice show reduced hair cell apoptosis from neomycin and noise exposure. CRISPR/SlugCas9-HF-mediated Cidea editing via AAV delivery significantly reduces hair cell loss.\",\n      \"method\": \"Cidea-null mouse model, neomycin and noise exposure in vivo, CRISPR/Cas9 AAV delivery, hair cell apoptosis quantification\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with phenotypic readout and in vivo CRISPR intervention, single lab, single study\",\n      \"pmids\": [\"41262044\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CIDEA is a multifunctional CIDE-domain protein that localizes primarily to lipid droplets (via its C-terminal domain) where it promotes lipid droplet fusion through PA-binding amphipathic helix-mediated trans-complexes, inhibits lipolysis, and regulates triglyceride storage; it also translocates to the nucleus to act as a transcriptional coactivator of C/EBPβ (driving XOR/milk lipid secretion) and to modulate LXRα/PPARγ-dependent UCP1 transcription during thermogenic beiging; in brown adipose tissue it indirectly suppresses UCP1 activity and promotes AMPK-β ubiquitin-proteasomal degradation; its own stability is controlled by ubiquitination at K23 and proteasomal degradation, and its transcription is regulated by PPARα/γ, SREBP-1c, ERRα/SENP2/PGC-1α, RIP140, NF-κB (via TNF-α), and DNMT3B-mediated promoter methylation.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CIDEA is a CIDE-domain protein that governs cellular triglyceride storage by acting at lipid droplets while doubling as a nuclear transcriptional regulator of lipid and thermogenic gene programs [#4, #12, #24]. At lipid droplets, where it colocalizes with perilipin, its C-terminal ~104 residues are necessary and sufficient for droplet targeting and for shielding stored triglyceride from lipolysis, whereas the N-terminal CIDE domain drives the formation of enlarged droplets [#4, #12]; mechanistically, CIDEA enlarges droplets by promoting lipid-droplet fusion through an amphipathic helix that embeds in the phospholipid monolayer and binds phosphatidic acid, forming trans-complexes at droplet-droplet contacts that permit directional lipid transfer [#21]. CIDEA also shuttles between droplets and the nucleus: during adipocyte browning a bipartite nuclear localization signal drives concentration-dependent nuclear entry, where CIDEA relieves LXRα-mediated repression and strengthens PPARγ binding at the UCP1 enhancer to drive UCP1 transcription [#24, #16], and in mammary epithelium it acts as a transcriptional coactivator of C/EBPβ, displacing HDAC1 to induce XOR expression required for milk lipid secretion [#18]. In brown fat CIDEA suppresses thermogenesis: knockout mice have elevated UCP1-dependent metabolic rate and resist diet-induced obesity, and CIDEA inhibits UCP1 activity indirectly without altering UCP1 protein levels [#1, #22], in part by complexing with the AMPK-β subunit in the ER and driving its ubiquitin-dependent degradation [#5]. CIDEA expression is integrated by lipogenic and nuclear-receptor signaling — induced by PPARα/γ, by SREBP-1c downstream of insulin and saturated fatty acids, and by ERRα/PGC-1α/SENP2 — and repressed by TNF-α via NF-κB/JNK and by DNMT3B-mediated promoter methylation [#3, #13, #19, #29, #9, #31], while CIDEA protein is itself turned over by proteasomal degradation following polyubiquitination at K23 [#2]. Independently of its lipid roles, CIDEA promotes apoptosis: its C-terminal region induces DNA fragmentation inhibitable by DFF45, and it functions as a pro-apoptotic effector in adipocytes, β-cells, and cochlear hair cells [#0, #14, #32].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established CIDEA's first molecular activity by showing it could trigger programmed cell death, defining a two-domain architecture in which the C-terminus kills and the N-terminal CIDE domain confers DFF45 regulation.\",\n      \"evidence\": \"Ectopic expression in 293T cells with DNA fragmentation assays, domain deletion mutants, and DFF45 co-expression\",\n      \"pmids\": [\"9564035\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the physiological context of apoptotic activity\", \"No endogenous substrate or partner of the C-terminal killing domain identified\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Connected CIDEA to whole-body energy metabolism by showing it restrains UCP1-dependent thermogenesis, recasting the apoptotic gene as a metabolic regulator.\",\n      \"evidence\": \"Cidea-null mouse with metabolic rate, cold tolerance, lipolysis measurements and direct UCP1 activity assay\",\n      \"pmids\": [\"12910269\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which CIDEA suppresses UCP1 not resolved\", \"Did not address subcellular site of action\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Defined how CIDEA protein abundance is controlled and how its transcription is wired to lipid-sensing nuclear receptors.\",\n      \"evidence\": \"CHX chase and ubiquitination assays with lysine mutagenesis (K23); EMSA/ChIP/reporter for PPARα/γ PPRE\",\n      \"pmids\": [\"17711404\", \"17462989\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"E3 ligase responsible for K23 ubiquitination not identified\", \"Tissue specificity of PPRE usage not resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Relocated CIDEA's primary site of action to lipid droplets and revealed two distinct metabolic mechanisms: suppression of lipolysis at droplets and ER-based degradation of AMPK-β.\",\n      \"evidence\": \"Perilipin colocalization, Cidea-GFP overexpression and RNAi lipolysis assays; reciprocal Co-IP and ubiquitination assays with AMPK subunits plus Cidea-null cells\",\n      \"pmids\": [\"18509062\", \"18480843\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation of earlier mitochondrial localization claims incomplete\", \"How CIDEA enlarges droplets mechanistically unresolved at this stage\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mapped upstream transcriptional and signaling control of CIDEA, including PGC-1α/ERRα activation, RIP140 corepression, and TNF-α suppression via NF-κB and JNK.\",\n      \"evidence\": \"Promoter reporter/EMSA assays, RIP140-PGC-1α interaction, RNAi with lipolysis and cytokine readouts, JNK inhibitor experiments in human adipocytes\",\n      \"pmids\": [\"18794372\", \"15919794\", \"18607384\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab promoter studies\", \"Post-transcriptional component of TNF-α effect not molecularly defined\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Documented apoptosis-associated nuclear redistribution of CIDEA, linking its localization to cell-death function.\",\n      \"evidence\": \"Immunocytochemistry and subcellular fractionation under apoptotic stimuli in HeLa cells\",\n      \"pmids\": [\"18645223\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism and signal driving translocation not defined\", \"Single-lab localization study\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Dissected CIDEA's domain logic at lipid droplets, separating C-terminal targeting/triglyceride shielding from N-terminal droplet enlargement, and tied hepatic CIDEA induction to the SREBP-1c/insulin axis.\",\n      \"evidence\": \"Deletion constructs with LD morphology and triglyceride/glycerol assays; EMSA/ChIP/reporter plus SREBP-1c-null hepatocytes; insulin-PI3K/Akt apoptosis studies\",\n      \"pmids\": [\"20810722\", \"20575761\", \"20154362\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of N-terminal-mediated enlargement not yet shown\", \"How insulin coordinately controls CIDEA in liver vs adipose not unified\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Expanded CIDEA's regulatory inputs (FoxO1, Akt1/2) and revealed direct interaction with LXRs, foreshadowing a nuclear-receptor coactivator role.\",\n      \"evidence\": \"siRNA epistasis and pathway inhibitors in adipocytes and β-cells; protein-binding and transactivation assays with cell fractionation for LXR\",\n      \"pmids\": [\"21636835\", \"21945815\", \"21315073\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"LXR interaction surface and direct binding not structurally mapped\", \"Single-lab interaction assays\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Demonstrated a bona fide nuclear transcriptional-coactivator function by showing CIDEA drives C/EBPβ-dependent XOR expression for milk lipid secretion.\",\n      \"evidence\": \"Nuclear Co-IP, ChIP for C/EBPβ and HDAC1 at Xdh promoter, Cidea-null mammary phenotype, and rescue\",\n      \"pmids\": [\"22245780\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CIDEA partitions between droplet and nuclear pools not defined here\", \"Generality of coactivator role across tissues unknown\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Provided the biophysical mechanism of CIDEA-driven droplet enlargement and clarified that brown-fat UCP1 suppression is indirect rather than via mitochondrial CIDEA.\",\n      \"evidence\": \"Amphipathic-helix mutagenesis, PA-binding and LD fusion reconstitution with live imaging; aP2-hCidea transgenic mice with isolated-mitochondria UCP1 activity assays\",\n      \"pmids\": [\"26609809\", \"27923808\", \"26118629\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular intermediary linking CIDEA to UCP1 activity inhibition still unidentified\", \"Regulation of trans-complex assembly in vivo not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Resolved the droplet-to-nucleus shuttling mechanism and showed nuclear CIDEA promotes thermogenesis by remodeling LXRα/PPARγ occupancy at the UCP1 enhancer, an apparent counterpoint to its BAT UCP1-suppressing role.\",\n      \"evidence\": \"CRISPR knockout with rescue in primary human adipocytes, live-cell NLS imaging, and ChIP at the UCP1 enhancer\",\n      \"pmids\": [\"31563853\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Reconciliation of pro- and anti-thermogenic roles across depots not settled\", \"Signals controlling concentration-dependent shuttling not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Layered additional transcriptional and epigenetic control (SENP2/ERRα/PGC-1α, Egr-1 circadian coupling, DNMT3B methylation) onto CIDEA regulation in metabolic tissues.\",\n      \"evidence\": \"SENP2/ERRα knockdown in adipocytes, Egr-1 knockout circadian liver profiling, DNMT3B manipulation with bisulfite sequencing and rescue\",\n      \"pmids\": [\"37748256\", \"36964140\", \"37703946\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mostly single-lab studies\", \"Integration of multiple inputs at a single promoter not modeled\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Extended CIDEA's pro-apoptotic function to a new physiological context, showing it mediates damage-induced hair-cell death and that its editing protects against ototoxic loss.\",\n      \"evidence\": \"Cidea-null mice with neomycin/noise exposure and AAV-delivered CRISPR editing in cochlea\",\n      \"pmids\": [\"41262044\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular pathway from CIDEA to hair-cell apoptosis not defined\", \"Single study\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The central unresolved question is how CIDEA reconciles its opposing roles—lipid-droplet fusion/storage, depot-specific pro- and anti-thermogenic transcriptional effects, and pro-apoptotic activity—through a unified control of its localization, abundance, and partner choice.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model unifying droplet-binding and nuclear coactivator surfaces\", \"Signals dictating droplet-vs-nucleus partitioning unknown\", \"Direct effector linking CIDEA to UCP1 activity inhibition unidentified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0008289\", \"supporting_discovery_ids\": [21]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [18, 24]},\n      {\"term_id\": \"GO:0140313\", \"supporting_discovery_ids\": [4, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005811\", \"supporting_discovery_ids\": [4, 12, 21]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [18, 24, 16]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [4, 12, 19]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [18, 24]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [0, 14, 32]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"PRKAB1\", \"CEBPB\", \"LXRA\", \"PPARG\", \"CIDEC\", \"DFFA\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}