{"gene":"TTLL5","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2006,"finding":"STAMP (TTLL5) was identified as a novel coregulator protein that associates with p160 coactivators TIF2 and SRC-1 and is selective for a subset of steroid/nuclear receptors including glucocorticoid receptors (GRs). Transfected STAMP increases TIF2 effects in GR-mediated repression and induction; siRNA knockdown of endogenous STAMP reduces both induction and repression of endogenous GR-regulated genes. Endogenous STAMP colocalizes with GR in intact cells and is recruited to promoters of GR-induced and -repressed genes.","method":"Co-immunoprecipitation, siRNA knockdown of endogenous STAMP, chromatin immunoprecipitation (ChIP) on endogenous gene promoters, colocalization by fluorescence microscopy","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal binding shown, ChIP at endogenous promoters, siRNA knockdown of endogenous gene with defined transcriptional phenotype, multiple orthogonal methods in one study","pmids":["17116691"],"is_preprint":false},{"year":2012,"finding":"STAMP (TTLL5) forms a ternary complex with glucocorticoid receptor (GR) and coactivator TIF2. Different protein domains of GR, TIF2, and STAMP independently modulate the maximal activity (A_max), agonist potency (EC50), and partial agonist activity (PAA) of GR-mediated gene induction, demonstrating that these three parameters of transcriptional regulation can be independently controlled by distinct molecular interactions within the complex.","method":"Transfection of differentially sized protein fragments, reporter gene assays for A_max/EC50/PAA, endogenous gene assays","journal":"Molecular and cellular endocrinology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple fragment combinations tested with functional readouts, single lab, builds on prior STAMP characterization","pmids":["22342989"],"is_preprint":false},{"year":2010,"finding":"STAMP (TTLL5) overexpression reduces the growth rate of HEK293 cells in a steroid-independent manner. siRNA knockdown of STAMP alters proliferation of ovarian cancer cell lines in a cell-line-specific manner, indicating a physiological role for STAMP in modulating cell growth rates independent of steroid hormone signaling.","method":"Stable transfection of STAMP in HEK293 cells (growth rate measurement), siRNA knockdown in multiple ovarian cancer cell lines (proliferation assay)","journal":"BMC cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function (siRNA) and gain-of-function (stable overexpression) with defined proliferation phenotype; single lab, multiple cell lines tested","pmids":["20374646"],"is_preprint":false},{"year":2013,"finding":"Disruption of the Ttll5/STAMP gene in male mice causes substantial reduction in α-tubulin polyglutamylation specifically in sperm tails, leading to abnormal axonemal structures with loss of tubulin doublets, defective progressive sperm motility, and male infertility. The defect in tubulin polyglutamylation was closely correlated with reduction in mutant STAMP mRNA levels. Axonemes in other tissues appeared unaffected, indicating a unique, tissue-selective TTLL5-mediated pathway for α-tubulin polyglutamylation required for sperm maturation.","method":"Targeted mouse knockout/internal deletion of Stamp gene; electron microscopy of sperm axonemes; biochemical measurement of α-tubulin polyglutamylation; sperm motility assays; RT-qPCR of TTLL genes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo knockout mouse model with electron microscopy, biochemical quantification of polyglutamylation, and motility phenotype; multiple orthogonal methods in one study","pmids":["23558686"],"is_preprint":false},{"year":2016,"finding":"TTLL5 directly glutamylates RPGR(ORF15) — a photoreceptor-specific isoform of the X-linked retinitis pigmentosa GTPase regulator — in its Glu-Gly-rich repetitive region containing motifs homologous to the α-tubulin C-terminal tail. The C-terminal basic domain of RPGR(ORF15) binds to a noncatalytic cofactor interaction domain unique to TTLL5 among TTLL family glutamylases, targeting TTLL5 specifically to RPGR. Only TTLL5, and not other TTLL family glutamylases, interacts with RPGR(ORF15) in cells. A Ttll5 mutant mouse shows complete loss of RPGR glutamylation without marked changes in tubulin glutamylation, and develops photoreceptor degeneration with early mislocalization of cone opsins resembling Rpgr-null mice. TTLL5 disease mutants causing human retinal dystrophy show impaired glutamylation of RPGR(ORF15).","method":"In vitro glutamylation assay; co-immunoprecipitation of TTLL5 and RPGR(ORF15); domain mapping (C-terminal basic domain of RPGR, cofactor interaction domain of TTLL5); Ttll5 mutant mouse biochemical analysis (anti-glutamylation immunoblot/immunofluorescence); retinal phenotyping (cone opsin localization, histology); functional analysis of disease-associated TTLL5 mutants","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro enzymatic assay, domain mapping, Co-IP, in vivo mouse model with biochemical and phenotypic validation, disease mutant functional testing; multiple orthogonal methods establishing substrate specificity and disease mechanism","pmids":["27162334"],"is_preprint":false},{"year":2014,"finding":"Biallelic loss-of-function variants in TTLL5 (encoding a tubulin glutamylase) cause cone, cone-rod, and macular dystrophies in humans. In human and murine retinae, TTLL5 localizes to the centrioles at the base of the connecting cilium of photoreceptors, consistent with a role in polyglutamylation of primary cilia.","method":"Exome sequencing and gene-based case-control association in retinal dystrophy patients; immunolocalization of TTLL5 in human and murine retinal sections","journal":"American journal of human genetics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct subcellular localization by immunofluorescence tied to disease context; genetic loss-of-function in humans; single study but with consistent findings across multiple families","pmids":["24791901"],"is_preprint":false},{"year":2016,"finding":"Mutations in TTLL5 in humans cause cone-rod degeneration and are associated with reduced male fertility in patients carrying truncating variants. TTLL5 protein localizes to the basal body of photoreceptor cells in rat retina and to the centrosome of the spermatozoon flagellum in humans, suggesting a common polyglutamylation mechanism in both cell types.","method":"Next-generation sequencing and autozygome-based screening; immunofluorescence localization of TTLL5 in rat retina and human sperm; sperm motility analysis in affected patients","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — direct protein localization in two tissue types, human genetic loss-of-function with correlated fertility phenotype; single lab","pmids":["28173158"],"is_preprint":false}],"current_model":"TTLL5 (also known as STAMP/KIAA0998) is a tubulin tyrosine ligase-like polyglutamylase that has two established mechanistic roles: (1) it directly glutamylates RPGR(ORF15) at its Glu-Gly-rich domain via a unique noncatalytic cofactor interaction domain, with this modification being essential for photoreceptor function such that loss of TTLL5 causes cone photoreceptor degeneration; and (2) it mediates tissue-selective α-tubulin polyglutamylation in sperm flagella required for normal axonemal structure and male fertility. Additionally, TTLL5/STAMP functions as a transcriptional comodulator that forms a ternary complex with glucocorticoid receptor and p160 coactivators (TIF2/SRC-1), independently modulating maximal induction, agonist potency, and partial agonist activity of GR-regulated genes, and can also reduce cell proliferation in a steroid-independent manner."},"narrative":{"mechanistic_narrative":"TTLL5 (STAMP/KIAA0998) is a tubulin tyrosine ligase-like polyglutamylase that installs glutamate side chains on specific substrates to control ciliary and flagellar function [PMID:23558686, PMID:27162334]. Its best-defined catalytic role is the direct glutamylation of RPGR(ORF15), the photoreceptor-specific isoform of the retinitis pigmentosa GTPase regulator, within its α-tubulin-like Glu-Gly-rich repeat region; this substrate selectivity is conferred by a noncatalytic cofactor interaction domain unique to TTLL5 that engages the C-terminal basic domain of RPGR(ORF15), so that among TTLL family enzymes only TTLL5 modifies RPGR [PMID:27162334]. Loss of TTLL5 abolishes RPGR glutamylation and causes cone opsin mislocalization and photoreceptor degeneration, and biallelic loss-of-function variants in humans cause cone, cone-rod, and macular dystrophies, with TTLL5 localizing to the centrioles/basal body at the base of the photoreceptor connecting cilium [PMID:27162334, PMID:24791901]. In parallel, TTLL5 mediates a tissue-selective α-tubulin polyglutamylation of the sperm flagellar axoneme; its disruption in mice reduces sperm-tail tubulin polyglutamylation, disrupts axonemal doublet structure and motility, and causes male infertility, with the protein localizing to the spermatozoon flagellar centrosome [PMID:23558686, PMID:28173158]. Independently of this catalytic activity, TTLL5/STAMP acts as a transcriptional comodulator that associates with the p160 coactivators TIF2 and SRC-1, colocalizes with and is recruited to promoters of glucocorticoid receptor-regulated genes, and forms a ternary complex with GR and TIF2 in which distinct domains independently tune maximal induction, agonist potency, and partial agonist activity [PMID:17116691, PMID:22342989]; it also reduces cell proliferation in a steroid-independent manner [PMID:20374646].","teleology":[{"year":2006,"claim":"Established TTLL5/STAMP's first known function as a steroid receptor coregulator, answering whether it participates in transcriptional control by linking it to p160 coactivators and GR-regulated genes.","evidence":"Co-IP, siRNA knockdown of endogenous STAMP, and ChIP at endogenous GR-regulated promoters with colocalization microscopy","pmids":["17116691"],"confidence":"High","gaps":["Did not address any enzymatic/polyglutamylase activity","Mechanism of how STAMP alters coactivator function not resolved"]},{"year":2010,"claim":"Showed STAMP modulates cell growth independent of steroid signaling, indicating a physiological role beyond hormone-regulated transcription.","evidence":"Stable overexpression in HEK293 and siRNA knockdown across multiple ovarian cancer cell lines with proliferation readouts","pmids":["20374646"],"confidence":"Medium","gaps":["Molecular basis of the growth effect unidentified","Cell-line-specific responses unexplained"]},{"year":2012,"claim":"Dissected how STAMP shapes GR transcriptional output, showing distinct domain interactions independently set maximal activity, potency, and partial agonist activity.","evidence":"Protein fragment transfections with reporter and endogenous gene assays measuring A_max/EC50/PAA in a GR-TIF2-STAMP ternary complex","pmids":["22342989"],"confidence":"Medium","gaps":["Structural basis of the ternary complex not determined","Single lab; no orthogonal confirmation of independent parameter control"]},{"year":2013,"claim":"Defined the first catalytic in vivo role by showing TTLL5 drives tissue-selective sperm-tail α-tubulin polyglutamylation required for axonemal integrity and male fertility.","evidence":"Targeted mouse Stamp deletion with sperm axoneme EM, biochemical polyglutamylation quantification, and motility assays","pmids":["23558686"],"confidence":"High","gaps":["Mechanism of tissue selectivity unexplained","Did not identify how polyglutamylation stabilizes doublets"]},{"year":2014,"claim":"Connected human retinal dystrophy to TTLL5 loss and placed the protein at the photoreceptor connecting cilium base, implicating ciliary polyglutamylation.","evidence":"Exome sequencing/case-control in retinal dystrophy patients with TTLL5 immunolocalization in human and murine retina","pmids":["24791901"],"confidence":"Medium","gaps":["Direct substrate in photoreceptors not yet identified","Causal mechanism linking variants to degeneration not established"]},{"year":2016,"claim":"Identified RPGR(ORF15) as a direct, TTLL5-specific glutamylation substrate and defined the unique cofactor interaction domain underlying substrate targeting and disease.","evidence":"In vitro glutamylation assays, Co-IP, domain mapping, Ttll5 mutant mouse biochemistry/retinal phenotyping, and functional testing of human disease mutants","pmids":["27162334"],"confidence":"High","gaps":["Stoichiometry/site mapping of RPGR glutamylation not resolved","How RPGR glutamylation supports opsin trafficking unknown"]},{"year":2016,"claim":"Unified the retinal and reproductive phenotypes by showing TTLL5 localizes to both the photoreceptor basal body and the sperm flagellar centrosome, with truncating variants associated with reduced fertility.","evidence":"NGS/autozygome screening with TTLL5 immunofluorescence in rat retina and human sperm plus patient motility analysis","pmids":["28173158"],"confidence":"Medium","gaps":["Single lab localization","Did not biochemically confirm shared substrate across the two tissues"]},{"year":null,"claim":"How TTLL5's catalytic polyglutamylase activity and its noncatalytic role as a GR/p160 transcriptional comodulator are mechanistically and physiologically integrated remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model of the cofactor interaction domain or the GR-TIF2-STAMP complex","Whether the proliferation and transcriptional roles depend on enzymatic activity is untested","No reconstituted polyglutamylation showing chain length/site preference"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0016740","term_label":"transferase activity","supporting_discovery_ids":[3,4]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[0,1]}],"localization":[{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[5,6]},{"term_id":"GO:0005929","term_label":"cilium","supporting_discovery_ids":[5]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0]}],"pathway":[{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[0,1]},{"term_id":"R-HSA-9709957","term_label":"Sensory Perception","supporting_discovery_ids":[4,5]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[3]}],"complexes":["GR-TIF2-STAMP ternary complex"],"partners":["RPGR","TIF2","SRC-1","NR3C1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q6EMB2","full_name":"Tubulin polyglutamylase TTLL5","aliases":["SRC1 and TIF2-associated modulatory protein","STAMP protein","Tubulin--tyrosine ligase-like protein 5"],"length_aa":1281,"mass_kda":143.6,"function":"Polyglutamylase which modifies tubulin, generating polyglutamate side chains on the gamma-carboxyl group of specific glutamate residues within the C-terminal tail of tubulin. Preferentially mediates ATP-dependent initiation step of the polyglutamylation reaction over the elongation step. Preferentially modifies the alpha-tubulin tail over a beta-tail (By similarity). Required for CCSAP localization to both polyglutamylated spindle and cilia microtubules (PubMed:22493317). Increases the effects of transcriptional coactivator NCOA2/TIF2 in glucocorticoid receptor-mediated repression and induction and in androgen receptor-mediated induction (PubMed:17116691)","subcellular_location":"Cell projection, cilium; Cytoplasm, cytoskeleton, cilium basal body; Nucleus; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q6EMB2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TTLL5","classification":"Not Classified","n_dependent_lines":25,"n_total_lines":1208,"dependency_fraction":0.020695364238410598},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"MVD","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TTLL5","total_profiled":1310},"omim":[{"mim_id":"620485","title":"TUBULIN TYROSINE LIGASE-LIKE 13; TTLL13","url":"https://www.omim.org/entry/620485"},{"mim_id":"618813","title":"TUBULIN TYROSINE LIGASE-LIKE 7; TTLL7","url":"https://www.omim.org/entry/618813"},{"mim_id":"617871","title":"RETINITIS PIGMENTOSA 81; RP81","url":"https://www.omim.org/entry/617871"},{"mim_id":"617649","title":"UBIQUITIN-CONJUGATING ENZYME E2 O; UBE2O","url":"https://www.omim.org/entry/617649"},{"mim_id":"617346","title":"ATP/GTP-BINDING PROTEIN-LIKE 3; AGBL3","url":"https://www.omim.org/entry/617346"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"testis","ntpm":53.7}],"url":"https://www.proteinatlas.org/search/TTLL5"},"hgnc":{"alias_symbol":["STAMP"],"prev_symbol":["KIAA0998"]},"alphafold":{"accession":"Q6EMB2","domains":[{"cath_id":"-","chopping":"670-695_708-772_783-818","consensus_level":"high","plddt":81.9183,"start":670,"end":818}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6EMB2","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q6EMB2-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q6EMB2-F1-predicted_aligned_error_v6.png","plddt_mean":61.41},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TTLL5","jax_strain_url":"https://www.jax.org/strain/search?query=TTLL5"},"sequence":{"accession":"Q6EMB2","fasta_url":"https://rest.uniprot.org/uniprotkb/Q6EMB2.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q6EMB2/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q6EMB2"}},"corpus_meta":[{"pmid":"16061724","id":"PMC_16061724","title":"DC-STAMP 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Transfected STAMP increases TIF2 effects in GR-mediated repression and induction; siRNA knockdown of endogenous STAMP reduces both induction and repression of endogenous GR-regulated genes. Endogenous STAMP colocalizes with GR in intact cells and is recruited to promoters of GR-induced and -repressed genes.\",\n      \"method\": \"Co-immunoprecipitation, siRNA knockdown of endogenous STAMP, chromatin immunoprecipitation (ChIP) on endogenous gene promoters, colocalization by fluorescence microscopy\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal binding shown, ChIP at endogenous promoters, siRNA knockdown of endogenous gene with defined transcriptional phenotype, multiple orthogonal methods in one study\",\n      \"pmids\": [\"17116691\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"STAMP (TTLL5) forms a ternary complex with glucocorticoid receptor (GR) and coactivator TIF2. Different protein domains of GR, TIF2, and STAMP independently modulate the maximal activity (A_max), agonist potency (EC50), and partial agonist activity (PAA) of GR-mediated gene induction, demonstrating that these three parameters of transcriptional regulation can be independently controlled by distinct molecular interactions within the complex.\",\n      \"method\": \"Transfection of differentially sized protein fragments, reporter gene assays for A_max/EC50/PAA, endogenous gene assays\",\n      \"journal\": \"Molecular and cellular endocrinology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple fragment combinations tested with functional readouts, single lab, builds on prior STAMP characterization\",\n      \"pmids\": [\"22342989\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"STAMP (TTLL5) overexpression reduces the growth rate of HEK293 cells in a steroid-independent manner. siRNA knockdown of STAMP alters proliferation of ovarian cancer cell lines in a cell-line-specific manner, indicating a physiological role for STAMP in modulating cell growth rates independent of steroid hormone signaling.\",\n      \"method\": \"Stable transfection of STAMP in HEK293 cells (growth rate measurement), siRNA knockdown in multiple ovarian cancer cell lines (proliferation assay)\",\n      \"journal\": \"BMC cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function (siRNA) and gain-of-function (stable overexpression) with defined proliferation phenotype; single lab, multiple cell lines tested\",\n      \"pmids\": [\"20374646\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Disruption of the Ttll5/STAMP gene in male mice causes substantial reduction in α-tubulin polyglutamylation specifically in sperm tails, leading to abnormal axonemal structures with loss of tubulin doublets, defective progressive sperm motility, and male infertility. The defect in tubulin polyglutamylation was closely correlated with reduction in mutant STAMP mRNA levels. Axonemes in other tissues appeared unaffected, indicating a unique, tissue-selective TTLL5-mediated pathway for α-tubulin polyglutamylation required for sperm maturation.\",\n      \"method\": \"Targeted mouse knockout/internal deletion of Stamp gene; electron microscopy of sperm axonemes; biochemical measurement of α-tubulin polyglutamylation; sperm motility assays; RT-qPCR of TTLL genes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo knockout mouse model with electron microscopy, biochemical quantification of polyglutamylation, and motility phenotype; multiple orthogonal methods in one study\",\n      \"pmids\": [\"23558686\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TTLL5 directly glutamylates RPGR(ORF15) — a photoreceptor-specific isoform of the X-linked retinitis pigmentosa GTPase regulator — in its Glu-Gly-rich repetitive region containing motifs homologous to the α-tubulin C-terminal tail. The C-terminal basic domain of RPGR(ORF15) binds to a noncatalytic cofactor interaction domain unique to TTLL5 among TTLL family glutamylases, targeting TTLL5 specifically to RPGR. Only TTLL5, and not other TTLL family glutamylases, interacts with RPGR(ORF15) in cells. A Ttll5 mutant mouse shows complete loss of RPGR glutamylation without marked changes in tubulin glutamylation, and develops photoreceptor degeneration with early mislocalization of cone opsins resembling Rpgr-null mice. TTLL5 disease mutants causing human retinal dystrophy show impaired glutamylation of RPGR(ORF15).\",\n      \"method\": \"In vitro glutamylation assay; co-immunoprecipitation of TTLL5 and RPGR(ORF15); domain mapping (C-terminal basic domain of RPGR, cofactor interaction domain of TTLL5); Ttll5 mutant mouse biochemical analysis (anti-glutamylation immunoblot/immunofluorescence); retinal phenotyping (cone opsin localization, histology); functional analysis of disease-associated TTLL5 mutants\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro enzymatic assay, domain mapping, Co-IP, in vivo mouse model with biochemical and phenotypic validation, disease mutant functional testing; multiple orthogonal methods establishing substrate specificity and disease mechanism\",\n      \"pmids\": [\"27162334\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Biallelic loss-of-function variants in TTLL5 (encoding a tubulin glutamylase) cause cone, cone-rod, and macular dystrophies in humans. In human and murine retinae, TTLL5 localizes to the centrioles at the base of the connecting cilium of photoreceptors, consistent with a role in polyglutamylation of primary cilia.\",\n      \"method\": \"Exome sequencing and gene-based case-control association in retinal dystrophy patients; immunolocalization of TTLL5 in human and murine retinal sections\",\n      \"journal\": \"American journal of human genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct subcellular localization by immunofluorescence tied to disease context; genetic loss-of-function in humans; single study but with consistent findings across multiple families\",\n      \"pmids\": [\"24791901\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Mutations in TTLL5 in humans cause cone-rod degeneration and are associated with reduced male fertility in patients carrying truncating variants. TTLL5 protein localizes to the basal body of photoreceptor cells in rat retina and to the centrosome of the spermatozoon flagellum in humans, suggesting a common polyglutamylation mechanism in both cell types.\",\n      \"method\": \"Next-generation sequencing and autozygome-based screening; immunofluorescence localization of TTLL5 in rat retina and human sperm; sperm motility analysis in affected patients\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — direct protein localization in two tissue types, human genetic loss-of-function with correlated fertility phenotype; single lab\",\n      \"pmids\": [\"28173158\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TTLL5 (also known as STAMP/KIAA0998) is a tubulin tyrosine ligase-like polyglutamylase that has two established mechanistic roles: (1) it directly glutamylates RPGR(ORF15) at its Glu-Gly-rich domain via a unique noncatalytic cofactor interaction domain, with this modification being essential for photoreceptor function such that loss of TTLL5 causes cone photoreceptor degeneration; and (2) it mediates tissue-selective α-tubulin polyglutamylation in sperm flagella required for normal axonemal structure and male fertility. Additionally, TTLL5/STAMP functions as a transcriptional comodulator that forms a ternary complex with glucocorticoid receptor and p160 coactivators (TIF2/SRC-1), independently modulating maximal induction, agonist potency, and partial agonist activity of GR-regulated genes, and can also reduce cell proliferation in a steroid-independent manner.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TTLL5 (STAMP/KIAA0998) is a tubulin tyrosine ligase-like polyglutamylase that installs glutamate side chains on specific substrates to control ciliary and flagellar function [#3, #4]. Its best-defined catalytic role is the direct glutamylation of RPGR(ORF15), the photoreceptor-specific isoform of the retinitis pigmentosa GTPase regulator, within its α-tubulin-like Glu-Gly-rich repeat region; this substrate selectivity is conferred by a noncatalytic cofactor interaction domain unique to TTLL5 that engages the C-terminal basic domain of RPGR(ORF15), so that among TTLL family enzymes only TTLL5 modifies RPGR [#4]. Loss of TTLL5 abolishes RPGR glutamylation and causes cone opsin mislocalization and photoreceptor degeneration, and biallelic loss-of-function variants in humans cause cone, cone-rod, and macular dystrophies, with TTLL5 localizing to the centrioles/basal body at the base of the photoreceptor connecting cilium [#4, #5]. In parallel, TTLL5 mediates a tissue-selective α-tubulin polyglutamylation of the sperm flagellar axoneme; its disruption in mice reduces sperm-tail tubulin polyglutamylation, disrupts axonemal doublet structure and motility, and causes male infertility, with the protein localizing to the spermatozoon flagellar centrosome [#3, #6]. Independently of this catalytic activity, TTLL5/STAMP acts as a transcriptional comodulator that associates with the p160 coactivators TIF2 and SRC-1, colocalizes with and is recruited to promoters of glucocorticoid receptor-regulated genes, and forms a ternary complex with GR and TIF2 in which distinct domains independently tune maximal induction, agonist potency, and partial agonist activity [#0, #1]; it also reduces cell proliferation in a steroid-independent manner [#2].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Established TTLL5/STAMP's first known function as a steroid receptor coregulator, answering whether it participates in transcriptional control by linking it to p160 coactivators and GR-regulated genes.\",\n      \"evidence\": \"Co-IP, siRNA knockdown of endogenous STAMP, and ChIP at endogenous GR-regulated promoters with colocalization microscopy\",\n      \"pmids\": [\"17116691\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address any enzymatic/polyglutamylase activity\", \"Mechanism of how STAMP alters coactivator function not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed STAMP modulates cell growth independent of steroid signaling, indicating a physiological role beyond hormone-regulated transcription.\",\n      \"evidence\": \"Stable overexpression in HEK293 and siRNA knockdown across multiple ovarian cancer cell lines with proliferation readouts\",\n      \"pmids\": [\"20374646\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of the growth effect unidentified\", \"Cell-line-specific responses unexplained\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Dissected how STAMP shapes GR transcriptional output, showing distinct domain interactions independently set maximal activity, potency, and partial agonist activity.\",\n      \"evidence\": \"Protein fragment transfections with reporter and endogenous gene assays measuring A_max/EC50/PAA in a GR-TIF2-STAMP ternary complex\",\n      \"pmids\": [\"22342989\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of the ternary complex not determined\", \"Single lab; no orthogonal confirmation of independent parameter control\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined the first catalytic in vivo role by showing TTLL5 drives tissue-selective sperm-tail α-tubulin polyglutamylation required for axonemal integrity and male fertility.\",\n      \"evidence\": \"Targeted mouse Stamp deletion with sperm axoneme EM, biochemical polyglutamylation quantification, and motility assays\",\n      \"pmids\": [\"23558686\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of tissue selectivity unexplained\", \"Did not identify how polyglutamylation stabilizes doublets\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Connected human retinal dystrophy to TTLL5 loss and placed the protein at the photoreceptor connecting cilium base, implicating ciliary polyglutamylation.\",\n      \"evidence\": \"Exome sequencing/case-control in retinal dystrophy patients with TTLL5 immunolocalization in human and murine retina\",\n      \"pmids\": [\"24791901\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct substrate in photoreceptors not yet identified\", \"Causal mechanism linking variants to degeneration not established\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified RPGR(ORF15) as a direct, TTLL5-specific glutamylation substrate and defined the unique cofactor interaction domain underlying substrate targeting and disease.\",\n      \"evidence\": \"In vitro glutamylation assays, Co-IP, domain mapping, Ttll5 mutant mouse biochemistry/retinal phenotyping, and functional testing of human disease mutants\",\n      \"pmids\": [\"27162334\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry/site mapping of RPGR glutamylation not resolved\", \"How RPGR glutamylation supports opsin trafficking unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Unified the retinal and reproductive phenotypes by showing TTLL5 localizes to both the photoreceptor basal body and the sperm flagellar centrosome, with truncating variants associated with reduced fertility.\",\n      \"evidence\": \"NGS/autozygome screening with TTLL5 immunofluorescence in rat retina and human sperm plus patient motility analysis\",\n      \"pmids\": [\"28173158\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab localization\", \"Did not biochemically confirm shared substrate across the two tissues\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TTLL5's catalytic polyglutamylase activity and its noncatalytic role as a GR/p160 transcriptional comodulator are mechanistically and physiologically integrated remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structural model of the cofactor interaction domain or the GR-TIF2-STAMP complex\", \"Whether the proliferation and transcriptional roles depend on enzymatic activity is untested\", \"No reconstituted polyglutamylation showing chain length/site preference\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0016740\", \"supporting_discovery_ids\": [3, 4]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [0, 1]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [5, 6]},\n      {\"term_id\": \"GO:0005929\", \"supporting_discovery_ids\": [5]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"R-HSA-9709957\", \"supporting_discovery_ids\": [4, 5]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [\"GR-TIF2-STAMP ternary complex\"],\n    \"partners\": [\"RPGR\", \"TIF2\", \"SRC-1\", \"NR3C1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":5,"faith_total":5,"faith_pct":100.0}}