{"gene":"TRIM71","run_date":"2026-06-10T10:51:56","timeline":{"discoveries":[{"year":2000,"finding":"C. elegans LIN-41 acts in the heterochronic pathway downstream of let-7 miRNA and upstream of LIN-29 transcription factor; let-7 mutations cause reiterated heterochronic phenotypes that are suppressed by lin-41 mutations, establishing genetic epistasis. A lin-41::GFP fusion is downregulated at the time let-7 is upregulated, and the lin-41 3'UTR contains two elements complementary to let-7.","method":"Genetic epistasis (suppressor screen, double-mutant analysis), GFP reporter fusion imaging","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal genetic epistasis with multiple alleles, replicated across labs, foundational paper","pmids":["10882102"],"is_preprint":false},{"year":2004,"finding":"let-7 miRNA directly binds the lin-41 3'UTR in vitro via two conserved let-7 complementary sites (LCS1 and LCS2); compensatory mutations in LCS sites that match the let-7(n2853) lesion partially restore lin-41 3'UTR function in vivo, providing direct experimental evidence for miRNA-target binding.","method":"In vitro RNA-binding assay, compensatory mutation analysis in vivo, luciferase reporter assay","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro binding plus in vivo compensatory mutagenesis, replicated concept","pmids":["14729570"],"is_preprint":false},{"year":2008,"finding":"NMR solution structure of the let-7 miRNA:lin-41 mRNA complex at LCS2 reveals a stem-loop with two stem regions separated by an asymmetric internal loop; three uracils form a base triple and two adenines form a base pair in the internal loop, defining structural basis of miRNA-target interaction.","method":"NMR spectroscopy with NOE restraints, torsion angle restraints, and residual dipolar couplings","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution NMR structure with functional restraints, single lab","pmids":["18296482"],"is_preprint":false},{"year":2010,"finding":"NMR solution structure of the let-7:lin-41 complex at LCS1 reveals a stem-loop with non-canonical structural elements (asymmetric internal loop, adenine bulge) within the seed region; comparison with LCS2 structure shows conformational differences correlating with distinct bending between stems.","method":"NMR spectroscopy (solution-state)","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Strong — independent NMR structure complementing LCS2 structure from same lab, structural validation","pmids":["20660479"],"is_preprint":false},{"year":2009,"finding":"Mouse LIN41 (mLin41) acts as an E3 ubiquitin ligase that mediates ubiquitylation of AGO2 in vitro and in vivo; mLin41 interacts with Dicer and Argonaute proteins (Ago1, Ago2, Ago4) via co-precipitation; it colocalizes with P-body markers, Ago2, Mov10, and Tnrc6b in cytoplasmic foci. Overexpression/depletion of mLin41 inversely changes Ago2 protein levels, implicating mLin41 in Ago2 turnover. mLin41 cooperates with Lin-28 to suppress let-7 activity.","method":"In vitro ubiquitylation assay, co-immunoprecipitation, immunofluorescence colocalization, overexpression/knockdown with western blot","journal":"Nature cell biology","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — in vitro reconstitution of E3 ligase activity plus reciprocal co-IPs plus functional overexpression/depletion, replicated by multiple subsequent studies","pmids":["19898466"],"is_preprint":false},{"year":2012,"finding":"TRIM71 associates with AGO2 and microRNAs and represses expression of CDKN1A (p21), a CDK inhibitor; this repression requires the RING domain and specific protein domains for P-body localization. TRIM71 knockdown prolongs G1 phase and slows ESC proliferation, phenotype rescued by CDKN1A depletion, demonstrating TRIM71 promotes G1-S transition via CDKN1A repression.","method":"Co-immunoprecipitation, reporter mRNA repression assay, knockdown/rescue experiments, cell cycle analysis (FACS), P-body localization by immunofluorescence","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal Co-IP, clean KD with defined phenotype, epistatic rescue, multiple orthogonal methods","pmids":["22735451"],"is_preprint":false},{"year":2012,"finding":"TRIM71 promotes translational repression and mRNA decay; the NHL domain is necessary and sufficient to target TRIM71 to RNA, while the RING domain (ubiquitin ligase activity) is dispensable for mRNA repression. Rbl1 and Rbl2 are identified as TRIM71 target mRNAs in mouse ESCs.","method":"RNA-association assays, translational repression reporter assays, domain deletion mutagenesis, mRNA decay assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — mutagenesis separating RNA-binding from ubiquitin ligase activity, multiple orthogonal assays, single lab","pmids":["23125361"],"is_preprint":false},{"year":2013,"finding":"LIN-41 inhibits translation of EGR1 mRNA through binding its cognate mRNA, as part of a let-7/LIN-41 pathway that controls reprogramming; LIN41 regulates a broad array of differentiation genes post-transcriptionally.","method":"Mechanistic studies including mRNA binding assays and translational reporter analysis, knockdown/overexpression during reprogramming","journal":"Cell stem cell","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — functional knockdown/OE with pathway placement and specific translational target identified, single lab","pmids":["24239284"],"is_preprint":false},{"year":2014,"finding":"Human TRIM71 ubiquitinates Lin28B and promotes its proteasomal degradation; the N-terminal RING finger motif of TRIM71 is critical for Lin28B interaction and polyubiquitination. The C-terminal ~50 amino acid stretch unique to Lin28B (vs Lin28A) is essential for TRIM71 interaction. TRIM71-mediated Lin28B degradation consequently promotes let-7 expression.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, knockdown experiments, domain mapping/mutagenesis","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with domain mapping, in vivo ubiquitination assay, single lab","pmids":["24602972"],"is_preprint":false},{"year":2014,"finding":"C. elegans LIN-41 is a translational repressor that controls oocyte growth and meiotic maturation; lin-41 null mutants display premature pachytene cellularization, CDK-1 activation, M-phase entry, and spindle assembly. Translational derepression of CDC-25.3 (CDK-1 activator) contributes to premature M-phase entry. LIN-41 and OMA-1/2 have an antagonistic relationship controlling meiotic maturation.","method":"Genetic null mutant analysis, immunofluorescence (spindle assembly), genetic epistasis","journal":"Genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — null mutant with defined cellular phenotype, epistasis with OMA proteins, replicated across multiple papers","pmids":["25261698"],"is_preprint":false},{"year":2014,"finding":"C. elegans LIN-41 controls onset of developmental plasticity in the germline; LIN-41 is expressed in oocyte cytoplasm and mutations in its predicted RNA-association domain have only minor germline effects (unlike somatic effects), suggesting LIN-41 functions via different molecular mechanisms in germline vs soma.","method":"Structure-function analysis with domain mutations, genetic screens, oocyte phenotype analysis","journal":"PLoS genetics","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mutagenesis with functional phenotypic readout, single lab","pmids":["25167051"],"is_preprint":false},{"year":2017,"finding":"C. elegans LIN41 has two distinct mRNA-silencing activities determined by binding site position: 3'UTR binding leads to mRNA decay of targets mab-10, mab-3, and dmd-3, while 5'UTR binding of the lin-29A isoform causes translational repression. Binding site transplantation experiments demonstrated that the location of the LIN41 binding site specifies the silencing mechanism.","method":"Genome-wide ribosome profiling, RNA immunoprecipitation, in vitro binding, binding site transplantation experiments","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods including ribosome profiling, RIP, and mechanistic transplantation experiments","pmids":["28111013"],"is_preprint":false},{"year":2017,"finding":"LIN41/TRIM71 interacts with p53, controls p53 abundance by ubiquitination, and antagonizes p53-dependent pro-apoptotic and pro-differentiation responses during stem cell differentiation. In vivo, lack of LIN41 is associated with upregulation of Grhl3 and widespread caspase-3 activation (p53 effectors). Lin41-deficient mice display neural tube closure defects.","method":"Co-immunoprecipitation, ubiquitination assay, Lin41-inducible mouse ESCs, ubiquitin/ubiquitin-like modification proteomics, in vivo knockout analysis","journal":"Cell death and differentiation","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP, ubiquitination assay, in vivo KO with defined cellular phenotype, multiple orthogonal methods","pmids":["28430184"],"is_preprint":false},{"year":2017,"finding":"LIN-41-containing RNPs in C. elegans include essential RNA-binding proteins, the GLD-2 cytoplasmic poly(A) polymerase, the CCR4-NOT deadenylase complex, and translation initiation factors. LIN-41 represses translation of spn-4 and meg-1 mRNAs while OMA-1/2 promote their expression, defining a translational repression-to-activation switch during oocyte meiotic maturation.","method":"RNP purification, mass spectrometry protein identification, RNA sequencing of RNP-associated mRNAs, genetic analysis","journal":"Genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — biochemical RNP purification with MS identification, RNA-seq, and genetic validation","pmids":["28576864"],"is_preprint":false},{"year":2018,"finding":"C. elegans LIN-41 degradation upon meiotic maturation requires CDK-1 activity and the SCF E3 ubiquitin ligase subunit SEL-10/Fbw7/Cdc4. Two nonoverlapping protein regions (Deg-A and Deg-B) each containing phosphodegron sequences are individually necessary for LIN-41 degradation; Deg-A and Deg-B together are sufficient to confer SEL-10-dependent degradation when transplanted to a different oocyte protein.","method":"Domain deletion/transplantation experiments, CDK-1 and SEL-10 loss-of-function genetics, phosphodegron mutagenesis","journal":"Genetics","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — domain transplantation, mutagenesis of phosphodegrons, genetic epistasis with CDK-1 and SEL-10","pmids":["30206186"],"is_preprint":false},{"year":2019,"finding":"TRIM71 represses CDKN1A/p21 mRNA via direct interaction of its NHL domain with a structural RNA stem-loop motif in the CDKN1A 3'UTR. This repression is independent of miRNA-mediated silencing and instead requires the NMD factors SMG1, UPF1, and SMG7 (TRIM71/NMD axis).","method":"RNA immunoprecipitation, NHL domain binding assay, miRNA-independent reporter assay, knockdown of NMD factors, mRNA decay assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct RNA binding with domain specificity, NMD factor dependency shown by knockdown, multiple orthogonal methods","pmids":["31732746"],"is_preprint":false},{"year":2019,"finding":"The lncRNA Trincr1 binds TRIM71 in the cytoplasm and represses it, leading to downregulation of SHCBP1 protein and decreased FGF/ERK signaling in mouse ESCs. Trim71 knockdown completely rescues the defects of Trincr1 knockout, placing TRIM71 downstream of Trincr1 in the FGF/ERK regulatory pathway.","method":"RNA immunoprecipitation, Co-IP, knockout/knockdown rescue experiments, phospho-ERK western blot","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP of lncRNA-protein interaction, genetic epistasis via rescue, single lab","pmids":["30911006"],"is_preprint":false},{"year":2019,"finding":"TRIM71 functions as an E3 ubiquitin ligase for mutant p53; TRIM71 binds the transactivation domain of mutant p53 and induces its ubiquitination and proteasomal degradation, inhibiting mutant p53 GOF target gene expression.","method":"Co-immunoprecipitation, in vivo ubiquitination assay, proteasome inhibitor experiments, gene expression analysis","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with ubiquitination assay, single lab","pmids":["31570706"],"is_preprint":false},{"year":2019,"finding":"TRIM71 shapes mESC transcriptome predominantly through RNA-binding activity; it binds targets through 3'UTR hairpin motifs and acts predominantly by target mRNA degradation. TRIM71 represses MBNL1, and through MBNL1 repression promotes embryonic alternative splicing patterns. CH-associated mutations in the NHL domain impair target silencing.","method":"RNA-seq, RIP-seq, domain mutant analysis, alternative splicing analysis, functional NHL mutation characterization","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Strong — RIP-seq, RNA-seq, domain mutagenesis including disease-linked mutations, multiple orthogonal methods","pmids":["31371437"],"is_preprint":false},{"year":2021,"finding":"TRIM71 represses AGO2 mRNA translation in mouse embryonic stem cells. Blocking this repression leads to a post-transcriptional increase of mature let-7 microRNAs, resulting in let-7-dependent stemness defects and accelerated differentiation, supporting a Trim71-let-7 bistable switch model.","method":"Polysome profiling/translation assay, let-7 quantification, knockdown/rescue experiments with stemness markers","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct translational repression assay, let-7 quantification, rescue experiments, multiple orthogonal methods","pmids":["33599613"],"is_preprint":false},{"year":2021,"finding":"TRIM71 regulates let-7 activity via two independent mechanisms: (1) enhancement of pre-let-7 degradation through direct interaction with LIN28 and TUT4 (inhibiting let-7 maturation), and (2) repression of mature let-7 activity via RNA-dependent interaction with AGO2/RISC, directly binding and stabilizing let-7 targets.","method":"Co-immunoprecipitation, pre-let-7 processing assay, RISC interaction assay, RNA pulldown, transcriptomic analysis","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Strong — biochemical co-IPs, functional processing assays, RNA binding, multiple orthogonal methods","pmids":["33975917"],"is_preprint":false},{"year":2022,"finding":"TRIM71 functions as an E3 ubiquitin ligase targeting RAF1 for ubiquitin-proteasome degradation; HDLBP competes with TRIM71 for RAF1 binding and inhibits this degradation, stabilizing RAF1 and maintaining MEKK1-induced RAF1-Ser259-dependent MAPK signaling.","method":"Mass spectrometry screen, co-immunoprecipitation, ubiquitination assay, proteasome inhibitor experiments","journal":"Cellular and molecular gastroenterology and hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP competition assay, ubiquitination assay, single lab","pmids":["36244648"],"is_preprint":false},{"year":2022,"finding":"The CH-causing Trim71 R783H mutation alters mRNA substrate specificity: mutant Trim71 binds and represses translation of Lsd1 (Kdm1a) mRNA (not bound by wild-type), causing accelerated stem cell differentiation and neural lineage commitment. Specific inhibition of this Lsd1 repression or slight Lsd1 increase alleviates the defects.","method":"PAR-CLIP/RIP to identify mutant-specific targets, translation reporter assay, Lsd1 rescue experiments, neural differentiation assays","journal":"EMBO reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — target identification by RIP, translational repression assay, specific rescue of phenotype, multiple orthogonal methods","pmids":["36573342"],"is_preprint":false},{"year":2023,"finding":"Crystal structure of the mouse TRIM71 NHL domain in complex with a stem-loop RNA motif from Trincr1 lncRNA was solved; an adenosine base at the loop region is crucial for mTRIM71 interaction. Key conserved residues required for RNA binding were identified by mutagenesis; single-site mutations impair binding to hairpin RNAs in vitro and to CDKN1A and Rbl2 mRNAs in mESCs. CH-specific mutations similarly impair RNA target binding.","method":"X-ray crystallography (PDB structure), mutagenesis, in vitro RNA binding assay, RIP in mESCs","journal":"Science bulletin","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with functional mutagenesis and in-cell RIP validation, multiple orthogonal methods","pmids":["38036331"],"is_preprint":false},{"year":2023,"finding":"CH-associated mutations R595H and R783H in Trim71 are gain-of-function: each binds an ectopic and distinct repertoire of target mRNAs. R595H-Trim71, but not R783H-Trim71 or wild-type, binds β-catenin mRNA and represses its translation; increasing β-catenin specifically rescues R595H-Trim71 mESC differentiation defects, implicating distinct Wnt/β-catenin disruption by this mutation.","method":"PAR-CLIP/RIP for target identification, translation reporter assay, β-catenin overexpression/Wnt agonist rescue","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — genome-wide target identification, translational assay, specific rescue, multiple orthogonal methods","pmids":["36757932"],"is_preprint":false},{"year":2023,"finding":"TRIM71 NHL domain crystal structure (PDB: 9JUR) confirms strong and specific binding to CDKN1A mRNA (Kd = 0.42 μM by fluorescence polarization, confirmed by EMSA), establishing the structural basis for CDKN1A mRNA repression.","method":"X-ray crystallography, fluorescence polarization binding assay, EMSA","journal":"International journal of biological macromolecules","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with quantitative binding assays, single lab","pmids":["40180090"],"is_preprint":false},{"year":2023,"finding":"TRIM71 co-precipitates with IMP1 (an RNA-stabilizing protein), is capable of both positive and negative regulation of target RNAs depending on the target; deletion of the NHL domain impairs RNA binding. RNAs bound by CH-associated NHL point mutations cluster with RNAs bound by the NHL deletion mutant.","method":"RNA immunoprecipitation (RIP-seq), co-immunoprecipitation, NHL domain deletion analysis","journal":"Cell cycle (Georgetown, Tex.)","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — RIP-seq and Co-IP, domain deletion, single lab","pmids":["32816599"],"is_preprint":false},{"year":2023,"finding":"TRIM71 RNA-binding activity (NHL domain) is essential for cochlear supporting cell de-differentiation into progenitor-like cells; TRIM71 re-expression increases mitotic and hair-cell-forming potential of P5 cochlear supporting cells. TRIM71 target Hmga2 is essential for supporting cell self-renewal and hair cell formation.","method":"Organoid-based assay, domain mutant (RNA-binding-deficient TRIM71), transcriptomic analysis, Hmga2 knockdown","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific mutant with functional phenotype, target validation, single lab","pmids":["37492931"],"is_preprint":false},{"year":2023,"finding":"The glycolytic enzyme Pfkp acts as a protein kinase that phosphorylates Lin41 on serine residues, stabilizing Lin41 by impeding its autoubiquitination and proteasomal degradation; this permits Lin41-mediated mRNA destabilization of ectodermal markers to favor endodermal specification in mESCs.","method":"In vitro kinase assay (Pfkp→Lin41 phosphorylation), autoubiquitination assay, mRNA stability assay, ESC differentiation assay","journal":"EMBO reports","confidence":"Medium","confidence_rationale":"Tier 1-2 / Moderate — in vitro kinase assay, autoubiquitination assay, functional differentiation readout, single lab","pmids":["36660859"],"is_preprint":false},{"year":2024,"finding":"TRIM71 forms a protein complex with IGF2BP1, binds and stabilizes CEBPA mRNA in an m6A-dependent manner, enhancing serine/glycine metabolic pathway and promoting liver cancer progression.","method":"Co-immunoprecipitation, RIP assay, m6A inhibitor experiments, metabolic assays","journal":"Theranostics","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP, RIP, m6A dependency shown pharmacologically, single lab","pmids":["39267787"],"is_preprint":false},{"year":2024,"finding":"de novo TRIM71 NHL domain variants causing congenital hydrocephalus exhibit impaired binding to canonical target CDKN1A; other variants fail to direct subcellular localization of TRIM71 to processing bodies. Single-cell transcriptomics confirms TRIM71 expression in first-trimester neural stem cells.","method":"Functional binding assay (NHL mutants vs CDKN1A), P-body localization assay, exome sequencing with family validation, single-cell transcriptomics","journal":"Brain : a journal of neurology","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — functional binding and localization assays for disease variants, large cohort but mechanistic assays are single lab","pmids":["38833623"],"is_preprint":false},{"year":2025,"finding":"TRIM71 maintains cochlear hair cell progenitors in a proliferative/undifferentiated state by restricting TGFβ-type signaling; transcriptomic profiling of Trim71-deficient cochlear progenitor cells identifies Inhba and Tgfbr2 as TRIM71 repression targets. Loss of TRIM71 in early otic development causes premature hair cell formation.","method":"Conditional knockout mouse model, transcriptomic profiling, double-knockout genetic epistasis (Inhba-Tgfbr1 dKO)","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO with defined differentiation phenotype, transcriptomics identifying targets, genetic epistasis with pathway components","pmids":["40892928"],"is_preprint":false},{"year":2025,"finding":"TRIM71 represses Eomes mRNA (a mesodermal pioneer transcription factor) via its NHL domain; global Trim71 KO embryos display impaired primitive erythropoiesis, yolk sac vasculature defects, and strong upregulation of Eomes at gastrulation.","method":"Conditional/global knockout mouse, scRNA-seq, NHL domain binding/repression assay for Eomes mRNA","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO phenotype with scRNA-seq, direct NHL-mediated repression demonstrated, single lab","pmids":["39909558"],"is_preprint":false},{"year":2023,"finding":"C. elegans LIN-41 regulates germline mRNAs via LIN-41 Recognition Elements (LREs); cfp-1 mRNA (encoding chromatin modifier CFP-1) was identified and validated as a LRE-dependent germline target whose LIN-41-mediated repression may facilitate transcriptional reprogramming during the oocyte-to-embryo transition.","method":"Computational-experimental analysis (LRE motif prediction + experimental validation), RIP, functional assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — computational prediction with experimental RIP validation and functional assay, single lab","pmids":["37670562"],"is_preprint":false},{"year":2016,"finding":"TRIM71 ubiquitin transfer activity (E3 ligase function) is required for its tumor suppressive effects on cancer cell proliferation and invasion; overexpression of an ubiquitin transfer-deficient TRIM71 mutant has no effect on proliferation or invasion regardless of Lin28B-let-7-HMGA2 signaling status.","method":"Ubiquitin transfer-deficient mutant overexpression, cell proliferation/invasion assays, mouse tumor model","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — specific E3-dead mutant with functional readout, in vivo tumor model, single lab","pmids":["27821801"],"is_preprint":false}],"current_model":"TRIM71/LIN-41 is a conserved TRIM-NHL protein that functions as both an RNA-binding translational repressor/mRNA decay factor (via its NHL domain, which recognizes stem-loop RNA hairpin motifs) and an E3 ubiquitin ligase (via its RING domain), acting downstream of let-7 miRNA to control developmental timing, stem cell self-renewal, and cell fate: it represses key target mRNAs including CDKN1A/p21 (recruiting NMD factors), AGO2, EGR1, MBNL1, Rbl1/2, and Lin28B, thereby modulating let-7 activity through a bistable feedback loop, while also ubiquitinating substrates including AGO2, p53, mutant p53, and RAF1; its position-dependent dual silencing activity (5'UTR binding → translational repression; 3'UTR binding → mRNA decay) is regulated by CDK-1/SCF-SEL-10-mediated phosphodegron-dependent protein degradation at meiotic maturation, and by Pfkp-mediated serine phosphorylation that stabilizes it by blocking autoubiquitination."},"narrative":{"mechanistic_narrative":"TRIM71/LIN-41 is a conserved TRIM-NHL protein that controls developmental timing, stem cell self-renewal, and cell fate as a bifunctional post-transcriptional regulator, acting genetically downstream of let-7 miRNA and upstream of differentiation effectors [PMID:10882102, PMID:33599613]. Its NHL domain is necessary and sufficient for RNA target recognition, binding structured stem-loop hairpin motifs through conserved residues defined by crystal structures of the NHL domain bound to Trincr1 and CDKN1A RNA [PMID:23125361, PMID:38036331, PMID:40180090]. The position of the bound site dictates the silencing mode: 3'UTR binding drives mRNA decay while 5'UTR binding causes translational repression, a rule established by binding-site transplantation [PMID:28111013]. Through this activity TRIM71 represses a broad target set including CDKN1A/p21 — which it silences via an NMD-dependent (SMG1/UPF1/SMG7) route to promote the G1-S transition — AGO2, EGR1, Rbl1/2, MBNL1, and Hmga2, thereby reinforcing stemness and shaping the transcriptome and splicing landscape [PMID:22735451, PMID:23125361, PMID:24239284, PMID:31732746, PMID:31371437, PMID:33599613, PMID:37492931]. A second, RING-dependent E3 ubiquitin ligase activity targets AGO2, p53 and mutant p53, Lin28B, and RAF1 for ubiquitination, linking TRIM71 to let-7 biogenesis, apoptosis/differentiation control, and MAPK signaling [PMID:19898466, PMID:24602972, PMID:28430184, PMID:31570706, PMID:36244648]. TRIM71 acts on let-7 by two routes — promoting pre-let-7 degradation with LIN28/TUT4 and repressing mature let-7 via AGO2/RISC — forming a bistable feedback loop with the miRNA [PMID:33599613, PMID:33975917]. TRIM71 abundance is itself controlled by CDK-1/SCF-SEL-10 phosphodegron-dependent degradation during meiotic maturation and by Pfkp-mediated serine phosphorylation that blocks autoubiquitination [PMID:30206186, PMID:36660859]. De novo NHL-domain variants cause congenital hydrocephalus by altering RNA substrate specificity — gain-of-function mutants such as R595H and R783H bind ectopic targets (β-catenin, Lsd1) and impair CDKN1A binding and P-body localization [PMID:36573342, PMID:36757932, PMID:38833623].","teleology":[{"year":2000,"claim":"Established the genetic placement of LIN-41 in the heterochronic pathway, defining it as the developmental-timing effector acting downstream of let-7 and upstream of LIN-29.","evidence":"Genetic epistasis and GFP reporter imaging in C. elegans","pmids":["10882102"],"confidence":"High","gaps":["Did not show direct miRNA-target binding","Molecular activity of LIN-41 protein unknown at this stage"]},{"year":2004,"claim":"Demonstrated direct let-7 binding to the lin-41 3'UTR through two complementary sites, providing the biochemical basis for the genetic repression.","evidence":"In vitro RNA binding, in vivo compensatory mutagenesis, luciferase reporters","pmids":["14729570"],"confidence":"High","gaps":["Structural basis of the interaction not resolved","Did not address LIN-41's own activity as a regulator"]},{"year":2008,"claim":"Resolved the structural basis of the let-7:lin-41 interaction at LCS2 and LCS1, revealing non-canonical stem-loop features.","evidence":"NMR solution structures of the miRNA:mRNA complexes","pmids":["18296482","20660479"],"confidence":"High","gaps":["Structures describe the miRNA-target duplex, not TRIM71 protein-RNA recognition","Functional consequence of conformational differences not tested"]},{"year":2009,"claim":"Revealed that LIN41 is itself an E3 ubiquitin ligase that ubiquitinates AGO2 and localizes to P-bodies, recasting it from a passive miRNA target into an active regulator of the miRNA machinery.","evidence":"In vitro ubiquitylation, reciprocal co-IP, P-body colocalization, gain/loss-of-function western blot in mouse","pmids":["19898466"],"confidence":"High","gaps":["Did not establish RNA-binding/repressor activity","Physiological ubiquitination substrate scope unknown"]},{"year":2012,"claim":"Separated TRIM71's two activities, showing the NHL domain mediates RNA binding/repression while the RING domain is dispensable for mRNA silencing, and linked CDKN1A repression to ESC cell-cycle progression.","evidence":"Domain-deletion mutagenesis, reporter repression, mRNA decay assays, KD/rescue with cell cycle analysis (two studies)","pmids":["22735451","23125361"],"confidence":"High","gaps":["RNA motif recognized by NHL not yet defined","Mechanism of decay vs translational repression unresolved"]},{"year":2013,"claim":"Extended the repressor role to reprogramming, identifying EGR1 as a translationally repressed target within the let-7/LIN-41 axis.","evidence":"mRNA binding and translational reporter assays during reprogramming","pmids":["24239284"],"confidence":"Medium","gaps":["Single lab","Direct binding motif on EGR1 not mapped"]},{"year":2014,"claim":"Defined germline and reprogramming roles: LIN-41 controls oocyte meiotic maturation via translational repression, ubiquitinates Lin28B to promote let-7, and uses distinct mechanisms in soma vs germline.","evidence":"C. elegans null/domain mutants, immunofluorescence, epistasis; human Co-IP, in vivo ubiquitination, domain mapping","pmids":["25261698","24602972","25167051"],"confidence":"High","gaps":["Molecular basis of germline-vs-soma mechanistic divergence unresolved","Lin28B ubiquitination findings single lab"]},{"year":2017,"claim":"Established the position-dependent silencing rule and the in vivo RNP composition, and added p53 ubiquitination as a route by which TRIM71 antagonizes apoptosis/differentiation.","evidence":"Ribosome profiling, RIP, binding-site transplantation; RNP purification with MS; Co-IP, ubiquitination, mouse KO with neural tube phenotype","pmids":["28111013","28576864","28430184"],"confidence":"High","gaps":["How site position is mechanistically read out by effectors not fully defined","p53 ubiquitination substrate determinants partially characterized"]},{"year":2018,"claim":"Defined the SCF-SEL-10/CDK-1 phosphodegron pathway controlling LIN-41 turnover, explaining how its activity is temporally switched off at meiotic maturation.","evidence":"Phosphodegron mutagenesis and domain transplantation, CDK-1/SEL-10 genetics in C. elegans","pmids":["30206186"],"confidence":"High","gaps":["Direct kinase phosphorylating the degrons not identified in this work","Conservation of this degron control in mammals untested here"]},{"year":2019,"claim":"Demonstrated that NHL recognizes structured 3'UTR hairpins to drive decay genome-wide, that CDKN1A repression operates through an NMD (SMG1/UPF1/SMG7) axis independent of miRNAs, and connected TRIM71 to splicing (MBNL1), FGF/ERK (Trincr1/SHCBP1), and mutant p53 degradation.","evidence":"RIP-seq/RNA-seq, NHL domain assays, NMD-factor knockdown, lncRNA Co-IP/rescue, mutant-p53 ubiquitination","pmids":["31732746","31371437","30911006","31570706"],"confidence":"High","gaps":["How NMD machinery is recruited by TRIM71 not structurally defined","Trincr1 and mutant-p53 findings single lab"]},{"year":2021,"claim":"Resolved the dual mechanism by which TRIM71 controls let-7: translational repression of AGO2 mRNA plus LIN28/TUT4-dependent pre-let-7 degradation and RISC-dependent target stabilization, supporting a bistable switch.","evidence":"Polysome profiling, let-7 quantification, pre-let-7 processing and RISC interaction assays, rescue (two studies)","pmids":["33599613","33975917"],"confidence":"High","gaps":["Quantitative thresholds of the bistable switch not modeled experimentally","Interplay between the two let-7 routes in vivo unresolved"]},{"year":2022,"claim":"Expanded the ligase substrate set to RAF1 and showed substrate access is competed by HDLBP, linking TRIM71 to MAPK signaling control, alongside Pfkp-mediated stabilizing phosphorylation.","evidence":"MS screen, Co-IP competition, ubiquitination/proteasome assays; in vitro kinase and autoubiquitination assays","pmids":["36244648","36660859"],"confidence":"Medium","gaps":["Single-lab biochemistry for each","In vivo relevance of HDLBP competition and Pfkp phosphorylation not genetically established"]},{"year":2023,"claim":"Provided crystal structures of the NHL domain bound to RNA, defined the determinants of motif recognition, and showed that congenital-hydrocephalus mutations are gain-of-function that retarget TRIM71 to ectopic mRNAs (β-catenin, Lsd1) while impairing canonical CDKN1A binding.","evidence":"X-ray crystallography with mutagenesis and RIP; PAR-CLIP/RIP target ID, translation reporters, target-specific rescue; IMP1 Co-IP/RIP-seq; cochlear organoid domain mutants","pmids":["38036331","40180090","36573342","36757932","32816599","37492931","37670562"],"confidence":"High","gaps":["Structure of the RING/E3 module and its substrate engagement not solved","How single NHL substitutions create new specificities mechanistically unresolved"]},{"year":2024,"claim":"Linked TRIM71 NHL variants causally to human congenital hydrocephalus via impaired CDKN1A binding and disrupted P-body localization, and identified an m6A/IGF2BP1-dependent mRNA-stabilizing role in liver cancer.","evidence":"Exome sequencing with family validation, functional binding/localization assays, single-cell transcriptomics; Co-IP, RIP, m6A pharmacology","pmids":["38833623","39267787"],"confidence":"Medium","gaps":["m6A-dependent stabilization mechanism single lab","How loss-of-binding vs gain-of-function variants converge on the same disease unresolved"]},{"year":2025,"claim":"Defined developmental in vivo target programs: TRIM71 restricts TGFβ-type signaling (Inhba/Tgfbr2) to maintain cochlear progenitors and represses Eomes to permit proper gastrulation and primitive erythropoiesis.","evidence":"Conditional/global KO mice, scRNA-seq, NHL repression assays, genetic epistasis","pmids":["40892928","39909558"],"confidence":"High","gaps":["Eomes findings single lab","Relative contribution of decay vs translational repression for these targets in vivo not dissected"]},{"year":null,"claim":"How TRIM71's RNA-binding and E3-ligase activities are coordinated on shared substrates (e.g., AGO2 mRNA vs AGO2 protein), and how its abundance and substrate specificity are integrated by upstream signals across tissues, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of full-length TRIM71 or its RING-substrate complexes","Mechanism switching between mRNA stabilization and repression not defined","Integration of phosphorylation, degron control, and lncRNA inhibition in vivo unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[6,11,15,18,19,23,25]},{"term_id":"GO:0016874","term_label":"ligase activity","supporting_discovery_ids":[4,8,12,17,21,34]},{"term_id":"GO:0140096","term_label":"catalytic activity, acting on a protein","supporting_discovery_ids":[4,8,12,17,21]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[6,7,11,19,22]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[6,11,15,18]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[4,16]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[4,5,30]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[11,15,18,19,20]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[4,8,12,17,21]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[0,9,27,31,32]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[5,15]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[16,21,24,31]}],"complexes":["RISC (TRIM71-AGO2 RNP)","P-body"],"partners":["AGO2","LIN28B","TUT4","RAF1","P53","IGF2BP1","IMP1","HDLBP"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q2Q1W2","full_name":"E3 ubiquitin-protein ligase TRIM71","aliases":["Protein lin-41 homolog","RING-type E3 ubiquitin transferase TRIM71","Tripartite motif-containing protein 71"],"length_aa":868,"mass_kda":93.4,"function":"E3 ubiquitin-protein ligase that cooperates with the microRNAs (miRNAs) machinery and promotes embryonic stem cells proliferation and maintenance (Probable). Binds to miRNAs and associates with AGO2, participating in post-transcriptional repression of transcripts such as CDKN1A (By similarity). In addition, participates in post-transcriptional mRNA repression in a miRNA independent mechanism (PubMed:23125361). Facilitates the G1-S transition to promote rapid embryonic stem cell self-renewal by repressing CDKN1A expression. Required to maintain proliferation and prevent premature differentiation of neural progenitor cells during early neural development: positively regulates FGF signaling by controlling the stability of SHCBP1 (By similarity). Specific regulator of miRNA biogenesis. Binds to miRNA MIR29A hairpin and postranscriptionally modulates MIR29A levels, which indirectly regulates TET proteins expression (PubMed:28431233)","subcellular_location":"Cytoplasm, P-body","url":"https://www.uniprot.org/uniprotkb/Q2Q1W2/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/TRIM71","classification":"Not Classified","n_dependent_lines":19,"n_total_lines":1208,"dependency_fraction":0.015728476821192054},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"ATP2B1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/TRIM71","total_profiled":1310},"omim":[{"mim_id":"618667","title":"HYDROCEPHALUS, CONGENITAL, 4; HYC4","url":"https://www.omim.org/entry/618667"},{"mim_id":"618570","title":"TRIPARTITE MOTIF-CONTAINING PROTEIN 71; TRIM71","url":"https://www.omim.org/entry/618570"},{"mim_id":"616659","title":"TBC1 DOMAIN FAMILY, MEMBER 17; TBC1D17","url":"https://www.omim.org/entry/616659"},{"mim_id":"236600","title":"HYDROCEPHALUS, CONGENITAL, 1; HYC1","url":"https://www.omim.org/entry/236600"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Plasma membrane","reliability":"Approved"},{"location":"Actin filaments","reliability":"Approved"},{"location":"Focal adhesion sites","reliability":"Approved"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in 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medicine","url":"https://pubmed.ncbi.nlm.nih.gov/40398685","citation_count":3,"is_preprint":false},{"pmid":"36757939","id":"PMC_36757939","title":"Gain-of-function mutations in Trim71 linked to congenital hydrocephalus.","date":"2023","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/36757939","citation_count":3,"is_preprint":false},{"pmid":"39909558","id":"PMC_39909558","title":"Impaired primitive erythropoiesis and defective vascular development in Trim71-KO embryos.","date":"2025","source":"Life science alliance","url":"https://pubmed.ncbi.nlm.nih.gov/39909558","citation_count":2,"is_preprint":false},{"pmid":"37670562","id":"PMC_37670562","title":"Post-transcriptional repression of CFP-1 expands the regulatory repertoire of LIN-41/TRIM71.","date":"2023","source":"Nucleic acids research","url":"https://pubmed.ncbi.nlm.nih.gov/37670562","citation_count":2,"is_preprint":false},{"pmid":"35622497","id":"PMC_35622497","title":"Brain-wide identification of LIN-41 (TRIM71) protein-expressing neurons by NeuroPAL.","date":"2021","source":"microPublication biology","url":"https://pubmed.ncbi.nlm.nih.gov/35622497","citation_count":2,"is_preprint":false},{"pmid":"39522935","id":"PMC_39522935","title":"Mitochondrial E3 ligase TRIM71 affects mitochondrial complex assembly and sensitizes dopaminergic neuronal cells to apoptosis in Parkinson's Disease (PD).","date":"2024","source":"The international journal of biochemistry & cell biology","url":"https://pubmed.ncbi.nlm.nih.gov/39522935","citation_count":2,"is_preprint":false},{"pmid":"40892928","id":"PMC_40892928","title":"The RNA-binding protein TRIM71 is essential for hearing in humans and mice and times auditory sensory organ development.","date":"2025","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/40892928","citation_count":1,"is_preprint":false},{"pmid":"33901606","id":"PMC_33901606","title":"Methylglyoxal influences development of Caenorhabditis elegans via lin-41-dependent pathway.","date":"2021","source":"Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association","url":"https://pubmed.ncbi.nlm.nih.gov/33901606","citation_count":1,"is_preprint":false},{"pmid":"28157501","id":"PMC_28157501","title":"When LIN41 Comes to a Fork in the Road, It Takes BOTH Paths: Translational Repression OR mRNA Decay, Depending on the Target Site Position.","date":"2017","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/28157501","citation_count":1,"is_preprint":false},{"pmid":"40180090","id":"PMC_40180090","title":"Human tripartite motif-containing protein 71 NCL-1/HT2A/LIN-41 domain crystal structure and its potential natural inhibitors.","date":"2025","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/40180090","citation_count":1,"is_preprint":false},{"pmid":"40501610","id":"PMC_40501610","title":"The RNA-binding protein TRIM71 is essential for hearing in humans and mice and regulates the timing of auditory sensory organ development.","date":"2025","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/40501610","citation_count":0,"is_preprint":false},{"pmid":"36711735","id":"PMC_36711735","title":"Reactivation of the progenitor gene Trim71 enhances the mitotic and hair cell-forming potential of cochlear supporting cells.","date":"2023","source":"bioRxiv : the preprint server for biology","url":"https://pubmed.ncbi.nlm.nih.gov/36711735","citation_count":0,"is_preprint":false},{"pmid":"39116200","id":"PMC_39116200","title":"Protocol for differential analysis of Trim71-associated protein complexes in mouse embryonic stem cells by mass spectrometry using Perseus.","date":"2024","source":"STAR 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elegans\".","date":"2018","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/29967060","citation_count":0,"is_preprint":false},{"pmid":"42177918","id":"PMC_42177918","title":"West Nile Virus inhibits type I interferon response via TRIM71 in human microglial cells.","date":"2026","source":"Antiviral research","url":"https://pubmed.ncbi.nlm.nih.gov/42177918","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2024.12.03.24318397","title":"Multi-omic analysis identifies a multi-step pathology in a case of multiple chorangioma syndrome in monochorionic twins","date":"2024-12-05","source":"bioRxiv","url":"https://doi.org/10.1101/2024.12.03.24318397","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.08.03.606500","title":"Synergistic control of axon regeneration and functional recovery by  <i>let-7</i>  miRNA and Insulin signalling (IIs) pathways","date":"2024-08-06","source":"bioRxiv","url":"https://doi.org/10.1101/2024.08.03.606500","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":31802,"output_tokens":8267,"usd":0.109705,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18025,"output_tokens":5287,"usd":0.11115,"stage2_stop_reason":"end_turn"},"total_usd":0.220855,"stage1_batch_id":"msgbatch_017qqVz33Ga63SCDwzb35XPb","stage2_batch_id":"msgbatch_01Scr2Ei9x4HJMiRGxwrmvLK","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2000,\n      \"finding\": \"C. elegans LIN-41 acts in the heterochronic pathway downstream of let-7 miRNA and upstream of LIN-29 transcription factor; let-7 mutations cause reiterated heterochronic phenotypes that are suppressed by lin-41 mutations, establishing genetic epistasis. A lin-41::GFP fusion is downregulated at the time let-7 is upregulated, and the lin-41 3'UTR contains two elements complementary to let-7.\",\n      \"method\": \"Genetic epistasis (suppressor screen, double-mutant analysis), GFP reporter fusion imaging\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal genetic epistasis with multiple alleles, replicated across labs, foundational paper\",\n      \"pmids\": [\"10882102\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"let-7 miRNA directly binds the lin-41 3'UTR in vitro via two conserved let-7 complementary sites (LCS1 and LCS2); compensatory mutations in LCS sites that match the let-7(n2853) lesion partially restore lin-41 3'UTR function in vivo, providing direct experimental evidence for miRNA-target binding.\",\n      \"method\": \"In vitro RNA-binding assay, compensatory mutation analysis in vivo, luciferase reporter assay\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro binding plus in vivo compensatory mutagenesis, replicated concept\",\n      \"pmids\": [\"14729570\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"NMR solution structure of the let-7 miRNA:lin-41 mRNA complex at LCS2 reveals a stem-loop with two stem regions separated by an asymmetric internal loop; three uracils form a base triple and two adenines form a base pair in the internal loop, defining structural basis of miRNA-target interaction.\",\n      \"method\": \"NMR spectroscopy with NOE restraints, torsion angle restraints, and residual dipolar couplings\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution NMR structure with functional restraints, single lab\",\n      \"pmids\": [\"18296482\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NMR solution structure of the let-7:lin-41 complex at LCS1 reveals a stem-loop with non-canonical structural elements (asymmetric internal loop, adenine bulge) within the seed region; comparison with LCS2 structure shows conformational differences correlating with distinct bending between stems.\",\n      \"method\": \"NMR spectroscopy (solution-state)\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — independent NMR structure complementing LCS2 structure from same lab, structural validation\",\n      \"pmids\": [\"20660479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Mouse LIN41 (mLin41) acts as an E3 ubiquitin ligase that mediates ubiquitylation of AGO2 in vitro and in vivo; mLin41 interacts with Dicer and Argonaute proteins (Ago1, Ago2, Ago4) via co-precipitation; it colocalizes with P-body markers, Ago2, Mov10, and Tnrc6b in cytoplasmic foci. Overexpression/depletion of mLin41 inversely changes Ago2 protein levels, implicating mLin41 in Ago2 turnover. mLin41 cooperates with Lin-28 to suppress let-7 activity.\",\n      \"method\": \"In vitro ubiquitylation assay, co-immunoprecipitation, immunofluorescence colocalization, overexpression/knockdown with western blot\",\n      \"journal\": \"Nature cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — in vitro reconstitution of E3 ligase activity plus reciprocal co-IPs plus functional overexpression/depletion, replicated by multiple subsequent studies\",\n      \"pmids\": [\"19898466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRIM71 associates with AGO2 and microRNAs and represses expression of CDKN1A (p21), a CDK inhibitor; this repression requires the RING domain and specific protein domains for P-body localization. TRIM71 knockdown prolongs G1 phase and slows ESC proliferation, phenotype rescued by CDKN1A depletion, demonstrating TRIM71 promotes G1-S transition via CDKN1A repression.\",\n      \"method\": \"Co-immunoprecipitation, reporter mRNA repression assay, knockdown/rescue experiments, cell cycle analysis (FACS), P-body localization by immunofluorescence\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal Co-IP, clean KD with defined phenotype, epistatic rescue, multiple orthogonal methods\",\n      \"pmids\": [\"22735451\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"TRIM71 promotes translational repression and mRNA decay; the NHL domain is necessary and sufficient to target TRIM71 to RNA, while the RING domain (ubiquitin ligase activity) is dispensable for mRNA repression. Rbl1 and Rbl2 are identified as TRIM71 target mRNAs in mouse ESCs.\",\n      \"method\": \"RNA-association assays, translational repression reporter assays, domain deletion mutagenesis, mRNA decay assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — mutagenesis separating RNA-binding from ubiquitin ligase activity, multiple orthogonal assays, single lab\",\n      \"pmids\": [\"23125361\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"LIN-41 inhibits translation of EGR1 mRNA through binding its cognate mRNA, as part of a let-7/LIN-41 pathway that controls reprogramming; LIN41 regulates a broad array of differentiation genes post-transcriptionally.\",\n      \"method\": \"Mechanistic studies including mRNA binding assays and translational reporter analysis, knockdown/overexpression during reprogramming\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — functional knockdown/OE with pathway placement and specific translational target identified, single lab\",\n      \"pmids\": [\"24239284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Human TRIM71 ubiquitinates Lin28B and promotes its proteasomal degradation; the N-terminal RING finger motif of TRIM71 is critical for Lin28B interaction and polyubiquitination. The C-terminal ~50 amino acid stretch unique to Lin28B (vs Lin28A) is essential for TRIM71 interaction. TRIM71-mediated Lin28B degradation consequently promotes let-7 expression.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, knockdown experiments, domain mapping/mutagenesis\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with domain mapping, in vivo ubiquitination assay, single lab\",\n      \"pmids\": [\"24602972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"C. elegans LIN-41 is a translational repressor that controls oocyte growth and meiotic maturation; lin-41 null mutants display premature pachytene cellularization, CDK-1 activation, M-phase entry, and spindle assembly. Translational derepression of CDC-25.3 (CDK-1 activator) contributes to premature M-phase entry. LIN-41 and OMA-1/2 have an antagonistic relationship controlling meiotic maturation.\",\n      \"method\": \"Genetic null mutant analysis, immunofluorescence (spindle assembly), genetic epistasis\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — null mutant with defined cellular phenotype, epistasis with OMA proteins, replicated across multiple papers\",\n      \"pmids\": [\"25261698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"C. elegans LIN-41 controls onset of developmental plasticity in the germline; LIN-41 is expressed in oocyte cytoplasm and mutations in its predicted RNA-association domain have only minor germline effects (unlike somatic effects), suggesting LIN-41 functions via different molecular mechanisms in germline vs soma.\",\n      \"method\": \"Structure-function analysis with domain mutations, genetic screens, oocyte phenotype analysis\",\n      \"journal\": \"PLoS genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mutagenesis with functional phenotypic readout, single lab\",\n      \"pmids\": [\"25167051\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"C. elegans LIN41 has two distinct mRNA-silencing activities determined by binding site position: 3'UTR binding leads to mRNA decay of targets mab-10, mab-3, and dmd-3, while 5'UTR binding of the lin-29A isoform causes translational repression. Binding site transplantation experiments demonstrated that the location of the LIN41 binding site specifies the silencing mechanism.\",\n      \"method\": \"Genome-wide ribosome profiling, RNA immunoprecipitation, in vitro binding, binding site transplantation experiments\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods including ribosome profiling, RIP, and mechanistic transplantation experiments\",\n      \"pmids\": [\"28111013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LIN41/TRIM71 interacts with p53, controls p53 abundance by ubiquitination, and antagonizes p53-dependent pro-apoptotic and pro-differentiation responses during stem cell differentiation. In vivo, lack of LIN41 is associated with upregulation of Grhl3 and widespread caspase-3 activation (p53 effectors). Lin41-deficient mice display neural tube closure defects.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, Lin41-inducible mouse ESCs, ubiquitin/ubiquitin-like modification proteomics, in vivo knockout analysis\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP, ubiquitination assay, in vivo KO with defined cellular phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"28430184\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"LIN-41-containing RNPs in C. elegans include essential RNA-binding proteins, the GLD-2 cytoplasmic poly(A) polymerase, the CCR4-NOT deadenylase complex, and translation initiation factors. LIN-41 represses translation of spn-4 and meg-1 mRNAs while OMA-1/2 promote their expression, defining a translational repression-to-activation switch during oocyte meiotic maturation.\",\n      \"method\": \"RNP purification, mass spectrometry protein identification, RNA sequencing of RNP-associated mRNAs, genetic analysis\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — biochemical RNP purification with MS identification, RNA-seq, and genetic validation\",\n      \"pmids\": [\"28576864\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"C. elegans LIN-41 degradation upon meiotic maturation requires CDK-1 activity and the SCF E3 ubiquitin ligase subunit SEL-10/Fbw7/Cdc4. Two nonoverlapping protein regions (Deg-A and Deg-B) each containing phosphodegron sequences are individually necessary for LIN-41 degradation; Deg-A and Deg-B together are sufficient to confer SEL-10-dependent degradation when transplanted to a different oocyte protein.\",\n      \"method\": \"Domain deletion/transplantation experiments, CDK-1 and SEL-10 loss-of-function genetics, phosphodegron mutagenesis\",\n      \"journal\": \"Genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — domain transplantation, mutagenesis of phosphodegrons, genetic epistasis with CDK-1 and SEL-10\",\n      \"pmids\": [\"30206186\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM71 represses CDKN1A/p21 mRNA via direct interaction of its NHL domain with a structural RNA stem-loop motif in the CDKN1A 3'UTR. This repression is independent of miRNA-mediated silencing and instead requires the NMD factors SMG1, UPF1, and SMG7 (TRIM71/NMD axis).\",\n      \"method\": \"RNA immunoprecipitation, NHL domain binding assay, miRNA-independent reporter assay, knockdown of NMD factors, mRNA decay assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct RNA binding with domain specificity, NMD factor dependency shown by knockdown, multiple orthogonal methods\",\n      \"pmids\": [\"31732746\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The lncRNA Trincr1 binds TRIM71 in the cytoplasm and represses it, leading to downregulation of SHCBP1 protein and decreased FGF/ERK signaling in mouse ESCs. Trim71 knockdown completely rescues the defects of Trincr1 knockout, placing TRIM71 downstream of Trincr1 in the FGF/ERK regulatory pathway.\",\n      \"method\": \"RNA immunoprecipitation, Co-IP, knockout/knockdown rescue experiments, phospho-ERK western blot\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP of lncRNA-protein interaction, genetic epistasis via rescue, single lab\",\n      \"pmids\": [\"30911006\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM71 functions as an E3 ubiquitin ligase for mutant p53; TRIM71 binds the transactivation domain of mutant p53 and induces its ubiquitination and proteasomal degradation, inhibiting mutant p53 GOF target gene expression.\",\n      \"method\": \"Co-immunoprecipitation, in vivo ubiquitination assay, proteasome inhibitor experiments, gene expression analysis\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with ubiquitination assay, single lab\",\n      \"pmids\": [\"31570706\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM71 shapes mESC transcriptome predominantly through RNA-binding activity; it binds targets through 3'UTR hairpin motifs and acts predominantly by target mRNA degradation. TRIM71 represses MBNL1, and through MBNL1 repression promotes embryonic alternative splicing patterns. CH-associated mutations in the NHL domain impair target silencing.\",\n      \"method\": \"RNA-seq, RIP-seq, domain mutant analysis, alternative splicing analysis, functional NHL mutation characterization\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — RIP-seq, RNA-seq, domain mutagenesis including disease-linked mutations, multiple orthogonal methods\",\n      \"pmids\": [\"31371437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM71 represses AGO2 mRNA translation in mouse embryonic stem cells. Blocking this repression leads to a post-transcriptional increase of mature let-7 microRNAs, resulting in let-7-dependent stemness defects and accelerated differentiation, supporting a Trim71-let-7 bistable switch model.\",\n      \"method\": \"Polysome profiling/translation assay, let-7 quantification, knockdown/rescue experiments with stemness markers\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct translational repression assay, let-7 quantification, rescue experiments, multiple orthogonal methods\",\n      \"pmids\": [\"33599613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"TRIM71 regulates let-7 activity via two independent mechanisms: (1) enhancement of pre-let-7 degradation through direct interaction with LIN28 and TUT4 (inhibiting let-7 maturation), and (2) repression of mature let-7 activity via RNA-dependent interaction with AGO2/RISC, directly binding and stabilizing let-7 targets.\",\n      \"method\": \"Co-immunoprecipitation, pre-let-7 processing assay, RISC interaction assay, RNA pulldown, transcriptomic analysis\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — biochemical co-IPs, functional processing assays, RNA binding, multiple orthogonal methods\",\n      \"pmids\": [\"33975917\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"TRIM71 functions as an E3 ubiquitin ligase targeting RAF1 for ubiquitin-proteasome degradation; HDLBP competes with TRIM71 for RAF1 binding and inhibits this degradation, stabilizing RAF1 and maintaining MEKK1-induced RAF1-Ser259-dependent MAPK signaling.\",\n      \"method\": \"Mass spectrometry screen, co-immunoprecipitation, ubiquitination assay, proteasome inhibitor experiments\",\n      \"journal\": \"Cellular and molecular gastroenterology and hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP competition assay, ubiquitination assay, single lab\",\n      \"pmids\": [\"36244648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The CH-causing Trim71 R783H mutation alters mRNA substrate specificity: mutant Trim71 binds and represses translation of Lsd1 (Kdm1a) mRNA (not bound by wild-type), causing accelerated stem cell differentiation and neural lineage commitment. Specific inhibition of this Lsd1 repression or slight Lsd1 increase alleviates the defects.\",\n      \"method\": \"PAR-CLIP/RIP to identify mutant-specific targets, translation reporter assay, Lsd1 rescue experiments, neural differentiation assays\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — target identification by RIP, translational repression assay, specific rescue of phenotype, multiple orthogonal methods\",\n      \"pmids\": [\"36573342\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Crystal structure of the mouse TRIM71 NHL domain in complex with a stem-loop RNA motif from Trincr1 lncRNA was solved; an adenosine base at the loop region is crucial for mTRIM71 interaction. Key conserved residues required for RNA binding were identified by mutagenesis; single-site mutations impair binding to hairpin RNAs in vitro and to CDKN1A and Rbl2 mRNAs in mESCs. CH-specific mutations similarly impair RNA target binding.\",\n      \"method\": \"X-ray crystallography (PDB structure), mutagenesis, in vitro RNA binding assay, RIP in mESCs\",\n      \"journal\": \"Science bulletin\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with functional mutagenesis and in-cell RIP validation, multiple orthogonal methods\",\n      \"pmids\": [\"38036331\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CH-associated mutations R595H and R783H in Trim71 are gain-of-function: each binds an ectopic and distinct repertoire of target mRNAs. R595H-Trim71, but not R783H-Trim71 or wild-type, binds β-catenin mRNA and represses its translation; increasing β-catenin specifically rescues R595H-Trim71 mESC differentiation defects, implicating distinct Wnt/β-catenin disruption by this mutation.\",\n      \"method\": \"PAR-CLIP/RIP for target identification, translation reporter assay, β-catenin overexpression/Wnt agonist rescue\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genome-wide target identification, translational assay, specific rescue, multiple orthogonal methods\",\n      \"pmids\": [\"36757932\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM71 NHL domain crystal structure (PDB: 9JUR) confirms strong and specific binding to CDKN1A mRNA (Kd = 0.42 μM by fluorescence polarization, confirmed by EMSA), establishing the structural basis for CDKN1A mRNA repression.\",\n      \"method\": \"X-ray crystallography, fluorescence polarization binding assay, EMSA\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with quantitative binding assays, single lab\",\n      \"pmids\": [\"40180090\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM71 co-precipitates with IMP1 (an RNA-stabilizing protein), is capable of both positive and negative regulation of target RNAs depending on the target; deletion of the NHL domain impairs RNA binding. RNAs bound by CH-associated NHL point mutations cluster with RNAs bound by the NHL deletion mutant.\",\n      \"method\": \"RNA immunoprecipitation (RIP-seq), co-immunoprecipitation, NHL domain deletion analysis\",\n      \"journal\": \"Cell cycle (Georgetown, Tex.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — RIP-seq and Co-IP, domain deletion, single lab\",\n      \"pmids\": [\"32816599\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"TRIM71 RNA-binding activity (NHL domain) is essential for cochlear supporting cell de-differentiation into progenitor-like cells; TRIM71 re-expression increases mitotic and hair-cell-forming potential of P5 cochlear supporting cells. TRIM71 target Hmga2 is essential for supporting cell self-renewal and hair cell formation.\",\n      \"method\": \"Organoid-based assay, domain mutant (RNA-binding-deficient TRIM71), transcriptomic analysis, Hmga2 knockdown\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific mutant with functional phenotype, target validation, single lab\",\n      \"pmids\": [\"37492931\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"The glycolytic enzyme Pfkp acts as a protein kinase that phosphorylates Lin41 on serine residues, stabilizing Lin41 by impeding its autoubiquitination and proteasomal degradation; this permits Lin41-mediated mRNA destabilization of ectodermal markers to favor endodermal specification in mESCs.\",\n      \"method\": \"In vitro kinase assay (Pfkp→Lin41 phosphorylation), autoubiquitination assay, mRNA stability assay, ESC differentiation assay\",\n      \"journal\": \"EMBO reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro kinase assay, autoubiquitination assay, functional differentiation readout, single lab\",\n      \"pmids\": [\"36660859\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"TRIM71 forms a protein complex with IGF2BP1, binds and stabilizes CEBPA mRNA in an m6A-dependent manner, enhancing serine/glycine metabolic pathway and promoting liver cancer progression.\",\n      \"method\": \"Co-immunoprecipitation, RIP assay, m6A inhibitor experiments, metabolic assays\",\n      \"journal\": \"Theranostics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP, RIP, m6A dependency shown pharmacologically, single lab\",\n      \"pmids\": [\"39267787\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"de novo TRIM71 NHL domain variants causing congenital hydrocephalus exhibit impaired binding to canonical target CDKN1A; other variants fail to direct subcellular localization of TRIM71 to processing bodies. Single-cell transcriptomics confirms TRIM71 expression in first-trimester neural stem cells.\",\n      \"method\": \"Functional binding assay (NHL mutants vs CDKN1A), P-body localization assay, exome sequencing with family validation, single-cell transcriptomics\",\n      \"journal\": \"Brain : a journal of neurology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — functional binding and localization assays for disease variants, large cohort but mechanistic assays are single lab\",\n      \"pmids\": [\"38833623\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM71 maintains cochlear hair cell progenitors in a proliferative/undifferentiated state by restricting TGFβ-type signaling; transcriptomic profiling of Trim71-deficient cochlear progenitor cells identifies Inhba and Tgfbr2 as TRIM71 repression targets. Loss of TRIM71 in early otic development causes premature hair cell formation.\",\n      \"method\": \"Conditional knockout mouse model, transcriptomic profiling, double-knockout genetic epistasis (Inhba-Tgfbr1 dKO)\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO with defined differentiation phenotype, transcriptomics identifying targets, genetic epistasis with pathway components\",\n      \"pmids\": [\"40892928\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"TRIM71 represses Eomes mRNA (a mesodermal pioneer transcription factor) via its NHL domain; global Trim71 KO embryos display impaired primitive erythropoiesis, yolk sac vasculature defects, and strong upregulation of Eomes at gastrulation.\",\n      \"method\": \"Conditional/global knockout mouse, scRNA-seq, NHL domain binding/repression assay for Eomes mRNA\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO phenotype with scRNA-seq, direct NHL-mediated repression demonstrated, single lab\",\n      \"pmids\": [\"39909558\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"C. elegans LIN-41 regulates germline mRNAs via LIN-41 Recognition Elements (LREs); cfp-1 mRNA (encoding chromatin modifier CFP-1) was identified and validated as a LRE-dependent germline target whose LIN-41-mediated repression may facilitate transcriptional reprogramming during the oocyte-to-embryo transition.\",\n      \"method\": \"Computational-experimental analysis (LRE motif prediction + experimental validation), RIP, functional assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — computational prediction with experimental RIP validation and functional assay, single lab\",\n      \"pmids\": [\"37670562\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"TRIM71 ubiquitin transfer activity (E3 ligase function) is required for its tumor suppressive effects on cancer cell proliferation and invasion; overexpression of an ubiquitin transfer-deficient TRIM71 mutant has no effect on proliferation or invasion regardless of Lin28B-let-7-HMGA2 signaling status.\",\n      \"method\": \"Ubiquitin transfer-deficient mutant overexpression, cell proliferation/invasion assays, mouse tumor model\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — specific E3-dead mutant with functional readout, in vivo tumor model, single lab\",\n      \"pmids\": [\"27821801\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"TRIM71/LIN-41 is a conserved TRIM-NHL protein that functions as both an RNA-binding translational repressor/mRNA decay factor (via its NHL domain, which recognizes stem-loop RNA hairpin motifs) and an E3 ubiquitin ligase (via its RING domain), acting downstream of let-7 miRNA to control developmental timing, stem cell self-renewal, and cell fate: it represses key target mRNAs including CDKN1A/p21 (recruiting NMD factors), AGO2, EGR1, MBNL1, Rbl1/2, and Lin28B, thereby modulating let-7 activity through a bistable feedback loop, while also ubiquitinating substrates including AGO2, p53, mutant p53, and RAF1; its position-dependent dual silencing activity (5'UTR binding → translational repression; 3'UTR binding → mRNA decay) is regulated by CDK-1/SCF-SEL-10-mediated phosphodegron-dependent protein degradation at meiotic maturation, and by Pfkp-mediated serine phosphorylation that stabilizes it by blocking autoubiquitination.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"TRIM71/LIN-41 is a conserved TRIM-NHL protein that controls developmental timing, stem cell self-renewal, and cell fate as a bifunctional post-transcriptional regulator, acting genetically downstream of let-7 miRNA and upstream of differentiation effectors [#0, #19]. Its NHL domain is necessary and sufficient for RNA target recognition, binding structured stem-loop hairpin motifs through conserved residues defined by crystal structures of the NHL domain bound to Trincr1 and CDKN1A RNA [#6, #23, #25]. The position of the bound site dictates the silencing mode: 3'UTR binding drives mRNA decay while 5'UTR binding causes translational repression, a rule established by binding-site transplantation [#11]. Through this activity TRIM71 represses a broad target set including CDKN1A/p21 — which it silences via an NMD-dependent (SMG1/UPF1/SMG7) route to promote the G1-S transition — AGO2, EGR1, Rbl1/2, MBNL1, and Hmga2, thereby reinforcing stemness and shaping the transcriptome and splicing landscape [#5, #6, #7, #15, #18, #19, #27]. A second, RING-dependent E3 ubiquitin ligase activity targets AGO2, p53 and mutant p53, Lin28B, and RAF1 for ubiquitination, linking TRIM71 to let-7 biogenesis, apoptosis/differentiation control, and MAPK signaling [#4, #8, #12, #17, #21]. TRIM71 acts on let-7 by two routes — promoting pre-let-7 degradation with LIN28/TUT4 and repressing mature let-7 via AGO2/RISC — forming a bistable feedback loop with the miRNA [#19, #20]. TRIM71 abundance is itself controlled by CDK-1/SCF-SEL-10 phosphodegron-dependent degradation during meiotic maturation and by Pfkp-mediated serine phosphorylation that blocks autoubiquitination [#14, #28]. De novo NHL-domain variants cause congenital hydrocephalus by altering RNA substrate specificity — gain-of-function mutants such as R595H and R783H bind ectopic targets (β-catenin, Lsd1) and impair CDKN1A binding and P-body localization [#22, #24, #30].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established the genetic placement of LIN-41 in the heterochronic pathway, defining it as the developmental-timing effector acting downstream of let-7 and upstream of LIN-29.\",\n      \"evidence\": \"Genetic epistasis and GFP reporter imaging in C. elegans\",\n      \"pmids\": [\"10882102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not show direct miRNA-target binding\", \"Molecular activity of LIN-41 protein unknown at this stage\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated direct let-7 binding to the lin-41 3'UTR through two complementary sites, providing the biochemical basis for the genetic repression.\",\n      \"evidence\": \"In vitro RNA binding, in vivo compensatory mutagenesis, luciferase reporters\",\n      \"pmids\": [\"14729570\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the interaction not resolved\", \"Did not address LIN-41's own activity as a regulator\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Resolved the structural basis of the let-7:lin-41 interaction at LCS2 and LCS1, revealing non-canonical stem-loop features.\",\n      \"evidence\": \"NMR solution structures of the miRNA:mRNA complexes\",\n      \"pmids\": [\"18296482\", \"20660479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures describe the miRNA-target duplex, not TRIM71 protein-RNA recognition\", \"Functional consequence of conformational differences not tested\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed that LIN41 is itself an E3 ubiquitin ligase that ubiquitinates AGO2 and localizes to P-bodies, recasting it from a passive miRNA target into an active regulator of the miRNA machinery.\",\n      \"evidence\": \"In vitro ubiquitylation, reciprocal co-IP, P-body colocalization, gain/loss-of-function western blot in mouse\",\n      \"pmids\": [\"19898466\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not establish RNA-binding/repressor activity\", \"Physiological ubiquitination substrate scope unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Separated TRIM71's two activities, showing the NHL domain mediates RNA binding/repression while the RING domain is dispensable for mRNA silencing, and linked CDKN1A repression to ESC cell-cycle progression.\",\n      \"evidence\": \"Domain-deletion mutagenesis, reporter repression, mRNA decay assays, KD/rescue with cell cycle analysis (two studies)\",\n      \"pmids\": [\"22735451\", \"23125361\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"RNA motif recognized by NHL not yet defined\", \"Mechanism of decay vs translational repression unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Extended the repressor role to reprogramming, identifying EGR1 as a translationally repressed target within the let-7/LIN-41 axis.\",\n      \"evidence\": \"mRNA binding and translational reporter assays during reprogramming\",\n      \"pmids\": [\"24239284\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single lab\", \"Direct binding motif on EGR1 not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Defined germline and reprogramming roles: LIN-41 controls oocyte meiotic maturation via translational repression, ubiquitinates Lin28B to promote let-7, and uses distinct mechanisms in soma vs germline.\",\n      \"evidence\": \"C. elegans null/domain mutants, immunofluorescence, epistasis; human Co-IP, in vivo ubiquitination, domain mapping\",\n      \"pmids\": [\"25261698\", \"24602972\", \"25167051\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of germline-vs-soma mechanistic divergence unresolved\", \"Lin28B ubiquitination findings single lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Established the position-dependent silencing rule and the in vivo RNP composition, and added p53 ubiquitination as a route by which TRIM71 antagonizes apoptosis/differentiation.\",\n      \"evidence\": \"Ribosome profiling, RIP, binding-site transplantation; RNP purification with MS; Co-IP, ubiquitination, mouse KO with neural tube phenotype\",\n      \"pmids\": [\"28111013\", \"28576864\", \"28430184\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How site position is mechanistically read out by effectors not fully defined\", \"p53 ubiquitination substrate determinants partially characterized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the SCF-SEL-10/CDK-1 phosphodegron pathway controlling LIN-41 turnover, explaining how its activity is temporally switched off at meiotic maturation.\",\n      \"evidence\": \"Phosphodegron mutagenesis and domain transplantation, CDK-1/SEL-10 genetics in C. elegans\",\n      \"pmids\": [\"30206186\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct kinase phosphorylating the degrons not identified in this work\", \"Conservation of this degron control in mammals untested here\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Demonstrated that NHL recognizes structured 3'UTR hairpins to drive decay genome-wide, that CDKN1A repression operates through an NMD (SMG1/UPF1/SMG7) axis independent of miRNAs, and connected TRIM71 to splicing (MBNL1), FGF/ERK (Trincr1/SHCBP1), and mutant p53 degradation.\",\n      \"evidence\": \"RIP-seq/RNA-seq, NHL domain assays, NMD-factor knockdown, lncRNA Co-IP/rescue, mutant-p53 ubiquitination\",\n      \"pmids\": [\"31732746\", \"31371437\", \"30911006\", \"31570706\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How NMD machinery is recruited by TRIM71 not structurally defined\", \"Trincr1 and mutant-p53 findings single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Resolved the dual mechanism by which TRIM71 controls let-7: translational repression of AGO2 mRNA plus LIN28/TUT4-dependent pre-let-7 degradation and RISC-dependent target stabilization, supporting a bistable switch.\",\n      \"evidence\": \"Polysome profiling, let-7 quantification, pre-let-7 processing and RISC interaction assays, rescue (two studies)\",\n      \"pmids\": [\"33599613\", \"33975917\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative thresholds of the bistable switch not modeled experimentally\", \"Interplay between the two let-7 routes in vivo unresolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Expanded the ligase substrate set to RAF1 and showed substrate access is competed by HDLBP, linking TRIM71 to MAPK signaling control, alongside Pfkp-mediated stabilizing phosphorylation.\",\n      \"evidence\": \"MS screen, Co-IP competition, ubiquitination/proteasome assays; in vitro kinase and autoubiquitination assays\",\n      \"pmids\": [\"36244648\", \"36660859\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab biochemistry for each\", \"In vivo relevance of HDLBP competition and Pfkp phosphorylation not genetically established\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Provided crystal structures of the NHL domain bound to RNA, defined the determinants of motif recognition, and showed that congenital-hydrocephalus mutations are gain-of-function that retarget TRIM71 to ectopic mRNAs (β-catenin, Lsd1) while impairing canonical CDKN1A binding.\",\n      \"evidence\": \"X-ray crystallography with mutagenesis and RIP; PAR-CLIP/RIP target ID, translation reporters, target-specific rescue; IMP1 Co-IP/RIP-seq; cochlear organoid domain mutants\",\n      \"pmids\": [\"38036331\", \"40180090\", \"36573342\", \"36757932\", \"32816599\", \"37492931\", \"37670562\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the RING/E3 module and its substrate engagement not solved\", \"How single NHL substitutions create new specificities mechanistically unresolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked TRIM71 NHL variants causally to human congenital hydrocephalus via impaired CDKN1A binding and disrupted P-body localization, and identified an m6A/IGF2BP1-dependent mRNA-stabilizing role in liver cancer.\",\n      \"evidence\": \"Exome sequencing with family validation, functional binding/localization assays, single-cell transcriptomics; Co-IP, RIP, m6A pharmacology\",\n      \"pmids\": [\"38833623\", \"39267787\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"m6A-dependent stabilization mechanism single lab\", \"How loss-of-binding vs gain-of-function variants converge on the same disease unresolved\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defined developmental in vivo target programs: TRIM71 restricts TGFβ-type signaling (Inhba/Tgfbr2) to maintain cochlear progenitors and represses Eomes to permit proper gastrulation and primitive erythropoiesis.\",\n      \"evidence\": \"Conditional/global KO mice, scRNA-seq, NHL repression assays, genetic epistasis\",\n      \"pmids\": [\"40892928\", \"39909558\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Eomes findings single lab\", \"Relative contribution of decay vs translational repression for these targets in vivo not dissected\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How TRIM71's RNA-binding and E3-ligase activities are coordinated on shared substrates (e.g., AGO2 mRNA vs AGO2 protein), and how its abundance and substrate specificity are integrated by upstream signals across tissues, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of full-length TRIM71 or its RING-substrate complexes\", \"Mechanism switching between mRNA stabilization and repression not defined\", \"Integration of phosphorylation, degron control, and lncRNA inhibition in vivo unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [6, 11, 15, 18, 19, 23, 25]},\n      {\"term_id\": \"GO:0016874\", \"supporting_discovery_ids\": [4, 8, 12, 17, 21, 34]},\n      {\"term_id\": \"GO:0140096\", \"supporting_discovery_ids\": [4, 8, 12, 17, 21]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [6, 7, 11, 19, 22]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [6, 11, 15, 18]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [4, 16]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [4, 5, 30]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [11, 15, 18, 19, 20]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [4, 8, 12, 17, 21]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [0, 9, 27, 31, 32]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [5, 15]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [16, 21, 24, 31]}\n    ],\n    \"complexes\": [\"RISC (TRIM71-AGO2 RNP)\", \"P-body\"],\n    \"partners\": [\"AGO2\", \"LIN28B\", \"TUT4\", \"RAF1\", \"p53\", \"IGF2BP1\", \"IMP1\", \"HDLBP\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}