{"gene":"ALDH3A2","run_date":"2026-06-09T22:02:43","timeline":{"discoveries":[{"year":1997,"finding":"The ALDH3A2 (FALDH) gene consists of 10 exons spanning ~30.5 kb with a TATA-less promoter; GC-rich sequences surrounding the transcription initiation site interact with proteins in HeLa nuclear extracts and promote transcription in vitro. An alternatively spliced mRNA was detected that encodes an enzyme isoform likely to have altered membrane-binding properties.","method":"Genomic sequencing, in vitro transcription assay, nuclear extract binding, Northern blot, RT-PCR","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro transcription and nuclear extract binding demonstrated promoter activity; alternative splicing characterized; single lab with multiple orthogonal methods","pmids":["9027499"],"is_preprint":false},{"year":1997,"finding":"The ALDH3A2 gene spans ~31 kb with 10 exons and 9 introns; transcription initiates 195 nt upstream of the ATG codon from a TATA-less promoter containing Sp1 and AP-2 binding sites. Two mRNA species (~4.0 and ~2.0 kb) arise from differential use of two polyadenylation sites. Expression is highest in liver and skeletal muscle.","method":"S1 nuclease protection, primer extension, Northern blot, sequence analysis","journal":"Genomics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple direct molecular methods in single lab establishing gene structure and transcriptional start site","pmids":["9070922"],"is_preprint":false},{"year":2005,"finding":"FALDH (ALDH3A2) catalyzes the oxidation of long-chain aldehydes derived from lipid metabolism; missense mutations in the ALDH3A2 gene result in profound reduction in enzyme activity as demonstrated by expression studies, confirming the catalytic function of the encoded protein.","method":"Expression studies of missense mutants, enzyme activity assays in cultured fibroblasts","journal":"Human mutation","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro expression and enzyme activity assays replicated across >38% of 72 identified mutations; multiple independent labs over years","pmids":["15931689"],"is_preprint":false},{"year":2004,"finding":"The ALDH3A2 missense mutation c.1139G>A (Ser380Asn) in the FALDH catalytic domain results in a protein with profoundly reduced enzymatic activity when expressed in cells; splice-site mutations produce aberrant mRNA transcripts (exon skipping).","method":"Expression of mutant FALDH constructs with enzyme activity assay; RT-PCR of fibroblast RNA for splice mutations","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct enzyme activity measurement of expressed mutant protein; single lab","pmids":["15241804"],"is_preprint":false},{"year":2006,"finding":"FALDH activity in human fibroblasts is induced by bezafibrate (a pan-PPAR agonist), indicating that ALDH3A2 expression is under PPARα-mediated transcriptional control; in SLS patient fibroblasts with the p.R228C mutation, bezafibrate induced FALDH activity to ~37% of control and increased FALDH mRNA ~1.8-fold.","method":"Enzyme activity assay in cultured human fibroblasts after bezafibrate treatment; mRNA quantification by Northern/RT analysis","journal":"Molecular genetics and metabolism","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — enzyme activity and mRNA measurements in multiple patient and control cell lines; single lab, two orthogonal methods","pmids":["16837225"],"is_preprint":false},{"year":2008,"finding":"FALDH (ALDH3A2) detoxifies 4-hydroxynonenal (HNE) in adipocytes; overexpression of FALDH by adenoviral infection in 3T3-L1 adipocytes reduces HNE-IRS-1/-2 adduct formation, partially restores HNE-impaired IRS-1 tyrosine phosphorylation, and rescues downstream PI3K and PKB activity and metabolic responses to insulin.","method":"Adenoviral FALDH overexpression in 3T3-L1 adipocytes; immunoprecipitation to detect HNE-IRS adducts; kinase activity assays; metabolic response assays","journal":"Diabetes","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional rescue with overexpression plus adduct detection, multiple downstream readouts in a single rigorous study","pmids":["18174527"],"is_preprint":false},{"year":2016,"finding":"In Aldh3a2 knockout mice, ALDH3A2 is the major fatty aldehyde dehydrogenase active in undifferentiated keratinocytes; its loss leads to severely impaired long-chain base (sphingolipid) metabolism, keratinocyte hyperproliferation with widened intercellular spaces in the basal epidermal layer, upregulation of oxidative stress-induced genes, and delayed skin barrier recovery after perturbation.","method":"Aldh3a2(-/-) mouse model; FALDH enzyme activity assays in keratinocytes; lipid metabolite analysis; skin barrier function measurement (transepidermal water loss); gene expression analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO model with defined cellular and biochemical phenotypes including enzymatic activity, lipid metabolism, and barrier function across multiple readouts","pmids":["27053112"],"is_preprint":false},{"year":2018,"finding":"During mesendoderm differentiation of human embryonic stem cells, Activin/Smad2 and Wnt/β-catenin signaling activate ALDH3A2 expression via FOXH1 recruitment to open chromatin regions following EZH2-dependent H3K27me3 reduction; knockdown of ALDH3A2 greatly attenuates mesendoderm differentiation.","method":"siRNA knockdown of ALDH3A2 in hESCs during differentiation; chromatin immunoprecipitation (H3K27me3); reporter assays; co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined differentiation phenotype and epigenetic mechanistic follow-up; single lab","pmids":["30282636"],"is_preprint":false},{"year":2021,"finding":"ALDH3A2 mutations in structural domains reduce or abolish FALDH enzymatic activity: mammalian expression of exon-9 mutants (p.Pro442Leu, p.Trp450Ter) confirmed profound reduction in aldehyde-oxidizing activity; p.Glu67Ter and p.Gly403Asp mutants also showed diminished aldehyde-oxidizing activity; p.Pro442Leu at the C-terminal α-helix is predicted and functionally consistent with impairment of the substrate gating process.","method":"Mammalian expression of ALDH3A2 mutant constructs; enzyme activity assays; skin biopsy histopathology","journal":"Human mutation","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct in vitro enzyme activity measurement of expressed mutant proteins, single lab","pmids":["34082469"],"is_preprint":false},{"year":2023,"finding":"Knockout of ALDH3A2 in ovarian cancer cells increases ferroptosis sensitivity, while overexpression attenuates it; ALDH3A2 knockout activates lipid metabolic, GSH metabolic, phospholipid metabolic, and aldehyde metabolic pathways as revealed by transcriptomic sequencing.","method":"ALDH3A2 knockout and overexpression in ovarian cancer cell lines; ferroptosis sensitivity assays; RNA sequencing","journal":"Gene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional genetic manipulation (KO and OE) with defined ferroptosis phenotype; single lab","pmids":["37247796"],"is_preprint":false},{"year":2023,"finding":"ALDH3A2 is downregulated in ccRCC via miR-1182; silencing ALDH3A2 promotes lipid accumulation in ccRCC cells by activating the PI3K-AKT pathway, thereby promoting tumor progression and EMT.","method":"miR-1182 overexpression/inhibition; ALDH3A2 knockdown and overexpression; Western blot for PI3K-AKT pathway; lipid accumulation assays; in vitro functional assays","journal":"Translational oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — directional manipulation of miR-1182/ALDH3A2 axis with pathway readouts; single lab","pmids":["38039946"],"is_preprint":false},{"year":2025,"finding":"ALDH3A2 overexpression in rat pulmonary artery smooth muscle cells (RPASMCs) suppresses proliferation, anti-apoptosis signaling, cell cycle progression (S+G2/M), hypoxia-induced migration, and inhibits glycolytic enzymes (HK2, PGK1) and lactate dehydrogenase, identifying ALDH3A2 as a regulator of glycolysis in these cells.","method":"ALDH3A2 overexpression in RPASMCs; proliferation, cell cycle, migration assays; Western blot for glycolytic enzymes; MCT-induced PAH rat model validation","journal":"European journal of pharmacology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function with multiple cellular and biochemical readouts; single lab, corroborated in animal model","pmids":["40618980"],"is_preprint":false},{"year":2025,"finding":"ALDH3A2 in gastric cancer suppresses tumor progression by impairing the mitochondrial unfolded protein response (UPRmt) through downregulation of SLC47A1 via blockade of NRF2 nuclear translocation, leading to mitochondrial dysfunction, GPX4 downregulation, lipid peroxidation, and ferroptosis; ALDH3A2-induced ferroptosis promotes IL-6 release driving M1 macrophage polarization with elevated IL-1β, which inhibits GC cell progression by downregulating PD-L1.","method":"ALDH3A2 overexpression/knockdown in GC cell lines; GPX4 overexpression rescue; UPRmt restoration rescue; NRF2 nuclear translocation assay; co-culture macrophage polarization assay; in vivo xenograft model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple epistasis/rescue experiments with defined molecular mechanism; single lab","pmids":["41444219"],"is_preprint":false},{"year":2025,"finding":"ALDH3A2 overexpression in TNBC cells promotes migration/invasion and EMT activation; mechanistically, ALDH3A2 drives arachidonic acid (AA) enrichment and lipid accumulation, suppresses AMPK phosphorylation (via AMP/ATP imbalance), and activates mTOR/SREBP1 signaling; mTOR inhibition attenuates ALDH3A2-induced lipid metabolic alterations.","method":"ALDH3A2 overexpression/knockdown in TNBC cell lines; lipidomic profiling; Western blot for AMPK/mTOR/SREBP1; lipid droplet quantification; mTOR inhibitor rescue; murine metastasis model","journal":"Breast cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — bidirectional genetic manipulation with lipidomic and signaling pathway mechanistic follow-up; single lab","pmids":["41413590"],"is_preprint":false}],"current_model":"ALDH3A2 encodes fatty aldehyde dehydrogenase (FALDH), a microsomal enzyme that catalyzes the NAD+-dependent oxidation of long-chain aliphatic and reactive aldehydes (including lipid peroxidation products such as 4-hydroxynonenal) to their corresponding fatty acids; loss of this activity in keratinocytes impairs sphingolipid long-chain base metabolism and causes oxidative stress-driven hyperproliferation, while its expression is transcriptionally regulated by PPARα/PPAR agonists and by Activin/Wnt signaling through epigenetic (H3K27me3) mechanisms; beyond lipid detoxification, ALDH3A2 modulates ferroptosis sensitivity, glycolytic flux, and cell proliferation in multiple cell types through pathways including NRF2/GPX4/UPRmt and AMPK/mTOR."},"narrative":{"mechanistic_narrative":"ALDH3A2 encodes a fatty aldehyde dehydrogenase (FALDH) that oxidizes long-chain and reactive aliphatic aldehydes derived from lipid metabolism, a function established directly by expression of missense mutants that abolish aldehyde-oxidizing activity [PMID:15931689, PMID:34082469]. The catalytic center maps to defined structural domains, with mutations in the catalytic domain and at the C-terminal α-helix governing substrate gating producing profound loss of activity [PMID:15241804, PMID:34082469]. A central physiological role of this activity is detoxification of reactive lipid peroxidation products: in adipocytes FALDH clears 4-hydroxynonenal and prevents HNE-IRS adduct formation, restoring insulin signaling through PI3K/PKB [PMID:18174527], and in keratinocytes its loss impairs sphingolipid long-chain base metabolism, drives oxidative stress gene induction, keratinocyte hyperproliferation, and delayed skin barrier recovery [PMID:27053112]. ALDH3A2 expression is transcriptionally controlled: it is induced by the pan-PPAR agonist bezafibrate, indicating PPARα-mediated regulation [PMID:16837225], and is activated during mesendoderm differentiation of human embryonic stem cells by Activin/Smad2 and Wnt/β-catenin signaling via FOXH1 recruitment following EZH2-dependent H3K27me3 reduction, with its knockdown attenuating differentiation [PMID:30282636]. Across multiple cancer contexts ALDH3A2 modulates lipid handling and redox balance to control proliferation and ferroptosis: it limits ferroptosis sensitivity in ovarian cancer [PMID:37247796], suppresses tumor progression in gastric cancer by blocking NRF2 nuclear translocation to downregulate SLC47A1 and the UPRmt, lowering GPX4 and promoting lipid peroxidation and ferroptosis [PMID:41444219], suppresses glycolysis and proliferation in pulmonary artery smooth muscle cells [PMID:40618980], and conversely promotes lipid accumulation and EMT in renal and triple-negative breast cancer cells through PI3K-AKT and AMPK/mTOR/SREBP1 signaling [PMID:38039946, PMID:41413590]. The gene structure comprises 10 exons under a TATA-less, GC-rich promoter with Sp1/AP-2 sites and produces alternatively spliced and differentially polyadenylated transcripts [PMID:9027499, PMID:9070922].","teleology":[{"year":1997,"claim":"Defining the ALDH3A2 gene architecture and promoter established how the enzyme is transcribed and that splicing diversity could generate isoforms with altered membrane association.","evidence":"Genomic sequencing, in vitro transcription, nuclear extract binding, S1/primer extension, and Northern/RT-PCR analysis","pmids":["9027499","9070922"],"confidence":"Medium","gaps":["Functional consequence of the alternatively spliced isoform on membrane binding not directly tested","Identity of GC-box-binding factors beyond Sp1/AP-2 not resolved"]},{"year":2005,"claim":"Expression of disease-associated missense mutants confirmed that the encoded protein is a catalytically active long-chain fatty aldehyde dehydrogenase whose activity is lost by point mutation.","evidence":"Expression of missense mutants with enzyme activity assays in cultured fibroblasts","pmids":["15931689","15241804"],"confidence":"High","gaps":["Full substrate spectrum not enumerated by these assays","Structural basis of activity loss inferred rather than crystallographically resolved"]},{"year":2008,"claim":"Adipocyte rescue experiments showed the enzyme's biological purpose includes detoxifying the lipid peroxidation product HNE, linking FALDH activity to preservation of insulin signaling.","evidence":"Adenoviral FALDH overexpression in 3T3-L1 adipocytes with HNE-IRS adduct detection and kinase/metabolic readouts","pmids":["18174527"],"confidence":"High","gaps":["Whether endogenous FALDH levels are rate-limiting for HNE clearance in vivo not addressed","Quantitative contribution relative to other aldehyde-detoxifying enzymes unclear"]},{"year":2006,"claim":"Pharmacologic induction by bezafibrate placed ALDH3A2 transcription under PPARα control, suggesting a route to restore activity in deficient cells.","evidence":"Enzyme activity and mRNA measurement in control and SLS patient fibroblasts after bezafibrate treatment","pmids":["16837225"],"confidence":"Medium","gaps":["Direct PPARα binding to the promoter not demonstrated","Partial (~37%) activity restoration in mutant cells leaves clinical relevance uncertain"]},{"year":2016,"claim":"A knockout mouse defined ALDH3A2 as the dominant keratinocyte FALDH and connected its loss to disrupted sphingolipid metabolism, oxidative stress, hyperproliferation, and barrier dysfunction.","evidence":"Aldh3a2(-/-) mouse with keratinocyte enzyme assays, lipid metabolite profiling, transepidermal water loss, and gene expression analysis","pmids":["27053112"],"confidence":"High","gaps":["Molecular link between long-chain base accumulation and hyperproliferation not fully dissected","Specific oxidative-stress effectors driving the phenotype not identified"]},{"year":2018,"claim":"Identifying ALDH3A2 as an Activin/Wnt-FOXH1 target downstream of H3K27me3 remodeling extended its role from lipid detoxification to a requirement for mesendoderm differentiation.","evidence":"siRNA knockdown in differentiating hESCs with H3K27me3 ChIP, reporter assays, and co-immunoprecipitation","pmids":["30282636"],"confidence":"Medium","gaps":["Whether ALDH3A2's enzymatic activity is required for differentiation not separated from a non-catalytic role","Downstream metabolic targets in differentiation unknown"]},{"year":2023,"claim":"Genetic manipulation in renal and ovarian cancer cells revealed ALDH3A2 as a modulator of lipid metabolism and ferroptosis sensitivity with context-dependent tumor effects.","evidence":"Knockout/overexpression and miR-1182 axis manipulation with ferroptosis assays, RNA-seq, PI3K-AKT readouts, and lipid accumulation assays","pmids":["37247796","38039946"],"confidence":"Medium","gaps":["Direct enzymatic substrate driving ferroptosis sensitivity not pinpointed","Single cell-line systems per tumor type"]},{"year":2025,"claim":"Mechanistic cancer studies positioned ALDH3A2 at lipid-redox control nodes—NRF2/GPX4/UPRmt, glycolytic flux, and AMPK/mTOR/SREBP1—with opposing pro- or anti-tumor outcomes by tissue.","evidence":"Overexpression/knockdown with rescue epistasis (GPX4, UPRmt, mTOR inhibition), lipidomics, glycolytic enzyme blots, macrophage co-culture, and xenograft/metastasis models","pmids":["41444219","40618980","41413590"],"confidence":"Medium","gaps":["How a single aldehyde dehydrogenase produces opposite tumor effects across tissues mechanistically unreconciled","Whether signaling effects require catalytic activity versus aldehyde substrate flux not isolated","Each axis shown in a single lab/model"]},{"year":null,"claim":"It remains unresolved how ALDH3A2 catalytic aldehyde clearance is mechanistically coupled to the divergent NRF2, AMPK/mTOR, PI3K-AKT, and glycolytic signaling outcomes reported across tissues.","evidence":"","pmids":[],"confidence":"Low","gaps":["No unifying model linking enzymatic substrate flux to the multiple downstream signaling axes","No structural data on substrate gating in the corpus","Catalytic-dead mutant tests of signaling roles absent"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[2,3,5,8]},{"term_id":"GO:0016787","term_label":"hydrolase activity","supporting_discovery_ids":[2,6]}],"localization":[],"pathway":[{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[5,6,9,13]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[9,12]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[4,7]}],"complexes":[],"partners":[],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P51648","full_name":"Aldehyde dehydrogenase family 3 member A2","aliases":["Aldehyde dehydrogenase 10","Fatty aldehyde dehydrogenase","Microsomal aldehyde dehydrogenase"],"length_aa":485,"mass_kda":54.8,"function":"Catalyzes the oxidation of medium and long chain aliphatic aldehydes to fatty acids. Active on a variety of saturated and unsaturated aliphatic aldehydes between 6 and 24 carbons in length (PubMed:18035827, PubMed:18182499, PubMed:22633490, PubMed:25047030, PubMed:9133646, PubMed:9662422). Responsible for conversion of the sphingosine 1-phosphate (S1P) degradation product hexadecenal to hexadecenoic acid (PubMed:22633490)","subcellular_location":"Microsome membrane; Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/P51648/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/ALDH3A2","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":[{"gene":"CANX","stoichiometry":0.2},{"gene":"CDS1","stoichiometry":0.2},{"gene":"CDS2","stoichiometry":0.2},{"gene":"COPB2","stoichiometry":0.2},{"gene":"PGRMC1","stoichiometry":0.2},{"gene":"RELA","stoichiometry":0.2},{"gene":"RER1","stoichiometry":0.2},{"gene":"RTN4","stoichiometry":0.2},{"gene":"SEC61B","stoichiometry":0.2},{"gene":"SPTLC1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/ALDH3A2","total_profiled":1310},"omim":[{"mim_id":"613738","title":"ALKYLGLYCEROL MONOOXYGENASE; AGMO","url":"https://www.omim.org/entry/613738"},{"mim_id":"609523","title":"ALDEHYDE DEHYDROGENASE, FAMILY 3, SUBFAMILY A, MEMBER 2; ALDH3A2","url":"https://www.omim.org/entry/609523"},{"mim_id":"270200","title":"SJOGREN-LARSSON SYNDROME; SLS","url":"https://www.omim.org/entry/270200"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Endoplasmic reticulum","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"liver","ntpm":269.4}],"url":"https://www.proteinatlas.org/search/ALDH3A2"},"hgnc":{"alias_symbol":["FALDH"],"prev_symbol":["SLS","ALDH10"]},"alphafold":{"accession":"P51648","domains":[{"cath_id":"3.40.605.10","chopping":"2-209_411-425","consensus_level":"high","plddt":98.5997,"start":2,"end":425},{"cath_id":"3.40.309.10","chopping":"214-401","consensus_level":"high","plddt":98.6289,"start":214,"end":401},{"cath_id":"-","chopping":"433-484","consensus_level":"medium","plddt":81.9483,"start":433,"end":484}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P51648","model_url":"https://alphafold.ebi.ac.uk/files/AF-P51648-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P51648-F1-predicted_aligned_error_v6.png","plddt_mean":96.62},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ALDH3A2","jax_strain_url":"https://www.jax.org/strain/search?query=ALDH3A2"},"sequence":{"accession":"P51648","fasta_url":"https://rest.uniprot.org/uniprotkb/P51648.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P51648/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P51648"}},"corpus_meta":[{"pmid":"15931689","id":"PMC_15931689","title":"Sjögren-Larsson 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An alternatively spliced mRNA was detected that encodes an enzyme isoform likely to have altered membrane-binding properties.\",\n      \"method\": \"Genomic sequencing, in vitro transcription assay, nuclear extract binding, Northern blot, RT-PCR\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro transcription and nuclear extract binding demonstrated promoter activity; alternative splicing characterized; single lab with multiple orthogonal methods\",\n      \"pmids\": [\"9027499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"The ALDH3A2 gene spans ~31 kb with 10 exons and 9 introns; transcription initiates 195 nt upstream of the ATG codon from a TATA-less promoter containing Sp1 and AP-2 binding sites. Two mRNA species (~4.0 and ~2.0 kb) arise from differential use of two polyadenylation sites. Expression is highest in liver and skeletal muscle.\",\n      \"method\": \"S1 nuclease protection, primer extension, Northern blot, sequence analysis\",\n      \"journal\": \"Genomics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple direct molecular methods in single lab establishing gene structure and transcriptional start site\",\n      \"pmids\": [\"9070922\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"FALDH (ALDH3A2) catalyzes the oxidation of long-chain aldehydes derived from lipid metabolism; missense mutations in the ALDH3A2 gene result in profound reduction in enzyme activity as demonstrated by expression studies, confirming the catalytic function of the encoded protein.\",\n      \"method\": \"Expression studies of missense mutants, enzyme activity assays in cultured fibroblasts\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro expression and enzyme activity assays replicated across >38% of 72 identified mutations; multiple independent labs over years\",\n      \"pmids\": [\"15931689\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The ALDH3A2 missense mutation c.1139G>A (Ser380Asn) in the FALDH catalytic domain results in a protein with profoundly reduced enzymatic activity when expressed in cells; splice-site mutations produce aberrant mRNA transcripts (exon skipping).\",\n      \"method\": \"Expression of mutant FALDH constructs with enzyme activity assay; RT-PCR of fibroblast RNA for splice mutations\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct enzyme activity measurement of expressed mutant protein; single lab\",\n      \"pmids\": [\"15241804\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"FALDH activity in human fibroblasts is induced by bezafibrate (a pan-PPAR agonist), indicating that ALDH3A2 expression is under PPARα-mediated transcriptional control; in SLS patient fibroblasts with the p.R228C mutation, bezafibrate induced FALDH activity to ~37% of control and increased FALDH mRNA ~1.8-fold.\",\n      \"method\": \"Enzyme activity assay in cultured human fibroblasts after bezafibrate treatment; mRNA quantification by Northern/RT analysis\",\n      \"journal\": \"Molecular genetics and metabolism\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — enzyme activity and mRNA measurements in multiple patient and control cell lines; single lab, two orthogonal methods\",\n      \"pmids\": [\"16837225\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"FALDH (ALDH3A2) detoxifies 4-hydroxynonenal (HNE) in adipocytes; overexpression of FALDH by adenoviral infection in 3T3-L1 adipocytes reduces HNE-IRS-1/-2 adduct formation, partially restores HNE-impaired IRS-1 tyrosine phosphorylation, and rescues downstream PI3K and PKB activity and metabolic responses to insulin.\",\n      \"method\": \"Adenoviral FALDH overexpression in 3T3-L1 adipocytes; immunoprecipitation to detect HNE-IRS adducts; kinase activity assays; metabolic response assays\",\n      \"journal\": \"Diabetes\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional rescue with overexpression plus adduct detection, multiple downstream readouts in a single rigorous study\",\n      \"pmids\": [\"18174527\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"In Aldh3a2 knockout mice, ALDH3A2 is the major fatty aldehyde dehydrogenase active in undifferentiated keratinocytes; its loss leads to severely impaired long-chain base (sphingolipid) metabolism, keratinocyte hyperproliferation with widened intercellular spaces in the basal epidermal layer, upregulation of oxidative stress-induced genes, and delayed skin barrier recovery after perturbation.\",\n      \"method\": \"Aldh3a2(-/-) mouse model; FALDH enzyme activity assays in keratinocytes; lipid metabolite analysis; skin barrier function measurement (transepidermal water loss); gene expression analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO model with defined cellular and biochemical phenotypes including enzymatic activity, lipid metabolism, and barrier function across multiple readouts\",\n      \"pmids\": [\"27053112\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"During mesendoderm differentiation of human embryonic stem cells, Activin/Smad2 and Wnt/β-catenin signaling activate ALDH3A2 expression via FOXH1 recruitment to open chromatin regions following EZH2-dependent H3K27me3 reduction; knockdown of ALDH3A2 greatly attenuates mesendoderm differentiation.\",\n      \"method\": \"siRNA knockdown of ALDH3A2 in hESCs during differentiation; chromatin immunoprecipitation (H3K27me3); reporter assays; co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined differentiation phenotype and epigenetic mechanistic follow-up; single lab\",\n      \"pmids\": [\"30282636\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ALDH3A2 mutations in structural domains reduce or abolish FALDH enzymatic activity: mammalian expression of exon-9 mutants (p.Pro442Leu, p.Trp450Ter) confirmed profound reduction in aldehyde-oxidizing activity; p.Glu67Ter and p.Gly403Asp mutants also showed diminished aldehyde-oxidizing activity; p.Pro442Leu at the C-terminal α-helix is predicted and functionally consistent with impairment of the substrate gating process.\",\n      \"method\": \"Mammalian expression of ALDH3A2 mutant constructs; enzyme activity assays; skin biopsy histopathology\",\n      \"journal\": \"Human mutation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro enzyme activity measurement of expressed mutant proteins, single lab\",\n      \"pmids\": [\"34082469\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Knockout of ALDH3A2 in ovarian cancer cells increases ferroptosis sensitivity, while overexpression attenuates it; ALDH3A2 knockout activates lipid metabolic, GSH metabolic, phospholipid metabolic, and aldehyde metabolic pathways as revealed by transcriptomic sequencing.\",\n      \"method\": \"ALDH3A2 knockout and overexpression in ovarian cancer cell lines; ferroptosis sensitivity assays; RNA sequencing\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional genetic manipulation (KO and OE) with defined ferroptosis phenotype; single lab\",\n      \"pmids\": [\"37247796\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ALDH3A2 is downregulated in ccRCC via miR-1182; silencing ALDH3A2 promotes lipid accumulation in ccRCC cells by activating the PI3K-AKT pathway, thereby promoting tumor progression and EMT.\",\n      \"method\": \"miR-1182 overexpression/inhibition; ALDH3A2 knockdown and overexpression; Western blot for PI3K-AKT pathway; lipid accumulation assays; in vitro functional assays\",\n      \"journal\": \"Translational oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — directional manipulation of miR-1182/ALDH3A2 axis with pathway readouts; single lab\",\n      \"pmids\": [\"38039946\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ALDH3A2 overexpression in rat pulmonary artery smooth muscle cells (RPASMCs) suppresses proliferation, anti-apoptosis signaling, cell cycle progression (S+G2/M), hypoxia-induced migration, and inhibits glycolytic enzymes (HK2, PGK1) and lactate dehydrogenase, identifying ALDH3A2 as a regulator of glycolysis in these cells.\",\n      \"method\": \"ALDH3A2 overexpression in RPASMCs; proliferation, cell cycle, migration assays; Western blot for glycolytic enzymes; MCT-induced PAH rat model validation\",\n      \"journal\": \"European journal of pharmacology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function with multiple cellular and biochemical readouts; single lab, corroborated in animal model\",\n      \"pmids\": [\"40618980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ALDH3A2 in gastric cancer suppresses tumor progression by impairing the mitochondrial unfolded protein response (UPRmt) through downregulation of SLC47A1 via blockade of NRF2 nuclear translocation, leading to mitochondrial dysfunction, GPX4 downregulation, lipid peroxidation, and ferroptosis; ALDH3A2-induced ferroptosis promotes IL-6 release driving M1 macrophage polarization with elevated IL-1β, which inhibits GC cell progression by downregulating PD-L1.\",\n      \"method\": \"ALDH3A2 overexpression/knockdown in GC cell lines; GPX4 overexpression rescue; UPRmt restoration rescue; NRF2 nuclear translocation assay; co-culture macrophage polarization assay; in vivo xenograft model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple epistasis/rescue experiments with defined molecular mechanism; single lab\",\n      \"pmids\": [\"41444219\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ALDH3A2 overexpression in TNBC cells promotes migration/invasion and EMT activation; mechanistically, ALDH3A2 drives arachidonic acid (AA) enrichment and lipid accumulation, suppresses AMPK phosphorylation (via AMP/ATP imbalance), and activates mTOR/SREBP1 signaling; mTOR inhibition attenuates ALDH3A2-induced lipid metabolic alterations.\",\n      \"method\": \"ALDH3A2 overexpression/knockdown in TNBC cell lines; lipidomic profiling; Western blot for AMPK/mTOR/SREBP1; lipid droplet quantification; mTOR inhibitor rescue; murine metastasis model\",\n      \"journal\": \"Breast cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — bidirectional genetic manipulation with lipidomic and signaling pathway mechanistic follow-up; single lab\",\n      \"pmids\": [\"41413590\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ALDH3A2 encodes fatty aldehyde dehydrogenase (FALDH), a microsomal enzyme that catalyzes the NAD+-dependent oxidation of long-chain aliphatic and reactive aldehydes (including lipid peroxidation products such as 4-hydroxynonenal) to their corresponding fatty acids; loss of this activity in keratinocytes impairs sphingolipid long-chain base metabolism and causes oxidative stress-driven hyperproliferation, while its expression is transcriptionally regulated by PPARα/PPAR agonists and by Activin/Wnt signaling through epigenetic (H3K27me3) mechanisms; beyond lipid detoxification, ALDH3A2 modulates ferroptosis sensitivity, glycolytic flux, and cell proliferation in multiple cell types through pathways including NRF2/GPX4/UPRmt and AMPK/mTOR.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ALDH3A2 encodes a fatty aldehyde dehydrogenase (FALDH) that oxidizes long-chain and reactive aliphatic aldehydes derived from lipid metabolism, a function established directly by expression of missense mutants that abolish aldehyde-oxidizing activity [#2, #8]. The catalytic center maps to defined structural domains, with mutations in the catalytic domain and at the C-terminal α-helix governing substrate gating producing profound loss of activity [#3, #8]. A central physiological role of this activity is detoxification of reactive lipid peroxidation products: in adipocytes FALDH clears 4-hydroxynonenal and prevents HNE-IRS adduct formation, restoring insulin signaling through PI3K/PKB [#5], and in keratinocytes its loss impairs sphingolipid long-chain base metabolism, drives oxidative stress gene induction, keratinocyte hyperproliferation, and delayed skin barrier recovery [#6]. ALDH3A2 expression is transcriptionally controlled: it is induced by the pan-PPAR agonist bezafibrate, indicating PPARα-mediated regulation [#4], and is activated during mesendoderm differentiation of human embryonic stem cells by Activin/Smad2 and Wnt/β-catenin signaling via FOXH1 recruitment following EZH2-dependent H3K27me3 reduction, with its knockdown attenuating differentiation [#7]. Across multiple cancer contexts ALDH3A2 modulates lipid handling and redox balance to control proliferation and ferroptosis: it limits ferroptosis sensitivity in ovarian cancer [#9], suppresses tumor progression in gastric cancer by blocking NRF2 nuclear translocation to downregulate SLC47A1 and the UPRmt, lowering GPX4 and promoting lipid peroxidation and ferroptosis [#12], suppresses glycolysis and proliferation in pulmonary artery smooth muscle cells [#11], and conversely promotes lipid accumulation and EMT in renal and triple-negative breast cancer cells through PI3K-AKT and AMPK/mTOR/SREBP1 signaling [#10, #13]. The gene structure comprises 10 exons under a TATA-less, GC-rich promoter with Sp1/AP-2 sites and produces alternatively spliced and differentially polyadenylated transcripts [#0, #1].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Defining the ALDH3A2 gene architecture and promoter established how the enzyme is transcribed and that splicing diversity could generate isoforms with altered membrane association.\",\n      \"evidence\": \"Genomic sequencing, in vitro transcription, nuclear extract binding, S1/primer extension, and Northern/RT-PCR analysis\",\n      \"pmids\": [\"9027499\", \"9070922\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of the alternatively spliced isoform on membrane binding not directly tested\", \"Identity of GC-box-binding factors beyond Sp1/AP-2 not resolved\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Expression of disease-associated missense mutants confirmed that the encoded protein is a catalytically active long-chain fatty aldehyde dehydrogenase whose activity is lost by point mutation.\",\n      \"evidence\": \"Expression of missense mutants with enzyme activity assays in cultured fibroblasts\",\n      \"pmids\": [\"15931689\", \"15241804\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full substrate spectrum not enumerated by these assays\", \"Structural basis of activity loss inferred rather than crystallographically resolved\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Adipocyte rescue experiments showed the enzyme's biological purpose includes detoxifying the lipid peroxidation product HNE, linking FALDH activity to preservation of insulin signaling.\",\n      \"evidence\": \"Adenoviral FALDH overexpression in 3T3-L1 adipocytes with HNE-IRS adduct detection and kinase/metabolic readouts\",\n      \"pmids\": [\"18174527\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether endogenous FALDH levels are rate-limiting for HNE clearance in vivo not addressed\", \"Quantitative contribution relative to other aldehyde-detoxifying enzymes unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Pharmacologic induction by bezafibrate placed ALDH3A2 transcription under PPARα control, suggesting a route to restore activity in deficient cells.\",\n      \"evidence\": \"Enzyme activity and mRNA measurement in control and SLS patient fibroblasts after bezafibrate treatment\",\n      \"pmids\": [\"16837225\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct PPARα binding to the promoter not demonstrated\", \"Partial (~37%) activity restoration in mutant cells leaves clinical relevance uncertain\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"A knockout mouse defined ALDH3A2 as the dominant keratinocyte FALDH and connected its loss to disrupted sphingolipid metabolism, oxidative stress, hyperproliferation, and barrier dysfunction.\",\n      \"evidence\": \"Aldh3a2(-/-) mouse with keratinocyte enzyme assays, lipid metabolite profiling, transepidermal water loss, and gene expression analysis\",\n      \"pmids\": [\"27053112\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular link between long-chain base accumulation and hyperproliferation not fully dissected\", \"Specific oxidative-stress effectors driving the phenotype not identified\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying ALDH3A2 as an Activin/Wnt-FOXH1 target downstream of H3K27me3 remodeling extended its role from lipid detoxification to a requirement for mesendoderm differentiation.\",\n      \"evidence\": \"siRNA knockdown in differentiating hESCs with H3K27me3 ChIP, reporter assays, and co-immunoprecipitation\",\n      \"pmids\": [\"30282636\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ALDH3A2's enzymatic activity is required for differentiation not separated from a non-catalytic role\", \"Downstream metabolic targets in differentiation unknown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Genetic manipulation in renal and ovarian cancer cells revealed ALDH3A2 as a modulator of lipid metabolism and ferroptosis sensitivity with context-dependent tumor effects.\",\n      \"evidence\": \"Knockout/overexpression and miR-1182 axis manipulation with ferroptosis assays, RNA-seq, PI3K-AKT readouts, and lipid accumulation assays\",\n      \"pmids\": [\"37247796\", \"38039946\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct enzymatic substrate driving ferroptosis sensitivity not pinpointed\", \"Single cell-line systems per tumor type\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Mechanistic cancer studies positioned ALDH3A2 at lipid-redox control nodes—NRF2/GPX4/UPRmt, glycolytic flux, and AMPK/mTOR/SREBP1—with opposing pro- or anti-tumor outcomes by tissue.\",\n      \"evidence\": \"Overexpression/knockdown with rescue epistasis (GPX4, UPRmt, mTOR inhibition), lipidomics, glycolytic enzyme blots, macrophage co-culture, and xenograft/metastasis models\",\n      \"pmids\": [\"41444219\", \"40618980\", \"41413590\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a single aldehyde dehydrogenase produces opposite tumor effects across tissues mechanistically unreconciled\", \"Whether signaling effects require catalytic activity versus aldehyde substrate flux not isolated\", \"Each axis shown in a single lab/model\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how ALDH3A2 catalytic aldehyde clearance is mechanistically coupled to the divergent NRF2, AMPK/mTOR, PI3K-AKT, and glycolytic signaling outcomes reported across tissues.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No unifying model linking enzymatic substrate flux to the multiple downstream signaling axes\", \"No structural data on substrate gating in the corpus\", \"Catalytic-dead mutant tests of signaling roles absent\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [2, 3, 5, 8]},\n      {\"term_id\": \"GO:0016787\", \"supporting_discovery_ids\": [2, 6]}\n    ],\n    \"localization\": [],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [5, 6, 9, 13]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [9, 12]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [4, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"tie","faith_supported":6,"faith_total":6,"faith_pct":100.0}}