{"gene":"ROM1","run_date":"2026-06-10T06:43:37","timeline":{"discoveries":[{"year":1992,"finding":"ROM-1 is a 37 kDa integral membrane protein localized to the photoreceptor disk rim, structurally similar to peripherin/RDS (35% identical), similarly oriented in the membrane with a conserved cysteine- and proline-rich domain in the disk lumen. ROM-1 forms disulfide-linked homodimers but does not form heterodimers with peripherin via disulfide bonds; instead the two proteins associate noncovalently.","method":"Protein characterization, subcellular localization, biochemical fractionation, SDS-PAGE under reducing/non-reducing conditions","journal":"Neuron","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal biochemical methods in the original cloning paper, replicated across many subsequent studies","pmids":["1610568"],"is_preprint":false},{"year":1996,"finding":"The peripherin/RDS–ROM-1 complex from bovine rod outer segment membranes is a tetramer with a protein mass of ~135 kDa, as determined by hydrodynamic analysis (Stokes radius 6.2 nm, sedimentation coefficient 5.8 S). The complex is present at high surface density (~4100/µm²) at disk rims and comprises ~4% of total bovine ROS membrane protein.","method":"Gel exclusion chromatography, velocity sedimentation through H₂O- and D₂O-based sucrose gradients, competitive ELISA, immunoaffinity purification","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — rigorous hydrodynamic reconstitution with multiple orthogonal methods; replicated by subsequent studies","pmids":["8634257"],"is_preprint":false},{"year":1995,"finding":"When peripherin/RDS and ROM-1 cDNAs are co-expressed in COS-1 cells, they assemble into a stable tetrameric complex (4.9 S) with stoichiometry similar to native ROS membranes. Individually, peripherin/RDS (5.1 S) and ROM-1 (4.3 S) each form homotetramers. Recombinant peripherin/RDS is glycosylated while ROM-1 is not, mirroring the native proteins.","method":"Velocity sedimentation, Western blot, immunofluorescence microscopy, co-transfection in COS-1 cells","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods, replicated across labs","pmids":["7578020"],"is_preprint":false},{"year":1996,"finding":"The peripherin/RDS L185P mutant associated with digenic retinitis pigmentosa fails to form native homotetramers on its own, but can assemble with wild-type ROM-1 to form a structurally normal heterotetrameric complex. This conditional assembly defect provides the molecular basis for digenic RP requiring co-inheritance of mutations in both genes.","method":"Sedimentation velocity analysis of heterologously expressed proteins in COS-1 cells","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — sedimentation velocity in heterologous expression system, single lab but clear mechanistic finding replicated in follow-up studies","pmids":["8943002"],"is_preprint":false},{"year":2000,"finding":"Under reducing conditions, peripherin/RDS and ROM-1 exist as homomeric and heteromeric noncovalent core complexes (tetramers). Under non-reducing conditions, core complexes associate via intermolecular disulfide bonds (through Cys-150 of peripherin/RDS) to form higher-order oligomers. ROM-1 shows little tendency to form disulfide-linked oligomers on its own; larger oligomers consist only of disulfide-linked peripherin/RDS dimers. Disc membranes contain twice as much peripherin/RDS as ROM-1.","method":"Velocity sedimentation, SDS-gel electrophoresis under reducing/non-reducing conditions, immunoaffinity chromatography, chemical cross-linking, COS-1 cell expression","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods, rigorous controls with reducing/non-reducing conditions and mutagenesis implications","pmids":["10681511"],"is_preprint":false},{"year":2001,"finding":"Leu-185 of peripherin-2 (and corresponding Leu-188 of ROM-1) is critical for tetramer formation but not for dimer formation. The L185P and L185A peripherin-2 mutants and L188P ROM-1 mutant form noncovalent dimers but fail to assemble into core tetramers. The G113E ROM-1 mutation is expressed 20-fold lower than wild-type, behaving mechanistically as a null allele. Peripherin-2-containing tetramers are required for higher-order disulfide-linked oligomer formation.","method":"Velocity sedimentation, co-immunoprecipitation, chemical cross-linking of heterologously expressed proteins","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution with mutagenesis, multiple orthogonal methods, single lab","pmids":["11297544"],"is_preprint":false},{"year":1996,"finding":"ROM-1 membrane topology shows the C-terminus localized to the cytoplasmic side of the disc membrane and a large segment localized to the lumen side. ROM-1 is localized to the rim region of both rod and cone outer segment disc membranes by immunogold electron microscopy. In heterologously expressed mammalian cells, ROM-1 is retained in internal cellular membranes and not translocated to the plasma membrane. All ROM-1 and peripherin/RDS from rod outer segments form a tightly associated complex by immunoprecipitation.","method":"Proteolytic digestion studies, immunolabeling, pre- and post-embedding immunogold electron microscopy, immunofluorescence, immunoprecipitation","journal":"Investigative ophthalmology & visual science","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including EM-level localization and biochemical co-IP, replicated across studies","pmids":["8603840"],"is_preprint":false},{"year":2002,"finding":"A fraction of ROM-1 (13–23%) associates with Triton X-100-resistant membrane rafts (enriched in cholesterol and sphingomyelin) from rod outer segment disk membranes. Peripherin/RDS is entirely absent from these raft domains. Cholesterol depletion with methyl-β-cyclodextran reduces ROM-1 (specifically the dimeric form) in the raft fraction and collapses the caveolin complex. This pool of ROM-1 may play a regulatory role in peripherin/RDS-dependent membrane fusion.","method":"Detergent-resistant membrane isolation, sucrose density gradients, biochemical lipid analysis, cholesterol depletion","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — clean fractionation with lipid analysis, single lab, functional interpretation is proposed but not directly tested","pmids":["12196538"],"is_preprint":false},{"year":2006,"finding":"ROM-1 potentiates peripherin/RDS-dependent membrane fusion. Co-expression of ROM-1 and peripherin/RDS yields the highest membrane fusogenicity in a cell-free fusion assay. Proteoliposomes containing ROM-1 alone are not fusogenic, while those containing the ROM-1/peripherin/RDS complex show optimal fusion. Peptide competition studies suggest that ROM-1 optimizes fusion by facilitating formation of a fusion-competent peripherin/RDS C-terminus.","method":"COS cell heterologous expression, cell-free fusion assay with fluorescently labeled outer segment plasma membranes and proteoliposomes, peptide competition","journal":"Experimental eye research","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — in vitro fusion assay with specific controls, single lab, functional consequence demonstrated","pmids":["17055485"],"is_preprint":false},{"year":1999,"finding":"A chimeric protein (rom/D2) containing the intradiscal D2 loop of peripherin/RDS in the context of ROM-1 interacted more stably with peripherin/RDS than wild-type ROM-1. This chimera fully rescued the ultrastructural phenotype in rds+/- mice but had no effect in rds-/- mice. These data indicate that peripherin/RDS interacts noncovalently with itself and ROM-1 via the D2 loop and that peripherin/RDS is present at 2.5-fold higher levels than ROM-1 in vivo.","method":"Transgenic mouse expression, detergent/urea titration for stability, immunoprecipitation, electron microscopy","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — transgenic rescue experiments combined with biochemical interaction analysis, in vivo validation","pmids":["10506174"],"is_preprint":false},{"year":2006,"finding":"ROM-1 transport to the outer segment occurs independently of rhodopsin. In rhodopsin-knockout mice, ROM-1 localizes to ciliary membranes at the distal cilium tip where outer segment-like protrusions form. In rds (peripherin/RDS-null) mice, ROM-1 accumulates in distal ciliary membranes, indicating ROM-1 possesses its own sorting and transport signals independent of peripherin/RDS.","method":"Immunohistochemistry, electron microscopy, analysis of rhodopsin-knockout and peripherin/RDS-knockout mouse models","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean knockout models with direct localization experiments, multiple genotypes tested","pmids":["16639027"],"is_preprint":false},{"year":2018,"finding":"The intermolecular disulfide bond at Prph2-C150/Rom1-C153 is required for higher-order covalent Prph2/Rom1 complex formation and for normal OS structure and function. C150S-Prph2 traffics to the OS and interacts with Rom1 to form non-covalent tetramers, but cannot support normal OS structure alone. Cones are especially sensitive to lack of large Prph2 complexes compared to rods. C150S-Prph2 supports haploinsufficiency in rods but a dominant-negative phenotype in cones.","method":"Knockin mouse model, electroretinography, immunofluorescence, biochemical analysis of oligomerization","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — knockin mouse with specific cysteine mutation, multiple readouts including structure, function, and biochemistry","pmids":["29961824"],"is_preprint":false},{"year":2019,"finding":"The Prph2 C-terminus is necessary and sufficient for initiation of photoreceptor outer segments, while OS maturation requires the body of Prph2 and associated large oligomers. ROM-1 is a key determinant of whether Prph2 complexes utilize conventional versus unconventional (Golgi bypass) secretory pathways to reach the OS. Ablating ROM-1 in Prph2Y/+ mice (Y141C knockin) eliminates abnormal Prph2/ROM1 complexes and converts the macular dystrophy/pattern dystrophy phenotype to a rod-dominant retinitis pigmentosa phenotype.","method":"Chimeric knockin mouse, ROM-1 knockout crosses, electroretinography, immunofluorescence, biochemical complex analysis, secretory pathway analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models with in vivo functional and biochemical readouts, two orthogonal experimental approaches","pmids":["30307502"],"is_preprint":false},{"year":2017,"finding":"ROM-1 modifies the phenotype of the Y141C-Prph2 mutation: co-expression of ROM-1 rescues Y141C-Prph2 retention in the endoplasmic reticulum. In heterozygous Y141C knockin mice, Y141C-Prph2 and ROM-1 form abnormal complexes. Ablation of ROM-1 in Y141C Prph2 heterozygous mice eliminates abnormal complexes, reduces total Prph2 to haploinsufficient levels, and shifts the phenotype from cone-rod (pattern dystrophy) to rod-dominant (retinitis pigmentosa).","method":"Co-expression in vitro, knockin/knockout mouse crosses, electroretinography, biochemical complex analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vitro and in vivo approaches, multiple orthogonal methods, mechanistic pathway placement","pmids":["28053051"],"is_preprint":false},{"year":2017,"finding":"Peripherin-2 mutants P210L and C214S are misfolded and show decreased binding to wild-type peripherin-2 and ROM-1. Both mutants preferentially form non-covalent mutant-mutant and wild-type-mutant dimers, and also ROM-1–mutant dimers. Only wild-type/mutant peripherin-2 dimers, not ROM-1/mutant dimers, can be targeted to murine rod outer segments. This reveals opposing roles: peripherin-2 promotes, while ROM-1 opposes, OS targeting of these adRP-linked peripherin-2 mutants.","method":"Co-immunoprecipitation, protein assembly analysis, rod OS targeting assays in murine photoreceptors","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — co-IP plus in vivo OS targeting, single lab, multiple mutants tested","pmids":["28539581"],"is_preprint":false},{"year":2022,"finding":"Cryo-EM structures of PRPH2-ROM1 reveal that they form heterodimers and higher-order oligomers. High-risk mutations causing blindness map to the protein-dimer interface. Cysteine bridges connect dimers into positively curved oligomers; negatively curved oligomers were also observed. Hexamers and octamers exhibit a secondary micelle enveloping four carboxyl-terminal helices, supporting a role in membrane remodeling.","method":"Single-particle cryo-electron microscopy","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 1 / Moderate — cryo-EM structural determination with functional mapping of disease mutations, single study","pmids":["36351012"],"is_preprint":false},{"year":2023,"finding":"ROM1 knockout mice show compensatory increased disc content of PRPH2 but display delayed disc enclosure with large-diameter discs lacking incisures. Increasing PRPH2 levels rescues these morphological defects. A knockin mouse in which the tetraspanin body of PRPH2 is replaced with that of ROM1 still forms disc rims, demonstrating that ROM1 is redundant to PRPH2 as a molecular building block of disc rims when PRPH2 is in excess.","method":"ROM1 knockout mouse, PRPH2-overexpression rescue, PRPH2/ROM1 chimeric knockin mouse, electron microscopy, disc morphology analysis","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple genetic models with quantitative morphological readouts, in vivo rescue experiments","pmids":["37991486"],"is_preprint":false},{"year":2020,"finding":"Reducing ROM-1 levels (Rom1+/-) has no effect on retinal structure or function in the absence of Prph2 mutations, but modifies the phenotype of specific Prph2 mutations in a mutation-specific manner: reducing ROM-1 in Prph2K153Del mice improved rod and cone function and ameliorated K153Del-associated oligomerization defects; reducing ROM-1 in Prph2R172W mice worsened rod and cone function; ROM-1 reduction had no effect in Prph2C213Y mice.","method":"Knockin and knockout mouse crosses, electroretinography, biochemical PRPH2/ROM1 oligomerization analysis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — three independent knockin models crossed with ROM-1 heterozygous knockout, multiple functional and biochemical readouts","pmids":["32716032"],"is_preprint":false},{"year":2015,"finding":"RDS/PRPH2 glycosylation regulates RDS·ROM-1 complex formation, particularly in cones. In N229S knockin mice (unglycosylated RDS), cone electroretinogram responses were decreased by 40%. In the nrl-/- background, both RDS and ROM-1 protein levels were decreased by ~60%, suggesting glycosylation of RDS is required for RDS stability/function in cones and affects the RDS·ROM-1 complex.","method":"Knockin mouse model, electroretinography, Western blot analysis, nrl-/- background crosses","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockin mouse with functional and biochemical readouts, cone-specific effect demonstrated","pmids":["26420485"],"is_preprint":false},{"year":2010,"finding":"A dominant missense mutation in Rom1 (Trp182Arg, Rom1Rgsc1156) causes progressive retinal degeneration. The W182R substitution leads to decreased protein levels of both ROM-1 and peripherin/RDS, reduction in peripherin/RDS-containing tetramers at disc rims, and unstable disorganized outer segments. ROM-1 and peripherin/RDS immunoreactivity were both decreased in mutant retinas.","method":"N-ethyl-N-nitrosourea mutagenesis screen, positional cloning, immunohistochemistry, Western blot, electron microscopy, electroretinography","journal":"Molecular vision","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo mouse model with multiple orthogonal readouts, single lab","pmids":["20300562"],"is_preprint":false},{"year":2025,"finding":"ROM-1 incorporates directly into the rims of discs undergoing enclosure rather than accumulating in the lamellae of nascent discs prior to their enclosure. Immunostaining shows minimal overlap between ROM-1 and prominin-1 (a nascent disc marker); ROM-1 is detected more distally where discs undergo enclosure, mirroring peripherin-2 localization.","method":"Co-immunostaining of endogenous and myc-tagged proteins with prominin-1, adeno-associated virus transduction of myc-tagged peripherin-2, electron microscopy confirmation of ultrastructure","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct co-localization with disc stage marker, electron microscopy validation, single study","pmids":["40801673"],"is_preprint":false},{"year":2025,"finding":"ROM-1's tetraspanin domain is sufficient to restore CNG channel β1 subunit localization to the rod outer segment in peripherin-2 (Rds) knockout rods, acting redundantly with peripherin-2's tetraspanin domain in this function. ROM-1 chimeras containing the tetraspanin region could restore CNGβ1 outer segment localization, indicating a structural role for disc tetraspanins in CNG channel delivery.","method":"Overexpression of MYC-tagged CNGβ1 in Rds knockout rods, expression of peripherin-2 and ROM-1 chimeras, immunostaining","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — chimera experiments in vivo, single preprint study, novel functional finding","pmids":["41256556"],"is_preprint":true},{"year":2019,"finding":"A homozygous frameshift mutation in ROM1 (c.712delC, p.Leu238Cysfs*78) causing early protein termination is sufficient to cause late-onset pattern macular dystrophy in the absence of any other plausible candidate gene mutations, establishing that complete loss of ROM1 function alone can cause macular dystrophy.","method":"Whole-exome sequencing, clinical characterization including electroretinogram, fundus autofluorescence, OCT","journal":"Cold Spring Harbor molecular case studies","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single patient case report, genetic finding without direct molecular mechanism experiment","pmids":["30630813"],"is_preprint":false},{"year":1993,"finding":"The human ROM1 gene is located on chromosome 11q13 and the murine Rom1 gene on mouse chromosome 19. The ROM1 coding region is contained within ~1.8 kb of genomic DNA with only two introns, with perfect conservation of intron splice sites with the RDS gene. The predicted pI difference between ROM-1 and peripherin in the conserved central hydrophilic domain (5.2 vs 8.2) may mediate their noncovalent association.","method":"Gene cloning, genomic sequencing, comparative sequence analysis, somatic cell hybrid mapping","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — gene structure determination with functional inference regarding protein-protein interaction; replicated by chromosomal mapping","pmids":["8504299"],"is_preprint":false}],"current_model":"ROM1 is a photoreceptor-specific tetraspanin integral membrane protein that localizes to the rim regions of rod (and cone) outer segment disc membranes, where it forms noncovalent heterotetramers with the homologous protein peripherin-2 (PRPH2); these core tetramers further associate through peripherin-2-specific intermolecular disulfide bonds (at Cys-150) to form higher-order oligomers essential for disc enclosure and outer segment morphogenesis, with ROM1 also functioning as a regulator of PRPH2 complex type, secretory trafficking pathway, and CNG channel delivery to the outer segment, and acting as a phenotypic modifier of PRPH2-associated retinal disease in a mutation-specific manner."},"narrative":{"mechanistic_narrative":"ROM1 (ROM-1) is a photoreceptor disc-rim tetraspanin integral membrane protein that, together with the homologous protein peripherin-2/RDS (PRPH2), governs the structural organization of rod and cone outer segment disc membranes [PMID:1610568, PMID:8603840]. ROM-1 and peripherin-2 assemble into noncovalent core tetramers — both as homotetramers and as mixed heterotetramers — with a stoichiometry matching native rod outer segment membranes, and Leu-188 of ROM-1 (corresponding to Leu-185 of peripherin-2) is essential for the dimer-to-tetramer transition [PMID:8634257, PMID:7578020, PMID:11297544]. These core tetramers further associate into higher-order oligomers, but covalent oligomerization depends on peripherin-2 intermolecular disulfide bonds at Cys-150 (paired with ROM-1 Cys-153); ROM-1 itself shows little tendency to form disulfide-linked oligomers, and disc membranes contain roughly twice as much peripherin-2 as ROM-1 [PMID:10681511, PMID:29961824]. Cryo-EM of PRPH2–ROM1 confirms heterodimers and curved disulfide-linked oligomers whose carboxyl-terminal helices are enveloped by a secondary micelle, consistent with a membrane-remodeling role, and disease mutations map to the dimer interface [PMID:36351012]. Functionally, ROM-1 potentiates peripherin-2-dependent membrane fusion and incorporates directly into the rims of discs undergoing enclosure, where loss of ROM-1 delays disc enclosure and produces large incisure-less discs that are rescued by excess PRPH2 — establishing ROM-1 as a building block redundant to PRPH2 in disc-rim formation [PMID:17055485, PMID:37991486, PMID:40801673]. ROM-1 carries its own outer-segment sorting signals independent of peripherin-2 and rhodopsin [PMID:16639027], regulates which secretory pathway PRPH2 complexes use to reach the outer segment, and contributes a tetraspanin-domain-dependent role in delivering the CNG channel β1 subunit to the outer segment [PMID:30307502, PMID:41256556]. ROM-1 acts as a mutation-specific modifier of PRPH2-associated retinal disease, shifting cone-rod/macular phenotypes toward rod-dominant retinitis pigmentosa when ablated, and can improve or worsen function depending on the PRPH2 allele [PMID:30307502, PMID:28053051, PMID:32716032]; a dominant Rom1 W182R mutation causes progressive retinal degeneration with destabilized peripherin-2 tetramers and disorganized outer segments [PMID:20300562].","teleology":[{"year":1992,"claim":"Established that ROM-1 is a distinct disc-rim integral membrane protein homologous to peripherin/RDS but assembling with it noncovalently rather than via disulfide bonds, defining the molecular unit of the disc rim.","evidence":"Protein characterization, subcellular fractionation, and SDS-PAGE under reducing/non-reducing conditions","pmids":["1610568"],"confidence":"High","gaps":["Did not resolve the oligomeric state of the native complex","No structural model of the interaction interface"]},{"year":1993,"claim":"Mapped the human ROM1 gene to 11q13 and showed conserved gene structure with RDS, supporting the inference that a charge difference in the conserved central domain mediates noncovalent peripherin-2 association.","evidence":"Gene cloning, genomic sequencing, and somatic cell hybrid mapping","pmids":["8504299"],"confidence":"Medium","gaps":["The proposed pI-driven association mechanism was inferential, not directly tested","No functional assay of the central domain"]},{"year":1995,"claim":"Showed that co-expressed peripherin-2 and ROM-1 self-assemble into a stable tetramer matching native stoichiometry, demonstrating the complex is intrinsic to the two proteins.","evidence":"Velocity sedimentation and co-transfection in COS-1 cells","pmids":["7578020"],"confidence":"High","gaps":["Did not establish higher-order oligomer architecture","Functional consequence of tetramer formation untested"]},{"year":1996,"claim":"Defined the native complex as a ~135 kDa tetramer at high disc-rim surface density and established membrane topology with the C-terminus cytoplasmic, placing the complex spatially and quantitatively in the outer segment.","evidence":"Hydrodynamic analysis, immunogold electron microscopy, and proteolytic topology mapping","pmids":["8634257","8603840"],"confidence":"High","gaps":["Did not address higher-order oligomerization beyond the tetramer","Mechanism linking complex to disc-rim curvature unresolved"]},{"year":1996,"claim":"Provided the molecular basis of digenic retinitis pigmentosa by showing the assembly-defective peripherin-2 L185P mutant cannot homotetramerize but is rescued into a normal heterotetramer by wild-type ROM-1.","evidence":"Sedimentation velocity analysis of mutants in COS-1 cells","pmids":["8943002"],"confidence":"High","gaps":["Did not test the assembly defect in vivo","Did not identify which residues drive heterotetramer rescue"]},{"year":2000,"claim":"Distinguished noncovalent core tetramers from covalently linked higher-order oligomers, identifying peripherin-2 Cys-150 disulfide bonds as the driver of large oligomers that ROM-1 cannot form alone.","evidence":"Velocity sedimentation, non-reducing SDS-PAGE, cross-linking, and immunoaffinity chromatography","pmids":["10681511"],"confidence":"High","gaps":["In vivo requirement of the disulfide for disc structure not yet demonstrated","Functional role of ROM-1's limited oligomerization unclear"]},{"year":2001,"claim":"Pinpointed Leu-185/Leu-188 as the residue required for the dimer-to-tetramer transition and showed peripherin-2 tetramers are obligatory for higher-order oligomers, ordering the assembly hierarchy.","evidence":"Velocity sedimentation, co-IP, and cross-linking of mutants in heterologous cells","pmids":["11297544"],"confidence":"High","gaps":["Assembly hierarchy not validated in photoreceptors at the time","Did not address how oligomers shape disc rims"]},{"year":1999,"claim":"Identified the intradiscal D2 loop as the peripherin-2 noncovalent interaction surface and confirmed in vivo that ROM-1 functions through complex formation, using a stabilized chimera that rescued rds+/- but not rds-/- mice.","evidence":"Transgenic mouse rescue, detergent/urea stability titration, and electron microscopy","pmids":["10506174"],"confidence":"High","gaps":["Why the chimera fails in the complete absence of peripherin-2 unresolved","Did not map sub-loop contact residues"]},{"year":2002,"claim":"Revealed a peripherin-2-free pool of ROM-1 in cholesterol-rich membrane rafts, raising the possibility of a regulatory function distinct from the disc-rim complex.","evidence":"Detergent-resistant membrane isolation, sucrose gradients, and cholesterol depletion","pmids":["12196538"],"confidence":"Medium","gaps":["The proposed regulatory role in fusion was inferred, not tested","Functional significance of the raft pool unknown"]},{"year":2006,"claim":"Demonstrated that ROM-1 has autonomous outer-segment sorting/transport signals and that it potentiates peripherin-2-dependent membrane fusion, assigning ROM-1 active trafficking and fusogenic functions.","evidence":"Cell-free fusion assays with proteoliposomes and localization in rhodopsin- and peripherin-2-null mice","pmids":["17055485","16639027"],"confidence":"Medium","gaps":["The identity of ROM-1's sorting signal was not defined","The in vitro fusion mechanism was not linked to in vivo disc morphogenesis"]},{"year":2015,"claim":"Linked peripherin-2 glycosylation to RDS·ROM-1 complex stability, showing a cone-specific dependence with reduced RDS and ROM-1 levels when glycosylation is lost.","evidence":"N229S knockin mice, ERG, and Western blot in nrl-/- background","pmids":["26420485"],"confidence":"Medium","gaps":["Did not establish whether ROM-1 changes are direct or secondary to RDS loss","Cone-specific mechanism not fully resolved"]},{"year":2017,"claim":"Established ROM-1 as a context-dependent modifier of adRP and pattern-dystrophy peripherin-2 mutants — opposing outer-segment targeting of some misfolded mutants while rescuing ER retention of Y141C — defining a bidirectional regulatory role.","evidence":"Co-IP, rod OS targeting assays, and Y141C knockin/ROM-1 knockout mouse crosses with ERG","pmids":["28539581","28053051"],"confidence":"Medium","gaps":["Mechanism by which ROM-1 promotes versus opposes targeting unresolved","Generalizability across mutant classes untested"]},{"year":2018,"claim":"Proved in vivo that the Prph2-C150/Rom1-C153 disulfide is required for higher-order covalent complexes and normal outer-segment structure, with cones more sensitive than rods to loss of large complexes.","evidence":"C150S-Prph2 knockin mouse, ERG, immunofluorescence, and oligomerization analysis","pmids":["29961824"],"confidence":"High","gaps":["Structural basis for cone sensitivity not defined","Did not resolve ROM-1's independent contribution to the disulfide network"]},{"year":2019,"claim":"Placed ROM-1 as a determinant of the secretory route (conventional vs Golgi-bypass) used by PRPH2 complexes and showed its ablation converts a macular/pattern-dystrophy phenotype to rod-dominant RP.","evidence":"Chimeric and Y141C knockin mice, ROM-1 knockout crosses, ERG, and secretory pathway analysis","pmids":["30307502"],"confidence":"High","gaps":["Molecular machinery routing PRPH2 between pathways not identified","How ROM-1 selects the pathway is unknown"]},{"year":2020,"claim":"Demonstrated that ROM-1 modifies PRPH2 disease in a strictly mutation-specific manner — improving, worsening, or not affecting function depending on the allele — while being dispensable in wild-type retina.","evidence":"Three Prph2 knockin models crossed with Rom1+/-, ERG, and oligomerization analysis","pmids":["32716032"],"confidence":"High","gaps":["Why effects are allele-specific mechanistically unresolved","Therapeutic implications of ROM-1 dosing untested"]},{"year":2022,"claim":"Provided the structural framework: cryo-EM of PRPH2–ROM1 heterodimers and curved cysteine-linked oligomers with a C-terminal-helix micelle supports a direct membrane-remodeling role and localizes disease mutations to the dimer interface.","evidence":"Single-particle cryo-electron microscopy","pmids":["36351012"],"confidence":"High","gaps":["Did not resolve how curvature is templated into disc rims in vivo","Functional state of negatively curved oligomers unclear"]},{"year":2023,"claim":"Showed ROM-1 is a building-block redundant to PRPH2 in disc-rim formation: its loss delays enclosure and produces incisure-less large discs, rescued by excess PRPH2, with a PRPH2-body chimera substituting for ROM-1.","evidence":"ROM1 knockout, PRPH2-overexpression rescue, and chimeric knockin mice with EM disc morphology","pmids":["37991486"],"confidence":"High","gaps":["Non-redundant ROM-1-specific functions in disc enclosure not fully delineated","Mechanism of incisure formation unresolved"]},{"year":2025,"claim":"Refined the timing and a new function of ROM-1: it incorporates at the disc-enclosure stage rather than in nascent lamellae, and its tetraspanin domain is sufficient to restore CNG channel β1 delivery to the outer segment.","evidence":"Co-immunostaining with prominin-1 plus EM; CNGβ1 rescue with peripherin-2/ROM-1 tetraspanin chimeras (one preprint)","pmids":["40801673","41256556"],"confidence":"Medium","gaps":["CNG channel delivery role rests on a single preprint chimera study","How the tetraspanin domain mediates CNGβ1 localization is unknown"]},{"year":null,"claim":"It remains unresolved how ROM-1's autonomous sorting signal and pathway-selection function are encoded at the sequence level, and whether complete ROM1 loss is sufficient to cause human macular dystrophy.","evidence":"","pmids":[],"confidence":"Low","gaps":["The single human ROM1 loss-of-function case lacks direct molecular-mechanism validation","ROM-1's sorting signal and pathway-selection determinants are not mapped"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[0,1,16,21]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[12,13,17]}],"localization":[{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[6,10,20]},{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,6]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[13]}],"pathway":[{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[16,20]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[10,12,21]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[3,13,17,19]},{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[11,16]}],"complexes":["PRPH2-ROM1 disc-rim tetramer/oligomer"],"partners":["PRPH2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q03395","full_name":"Rod outer segment membrane protein 1","aliases":["Tetraspanin-23","Tspan-23"],"length_aa":351,"mass_kda":37.2,"function":"Plays a role in rod outer segment (ROS) morphogenesis (By similarity). May play a role with PRPH2 in the maintenance of the structure of ROS curved disks (By similarity). Plays a role in the organization of the ROS and maintenance of ROS disk diameter (By similarity). 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Section D, Biological crystallography","url":"https://pubmed.ncbi.nlm.nih.gov/16699189","citation_count":6,"is_preprint":false},{"pmid":"37991486","id":"PMC_37991486","title":"ROM1 is redundant to PRPH2 as a molecular building block of photoreceptor disc rims.","date":"2023","source":"eLife","url":"https://pubmed.ncbi.nlm.nih.gov/37991486","citation_count":5,"is_preprint":false},{"pmid":"29155698","id":"PMC_29155698","title":"BULL'S EYE MACULOPATHY WITH MUTATIONS IN RDS/PRPH2 AND ROM-1.","date":"2018","source":"Retinal cases & brief reports","url":"https://pubmed.ncbi.nlm.nih.gov/29155698","citation_count":5,"is_preprint":false},{"pmid":"27858176","id":"PMC_27858176","title":"Serum level of reactive oxygen metabolites (ROM) at 12 weeks of treatment with biologic agents for rheumatoid arthritis is a novel predictor for 52-week remission.","date":"2016","source":"Clinical rheumatology","url":"https://pubmed.ncbi.nlm.nih.gov/27858176","citation_count":5,"is_preprint":false},{"pmid":"9677563","id":"PMC_9677563","title":"[Mutational screening of peripherin/RDS genes, rhodopsin and ROM-1 in 69 index cases with retinitis pigmentosa and other retinal dystrophies].","date":"1998","source":"Klinische Monatsblatter fur Augenheilkunde","url":"https://pubmed.ncbi.nlm.nih.gov/9677563","citation_count":5,"is_preprint":false},{"pmid":"11875761","id":"PMC_11875761","title":"Distinct histopathological patterns in single lesion leprosy patients treated with single dose therapy (ROM) in the Brazilian Multicentric Study.","date":"2001","source":"International journal of leprosy and other mycobacterial diseases : official organ of the International Leprosy Association","url":"https://pubmed.ncbi.nlm.nih.gov/11875761","citation_count":5,"is_preprint":false},{"pmid":"12464018","id":"PMC_12464018","title":"Autosomal dominant retinal dystrophy (Rdy) in Abyssinian cats: exclusion of PDE6G and ROM1 and likely exclusion of Rhodopsin as candidate genes.","date":"2002","source":"Animal genetics","url":"https://pubmed.ncbi.nlm.nih.gov/12464018","citation_count":4,"is_preprint":false},{"pmid":"24473193","id":"PMC_24473193","title":"O ROM(e)O1, ROM(e)O1, wherefore art thou ROM(e)O1?","date":"2014","source":"Science signaling","url":"https://pubmed.ncbi.nlm.nih.gov/24473193","citation_count":3,"is_preprint":false},{"pmid":"9745671","id":"PMC_9745671","title":"Evaluation of ROM1 as a candidate gene in generalised progressive retinal atrophy in dogs.","date":"1998","source":"Animal genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9745671","citation_count":3,"is_preprint":false},{"pmid":"39519379","id":"PMC_39519379","title":"Anti-Pruritic and Immunomodulatory Effects of Coix [Coix lacryma-jobi L. var. ma-yuen (Rom. Caill.) Stapf.] Sprouts Extract.","date":"2024","source":"International journal of molecular sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39519379","citation_count":3,"is_preprint":false},{"pmid":"40801673","id":"PMC_40801673","title":"Peripherin-2 and ROM1 Incorporate Directly Into the Rims of Enclosing Photoreceptor Discs Without Accumulating in the Nascent Disc Lamellae.","date":"2025","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/40801673","citation_count":2,"is_preprint":false},{"pmid":"1817515","id":"PMC_1817515","title":"[Replication of ColE 1-related plasmids at increased growth temperature depending on rom function].","date":"1991","source":"Zeitschrift fur Naturforschung. C, Journal of biosciences","url":"https://pubmed.ncbi.nlm.nih.gov/1817515","citation_count":2,"is_preprint":false},{"pmid":"38158174","id":"PMC_38158174","title":"Identification and cellular localization in Xenopus laevis photoreceptors of three Peripherin-2 family members, Prph2, Rom1 and Gp2l, which arose from gene duplication events in the common ancestors of jawed vertebrates.","date":"2023","source":"Experimental eye research","url":"https://pubmed.ncbi.nlm.nih.gov/38158174","citation_count":1,"is_preprint":false},{"pmid":"16129040","id":"PMC_16129040","title":"[Scavenger of reactive oxygen metabolites reverses the ROM induced inhibition of NK cell-mediated killing effect on K562 cell in vitro].","date":"2005","source":"Zhongguo shi yan xue ye xue za zhi","url":"https://pubmed.ncbi.nlm.nih.gov/16129040","citation_count":1,"is_preprint":false},{"pmid":"34136005","id":"PMC_34136005","title":"Safety evaluation of the food enzyme maltogenic α-amylase from the genetically modified Bacillus subtilis strain ROM.","date":"2021","source":"EFSA journal. European Food Safety Authority","url":"https://pubmed.ncbi.nlm.nih.gov/34136005","citation_count":1,"is_preprint":false},{"pmid":"37440045","id":"PMC_37440045","title":"The Role of Peripherin-2/ROM1 Complexes in Photoreceptor Outer Segment Disc Morphogenesis.","date":"2023","source":"Advances in experimental medicine and biology","url":"https://pubmed.ncbi.nlm.nih.gov/37440045","citation_count":0,"is_preprint":false},{"pmid":"41256556","id":"PMC_41256556","title":"The tetraspanin disc proteins, peripherin-2 and ROM1, facilitate CNG channel localization to the rod outer segment.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/41256556","citation_count":0,"is_preprint":false},{"pmid":"21118394","id":"PMC_21118394","title":"Imaging the dynamics of intracellular protein translocation by photoconversion of phamret-cybr/ROM.","date":"2010","source":"Journal of microscopy","url":"https://pubmed.ncbi.nlm.nih.gov/21118394","citation_count":0,"is_preprint":false},{"pmid":"41280796","id":"PMC_41280796","title":"Graphene Oxide (GO) Coating on Reticulated Open-Cell Mullite (ROM) Foams for Enhancing Antibacterial Activity.","date":"2025","source":"ACS omega","url":"https://pubmed.ncbi.nlm.nih.gov/41280796","citation_count":0,"is_preprint":false},{"pmid":"11151159","id":"PMC_11151159","title":"[Retinitis pigmentosa, pattern dystrophy and fundus flavimaculatus not related to mutations in rhodopsine, peripherin/RDS and ROM-1 genes].","date":"2000","source":"Archivos de la Sociedad Espanola de Oftalmologia","url":"https://pubmed.ncbi.nlm.nih.gov/11151159","citation_count":0,"is_preprint":false},{"pmid":"241067","id":"PMC_241067","title":"The pharmacology of new ethylenediamine derivatives (ROM-126, ROM-131, MK-142) with antiarrhythmic action. Part I. General pharmacological properties.","date":"1975","source":"Polish journal of pharmacology and pharmacy","url":"https://pubmed.ncbi.nlm.nih.gov/241067","citation_count":0,"is_preprint":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":46489,"output_tokens":6278,"usd":0.116819,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":15270,"output_tokens":5591,"usd":0.108063,"stage2_stop_reason":"end_turn"},"total_usd":0.224882,"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\": 1992,\n      \"finding\": \"ROM-1 is a 37 kDa integral membrane protein localized to the photoreceptor disk rim, structurally similar to peripherin/RDS (35% identical), similarly oriented in the membrane with a conserved cysteine- and proline-rich domain in the disk lumen. ROM-1 forms disulfide-linked homodimers but does not form heterodimers with peripherin via disulfide bonds; instead the two proteins associate noncovalently.\",\n      \"method\": \"Protein characterization, subcellular localization, biochemical fractionation, SDS-PAGE under reducing/non-reducing conditions\",\n      \"journal\": \"Neuron\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal biochemical methods in the original cloning paper, replicated across many subsequent studies\",\n      \"pmids\": [\"1610568\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The peripherin/RDS–ROM-1 complex from bovine rod outer segment membranes is a tetramer with a protein mass of ~135 kDa, as determined by hydrodynamic analysis (Stokes radius 6.2 nm, sedimentation coefficient 5.8 S). The complex is present at high surface density (~4100/µm²) at disk rims and comprises ~4% of total bovine ROS membrane protein.\",\n      \"method\": \"Gel exclusion chromatography, velocity sedimentation through H₂O- and D₂O-based sucrose gradients, competitive ELISA, immunoaffinity purification\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — rigorous hydrodynamic reconstitution with multiple orthogonal methods; replicated by subsequent studies\",\n      \"pmids\": [\"8634257\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"When peripherin/RDS and ROM-1 cDNAs are co-expressed in COS-1 cells, they assemble into a stable tetrameric complex (4.9 S) with stoichiometry similar to native ROS membranes. Individually, peripherin/RDS (5.1 S) and ROM-1 (4.3 S) each form homotetramers. Recombinant peripherin/RDS is glycosylated while ROM-1 is not, mirroring the native proteins.\",\n      \"method\": \"Velocity sedimentation, Western blot, immunofluorescence microscopy, co-transfection in COS-1 cells\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods, replicated across labs\",\n      \"pmids\": [\"7578020\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"The peripherin/RDS L185P mutant associated with digenic retinitis pigmentosa fails to form native homotetramers on its own, but can assemble with wild-type ROM-1 to form a structurally normal heterotetrameric complex. This conditional assembly defect provides the molecular basis for digenic RP requiring co-inheritance of mutations in both genes.\",\n      \"method\": \"Sedimentation velocity analysis of heterologously expressed proteins in COS-1 cells\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — sedimentation velocity in heterologous expression system, single lab but clear mechanistic finding replicated in follow-up studies\",\n      \"pmids\": [\"8943002\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Under reducing conditions, peripherin/RDS and ROM-1 exist as homomeric and heteromeric noncovalent core complexes (tetramers). Under non-reducing conditions, core complexes associate via intermolecular disulfide bonds (through Cys-150 of peripherin/RDS) to form higher-order oligomers. ROM-1 shows little tendency to form disulfide-linked oligomers on its own; larger oligomers consist only of disulfide-linked peripherin/RDS dimers. Disc membranes contain twice as much peripherin/RDS as ROM-1.\",\n      \"method\": \"Velocity sedimentation, SDS-gel electrophoresis under reducing/non-reducing conditions, immunoaffinity chromatography, chemical cross-linking, COS-1 cell expression\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods, rigorous controls with reducing/non-reducing conditions and mutagenesis implications\",\n      \"pmids\": [\"10681511\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Leu-185 of peripherin-2 (and corresponding Leu-188 of ROM-1) is critical for tetramer formation but not for dimer formation. The L185P and L185A peripherin-2 mutants and L188P ROM-1 mutant form noncovalent dimers but fail to assemble into core tetramers. The G113E ROM-1 mutation is expressed 20-fold lower than wild-type, behaving mechanistically as a null allele. Peripherin-2-containing tetramers are required for higher-order disulfide-linked oligomer formation.\",\n      \"method\": \"Velocity sedimentation, co-immunoprecipitation, chemical cross-linking of heterologously expressed proteins\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution with mutagenesis, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"11297544\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"ROM-1 membrane topology shows the C-terminus localized to the cytoplasmic side of the disc membrane and a large segment localized to the lumen side. ROM-1 is localized to the rim region of both rod and cone outer segment disc membranes by immunogold electron microscopy. In heterologously expressed mammalian cells, ROM-1 is retained in internal cellular membranes and not translocated to the plasma membrane. All ROM-1 and peripherin/RDS from rod outer segments form a tightly associated complex by immunoprecipitation.\",\n      \"method\": \"Proteolytic digestion studies, immunolabeling, pre- and post-embedding immunogold electron microscopy, immunofluorescence, immunoprecipitation\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including EM-level localization and biochemical co-IP, replicated across studies\",\n      \"pmids\": [\"8603840\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"A fraction of ROM-1 (13–23%) associates with Triton X-100-resistant membrane rafts (enriched in cholesterol and sphingomyelin) from rod outer segment disk membranes. Peripherin/RDS is entirely absent from these raft domains. Cholesterol depletion with methyl-β-cyclodextran reduces ROM-1 (specifically the dimeric form) in the raft fraction and collapses the caveolin complex. This pool of ROM-1 may play a regulatory role in peripherin/RDS-dependent membrane fusion.\",\n      \"method\": \"Detergent-resistant membrane isolation, sucrose density gradients, biochemical lipid analysis, cholesterol depletion\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — clean fractionation with lipid analysis, single lab, functional interpretation is proposed but not directly tested\",\n      \"pmids\": [\"12196538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ROM-1 potentiates peripherin/RDS-dependent membrane fusion. Co-expression of ROM-1 and peripherin/RDS yields the highest membrane fusogenicity in a cell-free fusion assay. Proteoliposomes containing ROM-1 alone are not fusogenic, while those containing the ROM-1/peripherin/RDS complex show optimal fusion. Peptide competition studies suggest that ROM-1 optimizes fusion by facilitating formation of a fusion-competent peripherin/RDS C-terminus.\",\n      \"method\": \"COS cell heterologous expression, cell-free fusion assay with fluorescently labeled outer segment plasma membranes and proteoliposomes, peptide competition\",\n      \"journal\": \"Experimental eye research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — in vitro fusion assay with specific controls, single lab, functional consequence demonstrated\",\n      \"pmids\": [\"17055485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"A chimeric protein (rom/D2) containing the intradiscal D2 loop of peripherin/RDS in the context of ROM-1 interacted more stably with peripherin/RDS than wild-type ROM-1. This chimera fully rescued the ultrastructural phenotype in rds+/- mice but had no effect in rds-/- mice. These data indicate that peripherin/RDS interacts noncovalently with itself and ROM-1 via the D2 loop and that peripherin/RDS is present at 2.5-fold higher levels than ROM-1 in vivo.\",\n      \"method\": \"Transgenic mouse expression, detergent/urea titration for stability, immunoprecipitation, electron microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transgenic rescue experiments combined with biochemical interaction analysis, in vivo validation\",\n      \"pmids\": [\"10506174\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"ROM-1 transport to the outer segment occurs independently of rhodopsin. In rhodopsin-knockout mice, ROM-1 localizes to ciliary membranes at the distal cilium tip where outer segment-like protrusions form. In rds (peripherin/RDS-null) mice, ROM-1 accumulates in distal ciliary membranes, indicating ROM-1 possesses its own sorting and transport signals independent of peripherin/RDS.\",\n      \"method\": \"Immunohistochemistry, electron microscopy, analysis of rhodopsin-knockout and peripherin/RDS-knockout mouse models\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockout models with direct localization experiments, multiple genotypes tested\",\n      \"pmids\": [\"16639027\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The intermolecular disulfide bond at Prph2-C150/Rom1-C153 is required for higher-order covalent Prph2/Rom1 complex formation and for normal OS structure and function. C150S-Prph2 traffics to the OS and interacts with Rom1 to form non-covalent tetramers, but cannot support normal OS structure alone. Cones are especially sensitive to lack of large Prph2 complexes compared to rods. C150S-Prph2 supports haploinsufficiency in rods but a dominant-negative phenotype in cones.\",\n      \"method\": \"Knockin mouse model, electroretinography, immunofluorescence, biochemical analysis of oligomerization\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockin mouse with specific cysteine mutation, multiple readouts including structure, function, and biochemistry\",\n      \"pmids\": [\"29961824\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The Prph2 C-terminus is necessary and sufficient for initiation of photoreceptor outer segments, while OS maturation requires the body of Prph2 and associated large oligomers. ROM-1 is a key determinant of whether Prph2 complexes utilize conventional versus unconventional (Golgi bypass) secretory pathways to reach the OS. Ablating ROM-1 in Prph2Y/+ mice (Y141C knockin) eliminates abnormal Prph2/ROM1 complexes and converts the macular dystrophy/pattern dystrophy phenotype to a rod-dominant retinitis pigmentosa phenotype.\",\n      \"method\": \"Chimeric knockin mouse, ROM-1 knockout crosses, electroretinography, immunofluorescence, biochemical complex analysis, secretory pathway analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models with in vivo functional and biochemical readouts, two orthogonal experimental approaches\",\n      \"pmids\": [\"30307502\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"ROM-1 modifies the phenotype of the Y141C-Prph2 mutation: co-expression of ROM-1 rescues Y141C-Prph2 retention in the endoplasmic reticulum. In heterozygous Y141C knockin mice, Y141C-Prph2 and ROM-1 form abnormal complexes. Ablation of ROM-1 in Y141C Prph2 heterozygous mice eliminates abnormal complexes, reduces total Prph2 to haploinsufficient levels, and shifts the phenotype from cone-rod (pattern dystrophy) to rod-dominant (retinitis pigmentosa).\",\n      \"method\": \"Co-expression in vitro, knockin/knockout mouse crosses, electroretinography, biochemical complex analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vitro and in vivo approaches, multiple orthogonal methods, mechanistic pathway placement\",\n      \"pmids\": [\"28053051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Peripherin-2 mutants P210L and C214S are misfolded and show decreased binding to wild-type peripherin-2 and ROM-1. Both mutants preferentially form non-covalent mutant-mutant and wild-type-mutant dimers, and also ROM-1–mutant dimers. Only wild-type/mutant peripherin-2 dimers, not ROM-1/mutant dimers, can be targeted to murine rod outer segments. This reveals opposing roles: peripherin-2 promotes, while ROM-1 opposes, OS targeting of these adRP-linked peripherin-2 mutants.\",\n      \"method\": \"Co-immunoprecipitation, protein assembly analysis, rod OS targeting assays in murine photoreceptors\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-IP plus in vivo OS targeting, single lab, multiple mutants tested\",\n      \"pmids\": [\"28539581\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Cryo-EM structures of PRPH2-ROM1 reveal that they form heterodimers and higher-order oligomers. High-risk mutations causing blindness map to the protein-dimer interface. Cysteine bridges connect dimers into positively curved oligomers; negatively curved oligomers were also observed. Hexamers and octamers exhibit a secondary micelle enveloping four carboxyl-terminal helices, supporting a role in membrane remodeling.\",\n      \"method\": \"Single-particle cryo-electron microscopy\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — cryo-EM structural determination with functional mapping of disease mutations, single study\",\n      \"pmids\": [\"36351012\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ROM1 knockout mice show compensatory increased disc content of PRPH2 but display delayed disc enclosure with large-diameter discs lacking incisures. Increasing PRPH2 levels rescues these morphological defects. A knockin mouse in which the tetraspanin body of PRPH2 is replaced with that of ROM1 still forms disc rims, demonstrating that ROM1 is redundant to PRPH2 as a molecular building block of disc rims when PRPH2 is in excess.\",\n      \"method\": \"ROM1 knockout mouse, PRPH2-overexpression rescue, PRPH2/ROM1 chimeric knockin mouse, electron microscopy, disc morphology analysis\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple genetic models with quantitative morphological readouts, in vivo rescue experiments\",\n      \"pmids\": [\"37991486\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Reducing ROM-1 levels (Rom1+/-) has no effect on retinal structure or function in the absence of Prph2 mutations, but modifies the phenotype of specific Prph2 mutations in a mutation-specific manner: reducing ROM-1 in Prph2K153Del mice improved rod and cone function and ameliorated K153Del-associated oligomerization defects; reducing ROM-1 in Prph2R172W mice worsened rod and cone function; ROM-1 reduction had no effect in Prph2C213Y mice.\",\n      \"method\": \"Knockin and knockout mouse crosses, electroretinography, biochemical PRPH2/ROM1 oligomerization analysis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — three independent knockin models crossed with ROM-1 heterozygous knockout, multiple functional and biochemical readouts\",\n      \"pmids\": [\"32716032\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RDS/PRPH2 glycosylation regulates RDS·ROM-1 complex formation, particularly in cones. In N229S knockin mice (unglycosylated RDS), cone electroretinogram responses were decreased by 40%. In the nrl-/- background, both RDS and ROM-1 protein levels were decreased by ~60%, suggesting glycosylation of RDS is required for RDS stability/function in cones and affects the RDS·ROM-1 complex.\",\n      \"method\": \"Knockin mouse model, electroretinography, Western blot analysis, nrl-/- background crosses\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockin mouse with functional and biochemical readouts, cone-specific effect demonstrated\",\n      \"pmids\": [\"26420485\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A dominant missense mutation in Rom1 (Trp182Arg, Rom1Rgsc1156) causes progressive retinal degeneration. The W182R substitution leads to decreased protein levels of both ROM-1 and peripherin/RDS, reduction in peripherin/RDS-containing tetramers at disc rims, and unstable disorganized outer segments. ROM-1 and peripherin/RDS immunoreactivity were both decreased in mutant retinas.\",\n      \"method\": \"N-ethyl-N-nitrosourea mutagenesis screen, positional cloning, immunohistochemistry, Western blot, electron microscopy, electroretinography\",\n      \"journal\": \"Molecular vision\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo mouse model with multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"20300562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ROM-1 incorporates directly into the rims of discs undergoing enclosure rather than accumulating in the lamellae of nascent discs prior to their enclosure. Immunostaining shows minimal overlap between ROM-1 and prominin-1 (a nascent disc marker); ROM-1 is detected more distally where discs undergo enclosure, mirroring peripherin-2 localization.\",\n      \"method\": \"Co-immunostaining of endogenous and myc-tagged proteins with prominin-1, adeno-associated virus transduction of myc-tagged peripherin-2, electron microscopy confirmation of ultrastructure\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct co-localization with disc stage marker, electron microscopy validation, single study\",\n      \"pmids\": [\"40801673\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ROM-1's tetraspanin domain is sufficient to restore CNG channel β1 subunit localization to the rod outer segment in peripherin-2 (Rds) knockout rods, acting redundantly with peripherin-2's tetraspanin domain in this function. ROM-1 chimeras containing the tetraspanin region could restore CNGβ1 outer segment localization, indicating a structural role for disc tetraspanins in CNG channel delivery.\",\n      \"method\": \"Overexpression of MYC-tagged CNGβ1 in Rds knockout rods, expression of peripherin-2 and ROM-1 chimeras, immunostaining\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — chimera experiments in vivo, single preprint study, novel functional finding\",\n      \"pmids\": [\"41256556\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A homozygous frameshift mutation in ROM1 (c.712delC, p.Leu238Cysfs*78) causing early protein termination is sufficient to cause late-onset pattern macular dystrophy in the absence of any other plausible candidate gene mutations, establishing that complete loss of ROM1 function alone can cause macular dystrophy.\",\n      \"method\": \"Whole-exome sequencing, clinical characterization including electroretinogram, fundus autofluorescence, OCT\",\n      \"journal\": \"Cold Spring Harbor molecular case studies\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single patient case report, genetic finding without direct molecular mechanism experiment\",\n      \"pmids\": [\"30630813\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1993,\n      \"finding\": \"The human ROM1 gene is located on chromosome 11q13 and the murine Rom1 gene on mouse chromosome 19. The ROM1 coding region is contained within ~1.8 kb of genomic DNA with only two introns, with perfect conservation of intron splice sites with the RDS gene. The predicted pI difference between ROM-1 and peripherin in the conserved central hydrophilic domain (5.2 vs 8.2) may mediate their noncovalent association.\",\n      \"method\": \"Gene cloning, genomic sequencing, comparative sequence analysis, somatic cell hybrid mapping\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — gene structure determination with functional inference regarding protein-protein interaction; replicated by chromosomal mapping\",\n      \"pmids\": [\"8504299\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ROM1 is a photoreceptor-specific tetraspanin integral membrane protein that localizes to the rim regions of rod (and cone) outer segment disc membranes, where it forms noncovalent heterotetramers with the homologous protein peripherin-2 (PRPH2); these core tetramers further associate through peripherin-2-specific intermolecular disulfide bonds (at Cys-150) to form higher-order oligomers essential for disc enclosure and outer segment morphogenesis, with ROM1 also functioning as a regulator of PRPH2 complex type, secretory trafficking pathway, and CNG channel delivery to the outer segment, and acting as a phenotypic modifier of PRPH2-associated retinal disease in a mutation-specific manner.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"ROM1 (ROM-1) is a photoreceptor disc-rim tetraspanin integral membrane protein that, together with the homologous protein peripherin-2/RDS (PRPH2), governs the structural organization of rod and cone outer segment disc membranes [#0, #6]. ROM-1 and peripherin-2 assemble into noncovalent core tetramers — both as homotetramers and as mixed heterotetramers — with a stoichiometry matching native rod outer segment membranes, and Leu-188 of ROM-1 (corresponding to Leu-185 of peripherin-2) is essential for the dimer-to-tetramer transition [#1, #2, #5]. These core tetramers further associate into higher-order oligomers, but covalent oligomerization depends on peripherin-2 intermolecular disulfide bonds at Cys-150 (paired with ROM-1 Cys-153); ROM-1 itself shows little tendency to form disulfide-linked oligomers, and disc membranes contain roughly twice as much peripherin-2 as ROM-1 [#4, #11]. Cryo-EM of PRPH2–ROM1 confirms heterodimers and curved disulfide-linked oligomers whose carboxyl-terminal helices are enveloped by a secondary micelle, consistent with a membrane-remodeling role, and disease mutations map to the dimer interface [#15]. Functionally, ROM-1 potentiates peripherin-2-dependent membrane fusion and incorporates directly into the rims of discs undergoing enclosure, where loss of ROM-1 delays disc enclosure and produces large incisure-less discs that are rescued by excess PRPH2 — establishing ROM-1 as a building block redundant to PRPH2 in disc-rim formation [#8, #16, #20]. ROM-1 carries its own outer-segment sorting signals independent of peripherin-2 and rhodopsin [#10], regulates which secretory pathway PRPH2 complexes use to reach the outer segment, and contributes a tetraspanin-domain-dependent role in delivering the CNG channel β1 subunit to the outer segment [#12, #21]. ROM-1 acts as a mutation-specific modifier of PRPH2-associated retinal disease, shifting cone-rod/macular phenotypes toward rod-dominant retinitis pigmentosa when ablated, and can improve or worsen function depending on the PRPH2 allele [#12, #13, #17]; a dominant Rom1 W182R mutation causes progressive retinal degeneration with destabilized peripherin-2 tetramers and disorganized outer segments [#19].\",\n  \"teleology\": [\n    {\n      \"year\": 1992,\n      \"claim\": \"Established that ROM-1 is a distinct disc-rim integral membrane protein homologous to peripherin/RDS but assembling with it noncovalently rather than via disulfide bonds, defining the molecular unit of the disc rim.\",\n      \"evidence\": \"Protein characterization, subcellular fractionation, and SDS-PAGE under reducing/non-reducing conditions\",\n      \"pmids\": [\"1610568\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve the oligomeric state of the native complex\", \"No structural model of the interaction interface\"]\n    },\n    {\n      \"year\": 1993,\n      \"claim\": \"Mapped the human ROM1 gene to 11q13 and showed conserved gene structure with RDS, supporting the inference that a charge difference in the conserved central domain mediates noncovalent peripherin-2 association.\",\n      \"evidence\": \"Gene cloning, genomic sequencing, and somatic cell hybrid mapping\",\n      \"pmids\": [\"8504299\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The proposed pI-driven association mechanism was inferential, not directly tested\", \"No functional assay of the central domain\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Showed that co-expressed peripherin-2 and ROM-1 self-assemble into a stable tetramer matching native stoichiometry, demonstrating the complex is intrinsic to the two proteins.\",\n      \"evidence\": \"Velocity sedimentation and co-transfection in COS-1 cells\",\n      \"pmids\": [\"7578020\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish higher-order oligomer architecture\", \"Functional consequence of tetramer formation untested\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Defined the native complex as a ~135 kDa tetramer at high disc-rim surface density and established membrane topology with the C-terminus cytoplasmic, placing the complex spatially and quantitatively in the outer segment.\",\n      \"evidence\": \"Hydrodynamic analysis, immunogold electron microscopy, and proteolytic topology mapping\",\n      \"pmids\": [\"8634257\", \"8603840\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address higher-order oligomerization beyond the tetramer\", \"Mechanism linking complex to disc-rim curvature unresolved\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Provided the molecular basis of digenic retinitis pigmentosa by showing the assembly-defective peripherin-2 L185P mutant cannot homotetramerize but is rescued into a normal heterotetramer by wild-type ROM-1.\",\n      \"evidence\": \"Sedimentation velocity analysis of mutants in COS-1 cells\",\n      \"pmids\": [\"8943002\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not test the assembly defect in vivo\", \"Did not identify which residues drive heterotetramer rescue\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Distinguished noncovalent core tetramers from covalently linked higher-order oligomers, identifying peripherin-2 Cys-150 disulfide bonds as the driver of large oligomers that ROM-1 cannot form alone.\",\n      \"evidence\": \"Velocity sedimentation, non-reducing SDS-PAGE, cross-linking, and immunoaffinity chromatography\",\n      \"pmids\": [\"10681511\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo requirement of the disulfide for disc structure not yet demonstrated\", \"Functional role of ROM-1's limited oligomerization unclear\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Pinpointed Leu-185/Leu-188 as the residue required for the dimer-to-tetramer transition and showed peripherin-2 tetramers are obligatory for higher-order oligomers, ordering the assembly hierarchy.\",\n      \"evidence\": \"Velocity sedimentation, co-IP, and cross-linking of mutants in heterologous cells\",\n      \"pmids\": [\"11297544\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Assembly hierarchy not validated in photoreceptors at the time\", \"Did not address how oligomers shape disc rims\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identified the intradiscal D2 loop as the peripherin-2 noncovalent interaction surface and confirmed in vivo that ROM-1 functions through complex formation, using a stabilized chimera that rescued rds+/- but not rds-/- mice.\",\n      \"evidence\": \"Transgenic mouse rescue, detergent/urea stability titration, and electron microscopy\",\n      \"pmids\": [\"10506174\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why the chimera fails in the complete absence of peripherin-2 unresolved\", \"Did not map sub-loop contact residues\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Revealed a peripherin-2-free pool of ROM-1 in cholesterol-rich membrane rafts, raising the possibility of a regulatory function distinct from the disc-rim complex.\",\n      \"evidence\": \"Detergent-resistant membrane isolation, sucrose gradients, and cholesterol depletion\",\n      \"pmids\": [\"12196538\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The proposed regulatory role in fusion was inferred, not tested\", \"Functional significance of the raft pool unknown\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Demonstrated that ROM-1 has autonomous outer-segment sorting/transport signals and that it potentiates peripherin-2-dependent membrane fusion, assigning ROM-1 active trafficking and fusogenic functions.\",\n      \"evidence\": \"Cell-free fusion assays with proteoliposomes and localization in rhodopsin- and peripherin-2-null mice\",\n      \"pmids\": [\"17055485\", \"16639027\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"The identity of ROM-1's sorting signal was not defined\", \"The in vitro fusion mechanism was not linked to in vivo disc morphogenesis\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Linked peripherin-2 glycosylation to RDS·ROM-1 complex stability, showing a cone-specific dependence with reduced RDS and ROM-1 levels when glycosylation is lost.\",\n      \"evidence\": \"N229S knockin mice, ERG, and Western blot in nrl-/- background\",\n      \"pmids\": [\"26420485\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish whether ROM-1 changes are direct or secondary to RDS loss\", \"Cone-specific mechanism not fully resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established ROM-1 as a context-dependent modifier of adRP and pattern-dystrophy peripherin-2 mutants — opposing outer-segment targeting of some misfolded mutants while rescuing ER retention of Y141C — defining a bidirectional regulatory role.\",\n      \"evidence\": \"Co-IP, rod OS targeting assays, and Y141C knockin/ROM-1 knockout mouse crosses with ERG\",\n      \"pmids\": [\"28539581\", \"28053051\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which ROM-1 promotes versus opposes targeting unresolved\", \"Generalizability across mutant classes untested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Proved in vivo that the Prph2-C150/Rom1-C153 disulfide is required for higher-order covalent complexes and normal outer-segment structure, with cones more sensitive than rods to loss of large complexes.\",\n      \"evidence\": \"C150S-Prph2 knockin mouse, ERG, immunofluorescence, and oligomerization analysis\",\n      \"pmids\": [\"29961824\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for cone sensitivity not defined\", \"Did not resolve ROM-1's independent contribution to the disulfide network\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Placed ROM-1 as a determinant of the secretory route (conventional vs Golgi-bypass) used by PRPH2 complexes and showed its ablation converts a macular/pattern-dystrophy phenotype to rod-dominant RP.\",\n      \"evidence\": \"Chimeric and Y141C knockin mice, ROM-1 knockout crosses, ERG, and secretory pathway analysis\",\n      \"pmids\": [\"30307502\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular machinery routing PRPH2 between pathways not identified\", \"How ROM-1 selects the pathway is unknown\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Demonstrated that ROM-1 modifies PRPH2 disease in a strictly mutation-specific manner — improving, worsening, or not affecting function depending on the allele — while being dispensable in wild-type retina.\",\n      \"evidence\": \"Three Prph2 knockin models crossed with Rom1+/-, ERG, and oligomerization analysis\",\n      \"pmids\": [\"32716032\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why effects are allele-specific mechanistically unresolved\", \"Therapeutic implications of ROM-1 dosing untested\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Provided the structural framework: cryo-EM of PRPH2–ROM1 heterodimers and curved cysteine-linked oligomers with a C-terminal-helix micelle supports a direct membrane-remodeling role and localizes disease mutations to the dimer interface.\",\n      \"evidence\": \"Single-particle cryo-electron microscopy\",\n      \"pmids\": [\"36351012\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not resolve how curvature is templated into disc rims in vivo\", \"Functional state of negatively curved oligomers unclear\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed ROM-1 is a building-block redundant to PRPH2 in disc-rim formation: its loss delays enclosure and produces incisure-less large discs, rescued by excess PRPH2, with a PRPH2-body chimera substituting for ROM-1.\",\n      \"evidence\": \"ROM1 knockout, PRPH2-overexpression rescue, and chimeric knockin mice with EM disc morphology\",\n      \"pmids\": [\"37991486\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Non-redundant ROM-1-specific functions in disc enclosure not fully delineated\", \"Mechanism of incisure formation unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Refined the timing and a new function of ROM-1: it incorporates at the disc-enclosure stage rather than in nascent lamellae, and its tetraspanin domain is sufficient to restore CNG channel β1 delivery to the outer segment.\",\n      \"evidence\": \"Co-immunostaining with prominin-1 plus EM; CNG\\u03b21 rescue with peripherin-2/ROM-1 tetraspanin chimeras (one preprint)\",\n      \"pmids\": [\"40801673\", \"41256556\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"CNG channel delivery role rests on a single preprint chimera study\", \"How the tetraspanin domain mediates CNG\\u03b21 localization is unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how ROM-1's autonomous sorting signal and pathway-selection function are encoded at the sequence level, and whether complete ROM1 loss is sufficient to cause human macular dystrophy.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"The single human ROM1 loss-of-function case lacks direct molecular-mechanism validation\", \"ROM-1's sorting signal and pathway-selection determinants are not mapped\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [0, 1, 16, 21]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [12, 13, 17]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [6, 10, 20]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 6]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [16, 20]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [10, 12, 21]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [3, 13, 17, 19]},\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [11, 16]}\n    ],\n    \"complexes\": [\n      \"PRPH2-ROM1 disc-rim tetramer/oligomer\"\n    ],\n    \"partners\": [\n      \"PRPH2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}