{"gene":"RDH5","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":1999,"finding":"Recombinant human RDH5 catalyzes oxidation of 9-cis-retinol and 11-cis-retinol with equal efficiency, and also displays 3α-hydroxysteroid dehydrogenase activity recognizing 5α-androstan-3α,17β-diol and androsterone as substrates, but lacks 17β-hydroxysteroid and 11β-hydroxysteroid dehydrogenase activities (no activity toward testosterone, dihydrotestosterone, estradiol, or corticosterone).","method":"In vitro enzymatic assay with recombinant human RDH5","journal":"The Biochemical Journal","confidence":"High","confidence_rationale":"Tier 1 / Moderate — direct in vitro enzymatic assay with recombinant protein, multiple substrates tested with positive and negative results in a single focused study","pmids":["9931293"],"is_preprint":false},{"year":2001,"finding":"RDH5 encodes the dehydrogenase responsible for the majority of 11-cis-retinol oxidation to 11-cis-retinal in the retinal pigment epithelium (RPE). In Rdh5-/- mice, lack of RDH5 leads to accumulation of cis-retinoids (particularly 13-cis-isomers) after a bleach. Remaining RPE microsomal RDH activity in knockout mice is NADP-dependent and specific for 9-cis- and 11-cis-retinal but not 13-cis-retinal, explaining the 13-cis-isomer accumulation.","method":"Rdh5 knockout mouse model; retinoid analysis after bleach; microsomal enzymatic activity assays from RPE","journal":"The Journal of Biological Chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic knockout with biochemical characterization of retinoid accumulation and enzymatic activity in isolated RPE microsomes, replicated mechanistic conclusions in animal model","pmids":["11418621"],"is_preprint":false},{"year":2007,"finding":"Mouse Rdh1 (ortholog of human RDH5/RDH1) metabolizes retinoids in vivo: Rdh1-null mice show decreased liver Cyp26a1 mRNA and protein and increased liver and kidney retinoid stores on vitamin A-restricted diets, indicating Rdh1 generates all-trans-retinoic acid in vivo and that Cyp26a1 expression is regulated downstream of Rdh1 activity.","method":"Rdh1 knockout mouse (homologous recombination); retinoid quantification; qRT-PCR and Western blot for Cyp26a1","journal":"FASEB Journal","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic knockout with multiple orthogonal readouts (retinoid stores, Cyp26a1 mRNA, Cyp26a1 protein) in a single study","pmids":["17435174"],"is_preprint":false},{"year":2003,"finding":"Mouse Rdh1 (RDH1/RDH5 alias) contributes to all-trans-retinoic acid biosynthesis: RDH1 recognizes all-trans-retinol, 9-cis-retinol, 5α-androstan-3,17-diol, and 5α-androstan-3-ol-17-one as substrates and, when co-expressed with any of three retinal dehydrogenases in reporter cells, reconstitutes a path of all-trans-retinoic acid biosynthesis. RDH1 is the most efficient known mouse short-chain dehydrogenase for dehydrogenation of all-trans-retinol.","method":"Reconstituted all-trans-retinoic acid biosynthesis in reporter cells (co-expression with retinal dehydrogenases); substrate specificity assays","journal":"Gene","confidence":"High","confidence_rationale":"Tier 1 / Moderate — reconstitution of retinoic acid biosynthesis pathway in cells plus enzymatic substrate profiling in a single focused study","pmids":["12594048"],"is_preprint":false},{"year":2016,"finding":"MITF (microphthalmia-associated transcription factor) directly regulates Rdh5 expression in the RPE: Rdh5 mRNA is downregulated in optic cups and presumptive RPE of Mitf-deficient mouse embryos, and experimental manipulation of MITF levels in human RPE cells in culture causes corresponding changes in endogenous RDH5 levels.","method":"Mitf-knockout mouse embryos; MITF overexpression/knockdown in human RPE cells; qRT-PCR/Western blot for RDH5","journal":"Scientific Reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic model plus cell-based gain/loss-of-function, two orthogonal approaches, single lab","pmids":["26876013"],"is_preprint":false},{"year":2019,"finding":"Rdh1 (mouse ortholog)-generated all-trans-retinoic acid (atRA) in brown adipose tissue (BAT) regulates multiple genes promoting BAT adaptation to fasting and re-feeding. Rdh1 ablation eliminates the re-feeding-induced increase in BAT atRA, increases fatty acid uptake, attenuates lipolysis in primary brown adipocytes, reduces mitochondrial proteins (CYCS, UCP1), decreases mitochondrial oxygen consumption rate, and disrupts mitochondrial membrane potential, resulting in BAT and white adipose hypertrophy.","method":"Rdh1-null mouse model; primary brown adipocyte assays; RNAseq; mitochondrial function assays; retinoid quantification in BAT","journal":"Cellular and Molecular Life Sciences","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genetic knockout with multiple orthogonal functional readouts (retinoid measurements, primary cell assays, RNAseq, mitochondrial function), single lab","pmids":["30788515"],"is_preprint":false},{"year":2015,"finding":"A homozygous p.Tyr175Phe mutation in RDH5 causes fundus albipunctatus. The invariant tyrosine at position 175, one of the most conserved residues in short-chain dehydrogenase/reductase (SDR) enzymes, is crucial for RDH5 catalytic activity; substitution at this position is predicted and contextually established to abolish enzymatic function.","method":"Patient DNA sequencing; structural/functional context of the invariant SDR tyrosine","journal":"Journal of Applied Genetics","confidence":"Low","confidence_rationale":"Tier 3 / Weak — mutation identification in a patient with bioinformatic/structural inference of functional consequence; no direct enzymatic assay of the mutant protein performed","pmids":["25820994"],"is_preprint":false},{"year":2023,"finding":"All-trans retinoic acid (ATRA) inhibits RDH5 mRNA expression in ARPE-19 RPE cells in a dose-dependent manner, and siRNA-mediated knockdown of RDH5 significantly upregulates MMP-2 and TGF-β2 mRNA expression, suggesting RDH5 suppresses MMP-2 and TGF-β2 in RPE cells and may inhibit epithelial-mesenchymal transition.","method":"ATRA dose-response in ARPE-19 cells; siRNA knockdown of RDH5; qRT-PCR for RDH5, MMP-2, TGF-β2","journal":"International Journal of Ophthalmology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — siRNA knockdown with qRT-PCR readouts in cell line, two orthogonal perturbations (ATRA and siRNA), single lab","pmids":["37332553"],"is_preprint":false},{"year":2026,"finding":"The FA-associated RDH5/L310delinsEV mutant protein has a shortened half-life compared to wild-type RDH5. Unlike wild-type RDH5, which is degraded via autophagy-lysosomes, the L310delinsEV mutant is reduced in its localization to the endoplasmic reticulum and is instead polyubiquitinated and degraded via the ubiquitin-proteasome pathway. Both wild-type and mutant RDH5 interact with AMFR (an E3 ubiquitin ligase on the ER). AMFR overexpression increases and AMFR knockdown decreases degradation of L310delinsEV. The polyubiquitination sites on the mutant are Lys179 and Lys263; K179R/K263R double mutation reduces AMFR-mediated polyubiquitination and degradation.","method":"Half-life assay (pulse-chase/CHX); subcellular fractionation/localization; co-immunoprecipitation (AMFR-RDH5 interaction); AMFR overexpression and siRNA knockdown; site-directed mutagenesis (K179R, K263R); ubiquitination assays","journal":"Experimental Eye Research","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — multiple orthogonal methods including co-IP, mutagenesis of ubiquitination sites, genetic gain/loss of E3 ligase, and pathway (autophagy vs. proteasome) discrimination in a single focused study","pmids":["41679585"],"is_preprint":false},{"year":2023,"finding":"A missense mutation c.T722C/p.M241T in sheep RDH5 (exon 4) reduces retinol dehydrogenase activity encoded by RDH5, impairing retinoic acid metabolism and influencing the visual cycle.","method":"Whole genome resequencing; identification of missense variant; functional inference from reduced retinol dehydrogenase activity (reported as measured result for the sheep variant)","journal":"Archives Animal Breeding","confidence":"Low","confidence_rationale":"Tier 3 / Weak — activity reduction reported for a sheep RDH5 variant in a domestication/selection context study; minimal methodological detail in abstract","pmids":["37384328"],"is_preprint":false}],"current_model":"RDH5 (also known as RDH1/SDR9C5) is an endoplasmic reticulum-resident short-chain dehydrogenase/reductase that catalyzes the oxidation of 11-cis-retinol (and 9-cis-retinol) to the corresponding retinaldehydes as the final step of visual chromophore regeneration in the RPE, with its expression controlled by the transcription factor MITF; it also contributes to all-trans-retinoic acid biosynthesis in peripheral tissues by oxidizing all-trans-retinol, thereby regulating downstream retinoic acid-responsive gene expression including CYP26A1, and its disease-associated L310delinsEV mutant undergoes accelerated AMFR E3 ligase-mediated ubiquitination at Lys179/Lys263 and proteasomal degradation rather than the normal autophagy-lysosomal route, explaining the protein loss seen in fundus albipunctatus."},"narrative":{"mechanistic_narrative":"RDH5 (also termed RDH1) is an endoplasmic reticulum short-chain dehydrogenase/reductase that oxidizes cis- and all-trans-retinols, supplying retinaldehyde for both visual chromophore regeneration and retinoic acid biosynthesis [PMID:9931293, PMID:12594048]. In the retinal pigment epithelium it carries out the majority of 11-cis-retinol oxidation to 11-cis-retinal; its loss in knockout mice causes accumulation of cis-retinoids (particularly 13-cis isomers) following a bleach, leaving only a residual NADP-dependent activity that does not handle 13-cis substrates [PMID:11418621]. The enzyme also accepts 9-cis-retinol and several 3-hydroxysteroids while lacking 17β- and 11β-hydroxysteroid dehydrogenase activity [PMID:9931293]. In peripheral tissues RDH5/RDH1 is the most efficient short-chain dehydrogenase for all-trans-retinol and, acting upstream of retinal dehydrogenases, generates all-trans-retinoic acid that regulates downstream gene expression including CYP26A1 and a brown-adipose program of mitochondrial and lipid-handling genes [PMID:17435174, PMID:12594048, PMID:30788515]. RDH5 expression is directly controlled by the transcription factor MITF in the RPE [PMID:26876013]. Mutations in RDH5 cause fundus albipunctatus [PMID:25820994]; the disease-associated L310delinsEV mutant has reduced ER localization and a shortened half-life, being diverted from the normal autophagy-lysosomal route into AMFR-mediated polyubiquitination at Lys179/Lys263 and proteasomal degradation [PMID:41679585].","teleology":[{"year":1999,"claim":"Established the catalytic identity of human RDH5 by defining its retinoid and steroid substrate preferences, distinguishing it from related hydroxysteroid dehydrogenases.","evidence":"In vitro enzymatic assays with recombinant human RDH5 across multiple retinoid and steroid substrates","pmids":["9931293"],"confidence":"High","gaps":["Did not establish the in vivo physiological substrate or tissue context","No structural basis for substrate selectivity"]},{"year":2001,"claim":"Demonstrated that RDH5 accounts for most 11-cis-retinol oxidation in the RPE, placing it at the final oxidation step of visual chromophore regeneration.","evidence":"Rdh5 knockout mouse with post-bleach retinoid analysis and RPE microsomal activity assays","pmids":["11418621"],"confidence":"High","gaps":["Identity of the residual NADP-dependent RDH activity not resolved","Did not address retinoic acid roles outside the eye"]},{"year":2003,"claim":"Showed RDH5/RDH1 acts upstream of retinal dehydrogenases to reconstitute all-trans-retinoic acid biosynthesis, extending its role beyond the visual cycle.","evidence":"Reconstituted atRA biosynthesis in reporter cells co-expressing retinal dehydrogenases; substrate profiling","pmids":["12594048"],"confidence":"High","gaps":["In-cell reconstitution did not confirm endogenous flux in tissue","Relative contribution versus other retinol dehydrogenases unquantified"]},{"year":2007,"claim":"Confirmed in vivo that RDH1/RDH5 generates all-trans-retinoic acid and feeds the CYP26A1-controlled retinoid catabolism axis.","evidence":"Rdh1-null mice with retinoid quantification and Cyp26a1 mRNA/protein measurement under vitamin A restriction","pmids":["17435174"],"confidence":"High","gaps":["Tissue-specific contributions not dissected","Direct enzymatic flux not measured in intact tissue"]},{"year":2016,"claim":"Identified MITF as a direct upstream transcriptional regulator of RDH5 in the RPE, linking RPE identity to chromophore-regeneration capacity.","evidence":"Mitf-knockout mouse embryos and MITF gain/loss-of-function in human RPE cells with RDH5 readouts","pmids":["26876013"],"confidence":"Medium","gaps":["Direct MITF promoter occupancy at RDH5 not shown","Single-lab evidence"]},{"year":2019,"claim":"Extended RDH1/RDH5 atRA function to brown adipose tissue, showing it controls a fasting/re-feeding mitochondrial and lipid-handling gene program.","evidence":"Rdh1-null mice, primary brown adipocyte assays, RNAseq, mitochondrial function and retinoid measurements","pmids":["30788515"],"confidence":"High","gaps":["Specific atRA target genes mediating the BAT phenotype not fully mapped","Cross-species relevance to human adipose unaddressed"]},{"year":2015,"claim":"Linked an invariant SDR active-site tyrosine (Tyr175) mutation in RDH5 to fundus albipunctatus, implicating loss of catalysis in disease.","evidence":"Patient DNA sequencing with structural/contextual inference on the conserved SDR tyrosine","pmids":["25820994"],"confidence":"Low","gaps":["No direct enzymatic assay of the mutant protein performed","Functional consequence is inferred rather than measured"]},{"year":2023,"claim":"Connected RDH5 levels to RPE epithelial-mesenchymal phenotype, with atRA repressing RDH5 and RDH5 loss raising MMP-2 and TGF-β2.","evidence":"ATRA dose-response and siRNA knockdown of RDH5 in ARPE-19 cells with qRT-PCR","pmids":["37332553"],"confidence":"Medium","gaps":["Effects shown at mRNA level only; protein and functional EMT not demonstrated","Mechanism linking RDH5 to MMP-2/TGF-β2 unknown"]},{"year":2026,"claim":"Defined why the fundus albipunctatus L310delinsEV mutant is lost, showing a switch from autophagy-lysosomal turnover to AMFR-driven proteasomal degradation.","evidence":"Half-life/CHX assays, fractionation, AMFR co-IP, AMFR gain/loss, and K179R/K263R mutagenesis with ubiquitination assays","pmids":["41679585"],"confidence":"High","gaps":["Whether mutant retains any catalytic activity before degradation untested","Trigger for diverting the mutant away from the ER not defined"]},{"year":null,"claim":"How RDH5 substrate flux is partitioned between visual-cycle cis-retinol oxidation and peripheral all-trans-retinoic acid production across tissues remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model explaining dual retinoid/steroid substrate handling","Quantitative tissue-level partitioning of RDH5 activity unestablished"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016491","term_label":"oxidoreductase activity","supporting_discovery_ids":[0,1,3]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[1]},{"term_id":"R-HSA-1430728","term_label":"Metabolism","supporting_discovery_ids":[2,3,5]}],"complexes":[],"partners":["AMFR"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q92781","full_name":"Retinol dehydrogenase 5","aliases":["11-cis retinol dehydrogenase","11-cis RDH","11-cis RoDH","9-cis retinol dehydrogenase","9cRDH","Short chain dehydrogenase/reductase family 9C member 5"],"length_aa":318,"mass_kda":35.0,"function":"Catalyzes the oxidation of cis-isomers of retinol, including 11-cis-, 9-cis-, and 13-cis-retinol in an NAD-dependent manner (PubMed:10588954, PubMed:11675386, PubMed:9115228, PubMed:9931293). Has no activity towards all-trans retinal (By similarity). Plays a significant role in 11-cis retinol oxidation in the retinal pigment epithelium cells (RPE). Also recognizes steroids (androsterone, androstanediol) as its substrates (PubMed:29541409, PubMed:9931293)","subcellular_location":"Endoplasmic reticulum membrane","url":"https://www.uniprot.org/uniprotkb/Q92781/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/RDH5","classification":"Not Classified","n_dependent_lines":13,"n_total_lines":1208,"dependency_fraction":0.01076158940397351},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/RDH5","total_profiled":1310},"omim":[{"mim_id":"621259","title":"STARGARDT DISEASE 5; STGD5","url":"https://www.omim.org/entry/621259"},{"mim_id":"612131","title":"SHORT-CHAIN DEHYDROGENASE/REDUCTASE FAMILY, MEMBER 9; DHRS9","url":"https://www.omim.org/entry/612131"},{"mim_id":"611731","title":"APC REGULATOR OF WNT SIGNALING PATHWAY; APC","url":"https://www.omim.org/entry/611731"},{"mim_id":"609769","title":"SHORT-CHAIN DEHYDROGENASE/REDUCTASE FAMILY 9C, MEMBER 7; SDR9C7","url":"https://www.omim.org/entry/609769"},{"mim_id":"608830","title":"RETINOL DEHYDROGENASE 12; RDH12","url":"https://www.omim.org/entry/608830"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Vesicles","reliability":"Uncertain"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"adipose tissue","ntpm":88.7},{"tissue":"liver","ntpm":55.1}],"url":"https://www.proteinatlas.org/search/RDH5"},"hgnc":{"alias_symbol":["HSD17B9","SDR9C5"],"prev_symbol":["RDH1"]},"alphafold":{"accession":"Q92781","domains":[{"cath_id":"3.40.50.720","chopping":"24-209_258-310","consensus_level":"medium","plddt":97.2055,"start":24,"end":310}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92781","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q92781-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q92781-F1-predicted_aligned_error_v6.png","plddt_mean":96.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=RDH5","jax_strain_url":"https://www.jax.org/strain/search?query=RDH5"},"sequence":{"accession":"Q92781","fasta_url":"https://rest.uniprot.org/uniprotkb/Q92781.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q92781/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92781"}},"corpus_meta":[{"pmid":"11053295","id":"PMC_11053295","title":"A high association with cone dystrophy in Fundus albipunctatus caused by mutations of the RDH5 gene.","date":"2000","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/11053295","citation_count":87,"is_preprint":false},{"pmid":"17435174","id":"PMC_17435174","title":"Altered vitamin A homeostasis and increased size and adiposity in the rdh1-null mouse.","date":"2007","source":"FASEB journal : official publication of the Federation of American Societies for Experimental Biology","url":"https://pubmed.ncbi.nlm.nih.gov/17435174","citation_count":77,"is_preprint":false},{"pmid":"9931293","id":"PMC_9931293","title":"Activity of human 11-cis-retinol dehydrogenase (Rdh5) with steroids and retinoids and expression of its mRNA in extra-ocular human tissue.","date":"1999","source":"The Biochemical journal","url":"https://pubmed.ncbi.nlm.nih.gov/9931293","citation_count":74,"is_preprint":false},{"pmid":"21529959","id":"PMC_21529959","title":"Phenotypic variability in RDH5 retinopathy (Fundus Albipunctatus).","date":"2011","source":"Ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/21529959","citation_count":73,"is_preprint":false},{"pmid":"11418621","id":"PMC_11418621","title":"Characterization of a dehydrogenase activity responsible for oxidation of 11-cis-retinol in the retinal pigment epithelium of mice with a disrupted RDH5 gene. A model for the human hereditary disease fundus albipunctatus.","date":"2001","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11418621","citation_count":62,"is_preprint":false},{"pmid":"15790919","id":"PMC_15790919","title":"Cone and rod dysfunction in fundus albipunctatus with RDH5 mutation: an electrophysiological study.","date":"2005","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/15790919","citation_count":42,"is_preprint":false},{"pmid":"12906118","id":"PMC_12906118","title":"RDH5 gene mutations and electroretinogram in fundus albipunctatus with or without macular dystrophy: RDH5 mutations and ERG in fundus albipunctatus.","date":"2003","source":"Documenta ophthalmologica. 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structure and minimal promoter of mouse rdh1.","date":"2003","source":"Gene","url":"https://pubmed.ncbi.nlm.nih.gov/12594048","citation_count":3,"is_preprint":false},{"pmid":"35433063","id":"PMC_35433063","title":"A Novel Pathogenic Variant in the RDH5 Gene in a Patient with Fundus Albipunctatus and Severe Macular Atrophy.","date":"2022","source":"Case reports in genetics","url":"https://pubmed.ncbi.nlm.nih.gov/35433063","citation_count":3,"is_preprint":false},{"pmid":"35148716","id":"PMC_35148716","title":"Novel variants in the RDH5 Gene in a Chinese Han family with fundus albipunctatus.","date":"2022","source":"BMC ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/35148716","citation_count":2,"is_preprint":false},{"pmid":"37384328","id":"PMC_37384328","title":"Selection signature analysis reveals RDH5 performed key function in vision during sheep domestication process.","date":"2023","source":"Archives animal breeding","url":"https://pubmed.ncbi.nlm.nih.gov/37384328","citation_count":2,"is_preprint":false},{"pmid":"41679585","id":"PMC_41679585","title":"Fundus albipunctatus disease-associated RDH5/L310delinsEV mutation undertakes AMFR-mediated polyubiquitination and degradation in proteasome.","date":"2026","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/41679585","citation_count":0,"is_preprint":false},{"pmid":"31933420","id":"PMC_31933420","title":"A founder RDH5 splice site mutation leads to retinitis punctata albescens in two inbred Pakistani kindreds.","date":"2020","source":"Ophthalmic genetics","url":"https://pubmed.ncbi.nlm.nih.gov/31933420","citation_count":0,"is_preprint":false},{"pmid":"33610152","id":"PMC_33610152","title":"[Fundus albipunctatus with mutations in the RDH5 gene (clinical case)].","date":"2021","source":"Vestnik oftalmologii","url":"https://pubmed.ncbi.nlm.nih.gov/33610152","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.07.28.666396","title":"Multi-omic analyses identify molecular targets of Chd7 that mediate CHARGE syndrome model phenotypes","date":"2025-07-29","source":"bioRxiv","url":"https://doi.org/10.1101/2025.07.28.666396","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":21442,"output_tokens":3100,"usd":0.055413,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10458,"output_tokens":2918,"usd":0.06262,"stage2_stop_reason":"end_turn"},"total_usd":0.118033,"stage1_batch_id":"msgbatch_01CNoDbkChHEkgrJnL7BwtGJ","stage2_batch_id":"msgbatch_016Y4x9E9Wg5VQDANj9quSQD","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1999,\n      \"finding\": \"Recombinant human RDH5 catalyzes oxidation of 9-cis-retinol and 11-cis-retinol with equal efficiency, and also displays 3α-hydroxysteroid dehydrogenase activity recognizing 5α-androstan-3α,17β-diol and androsterone as substrates, but lacks 17β-hydroxysteroid and 11β-hydroxysteroid dehydrogenase activities (no activity toward testosterone, dihydrotestosterone, estradiol, or corticosterone).\",\n      \"method\": \"In vitro enzymatic assay with recombinant human RDH5\",\n      \"journal\": \"The Biochemical Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro enzymatic assay with recombinant protein, multiple substrates tested with positive and negative results in a single focused study\",\n      \"pmids\": [\"9931293\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"RDH5 encodes the dehydrogenase responsible for the majority of 11-cis-retinol oxidation to 11-cis-retinal in the retinal pigment epithelium (RPE). In Rdh5-/- mice, lack of RDH5 leads to accumulation of cis-retinoids (particularly 13-cis-isomers) after a bleach. Remaining RPE microsomal RDH activity in knockout mice is NADP-dependent and specific for 9-cis- and 11-cis-retinal but not 13-cis-retinal, explaining the 13-cis-isomer accumulation.\",\n      \"method\": \"Rdh5 knockout mouse model; retinoid analysis after bleach; microsomal enzymatic activity assays from RPE\",\n      \"journal\": \"The Journal of Biological Chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic knockout with biochemical characterization of retinoid accumulation and enzymatic activity in isolated RPE microsomes, replicated mechanistic conclusions in animal model\",\n      \"pmids\": [\"11418621\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Mouse Rdh1 (ortholog of human RDH5/RDH1) metabolizes retinoids in vivo: Rdh1-null mice show decreased liver Cyp26a1 mRNA and protein and increased liver and kidney retinoid stores on vitamin A-restricted diets, indicating Rdh1 generates all-trans-retinoic acid in vivo and that Cyp26a1 expression is regulated downstream of Rdh1 activity.\",\n      \"method\": \"Rdh1 knockout mouse (homologous recombination); retinoid quantification; qRT-PCR and Western blot for Cyp26a1\",\n      \"journal\": \"FASEB Journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with multiple orthogonal readouts (retinoid stores, Cyp26a1 mRNA, Cyp26a1 protein) in a single study\",\n      \"pmids\": [\"17435174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Mouse Rdh1 (RDH1/RDH5 alias) contributes to all-trans-retinoic acid biosynthesis: RDH1 recognizes all-trans-retinol, 9-cis-retinol, 5α-androstan-3,17-diol, and 5α-androstan-3-ol-17-one as substrates and, when co-expressed with any of three retinal dehydrogenases in reporter cells, reconstitutes a path of all-trans-retinoic acid biosynthesis. RDH1 is the most efficient known mouse short-chain dehydrogenase for dehydrogenation of all-trans-retinol.\",\n      \"method\": \"Reconstituted all-trans-retinoic acid biosynthesis in reporter cells (co-expression with retinal dehydrogenases); substrate specificity assays\",\n      \"journal\": \"Gene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — reconstitution of retinoic acid biosynthesis pathway in cells plus enzymatic substrate profiling in a single focused study\",\n      \"pmids\": [\"12594048\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MITF (microphthalmia-associated transcription factor) directly regulates Rdh5 expression in the RPE: Rdh5 mRNA is downregulated in optic cups and presumptive RPE of Mitf-deficient mouse embryos, and experimental manipulation of MITF levels in human RPE cells in culture causes corresponding changes in endogenous RDH5 levels.\",\n      \"method\": \"Mitf-knockout mouse embryos; MITF overexpression/knockdown in human RPE cells; qRT-PCR/Western blot for RDH5\",\n      \"journal\": \"Scientific Reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic model plus cell-based gain/loss-of-function, two orthogonal approaches, single lab\",\n      \"pmids\": [\"26876013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Rdh1 (mouse ortholog)-generated all-trans-retinoic acid (atRA) in brown adipose tissue (BAT) regulates multiple genes promoting BAT adaptation to fasting and re-feeding. Rdh1 ablation eliminates the re-feeding-induced increase in BAT atRA, increases fatty acid uptake, attenuates lipolysis in primary brown adipocytes, reduces mitochondrial proteins (CYCS, UCP1), decreases mitochondrial oxygen consumption rate, and disrupts mitochondrial membrane potential, resulting in BAT and white adipose hypertrophy.\",\n      \"method\": \"Rdh1-null mouse model; primary brown adipocyte assays; RNAseq; mitochondrial function assays; retinoid quantification in BAT\",\n      \"journal\": \"Cellular and Molecular Life Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with multiple orthogonal functional readouts (retinoid measurements, primary cell assays, RNAseq, mitochondrial function), single lab\",\n      \"pmids\": [\"30788515\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A homozygous p.Tyr175Phe mutation in RDH5 causes fundus albipunctatus. The invariant tyrosine at position 175, one of the most conserved residues in short-chain dehydrogenase/reductase (SDR) enzymes, is crucial for RDH5 catalytic activity; substitution at this position is predicted and contextually established to abolish enzymatic function.\",\n      \"method\": \"Patient DNA sequencing; structural/functional context of the invariant SDR tyrosine\",\n      \"journal\": \"Journal of Applied Genetics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — mutation identification in a patient with bioinformatic/structural inference of functional consequence; no direct enzymatic assay of the mutant protein performed\",\n      \"pmids\": [\"25820994\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"All-trans retinoic acid (ATRA) inhibits RDH5 mRNA expression in ARPE-19 RPE cells in a dose-dependent manner, and siRNA-mediated knockdown of RDH5 significantly upregulates MMP-2 and TGF-β2 mRNA expression, suggesting RDH5 suppresses MMP-2 and TGF-β2 in RPE cells and may inhibit epithelial-mesenchymal transition.\",\n      \"method\": \"ATRA dose-response in ARPE-19 cells; siRNA knockdown of RDH5; qRT-PCR for RDH5, MMP-2, TGF-β2\",\n      \"journal\": \"International Journal of Ophthalmology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — siRNA knockdown with qRT-PCR readouts in cell line, two orthogonal perturbations (ATRA and siRNA), single lab\",\n      \"pmids\": [\"37332553\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"The FA-associated RDH5/L310delinsEV mutant protein has a shortened half-life compared to wild-type RDH5. Unlike wild-type RDH5, which is degraded via autophagy-lysosomes, the L310delinsEV mutant is reduced in its localization to the endoplasmic reticulum and is instead polyubiquitinated and degraded via the ubiquitin-proteasome pathway. Both wild-type and mutant RDH5 interact with AMFR (an E3 ubiquitin ligase on the ER). AMFR overexpression increases and AMFR knockdown decreases degradation of L310delinsEV. The polyubiquitination sites on the mutant are Lys179 and Lys263; K179R/K263R double mutation reduces AMFR-mediated polyubiquitination and degradation.\",\n      \"method\": \"Half-life assay (pulse-chase/CHX); subcellular fractionation/localization; co-immunoprecipitation (AMFR-RDH5 interaction); AMFR overexpression and siRNA knockdown; site-directed mutagenesis (K179R, K263R); ubiquitination assays\",\n      \"journal\": \"Experimental Eye Research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal methods including co-IP, mutagenesis of ubiquitination sites, genetic gain/loss of E3 ligase, and pathway (autophagy vs. proteasome) discrimination in a single focused study\",\n      \"pmids\": [\"41679585\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"A missense mutation c.T722C/p.M241T in sheep RDH5 (exon 4) reduces retinol dehydrogenase activity encoded by RDH5, impairing retinoic acid metabolism and influencing the visual cycle.\",\n      \"method\": \"Whole genome resequencing; identification of missense variant; functional inference from reduced retinol dehydrogenase activity (reported as measured result for the sheep variant)\",\n      \"journal\": \"Archives Animal Breeding\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — activity reduction reported for a sheep RDH5 variant in a domestication/selection context study; minimal methodological detail in abstract\",\n      \"pmids\": [\"37384328\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"RDH5 (also known as RDH1/SDR9C5) is an endoplasmic reticulum-resident short-chain dehydrogenase/reductase that catalyzes the oxidation of 11-cis-retinol (and 9-cis-retinol) to the corresponding retinaldehydes as the final step of visual chromophore regeneration in the RPE, with its expression controlled by the transcription factor MITF; it also contributes to all-trans-retinoic acid biosynthesis in peripheral tissues by oxidizing all-trans-retinol, thereby regulating downstream retinoic acid-responsive gene expression including CYP26A1, and its disease-associated L310delinsEV mutant undergoes accelerated AMFR E3 ligase-mediated ubiquitination at Lys179/Lys263 and proteasomal degradation rather than the normal autophagy-lysosomal route, explaining the protein loss seen in fundus albipunctatus.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RDH5 (also termed RDH1) is an endoplasmic reticulum short-chain dehydrogenase/reductase that oxidizes cis- and all-trans-retinols, supplying retinaldehyde for both visual chromophore regeneration and retinoic acid biosynthesis [#0, #3]. In the retinal pigment epithelium it carries out the majority of 11-cis-retinol oxidation to 11-cis-retinal; its loss in knockout mice causes accumulation of cis-retinoids (particularly 13-cis isomers) following a bleach, leaving only a residual NADP-dependent activity that does not handle 13-cis substrates [#1]. The enzyme also accepts 9-cis-retinol and several 3-hydroxysteroids while lacking 17β- and 11β-hydroxysteroid dehydrogenase activity [#0]. In peripheral tissues RDH5/RDH1 is the most efficient short-chain dehydrogenase for all-trans-retinol and, acting upstream of retinal dehydrogenases, generates all-trans-retinoic acid that regulates downstream gene expression including CYP26A1 and a brown-adipose program of mitochondrial and lipid-handling genes [#2, #3, #5]. RDH5 expression is directly controlled by the transcription factor MITF in the RPE [#4]. Mutations in RDH5 cause fundus albipunctatus [#6]; the disease-associated L310delinsEV mutant has reduced ER localization and a shortened half-life, being diverted from the normal autophagy-lysosomal route into AMFR-mediated polyubiquitination at Lys179/Lys263 and proteasomal degradation [#8].\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Established the catalytic identity of human RDH5 by defining its retinoid and steroid substrate preferences, distinguishing it from related hydroxysteroid dehydrogenases.\",\n      \"evidence\": \"In vitro enzymatic assays with recombinant human RDH5 across multiple retinoid and steroid substrates\",\n      \"pmids\": [\"9931293\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish the in vivo physiological substrate or tissue context\", \"No structural basis for substrate selectivity\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Demonstrated that RDH5 accounts for most 11-cis-retinol oxidation in the RPE, placing it at the final oxidation step of visual chromophore regeneration.\",\n      \"evidence\": \"Rdh5 knockout mouse with post-bleach retinoid analysis and RPE microsomal activity assays\",\n      \"pmids\": [\"11418621\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the residual NADP-dependent RDH activity not resolved\", \"Did not address retinoic acid roles outside the eye\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed RDH5/RDH1 acts upstream of retinal dehydrogenases to reconstitute all-trans-retinoic acid biosynthesis, extending its role beyond the visual cycle.\",\n      \"evidence\": \"Reconstituted atRA biosynthesis in reporter cells co-expressing retinal dehydrogenases; substrate profiling\",\n      \"pmids\": [\"12594048\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In-cell reconstitution did not confirm endogenous flux in tissue\", \"Relative contribution versus other retinol dehydrogenases unquantified\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Confirmed in vivo that RDH1/RDH5 generates all-trans-retinoic acid and feeds the CYP26A1-controlled retinoid catabolism axis.\",\n      \"evidence\": \"Rdh1-null mice with retinoid quantification and Cyp26a1 mRNA/protein measurement under vitamin A restriction\",\n      \"pmids\": [\"17435174\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tissue-specific contributions not dissected\", \"Direct enzymatic flux not measured in intact tissue\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified MITF as a direct upstream transcriptional regulator of RDH5 in the RPE, linking RPE identity to chromophore-regeneration capacity.\",\n      \"evidence\": \"Mitf-knockout mouse embryos and MITF gain/loss-of-function in human RPE cells with RDH5 readouts\",\n      \"pmids\": [\"26876013\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct MITF promoter occupancy at RDH5 not shown\", \"Single-lab evidence\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended RDH1/RDH5 atRA function to brown adipose tissue, showing it controls a fasting/re-feeding mitochondrial and lipid-handling gene program.\",\n      \"evidence\": \"Rdh1-null mice, primary brown adipocyte assays, RNAseq, mitochondrial function and retinoid measurements\",\n      \"pmids\": [\"30788515\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Specific atRA target genes mediating the BAT phenotype not fully mapped\", \"Cross-species relevance to human adipose unaddressed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked an invariant SDR active-site tyrosine (Tyr175) mutation in RDH5 to fundus albipunctatus, implicating loss of catalysis in disease.\",\n      \"evidence\": \"Patient DNA sequencing with structural/contextual inference on the conserved SDR tyrosine\",\n      \"pmids\": [\"25820994\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct enzymatic assay of the mutant protein performed\", \"Functional consequence is inferred rather than measured\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Connected RDH5 levels to RPE epithelial-mesenchymal phenotype, with atRA repressing RDH5 and RDH5 loss raising MMP-2 and TGF-β2.\",\n      \"evidence\": \"ATRA dose-response and siRNA knockdown of RDH5 in ARPE-19 cells with qRT-PCR\",\n      \"pmids\": [\"37332553\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Effects shown at mRNA level only; protein and functional EMT not demonstrated\", \"Mechanism linking RDH5 to MMP-2/TGF-β2 unknown\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Defined why the fundus albipunctatus L310delinsEV mutant is lost, showing a switch from autophagy-lysosomal turnover to AMFR-driven proteasomal degradation.\",\n      \"evidence\": \"Half-life/CHX assays, fractionation, AMFR co-IP, AMFR gain/loss, and K179R/K263R mutagenesis with ubiquitination assays\",\n      \"pmids\": [\"41679585\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether mutant retains any catalytic activity before degradation untested\", \"Trigger for diverting the mutant away from the ER not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RDH5 substrate flux is partitioned between visual-cycle cis-retinol oxidation and peripheral all-trans-retinoic acid production across tissues remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model explaining dual retinoid/steroid substrate handling\", \"Quantitative tissue-level partitioning of RDH5 activity unestablished\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016491\", \"supporting_discovery_ids\": [0, 1, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"R-HSA-1430728\", \"supporting_discovery_ids\": [2, 3, 5]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"AMFR\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}