{"gene":"MBNL1","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":2008,"finding":"Crystal structure of MBNL1 zinc fingers 3 and 4 (ZnF3/4) bound to r(CGCUGU) revealed that both ZnF3 and ZnF4 target GC steps, with site-specific recognition mediated primarily by main-chain hydrogen bonds. The relative alignment of the two ZnF domains is dictated by the interdomain linker topology, resulting in an antiparallel orientation of bound GC elements and a chain-reversal loop trajectory for bound pre-mRNA targets.","method":"X-ray crystallography (crystal structure of ZnF3/4–RNA complex)","journal":"Nature structural & molecular biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with atomic-resolution detail of RNA-protein contacts, single rigorous structural study","pmids":["19043415"],"is_preprint":false},{"year":2006,"finding":"MBNL1 protein translocates from a predominantly cytoplasmic to nuclear distribution during a post-natal window (days 2–20 in mice), and this nuclear localization is required for a synchronized set of developmentally regulated splicing switches in skeletal muscle. In MBNL1 knockout mice these physiological splicing transitions fail, reproducing the splicing defects of DM1. Deficiency of MBNL2 does not reproduce this phenotype, establishing MBNL1 as the non-redundant factor for these post-natal transitions.","method":"Transgenic mouse model (CUG-repeat expression), MBNL1 knockout mice, RT-PCR splicing assays, immunofluorescence for subcellular localization","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — loss-of-function KO with defined cellular phenotype plus localization experiment, replicated in both mouse model and human DM1 tissue","pmids":["16717059"],"is_preprint":false},{"year":2004,"finding":"MBNL1 is the primary determinant of DM1 nuclear focus integrity and aberrant insulin receptor (IR) exon 11 splicing. siRNA-mediated knockdown of MBNL1 in normal myoblasts recapitulates aberrant IR splicing; rescue experiments in DM1 myoblasts showed that restoring MBNL1 function (but not suppressing CUG-BP) is the key event for correcting splicing. MBNL1 facilitates IR exon 11 inclusion in a dose-dependent manner, antagonized by CUG-BP.","method":"siRNA knockdown, overexpression rescue experiments, RT-PCR splicing assays in DM1 myoblasts","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain/loss-of-function with rescue, replicated across normal and DM1 cell systems","pmids":["15546872"],"is_preprint":false},{"year":2004,"finding":"MBNL1 specifically binds CHHG (where H = A, U, or C) and CHG repeat RNA motifs, including CUG and CCUG repeats, as demonstrated by yeast three-hybrid assays with synthetic RNAs. MBNL1 does not bind canonical double-stranded CUG/CAG RNA, indicating preference for bulge-containing double-stranded RNA. Deletion analysis showed differences in RNA-binding ability among splice variants of MBNL1.","method":"Yeast three-hybrid assay, RNA-binding assays with synthetic RNAs, deletion mutagenesis","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro RNA-binding assay with systematic mutagenesis and sequence variation; single lab but multiple RNA substrates tested","pmids":["14722159"],"is_preprint":false},{"year":2010,"finding":"SELEX identified the YGCY (Y = pyrimidine) motif as the preferred RNA-binding element for MBNL1. Insertion of multiple YGCY motifs into an MBNL1-independent splicing reporter was sufficient to confer MBNL1-dependent regulation. MBNL1 regulates ATP2A1 exon 22 splicing through YGCY motifs. YGCY motifs are enriched in positions predicted to cause exon skipping or inclusion consistent with DM1 mis-splicing patterns.","method":"Doped SELEX, minigene splicing reporter assays, RT-PCR","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — SELEX for binding motif identification plus functional validation in splicing reporters with mutagenesis; single lab, two orthogonal methods","pmids":["20071745"],"is_preprint":false},{"year":2009,"finding":"MBNL1 controls splicing of cardiac troponin T (cTNT) exon 5 by directly competing with the essential splicing factor U2AF65 for binding at the 3' end of intron 4. MBNL1 and U2AF65 bind mutually exclusive RNA secondary structures: MBNL1 binds a stem-loop form while U2AF65 binds the same region in a single-stranded form. When U2AF65 is displaced, U2 snRNP cannot be recruited and the downstream exon is skipped.","method":"In vitro RNA-binding competition assays, RNA secondary structure probing, splicing assays, mutagenesis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of competitive binding plus structure probing and mutational validation; multiple orthogonal methods","pmids":["19470458"],"is_preprint":false},{"year":2010,"finding":"MBNL1 promotes insulin receptor exon 11 inclusion by binding directly to a downstream intronic splicing enhancer within intron 11. RNA affinity chromatography identified MBNL1 as the binding factor; RNP immunoprecipitation confirmed in-cell binding to INSR RNA; overexpression or knockdown of Mbnl1 altered exon 11 inclusion levels; deletion of the intronic enhancer abolished MBNL1-mediated regulation.","method":"RNA affinity chromatography, RNP immunoprecipitation, minigene deletion mutagenesis, overexpression/knockdown","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — RNA affinity pulldown, RIP, minigene deletion mutagenesis, and gain/loss-of-function; multiple orthogonal methods in single lab","pmids":["20519504"],"is_preprint":false},{"year":2011,"finding":"MBNL1 autoregulates its own pre-mRNA by binding within the 3' end of intron 4 to suppress inclusion of exon 5. Structure probing and footprinting showed the MBNL1 response element is primarily unstructured. The branch point is 141 nucleotides from the 3' splice site (non-canonical). Deletion of the MBNL1 response element abolished regulation and led to constitutive exon 5 inclusion.","method":"Minigene splicing assay, RNA structure probing, MBNL1 footprinting, branch-point mapping, deletion mutagenesis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro footprinting plus functional minigene mutagenesis; multiple orthogonal methods","pmids":["21832083"],"is_preprint":false},{"year":2012,"finding":"MBNL1 binds to 3' UTRs genome-wide and promotes accelerated mRNA decay for a broad set of transcripts, a function distinct from and in addition to its role in alternative splicing regulation. Position of MBNL1 binding on pre-mRNA influences whether it promotes exon inclusion or skipping.","method":"CLIP-seq (in vivo RNA-binding sites), exon array, RT-PCR, mRNA stability analysis","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — genome-wide CLIP-seq plus expression array and RT-PCR validation; two orthogonal methods, single lab","pmids":["22355723"],"is_preprint":false},{"year":2010,"finding":"A systematic analysis of MBNL1 binding to single-stranded RNAs showed that a single GC dinucleotide in a poly-U context is sufficient for MBNL1 binding; a second GC dinucleotide confers higher affinity; additional GC dinucleotides do not further enhance binding. The distance between the two GC dinucleotides can vary from 1 to 17 nucleotides for high-affinity binding, indicating conformational flexibility. Flanking sequence preference: U > C > A > G.","method":"Fluorescence-based RNA-binding assays, systematic RNA sequence variation","journal":"BMC molecular biology","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro binding assay with systematic RNA sequence variation; single lab, single method","pmids":["21548961"],"is_preprint":false},{"year":2010,"finding":"Combinatorial mutagenesis of MBNL1 zinc finger domains showed that the two ZnF pairs have differential RNA-binding affinity and distinct splicing activities. Splicing activity profiles of ZnF mutants vary across different pre-mRNA substrates, revealing two distinct classes of MBNL1-regulated splicing events. For some transcripts, robust splicing activity is maintained even in the absence of detectable RNA binding, indicating RNA-binding-independent mechanisms.","method":"Combinatorial ZnF mutagenesis, splicing reporter assays, RNA-binding assays","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro mutagenesis combined with functional splicing assays across multiple substrates; multiple orthogonal methods","pmids":["22890842"],"is_preprint":false},{"year":2010,"finding":"Functional domains of MBNL1 required for splicing activation and repression are separable from the zinc-finger RNA-binding domains. An 80-amino-acid segment downstream of the N-terminal zinc-finger pair contains core regulatory regions for both splicing activation (IR exon 11) and repression (cTNT exon 5). The MBNL1 response element for IR exon 11 consists of a cluster of three downstream binding sequences. Deletions of these regulatory regions abolished splicing regulation without preventing RNA binding.","method":"Sequential deletion mapping, minigene splicing reporter assays, RNA-binding assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — deletion mutagenesis with functional splicing assays and RNA-binding verification; multiple constructs and substrates","pmids":["21109529"],"is_preprint":false},{"year":2011,"finding":"MBNL1 colocalizes with YB-1 and DDX1 in cytoplasmic stress granules upon cellular stress. GST pulldown identified YB-1 and DDX1 as MBNL1-binding proteins; MBNL1 forms an RNP complex with these proteins. This provides evidence for a cytoplasmic role of MBNL1 in mRNA metabolism.","method":"GST pulldown, immunofluorescence colocalization, RNP complex assays","journal":"Journal of neuroscience research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — GST pulldown identification of binding partners plus colocalization; single lab, two complementary methods","pmids":["18335541"],"is_preprint":false},{"year":2011,"finding":"The RNA helicase p68/DDX5 forms complexes on in vitro-transcribed CUG repeats, colocalizes with nuclear RNA foci in DM1 cells, and increases MBNL1 binding to both pathological CUG repeats and the cTNT pre-mRNA regulatory stem-loop. Mutations in the helicase core of p68 prevented both the stimulatory effect on MBNL1 binding and colocalization with CUG foci, suggesting that p68 remodels RNA secondary structure to facilitate MBNL1 binding.","method":"In vitro RNA-protein complex assembly, immunofluorescence colocalization, MBNL1 binding assays, helicase-core mutagenesis, splicing reporter assays","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (binding assay, colocalization, mutagenesis, splicing readout) in single lab","pmids":["22156369"],"is_preprint":false},{"year":2013,"finding":"MBNL1 binds UGC/CUG clusters in Tpm1 (alpha-tropomyosin) pre-mRNA and cooperates with PTB to repress exon 3 splicing in smooth muscle cells. The N-terminal region of MBNL1 containing all four CCCH zinc fingers is sufficient for repression. MBNL1 makes a direct protein-protein interaction with PTB, and RNA binding by MBNL1 promotes this interaction by inducing a conformational change. Single-molecule analysis showed MBNL1 binding sites increase PTB occupancy at its own sites.","method":"Minigene splicing reporter, pulldown (protein-protein interaction), single-molecule FRET/TIRF, RNA footprinting","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of protein-protein interaction, single-molecule analysis, and minigene mutagenesis; multiple orthogonal methods","pmids":["23511971"],"is_preprint":false},{"year":2014,"finding":"MBNL1 nuclear localization is controlled by two classes of nuclear localization signals (NLS): a classical bipartite NLS and a novel conformational NLS. Alternative splicing of exon 7 acts as a switch between these NLS types and couples MBNL1 splicing activity to intracellular localization. Nuclear MBNL1 promotes nuclear retention of mutant CUG/CAG-repeat-containing RNA and represses expression of homopolymeric proteins produced through RAN translation from these retained RNAs.","method":"NLS domain mapping, exon 7 splicing manipulation, immunofluorescence/subcellular fractionation, RAN translation reporter assays","journal":"Human molecular genetics","confidence":"High","confidence_rationale":"Tier 2 / Moderate — NLS mapping with functional localization assay, splicing switch experiments, and RAN translation readout; multiple methods","pmids":["25274774"],"is_preprint":false},{"year":2017,"finding":"MBNL1 exon 1 autoregulation: CLIP-seq revealed MBNL1 binds its own exon 1 (encoding the 5'UTR major portion and amino-terminal region). MBNLs induce skipping of exon 1 from precursor MBNL1 mRNA. Exon 1 exclusion impacts polysome association and translation. The exon 1-deficient protein isoform (lacking the first two zinc fingers) is highly unstable and has severely compromised splicing activity. MBNL1 can be transcribed from three different promoters, and transcription initiation site determines the mode of exon 1 regulation.","method":"CLIP-seq, minigene/splicing assays, polysome profiling, protein stability assays, promoter analysis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — CLIP-seq plus functional assays (polysome profiling, stability, splicing); multiple orthogonal methods, single lab","pmids":["27903900"],"is_preprint":false},{"year":2018,"finding":"K63-linked polyubiquitination of MBNL1 is required for its cytoplasmic localization and function in promoting neurite outgrowth. Expanded CUG RNA induces deubiquitination of cytoplasmic MBNL1, causing nuclear translocation and morphological impairment. Inhibiting K63-linked polyubiquitin chain degradation ameliorated morphological defects in DM1 neurons. The cytoplasmic (but not nuclear) MBNL1 isoform promotes neurite morphogenesis.","method":"Ubiquitination assays, subcellular fractionation, immunofluorescence, neurite morphology quantification, pharmacological inhibition of deubiquitination","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Moderate — ubiquitination assays with fractionation and functional phenotypic rescue; multiple orthogonal methods","pmids":["29490267"],"is_preprint":false},{"year":2015,"finding":"MBNL1 directly binds to and regulates a network of differentiation-specific transcripts including SRF (serum response factor) and calcineurin Aβ 3'UTRs to promote myofibroblast differentiation. CRISPR-Cas9 editing of the MBNL1-binding site within the Srf 3'UTR impaired myofibroblast differentiation. Loss of Mbnl1 in mice abrogated myofibroblast transformation and impaired fibrotic wound healing after myocardial infarction and dermal injury.","method":"RNA-IP (direct binding), CRISPR-Cas9 mutagenesis of binding site, mouse KO models (myocardial infarction, dermal injury), genome-wide screen","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — CRISPR functional validation of binding site, in vivo KO phenotype, and RNA-IP; multiple orthogonal methods with in vivo confirmation","pmids":["26670661"],"is_preprint":false},{"year":2015,"finding":"MBNL1 overexpression increases nuclear retention of full-length expanded HTT (expHTT) RNA and decreases cytoplasmic expHTT protein expression. U2AF65 has the opposite effect, decreasing expHTT nuclear retention and increasing cytoplasmic expHTT protein, suggesting MBNL1 and U2AF65 antagonistically regulate nuclear export of expHTT RNA.","method":"Overexpression studies, subcellular fractionation, immunofluorescence, western blotting","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 3 / Weak — overexpression with fractionation; single lab, limited mechanistic follow-up","pmids":["26218986"],"is_preprint":false},{"year":2013,"finding":"MBNL1 and RBFOX2 cooperatively control a splicing programme involved in late mesoderm differentiation during reprogramming to iPSCs and redifferentiation. MBNL1 and RBFOX2 co-regulate at least 10 conserved alternative splicing events (including PLOD2, ATP2A1, ITGA6, MARK2, and others), and their combined activity is required for differentiated splicing patterns in vertebrates.","method":"High-throughput RT-PCR during iPSC induction and redifferentiation, knockdown of individual splicing factors","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — high-throughput splicing profiling with knockdown validation; single study but large-scale systematic approach","pmids":["24048253"],"is_preprint":false},{"year":2014,"finding":"MBNL1 and MBNL2 act synergistically as enhancers of Tau exon 2 inclusion. An intronic region 250 nucleotides downstream of Tau exon 2 contains cis-regulatory splicing enhancers that directly bind MBNL1. Interaction of both MBNL1 and MBNL2 is required to fully reverse Tau exon 2 mis-splicing induced by long CUG repeats.","method":"Tau minigene reporter assays, MBNL1 direct binding assay, siRNA knockdown, overexpression","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding plus functional minigene with mutagenesis and combinatorial knockdown; single lab","pmids":["24440524"],"is_preprint":false},{"year":2014,"finding":"MBNL1 knockdown in murine fetal liver erythroid progenitors caused a strong block in erythroid terminal differentiation and disrupted developmentally regulated exon skipping of Ndel1 mRNA. MBNL1 directly binds Ndel1 mRNA (confirmed by CLIP). Ndel1 exon skipping regulated by MBNL1 is critical for erythroid terminal proliferation.","method":"shRNA knockdown, erythroid differentiation assay, CLIP, RT-PCR splicing analysis","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CLIP-confirmed direct binding plus loss-of-function with defined differentiation phenotype; single lab","pmids":["24869935"],"is_preprint":false},{"year":2017,"finding":"Pseudouridine (Ψ) modification of uridines in MBNL1-binding RNAs inhibits MBNL1 binding by reducing RNA flexibility. Ψ modification of minimally structured YGCY-containing RNA more robustly inhibited MBNL1 binding than modification of CCUG repeats (which can only be modified at one pyrimidine position per motif). Molecular dynamics simulations confirmed that reduced RNA flexibility underlies the reduced binding.","method":"Fluorescence polarization binding assays, pseudouridine-modified RNA synthesis, molecular dynamics simulations","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro binding assay with chemically modified RNAs and MD simulations; single lab, two orthogonal methods","pmids":["28130447"],"is_preprint":false},{"year":2018,"finding":"rbFOX1 binds expanded CCUG RNA repeats (DM2) but not expanded CUG repeats (DM1), and competes with MBNL1 for binding to CCUG expanded repeats. Overexpression of rbFOX1 partly releases MBNL1 from CCUG RNA foci in DM2 muscle cells and corrects MBNL1-dependent alternative splicing alterations.","method":"RNA-binding assays (competition), immunofluorescence (foci), alternative splicing RT-PCR, Drosophila genetic rescue model","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — competitive binding assays, cell-based foci release, splicing correction, and in vivo Drosophila rescue; multiple orthogonal methods","pmids":["29789616"],"is_preprint":false},{"year":2018,"finding":"MBNL1 splicing isoforms containing exon 7 (ex7) are required for MBNL1 homodimerization. Isoforms lacking ex7 (MBNL1 Δex7) act as dominant negative proteins: splice-switching antisense oligonucleotides inducing ex7 exclusion caused DNA damage and inhibited cell viability and migration in prostate cancer cells. Components of the U2 splicing complex (SF3B1, SF3A1, PHF5A) are required for efficient ex7 inclusion.","method":"Antisense oligonucleotides for splice switching, siRNA, dimerization assays, viability/migration assays, SF3B1/SF3A1/PHF5A knockdown","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — splice-switching ASOs with functional phenotyping and dimerization assay; single lab, multiple methods","pmids":["30456384"],"is_preprint":false},{"year":2019,"finding":"TRIM71 represses MBNL1 expression in mouse embryonic stem cells by binding hairpin motifs in the MBNL1 3'UTR, predominantly causing MBNL1 mRNA degradation. Through MBNL1 repression, TRIM71 promotes embryonic (fetal) splicing patterns, thereby regulating stem cell differentiation state.","method":"RNA-IP (TRIM71-MBNL1 mRNA interaction), TRIM71 loss-of-function, alternative splicing analysis, target mRNA stability assays","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA-IP showing direct 3'UTR interaction plus epistasis (TRIM71 → MBNL1 → splicing); single lab","pmids":["31371437"],"is_preprint":false},{"year":2020,"finding":"MBNL1 regulates alternative splicing (predominantly intron exclusion) of DOT1L and SETD1A transcripts in MLL-rearranged leukemia cells. Loss of MBNL1 significantly impairs propagation of murine and human MLL-rearranged leukemia in vitro and in vivo. A small molecule MBNL1 inhibitor selectively kills leukemic cells.","method":"shRNA knockdown, RNA-seq (transcriptomic profiling), in vivo mouse leukemia model, small molecule inhibitor treatment","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Moderate — transcriptomic profiling of splicing targets with in vitro and in vivo loss-of-function and pharmacological validation; multiple methods","pmids":["32398749"],"is_preprint":false},{"year":2020,"finding":"MBNL1 inhibits autophagy via the mTOR pathway to promote proliferation of skeletal muscle satellite cells. In DM1 satellite cells, reduced cytoplasmic MBNL1 leads to elevated autophagy and reduced mTOR phosphorylation. MBNL1 overexpression increased mTOR phosphorylation and enhanced proliferative capacity; this effect was abolished by rapamycin (mTOR inhibitor), placing MBNL1 upstream of mTOR in the autophagy-regulatory pathway.","method":"iPSC-derived satellite cells, TALEN gene editing, MBNL1 overexpression, rapamycin inhibition, western blotting for mTOR phosphorylation, autophagy markers","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epistasis established by pharmacological mTOR inhibition rescuing MBNL1 overexpression effect; single lab with multiple lines","pmids":["32683410"],"is_preprint":false},{"year":2015,"finding":"MBNL1 binds to the terminal loop of C-allelic pre-miR-1307 at a 'UGCUGC' motif and blocks Dicer processing, resulting in downregulation of mature miR-1307 expression. This reduces miR-1307-mediated repression of its target Bcl2. Both C-allelic and T-allelic pre-miR-1307 are bound by MBNL1.","method":"RNA-protein binding assays, Dicer processing assay, miRNA expression measurement, luciferase reporter for Bcl2","journal":"Carcinogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding shown and functional consequence (Dicer blocking) demonstrated; single lab","pmids":["25977444"],"is_preprint":false},{"year":2021,"finding":"Loss of MBNL1 induces aberrant splicing of the Abi1 gene, specifically promoting the Abi1-Δe10 isoform in vascular smooth muscle cells. Abi1-Δe10 activates Rac1 independently of upstream stimulation, triggering the Rac1-NOX1-ROS pathway and increasing KLF4 transcription factor expression, which drives VSMC macrophage-like transdifferentiation during atherogenesis.","method":"siRNA knockdown, overexpression, RT-PCR splicing assay, in vivo atherosclerosis tissue analysis, pathway inhibition assays","journal":"Cell proliferation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — splicing mechanism linked to downstream signaling pathway via isoform-specific functional assays; single lab","pmids":["33759281"],"is_preprint":false},{"year":2023,"finding":"Loss of MBNL1 increases inclusion of Mbnl2 exon 6 and exon 9. Mbnl2 exon 6 inclusion increases MBNL2 nuclear translocation. Mbnl2 exon 9 encodes a PEST domain that targets the protein for proteasomal degradation; exon 9 exclusion (caused by loss of MBNL1) removes this PEST domain and stabilizes MBNL2, providing a compensatory mechanism whereby MBNL1 loss upregulates MBNL2 protein levels.","method":"RT-PCR splicing analysis, subcellular fractionation, protein stability assays, proteasome inhibition, DM1 mouse model validation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — mechanistic PEST domain identification with proteasome assay, fractionation, and in vivo DM1 model confirmation; multiple methods","pmids":["36617982"],"is_preprint":false},{"year":2024,"finding":"MBNL1 is regulated by the MEIS1/calcineurin signaling axis and stabilizes adult myocyte mRNAs (including cell cycle inhibitor transcripts) to maintain cardiomyocyte maturity and suppress proliferation. Early MBNL1 overexpression prematurely transitions cardiomyocytes to hypertrophic growth and hypoplasia; MBNL1 deletion increases cardiomyocyte cell cycle entry and proliferation through altered cell cycle inhibitor transcript stability. MBNL1 dosage tunes the neonatal cardiac regeneration window.","method":"Cardiac-specific MBNL1 gain/loss-of-function mouse models, multi-omics, mRNA stability assays, histology, surgical heart regeneration models","journal":"Circulation","confidence":"High","confidence_rationale":"Tier 2 / Strong — in vivo cardiac-specific KO and OE with multi-omics and biochemical mRNA stability assays; multiple orthogonal methods with in vivo phenotype","pmids":["38426339"],"is_preprint":false},{"year":2022,"finding":"CDK12 phosphorylates MBNL1, and BUD13 stabilizes CDK12 mRNA via m6A methylation. CDK12-mediated MBNL1 phosphorylation regulates vasculogenic mimicry (VM) formation in glioblastoma cells. Knockdown of BUD13 or CDK12 or overexpression of MBNL1 inhibited VM formation.","method":"Co-IP, western blotting for phosphorylation, siRNA knockdown, in vitro kinase assay (implied by phosphorylation data), xenograft tumor model","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — phosphorylation shown and functional consequence demonstrated; kinase identity established by knockdown; single lab","pmids":["36463205"],"is_preprint":false},{"year":2020,"finding":"Loss of MBNL1 in the thymus leads to postnatal thymic hyperplasia with thymocyte accumulation in Mbnl1 129S1 knockout mice. MBNL1 is required for normal thymus development and function, with its loss causing extensive mis-splicing events including TCF/LEF family transcription factor transcripts.","method":"Mbnl1 knockout mouse model, RNA-seq transcriptome analysis, histology","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO with defined cellular phenotype plus transcriptomic validation; single lab","pmids":["32332745"],"is_preprint":false},{"year":2018,"finding":"In glioblastoma, hypoxia causes export of MBNL1 from the nucleus, resulting in loss of MBNL1 splicing activity and promotion of fetal/stem-like alternative splicing patterns. Forced expression of a constitutively active (nuclear) MBNL1 isoform inhibited glioma stem cell self-renewal and tumor initiation in orthotopic models and dramatically inhibited tumor progression.","method":"Subcellular fractionation/immunofluorescence under hypoxia, splicing assays, orthotopic xenograft models, forced MBNL1 expression","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — hypoxia-induced localization change linked to splicing phenotype with in vivo orthotopic rescue; single lab","pmids":["32928918"],"is_preprint":false}],"current_model":"MBNL1 is a CCCH zinc-finger RNA-binding protein that recognizes YGCY (GC-step-containing pyrimidine-rich) motifs in pre-mRNA and 3'UTR sequences; its tandem ZnF pairs make direct base-specific contacts (established by crystal structure), and binding is enhanced by RNA flexibility. In the nucleus, MBNL1 acts as a position-dependent alternative splicing regulator—repressing or activating exon inclusion by competing with U2AF65 for splice-site access, recruiting co-repressors such as PTB, and autoregulating its own exon 1 and exon 5 splicing; nuclear localization is controlled by alternative splicing of exon 7 (toggling between bipartite and conformational NLS types) and by K63-linked polyubiquitination that retains a cytoplasmic pool. In the cytoplasm, MBNL1 binds 3'UTRs to promote mRNA decay and stabilize specific transcripts (including cell cycle inhibitor mRNAs in cardiomyocytes), associates with YB-1 and DDX1 in stress granules, and is regulated upstream by CDK12-mediated phosphorylation and TRIM71-mediated mRNA degradation. Sequestration of MBNL1 in nuclear CUG/CCUG-repeat RNA foci in myotonic dystrophy ablates these activities, causing failure of post-natal splicing transitions in muscle, heart, brain, thymus, and erythroid cells, and in this context the RNA helicase p68/DDX5 acts as a modifier by remodeling RNA structure to enhance MBNL1 binding to its targets."},"narrative":{"mechanistic_narrative":"MBNL1 is a CCCH tandem-zinc-finger RNA-binding protein that governs post-natal alternative-splicing transitions and 3'UTR-directed mRNA fate decisions across muscle, heart, brain, thymus, and erythroid lineages [PMID:16717059, PMID:22355723, PMID:38426339]. Its zinc fingers recognize a YGCY/GC-step element: crystallography of ZnF3/4 bound to r(CGCUGU) showed both fingers target GC steps through main-chain hydrogen bonds in an antiparallel arrangement [PMID:19043415], SELEX defined YGCY as the preferred motif sufficient to confer MBNL1-dependent splicing regulation [PMID:20071745], and a single GC dinucleotide in a pyrimidine-rich context with flexible spacing is sufficient for binding [PMID:21548961]; binding requires RNA flexibility, since pseudouridine modification that rigidifies the RNA inhibits it [PMID:28130447]. In the nucleus MBNL1 acts as a position-dependent splicing regulator that competes with U2AF65 for splice-site access to block U2 snRNP recruitment [PMID:19470458], cooperates with PTB through an RNA-induced protein-protein interaction to repress exons [PMID:23511971], and autoregulates its own pre-mRNA at exon 1 and exon 5 [PMID:21832083, PMID:27903900] as well as MBNL2 isoform output [PMID:36617982]. RNA-binding and splicing-regulatory functions are separable: a regulatory segment downstream of the N-terminal zinc fingers drives activation and repression independently of binding [PMID:22890842, PMID:21109529]. MBNL1 nuclear access is set by alternative splicing of exon 7, which toggles between bipartite and conformational NLS types [PMID:25274774], and by K63-linked polyubiquitination that retains a cytoplasmic neurite-promoting pool [PMID:29490267]. A second, cytoplasmic function involves direct 3'UTR binding to accelerate decay of many transcripts [PMID:22355723] or to stabilize specific mRNAs, including SRF and calcineurin transcripts driving myofibroblast differentiation [PMID:26670661] and cell-cycle-inhibitor transcripts maintaining cardiomyocyte maturity [PMID:38426339]. In myotonic dystrophy, MBNL1 is sequestered into nuclear CUG/CCUG-repeat RNA foci—it binds bulge-containing repeat RNA rather than canonical duplex [PMID:14722159], and the helicase p68/DDX5 remodels repeat and target RNA structure to enhance MBNL1 binding [PMID:22156369]—causing failure of the developmental splicing transitions that depend non-redundantly on MBNL1 [PMID:16717059, PMID:15546872]. MBNL1 dosage and localization further control cancer phenotypes in glioma, MLL-rearranged leukemia, and prostate cancer [PMID:32398749, PMID:32928918, PMID:30456384].","teleology":[{"year":2004,"claim":"Established that MBNL1 is the causal effector of DM1 mis-splicing by showing its loss recapitulates and its restoration rescues aberrant insulin receptor splicing, defining the disease-relevant function.","evidence":"siRNA knockdown and overexpression rescue with RT-PCR splicing assays in normal and DM1 myoblasts","pmids":["15546872"],"confidence":"High","gaps":["Did not define the RNA element or mechanism of exon recognition","Restricted to a single splicing target"]},{"year":2004,"claim":"Defined the RNA preference underlying repeat sequestration by showing MBNL1 binds CHHG/CHG and bulge-containing CUG/CCUG repeats but not canonical duplex RNA, explaining its capture in repeat foci.","evidence":"Yeast three-hybrid and RNA-binding assays with synthetic RNAs and deletion mutagenesis","pmids":["14722159"],"confidence":"High","gaps":["In vitro motif definition not yet linked to genome-wide endogenous targets","Did not resolve atomic basis of recognition"]},{"year":2006,"claim":"Showed MBNL1 nuclear translocation during a defined post-natal window drives developmental splicing switches and is non-redundant with MBNL2, establishing its physiological role and the cellular basis of DM1.","evidence":"MBNL1 and MBNL2 knockout mice, CUG-repeat transgenics, immunofluorescence localization and RT-PCR","pmids":["16717059"],"confidence":"High","gaps":["Mechanism controlling the localization switch not defined","Did not identify the full target transcript network"]},{"year":2008,"claim":"Provided the atomic basis of RNA recognition, showing both ZnF3 and ZnF4 contact GC steps via main-chain hydrogen bonds with linker-dictated antiparallel geometry.","evidence":"X-ray crystal structure of the ZnF3/4–r(CGCUGU) complex","pmids":["19043415"],"confidence":"High","gaps":["Only one of the two ZnF pairs structurally resolved","Does not explain RNA-binding-independent regulatory activity"]},{"year":2009,"claim":"Defined a direct mechanism for splicing repression: MBNL1 competes with U2AF65 for a mutually exclusive RNA structure, blocking U2 snRNP recruitment.","evidence":"In vitro competition binding, RNA structure probing, splicing assays and mutagenesis on cTNT exon 5","pmids":["19470458"],"confidence":"High","gaps":["Competition shown for one transcript","Did not address how position dictates activation versus repression"]},{"year":2010,"claim":"Defined the consensus YGCY binding motif and showed it is sufficient to confer MBNL1-dependent regulation, plus that a single flexibly-spaced GC dinucleotide drives binding.","evidence":"Doped SELEX, minigene reporters, and fluorescence-based binding with systematic sequence variation","pmids":["20071745","21548961"],"confidence":"High","gaps":["Affinity rules not connected to in vivo occupancy","Did not address binding to structured repeat RNA"]},{"year":2010,"claim":"Separated RNA-binding from regulatory activity, mapping the two ZnF pairs to distinct splicing classes and a downstream 80-aa segment as the core activation/repression module independent of binding.","evidence":"Combinatorial ZnF and sequential deletion mutagenesis with splicing reporters and RNA-binding assays","pmids":["22890842","21109529"],"confidence":"High","gaps":["Effectors recruited by the regulatory segment not identified","Mechanism of binding-independent activity unresolved"]},{"year":2010,"claim":"Identified the intronic enhancer mechanism for splicing activation, showing MBNL1 binds downstream of INSR exon 11 to promote its inclusion.","evidence":"RNA affinity chromatography, RNP-IP, minigene deletion, gain/loss-of-function","pmids":["20519504"],"confidence":"High","gaps":["Did not identify co-factors enabling activation","Single transcript context"]},{"year":2011,"claim":"Demonstrated autoregulation, showing MBNL1 binds an unstructured element in its own intron 4 to suppress exon 5 inclusion, establishing a feedback loop on its splicing output.","evidence":"Minigene assays, RNA structure probing, footprinting, branch-point mapping","pmids":["21832083"],"confidence":"High","gaps":["Physiological consequence of exon 5 toggling not addressed here","Did not link to protein function"]},{"year":2011,"claim":"Revealed a cytoplasmic role by placing MBNL1 in stress-granule RNP complexes with YB-1 and DDX1.","evidence":"GST pulldown, immunofluorescence colocalization, RNP complex assays","pmids":["18335541"],"confidence":"Medium","gaps":["No reciprocal validation of interactions","Functional consequence of granule association undefined"]},{"year":2011,"claim":"Identified p68/DDX5 as a structural modifier that remodels RNA to enhance MBNL1 binding to both pathological CUG repeats and target pre-mRNA.","evidence":"In vitro complex assembly, colocalization, helicase-core mutagenesis, splicing reporters","pmids":["22156369"],"confidence":"High","gaps":["Genome-wide scope of DDX5 modulation unknown","Direct MBNL1-DDX5 contact not resolved"]},{"year":2012,"claim":"Established the second major MBNL1 function—3'UTR binding genome-wide to accelerate mRNA decay—and showed binding position dictates exon inclusion versus skipping.","evidence":"CLIP-seq, exon arrays, RT-PCR, mRNA stability analysis","pmids":["22355723"],"confidence":"High","gaps":["Decay machinery recruited by MBNL1 not identified","Did not separate decay targets from stabilized targets"]},{"year":2013,"claim":"Defined a cooperative repression mechanism in which RNA binding induces an MBNL1 conformational change that recruits PTB and increases its occupancy.","evidence":"Minigene reporters, protein-protein pulldown, single-molecule FRET/TIRF, footprinting on Tpm1","pmids":["23511971"],"confidence":"High","gaps":["Generality of PTB cooperation across targets unknown","Conformational change not structurally resolved"]},{"year":2013,"claim":"Placed MBNL1 in a combinatorial splicing program with RBFOX2 controlling mesoderm differentiation, broadening its role beyond muscle.","evidence":"High-throughput RT-PCR during iPSC induction/redifferentiation with knockdowns","pmids":["24048253"],"confidence":"Medium","gaps":["Mechanism of co-regulation not resolved","Direct binding not demonstrated for all co-targets"]},{"year":2014,"claim":"Resolved how MBNL1 localization is encoded, identifying exon-7 splicing as a switch between bipartite and conformational NLS types that couples localization to activity and to repeat-RNA retention.","evidence":"NLS mapping, exon 7 manipulation, fractionation, RAN-translation reporters","pmids":["25274774"],"confidence":"High","gaps":["Upstream control of exon 7 choice not defined here","Did not address cytoplasmic functions of exon-7 isoforms"]},{"year":2014,"claim":"Extended MBNL1 splicing regulation to neuronal Tau exon 2 and to erythroid differentiation via Ndel1, showing direct binding underlies lineage-specific programs.","evidence":"Tau minigene/binding assays and CLIP-confirmed Ndel1 binding with differentiation phenotypes","pmids":["24440524","24869935"],"confidence":"Medium","gaps":["MBNL1/MBNL2 division of labor not fully resolved","Single-lab phenotypes"]},{"year":2015,"claim":"Established MBNL1 as a 3'UTR-acting regulator of differentiation in vivo, controlling SRF and calcineurin transcripts to drive myofibroblast transformation and wound healing.","evidence":"RNA-IP, CRISPR editing of the Srf 3'UTR binding site, Mbnl1 KO mice in injury models","pmids":["26670661"],"confidence":"High","gaps":["Whether effect is via stabilization or decay not fully delineated","Effector pathway downstream of SRF not detailed"]},{"year":2015,"claim":"Expanded MBNL1's reach to RNA export antagonism with U2AF65 and to miRNA biogenesis through blocking Dicer processing of pre-miR-1307.","evidence":"Overexpression/fractionation for expHTT export; binding and Dicer-processing assays with Bcl2 luciferase readout","pmids":["26218986","25977444"],"confidence":"Medium","gaps":["Export antagonism rests on overexpression without endogenous validation","Scope of MBNL1-regulated miRNAs unknown"]},{"year":2018,"claim":"Defined post-translational and competitive controls of MBNL1: K63 polyubiquitination retains a cytoplasmic neurite-promoting pool, and rbFOX1 competes for CCUG repeats to release MBNL1 in DM2.","evidence":"Ubiquitination/fractionation and neurite assays; competition binding, foci-release, splicing correction and Drosophila rescue","pmids":["29490267","29789616"],"confidence":"High","gaps":["Ubiquitin ligase and DUB acting on MBNL1 not identified","rbFOX1 competition specific to CCUG, not CUG"]},{"year":2018,"claim":"Showed exon-7-containing isoforms mediate homodimerization, and that dominant-negative Δex7 isoforms compromise viability, implicating MBNL1 isoform balance in cancer.","evidence":"Splice-switching ASOs, dimerization, viability/migration assays, U2 complex knockdowns in prostate cancer","pmids":["30456384"],"confidence":"Medium","gaps":["Structural basis of dimerization not resolved","Single cancer context"]},{"year":2019,"claim":"Identified an upstream regulator of MBNL1 abundance, TRIM71, which degrades MBNL1 mRNA via 3'UTR hairpins to enforce fetal splicing in stem cells.","evidence":"RNA-IP, TRIM71 loss-of-function, splicing analysis, mRNA stability assays","pmids":["31371437"],"confidence":"Medium","gaps":["Other regulators of MBNL1 abundance in this context unknown","Single system"]},{"year":2020,"claim":"Established disease-promoting and tissue-development roles across leukemia, glioma, thymus, and muscle satellite cells, linking MBNL1 splicing/localization to proliferation and differentiation.","evidence":"shRNA/RNA-seq and in vivo leukemia models with inhibitor; hypoxia-induced export with orthotopic rescue; thymus KO transcriptomics; satellite-cell mTOR epistasis with rapamycin","pmids":["32398749","32928918","32332745","32683410"],"confidence":"High","gaps":["Direct splicing targets driving each phenotype not all validated","Mechanism of MBNL1's autophagy/mTOR control not biochemically defined"]},{"year":2021,"claim":"Linked MBNL1 loss to vascular disease via Abi1 mis-splicing that activates a Rac1-NOX1-ROS-KLF4 transdifferentiation cascade.","evidence":"Knockdown/overexpression, RT-PCR splicing, atherosclerosis tissue analysis and pathway inhibition","pmids":["33759281"],"confidence":"Medium","gaps":["Single isoform-pathway link","In vivo causality not established by MBNL1 genetics"]},{"year":2022,"claim":"Showed MBNL1 is itself phosphoregulated by CDK12 (stabilized via BUD13/m6A) to control glioblastoma vasculogenic mimicry.","evidence":"Co-IP, phospho-western, knockdowns, xenografts","pmids":["36463205"],"confidence":"Medium","gaps":["Phosphorylation sites and functional consequence on splicing not mapped","Kinase identity inferred from knockdown"]},{"year":2023,"claim":"Defined a compensatory circuit in which MBNL1 loss alters Mbnl2 exon 6/9 splicing to stabilize MBNL2 by removing a PEST degradation domain.","evidence":"RT-PCR splicing, fractionation, proteasome inhibition, stability assays, DM1 mouse validation","pmids":["36617982"],"confidence":"High","gaps":["Extent of compensation in human DM1 tissues unclear","Did not address other paralog cross-regulation"]},{"year":2024,"claim":"Established a cytoplasmic mRNA-stabilization role for MBNL1 in heart, where it stabilizes cell-cycle-inhibitor transcripts under MEIS1/calcineurin control to enforce cardiomyocyte maturity and tune regeneration.","evidence":"Cardiac-specific gain/loss-of-function mice, multi-omics, mRNA stability assays, surgical regeneration models","pmids":["38426339"],"confidence":"High","gaps":["Distinction between stabilization and decay targets not fully resolved","Upstream signal integration with localization controls unclear"]},{"year":null,"claim":"How MBNL1's separable RNA-binding and regulatory modules engage specific co-factors and decay machinery, and how localization, ubiquitination, and phosphorylation are integrated to partition its nuclear splicing versus cytoplasmic mRNA-fate activities, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structure of the regulatory module bound to effectors","Decay machinery recruited at 3'UTRs unidentified","Integration of post-translational controls not reconstituted"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,3,4,8,9,18,22]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,5,7,10,14]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[8,18,32]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,14,29]}],"localization":[{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[1,5,15,35]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[8,12,17,28]},{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[1,13,15]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[5,8,14,16]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[4,7,10,11]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,18,20,22,32]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,27,30,35]}],"complexes":["MBNL1 homodimer","stress granule RNP (with YB-1, DDX1)"],"partners":["U2AF65","PTBP1","DDX5","YB-1","DDX1","MBNL2","RBFOX2","TRIM71"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9NR56","full_name":"Muscleblind-like protein 1","aliases":["Triplet-expansion RNA-binding protein"],"length_aa":388,"mass_kda":41.8,"function":"Mediates pre-mRNA alternative splicing regulation. Acts either as activator or repressor of splicing on specific pre-mRNA targets. Inhibits cardiac troponin-T (TNNT2) pre-mRNA exon inclusion but induces insulin receptor (IR) pre-mRNA exon inclusion in muscle. Antagonizes the alternative splicing activity pattern of CELF proteins. Regulates the TNNT2 exon 5 skipping through competition with U2AF2. Inhibits the formation of the spliceosome A complex on intron 4 of TNNT2 pre-mRNA. Binds to the stem-loop structure within the polypyrimidine tract of TNNT2 intron 4 during spliceosome assembly. Binds to the 5'-YGCU(U/G)Y-3'consensus sequence. Binds to the IR RNA. Binds to expanded CUG repeat RNA, which folds into a hairpin structure containing GC base pairs and bulged, unpaired U residues. Together with RNA binding proteins RBPMS and RBFOX2, activates vascular smooth muscle cells alternative splicing events (PubMed:37548402). Regulates NCOR2 alternative splicing (By similarity)","subcellular_location":"Nucleus; Cytoplasm; Cytoplasmic granule","url":"https://www.uniprot.org/uniprotkb/Q9NR56/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MBNL1","classification":"Not Classified","n_dependent_lines":198,"n_total_lines":1208,"dependency_fraction":0.16390728476821192},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2},{"gene":"ESD","stoichiometry":0.2},{"gene":"FAM50A","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/MBNL1","total_profiled":1310},"omim":[{"mim_id":"620452","title":"AMYOTROPHIC LATERAL SCLEROSIS 28; ALS28","url":"https://www.omim.org/entry/620452"},{"mim_id":"619790","title":"OCULOPHARYNGODISTAL MYOPATHY 4; OPDM4","url":"https://www.omim.org/entry/619790"},{"mim_id":"618570","title":"TRIPARTITE MOTIF-CONTAINING PROTEIN 71; TRIM71","url":"https://www.omim.org/entry/618570"},{"mim_id":"618299","title":"LOW DENSITY LIPOPROTEIN RECEPTOR-RELATED PROTEIN 12; LRP12","url":"https://www.omim.org/entry/618299"},{"mim_id":"614092","title":"RAB-INTERACTING LYSOSOMAL PROTEIN-LIKE 1; RILPL1","url":"https://www.omim.org/entry/614092"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Enhanced","locations":[{"location":"Nucleoplasm","reliability":"Enhanced"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MBNL1"},"hgnc":{"alias_symbol":["KIAA0428","EXP42","EXP40","EXP35","EXP"],"prev_symbol":["MBNL"]},"alphafold":{"accession":"Q9NR56","domains":[{"cath_id":"3.30.1370.210","chopping":"11-96","consensus_level":"high","plddt":90.0309,"start":11,"end":96},{"cath_id":"3.30.1370.210","chopping":"180-252","consensus_level":"high","plddt":87.9701,"start":180,"end":252}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NR56","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NR56-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9NR56-F1-predicted_aligned_error_v6.png","plddt_mean":66.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MBNL1","jax_strain_url":"https://www.jax.org/strain/search?query=MBNL1"},"sequence":{"accession":"Q9NR56","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9NR56.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9NR56/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9NR56"}},"corpus_meta":[{"pmid":"16717059","id":"PMC_16717059","title":"Failure 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r(CGCUGU) revealed that both ZnF3 and ZnF4 target GC steps, with site-specific recognition mediated primarily by main-chain hydrogen bonds. The relative alignment of the two ZnF domains is dictated by the interdomain linker topology, resulting in an antiparallel orientation of bound GC elements and a chain-reversal loop trajectory for bound pre-mRNA targets.\",\n      \"method\": \"X-ray crystallography (crystal structure of ZnF3/4–RNA complex)\",\n      \"journal\": \"Nature structural & molecular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with atomic-resolution detail of RNA-protein contacts, single rigorous structural study\",\n      \"pmids\": [\"19043415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MBNL1 protein translocates from a predominantly cytoplasmic to nuclear distribution during a post-natal window (days 2–20 in mice), and this nuclear localization is required for a synchronized set of developmentally regulated splicing switches in skeletal muscle. In MBNL1 knockout mice these physiological splicing transitions fail, reproducing the splicing defects of DM1. Deficiency of MBNL2 does not reproduce this phenotype, establishing MBNL1 as the non-redundant factor for these post-natal transitions.\",\n      \"method\": \"Transgenic mouse model (CUG-repeat expression), MBNL1 knockout mice, RT-PCR splicing assays, immunofluorescence for subcellular localization\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — loss-of-function KO with defined cellular phenotype plus localization experiment, replicated in both mouse model and human DM1 tissue\",\n      \"pmids\": [\"16717059\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MBNL1 is the primary determinant of DM1 nuclear focus integrity and aberrant insulin receptor (IR) exon 11 splicing. siRNA-mediated knockdown of MBNL1 in normal myoblasts recapitulates aberrant IR splicing; rescue experiments in DM1 myoblasts showed that restoring MBNL1 function (but not suppressing CUG-BP) is the key event for correcting splicing. MBNL1 facilitates IR exon 11 inclusion in a dose-dependent manner, antagonized by CUG-BP.\",\n      \"method\": \"siRNA knockdown, overexpression rescue experiments, RT-PCR splicing assays in DM1 myoblasts\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain/loss-of-function with rescue, replicated across normal and DM1 cell systems\",\n      \"pmids\": [\"15546872\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"MBNL1 specifically binds CHHG (where H = A, U, or C) and CHG repeat RNA motifs, including CUG and CCUG repeats, as demonstrated by yeast three-hybrid assays with synthetic RNAs. MBNL1 does not bind canonical double-stranded CUG/CAG RNA, indicating preference for bulge-containing double-stranded RNA. Deletion analysis showed differences in RNA-binding ability among splice variants of MBNL1.\",\n      \"method\": \"Yeast three-hybrid assay, RNA-binding assays with synthetic RNAs, deletion mutagenesis\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro RNA-binding assay with systematic mutagenesis and sequence variation; single lab but multiple RNA substrates tested\",\n      \"pmids\": [\"14722159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"SELEX identified the YGCY (Y = pyrimidine) motif as the preferred RNA-binding element for MBNL1. Insertion of multiple YGCY motifs into an MBNL1-independent splicing reporter was sufficient to confer MBNL1-dependent regulation. MBNL1 regulates ATP2A1 exon 22 splicing through YGCY motifs. YGCY motifs are enriched in positions predicted to cause exon skipping or inclusion consistent with DM1 mis-splicing patterns.\",\n      \"method\": \"Doped SELEX, minigene splicing reporter assays, RT-PCR\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — SELEX for binding motif identification plus functional validation in splicing reporters with mutagenesis; single lab, two orthogonal methods\",\n      \"pmids\": [\"20071745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MBNL1 controls splicing of cardiac troponin T (cTNT) exon 5 by directly competing with the essential splicing factor U2AF65 for binding at the 3' end of intron 4. MBNL1 and U2AF65 bind mutually exclusive RNA secondary structures: MBNL1 binds a stem-loop form while U2AF65 binds the same region in a single-stranded form. When U2AF65 is displaced, U2 snRNP cannot be recruited and the downstream exon is skipped.\",\n      \"method\": \"In vitro RNA-binding competition assays, RNA secondary structure probing, splicing assays, mutagenesis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of competitive binding plus structure probing and mutational validation; multiple orthogonal methods\",\n      \"pmids\": [\"19470458\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MBNL1 promotes insulin receptor exon 11 inclusion by binding directly to a downstream intronic splicing enhancer within intron 11. RNA affinity chromatography identified MBNL1 as the binding factor; RNP immunoprecipitation confirmed in-cell binding to INSR RNA; overexpression or knockdown of Mbnl1 altered exon 11 inclusion levels; deletion of the intronic enhancer abolished MBNL1-mediated regulation.\",\n      \"method\": \"RNA affinity chromatography, RNP immunoprecipitation, minigene deletion mutagenesis, overexpression/knockdown\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA affinity pulldown, RIP, minigene deletion mutagenesis, and gain/loss-of-function; multiple orthogonal methods in single lab\",\n      \"pmids\": [\"20519504\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MBNL1 autoregulates its own pre-mRNA by binding within the 3' end of intron 4 to suppress inclusion of exon 5. Structure probing and footprinting showed the MBNL1 response element is primarily unstructured. The branch point is 141 nucleotides from the 3' splice site (non-canonical). Deletion of the MBNL1 response element abolished regulation and led to constitutive exon 5 inclusion.\",\n      \"method\": \"Minigene splicing assay, RNA structure probing, MBNL1 footprinting, branch-point mapping, deletion mutagenesis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro footprinting plus functional minigene mutagenesis; multiple orthogonal methods\",\n      \"pmids\": [\"21832083\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MBNL1 binds to 3' UTRs genome-wide and promotes accelerated mRNA decay for a broad set of transcripts, a function distinct from and in addition to its role in alternative splicing regulation. Position of MBNL1 binding on pre-mRNA influences whether it promotes exon inclusion or skipping.\",\n      \"method\": \"CLIP-seq (in vivo RNA-binding sites), exon array, RT-PCR, mRNA stability analysis\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide CLIP-seq plus expression array and RT-PCR validation; two orthogonal methods, single lab\",\n      \"pmids\": [\"22355723\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"A systematic analysis of MBNL1 binding to single-stranded RNAs showed that a single GC dinucleotide in a poly-U context is sufficient for MBNL1 binding; a second GC dinucleotide confers higher affinity; additional GC dinucleotides do not further enhance binding. The distance between the two GC dinucleotides can vary from 1 to 17 nucleotides for high-affinity binding, indicating conformational flexibility. Flanking sequence preference: U > C > A > G.\",\n      \"method\": \"Fluorescence-based RNA-binding assays, systematic RNA sequence variation\",\n      \"journal\": \"BMC molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro binding assay with systematic RNA sequence variation; single lab, single method\",\n      \"pmids\": [\"21548961\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Combinatorial mutagenesis of MBNL1 zinc finger domains showed that the two ZnF pairs have differential RNA-binding affinity and distinct splicing activities. Splicing activity profiles of ZnF mutants vary across different pre-mRNA substrates, revealing two distinct classes of MBNL1-regulated splicing events. For some transcripts, robust splicing activity is maintained even in the absence of detectable RNA binding, indicating RNA-binding-independent mechanisms.\",\n      \"method\": \"Combinatorial ZnF mutagenesis, splicing reporter assays, RNA-binding assays\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro mutagenesis combined with functional splicing assays across multiple substrates; multiple orthogonal methods\",\n      \"pmids\": [\"22890842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Functional domains of MBNL1 required for splicing activation and repression are separable from the zinc-finger RNA-binding domains. An 80-amino-acid segment downstream of the N-terminal zinc-finger pair contains core regulatory regions for both splicing activation (IR exon 11) and repression (cTNT exon 5). The MBNL1 response element for IR exon 11 consists of a cluster of three downstream binding sequences. Deletions of these regulatory regions abolished splicing regulation without preventing RNA binding.\",\n      \"method\": \"Sequential deletion mapping, minigene splicing reporter assays, RNA-binding assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — deletion mutagenesis with functional splicing assays and RNA-binding verification; multiple constructs and substrates\",\n      \"pmids\": [\"21109529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"MBNL1 colocalizes with YB-1 and DDX1 in cytoplasmic stress granules upon cellular stress. GST pulldown identified YB-1 and DDX1 as MBNL1-binding proteins; MBNL1 forms an RNP complex with these proteins. This provides evidence for a cytoplasmic role of MBNL1 in mRNA metabolism.\",\n      \"method\": \"GST pulldown, immunofluorescence colocalization, RNP complex assays\",\n      \"journal\": \"Journal of neuroscience research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — GST pulldown identification of binding partners plus colocalization; single lab, two complementary methods\",\n      \"pmids\": [\"18335541\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"The RNA helicase p68/DDX5 forms complexes on in vitro-transcribed CUG repeats, colocalizes with nuclear RNA foci in DM1 cells, and increases MBNL1 binding to both pathological CUG repeats and the cTNT pre-mRNA regulatory stem-loop. Mutations in the helicase core of p68 prevented both the stimulatory effect on MBNL1 binding and colocalization with CUG foci, suggesting that p68 remodels RNA secondary structure to facilitate MBNL1 binding.\",\n      \"method\": \"In vitro RNA-protein complex assembly, immunofluorescence colocalization, MBNL1 binding assays, helicase-core mutagenesis, splicing reporter assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (binding assay, colocalization, mutagenesis, splicing readout) in single lab\",\n      \"pmids\": [\"22156369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MBNL1 binds UGC/CUG clusters in Tpm1 (alpha-tropomyosin) pre-mRNA and cooperates with PTB to repress exon 3 splicing in smooth muscle cells. The N-terminal region of MBNL1 containing all four CCCH zinc fingers is sufficient for repression. MBNL1 makes a direct protein-protein interaction with PTB, and RNA binding by MBNL1 promotes this interaction by inducing a conformational change. Single-molecule analysis showed MBNL1 binding sites increase PTB occupancy at its own sites.\",\n      \"method\": \"Minigene splicing reporter, pulldown (protein-protein interaction), single-molecule FRET/TIRF, RNA footprinting\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of protein-protein interaction, single-molecule analysis, and minigene mutagenesis; multiple orthogonal methods\",\n      \"pmids\": [\"23511971\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MBNL1 nuclear localization is controlled by two classes of nuclear localization signals (NLS): a classical bipartite NLS and a novel conformational NLS. Alternative splicing of exon 7 acts as a switch between these NLS types and couples MBNL1 splicing activity to intracellular localization. Nuclear MBNL1 promotes nuclear retention of mutant CUG/CAG-repeat-containing RNA and represses expression of homopolymeric proteins produced through RAN translation from these retained RNAs.\",\n      \"method\": \"NLS domain mapping, exon 7 splicing manipulation, immunofluorescence/subcellular fractionation, RAN translation reporter assays\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — NLS mapping with functional localization assay, splicing switch experiments, and RAN translation readout; multiple methods\",\n      \"pmids\": [\"25274774\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MBNL1 exon 1 autoregulation: CLIP-seq revealed MBNL1 binds its own exon 1 (encoding the 5'UTR major portion and amino-terminal region). MBNLs induce skipping of exon 1 from precursor MBNL1 mRNA. Exon 1 exclusion impacts polysome association and translation. The exon 1-deficient protein isoform (lacking the first two zinc fingers) is highly unstable and has severely compromised splicing activity. MBNL1 can be transcribed from three different promoters, and transcription initiation site determines the mode of exon 1 regulation.\",\n      \"method\": \"CLIP-seq, minigene/splicing assays, polysome profiling, protein stability assays, promoter analysis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CLIP-seq plus functional assays (polysome profiling, stability, splicing); multiple orthogonal methods, single lab\",\n      \"pmids\": [\"27903900\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"K63-linked polyubiquitination of MBNL1 is required for its cytoplasmic localization and function in promoting neurite outgrowth. Expanded CUG RNA induces deubiquitination of cytoplasmic MBNL1, causing nuclear translocation and morphological impairment. Inhibiting K63-linked polyubiquitin chain degradation ameliorated morphological defects in DM1 neurons. The cytoplasmic (but not nuclear) MBNL1 isoform promotes neurite morphogenesis.\",\n      \"method\": \"Ubiquitination assays, subcellular fractionation, immunofluorescence, neurite morphology quantification, pharmacological inhibition of deubiquitination\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ubiquitination assays with fractionation and functional phenotypic rescue; multiple orthogonal methods\",\n      \"pmids\": [\"29490267\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MBNL1 directly binds to and regulates a network of differentiation-specific transcripts including SRF (serum response factor) and calcineurin Aβ 3'UTRs to promote myofibroblast differentiation. CRISPR-Cas9 editing of the MBNL1-binding site within the Srf 3'UTR impaired myofibroblast differentiation. Loss of Mbnl1 in mice abrogated myofibroblast transformation and impaired fibrotic wound healing after myocardial infarction and dermal injury.\",\n      \"method\": \"RNA-IP (direct binding), CRISPR-Cas9 mutagenesis of binding site, mouse KO models (myocardial infarction, dermal injury), genome-wide screen\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — CRISPR functional validation of binding site, in vivo KO phenotype, and RNA-IP; multiple orthogonal methods with in vivo confirmation\",\n      \"pmids\": [\"26670661\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MBNL1 overexpression increases nuclear retention of full-length expanded HTT (expHTT) RNA and decreases cytoplasmic expHTT protein expression. U2AF65 has the opposite effect, decreasing expHTT nuclear retention and increasing cytoplasmic expHTT protein, suggesting MBNL1 and U2AF65 antagonistically regulate nuclear export of expHTT RNA.\",\n      \"method\": \"Overexpression studies, subcellular fractionation, immunofluorescence, western blotting\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Weak — overexpression with fractionation; single lab, limited mechanistic follow-up\",\n      \"pmids\": [\"26218986\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"MBNL1 and RBFOX2 cooperatively control a splicing programme involved in late mesoderm differentiation during reprogramming to iPSCs and redifferentiation. MBNL1 and RBFOX2 co-regulate at least 10 conserved alternative splicing events (including PLOD2, ATP2A1, ITGA6, MARK2, and others), and their combined activity is required for differentiated splicing patterns in vertebrates.\",\n      \"method\": \"High-throughput RT-PCR during iPSC induction and redifferentiation, knockdown of individual splicing factors\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — high-throughput splicing profiling with knockdown validation; single study but large-scale systematic approach\",\n      \"pmids\": [\"24048253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MBNL1 and MBNL2 act synergistically as enhancers of Tau exon 2 inclusion. An intronic region 250 nucleotides downstream of Tau exon 2 contains cis-regulatory splicing enhancers that directly bind MBNL1. Interaction of both MBNL1 and MBNL2 is required to fully reverse Tau exon 2 mis-splicing induced by long CUG repeats.\",\n      \"method\": \"Tau minigene reporter assays, MBNL1 direct binding assay, siRNA knockdown, overexpression\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding plus functional minigene with mutagenesis and combinatorial knockdown; single lab\",\n      \"pmids\": [\"24440524\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MBNL1 knockdown in murine fetal liver erythroid progenitors caused a strong block in erythroid terminal differentiation and disrupted developmentally regulated exon skipping of Ndel1 mRNA. MBNL1 directly binds Ndel1 mRNA (confirmed by CLIP). Ndel1 exon skipping regulated by MBNL1 is critical for erythroid terminal proliferation.\",\n      \"method\": \"shRNA knockdown, erythroid differentiation assay, CLIP, RT-PCR splicing analysis\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CLIP-confirmed direct binding plus loss-of-function with defined differentiation phenotype; single lab\",\n      \"pmids\": [\"24869935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Pseudouridine (Ψ) modification of uridines in MBNL1-binding RNAs inhibits MBNL1 binding by reducing RNA flexibility. Ψ modification of minimally structured YGCY-containing RNA more robustly inhibited MBNL1 binding than modification of CCUG repeats (which can only be modified at one pyrimidine position per motif). Molecular dynamics simulations confirmed that reduced RNA flexibility underlies the reduced binding.\",\n      \"method\": \"Fluorescence polarization binding assays, pseudouridine-modified RNA synthesis, molecular dynamics simulations\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro binding assay with chemically modified RNAs and MD simulations; single lab, two orthogonal methods\",\n      \"pmids\": [\"28130447\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"rbFOX1 binds expanded CCUG RNA repeats (DM2) but not expanded CUG repeats (DM1), and competes with MBNL1 for binding to CCUG expanded repeats. Overexpression of rbFOX1 partly releases MBNL1 from CCUG RNA foci in DM2 muscle cells and corrects MBNL1-dependent alternative splicing alterations.\",\n      \"method\": \"RNA-binding assays (competition), immunofluorescence (foci), alternative splicing RT-PCR, Drosophila genetic rescue model\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — competitive binding assays, cell-based foci release, splicing correction, and in vivo Drosophila rescue; multiple orthogonal methods\",\n      \"pmids\": [\"29789616\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"MBNL1 splicing isoforms containing exon 7 (ex7) are required for MBNL1 homodimerization. Isoforms lacking ex7 (MBNL1 Δex7) act as dominant negative proteins: splice-switching antisense oligonucleotides inducing ex7 exclusion caused DNA damage and inhibited cell viability and migration in prostate cancer cells. Components of the U2 splicing complex (SF3B1, SF3A1, PHF5A) are required for efficient ex7 inclusion.\",\n      \"method\": \"Antisense oligonucleotides for splice switching, siRNA, dimerization assays, viability/migration assays, SF3B1/SF3A1/PHF5A knockdown\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — splice-switching ASOs with functional phenotyping and dimerization assay; single lab, multiple methods\",\n      \"pmids\": [\"30456384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"TRIM71 represses MBNL1 expression in mouse embryonic stem cells by binding hairpin motifs in the MBNL1 3'UTR, predominantly causing MBNL1 mRNA degradation. Through MBNL1 repression, TRIM71 promotes embryonic (fetal) splicing patterns, thereby regulating stem cell differentiation state.\",\n      \"method\": \"RNA-IP (TRIM71-MBNL1 mRNA interaction), TRIM71 loss-of-function, alternative splicing analysis, target mRNA stability assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA-IP showing direct 3'UTR interaction plus epistasis (TRIM71 → MBNL1 → splicing); single lab\",\n      \"pmids\": [\"31371437\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MBNL1 regulates alternative splicing (predominantly intron exclusion) of DOT1L and SETD1A transcripts in MLL-rearranged leukemia cells. Loss of MBNL1 significantly impairs propagation of murine and human MLL-rearranged leukemia in vitro and in vivo. A small molecule MBNL1 inhibitor selectively kills leukemic cells.\",\n      \"method\": \"shRNA knockdown, RNA-seq (transcriptomic profiling), in vivo mouse leukemia model, small molecule inhibitor treatment\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — transcriptomic profiling of splicing targets with in vitro and in vivo loss-of-function and pharmacological validation; multiple methods\",\n      \"pmids\": [\"32398749\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MBNL1 inhibits autophagy via the mTOR pathway to promote proliferation of skeletal muscle satellite cells. In DM1 satellite cells, reduced cytoplasmic MBNL1 leads to elevated autophagy and reduced mTOR phosphorylation. MBNL1 overexpression increased mTOR phosphorylation and enhanced proliferative capacity; this effect was abolished by rapamycin (mTOR inhibitor), placing MBNL1 upstream of mTOR in the autophagy-regulatory pathway.\",\n      \"method\": \"iPSC-derived satellite cells, TALEN gene editing, MBNL1 overexpression, rapamycin inhibition, western blotting for mTOR phosphorylation, autophagy markers\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epistasis established by pharmacological mTOR inhibition rescuing MBNL1 overexpression effect; single lab with multiple lines\",\n      \"pmids\": [\"32683410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MBNL1 binds to the terminal loop of C-allelic pre-miR-1307 at a 'UGCUGC' motif and blocks Dicer processing, resulting in downregulation of mature miR-1307 expression. This reduces miR-1307-mediated repression of its target Bcl2. Both C-allelic and T-allelic pre-miR-1307 are bound by MBNL1.\",\n      \"method\": \"RNA-protein binding assays, Dicer processing assay, miRNA expression measurement, luciferase reporter for Bcl2\",\n      \"journal\": \"Carcinogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding shown and functional consequence (Dicer blocking) demonstrated; single lab\",\n      \"pmids\": [\"25977444\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss of MBNL1 induces aberrant splicing of the Abi1 gene, specifically promoting the Abi1-Δe10 isoform in vascular smooth muscle cells. Abi1-Δe10 activates Rac1 independently of upstream stimulation, triggering the Rac1-NOX1-ROS pathway and increasing KLF4 transcription factor expression, which drives VSMC macrophage-like transdifferentiation during atherogenesis.\",\n      \"method\": \"siRNA knockdown, overexpression, RT-PCR splicing assay, in vivo atherosclerosis tissue analysis, pathway inhibition assays\",\n      \"journal\": \"Cell proliferation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — splicing mechanism linked to downstream signaling pathway via isoform-specific functional assays; single lab\",\n      \"pmids\": [\"33759281\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Loss of MBNL1 increases inclusion of Mbnl2 exon 6 and exon 9. Mbnl2 exon 6 inclusion increases MBNL2 nuclear translocation. Mbnl2 exon 9 encodes a PEST domain that targets the protein for proteasomal degradation; exon 9 exclusion (caused by loss of MBNL1) removes this PEST domain and stabilizes MBNL2, providing a compensatory mechanism whereby MBNL1 loss upregulates MBNL2 protein levels.\",\n      \"method\": \"RT-PCR splicing analysis, subcellular fractionation, protein stability assays, proteasome inhibition, DM1 mouse model validation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic PEST domain identification with proteasome assay, fractionation, and in vivo DM1 model confirmation; multiple methods\",\n      \"pmids\": [\"36617982\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MBNL1 is regulated by the MEIS1/calcineurin signaling axis and stabilizes adult myocyte mRNAs (including cell cycle inhibitor transcripts) to maintain cardiomyocyte maturity and suppress proliferation. Early MBNL1 overexpression prematurely transitions cardiomyocytes to hypertrophic growth and hypoplasia; MBNL1 deletion increases cardiomyocyte cell cycle entry and proliferation through altered cell cycle inhibitor transcript stability. MBNL1 dosage tunes the neonatal cardiac regeneration window.\",\n      \"method\": \"Cardiac-specific MBNL1 gain/loss-of-function mouse models, multi-omics, mRNA stability assays, histology, surgical heart regeneration models\",\n      \"journal\": \"Circulation\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — in vivo cardiac-specific KO and OE with multi-omics and biochemical mRNA stability assays; multiple orthogonal methods with in vivo phenotype\",\n      \"pmids\": [\"38426339\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"CDK12 phosphorylates MBNL1, and BUD13 stabilizes CDK12 mRNA via m6A methylation. CDK12-mediated MBNL1 phosphorylation regulates vasculogenic mimicry (VM) formation in glioblastoma cells. Knockdown of BUD13 or CDK12 or overexpression of MBNL1 inhibited VM formation.\",\n      \"method\": \"Co-IP, western blotting for phosphorylation, siRNA knockdown, in vitro kinase assay (implied by phosphorylation data), xenograft tumor model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — phosphorylation shown and functional consequence demonstrated; kinase identity established by knockdown; single lab\",\n      \"pmids\": [\"36463205\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Loss of MBNL1 in the thymus leads to postnatal thymic hyperplasia with thymocyte accumulation in Mbnl1 129S1 knockout mice. MBNL1 is required for normal thymus development and function, with its loss causing extensive mis-splicing events including TCF/LEF family transcription factor transcripts.\",\n      \"method\": \"Mbnl1 knockout mouse model, RNA-seq transcriptome analysis, histology\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO with defined cellular phenotype plus transcriptomic validation; single lab\",\n      \"pmids\": [\"32332745\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In glioblastoma, hypoxia causes export of MBNL1 from the nucleus, resulting in loss of MBNL1 splicing activity and promotion of fetal/stem-like alternative splicing patterns. Forced expression of a constitutively active (nuclear) MBNL1 isoform inhibited glioma stem cell self-renewal and tumor initiation in orthotopic models and dramatically inhibited tumor progression.\",\n      \"method\": \"Subcellular fractionation/immunofluorescence under hypoxia, splicing assays, orthotopic xenograft models, forced MBNL1 expression\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — hypoxia-induced localization change linked to splicing phenotype with in vivo orthotopic rescue; single lab\",\n      \"pmids\": [\"32928918\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MBNL1 is a CCCH zinc-finger RNA-binding protein that recognizes YGCY (GC-step-containing pyrimidine-rich) motifs in pre-mRNA and 3'UTR sequences; its tandem ZnF pairs make direct base-specific contacts (established by crystal structure), and binding is enhanced by RNA flexibility. In the nucleus, MBNL1 acts as a position-dependent alternative splicing regulator—repressing or activating exon inclusion by competing with U2AF65 for splice-site access, recruiting co-repressors such as PTB, and autoregulating its own exon 1 and exon 5 splicing; nuclear localization is controlled by alternative splicing of exon 7 (toggling between bipartite and conformational NLS types) and by K63-linked polyubiquitination that retains a cytoplasmic pool. In the cytoplasm, MBNL1 binds 3'UTRs to promote mRNA decay and stabilize specific transcripts (including cell cycle inhibitor mRNAs in cardiomyocytes), associates with YB-1 and DDX1 in stress granules, and is regulated upstream by CDK12-mediated phosphorylation and TRIM71-mediated mRNA degradation. Sequestration of MBNL1 in nuclear CUG/CCUG-repeat RNA foci in myotonic dystrophy ablates these activities, causing failure of post-natal splicing transitions in muscle, heart, brain, thymus, and erythroid cells, and in this context the RNA helicase p68/DDX5 acts as a modifier by remodeling RNA structure to enhance MBNL1 binding to its targets.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MBNL1 is a CCCH tandem-zinc-finger RNA-binding protein that governs post-natal alternative-splicing transitions and 3'UTR-directed mRNA fate decisions across muscle, heart, brain, thymus, and erythroid lineages [#1, #8, #32]. Its zinc fingers recognize a YGCY/GC-step element: crystallography of ZnF3/4 bound to r(CGCUGU) showed both fingers target GC steps through main-chain hydrogen bonds in an antiparallel arrangement [#0], SELEX defined YGCY as the preferred motif sufficient to confer MBNL1-dependent splicing regulation [#4], and a single GC dinucleotide in a pyrimidine-rich context with flexible spacing is sufficient for binding [#9]; binding requires RNA flexibility, since pseudouridine modification that rigidifies the RNA inhibits it [#23]. In the nucleus MBNL1 acts as a position-dependent splicing regulator that competes with U2AF65 for splice-site access to block U2 snRNP recruitment [#5], cooperates with PTB through an RNA-induced protein-protein interaction to repress exons [#14], and autoregulates its own pre-mRNA at exon 1 and exon 5 [#7, #16] as well as MBNL2 isoform output [#31]. RNA-binding and splicing-regulatory functions are separable: a regulatory segment downstream of the N-terminal zinc fingers drives activation and repression independently of binding [#10, #11]. MBNL1 nuclear access is set by alternative splicing of exon 7, which toggles between bipartite and conformational NLS types [#15], and by K63-linked polyubiquitination that retains a cytoplasmic neurite-promoting pool [#17]. A second, cytoplasmic function involves direct 3'UTR binding to accelerate decay of many transcripts [#8] or to stabilize specific mRNAs, including SRF and calcineurin transcripts driving myofibroblast differentiation [#18] and cell-cycle-inhibitor transcripts maintaining cardiomyocyte maturity [#32]. In myotonic dystrophy, MBNL1 is sequestered into nuclear CUG/CCUG-repeat RNA foci—it binds bulge-containing repeat RNA rather than canonical duplex [#3], and the helicase p68/DDX5 remodels repeat and target RNA structure to enhance MBNL1 binding [#13]—causing failure of the developmental splicing transitions that depend non-redundantly on MBNL1 [#1, #2]. MBNL1 dosage and localization further control cancer phenotypes in glioma, MLL-rearranged leukemia, and prostate cancer [#27, #35, #25].\",\n  \"teleology\": [\n    {\n      \"year\": 2004,\n      \"claim\": \"Established that MBNL1 is the causal effector of DM1 mis-splicing by showing its loss recapitulates and its restoration rescues aberrant insulin receptor splicing, defining the disease-relevant function.\",\n      \"evidence\": \"siRNA knockdown and overexpression rescue with RT-PCR splicing assays in normal and DM1 myoblasts\",\n      \"pmids\": [\"15546872\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not define the RNA element or mechanism of exon recognition\", \"Restricted to a single splicing target\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Defined the RNA preference underlying repeat sequestration by showing MBNL1 binds CHHG/CHG and bulge-containing CUG/CCUG repeats but not canonical duplex RNA, explaining its capture in repeat foci.\",\n      \"evidence\": \"Yeast three-hybrid and RNA-binding assays with synthetic RNAs and deletion mutagenesis\",\n      \"pmids\": [\"14722159\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vitro motif definition not yet linked to genome-wide endogenous targets\", \"Did not resolve atomic basis of recognition\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Showed MBNL1 nuclear translocation during a defined post-natal window drives developmental splicing switches and is non-redundant with MBNL2, establishing its physiological role and the cellular basis of DM1.\",\n      \"evidence\": \"MBNL1 and MBNL2 knockout mice, CUG-repeat transgenics, immunofluorescence localization and RT-PCR\",\n      \"pmids\": [\"16717059\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism controlling the localization switch not defined\", \"Did not identify the full target transcript network\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Provided the atomic basis of RNA recognition, showing both ZnF3 and ZnF4 contact GC steps via main-chain hydrogen bonds with linker-dictated antiparallel geometry.\",\n      \"evidence\": \"X-ray crystal structure of the ZnF3/4–r(CGCUGU) complex\",\n      \"pmids\": [\"19043415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Only one of the two ZnF pairs structurally resolved\", \"Does not explain RNA-binding-independent regulatory activity\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Defined a direct mechanism for splicing repression: MBNL1 competes with U2AF65 for a mutually exclusive RNA structure, blocking U2 snRNP recruitment.\",\n      \"evidence\": \"In vitro competition binding, RNA structure probing, splicing assays and mutagenesis on cTNT exon 5\",\n      \"pmids\": [\"19470458\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Competition shown for one transcript\", \"Did not address how position dictates activation versus repression\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined the consensus YGCY binding motif and showed it is sufficient to confer MBNL1-dependent regulation, plus that a single flexibly-spaced GC dinucleotide drives binding.\",\n      \"evidence\": \"Doped SELEX, minigene reporters, and fluorescence-based binding with systematic sequence variation\",\n      \"pmids\": [\"20071745\", \"21548961\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Affinity rules not connected to in vivo occupancy\", \"Did not address binding to structured repeat RNA\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Separated RNA-binding from regulatory activity, mapping the two ZnF pairs to distinct splicing classes and a downstream 80-aa segment as the core activation/repression module independent of binding.\",\n      \"evidence\": \"Combinatorial ZnF and sequential deletion mutagenesis with splicing reporters and RNA-binding assays\",\n      \"pmids\": [\"22890842\", \"21109529\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Effectors recruited by the regulatory segment not identified\", \"Mechanism of binding-independent activity unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identified the intronic enhancer mechanism for splicing activation, showing MBNL1 binds downstream of INSR exon 11 to promote its inclusion.\",\n      \"evidence\": \"RNA affinity chromatography, RNP-IP, minigene deletion, gain/loss-of-function\",\n      \"pmids\": [\"20519504\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify co-factors enabling activation\", \"Single transcript context\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Demonstrated autoregulation, showing MBNL1 binds an unstructured element in its own intron 4 to suppress exon 5 inclusion, establishing a feedback loop on its splicing output.\",\n      \"evidence\": \"Minigene assays, RNA structure probing, footprinting, branch-point mapping\",\n      \"pmids\": [\"21832083\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological consequence of exon 5 toggling not addressed here\", \"Did not link to protein function\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Revealed a cytoplasmic role by placing MBNL1 in stress-granule RNP complexes with YB-1 and DDX1.\",\n      \"evidence\": \"GST pulldown, immunofluorescence colocalization, RNP complex assays\",\n      \"pmids\": [\"18335541\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No reciprocal validation of interactions\", \"Functional consequence of granule association undefined\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identified p68/DDX5 as a structural modifier that remodels RNA to enhance MBNL1 binding to both pathological CUG repeats and target pre-mRNA.\",\n      \"evidence\": \"In vitro complex assembly, colocalization, helicase-core mutagenesis, splicing reporters\",\n      \"pmids\": [\"22156369\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Genome-wide scope of DDX5 modulation unknown\", \"Direct MBNL1-DDX5 contact not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Established the second major MBNL1 function—3'UTR binding genome-wide to accelerate mRNA decay—and showed binding position dictates exon inclusion versus skipping.\",\n      \"evidence\": \"CLIP-seq, exon arrays, RT-PCR, mRNA stability analysis\",\n      \"pmids\": [\"22355723\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Decay machinery recruited by MBNL1 not identified\", \"Did not separate decay targets from stabilized targets\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined a cooperative repression mechanism in which RNA binding induces an MBNL1 conformational change that recruits PTB and increases its occupancy.\",\n      \"evidence\": \"Minigene reporters, protein-protein pulldown, single-molecule FRET/TIRF, footprinting on Tpm1\",\n      \"pmids\": [\"23511971\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generality of PTB cooperation across targets unknown\", \"Conformational change not structurally resolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Placed MBNL1 in a combinatorial splicing program with RBFOX2 controlling mesoderm differentiation, broadening its role beyond muscle.\",\n      \"evidence\": \"High-throughput RT-PCR during iPSC induction/redifferentiation with knockdowns\",\n      \"pmids\": [\"24048253\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of co-regulation not resolved\", \"Direct binding not demonstrated for all co-targets\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Resolved how MBNL1 localization is encoded, identifying exon-7 splicing as a switch between bipartite and conformational NLS types that couples localization to activity and to repeat-RNA retention.\",\n      \"evidence\": \"NLS mapping, exon 7 manipulation, fractionation, RAN-translation reporters\",\n      \"pmids\": [\"25274774\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Upstream control of exon 7 choice not defined here\", \"Did not address cytoplasmic functions of exon-7 isoforms\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Extended MBNL1 splicing regulation to neuronal Tau exon 2 and to erythroid differentiation via Ndel1, showing direct binding underlies lineage-specific programs.\",\n      \"evidence\": \"Tau minigene/binding assays and CLIP-confirmed Ndel1 binding with differentiation phenotypes\",\n      \"pmids\": [\"24440524\", \"24869935\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"MBNL1/MBNL2 division of labor not fully resolved\", \"Single-lab phenotypes\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Established MBNL1 as a 3'UTR-acting regulator of differentiation in vivo, controlling SRF and calcineurin transcripts to drive myofibroblast transformation and wound healing.\",\n      \"evidence\": \"RNA-IP, CRISPR editing of the Srf 3'UTR binding site, Mbnl1 KO mice in injury models\",\n      \"pmids\": [\"26670661\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether effect is via stabilization or decay not fully delineated\", \"Effector pathway downstream of SRF not detailed\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Expanded MBNL1's reach to RNA export antagonism with U2AF65 and to miRNA biogenesis through blocking Dicer processing of pre-miR-1307.\",\n      \"evidence\": \"Overexpression/fractionation for expHTT export; binding and Dicer-processing assays with Bcl2 luciferase readout\",\n      \"pmids\": [\"26218986\", \"25977444\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Export antagonism rests on overexpression without endogenous validation\", \"Scope of MBNL1-regulated miRNAs unknown\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined post-translational and competitive controls of MBNL1: K63 polyubiquitination retains a cytoplasmic neurite-promoting pool, and rbFOX1 competes for CCUG repeats to release MBNL1 in DM2.\",\n      \"evidence\": \"Ubiquitination/fractionation and neurite assays; competition binding, foci-release, splicing correction and Drosophila rescue\",\n      \"pmids\": [\"29490267\", \"29789616\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ubiquitin ligase and DUB acting on MBNL1 not identified\", \"rbFOX1 competition specific to CCUG, not CUG\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed exon-7-containing isoforms mediate homodimerization, and that dominant-negative Δex7 isoforms compromise viability, implicating MBNL1 isoform balance in cancer.\",\n      \"evidence\": \"Splice-switching ASOs, dimerization, viability/migration assays, U2 complex knockdowns in prostate cancer\",\n      \"pmids\": [\"30456384\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural basis of dimerization not resolved\", \"Single cancer context\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Identified an upstream regulator of MBNL1 abundance, TRIM71, which degrades MBNL1 mRNA via 3'UTR hairpins to enforce fetal splicing in stem cells.\",\n      \"evidence\": \"RNA-IP, TRIM71 loss-of-function, splicing analysis, mRNA stability assays\",\n      \"pmids\": [\"31371437\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Other regulators of MBNL1 abundance in this context unknown\", \"Single system\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Established disease-promoting and tissue-development roles across leukemia, glioma, thymus, and muscle satellite cells, linking MBNL1 splicing/localization to proliferation and differentiation.\",\n      \"evidence\": \"shRNA/RNA-seq and in vivo leukemia models with inhibitor; hypoxia-induced export with orthotopic rescue; thymus KO transcriptomics; satellite-cell mTOR epistasis with rapamycin\",\n      \"pmids\": [\"32398749\", \"32928918\", \"32332745\", \"32683410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct splicing targets driving each phenotype not all validated\", \"Mechanism of MBNL1's autophagy/mTOR control not biochemically defined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Linked MBNL1 loss to vascular disease via Abi1 mis-splicing that activates a Rac1-NOX1-ROS-KLF4 transdifferentiation cascade.\",\n      \"evidence\": \"Knockdown/overexpression, RT-PCR splicing, atherosclerosis tissue analysis and pathway inhibition\",\n      \"pmids\": [\"33759281\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single isoform-pathway link\", \"In vivo causality not established by MBNL1 genetics\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Showed MBNL1 is itself phosphoregulated by CDK12 (stabilized via BUD13/m6A) to control glioblastoma vasculogenic mimicry.\",\n      \"evidence\": \"Co-IP, phospho-western, knockdowns, xenografts\",\n      \"pmids\": [\"36463205\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Phosphorylation sites and functional consequence on splicing not mapped\", \"Kinase identity inferred from knockdown\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined a compensatory circuit in which MBNL1 loss alters Mbnl2 exon 6/9 splicing to stabilize MBNL2 by removing a PEST degradation domain.\",\n      \"evidence\": \"RT-PCR splicing, fractionation, proteasome inhibition, stability assays, DM1 mouse validation\",\n      \"pmids\": [\"36617982\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Extent of compensation in human DM1 tissues unclear\", \"Did not address other paralog cross-regulation\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Established a cytoplasmic mRNA-stabilization role for MBNL1 in heart, where it stabilizes cell-cycle-inhibitor transcripts under MEIS1/calcineurin control to enforce cardiomyocyte maturity and tune regeneration.\",\n      \"evidence\": \"Cardiac-specific gain/loss-of-function mice, multi-omics, mRNA stability assays, surgical regeneration models\",\n      \"pmids\": [\"38426339\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Distinction between stabilization and decay targets not fully resolved\", \"Upstream signal integration with localization controls unclear\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MBNL1's separable RNA-binding and regulatory modules engage specific co-factors and decay machinery, and how localization, ubiquitination, and phosphorylation are integrated to partition its nuclear splicing versus cytoplasmic mRNA-fate activities, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No structure of the regulatory module bound to effectors\", \"Decay machinery recruited at 3'UTRs unidentified\", \"Integration of post-translational controls not reconstituted\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 3, 4, 8, 9, 18, 22]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 5, 7, 10, 14]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [8, 18, 32]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 14, 29]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 5, 15, 35]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [8, 12, 17, 28]},\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [1, 13, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [5, 8, 14, 16]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [4, 7, 10, 11]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 18, 20, 22, 32]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 27, 30, 35]}\n    ],\n    \"complexes\": [\n      \"MBNL1 homodimer\",\n      \"stress granule RNP (with YB-1, DDX1)\"\n    ],\n    \"partners\": [\n      \"U2AF65\",\n      \"PTBP1\",\n      \"DDX5\",\n      \"YB-1\",\n      \"DDX1\",\n      \"MBNL2\",\n      \"RBFOX2\",\n      \"TRIM71\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":8,"faith_total":8,"faith_pct":100.0}}