{"gene":"REEP6","run_date":"2026-06-10T06:43:36","timeline":{"discoveries":[{"year":2014,"finding":"REEP6 expression in rod photoreceptors is regulated by the bZIP transcription factor NRL, which binds within Reep6 intron 1 to drive expression of the rod-specific isoform REEP6.1 through an intronic enhancer sequence. Chromatin immunoprecipitation identified NRL binding at this site, and reporter assays in cultured cells and retinal explants confirmed NRL-directed REEP6.1 expression.","method":"Chromatin immunoprecipitation (ChIP), reporter assay, retinal explant transfection, 5'-RACE, exon-specific Taqman assay","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal ChIP plus reporter assay in two systems (cultured cells and retinal explants), single lab but multiple orthogonal methods","pmids":["24691551"],"is_preprint":false},{"year":2014,"finding":"Knockdown of Reep6 in mouse and zebrafish resulted in death of retinal cells, establishing a required role for REEP6 in retinal cell survival.","method":"siRNA knockdown in mouse retina; morpholino knockdown in zebrafish","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function with defined cellular phenotype (cell death) in two model organisms, single lab","pmids":["24691551"],"is_preprint":false},{"year":2016,"finding":"REEP6 is a member of the REEP/Yop1 family of ER-shaping proteins and is expressed in the retina as a retina-specific isoform (REEP6.1). Missense variants p.Pro128Leu and p.Leu135Pro and a REEP6.1-specific frameshift mutant expressed in cultured cells destabilize the protein. A knock-in mouse (p.Leu135Pro) shows progressive rod photoreceptor degeneration and dysfunction.","method":"Human 3D organoid optic cups; CRISPR-Cas9 knock-in mouse; overexpression in cultured cells; electroretinography; histology","journal":"American journal of human genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (organoids, knock-in mouse, cell expression assays, ERG), replicated across families and models","pmids":["27889058"],"is_preprint":false},{"year":2017,"finding":"In rod photoreceptors, REEP6 localizes to the inner segment and outer plexiform layer. REEP6 knockout mice show expansion of the distal ER and increased mitochondria number in rods, severely reduced expression of retinal guanylate cyclases GC1 and GC2 (near-undetectable), and ER stress markers (elevated CHOP and activated caspase-12), implicating REEP6 in maintaining cGMP homeostasis through facilitating the stability/trafficking of guanylate cyclases and ER/mitochondrial homeostasis. Rhodopsin, Rom1, and peripherin/rds trafficking were unaffected.","method":"CRISPR/Cas9 knockout mouse; transmission electron microscopy; 3View serial block-face scanning EM; immunofluorescence localization; electroretinography; Western blot for GC1, GC2, CHOP, caspase-12","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR KO mouse with multiple orthogonal structural and biochemical readouts, defined cellular mechanism, single lab but rigorous","pmids":["28475715"],"is_preprint":false},{"year":2017,"finding":"REEP6 is detected in a subset of Clathrin-coated vesicles in rod photoreceptors and interacts with the t-SNARE Syntaxin3. Loss of REEP6 causes aberrant accumulation of vacuole-like structures at the apical inner segment and reduction in selected rod phototransduction proteins.","method":"Co-immunoprecipitation; immunofluorescence colocalization with Clathrin; Reep6 knockout mouse; electroretinography","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP for Syntaxin3 interaction plus KO phenotype, single lab, two orthogonal methods","pmids":["28369466"],"is_preprint":false},{"year":2016,"finding":"REEP6 interacts with CXCR1 (but not CXCR2) and, together with REEP5, facilitates ligand-stimulated endocytosis of CXCR1 and intracellular clustering of β-arrestin2. Depletion of REEP5/REEP6 impairs receptor internalization and reduces IL-8-stimulated ERK phosphorylation and actin polymerization without affecting CXCR1 plasma membrane expression.","method":"Co-immunoprecipitation; siRNA knockdown; overexpression; β-arrestin2 clustering assay; ERK phosphorylation Western blot; in vivo xenograft model","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — Co-IP plus functional knockdown with multiple readouts, single lab","pmids":["27966653"],"is_preprint":false},{"year":2021,"finding":"The retina-specific isoform Reep6.1 (containing exon 5-encoded 27 aa) has rod-specific functions that cannot be substituted by the canonical isoform Reep6.2. Exon-5-specific knockout (Reep6E5/E5) produces rod degeneration comparable to full Reep6 knockout, and overexpression of Reep6.2 fails to rescue this phenotype whereas overexpression of Reep6.1 does rescue it.","method":"Isoform-specific knockout mouse (exon 5 deletion); AAV-mediated overexpression rescue experiment; electroretinography; histology","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — isoform-specific KO plus rescue experiment with both isoforms, multiple orthogonal readouts, single lab","pmids":["34104971"],"is_preprint":false},{"year":2022,"finding":"REEP6 plays a cell-autonomous role in β-adrenergic signal transduction in adipocytes by facilitating the trafficking of adenylate cyclase 3 (ADCY3) to the plasma membrane. REEP6 KO reduces ADCY3 plasma membrane targeting, severely reduces protein kinase A-mediated signaling in brown adipose tissue, and reduces mitochondrial mass. These defects were reproduced in cultured adipocytes, confirming cell autonomy.","method":"REEP6 knockout mouse; high-fat diet model; siRNA knockdown in C3H10T1/2 adipocytes and primary adipocytes; indirect calorimetry; confocal and electron microscopy; Western blot; mitochondrial DNA analysis; plasma membrane fractionation for ADCY3","journal":"Metabolism: clinical and experimental","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse plus cell-autonomous knockdown, plasma membrane fractionation for ADCY3, multiple orthogonal metabolic readouts, single lab","pmids":["35150731"],"is_preprint":false},{"year":2022,"finding":"miR-672-5p directly regulates REEP6 expression in spinal dorsal horn neurons (validated by dual-luciferase reporter assay targeting the REEP6 mRNA 3'UTR). Upregulation of REEP6 in dorsal horn neurons contributes to neuronal hyperexcitability and mechanical allodynia in bortezomib-induced neuropathic pain.","method":"miRNA microarray; PCR; dual-luciferase reporter assay; intrathecal injection of miR-672-5p agomir/antagomir; sEPSC recording; REEP6 overexpression/knockdown in vivo","journal":"Neurochemical research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — luciferase reporter plus in vivo functional experiments, single lab","pmids":["36064821"],"is_preprint":false},{"year":2005,"finding":"The REEP6 ortholog Dp1l1 (TB2-like 1) localizes to the cytoplasm in a punctate pattern in retinal ganglion cells, consistent with a role in intracellular membrane trafficking, as determined by immunohistochemistry and intracellular localization analyses.","method":"In situ hybridization; immunohistochemistry; intracellular localization analysis; radiation hybrid mapping","journal":"Investigative ophthalmology & visual science","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization experiment in two assays, foundational characterization of the ortholog, single lab","pmids":["15728532"],"is_preprint":false},{"year":2026,"finding":"WTAP-mediated m6A methylation facilitates translation of REEP6 (and PDE6B, RDH12) in rod photoreceptors by depositing m6A modifications in the 3'UTR of Reep6 mRNA. Loss of Wtap abolished WTAP-mediated methyltransferase complex stability, reduced m6A levels genome-wide, and caused epigenetic silencing of Reep6 with consequent rod degeneration; AAV-mediated reintroduction of WTAP partially restored REEP6 expression and mitigated degeneration.","method":"Conditional Wtap knockout mouse; m6A-seq; Western blot; AAV gene therapy rescue; ERG","journal":"Science China. Life sciences","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mouse with m6A-seq and rescue experiment, single lab, multiple readouts","pmids":["41796262"],"is_preprint":false},{"year":2025,"finding":"In vitro expression of REEP6 alters ER marker expression and Golgi morphology. In an independent Reep6 knockout mouse, guanylate cyclases are not absent but are reduced ~one-third, rhodopsin and GRK1 are also reduced, PDE6 trafficking is normal (contrasting a prior report), and RNA-seq shows reduced phototransduction gene transcription and activated inflammation pathways, suggesting that REEP6 maintains ER and Golgi function required for expression of membrane phototransduction proteins.","method":"CRISPR/Cas9 Reep6 knockout mouse; in vitro REEP6 overexpression with ER/Golgi marker imaging; Western blot; RNA-seq; electroretinography","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — independent KO model plus in vitro ER/Golgi morphology assay and RNA-seq, preprint not peer-reviewed","pmids":["bio_10.1101_2025.03.02.641069"],"is_preprint":true}],"current_model":"REEP6 is a transmembrane ER-shaping protein of the REEP/Yop1 family whose rod-specific isoform (REEP6.1), transcriptionally activated by the NRL transcription factor via an intronic enhancer and translationally promoted by WTAP-mediated m6A modification, localizes to the inner segment of rod photoreceptors where it maintains ER and Golgi homeostasis, facilitates the stability/trafficking of guanylate cyclases (GC1/GC2) and adenylate cyclase 3, participates in Clathrin-coated vesicle trafficking through interaction with Syntaxin3, and supports CXCR1-mediated endocytosis in non-retinal cells; loss of REEP6 causes ER stress, reduced expression of membrane phototransduction proteins, and progressive rod photoreceptor degeneration."},"narrative":{"mechanistic_narrative":"REEP6 is a transmembrane member of the REEP/Yop1 family of ER-shaping proteins that maintains endoplasmic reticulum and Golgi homeostasis required for the stability and trafficking of membrane signaling enzymes, and is essential for rod photoreceptor survival [PMID:27889058, PMID:28475715]. In the retina, expression is driven by the rod transcription factor NRL, which binds an enhancer within Reep6 intron 1 to activate the rod-specific isoform REEP6.1 [PMID:24691551]; this isoform carries an exon-5-encoded 27-residue segment whose function cannot be substituted by the canonical REEP6.2 isoform, as exon-5-specific knockout phenocopies full knockout and only REEP6.1 rescues the resulting degeneration [PMID:34104971]. Within rods, REEP6 localizes to the inner segment, and its loss expands the distal ER, increases mitochondrial number, triggers ER stress (CHOP, caspase-12), and reduces the guanylate cyclases GC1/GC2 along with other membrane phototransduction proteins, linking REEP6 to cGMP homeostasis and rod viability [PMID:28475715, PMID:bio_10.1101_2025.03.02.641069]. REEP6 participates in vesicular trafficking, residing in a subset of clathrin-coated vesicles and interacting with the t-SNARE Syntaxin3 [PMID:28369466]. Beyond the retina, REEP6 facilitates plasma-membrane trafficking of signaling effectors more broadly: it promotes adenylate cyclase 3 (ADCY3) delivery to support β-adrenergic/PKA signaling in adipocytes [PMID:35150731] and supports CXCR1-mediated endocytosis and β-arrestin2 clustering [PMID:27966653]. Destabilizing missense and frameshift variants cause progressive rod photoreceptor degeneration in patients and a knock-in mouse model [PMID:27889058].","teleology":[{"year":2005,"claim":"Established the first cellular context for the REEP6 ortholog, placing it in intracellular membrane trafficking before its retinal role was known.","evidence":"In situ hybridization, immunohistochemistry and intracellular localization of the ortholog Dp1l1 in retinal ganglion cells","pmids":["15728532"],"confidence":"Medium","gaps":["No molecular partners or trafficking step defined","Ortholog rather than human REEP6 directly characterized"]},{"year":2014,"claim":"Defined how rod-restricted REEP6 expression is achieved and showed it is required for retinal cell survival, connecting a transcriptional program to a functional necessity.","evidence":"ChIP and reporter assays identifying NRL binding in Reep6 intron 1; siRNA/morpholino knockdown in mouse and zebrafish","pmids":["24691551"],"confidence":"High","gaps":["Knockdown phenotype does not reveal the molecular function of REEP6","Mechanism of cell death not resolved"]},{"year":2016,"claim":"Linked REEP6 to human retinal disease and to the ER-shaping REEP/Yop1 family, showing pathogenic variants destabilize the protein and cause rod degeneration.","evidence":"Patient missense/frameshift variants expressed in cells, human organoid optic cups, and a p.Leu135Pro knock-in mouse with ERG/histology","pmids":["27889058"],"confidence":"High","gaps":["Did not identify the trafficking substrates or partners affected","ER-shaping activity inferred from family membership, not directly assayed"]},{"year":2016,"claim":"Demonstrated a non-retinal trafficking role, implicating REEP6 in receptor endocytosis and downstream signaling.","evidence":"Co-IP, siRNA depletion of REEP5/REEP6, β-arrestin2 clustering, ERK phosphorylation and xenograft assays for CXCR1","pmids":["27966653"],"confidence":"Medium","gaps":["Single-lab Co-IP without reciprocal structural validation","Mechanism by which REEP6 promotes internalization not defined"]},{"year":2017,"claim":"Established a concrete molecular mechanism in rods: REEP6 maintains ER/mitochondrial homeostasis and is required for guanylate cyclase stability and cGMP homeostasis.","evidence":"CRISPR knockout mouse with EM, immunofluorescence, ERG, and Western blots for GC1/GC2, CHOP, caspase-12","pmids":["28475715"],"confidence":"High","gaps":["Whether REEP6 directly chaperones GCs or acts indirectly via ER stress unresolved","Discrepancy with later reports on degree of GC loss"]},{"year":2017,"claim":"Placed REEP6 in clathrin-coated vesicle trafficking and identified a SNARE partner, suggesting a vesicular route for delivery of phototransduction proteins.","evidence":"Co-IP with Syntaxin3, clathrin colocalization, and knockout mouse phenotyping","pmids":["28369466"],"confidence":"Medium","gaps":["Single Co-IP for Syntaxin3 without reciprocal validation","Functional consequence of the Syntaxin3 interaction not directly tested"]},{"year":2021,"claim":"Showed the rod-specific isoform REEP6.1 carries the essential activity, defining isoform specialization as functionally non-redundant.","evidence":"Exon-5-specific knockout mouse and AAV rescue with REEP6.1 versus REEP6.2","pmids":["34104971"],"confidence":"High","gaps":["Molecular property conferred by the exon-5 segment not defined","Why REEP6.2 cannot substitute remains mechanistically unexplained"]},{"year":2022,"claim":"Generalized REEP6's trafficking role to a second effector and tissue, showing it delivers ADCY3 to the plasma membrane for β-adrenergic signaling.","evidence":"Knockout mouse and adipocyte knockdown with plasma membrane fractionation for ADCY3 and metabolic/PKA readouts","pmids":["35150731"],"confidence":"High","gaps":["Direct physical interaction between REEP6 and ADCY3 not shown","Whether the same mechanism operates in rods for GCs not established"]},{"year":2022,"claim":"Identified an upstream post-transcriptional regulator of REEP6 in a neuronal pain context, broadening its regulatory landscape.","evidence":"miR-672-5p luciferase reporter targeting the REEP6 3'UTR plus in vivo agomir/antagomir and electrophysiology","pmids":["36064821"],"confidence":"Medium","gaps":["Mechanistic role of REEP6 in neuronal excitability not defined","Relevance to retinal/adipocyte functions unclear"]},{"year":2026,"claim":"Connected an epitranscriptomic mechanism to REEP6 dosage, showing WTAP-mediated m6A in the 3'UTR promotes REEP6 translation and that its loss causes rod degeneration.","evidence":"Conditional Wtap knockout mouse, m6A-seq, Western blot, and AAV rescue with ERG","pmids":["41796262"],"confidence":"Medium","gaps":["Direct effect on REEP6 separated from co-regulated PDE6B/RDH12 not isolated","Single lab, partial rescue only"]},{"year":2025,"claim":"Independent knockout reframed the ER/Golgi-maintenance model, showing reduced (not absent) guanylate cyclases and broadly reduced phototransduction transcription with inflammation activation.","evidence":"Independent CRISPR knockout mouse, in vitro ER/Golgi marker imaging, RNA-seq and ERG (preprint)","pmids":["bio_10.1101_2025.03.02.641069"],"confidence":"Medium","gaps":["Preprint, not peer-reviewed","Conflicts with prior report on GC absence and PDE6 trafficking","Direct cause of transcriptional downregulation unresolved"]},{"year":null,"claim":"Whether REEP6 directly binds the membrane proteins whose trafficking it supports (GCs, ADCY3, rhodopsin/GRK1) or acts indirectly by shaping ER/Golgi and vesicle compartments remains the central open mechanistic question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of REEP6 or its complexes","No demonstrated direct cargo interaction","ER-shaping activity not biochemically reconstituted"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2,3]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[4,7]}],"localization":[{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[2,3,11]},{"term_id":"GO:0005794","term_label":"Golgi apparatus","supporting_discovery_ids":[11]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[4]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[9]}],"pathway":[{"term_id":"R-HSA-5653656","term_label":"Vesicle-mediated transport","supporting_discovery_ids":[4,7]},{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[3,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[5,7]}],"complexes":[],"partners":["STX3","CXCR1","REEP5"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96HR9","full_name":"Receptor expression-enhancing protein 6","aliases":["Polyposis locus protein 1-like 1"],"length_aa":211,"mass_kda":23.4,"function":"Required for correct function and survival of retinal photoreceptors (PubMed:27889058). Required for retinal development (By similarity). In rod photoreceptors, facilitates stability and/or trafficking of guanylate cyclases and is required to maintain endoplasmic reticulum and mitochondrial homeostasis (By similarity). May play a role in clathrin-coated intracellular vesicle trafficking of proteins from the endoplasmic reticulum to the retinal rod plasma membrane (By similarity)","subcellular_location":"Endoplasmic reticulum membrane; Cytoplasmic vesicle, clathrin-coated vesicle membrane","url":"https://www.uniprot.org/uniprotkb/Q96HR9/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/REEP6","classification":"Not Classified","n_dependent_lines":5,"n_total_lines":1208,"dependency_fraction":0.0041390728476821195},"opencell":{"profiled":true,"resolved_as":"","ensg_id":"ENSG00000115255","cell_line_id":"CID001525","localizations":[{"compartment":"er","grade":3}],"interactors":[{"gene":"RTN3","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/target/CID001525","total_profiled":1310},"omim":[{"mim_id":"617304","title":"RETINITIS PIGMENTOSA 77; RP77","url":"https://www.omim.org/entry/617304"},{"mim_id":"609346","title":"RECEPTOR EXPRESSION-ENHANCING PROTEIN 6; REEP6","url":"https://www.omim.org/entry/609346"},{"mim_id":"268000","title":"RETINITIS PIGMENTOSA; RP","url":"https://www.omim.org/entry/268000"},{"mim_id":"162080","title":"NEURAL RETINA LEUCINE ZIPPER; NRL","url":"https://www.omim.org/entry/162080"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Endoplasmic reticulum","reliability":"Supported"},{"location":"Acrosome","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"intestine","ntpm":204.5},{"tissue":"liver","ntpm":523.4},{"tissue":"testis","ntpm":363.6}],"url":"https://www.proteinatlas.org/search/REEP6"},"hgnc":{"alias_symbol":["DP1L1","FLJ25383","Yip2f","TB1"],"prev_symbol":["C19orf32"]},"alphafold":{"accession":"Q96HR9","domains":[{"cath_id":"-","chopping":"2-51","consensus_level":"medium","plddt":82.2656,"start":2,"end":51},{"cath_id":"1.10.287","chopping":"54-125","consensus_level":"medium","plddt":72.9435,"start":54,"end":125}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96HR9","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96HR9-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96HR9-F1-predicted_aligned_error_v6.png","plddt_mean":73.69},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=REEP6","jax_strain_url":"https://www.jax.org/strain/search?query=REEP6"},"sequence":{"accession":"Q96HR9","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96HR9.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96HR9/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96HR9"}},"corpus_meta":[{"pmid":"21946354","id":"PMC_21946354","title":"Identification of a functional transposon insertion in the maize domestication gene tb1.","date":"2011","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/21946354","citation_count":555,"is_preprint":false},{"pmid":"16642024","id":"PMC_16642024","title":"A distant upstream enhancer at the maize domestication gene tb1 has pleiotropic effects on plant and inflorescent architecture.","date":"2006","source":"Nature genetics","url":"https://pubmed.ncbi.nlm.nih.gov/16642024","citation_count":280,"is_preprint":false},{"pmid":"14701910","id":"PMC_14701910","title":"Pattern of diversity in the genomic region near the maize domestication gene tb1.","date":"2003","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/14701910","citation_count":187,"is_preprint":false},{"pmid":"16754863","id":"PMC_16754863","title":"Phylogenetic analysis of the \"ECE\" (CYC/TB1) clade reveals duplications predating the core eudicots.","date":"2006","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/16754863","citation_count":151,"is_preprint":false},{"pmid":"27889058","id":"PMC_27889058","title":"Mutations in REEP6 Cause Autosomal-Recessive Retinitis Pigmentosa.","date":"2016","source":"American journal of human genetics","url":"https://pubmed.ncbi.nlm.nih.gov/27889058","citation_count":104,"is_preprint":false},{"pmid":"22101417","id":"PMC_22101417","title":"Evolution and diversification of the CYC/TB1 gene family in Asteraceae--a comparative study in Gerbera (Mutisieae) and sunflower (Heliantheae).","date":"2011","source":"Molecular biology and evolution","url":"https://pubmed.ncbi.nlm.nih.gov/22101417","citation_count":100,"is_preprint":false},{"pmid":"28475715","id":"PMC_28475715","title":"REEP6 deficiency leads to retinal degeneration through disruption of ER homeostasis and protein trafficking.","date":"2017","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28475715","citation_count":40,"is_preprint":false},{"pmid":"21799845","id":"PMC_21799845","title":"Cereal domestication and evolution of branching: evidence for soft selection in the Tb1 orthologue of pearl millet (Pennisetum glaucum [L.] R. Br.).","date":"2011","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/21799845","citation_count":35,"is_preprint":false},{"pmid":"25557238","id":"PMC_25557238","title":"Analysis of the CYC/TB1 class of TCP transcription factors in basal angiosperms and magnoliids.","date":"2015","source":"The Plant journal : for cell and molecular biology","url":"https://pubmed.ncbi.nlm.nih.gov/25557238","citation_count":33,"is_preprint":false},{"pmid":"28487706","id":"PMC_28487706","title":"Evolution and Expression Patterns of CYC/TB1 Genes in Anacyclus: Phylogenetic Insights for Floral Symmetry Genes in Asteraceae.","date":"2017","source":"Frontiers in plant science","url":"https://pubmed.ncbi.nlm.nih.gov/28487706","citation_count":30,"is_preprint":false},{"pmid":"28369466","id":"PMC_28369466","title":"REEP6 mediates trafficking of a subset of Clathrin-coated vesicles and is critical for rod photoreceptor function and survival.","date":"2017","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/28369466","citation_count":29,"is_preprint":false},{"pmid":"27966653","id":"PMC_27966653","title":"The accessory proteins REEP5 and REEP6 refine CXCR1-mediated cellular responses and lung cancer progression.","date":"2016","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/27966653","citation_count":27,"is_preprint":false},{"pmid":"24691551","id":"PMC_24691551","title":"Regulation of a novel isoform of Receptor Expression Enhancing Protein REEP6 in rod photoreceptors by bZIP transcription factor NRL.","date":"2014","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24691551","citation_count":27,"is_preprint":false},{"pmid":"29949661","id":"PMC_29949661","title":"Evolutionary diversification of CYC/TB1-like TCP homologs and their recruitment for the control of branching and floral morphology in Papaveraceae (basal eudicots).","date":"2018","source":"The New phytologist","url":"https://pubmed.ncbi.nlm.nih.gov/29949661","citation_count":24,"is_preprint":false},{"pmid":"18780751","id":"PMC_18780751","title":"Patterns of molecular evolution associated with two selective sweeps in the Tb1-Dwarf8 region in maize.","date":"2008","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/18780751","citation_count":24,"is_preprint":false},{"pmid":"32915968","id":"PMC_32915968","title":"A CYC/TB1-type TCP transcription factor controls spikelet meristem identity in barley.","date":"2020","source":"Journal of experimental botany","url":"https://pubmed.ncbi.nlm.nih.gov/32915968","citation_count":23,"is_preprint":false},{"pmid":"35150731","id":"PMC_35150731","title":"REEP6 knockout leads to defective β-adrenergic signaling in adipocytes and promotes obesity-related metabolic dysfunction.","date":"2022","source":"Metabolism: clinical and experimental","url":"https://pubmed.ncbi.nlm.nih.gov/35150731","citation_count":22,"is_preprint":false},{"pmid":"24524734","id":"PMC_24524734","title":"The effect of altered dosage of a mutant allele of Teosinte branched 1 (tb1-ref) on the root system of modern maize.","date":"2014","source":"BMC genetics","url":"https://pubmed.ncbi.nlm.nih.gov/24524734","citation_count":22,"is_preprint":false},{"pmid":"2472828","id":"PMC_2472828","title":"Specificity of Mycobacterium tuberculosis phenolic glycolipid (PGL-Tb1) antiserum.","date":"1988","source":"Annales de l'Institut Pasteur. Microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/2472828","citation_count":19,"is_preprint":false},{"pmid":"15728532","id":"PMC_15728532","title":"Deleted in polyposis 1-like 1 gene (Dp1l1): a novel gene richly expressed in retinal ganglion cells.","date":"2005","source":"Investigative ophthalmology & visual science","url":"https://pubmed.ncbi.nlm.nih.gov/15728532","citation_count":14,"is_preprint":false},{"pmid":"33917198","id":"PMC_33917198","title":"Autosomal Recessive Retinitis Pigmentosa Associated with Three Novel REEP6 Variants in Chinese Population.","date":"2021","source":"Genes","url":"https://pubmed.ncbi.nlm.nih.gov/33917198","citation_count":13,"is_preprint":false},{"pmid":"28411454","id":"PMC_28411454","title":"Synthesis and immunogenicity of PG-tb1 monovalent glycoconjugate.","date":"2017","source":"European journal of medicinal chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/28411454","citation_count":13,"is_preprint":false},{"pmid":"37221870","id":"PMC_37221870","title":"Comparison of interferon-gamma production between TB1 and TB2 tubes of QuantiFERON-TB Gold Plus: a meta-analysis.","date":"2023","source":"Clinical chemistry and laboratory medicine","url":"https://pubmed.ncbi.nlm.nih.gov/37221870","citation_count":11,"is_preprint":false},{"pmid":"34104971","id":"PMC_34104971","title":"Transcript isoforms of Reep6 have distinct functions in the retina.","date":"2021","source":"Human molecular genetics","url":"https://pubmed.ncbi.nlm.nih.gov/34104971","citation_count":10,"is_preprint":false},{"pmid":"32761247","id":"PMC_32761247","title":"TB1: from domestication gene to tool for many trades.","date":"2020","source":"Journal of experimental botany","url":"https://pubmed.ncbi.nlm.nih.gov/32761247","citation_count":10,"is_preprint":false},{"pmid":"30514508","id":"PMC_30514508","title":"Characterization of specific CD4 and CD8 T-cell responses in QuantiFERON TB Gold-Plus TB1 and TB2 tubes.","date":"2018","source":"Tuberculosis (Edinburgh, Scotland)","url":"https://pubmed.ncbi.nlm.nih.gov/30514508","citation_count":10,"is_preprint":false},{"pmid":"25909039","id":"PMC_25909039","title":"Natural variation in teosinte at the domestication locus teosinte branched1 (tb1).","date":"2015","source":"PeerJ","url":"https://pubmed.ncbi.nlm.nih.gov/25909039","citation_count":10,"is_preprint":false},{"pmid":"24797271","id":"PMC_24797271","title":"A toolbox for tuberculosis (TB) diagnosis: an Indian multi-centric study (2006-2008); evaluation of serological assays based on PGL-Tb1 and ESAT-6/CFP10 antigens for TB diagnosis.","date":"2014","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/24797271","citation_count":10,"is_preprint":false},{"pmid":"31538292","id":"PMC_31538292","title":"Novel REEP6 gene mutation associated with autosomal recessive retinitis pigmentosa.","date":"2019","source":"Documenta ophthalmologica. Advances in ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/31538292","citation_count":9,"is_preprint":false},{"pmid":"30081253","id":"PMC_30081253","title":"Molecular cloning and sequence variance analysis of the TEOSINTE BRANCHED1 (TB1) gene in bermudagrass [Cynodon dactylon (L.) Pers].","date":"2018","source":"Journal of plant physiology","url":"https://pubmed.ncbi.nlm.nih.gov/30081253","citation_count":9,"is_preprint":false},{"pmid":"36520844","id":"PMC_36520844","title":"The 'Candidatus Phytoplasma mali' effector protein SAP11CaPm interacts with MdTCP16, a class II CYC/TB1 transcription factor that is highly expressed during phytoplasma infection.","date":"2022","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/36520844","citation_count":9,"is_preprint":false},{"pmid":"19924442","id":"PMC_19924442","title":"Polymorphisms of the apoptosis-associated gene DP1L1 (deleted in polyposis 1-like 1) in colon cancer and inflammatory bowel disease.","date":"2009","source":"Journal of cancer research and clinical oncology","url":"https://pubmed.ncbi.nlm.nih.gov/19924442","citation_count":7,"is_preprint":false},{"pmid":"36484138","id":"PMC_36484138","title":"Differential chromatin binding preference is the result of the neo-functionalization of the TB1 clade of TCP transcription factors in grasses.","date":"2023","source":"The New phytologist","url":"https://pubmed.ncbi.nlm.nih.gov/36484138","citation_count":7,"is_preprint":false},{"pmid":"29120066","id":"PMC_29120066","title":"A novel nonsense variant in REEP6 is involved in a sporadic rod-cone dystrophy case.","date":"2018","source":"Clinical genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29120066","citation_count":7,"is_preprint":false},{"pmid":"36064821","id":"PMC_36064821","title":"MiR-672-5p-Mediated Upregulation of REEP6 in Spinal Dorsal Horn Participates in Bortezomib-Induced Neuropathic Pain in Rats.","date":"2022","source":"Neurochemical research","url":"https://pubmed.ncbi.nlm.nih.gov/36064821","citation_count":5,"is_preprint":false},{"pmid":"17545127","id":"PMC_17545127","title":"Molecular cloning, expression analyses and primary evolution studies of REV- and TB1-like genes in bamboo.","date":"2007","source":"Tree physiology","url":"https://pubmed.ncbi.nlm.nih.gov/17545127","citation_count":5,"is_preprint":false},{"pmid":"8857189","id":"PMC_8857189","title":"Optimization study of Escherichia coli TB1 cell disruption for cytochrome b5 recovery in a small-scale bead mill.","date":"1996","source":"Biotechnology progress","url":"https://pubmed.ncbi.nlm.nih.gov/8857189","citation_count":5,"is_preprint":false},{"pmid":"33343594","id":"PMC_33343594","title":"Expression and Function Studies of CYC/TB1-Like Genes in the Asymmetric Flower Canna (Cannaceae, Zingiberales).","date":"2020","source":"Frontiers in plant science","url":"https://pubmed.ncbi.nlm.nih.gov/33343594","citation_count":3,"is_preprint":false},{"pmid":"31329463","id":"PMC_31329463","title":"Identification and Genomic Analysis of a Pathogenic Strain of Mycoplasma hyopneumoniae (TB1) Isolated from Tibetan Pigs.","date":"2019","source":"DNA and cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/31329463","citation_count":3,"is_preprint":false},{"pmid":"30740572","id":"PMC_30740572","title":"Generation and classification of transcriptomes in two Croomia species and molecular evolution of CYC/TB1 genes in Stemonaceae.","date":"2018","source":"Plant diversity","url":"https://pubmed.ncbi.nlm.nih.gov/30740572","citation_count":2,"is_preprint":false},{"pmid":"26973784","id":"PMC_26973784","title":"Effect of the synthesis of rice non-symbiotic hemoglobins 1 and 2 in the recombinant Escherichia coli TB1 growth.","date":"2015","source":"F1000Research","url":"https://pubmed.ncbi.nlm.nih.gov/26973784","citation_count":2,"is_preprint":false},{"pmid":"32482923","id":"PMC_32482923","title":"Identification and expression profiling of HvMADS57 and HvD14 in a barley tb1 mutant.","date":"2020","source":"Journal of genetics","url":"https://pubmed.ncbi.nlm.nih.gov/32482923","citation_count":1,"is_preprint":false},{"pmid":"17472373","id":"PMC_17472373","title":"Influence of oxygen defects on the crystal structure and magnetic properties of the (Tb1-xNax)MnO3-y (0<or=x<or=0.3) system.","date":"2007","source":"Inorganic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/17472373","citation_count":1,"is_preprint":false},{"pmid":"8818263","id":"PMC_8818263","title":"Freeze/thawing and sonication of Escherichia coli TB1 cells for cytochrome b5 recovery.","date":"1996","source":"Bioseparation","url":"https://pubmed.ncbi.nlm.nih.gov/8818263","citation_count":1,"is_preprint":false},{"pmid":"42151833","id":"PMC_42151833","title":"The expression significance and non-invasive detection of REEP6 and REEP5 in prostate cancer.","date":"2026","source":"BMC cancer","url":"https://pubmed.ncbi.nlm.nih.gov/42151833","citation_count":0,"is_preprint":false},{"pmid":"41553438","id":"PMC_41553438","title":"Clinical and genetic characterization of REEP6-associated retinopathy in a Japanese cohort.","date":"2026","source":"Japanese journal of ophthalmology","url":"https://pubmed.ncbi.nlm.nih.gov/41553438","citation_count":0,"is_preprint":false},{"pmid":"41796262","id":"PMC_41796262","title":"WTAP mediated m6A methylation modulates retinal photoreceptor function via facilitating of REEP6, PDE6B and RDH12 translation.","date":"2026","source":"Science China. Life sciences","url":"https://pubmed.ncbi.nlm.nih.gov/41796262","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.03.02.641069","title":"REEP6 deficiency impairs ER and Golgi morphologies and causes retinal degeneration by attenuating the expression of phototransduction proteins","date":"2025-03-10","source":"bioRxiv","url":"https://doi.org/10.1101/2025.03.02.641069","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":25707,"output_tokens":3361,"usd":0.063768,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":10829,"output_tokens":3681,"usd":0.073085,"stage2_stop_reason":"end_turn"},"total_usd":0.136853,"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\": 2014,\n      \"finding\": \"REEP6 expression in rod photoreceptors is regulated by the bZIP transcription factor NRL, which binds within Reep6 intron 1 to drive expression of the rod-specific isoform REEP6.1 through an intronic enhancer sequence. Chromatin immunoprecipitation identified NRL binding at this site, and reporter assays in cultured cells and retinal explants confirmed NRL-directed REEP6.1 expression.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), reporter assay, retinal explant transfection, 5'-RACE, exon-specific Taqman assay\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal ChIP plus reporter assay in two systems (cultured cells and retinal explants), single lab but multiple orthogonal methods\",\n      \"pmids\": [\"24691551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Knockdown of Reep6 in mouse and zebrafish resulted in death of retinal cells, establishing a required role for REEP6 in retinal cell survival.\",\n      \"method\": \"siRNA knockdown in mouse retina; morpholino knockdown in zebrafish\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function with defined cellular phenotype (cell death) in two model organisms, single lab\",\n      \"pmids\": [\"24691551\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"REEP6 is a member of the REEP/Yop1 family of ER-shaping proteins and is expressed in the retina as a retina-specific isoform (REEP6.1). Missense variants p.Pro128Leu and p.Leu135Pro and a REEP6.1-specific frameshift mutant expressed in cultured cells destabilize the protein. A knock-in mouse (p.Leu135Pro) shows progressive rod photoreceptor degeneration and dysfunction.\",\n      \"method\": \"Human 3D organoid optic cups; CRISPR-Cas9 knock-in mouse; overexpression in cultured cells; electroretinography; histology\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (organoids, knock-in mouse, cell expression assays, ERG), replicated across families and models\",\n      \"pmids\": [\"27889058\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In rod photoreceptors, REEP6 localizes to the inner segment and outer plexiform layer. REEP6 knockout mice show expansion of the distal ER and increased mitochondria number in rods, severely reduced expression of retinal guanylate cyclases GC1 and GC2 (near-undetectable), and ER stress markers (elevated CHOP and activated caspase-12), implicating REEP6 in maintaining cGMP homeostasis through facilitating the stability/trafficking of guanylate cyclases and ER/mitochondrial homeostasis. Rhodopsin, Rom1, and peripherin/rds trafficking were unaffected.\",\n      \"method\": \"CRISPR/Cas9 knockout mouse; transmission electron microscopy; 3View serial block-face scanning EM; immunofluorescence localization; electroretinography; Western blot for GC1, GC2, CHOP, caspase-12\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR KO mouse with multiple orthogonal structural and biochemical readouts, defined cellular mechanism, single lab but rigorous\",\n      \"pmids\": [\"28475715\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"REEP6 is detected in a subset of Clathrin-coated vesicles in rod photoreceptors and interacts with the t-SNARE Syntaxin3. Loss of REEP6 causes aberrant accumulation of vacuole-like structures at the apical inner segment and reduction in selected rod phototransduction proteins.\",\n      \"method\": \"Co-immunoprecipitation; immunofluorescence colocalization with Clathrin; Reep6 knockout mouse; electroretinography\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP for Syntaxin3 interaction plus KO phenotype, single lab, two orthogonal methods\",\n      \"pmids\": [\"28369466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"REEP6 interacts with CXCR1 (but not CXCR2) and, together with REEP5, facilitates ligand-stimulated endocytosis of CXCR1 and intracellular clustering of β-arrestin2. Depletion of REEP5/REEP6 impairs receptor internalization and reduces IL-8-stimulated ERK phosphorylation and actin polymerization without affecting CXCR1 plasma membrane expression.\",\n      \"method\": \"Co-immunoprecipitation; siRNA knockdown; overexpression; β-arrestin2 clustering assay; ERK phosphorylation Western blot; in vivo xenograft model\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — Co-IP plus functional knockdown with multiple readouts, single lab\",\n      \"pmids\": [\"27966653\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The retina-specific isoform Reep6.1 (containing exon 5-encoded 27 aa) has rod-specific functions that cannot be substituted by the canonical isoform Reep6.2. Exon-5-specific knockout (Reep6E5/E5) produces rod degeneration comparable to full Reep6 knockout, and overexpression of Reep6.2 fails to rescue this phenotype whereas overexpression of Reep6.1 does rescue it.\",\n      \"method\": \"Isoform-specific knockout mouse (exon 5 deletion); AAV-mediated overexpression rescue experiment; electroretinography; histology\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — isoform-specific KO plus rescue experiment with both isoforms, multiple orthogonal readouts, single lab\",\n      \"pmids\": [\"34104971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"REEP6 plays a cell-autonomous role in β-adrenergic signal transduction in adipocytes by facilitating the trafficking of adenylate cyclase 3 (ADCY3) to the plasma membrane. REEP6 KO reduces ADCY3 plasma membrane targeting, severely reduces protein kinase A-mediated signaling in brown adipose tissue, and reduces mitochondrial mass. These defects were reproduced in cultured adipocytes, confirming cell autonomy.\",\n      \"method\": \"REEP6 knockout mouse; high-fat diet model; siRNA knockdown in C3H10T1/2 adipocytes and primary adipocytes; indirect calorimetry; confocal and electron microscopy; Western blot; mitochondrial DNA analysis; plasma membrane fractionation for ADCY3\",\n      \"journal\": \"Metabolism: clinical and experimental\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse plus cell-autonomous knockdown, plasma membrane fractionation for ADCY3, multiple orthogonal metabolic readouts, single lab\",\n      \"pmids\": [\"35150731\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"miR-672-5p directly regulates REEP6 expression in spinal dorsal horn neurons (validated by dual-luciferase reporter assay targeting the REEP6 mRNA 3'UTR). Upregulation of REEP6 in dorsal horn neurons contributes to neuronal hyperexcitability and mechanical allodynia in bortezomib-induced neuropathic pain.\",\n      \"method\": \"miRNA microarray; PCR; dual-luciferase reporter assay; intrathecal injection of miR-672-5p agomir/antagomir; sEPSC recording; REEP6 overexpression/knockdown in vivo\",\n      \"journal\": \"Neurochemical research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — luciferase reporter plus in vivo functional experiments, single lab\",\n      \"pmids\": [\"36064821\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The REEP6 ortholog Dp1l1 (TB2-like 1) localizes to the cytoplasm in a punctate pattern in retinal ganglion cells, consistent with a role in intracellular membrane trafficking, as determined by immunohistochemistry and intracellular localization analyses.\",\n      \"method\": \"In situ hybridization; immunohistochemistry; intracellular localization analysis; radiation hybrid mapping\",\n      \"journal\": \"Investigative ophthalmology & visual science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization experiment in two assays, foundational characterization of the ortholog, single lab\",\n      \"pmids\": [\"15728532\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"WTAP-mediated m6A methylation facilitates translation of REEP6 (and PDE6B, RDH12) in rod photoreceptors by depositing m6A modifications in the 3'UTR of Reep6 mRNA. Loss of Wtap abolished WTAP-mediated methyltransferase complex stability, reduced m6A levels genome-wide, and caused epigenetic silencing of Reep6 with consequent rod degeneration; AAV-mediated reintroduction of WTAP partially restored REEP6 expression and mitigated degeneration.\",\n      \"method\": \"Conditional Wtap knockout mouse; m6A-seq; Western blot; AAV gene therapy rescue; ERG\",\n      \"journal\": \"Science China. Life sciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mouse with m6A-seq and rescue experiment, single lab, multiple readouts\",\n      \"pmids\": [\"41796262\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"In vitro expression of REEP6 alters ER marker expression and Golgi morphology. In an independent Reep6 knockout mouse, guanylate cyclases are not absent but are reduced ~one-third, rhodopsin and GRK1 are also reduced, PDE6 trafficking is normal (contrasting a prior report), and RNA-seq shows reduced phototransduction gene transcription and activated inflammation pathways, suggesting that REEP6 maintains ER and Golgi function required for expression of membrane phototransduction proteins.\",\n      \"method\": \"CRISPR/Cas9 Reep6 knockout mouse; in vitro REEP6 overexpression with ER/Golgi marker imaging; Western blot; RNA-seq; electroretinography\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — independent KO model plus in vitro ER/Golgi morphology assay and RNA-seq, preprint not peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.03.02.641069\"],\n      \"is_preprint\": true\n    }\n  ],\n  \"current_model\": \"REEP6 is a transmembrane ER-shaping protein of the REEP/Yop1 family whose rod-specific isoform (REEP6.1), transcriptionally activated by the NRL transcription factor via an intronic enhancer and translationally promoted by WTAP-mediated m6A modification, localizes to the inner segment of rod photoreceptors where it maintains ER and Golgi homeostasis, facilitates the stability/trafficking of guanylate cyclases (GC1/GC2) and adenylate cyclase 3, participates in Clathrin-coated vesicle trafficking through interaction with Syntaxin3, and supports CXCR1-mediated endocytosis in non-retinal cells; loss of REEP6 causes ER stress, reduced expression of membrane phototransduction proteins, and progressive rod photoreceptor degeneration.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"REEP6 is a transmembrane member of the REEP/Yop1 family of ER-shaping proteins that maintains endoplasmic reticulum and Golgi homeostasis required for the stability and trafficking of membrane signaling enzymes, and is essential for rod photoreceptor survival [#2, #3]. In the retina, expression is driven by the rod transcription factor NRL, which binds an enhancer within Reep6 intron 1 to activate the rod-specific isoform REEP6.1 [#0]; this isoform carries an exon-5-encoded 27-residue segment whose function cannot be substituted by the canonical REEP6.2 isoform, as exon-5-specific knockout phenocopies full knockout and only REEP6.1 rescues the resulting degeneration [#6]. Within rods, REEP6 localizes to the inner segment, and its loss expands the distal ER, increases mitochondrial number, triggers ER stress (CHOP, caspase-12), and reduces the guanylate cyclases GC1/GC2 along with other membrane phototransduction proteins, linking REEP6 to cGMP homeostasis and rod viability [#3, #11]. REEP6 participates in vesicular trafficking, residing in a subset of clathrin-coated vesicles and interacting with the t-SNARE Syntaxin3 [#4]. Beyond the retina, REEP6 facilitates plasma-membrane trafficking of signaling effectors more broadly: it promotes adenylate cyclase 3 (ADCY3) delivery to support \\u03b2-adrenergic/PKA signaling in adipocytes [#7] and supports CXCR1-mediated endocytosis and \\u03b2-arrestin2 clustering [#5]. Destabilizing missense and frameshift variants cause progressive rod photoreceptor degeneration in patients and a knock-in mouse model [#2].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Established the first cellular context for the REEP6 ortholog, placing it in intracellular membrane trafficking before its retinal role was known.\",\n      \"evidence\": \"In situ hybridization, immunohistochemistry and intracellular localization of the ortholog Dp1l1 in retinal ganglion cells\",\n      \"pmids\": [\"15728532\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular partners or trafficking step defined\", \"Ortholog rather than human REEP6 directly characterized\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined how rod-restricted REEP6 expression is achieved and showed it is required for retinal cell survival, connecting a transcriptional program to a functional necessity.\",\n      \"evidence\": \"ChIP and reporter assays identifying NRL binding in Reep6 intron 1; siRNA/morpholino knockdown in mouse and zebrafish\",\n      \"pmids\": [\"24691551\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Knockdown phenotype does not reveal the molecular function of REEP6\", \"Mechanism of cell death not resolved\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Linked REEP6 to human retinal disease and to the ER-shaping REEP/Yop1 family, showing pathogenic variants destabilize the protein and cause rod degeneration.\",\n      \"evidence\": \"Patient missense/frameshift variants expressed in cells, human organoid optic cups, and a p.Leu135Pro knock-in mouse with ERG/histology\",\n      \"pmids\": [\"27889058\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the trafficking substrates or partners affected\", \"ER-shaping activity inferred from family membership, not directly assayed\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrated a non-retinal trafficking role, implicating REEP6 in receptor endocytosis and downstream signaling.\",\n      \"evidence\": \"Co-IP, siRNA depletion of REEP5/REEP6, \\u03b2-arrestin2 clustering, ERK phosphorylation and xenograft assays for CXCR1\",\n      \"pmids\": [\"27966653\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab Co-IP without reciprocal structural validation\", \"Mechanism by which REEP6 promotes internalization not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established a concrete molecular mechanism in rods: REEP6 maintains ER/mitochondrial homeostasis and is required for guanylate cyclase stability and cGMP homeostasis.\",\n      \"evidence\": \"CRISPR knockout mouse with EM, immunofluorescence, ERG, and Western blots for GC1/GC2, CHOP, caspase-12\",\n      \"pmids\": [\"28475715\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether REEP6 directly chaperones GCs or acts indirectly via ER stress unresolved\", \"Discrepancy with later reports on degree of GC loss\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Placed REEP6 in clathrin-coated vesicle trafficking and identified a SNARE partner, suggesting a vesicular route for delivery of phototransduction proteins.\",\n      \"evidence\": \"Co-IP with Syntaxin3, clathrin colocalization, and knockout mouse phenotyping\",\n      \"pmids\": [\"28369466\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single Co-IP for Syntaxin3 without reciprocal validation\", \"Functional consequence of the Syntaxin3 interaction not directly tested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showed the rod-specific isoform REEP6.1 carries the essential activity, defining isoform specialization as functionally non-redundant.\",\n      \"evidence\": \"Exon-5-specific knockout mouse and AAV rescue with REEP6.1 versus REEP6.2\",\n      \"pmids\": [\"34104971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular property conferred by the exon-5 segment not defined\", \"Why REEP6.2 cannot substitute remains mechanistically unexplained\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Generalized REEP6's trafficking role to a second effector and tissue, showing it delivers ADCY3 to the plasma membrane for \\u03b2-adrenergic signaling.\",\n      \"evidence\": \"Knockout mouse and adipocyte knockdown with plasma membrane fractionation for ADCY3 and metabolic/PKA readouts\",\n      \"pmids\": [\"35150731\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct physical interaction between REEP6 and ADCY3 not shown\", \"Whether the same mechanism operates in rods for GCs not established\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified an upstream post-transcriptional regulator of REEP6 in a neuronal pain context, broadening its regulatory landscape.\",\n      \"evidence\": \"miR-672-5p luciferase reporter targeting the REEP6 3'UTR plus in vivo agomir/antagomir and electrophysiology\",\n      \"pmids\": [\"36064821\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic role of REEP6 in neuronal excitability not defined\", \"Relevance to retinal/adipocyte functions unclear\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Connected an epitranscriptomic mechanism to REEP6 dosage, showing WTAP-mediated m6A in the 3'UTR promotes REEP6 translation and that its loss causes rod degeneration.\",\n      \"evidence\": \"Conditional Wtap knockout mouse, m6A-seq, Western blot, and AAV rescue with ERG\",\n      \"pmids\": [\"41796262\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct effect on REEP6 separated from co-regulated PDE6B/RDH12 not isolated\", \"Single lab, partial rescue only\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Independent knockout reframed the ER/Golgi-maintenance model, showing reduced (not absent) guanylate cyclases and broadly reduced phototransduction transcription with inflammation activation.\",\n      \"evidence\": \"Independent CRISPR knockout mouse, in vitro ER/Golgi marker imaging, RNA-seq and ERG (preprint)\",\n      \"pmids\": [\"bio_10.1101_2025.03.02.641069\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not peer-reviewed\", \"Conflicts with prior report on GC absence and PDE6 trafficking\", \"Direct cause of transcriptional downregulation unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Whether REEP6 directly binds the membrane proteins whose trafficking it supports (GCs, ADCY3, rhodopsin/GRK1) or acts indirectly by shaping ER/Golgi and vesicle compartments remains the central open mechanistic question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of REEP6 or its complexes\", \"No demonstrated direct cargo interaction\", \"ER-shaping activity not biochemically reconstituted\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [4, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2, 3, 11]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [11]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-5653656\", \"supporting_discovery_ids\": [4, 7]},\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [3, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [5, 7]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"STX3\", \"CXCR1\", \"REEP5\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}