{"gene":"ROMO1","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":2006,"finding":"ROMO1 (Reactive oxygen species modulator 1) is a novel protein localized in the mitochondria that increases cellular ROS levels when overexpressed.","method":"Subcellular fractionation/localization; overexpression with ROS measurement","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiment plus functional overexpression assay, single lab, foundational study","pmids":["16842742"],"is_preprint":false},{"year":2010,"finding":"In response to TNF-alpha, TNF complex II (comprising RIP1, TRADD, TRAF2, FADD, and pro-caspase-8) binds to the C-terminus of mitochondrial ROMO1. ROMO1 then recruits BCL-XL to reduce mitochondrial membrane potential, resulting in ROS production and apoptotic cell death, establishing ROMO1 as a molecular bridge between TNF-alpha signaling and mitochondrial ROS production.","method":"Co-immunoprecipitation, binding domain mapping, siRNA knockdown with apoptosis and ROS readouts","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP with defined domain mapping, single lab, multiple functional readouts","pmids":["20203691"],"is_preprint":false},{"year":2010,"finding":"ROMO1 knockdown by siRNA blocks mitochondrial ROS production caused by serum deprivation (originating in the mitochondrial electron transport chain) and inhibits serum deprivation-induced apoptosis.","method":"siRNA knockdown, mitochondrial ROS measurement, apoptosis assay","journal":"Apoptosis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KD with defined cellular phenotype (ROS and apoptosis), single lab, two orthogonal readouts","pmids":["19904609"],"is_preprint":false},{"year":2008,"finding":"ROMO1-derived ROS are required for normal cell proliferation; ROMO1 knockdown reduces ROS and inhibits cell growth via the ERK pathway, which can be rescued by exogenous hydrogen peroxide.","method":"siRNA knockdown, ERK pathway inhibition, exogenous H2O2 rescue experiment","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with pathway rescue experiment, single lab, epistatic placement in ERK pathway","pmids":["18313394"],"is_preprint":false},{"year":2008,"finding":"Enforced ROMO1 expression triggers premature senescence and DNA damage via ROS production originating in the mitochondrial electron transport chain; endogenous ROMO1 expression increases with replicative age in IMR-90 fibroblasts and ROMO1 knockdown inhibits replicative senescence progression.","method":"Overexpression, siRNA knockdown, ROS measurement, senescence assays (SA-β-gal), DNA damage markers","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD and OE with multiple orthogonal phenotypic readouts, single lab","pmids":["18836179"],"is_preprint":false},{"year":2009,"finding":"Endogenous ROMO1-derived mitochondrial ROS are required for G1-to-S cell cycle transition in normal WI-38 fibroblasts; ROMO1 knockdown reduces ROS and causes G1 arrest associated with increased p27(Kip1) levels.","method":"siRNA knockdown, flow cytometry cell cycle analysis, p27(Kip1) western blot, ROS measurement","journal":"Free radical research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with cell cycle and molecular marker readouts, single lab, pathway placement via p27(Kip1)","pmids":["19513905"],"is_preprint":false},{"year":2011,"finding":"Upregulated MYC induces ROMO1 expression; in a negative-feedback loop, ROMO1-derived ROS stimulate SKP2-mediated ubiquitylation and proteasomal degradation of MYC in normal lung fibroblasts. Additionally, pre-existing ROMO1-derived ROS are required for MYC induction and quiescent cell cycle re-entry.","method":"Overexpression, siRNA knockdown, ubiquitylation assay, western blot for Myc/Skp2, cell cycle analysis","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple mechanistic assays (ubiquitylation, pathway placement), single lab","pmids":["21558421"],"is_preprint":false},{"year":2011,"finding":"BCL-XL expression blocks serum deprivation-induced and ROMO1-triggered ROS generation and apoptotic cell death, indicating BCL-XL acts downstream of or in parallel to ROMO1 to suppress oxidative stress.","method":"BCL-XL overexpression, ROS measurement, apoptosis assay, epistasis with ROMO1","journal":"Oncology reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single overexpression approach with limited mechanistic detail in abstract","pmids":["21399876"],"is_preprint":false},{"year":2013,"finding":"ROMO1 mediates mitochondrial ROS production through complex III of the mitochondrial electron transport chain and is required for apoptosis induced by oxidative stress (H2O2) in lung epithelial cells; ROMO1 knockdown suppresses cellular ROS and H2O2-induced cell death.","method":"siRNA knockdown, complex III identification, ROS measurement, cell death assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with specific complex III assignment and multiple functional readouts, single lab","pmids":["23867822"],"is_preprint":false},{"year":2014,"finding":"ROMO1 is required for mitochondrial fusion and normal cristae morphology; oxidative stress promotes formation of high-molecular-weight ROMO1 complexes; ROMO1 is essential for oligomerization of the inner membrane GTPase OPA1, which maintains cristae junction integrity. ROMO1 knockdown causes mitochondrial fragmentation, loss of cristae, impaired mitochondrial respiration, and increased sensitivity to cell death stimuli.","method":"Genome-wide RNAi screen, ROMO1 KD, native PAGE for OPA1 oligomers, electron microscopy of cristae, mitochondrial respiration assay, redox stress treatment","journal":"Science signaling","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide screen identification plus multiple orthogonal validation methods (native PAGE, EM, respiration), replicated across cell lines","pmids":["24473195"],"is_preprint":false},{"year":2014,"finding":"ROMO1 expression is required to maintain constitutive NF-κB nuclear DNA-binding activity and transcriptional activity via constitutive IκBα phosphorylation in hepatocellular carcinoma cells; ROMO1 overexpression promotes p65 nuclear translocation.","method":"siRNA knockdown, overexpression, NF-κB reporter assay, IκBα phosphorylation western blot, p65 nuclear translocation assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD and OE with pathway-level mechanistic readouts, single lab","pmids":["25044121"],"is_preprint":false},{"year":2015,"finding":"ROMO1-induced increase in invasive activity is blocked by an IKK inhibitor, demonstrating that ROMO1-driven tumor cell invasion is mediated through the NF-κB signaling pathway.","method":"siRNA knockdown, IKK inhibitor treatment, invasion assay","journal":"International journal of oncology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological epistasis with invasion phenotype, single lab","pmids":["25673177"],"is_preprint":false},{"year":2018,"finding":"ROMO1 is a constituent of the human TIM23 presequence translocase complex with an exceptionally short half-life. ROMO1 is not required for general presequence import but is specifically required for import of the inner membrane protease YME1L; in ROMO1 knockout cells, YME1L is lost from the inner membrane, leading to aberrant OPA1 processing and altered inner membrane structure. ROMO1 also participates in the dynamics of TIM21 during respiratory chain biogenesis.","method":"Mass spectrometry identification of TIM23 complex constituents, ROMO1 KO cell line analysis, import assays, OPA1 processing western blot, TIM21 dynamics analysis","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — mass spectrometry complex identification, KO cell line with multiple orthogonal mechanistic readouts (import assay, OPA1 processing, TIM21 dynamics), rigorous controls","pmids":["30598479"],"is_preprint":false},{"year":2018,"finding":"ROMO1 forms a nonselective cation channel with its amphipathic helical transmembrane domain necessary for pore-forming activity; structurally resembles class II viroporins; channel activity is specifically inhibited by Fe2+ ions. A hexameric structural model was constructed by experimental data-guided structural bioinformatics.","method":"Electrophysiology (channel recording), transmembrane domain mutagenesis, structural bioinformatics/modeling, Fe2+ inhibition assay","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct electrophysiological reconstitution of channel activity, domain mutagenesis, structural modeling with experimental validation","pmids":["29545371"],"is_preprint":false},{"year":2019,"finding":"SRA receptor stimulation activates ERK phosphorylation, which upregulates and activates ROMO1 to enhance mitochondrial ROS production and promote NETs formation in neutrophils; inhibition of ROMO1 dampens SRA-stimulated NET release.","method":"Pharmacological inhibition, siRNA knockdown, ERK inhibition, ROS measurement, NET assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistatic placement of ROMO1 downstream of ERK in SRA-NETs pathway, single lab, inhibitor and KD approaches","pmids":["30850160"],"is_preprint":false},{"year":2020,"finding":"ROMO1 overexpression in bone marrow cells results in M2 polarization of bone marrow-derived macrophages through the mTORC1 signaling pathway.","method":"Overexpression in bone marrow cells, glioblastoma mouse model, macrophage polarization assay, mTORC1 pathway analysis","journal":"Aging","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, in vivo model with pathway inference, limited mechanistic detail in abstract","pmids":["31945745"],"is_preprint":false},{"year":2020,"finding":"ROMO1 inhibition elevates BAX protein levels by downregulating the ubiquitin-proteasome system and downregulates the interaction between BAX and Parkin, thereby sensitizing colorectal cancer cells to TRAIL-mediated mitochondrial apoptosis.","method":"siRNA knockdown, western blot for BAX and ubiquitin-proteasome components, Co-IP for BAX-Parkin interaction, TRAIL apoptosis assay, xenograft model","journal":"Cancers","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with Co-IP interaction mapping and in vivo validation, single lab","pmids":["32825500"],"is_preprint":false},{"year":2021,"finding":"ROMO1 knockdown in porcine preimplantation embryos disrupts OPA1 isoform balance, leading to cytochrome c release, reduced ATP, mitochondrial fragmentation, decreased mitochondrial membrane potential, increased ROS production, and induction of apoptosis; ROMO1 overexpression rescues these defects.","method":"siRNA knockdown, overexpression rescue, OPA1 western blot, cytochrome c release assay, ATP measurement, mitochondrial morphology imaging","journal":"Cell division","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD and OE rescue with multiple molecular readouts, consistent with mammalian findings, single lab","pmids":["34915903"],"is_preprint":false},{"year":2023,"finding":"TRAF2 deficiency increases ROMO1 expression, which activates the NAD+/SIRT3/SOD2 pathway to promote ROS production, cause mitochondrial dysfunction, and trigger DNA damage response leading to hepatocellular carcinoma senescence.","method":"TRAF2 knockdown/KO, ROMO1 western blot, NAD+/SIRT3/SOD2 pathway analysis, mitochondrial function assays, DNA damage markers","journal":"Free radical biology & medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with molecular pathway placement, single lab, multiple readouts","pmids":["38043870"],"is_preprint":false},{"year":2023,"finding":"PKLR undergoes nuclear translocation under androgen-deprivation conditions and binds to the MYCN/MAX complex to upregulate ROMO1 expression; elevated ROMO1 alters mitochondrial function and promotes neuroendocrine differentiation of prostate cancer cells.","method":"Nuclear fractionation, Co-IP for PKLR-MYCN/MAX complex, ROMO1 western blot, mitochondrial function assays, NE differentiation markers","journal":"Redox biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with nuclear fractionation and functional pathway readouts, single lab","pmids":["36963289"],"is_preprint":false},{"year":2025,"finding":"ROMO1 overexpression causes a reductive shift in the mitochondrial cysteinome, protecting mitochondrial proteinaceous thiols from oxidation; this promotes energy metabolism and Ca2+ uniport while inhibiting mitochondrial permeability transition. ROMO1 overexpression reverses cysteinome oxidations in aged mice and slows functional decline.","method":"Redox proteomics of mitochondrial cysteinome, ROMO1 overexpression in cells and aged mice, mitochondrial respiration assay, Ca2+ uniport measurement, mPTP assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — redox proteomics with multiple orthogonal mechanistic readouts (energy metabolism, Ca2+ uniport, mPTP), in vivo validation in aged mice","pmids":["40461459"],"is_preprint":false},{"year":2026,"finding":"ROMO1 is essential for embryonic development (Romo1-null mice die before embryonic day 8.5); conditional ROMO1 knockout in pancreatic beta cells impairs glucose-stimulated insulin secretion and reduces spare respiratory capacity by specifically decreasing complex II/succinate dehydrogenase activity; human islets lacking ROMO1 also show reduced spare respiratory capacity.","method":"Whole-body and conditional (beta cell) Romo1 knockout mice, glucose tolerance test, insulin secretion assay, mitochondrial respiratory analysis (Seahorse), isolated human islets with ROMO1 KO","journal":"Diabetologia","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vivo conditional KO with translational validation in human islets, multiple orthogonal metabolic readouts","pmids":["41995846"],"is_preprint":false},{"year":2026,"finding":"ROMO1 silencing in airway epithelial cells suppresses cigarette smoke extract-induced mitochondrial ROS production, STAT6 phosphorylation, and MUC5AC (mucin) expression, placing ROMO1 upstream of a mitochondrial ROS-STAT6 pathway that drives airway mucus hypersecretion.","method":"siRNA knockdown, mitochondrial ROS measurement, STAT6 phosphorylation western blot, MUC5AC expression assay, mitochondrial targeted antioxidant and STAT6 inhibitor epistasis","journal":"Respiratory research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KD with pharmacological epistasis placing ROMO1 in defined pathway, single lab","pmids":["41673839"],"is_preprint":false},{"year":2025,"finding":"Selective depletion of ROMO1 in cholinergic neurons in mice causes adult-onset progressive locomotor deficits resembling ALS, with age-dependent motor neuron loss, axon degeneration, disrupted cholinergic transmission, neuromuscular junction denervation, and muscle atrophy; early mitochondrial cristae deformation precedes onset of ALS-like symptoms.","method":"Conditional KO in cholinergic neurons, behavioral locomotor assays, motor neuron counting, axon morphology, neuromuscular junction staining, electron microscopy of cristae","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with multiple orthogonal readouts and temporal dissection, preprint not yet peer-reviewed","pmids":[],"is_preprint":true},{"year":2024,"finding":"Structural modelling predicts ROMO1 forms a channel within the TIM23 core complex together with TIM17, providing an alternative import channel for PINK1 translocation into the matrix; ROMO1/TIM17 and PARL/TIM17 interactions are mutually exclusive, with PINK1 TMD structural plasticity (α-helix vs α/β-hybrid) determining whether it is translocated through the ROMO1/TIM17 channel or cleaved by PARL.","method":"Structural modelling, PINK1 import analysis in intact cells, transmembrane domain structural prediction","journal":"bioRxiv","confidence":"Low","confidence_rationale":"Tier 4 / Weak — primarily computational structural modelling with limited direct biochemical validation; preprint","pmids":[],"is_preprint":true},{"year":2026,"finding":"ROMO1 is the most significantly downregulated mitochondrial protein at 24 hours post-high-dose irradiation in keratinocytes; ROMO1 overexpression increases mtROS and mitochondrial membrane potential but suppresses cell viability after radiation; skin-specific Romo1 knockout mice show accelerated wound healing and enhanced tissue regeneration after radiation injury.","method":"Mitochondrial proteomics, ROMO1 overexpression, Romo1 skin-specific KO mice, ROS and membrane potential measurement, wound healing and skin injury scoring","journal":"Journal of Sichuan University. Medical science edition","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomics identification plus OE and KO in vivo with multiple functional readouts, single lab","pmids":["42021879"],"is_preprint":false}],"current_model":"ROMO1 is a nuclear-encoded inner mitochondrial membrane protein that functions as a nonselective cation channel (structurally resembling class II viroporins, inhibited by Fe2+), acts as a redox sensor forming high-molecular-weight complexes under oxidative stress, and serves as an essential regulator of mitochondrial dynamics by supporting OPA1 oligomerization for cristae junction integrity and mitochondrial fusion; it is also a constituent of the human TIM23 presequence translocase specifically required for YME1L protease import, mediates ROS production through mitochondrial electron transport chain complex III (in part by protecting the mitochondrial cysteinome), and acts as a molecular bridge linking extramitochondrial signals (TNF-alpha via TNF complex II, Myc, PKLR/MYCN, DKK1, TRAF2) to mitochondrial ROS output that governs cell proliferation, apoptosis, senescence, NF-κB activation, and, in vivo, embryonic development, pancreatic beta-cell spare respiratory capacity at complex II/SDH, and motor neuron integrity."},"narrative":{"mechanistic_narrative":"ROMO1 is a nuclear-encoded inner mitochondrial membrane protein that couples mitochondrial reactive oxygen species (ROS) output to cell proliferation, apoptosis, senescence, and mitochondrial architecture [PMID:16842742, PMID:18836179, PMID:24473195]. It forms a nonselective cation channel through an amphipathic helical transmembrane domain, structurally resembling class II viroporins and inhibited by Fe2+ ions [PMID:29545371]. ROMO1 generates ROS through electron transport chain complex III and is required for ROS-dependent cellular outcomes including normal proliferation via the ERK pathway, G1-to-S transition, replicative senescence, and oxidative-stress-induced apoptosis [PMID:23867822, PMID:18313394, PMID:19513905, PMID:18836179]. As an essential regulator of mitochondrial dynamics, ROMO1 supports OPA1 oligomerization to maintain cristae junction integrity and mitochondrial fusion, with its loss causing mitochondrial fragmentation, cristae collapse, and impaired respiration [PMID:24473195]. ROMO1 is a constituent of the human TIM23 presequence translocase specifically required for import of the inner-membrane protease YME1L, whose loss in ROMO1-null cells causes aberrant OPA1 processing [PMID:30598479]. Beyond intrinsic mitochondrial functions, ROMO1 serves as a molecular bridge transmitting extramitochondrial signals to mitochondrial ROS: TNF-alpha via TNF complex II [PMID:20203691], MYC in a ROS-dependent negative-feedback loop [PMID:21558421], and TRAF2 deficiency or PKLR/MYCN inputs that drive senescence and neuroendocrine differentiation [PMID:38043870, PMID:36963289], with downstream effects on NF-κB activation and tumor cell invasion [PMID:25044121, PMID:25673177]. In vivo, ROMO1 is essential for embryonic development, supports pancreatic beta-cell spare respiratory capacity through complex II/succinate dehydrogenase, protects the mitochondrial cysteinome to sustain energy metabolism and limit the permeability transition, and maintains motor neuron integrity [PMID:41995846, PMID:40461459].","teleology":[{"year":2006,"claim":"Establishing that an uncharacterized mitochondrial protein could actively raise cellular ROS defined ROMO1 as a candidate ROS modulator rather than a passive bystander.","evidence":"Subcellular fractionation plus overexpression with ROS measurement","pmids":["16842742"],"confidence":"Medium","gaps":["No molecular mechanism for ROS generation identified","Source within mitochondria not localized"]},{"year":2008,"claim":"Linking ROMO1-derived ROS to proliferation and senescence showed the protein's ROS output is a physiological signal, not merely a damaging byproduct.","evidence":"siRNA knockdown and overexpression with ERK-pathway and senescence/DNA-damage readouts, H2O2 rescue","pmids":["18313394","18836179"],"confidence":"Medium","gaps":["Mechanism connecting ROMO1 to ERK not resolved","ROS-generating machinery not yet pinpointed"]},{"year":2009,"claim":"Demonstrating ROMO1-ROS requirement for G1-to-S transition placed the protein within cell-cycle control via p27(Kip1).","evidence":"siRNA knockdown, flow cytometry, p27 western blot, ROS measurement in fibroblasts","pmids":["19513905"],"confidence":"Medium","gaps":["Direct molecular link from ROS to p27 regulation not defined"]},{"year":2010,"claim":"Identifying TNF complex II binding to the ROMO1 C-terminus established ROMO1 as a bridge translating extramitochondrial death signals into mitochondrial ROS and apoptosis.","evidence":"Co-IP, domain mapping, siRNA knockdown with ROS and apoptosis readouts; serum-deprivation ROS/apoptosis assays","pmids":["20203691","19904609"],"confidence":"Medium","gaps":["BCL-XL recruitment mechanism partially defined","Channel basis of ROS production unknown at this stage"]},{"year":2011,"claim":"Placing ROMO1 in a MYC negative-feedback loop and downstream of BCL-XL refined how proliferative and survival signals are tuned by its ROS output.","evidence":"Overexpression, knockdown, ubiquitylation assays, epistasis with BCL-XL","pmids":["21558421","21399876"],"confidence":"Medium","gaps":["BCL-XL finding is single-approach overexpression","Directness of ROS effect on SKP2/MYC ubiquitylation not biochemically isolated"]},{"year":2013,"claim":"Assigning ROMO1-dependent ROS to complex III gave a specific source within the electron transport chain for its oxidative output.","evidence":"siRNA knockdown with complex III identification, ROS and cell death assays in lung epithelial cells","pmids":["23867822"],"confidence":"Medium","gaps":["Whether ROMO1 acts on complex III directly or indirectly not resolved"]},{"year":2014,"claim":"Identifying ROMO1 as essential for OPA1 oligomerization and cristae integrity reframed it as a core regulator of mitochondrial dynamics, and linking it to NF-κB extended its signaling reach.","evidence":"Genome-wide RNAi screen, native PAGE for OPA1 oligomers, EM of cristae, respiration assays; NF-κB reporter and IκBα phosphorylation assays","pmids":["24473195","25044121"],"confidence":"High","gaps":["Molecular mechanism by which ROMO1 promotes OPA1 oligomerization not defined","Link between ROMO1 ROS and constitutive IκBα phosphorylation indirect"]},{"year":2018,"claim":"Reconstituting channel activity and defining ROMO1 as a TIM23 translocase constituent required for YME1L import provided two distinct biochemical activities and connected ROMO1 to OPA1 processing.","evidence":"Electrophysiology, TMD mutagenesis, structural modeling, Fe2+ inhibition; mass spectrometry of TIM23 complex, KO cells, import and OPA1-processing assays","pmids":["29545371","30598479"],"confidence":"High","gaps":["Relationship between channel activity and translocase function unresolved","How ROMO1 selects YME1L over other substrates not defined"]},{"year":2020,"claim":"Extending ROMO1 to immune and cancer contexts (macrophage polarization, BAX/Parkin-dependent TRAIL sensitization, NET formation) showed its ROS output shapes diverse cell-fate programs.","evidence":"Overexpression and knockdown with mTORC1, BAX-Parkin Co-IP, NET and apoptosis assays; xenograft/in vivo models","pmids":["31945745","32825500","30850160"],"confidence":"Medium","gaps":["mTORC1 polarization finding is low-confidence with limited mechanism","Directness of ROMO1 effects on each effector not isolated"]},{"year":2023,"claim":"Defining TRAF2- and PKLR/MYCN-driven ROMO1 induction connected upstream transcriptional inputs to ROMO1-dependent senescence and neuroendocrine differentiation.","evidence":"TRAF2 KO with NAD+/SIRT3/SOD2 pathway analysis; nuclear fractionation and Co-IP for PKLR-MYCN/MAX with NE differentiation markers","pmids":["38043870","36963289"],"confidence":"Medium","gaps":["Whether ROMO1 induction is the sole driver of these phenotypes not established"]},{"year":2025,"claim":"Showing ROMO1 protects the mitochondrial cysteinome reframed it as a guardian of proteinaceous thiols supporting energy metabolism, Ca2+ uniport, and resistance to permeability transition, with anti-aging effects in vivo.","evidence":"Redox proteomics, overexpression in cells and aged mice, respiration, Ca2+ uniport and mPTP assays","pmids":["40461459"],"confidence":"High","gaps":["Mechanism by which ROMO1 channel/redox activity drives cysteinome reduction not defined"]},{"year":2026,"claim":"In vivo knockout studies established ROMO1 as essential for embryogenesis, beta-cell respiratory capacity at complex II/SDH, and tissue contexts including airway mucus and radiation injury, demonstrating organismal-level requirement.","evidence":"Whole-body and conditional KO mice, human islet KO, Seahorse respirometry, glucose-stimulated insulin secretion; airway epithelial knockdown with STAT6/MUC5AC readouts; skin-specific KO with wound-healing scoring","pmids":["41995846","41673839","42021879"],"confidence":"High","gaps":["How ROMO1 loss specifically reduces complex II/SDH activity not mechanistically resolved","Tissue-specific divergent outcomes not unified mechanistically"]},{"year":null,"claim":"How ROMO1's channel activity, redox-sensing/cysteinome protection, and TIM23 translocase roles are mechanistically integrated into a single molecular function remains unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structure of ROMO1 within the assembled TIM23 complex","Causal hierarchy among channel, ROS-generation, and OPA1/cristae roles not established","Substrate-selection rules for the translocase function undefined"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005215","term_label":"transporter activity","supporting_discovery_ids":[13]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[9,20]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[12]}],"localization":[{"term_id":"GO:0005739","term_label":"mitochondrion","supporting_discovery_ids":[0,9,12]}],"pathway":[{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[5,6]},{"term_id":"R-HSA-5357801","term_label":"Programmed Cell Death","supporting_discovery_ids":[1,2,8,16]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[9,12]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[4,20]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[12]}],"complexes":["TIM23 presequence translocase"],"partners":["OPA1","YME1L","TRAF2","BCL-XL","TIM17","MYC"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P60602","full_name":"Reactive oxygen species modulator 1","aliases":["Epididymis tissue protein Li 175","Glyrichin","Mitochondrial targeting GxxxG motif protein","MTGM","Protein MGR2 homolog"],"length_aa":79,"mass_kda":8.2,"function":"Induces production of reactive oxygen species (ROS) which are necessary for cell proliferation. May play a role in inducing oxidative DNA damage and replicative senescence. May play a role in the coordination of mitochondrial morphology and cell proliferation Has antibacterial activity against a variety of bacteria including S.aureus, P.aeruginosa and M.tuberculosis. Acts by inducing bacterial membrane breakage","subcellular_location":"Mitochondrion inner membrane","url":"https://www.uniprot.org/uniprotkb/P60602/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/ROMO1","classification":"Common Essential","n_dependent_lines":1139,"n_total_lines":1208,"dependency_fraction":0.9428807947019867},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/ROMO1","total_profiled":1310},"omim":[{"mim_id":"618894","title":"REACTIVE OXYGEN SPECIES MODULATOR 1; ROMO1","url":"https://www.omim.org/entry/618894"},{"mim_id":"617392","title":"ECTODERMAL DYSPLASIA 13, HAIR/TOOTH TYPE; ECTD13","url":"https://www.omim.org/entry/617392"},{"mim_id":"609898","title":"KRINGLE DOMAIN-CONTAINING TRANSMEMBRANE PROTEIN 1; KREMEN1","url":"https://www.omim.org/entry/609898"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/ROMO1"},"hgnc":{"alias_symbol":["bA353C18.2","MTGMP"],"prev_symbol":["C20orf52"]},"alphafold":{"accession":"P60602","domains":[{"cath_id":"-","chopping":"15-77","consensus_level":"high","plddt":85.271,"start":15,"end":77}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P60602","model_url":"https://alphafold.ebi.ac.uk/files/AF-P60602-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P60602-F1-predicted_aligned_error_v6.png","plddt_mean":78.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ROMO1","jax_strain_url":"https://www.jax.org/strain/search?query=ROMO1"},"sequence":{"accession":"P60602","fasta_url":"https://rest.uniprot.org/uniprotkb/P60602.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P60602/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P60602"}},"corpus_meta":[{"pmid":"20203691","id":"PMC_20203691","title":"TNF-alpha-induced ROS production triggering apoptosis is directly linked to Romo1 and Bcl-X(L).","date":"2010","source":"Cell death and differentiation","url":"https://pubmed.ncbi.nlm.nih.gov/20203691","citation_count":301,"is_preprint":false},{"pmid":"16842742","id":"PMC_16842742","title":"A novel protein, Romo1, induces ROS production in the mitochondria.","date":"2006","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/16842742","citation_count":113,"is_preprint":false},{"pmid":"24473195","id":"PMC_24473195","title":"ROMO1 is an essential redox-dependent regulator of mitochondrial dynamics.","date":"2014","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/24473195","citation_count":104,"is_preprint":false},{"pmid":"19904609","id":"PMC_19904609","title":"Serum deprivation-induced reactive oxygen species production is mediated by Romo1.","date":"2010","source":"Apoptosis : an international journal on programmed cell death","url":"https://pubmed.ncbi.nlm.nih.gov/19904609","citation_count":102,"is_preprint":false},{"pmid":"22749933","id":"PMC_22749933","title":"Overexpression of Romo1 promotes production of reactive oxygen species and invasiveness of hepatic tumor cells.","date":"2012","source":"Gastroenterology","url":"https://pubmed.ncbi.nlm.nih.gov/22749933","citation_count":70,"is_preprint":false},{"pmid":"18313394","id":"PMC_18313394","title":"A critical role for Romo1-derived ROS in cell proliferation.","date":"2008","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/18313394","citation_count":70,"is_preprint":false},{"pmid":"18836179","id":"PMC_18836179","title":"Replicative senescence induced by Romo1-derived reactive oxygen species.","date":"2008","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/18836179","citation_count":60,"is_preprint":false},{"pmid":"30598479","id":"PMC_30598479","title":"ROMO1 is a 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overexpression protects the mitochondrial cysteinome from oxidations in aging.","date":"2025","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/40461459","citation_count":7,"is_preprint":false},{"pmid":"36245774","id":"PMC_36245774","title":"The Association of Oxidative Stress and Reactive Oxygen Species Modulator 1 (ROMO1) with Infertility: A Mini Review.","date":"2022","source":"Chonnam medical journal","url":"https://pubmed.ncbi.nlm.nih.gov/36245774","citation_count":7,"is_preprint":false},{"pmid":"41148844","id":"PMC_41148844","title":"HPV Oncoproteins and Mitochondrial Reprogramming: The Central Role of ROMO1 in Oxidative Stress and Metabolic Shifts.","date":"2025","source":"Cells","url":"https://pubmed.ncbi.nlm.nih.gov/41148844","citation_count":4,"is_preprint":false},{"pmid":"33302957","id":"PMC_33302957","title":"The C allele of the reactive oxygen species modulator 1 (ROMO1) polymorphism rs6060566 is a biomarker predicting coronary artery stenosis in Slovenian subjects with type 2 diabetes mellitus.","date":"2020","source":"BMC medical genomics","url":"https://pubmed.ncbi.nlm.nih.gov/33302957","citation_count":4,"is_preprint":false},{"pmid":"37285738","id":"PMC_37285738","title":"The effects of ROMO1 on cervical cancer progression.","date":"2023","source":"Pathology, research and practice","url":"https://pubmed.ncbi.nlm.nih.gov/37285738","citation_count":3,"is_preprint":false},{"pmid":"40427422","id":"PMC_40427422","title":"ROMO1: A Distinct Mitochondrial Protein with Dual Roles in Dynamics and Function.","date":"2025","source":"Antioxidants (Basel, Switzerland)","url":"https://pubmed.ncbi.nlm.nih.gov/40427422","citation_count":2,"is_preprint":false},{"pmid":"34361008","id":"PMC_34361008","title":"A Novel Peptide Derived from the Transmembrane Domain of Romo1 Is a Promising Candidate for Sepsis Treatment and Multidrug-Resistant Bacteria.","date":"2021","source":"International journal of molecular 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Supplementband","url":"https://pubmed.ncbi.nlm.nih.gov/1706877","citation_count":1,"is_preprint":false},{"pmid":"34512752","id":"PMC_34512752","title":"High Expression of ROMO1 Aggravates the Malignancy of Hepatoblastoma.","date":"2021","source":"Journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/34512752","citation_count":0,"is_preprint":false},{"pmid":"41673839","id":"PMC_41673839","title":"ROMO1 is involved in airway mucus hypersecretion in COPD through the mitochondrial ROS-STAT6 pathway.","date":"2026","source":"Respiratory research","url":"https://pubmed.ncbi.nlm.nih.gov/41673839","citation_count":0,"is_preprint":false},{"pmid":"41995846","id":"PMC_41995846","title":"ROMO1 and mitochondrial complex II/SDH are required for spare respiratory capacity and glucose homeostasis in mice.","date":"2026","source":"Diabetologia","url":"https://pubmed.ncbi.nlm.nih.gov/41995846","citation_count":0,"is_preprint":false},{"pmid":"40747904","id":"PMC_40747904","title":"A machine learning-driven transcriptomic study reveals the key role of Romo1 in reversing central sensitization through stellate ganglion block in migraine: An interventional study based on a recurrent migraine rat model.","date":"2025","source":"Headache","url":"https://pubmed.ncbi.nlm.nih.gov/40747904","citation_count":0,"is_preprint":false},{"pmid":"42021879","id":"PMC_42021879","title":"[ROMO1 Promotes the Repair of Radiation-induced Skin Injury by Regulating Mitochondrial Function and Keratinocyte Proliferation].","date":"2026","source":"Sichuan da xue xue bao. Yi xue ban = Journal of Sichuan University. Medical science edition","url":"https://pubmed.ncbi.nlm.nih.gov/42021879","citation_count":0,"is_preprint":false},{"pmid":"42069755","id":"PMC_42069755","title":"Hypermethylation of ZNF154 promotes malignant potential of ovarian cancer cells by diminishing ZNF154/KAP1-mediated ROMO1 repression.","date":"2026","source":"Cell death & disease","url":"https://pubmed.ncbi.nlm.nih.gov/42069755","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.05.24.655877","title":"ROMO1 loss in cholinergic neurons induces mitochondrial ultrastructural damage and ALS-like neuromuscular degeneration","date":"2025-05-28","source":"bioRxiv","url":"https://doi.org/10.1101/2025.05.24.655877","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.11.06.622366","title":"Alternative Import-Channels And Destinations Of Mitochondrial PINK1 Controlled By Trans-Membrane-Domain Structural Plasticity","date":"2024-11-06","source":"bioRxiv","url":"https://doi.org/10.1101/2024.11.06.622366","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":25929,"output_tokens":5892,"usd":0.083084,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":14762,"output_tokens":4188,"usd":0.089255,"stage2_stop_reason":"end_turn"},"total_usd":0.172339,"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\": 2006,\n      \"finding\": \"ROMO1 (Reactive oxygen species modulator 1) is a novel protein localized in the mitochondria that increases cellular ROS levels when overexpressed.\",\n      \"method\": \"Subcellular fractionation/localization; overexpression with ROS measurement\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiment plus functional overexpression assay, single lab, foundational study\",\n      \"pmids\": [\"16842742\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In response to TNF-alpha, TNF complex II (comprising RIP1, TRADD, TRAF2, FADD, and pro-caspase-8) binds to the C-terminus of mitochondrial ROMO1. ROMO1 then recruits BCL-XL to reduce mitochondrial membrane potential, resulting in ROS production and apoptotic cell death, establishing ROMO1 as a molecular bridge between TNF-alpha signaling and mitochondrial ROS production.\",\n      \"method\": \"Co-immunoprecipitation, binding domain mapping, siRNA knockdown with apoptosis and ROS readouts\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP with defined domain mapping, single lab, multiple functional readouts\",\n      \"pmids\": [\"20203691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ROMO1 knockdown by siRNA blocks mitochondrial ROS production caused by serum deprivation (originating in the mitochondrial electron transport chain) and inhibits serum deprivation-induced apoptosis.\",\n      \"method\": \"siRNA knockdown, mitochondrial ROS measurement, apoptosis assay\",\n      \"journal\": \"Apoptosis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KD with defined cellular phenotype (ROS and apoptosis), single lab, two orthogonal readouts\",\n      \"pmids\": [\"19904609\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ROMO1-derived ROS are required for normal cell proliferation; ROMO1 knockdown reduces ROS and inhibits cell growth via the ERK pathway, which can be rescued by exogenous hydrogen peroxide.\",\n      \"method\": \"siRNA knockdown, ERK pathway inhibition, exogenous H2O2 rescue experiment\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with pathway rescue experiment, single lab, epistatic placement in ERK pathway\",\n      \"pmids\": [\"18313394\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Enforced ROMO1 expression triggers premature senescence and DNA damage via ROS production originating in the mitochondrial electron transport chain; endogenous ROMO1 expression increases with replicative age in IMR-90 fibroblasts and ROMO1 knockdown inhibits replicative senescence progression.\",\n      \"method\": \"Overexpression, siRNA knockdown, ROS measurement, senescence assays (SA-β-gal), DNA damage markers\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD and OE with multiple orthogonal phenotypic readouts, single lab\",\n      \"pmids\": [\"18836179\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Endogenous ROMO1-derived mitochondrial ROS are required for G1-to-S cell cycle transition in normal WI-38 fibroblasts; ROMO1 knockdown reduces ROS and causes G1 arrest associated with increased p27(Kip1) levels.\",\n      \"method\": \"siRNA knockdown, flow cytometry cell cycle analysis, p27(Kip1) western blot, ROS measurement\",\n      \"journal\": \"Free radical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with cell cycle and molecular marker readouts, single lab, pathway placement via p27(Kip1)\",\n      \"pmids\": [\"19513905\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Upregulated MYC induces ROMO1 expression; in a negative-feedback loop, ROMO1-derived ROS stimulate SKP2-mediated ubiquitylation and proteasomal degradation of MYC in normal lung fibroblasts. Additionally, pre-existing ROMO1-derived ROS are required for MYC induction and quiescent cell cycle re-entry.\",\n      \"method\": \"Overexpression, siRNA knockdown, ubiquitylation assay, western blot for Myc/Skp2, cell cycle analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple mechanistic assays (ubiquitylation, pathway placement), single lab\",\n      \"pmids\": [\"21558421\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"BCL-XL expression blocks serum deprivation-induced and ROMO1-triggered ROS generation and apoptotic cell death, indicating BCL-XL acts downstream of or in parallel to ROMO1 to suppress oxidative stress.\",\n      \"method\": \"BCL-XL overexpression, ROS measurement, apoptosis assay, epistasis with ROMO1\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single overexpression approach with limited mechanistic detail in abstract\",\n      \"pmids\": [\"21399876\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ROMO1 mediates mitochondrial ROS production through complex III of the mitochondrial electron transport chain and is required for apoptosis induced by oxidative stress (H2O2) in lung epithelial cells; ROMO1 knockdown suppresses cellular ROS and H2O2-induced cell death.\",\n      \"method\": \"siRNA knockdown, complex III identification, ROS measurement, cell death assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with specific complex III assignment and multiple functional readouts, single lab\",\n      \"pmids\": [\"23867822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ROMO1 is required for mitochondrial fusion and normal cristae morphology; oxidative stress promotes formation of high-molecular-weight ROMO1 complexes; ROMO1 is essential for oligomerization of the inner membrane GTPase OPA1, which maintains cristae junction integrity. ROMO1 knockdown causes mitochondrial fragmentation, loss of cristae, impaired mitochondrial respiration, and increased sensitivity to cell death stimuli.\",\n      \"method\": \"Genome-wide RNAi screen, ROMO1 KD, native PAGE for OPA1 oligomers, electron microscopy of cristae, mitochondrial respiration assay, redox stress treatment\",\n      \"journal\": \"Science signaling\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide screen identification plus multiple orthogonal validation methods (native PAGE, EM, respiration), replicated across cell lines\",\n      \"pmids\": [\"24473195\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"ROMO1 expression is required to maintain constitutive NF-κB nuclear DNA-binding activity and transcriptional activity via constitutive IκBα phosphorylation in hepatocellular carcinoma cells; ROMO1 overexpression promotes p65 nuclear translocation.\",\n      \"method\": \"siRNA knockdown, overexpression, NF-κB reporter assay, IκBα phosphorylation western blot, p65 nuclear translocation assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD and OE with pathway-level mechanistic readouts, single lab\",\n      \"pmids\": [\"25044121\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ROMO1-induced increase in invasive activity is blocked by an IKK inhibitor, demonstrating that ROMO1-driven tumor cell invasion is mediated through the NF-κB signaling pathway.\",\n      \"method\": \"siRNA knockdown, IKK inhibitor treatment, invasion assay\",\n      \"journal\": \"International journal of oncology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological epistasis with invasion phenotype, single lab\",\n      \"pmids\": [\"25673177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ROMO1 is a constituent of the human TIM23 presequence translocase complex with an exceptionally short half-life. ROMO1 is not required for general presequence import but is specifically required for import of the inner membrane protease YME1L; in ROMO1 knockout cells, YME1L is lost from the inner membrane, leading to aberrant OPA1 processing and altered inner membrane structure. ROMO1 also participates in the dynamics of TIM21 during respiratory chain biogenesis.\",\n      \"method\": \"Mass spectrometry identification of TIM23 complex constituents, ROMO1 KO cell line analysis, import assays, OPA1 processing western blot, TIM21 dynamics analysis\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mass spectrometry complex identification, KO cell line with multiple orthogonal mechanistic readouts (import assay, OPA1 processing, TIM21 dynamics), rigorous controls\",\n      \"pmids\": [\"30598479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"ROMO1 forms a nonselective cation channel with its amphipathic helical transmembrane domain necessary for pore-forming activity; structurally resembles class II viroporins; channel activity is specifically inhibited by Fe2+ ions. A hexameric structural model was constructed by experimental data-guided structural bioinformatics.\",\n      \"method\": \"Electrophysiology (channel recording), transmembrane domain mutagenesis, structural bioinformatics/modeling, Fe2+ inhibition assay\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct electrophysiological reconstitution of channel activity, domain mutagenesis, structural modeling with experimental validation\",\n      \"pmids\": [\"29545371\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SRA receptor stimulation activates ERK phosphorylation, which upregulates and activates ROMO1 to enhance mitochondrial ROS production and promote NETs formation in neutrophils; inhibition of ROMO1 dampens SRA-stimulated NET release.\",\n      \"method\": \"Pharmacological inhibition, siRNA knockdown, ERK inhibition, ROS measurement, NET assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistatic placement of ROMO1 downstream of ERK in SRA-NETs pathway, single lab, inhibitor and KD approaches\",\n      \"pmids\": [\"30850160\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ROMO1 overexpression in bone marrow cells results in M2 polarization of bone marrow-derived macrophages through the mTORC1 signaling pathway.\",\n      \"method\": \"Overexpression in bone marrow cells, glioblastoma mouse model, macrophage polarization assay, mTORC1 pathway analysis\",\n      \"journal\": \"Aging\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, in vivo model with pathway inference, limited mechanistic detail in abstract\",\n      \"pmids\": [\"31945745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ROMO1 inhibition elevates BAX protein levels by downregulating the ubiquitin-proteasome system and downregulates the interaction between BAX and Parkin, thereby sensitizing colorectal cancer cells to TRAIL-mediated mitochondrial apoptosis.\",\n      \"method\": \"siRNA knockdown, western blot for BAX and ubiquitin-proteasome components, Co-IP for BAX-Parkin interaction, TRAIL apoptosis assay, xenograft model\",\n      \"journal\": \"Cancers\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with Co-IP interaction mapping and in vivo validation, single lab\",\n      \"pmids\": [\"32825500\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ROMO1 knockdown in porcine preimplantation embryos disrupts OPA1 isoform balance, leading to cytochrome c release, reduced ATP, mitochondrial fragmentation, decreased mitochondrial membrane potential, increased ROS production, and induction of apoptosis; ROMO1 overexpression rescues these defects.\",\n      \"method\": \"siRNA knockdown, overexpression rescue, OPA1 western blot, cytochrome c release assay, ATP measurement, mitochondrial morphology imaging\",\n      \"journal\": \"Cell division\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD and OE rescue with multiple molecular readouts, consistent with mammalian findings, single lab\",\n      \"pmids\": [\"34915903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRAF2 deficiency increases ROMO1 expression, which activates the NAD+/SIRT3/SOD2 pathway to promote ROS production, cause mitochondrial dysfunction, and trigger DNA damage response leading to hepatocellular carcinoma senescence.\",\n      \"method\": \"TRAF2 knockdown/KO, ROMO1 western blot, NAD+/SIRT3/SOD2 pathway analysis, mitochondrial function assays, DNA damage markers\",\n      \"journal\": \"Free radical biology & medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with molecular pathway placement, single lab, multiple readouts\",\n      \"pmids\": [\"38043870\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PKLR undergoes nuclear translocation under androgen-deprivation conditions and binds to the MYCN/MAX complex to upregulate ROMO1 expression; elevated ROMO1 alters mitochondrial function and promotes neuroendocrine differentiation of prostate cancer cells.\",\n      \"method\": \"Nuclear fractionation, Co-IP for PKLR-MYCN/MAX complex, ROMO1 western blot, mitochondrial function assays, NE differentiation markers\",\n      \"journal\": \"Redox biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with nuclear fractionation and functional pathway readouts, single lab\",\n      \"pmids\": [\"36963289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ROMO1 overexpression causes a reductive shift in the mitochondrial cysteinome, protecting mitochondrial proteinaceous thiols from oxidation; this promotes energy metabolism and Ca2+ uniport while inhibiting mitochondrial permeability transition. ROMO1 overexpression reverses cysteinome oxidations in aged mice and slows functional decline.\",\n      \"method\": \"Redox proteomics of mitochondrial cysteinome, ROMO1 overexpression in cells and aged mice, mitochondrial respiration assay, Ca2+ uniport measurement, mPTP assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — redox proteomics with multiple orthogonal mechanistic readouts (energy metabolism, Ca2+ uniport, mPTP), in vivo validation in aged mice\",\n      \"pmids\": [\"40461459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ROMO1 is essential for embryonic development (Romo1-null mice die before embryonic day 8.5); conditional ROMO1 knockout in pancreatic beta cells impairs glucose-stimulated insulin secretion and reduces spare respiratory capacity by specifically decreasing complex II/succinate dehydrogenase activity; human islets lacking ROMO1 also show reduced spare respiratory capacity.\",\n      \"method\": \"Whole-body and conditional (beta cell) Romo1 knockout mice, glucose tolerance test, insulin secretion assay, mitochondrial respiratory analysis (Seahorse), isolated human islets with ROMO1 KO\",\n      \"journal\": \"Diabetologia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vivo conditional KO with translational validation in human islets, multiple orthogonal metabolic readouts\",\n      \"pmids\": [\"41995846\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ROMO1 silencing in airway epithelial cells suppresses cigarette smoke extract-induced mitochondrial ROS production, STAT6 phosphorylation, and MUC5AC (mucin) expression, placing ROMO1 upstream of a mitochondrial ROS-STAT6 pathway that drives airway mucus hypersecretion.\",\n      \"method\": \"siRNA knockdown, mitochondrial ROS measurement, STAT6 phosphorylation western blot, MUC5AC expression assay, mitochondrial targeted antioxidant and STAT6 inhibitor epistasis\",\n      \"journal\": \"Respiratory research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KD with pharmacological epistasis placing ROMO1 in defined pathway, single lab\",\n      \"pmids\": [\"41673839\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Selective depletion of ROMO1 in cholinergic neurons in mice causes adult-onset progressive locomotor deficits resembling ALS, with age-dependent motor neuron loss, axon degeneration, disrupted cholinergic transmission, neuromuscular junction denervation, and muscle atrophy; early mitochondrial cristae deformation precedes onset of ALS-like symptoms.\",\n      \"method\": \"Conditional KO in cholinergic neurons, behavioral locomotor assays, motor neuron counting, axon morphology, neuromuscular junction staining, electron microscopy of cristae\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with multiple orthogonal readouts and temporal dissection, preprint not yet peer-reviewed\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Structural modelling predicts ROMO1 forms a channel within the TIM23 core complex together with TIM17, providing an alternative import channel for PINK1 translocation into the matrix; ROMO1/TIM17 and PARL/TIM17 interactions are mutually exclusive, with PINK1 TMD structural plasticity (α-helix vs α/β-hybrid) determining whether it is translocated through the ROMO1/TIM17 channel or cleaved by PARL.\",\n      \"method\": \"Structural modelling, PINK1 import analysis in intact cells, transmembrane domain structural prediction\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — primarily computational structural modelling with limited direct biochemical validation; preprint\",\n      \"pmids\": [],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"ROMO1 is the most significantly downregulated mitochondrial protein at 24 hours post-high-dose irradiation in keratinocytes; ROMO1 overexpression increases mtROS and mitochondrial membrane potential but suppresses cell viability after radiation; skin-specific Romo1 knockout mice show accelerated wound healing and enhanced tissue regeneration after radiation injury.\",\n      \"method\": \"Mitochondrial proteomics, ROMO1 overexpression, Romo1 skin-specific KO mice, ROS and membrane potential measurement, wound healing and skin injury scoring\",\n      \"journal\": \"Journal of Sichuan University. Medical science edition\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomics identification plus OE and KO in vivo with multiple functional readouts, single lab\",\n      \"pmids\": [\"42021879\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ROMO1 is a nuclear-encoded inner mitochondrial membrane protein that functions as a nonselective cation channel (structurally resembling class II viroporins, inhibited by Fe2+), acts as a redox sensor forming high-molecular-weight complexes under oxidative stress, and serves as an essential regulator of mitochondrial dynamics by supporting OPA1 oligomerization for cristae junction integrity and mitochondrial fusion; it is also a constituent of the human TIM23 presequence translocase specifically required for YME1L protease import, mediates ROS production through mitochondrial electron transport chain complex III (in part by protecting the mitochondrial cysteinome), and acts as a molecular bridge linking extramitochondrial signals (TNF-alpha via TNF complex II, Myc, PKLR/MYCN, DKK1, TRAF2) to mitochondrial ROS output that governs cell proliferation, apoptosis, senescence, NF-κB activation, and, in vivo, embryonic development, pancreatic beta-cell spare respiratory capacity at complex II/SDH, and motor neuron integrity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ROMO1 is a nuclear-encoded inner mitochondrial membrane protein that couples mitochondrial reactive oxygen species (ROS) output to cell proliferation, apoptosis, senescence, and mitochondrial architecture [#0, #4, #9]. It forms a nonselective cation channel through an amphipathic helical transmembrane domain, structurally resembling class II viroporins and inhibited by Fe2+ ions [#13]. ROMO1 generates ROS through electron transport chain complex III and is required for ROS-dependent cellular outcomes including normal proliferation via the ERK pathway, G1-to-S transition, replicative senescence, and oxidative-stress-induced apoptosis [#8, #3, #5, #4]. As an essential regulator of mitochondrial dynamics, ROMO1 supports OPA1 oligomerization to maintain cristae junction integrity and mitochondrial fusion, with its loss causing mitochondrial fragmentation, cristae collapse, and impaired respiration [#9]. ROMO1 is a constituent of the human TIM23 presequence translocase specifically required for import of the inner-membrane protease YME1L, whose loss in ROMO1-null cells causes aberrant OPA1 processing [#12]. Beyond intrinsic mitochondrial functions, ROMO1 serves as a molecular bridge transmitting extramitochondrial signals to mitochondrial ROS: TNF-alpha via TNF complex II [#1], MYC in a ROS-dependent negative-feedback loop [#6], and TRAF2 deficiency or PKLR/MYCN inputs that drive senescence and neuroendocrine differentiation [#18, #19], with downstream effects on NF-\\u03baB activation and tumor cell invasion [#10, #11]. In vivo, ROMO1 is essential for embryonic development, supports pancreatic beta-cell spare respiratory capacity through complex II/succinate dehydrogenase, protects the mitochondrial cysteinome to sustain energy metabolism and limit the permeability transition, and maintains motor neuron integrity [#21, #20].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Establishing that an uncharacterized mitochondrial protein could actively raise cellular ROS defined ROMO1 as a candidate ROS modulator rather than a passive bystander.\",\n      \"evidence\": \"Subcellular fractionation plus overexpression with ROS measurement\",\n      \"pmids\": [\"16842742\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular mechanism for ROS generation identified\", \"Source within mitochondria not localized\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Linking ROMO1-derived ROS to proliferation and senescence showed the protein's ROS output is a physiological signal, not merely a damaging byproduct.\",\n      \"evidence\": \"siRNA knockdown and overexpression with ERK-pathway and senescence/DNA-damage readouts, H2O2 rescue\",\n      \"pmids\": [\"18313394\", \"18836179\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism connecting ROMO1 to ERK not resolved\", \"ROS-generating machinery not yet pinpointed\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Demonstrating ROMO1-ROS requirement for G1-to-S transition placed the protein within cell-cycle control via p27(Kip1).\",\n      \"evidence\": \"siRNA knockdown, flow cytometry, p27 western blot, ROS measurement in fibroblasts\",\n      \"pmids\": [\"19513905\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct molecular link from ROS to p27 regulation not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identifying TNF complex II binding to the ROMO1 C-terminus established ROMO1 as a bridge translating extramitochondrial death signals into mitochondrial ROS and apoptosis.\",\n      \"evidence\": \"Co-IP, domain mapping, siRNA knockdown with ROS and apoptosis readouts; serum-deprivation ROS/apoptosis assays\",\n      \"pmids\": [\"20203691\", \"19904609\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"BCL-XL recruitment mechanism partially defined\", \"Channel basis of ROS production unknown at this stage\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Placing ROMO1 in a MYC negative-feedback loop and downstream of BCL-XL refined how proliferative and survival signals are tuned by its ROS output.\",\n      \"evidence\": \"Overexpression, knockdown, ubiquitylation assays, epistasis with BCL-XL\",\n      \"pmids\": [\"21558421\", \"21399876\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"BCL-XL finding is single-approach overexpression\", \"Directness of ROS effect on SKP2/MYC ubiquitylation not biochemically isolated\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Assigning ROMO1-dependent ROS to complex III gave a specific source within the electron transport chain for its oxidative output.\",\n      \"evidence\": \"siRNA knockdown with complex III identification, ROS and cell death assays in lung epithelial cells\",\n      \"pmids\": [\"23867822\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ROMO1 acts on complex III directly or indirectly not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identifying ROMO1 as essential for OPA1 oligomerization and cristae integrity reframed it as a core regulator of mitochondrial dynamics, and linking it to NF-\\u03baB extended its signaling reach.\",\n      \"evidence\": \"Genome-wide RNAi screen, native PAGE for OPA1 oligomers, EM of cristae, respiration assays; NF-\\u03baB reporter and I\\u03baB\\u03b1 phosphorylation assays\",\n      \"pmids\": [\"24473195\", \"25044121\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which ROMO1 promotes OPA1 oligomerization not defined\", \"Link between ROMO1 ROS and constitutive I\\u03baB\\u03b1 phosphorylation indirect\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Reconstituting channel activity and defining ROMO1 as a TIM23 translocase constituent required for YME1L import provided two distinct biochemical activities and connected ROMO1 to OPA1 processing.\",\n      \"evidence\": \"Electrophysiology, TMD mutagenesis, structural modeling, Fe2+ inhibition; mass spectrometry of TIM23 complex, KO cells, import and OPA1-processing assays\",\n      \"pmids\": [\"29545371\", \"30598479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relationship between channel activity and translocase function unresolved\", \"How ROMO1 selects YME1L over other substrates not defined\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Extending ROMO1 to immune and cancer contexts (macrophage polarization, BAX/Parkin-dependent TRAIL sensitization, NET formation) showed its ROS output shapes diverse cell-fate programs.\",\n      \"evidence\": \"Overexpression and knockdown with mTORC1, BAX-Parkin Co-IP, NET and apoptosis assays; xenograft/in vivo models\",\n      \"pmids\": [\"31945745\", \"32825500\", \"30850160\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"mTORC1 polarization finding is low-confidence with limited mechanism\", \"Directness of ROMO1 effects on each effector not isolated\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defining TRAF2- and PKLR/MYCN-driven ROMO1 induction connected upstream transcriptional inputs to ROMO1-dependent senescence and neuroendocrine differentiation.\",\n      \"evidence\": \"TRAF2 KO with NAD+/SIRT3/SOD2 pathway analysis; nuclear fractionation and Co-IP for PKLR-MYCN/MAX with NE differentiation markers\",\n      \"pmids\": [\"38043870\", \"36963289\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether ROMO1 induction is the sole driver of these phenotypes not established\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Showing ROMO1 protects the mitochondrial cysteinome reframed it as a guardian of proteinaceous thiols supporting energy metabolism, Ca2+ uniport, and resistance to permeability transition, with anti-aging effects in vivo.\",\n      \"evidence\": \"Redox proteomics, overexpression in cells and aged mice, respiration, Ca2+ uniport and mPTP assays\",\n      \"pmids\": [\"40461459\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which ROMO1 channel/redox activity drives cysteinome reduction not defined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"In vivo knockout studies established ROMO1 as essential for embryogenesis, beta-cell respiratory capacity at complex II/SDH, and tissue contexts including airway mucus and radiation injury, demonstrating organismal-level requirement.\",\n      \"evidence\": \"Whole-body and conditional KO mice, human islet KO, Seahorse respirometry, glucose-stimulated insulin secretion; airway epithelial knockdown with STAT6/MUC5AC readouts; skin-specific KO with wound-healing scoring\",\n      \"pmids\": [\"41995846\", \"41673839\", \"42021879\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How ROMO1 loss specifically reduces complex II/SDH activity not mechanistically resolved\", \"Tissue-specific divergent outcomes not unified mechanistically\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ROMO1's channel activity, redox-sensing/cysteinome protection, and TIM23 translocase roles are mechanistically integrated into a single molecular function remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structure of ROMO1 within the assembled TIM23 complex\", \"Causal hierarchy among channel, ROS-generation, and OPA1/cristae roles not established\", \"Substrate-selection rules for the translocase function undefined\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005215\", \"supporting_discovery_ids\": [13]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [9, 20]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0, 9, 12]},\n      {\"term_id\": \"GO:0005743\", \"supporting_discovery_ids\": [12, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"R-HSA-5357801\", \"supporting_discovery_ids\": [1, 2, 8, 16]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [9, 12]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [4, 20]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"complexes\": [\"TIM23 presequence translocase\"],\n    \"partners\": [\"OPA1\", \"YME1L\", \"TRAF2\", \"BCL-XL\", \"TIM17\", \"MYC\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}