{"gene":"TDRD6","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2009,"finding":"TDRD6 directly physically interacts with the chromatoid body components Mili and Miwi in mouse testes, and this interaction depends on symmetrically dimethylated arginine (sDMA) modifications on Miwi. TDRD6 is essential for chromatoid body architecture; in Tdrd6-/- mice, Mael, Miwi, and Mvh fail to localize to chromatoid bodies, which become 'ghost' structures.","method":"Co-immunoprecipitation of endogenous proteins, Tdrd6 knockout mouse model, immunofluorescence localization, electron microscopy of chromatoid body ultrastructure","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP of endogenous proteins, KO mouse with defined structural phenotype, replicated by multiple orthogonal methods in one study and consistent with findings from other labs","pmids":["19345099"],"is_preprint":false},{"year":2009,"finding":"TDRD6 loss in mice results in abrogated development from round to elongated spermatids, establishing TDRD6 as essential for spermiogenesis progression.","method":"Tdrd6-/- knockout mouse model with histological analysis of spermatid development stages","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean KO with defined cellular phenotype, independently replicated by multiple labs","pmids":["19345099"],"is_preprint":false},{"year":2009,"finding":"TDRD6 loss leads to upregulation of more than 50 miRNAs (including precursor and primary forms) in testes, indicating TDRD6 is required for proper mature and precursor miRNA expression within the chromatoid body.","method":"Small RNA profiling and quantitative RT-PCR in Tdrd6-/- mouse testes","journal":"Current biology : CB","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse, genome-wide small RNA profiling, multiple orthogonal validations","pmids":["19345099"],"is_preprint":false},{"year":2009,"finding":"Miwi binds to Tdrd6 in an sDMA-dependent manner, demonstrating that Tudor domain-containing proteins recognize symmetrically dimethylated arginine residues on PIWI family proteins as a conserved germline interaction mechanism.","method":"Co-immunoprecipitation and mass spectrometry identification of sDMA modifications on Miwi N-terminal RG repeats; sDMA-dependence shown by arginine methylation inhibition","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP plus mass spectrometry identification of methylation, corroborated by independent labs (PMID 19918066, 19345099)","pmids":["19926723","19345099","19918066"],"is_preprint":false},{"year":2006,"finding":"TDRD6 localizes to nuage/chromatoid bodies in postnatal male germ cells and forms a ribonucleoprotein complex together with TDRD1/MTR-1 and TDRD7/TRAP. This co-localization is disrupted in Mvh/Ddx4 mutant mice, placing TDRD6 downstream of Mvh in the nuage assembly pathway.","method":"Immunofluorescence localization in wild-type and Mvh mutant mice, co-immunoprecipitation, in vivo over-expression of truncated dominant-negative forms","journal":"Developmental biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct localization by immunofluorescence, Co-IP, epistasis via Mvh mutant, independently replicated","pmids":["17141210"],"is_preprint":false},{"year":2010,"finding":"The mouse Vasa homolog (MVH) associates with TDRD6, as well as with TDRD1, Mili, and Miwi, and MVH contains symmetrically and asymmetrically dimethylated arginines produced by PRMT5, indicating that arginine methylation directs MVH interactions with Tudor domain proteins including TDRD6.","method":"Co-immunoprecipitation of endogenous proteins, mass spectrometry detection of dimethylarginine on MVH","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of endogenous proteins with MS, single lab, interaction not mapped to specific domain of TDRD6","pmids":["20080973"],"is_preprint":false},{"year":2011,"finding":"TDRD6 and TDRD7 orchestrate distinct, sequential steps of chromatoid body biogenesis in concert: TDRD7 mediates initial establishment and fusion of chromatoid bodies with processing bodies/GW bodies, while TDRD6 functions at a later stage when chromatoid bodies exhibit aggresome-like properties. Double knockouts of Tdrd7 and Tdrd6 demonstrate additive defects in ordered chromatoid body remodeling. TDRD6 does not affect LINE1 retrotransposon suppression, unlike TDRD7.","method":"Single and double Tdrd7/Tdrd6 knockout mice, immunofluorescence, electron microscopy, retrotransposon expression analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic epistasis via double KO, multiple orthogonal methods, independent lab from original Tdrd6 KO study","pmids":["21670278"],"is_preprint":false},{"year":2016,"finding":"TDRD6 is required for UPF1 localization to chromatoid bodies, for UPF1-UPF2 and UPF1-MVH protein interactions, and for the association of long 3' UTR mRNAs with UPF1 and UPF2. Loss of TDRD6 specifically impairs the long 3' UTR-stimulated pathway of nonsense-mediated mRNA decay (NMD) but not the downstream exon-exon junction-triggered NMD pathway, resulting in increased stability and enhanced translation of long 3' UTR mRNAs.","method":"Proteome analysis of purified chromatoid bodies, immunofluorescence, co-immunoprecipitation of UPF1-UPF2/MVH complexes, RNA immunoprecipitation, mRNA stability and polysome assays in Tdrd6-/- mice","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — KO mouse, multiple orthogonal methods (proteomics, Co-IP, RIP, polysome profiling), pathway-specific NMD dissection","pmids":["27149095"],"is_preprint":false},{"year":2017,"finding":"In meiotic prophase I spermatocytes, TDRD6 interacts with PRMT5 (protein arginine methyltransferase 5) and with spliceosomal core protein SmB in an RNA-independent, arginine-methylation-dependent manner. Loss of TDRD6 reduces PRMT5-SmB association and SmB arginine dimethylation, impairs spliceosome assembly (with 3.5-fold increased U5 snRNP levels), decreases SMN-positive bodies and Cajal bodies in the nucleus, and causes widespread splicing defects including aberrant exon/intron usage.","method":"Co-immunoprecipitation, arginine methylation assays, snRNP complex analysis, immunofluorescence of nuclear bodies, transcriptome analysis of Tdrd6-/- diplotene spermatocytes","journal":"PLoS genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, methylation assay, transcriptome-wide splicing analysis, and nuclear body imaging all converge on spliceosome maturation role; multiple orthogonal methods","pmids":["28263986"],"is_preprint":false},{"year":2018,"finding":"In zebrafish, Tdrd6a (ortholog of TDRD6) interacts directly with Bucky ball (Buc), a prion-like protein required for Balbiani body formation. This interaction affects Buc mobility and aggregation properties, regulating formation and disassembly of phase-separated germ plasm compartments. Loss of Tdrd6a-Buc interaction causes significant defects in germ cell development.","method":"Co-immunoprecipitation, FRAP (fluorescence recovery after photobleaching) to measure protein mobility, genetic loss-of-function analysis in zebrafish","journal":"Developmental cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, FRAP, and genetic KO with defined developmental phenotype; multiple orthogonal methods in one study","pmids":["30086300"],"is_preprint":false},{"year":2024,"finding":"MIWI N-terminal arginines (NTRs) mediate direct interactions with TDRD6 that are necessary for chromatoid body compaction during spermiogenesis. Loss of MIWI NTR-TDRD6 interaction leads to failure of chromatoid body compaction.","method":"Mouse genetic models with MIWI NTR mutations, immunofluorescence analysis of chromatoid body morphology","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mouse genetic model with specific domain mutation, single lab, localization phenotype defined","pmids":["38520410"],"is_preprint":false},{"year":2024,"finding":"Bi-allelic loss-of-function variants in TDRD6 in humans cause oligoasthenoteratozoospermia with acrosomal hypoplasia, mislocalisation of chromatoid body components DDX4/MVH and UPF1 in round spermatids, and defects in mRNA metabolism in spermatid differentiation. Tdrd6-knockout mice recapitulate the acrosome formation defect, confirming a conserved role in acrosome biogenesis.","method":"Whole-exome sequencing, immunofluorescence, immunoblotting, ultrastructural analysis, CRISPR-Cas9 Tdrd6-KO mice, single-cell RNA-seq and total RNA-seq","journal":"Journal of medical genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetics confirmed by orthogonal mouse KO model, multiple methods including scRNA-seq, ultrastructural and immunofluorescence analyses","pmids":["38341271"],"is_preprint":false},{"year":2007,"finding":"TDRD6 was identified as a major autoantigen in autoimmune polyendocrine syndrome type 1 (APS1) patients, with 49% of patients showing immunoreactivity against in vitro translated TDRD6 fragments, suggesting TDRD6 protein expression in anterior pituitary cells.","method":"Screening of pituitary cDNA expression library with APS1 sera, in vitro translation and immunoreactivity testing, immunohistochemistry of pituitary tissue","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Low","confidence_rationale":"Tier 3 / Weak — identification as autoantigen by library screening and immunohistochemistry; no functional mechanism established for TDRD6 protein itself","pmids":["17215373"],"is_preprint":false}],"current_model":"TDRD6 is a multi-Tudor domain protein expressed in male germ cells that functions as a structural scaffold of the chromatoid body (CB), where it directly binds symmetrically dimethylated arginine (sDMA)-modified PIWI proteins (Miwi/Mili) and MVH to maintain CB architecture; within the CB it promotes UPF1-UPF2 interactions and UPF1 localization to support long 3' UTR-triggered nonsense-mediated mRNA decay; in meiotic spermatocytes it interacts with PRMT5 and mediates arginine methylation of the spliceosomal protein SmB to facilitate spliceosome maturation and correct pre-mRNA splicing; and its N-terminal-arginine-mediated interaction with MIWI is required for CB compaction, while in zebrafish its ortholog regulates phase separation of germ plasm by modulating the aggregation properties of the prion-like protein Bucky ball."},"narrative":{"mechanistic_narrative":"TDRD6 is a multi-Tudor domain protein of male germ cells that serves as a structural scaffold of the chromatoid body (CB), the perinuclear ribonucleoprotein granule governing post-transcriptional RNA control during spermiogenesis [PMID:19345099, PMID:17141210]. It is recruited into nuage downstream of the RNA helicase MVH and assembles with the related Tudor proteins TDRD1 and TDRD7 into a ribonucleoprotein complex [PMID:17141210]; within this network TDRD6 directly engages the PIWI proteins MILI and MIWI and MVH by recognizing their symmetrically dimethylated arginine (sDMA) residues, a methylarginine-reading interaction required to retain these components within the CB [PMID:19345099, PMID:19926723, PMID:19918066]. TDRD6 and TDRD7 act at sequential stages of CB biogenesis, with TDRD6 operating at a later, aggresome-like remodeling step and MIWI N-terminal arginine contacts driving CB compaction [PMID:21670278, PMID:38520410]. Loss of TDRD6 converts CBs into 'ghost' structures, dysregulates miRNA processing, and arrests development from round to elongated spermatids [PMID:19345099]. Beyond scaffolding, TDRD6 executes specific RNA-regulatory functions: it organizes UPF1/UPF2 interactions and the long-3'UTR-stimulated branch of nonsense-mediated mRNA decay within the CB [PMID:27149095], and in meiotic spermatocytes it cooperates with PRMT5 to promote arginine methylation of the Sm protein SmB, enabling spliceosome maturation and correct pre-mRNA splicing [PMID:28263986]. Bi-allelic loss-of-function TDRD6 variants in humans cause oligoasthenoteratozoospermia with acrosomal hypoplasia and mislocalization of CB components, a defect recapitulated in Tdrd6-knockout mice [PMID:38341271].","teleology":[{"year":2006,"claim":"Establishing where TDRD6 acts and what it associates with defined it as a nuage/CB component rather than a diffuse cytoplasmic factor.","evidence":"Immunofluorescence in wild-type and Mvh-mutant mice with Co-IP showing a TDRD1/TDRD6/TDRD7 complex placed downstream of MVH","pmids":["17141210"],"confidence":"High","gaps":["Did not define which TDRD6 domains mediate complex assembly","Functional consequence of complex formation not yet tested"]},{"year":2009,"claim":"Knockout and interaction studies established TDRD6 as a methylarginine-dependent scaffold essential for CB architecture and spermiogenesis, not merely a CB resident.","evidence":"Tdrd6 knockout mouse with EM of CB ultrastructure, reciprocal Co-IP of endogenous MILI/MIWI/MVH, and small-RNA profiling","pmids":["19345099","19926723","19918066"],"confidence":"High","gaps":["Mechanism linking CB collapse to spermatid arrest not resolved","Direct RNA targets within the CB not identified at this stage"]},{"year":2011,"claim":"Comparing single and double Tdrd6/Tdrd7 knockouts ordered CB biogenesis into discrete steps, assigning TDRD6 to a late aggresome-like remodeling stage and uncoupling it from transposon control.","evidence":"Single and double Tdrd7/Tdrd6 knockout mice with EM and retrotransposon expression analysis","pmids":["21670278"],"confidence":"High","gaps":["Molecular basis of the late-stage remodeling activity not defined","How TDRD6 and TDRD7 functions are temporally coordinated unclear"]},{"year":2016,"claim":"Dissecting CB RNA regulation revealed a specific function: TDRD6 enables the long-3'UTR-stimulated NMD pathway by organizing UPF1/UPF2/MVH complexes.","evidence":"CB proteomics, Co-IP, RIP, and polysome/mRNA-stability assays in Tdrd6-/- mice","pmids":["27149095"],"confidence":"High","gaps":["Whether TDRD6 binds UPF1 directly or bridges via methylarginine not established","Identity of physiologically critical long-3'UTR targets incomplete"]},{"year":2017,"claim":"Identifying a PRMT5/SmB axis showed TDRD6 has a nuclear-relevant role in spliceosome maturation, extending its function beyond CB scaffolding.","evidence":"Co-IP, arginine methylation and snRNP assembly assays, nuclear-body imaging, and transcriptome splicing analysis in diplotene spermatocytes","pmids":["28263986"],"confidence":"High","gaps":["How TDRD6 promotes PRMT5-SmB methylation mechanistically unresolved","Relationship between cytoplasmic CB role and meiotic splicing role unclear"]},{"year":2018,"claim":"The zebrafish ortholog linked TDRD6 to phase-separation control, framing its scaffolding as modulation of biomolecular condensate dynamics.","evidence":"Co-IP, FRAP mobility measurements, and genetic loss-of-function in zebrafish for Tdrd6a-Bucky ball","pmids":["30086300"],"confidence":"High","gaps":["Whether mammalian TDRD6 regulates condensate phase behavior analogously not shown","Direct biophysical interaction with prion-like domains not mapped"]},{"year":2024,"claim":"Human genetics and refined mouse models confirmed TDRD6 as a disease gene and tied its scaffolding to acrosome biogenesis and CB compaction.","evidence":"Whole-exome sequencing of patients with CRISPR Tdrd6-KO mice, MIWI N-terminal arginine mutant mice, immunofluorescence, and single-cell RNA-seq","pmids":["38341271","38520410"],"confidence":"High","gaps":["Mechanism connecting CB defects to acrosomal hypoplasia not detailed","Whether MIWI-NTR contacts and methylarginine reading are the same binding event unresolved"]},{"year":null,"claim":"It remains unknown how TDRD6's distinct activities — CB scaffolding, long-3'UTR NMD, PRMT5-dependent splicing, and condensate regulation — are mechanistically integrated through its Tudor domains.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of TDRD6 Tudor domains bound to methylarginine partners in the corpus","Domain requirements for each functional output not separated","Whether human and zebrafish functions fully overlap untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,4,7]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[7]}],"localization":[{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[0,4,6]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[8]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[2,7,8]},{"term_id":"R-HSA-1474165","term_label":"Reproduction","supporting_discovery_ids":[1,11]},{"term_id":"R-HSA-1852241","term_label":"Organelle biogenesis and maintenance","supporting_discovery_ids":[4,6]}],"complexes":["chromatoid body","Balbiani body / germ plasm"],"partners":["MIWI","MILI","MVH/DDX4","TDRD1","TDRD7","UPF1","PRMT5","SMB"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O60522","full_name":"Tudor domain-containing protein 6","aliases":["Antigen NY-CO-45","Cancer/testis antigen 41.2","CT41.2"],"length_aa":2096,"mass_kda":236.5,"function":"Tudor domain-containing protein involved in germ cell development, more specifically the formation of chromatoid body (during spermiogenesis), Balbiani body (during oogenesis), germ plasm (upon fertilization), and for proper miRNA expression and spliceosome maturation (By similarity). Essential for RNA-dependent helicase UPF1 localization to chromatoid body, for UPF1-UPF2 and UPF1-DDX4 interactions which are required for mRNA degradation, using the extended 3' UTR-triggered nonsense-mediated mRNA decay (NMD) pathway. Involved in spliceosome maturation and mRNA splicing in prophase I spermatocytes through interaction with arginine N-methyltransferase PRMT5 and symmetrically arginine dimethylated SNRPB (small nuclear ribonucleoprotein-associated protein) (By similarity)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/O60522/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TDRD6","classification":"Not Classified","n_dependent_lines":0,"n_total_lines":1208,"dependency_fraction":0.0},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/TDRD6","total_profiled":1310},"omim":[{"mim_id":"611200","title":"TUDOR DOMAIN-CONTAINING PROTEIN 6; TDRD6","url":"https://www.omim.org/entry/611200"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Endoplasmic reticulum","reliability":"Approved"},{"location":"Vesicles","reliability":"Approved"},{"location":"Cytosol","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"testis","ntpm":25.9}],"url":"https://www.proteinatlas.org/search/TDRD6"},"hgnc":{"alias_symbol":["NY-CO-45","bA446F17.4","CT41.2","SPATA36"],"prev_symbol":[]},"alphafold":{"accession":"O60522","domains":[{"cath_id":"2.30.30.140","chopping":"13-57_68-138_149-217","consensus_level":"high","plddt":80.4043,"start":13,"end":217},{"cath_id":"2.30.30.140","chopping":"251-288_309-449","consensus_level":"high","plddt":80.0246,"start":251,"end":449},{"cath_id":"2.40.50.90","chopping":"488-518_535-668","consensus_level":"medium","plddt":85.5117,"start":488,"end":668},{"cath_id":"2.40.50.90","chopping":"1295-1344_1413-1477","consensus_level":"medium","plddt":82.1519,"start":1295,"end":1477},{"cath_id":"2.30.30.140","chopping":"1347-1405","consensus_level":"medium","plddt":85.2775,"start":1347,"end":1405},{"cath_id":"2.30.30.140","chopping":"1521-1697","consensus_level":"medium","plddt":79.2064,"start":1521,"end":1697},{"cath_id":"2.30.30,2.30.30","chopping":"2032-2076","consensus_level":"medium","plddt":79.3509,"start":2032,"end":2076}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60522","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60522-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60522-F1-predicted_aligned_error_v6.png","plddt_mean":64.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=TDRD6","jax_strain_url":"https://www.jax.org/strain/search?query=TDRD6"},"sequence":{"accession":"O60522","fasta_url":"https://rest.uniprot.org/uniprotkb/O60522.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60522/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60522"}},"corpus_meta":[{"pmid":"12124339","id":"PMC_12124339","title":"Cancer-related 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TDRD6 is essential for chromatoid body architecture; in Tdrd6-/- mice, Mael, Miwi, and Mvh fail to localize to chromatoid bodies, which become 'ghost' structures.\",\n      \"method\": \"Co-immunoprecipitation of endogenous proteins, Tdrd6 knockout mouse model, immunofluorescence localization, electron microscopy of chromatoid body ultrastructure\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP of endogenous proteins, KO mouse with defined structural phenotype, replicated by multiple orthogonal methods in one study and consistent with findings from other labs\",\n      \"pmids\": [\"19345099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TDRD6 loss in mice results in abrogated development from round to elongated spermatids, establishing TDRD6 as essential for spermiogenesis progression.\",\n      \"method\": \"Tdrd6-/- knockout mouse model with histological analysis of spermatid development stages\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean KO with defined cellular phenotype, independently replicated by multiple labs\",\n      \"pmids\": [\"19345099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TDRD6 loss leads to upregulation of more than 50 miRNAs (including precursor and primary forms) in testes, indicating TDRD6 is required for proper mature and precursor miRNA expression within the chromatoid body.\",\n      \"method\": \"Small RNA profiling and quantitative RT-PCR in Tdrd6-/- mouse testes\",\n      \"journal\": \"Current biology : CB\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse, genome-wide small RNA profiling, multiple orthogonal validations\",\n      \"pmids\": [\"19345099\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Miwi binds to Tdrd6 in an sDMA-dependent manner, demonstrating that Tudor domain-containing proteins recognize symmetrically dimethylated arginine residues on PIWI family proteins as a conserved germline interaction mechanism.\",\n      \"method\": \"Co-immunoprecipitation and mass spectrometry identification of sDMA modifications on Miwi N-terminal RG repeats; sDMA-dependence shown by arginine methylation inhibition\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP plus mass spectrometry identification of methylation, corroborated by independent labs (PMID 19918066, 19345099)\",\n      \"pmids\": [\"19926723\", \"19345099\", \"19918066\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"TDRD6 localizes to nuage/chromatoid bodies in postnatal male germ cells and forms a ribonucleoprotein complex together with TDRD1/MTR-1 and TDRD7/TRAP. This co-localization is disrupted in Mvh/Ddx4 mutant mice, placing TDRD6 downstream of Mvh in the nuage assembly pathway.\",\n      \"method\": \"Immunofluorescence localization in wild-type and Mvh mutant mice, co-immunoprecipitation, in vivo over-expression of truncated dominant-negative forms\",\n      \"journal\": \"Developmental biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization by immunofluorescence, Co-IP, epistasis via Mvh mutant, independently replicated\",\n      \"pmids\": [\"17141210\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"The mouse Vasa homolog (MVH) associates with TDRD6, as well as with TDRD1, Mili, and Miwi, and MVH contains symmetrically and asymmetrically dimethylated arginines produced by PRMT5, indicating that arginine methylation directs MVH interactions with Tudor domain proteins including TDRD6.\",\n      \"method\": \"Co-immunoprecipitation of endogenous proteins, mass spectrometry detection of dimethylarginine on MVH\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of endogenous proteins with MS, single lab, interaction not mapped to specific domain of TDRD6\",\n      \"pmids\": [\"20080973\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"TDRD6 and TDRD7 orchestrate distinct, sequential steps of chromatoid body biogenesis in concert: TDRD7 mediates initial establishment and fusion of chromatoid bodies with processing bodies/GW bodies, while TDRD6 functions at a later stage when chromatoid bodies exhibit aggresome-like properties. Double knockouts of Tdrd7 and Tdrd6 demonstrate additive defects in ordered chromatoid body remodeling. TDRD6 does not affect LINE1 retrotransposon suppression, unlike TDRD7.\",\n      \"method\": \"Single and double Tdrd7/Tdrd6 knockout mice, immunofluorescence, electron microscopy, retrotransposon expression analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic epistasis via double KO, multiple orthogonal methods, independent lab from original Tdrd6 KO study\",\n      \"pmids\": [\"21670278\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TDRD6 is required for UPF1 localization to chromatoid bodies, for UPF1-UPF2 and UPF1-MVH protein interactions, and for the association of long 3' UTR mRNAs with UPF1 and UPF2. Loss of TDRD6 specifically impairs the long 3' UTR-stimulated pathway of nonsense-mediated mRNA decay (NMD) but not the downstream exon-exon junction-triggered NMD pathway, resulting in increased stability and enhanced translation of long 3' UTR mRNAs.\",\n      \"method\": \"Proteome analysis of purified chromatoid bodies, immunofluorescence, co-immunoprecipitation of UPF1-UPF2/MVH complexes, RNA immunoprecipitation, mRNA stability and polysome assays in Tdrd6-/- mice\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — KO mouse, multiple orthogonal methods (proteomics, Co-IP, RIP, polysome profiling), pathway-specific NMD dissection\",\n      \"pmids\": [\"27149095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In meiotic prophase I spermatocytes, TDRD6 interacts with PRMT5 (protein arginine methyltransferase 5) and with spliceosomal core protein SmB in an RNA-independent, arginine-methylation-dependent manner. Loss of TDRD6 reduces PRMT5-SmB association and SmB arginine dimethylation, impairs spliceosome assembly (with 3.5-fold increased U5 snRNP levels), decreases SMN-positive bodies and Cajal bodies in the nucleus, and causes widespread splicing defects including aberrant exon/intron usage.\",\n      \"method\": \"Co-immunoprecipitation, arginine methylation assays, snRNP complex analysis, immunofluorescence of nuclear bodies, transcriptome analysis of Tdrd6-/- diplotene spermatocytes\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, methylation assay, transcriptome-wide splicing analysis, and nuclear body imaging all converge on spliceosome maturation role; multiple orthogonal methods\",\n      \"pmids\": [\"28263986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In zebrafish, Tdrd6a (ortholog of TDRD6) interacts directly with Bucky ball (Buc), a prion-like protein required for Balbiani body formation. This interaction affects Buc mobility and aggregation properties, regulating formation and disassembly of phase-separated germ plasm compartments. Loss of Tdrd6a-Buc interaction causes significant defects in germ cell development.\",\n      \"method\": \"Co-immunoprecipitation, FRAP (fluorescence recovery after photobleaching) to measure protein mobility, genetic loss-of-function analysis in zebrafish\",\n      \"journal\": \"Developmental cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, FRAP, and genetic KO with defined developmental phenotype; multiple orthogonal methods in one study\",\n      \"pmids\": [\"30086300\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MIWI N-terminal arginines (NTRs) mediate direct interactions with TDRD6 that are necessary for chromatoid body compaction during spermiogenesis. Loss of MIWI NTR-TDRD6 interaction leads to failure of chromatoid body compaction.\",\n      \"method\": \"Mouse genetic models with MIWI NTR mutations, immunofluorescence analysis of chromatoid body morphology\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mouse genetic model with specific domain mutation, single lab, localization phenotype defined\",\n      \"pmids\": [\"38520410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Bi-allelic loss-of-function variants in TDRD6 in humans cause oligoasthenoteratozoospermia with acrosomal hypoplasia, mislocalisation of chromatoid body components DDX4/MVH and UPF1 in round spermatids, and defects in mRNA metabolism in spermatid differentiation. Tdrd6-knockout mice recapitulate the acrosome formation defect, confirming a conserved role in acrosome biogenesis.\",\n      \"method\": \"Whole-exome sequencing, immunofluorescence, immunoblotting, ultrastructural analysis, CRISPR-Cas9 Tdrd6-KO mice, single-cell RNA-seq and total RNA-seq\",\n      \"journal\": \"Journal of medical genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetics confirmed by orthogonal mouse KO model, multiple methods including scRNA-seq, ultrastructural and immunofluorescence analyses\",\n      \"pmids\": [\"38341271\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"TDRD6 was identified as a major autoantigen in autoimmune polyendocrine syndrome type 1 (APS1) patients, with 49% of patients showing immunoreactivity against in vitro translated TDRD6 fragments, suggesting TDRD6 protein expression in anterior pituitary cells.\",\n      \"method\": \"Screening of pituitary cDNA expression library with APS1 sera, in vitro translation and immunoreactivity testing, immunohistochemistry of pituitary tissue\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — identification as autoantigen by library screening and immunohistochemistry; no functional mechanism established for TDRD6 protein itself\",\n      \"pmids\": [\"17215373\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TDRD6 is a multi-Tudor domain protein expressed in male germ cells that functions as a structural scaffold of the chromatoid body (CB), where it directly binds symmetrically dimethylated arginine (sDMA)-modified PIWI proteins (Miwi/Mili) and MVH to maintain CB architecture; within the CB it promotes UPF1-UPF2 interactions and UPF1 localization to support long 3' UTR-triggered nonsense-mediated mRNA decay; in meiotic spermatocytes it interacts with PRMT5 and mediates arginine methylation of the spliceosomal protein SmB to facilitate spliceosome maturation and correct pre-mRNA splicing; and its N-terminal-arginine-mediated interaction with MIWI is required for CB compaction, while in zebrafish its ortholog regulates phase separation of germ plasm by modulating the aggregation properties of the prion-like protein Bucky ball.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TDRD6 is a multi-Tudor domain protein of male germ cells that serves as a structural scaffold of the chromatoid body (CB), the perinuclear ribonucleoprotein granule governing post-transcriptional RNA control during spermiogenesis [#0, #4]. It is recruited into nuage downstream of the RNA helicase MVH and assembles with the related Tudor proteins TDRD1 and TDRD7 into a ribonucleoprotein complex [#4]; within this network TDRD6 directly engages the PIWI proteins MILI and MIWI and MVH by recognizing their symmetrically dimethylated arginine (sDMA) residues, a methylarginine-reading interaction required to retain these components within the CB [#0, #3]. TDRD6 and TDRD7 act at sequential stages of CB biogenesis, with TDRD6 operating at a later, aggresome-like remodeling step and MIWI N-terminal arginine contacts driving CB compaction [#6, #10]. Loss of TDRD6 converts CBs into 'ghost' structures, dysregulates miRNA processing, and arrests development from round to elongated spermatids [#0, #1, #2]. Beyond scaffolding, TDRD6 executes specific RNA-regulatory functions: it organizes UPF1/UPF2 interactions and the long-3'UTR-stimulated branch of nonsense-mediated mRNA decay within the CB [#7], and in meiotic spermatocytes it cooperates with PRMT5 to promote arginine methylation of the Sm protein SmB, enabling spliceosome maturation and correct pre-mRNA splicing [#8]. Bi-allelic loss-of-function TDRD6 variants in humans cause oligoasthenoteratozoospermia with acrosomal hypoplasia and mislocalization of CB components, a defect recapitulated in Tdrd6-knockout mice [#11].\",\n  \"teleology\": [\n    {\n      \"year\": 2006,\n      \"claim\": \"Establishing where TDRD6 acts and what it associates with defined it as a nuage/CB component rather than a diffuse cytoplasmic factor.\",\n      \"evidence\": \"Immunofluorescence in wild-type and Mvh-mutant mice with Co-IP showing a TDRD1/TDRD6/TDRD7 complex placed downstream of MVH\",\n      \"pmids\": [\"17141210\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define which TDRD6 domains mediate complex assembly\", \"Functional consequence of complex formation not yet tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Knockout and interaction studies established TDRD6 as a methylarginine-dependent scaffold essential for CB architecture and spermiogenesis, not merely a CB resident.\",\n      \"evidence\": \"Tdrd6 knockout mouse with EM of CB ultrastructure, reciprocal Co-IP of endogenous MILI/MIWI/MVH, and small-RNA profiling\",\n      \"pmids\": [\"19345099\", \"19926723\", \"19918066\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism linking CB collapse to spermatid arrest not resolved\", \"Direct RNA targets within the CB not identified at this stage\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Comparing single and double Tdrd6/Tdrd7 knockouts ordered CB biogenesis into discrete steps, assigning TDRD6 to a late aggresome-like remodeling stage and uncoupling it from transposon control.\",\n      \"evidence\": \"Single and double Tdrd7/Tdrd6 knockout mice with EM and retrotransposon expression analysis\",\n      \"pmids\": [\"21670278\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of the late-stage remodeling activity not defined\", \"How TDRD6 and TDRD7 functions are temporally coordinated unclear\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Dissecting CB RNA regulation revealed a specific function: TDRD6 enables the long-3'UTR-stimulated NMD pathway by organizing UPF1/UPF2/MVH complexes.\",\n      \"evidence\": \"CB proteomics, Co-IP, RIP, and polysome/mRNA-stability assays in Tdrd6-/- mice\",\n      \"pmids\": [\"27149095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether TDRD6 binds UPF1 directly or bridges via methylarginine not established\", \"Identity of physiologically critical long-3'UTR targets incomplete\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identifying a PRMT5/SmB axis showed TDRD6 has a nuclear-relevant role in spliceosome maturation, extending its function beyond CB scaffolding.\",\n      \"evidence\": \"Co-IP, arginine methylation and snRNP assembly assays, nuclear-body imaging, and transcriptome splicing analysis in diplotene spermatocytes\",\n      \"pmids\": [\"28263986\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How TDRD6 promotes PRMT5-SmB methylation mechanistically unresolved\", \"Relationship between cytoplasmic CB role and meiotic splicing role unclear\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The zebrafish ortholog linked TDRD6 to phase-separation control, framing its scaffolding as modulation of biomolecular condensate dynamics.\",\n      \"evidence\": \"Co-IP, FRAP mobility measurements, and genetic loss-of-function in zebrafish for Tdrd6a-Bucky ball\",\n      \"pmids\": [\"30086300\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether mammalian TDRD6 regulates condensate phase behavior analogously not shown\", \"Direct biophysical interaction with prion-like domains not mapped\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Human genetics and refined mouse models confirmed TDRD6 as a disease gene and tied its scaffolding to acrosome biogenesis and CB compaction.\",\n      \"evidence\": \"Whole-exome sequencing of patients with CRISPR Tdrd6-KO mice, MIWI N-terminal arginine mutant mice, immunofluorescence, and single-cell RNA-seq\",\n      \"pmids\": [\"38341271\", \"38520410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism connecting CB defects to acrosomal hypoplasia not detailed\", \"Whether MIWI-NTR contacts and methylarginine reading are the same binding event unresolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown how TDRD6's distinct activities — CB scaffolding, long-3'UTR NMD, PRMT5-dependent splicing, and condensate regulation — are mechanistically integrated through its Tudor domains.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of TDRD6 Tudor domains bound to methylarginine partners in the corpus\", \"Domain requirements for each functional output not separated\", \"Whether human and zebrafish functions fully overlap untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 4, 7]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [0, 4, 6]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [2, 7, 8]},\n      {\"term_id\": \"R-HSA-1474165\", \"supporting_discovery_ids\": [1, 11]},\n      {\"term_id\": \"R-HSA-1852241\", \"supporting_discovery_ids\": [4, 6]}\n    ],\n    \"complexes\": [\"chromatoid body\", \"Balbiani body / germ plasm\"],\n    \"partners\": [\"MIWI\", \"MILI\", \"MVH/DDX4\", \"TDRD1\", \"TDRD7\", \"UPF1\", \"PRMT5\", \"SmB\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}