{"gene":"MSI2","run_date":"2026-06-10T02:59:51","timeline":{"discoveries":[{"year":2003,"finding":"MSI2 encodes an RNA-binding protein with two RNA recognition motif (RRM) domains; a chromosomal translocation t(7;17)(p15;q23) creates an in-frame MSI2/HOXA9 fusion transcript retaining both RRM domains of MSI2 fused to the homeobox domain of HOXA9, identified at disease progression of CML.","method":"Molecular cloning, RT-PCR, sequence analysis of translocation breakpoints","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct molecular characterization of fusion transcript by multiple methods, single lab","pmids":["12649177"],"is_preprint":false},{"year":2010,"finding":"Msi2 shRNA-mediated depletion in mouse HSCs significantly impaired hematopoietic stem cell repopulation in vivo and promoted differentiation in vitro; conversely, Msi2 overexpression enhanced HSC self-renewal, establishing MSI2 as a positive regulator of HSC self-renewal.","method":"In vivo RNAi screen, shRNA knockdown, retroviral overexpression, competitive repopulation assays, gene expression profiling","journal":"Cell stem cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal loss- and gain-of-function approaches in vivo and in vitro, replicated across conditions","pmids":["20621054"],"is_preprint":false},{"year":2015,"finding":"MSI2 acts as a pleiotropic post-transcriptional repressor of intestinal tumour suppressors including Lrig1, Bmpr1a, Cdkn1a, and Pten; MSI2 gain-of-function in intestinal epithelium phenocopied APC loss in a Wnt-independent manner, and PDK-AKT-mTORC1 inhibition rescued its oncogenic effects.","method":"Drug-inducible mouse overexpression model, transcriptome-wide RNA-binding analysis (PAR-CLIP/CLIP), loss-of-function experiments, pharmacological rescue","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — transcriptome-wide RNA binding mapped, in vivo gain-of-function, pharmacological epistasis, multiple orthogonal methods","pmids":["25774828"],"is_preprint":false},{"year":2016,"finding":"MSI2 directly regulates translation of TGFβR1 and SMAD3 mRNAs to support TGF-β signaling and promote NSCLC metastasis; MSI2 depletion induced claudin tight-junction proteins (CLDN3, CLDN5, CLDN7) and overexpression of TGFβRI rescued the invasion deficit caused by MSI2 loss.","method":"shRNA depletion in multiple cell lines, rescue overexpression, invasion/metastasis assays in vitro and in vivo, Western blot, gene expression analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — epistasis rescue experiment, multiple cell lines, in vivo metastasis, multiple orthogonal methods","pmids":["27274057"],"is_preprint":false},{"year":2016,"finding":"MSI2 expression is required for maintaining activated MDS hematopoietic stem and progenitor cells; conditional Msi2 deletion in a mouse MDS model caused rapid loss of MDS HSPCs and reversed clinical MDS features, while inducible MSI2 overexpression drove myeloid disease progression.","method":"Conditional knockout mouse, inducible overexpression mouse, flow cytometry, gene expression profiling","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal conditional KO and inducible OE in vivo mouse models, disease phenotype reversal, multiple orthogonal readouts","pmids":["26898884"],"is_preprint":false},{"year":2017,"finding":"MSI2 physically interacts with SYNCRIP (and other RBPs) through shared mRNA targets; proteomic analysis of the MSI2-interacting RBP network identified SYNCRIP as required for in vivo leukemia; SYNCRIP maintains HOXA9 translation and MSI2 or HOXA9 overexpression rescued SYNCRIP depletion effects.","method":"Proteomic interactome analysis (mass spectrometry), shRNA functional screen, gene expression profiling, rescue overexpression, in vivo leukemia assays","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — proteomic interactome mapping, in vivo functional screen, epistasis rescue, multiple orthogonal methods","pmids":["28436985"],"is_preprint":false},{"year":2017,"finding":"MSI2 protein directly binds FLT3 mRNA transcripts as shown by RNA immunoprecipitation; MSI2 loss leads to downregulation of FLT3 receptor expression in AML and CML blast crisis cells and impairs clonogenic growth, establishing post-transcriptional regulation of FLT3 by MSI2.","method":"RNA immunoprecipitation (RIP), shRNA knockdown, Western blot, clonogenic assay","journal":"Leukemia research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA binding demonstrated by RIP, functional consequence shown by KD, single lab","pmids":["28107692"],"is_preprint":false},{"year":2017,"finding":"MSI2 maintains quiescence of hair follicle stem cells by directly repressing Hedgehog signaling; Shh is a direct MSI2 target in hair follicle; forced MSI2 expression retards anagen entry and delays hair growth, while Msi2 loss enhances hair regrowth.","method":"Gain- and loss-of-function mouse models, unbiased transcriptome profiling, in vivo hair cycle analysis","journal":"The Journal of investigative dermatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO and OE with transcriptome profiling identifying direct target, single lab","pmids":["28143780"],"is_preprint":false},{"year":2018,"finding":"PAR-CLIP identified MSI2's consensus RNA recognition element as the UUAG motif; MSI2 binds IL6ST (GP130) mRNA and promotes its degradation, thereby controlling IL-6/STAT3 and ERK signaling in leukemia cells.","method":"PAR-CLIP (photoactivatable ribonucleoside cross-linking and immunoprecipitation), MEME motif analysis, MSI2 knockdown, phospho-Western blot","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — PAR-CLIP provides transcriptome-wide direct RNA binding with nucleotide resolution, mechanistic follow-up of IL6ST regulation, single lab but rigorous methodology","pmids":["30126842"],"is_preprint":false},{"year":2019,"finding":"KLF4 directly binds the MSI2 promoter and transcriptionally represses MSI2 expression in pancreatic cancer cells; loss of KLF4 leads to MSI2 overexpression promoting PDAC proliferation, migration and metastasis.","method":"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, gain- and loss-of-function experiments in vitro and in vivo","journal":"Clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding by ChIP and reporter assay, functional rescue, single lab","pmids":["27449499"],"is_preprint":false},{"year":2019,"finding":"ETV4 directly binds the MSI2 promoter and transcriptionally upregulates MSI2 expression in lung adenocarcinoma; ectopic MSI2 expression rescues the inhibitory effects of ETV4 knockdown on LUAD proliferation and invasion.","method":"ChIP, luciferase reporter assay, CCK8/invasion assays, rescue overexpression","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding shown by ChIP and reporter, epistasis rescue, single lab","pmids":["31253395"],"is_preprint":false},{"year":2019,"finding":"MSI2 interacts with Beclin1 protein; MSI2 is transcriptionally activated by HMGA2 binding to the MSI2 promoter (ChIP-seq evidence); MSI2 overexpression reverses autophagy and growth defects caused by HMGA2 knockdown in NF1-MPNST cells.","method":"Co-immunoprecipitation, ChIP-seq, RNA-seq, functional rescue, xenograft","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP for MSI2-Beclin1, ChIP-seq for HMGA2→MSI2, functional epistasis, single lab","pmids":["31053152"],"is_preprint":false},{"year":2020,"finding":"MSI2 protein directly interacts with caveolin-1 (CAV1) in NF1-MPNST cells; MSI2 knockdown induces CAV1 protein expression by inhibiting its ubiquitylation, and CAV1 mediates the suppressive function of MSI2 knockdown on EMT, migration, invasion, and metastasis.","method":"Co-immunoprecipitation, ubiquitylation assay, shRNA knockdown, in vitro/in vivo metastasis assays","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct protein interaction by Co-IP, ubiquitylation mechanism established, functional epistasis in vivo, single lab","pmids":["32606289"],"is_preprint":false},{"year":2020,"finding":"MSI2a isoform (but not MSI2b) promotes TP53INP1 mRNA stability by interacting with the 3'-UTR of TP53INP1 mRNA; MSI2a expression inhibits TNBC cell invasion via TP53INP1-mediated suppression of ERK1/2 activity.","method":"RNA immunoprecipitation (RIP), RNA sequencing, luciferase assay, invasion assays, ERK inhibition","journal":"Journal of experimental & clinical cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA binding by RIP, luciferase 3'UTR reporter, functional rescue, single lab","pmids":["32448269"],"is_preprint":false},{"year":2021,"finding":"MSI2 directly binds EGFR mRNA (demonstrated by RNA immunoprecipitation) and post-transcriptionally controls EGFR protein expression; MSI2 depletion reduces EGFR protein but not mRNA levels, and sensitizes EGFRmut NSCLC cells to EGFR inhibitors.","method":"RNA immunoprecipitation, RT-PCR, Western blot, RPPA, xenograft, cell line panel","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA binding by RIP, protein vs. mRNA comparison, in vivo xenograft, single lab","pmids":["33723247"],"is_preprint":false},{"year":2021,"finding":"Loss of MSI1 and MSI2 together in photoreceptor neurons prevented use of photoreceptor-specific alternative exons in transcripts critical for outer segment morphogenesis, ciliogenesis, and synaptic transmission, causing photoreceptor degeneration; MSI2 alone is robustly expressed in adult retina and required for photoreceptor function.","method":"Conditional double KO mouse (pan-retinal and rod-specific), light response assay, immunohistochemistry, alternative splicing analysis","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — rigorous in vivo conditional KO, multiple phenotypic readouts (electrophysiology, morphology, splicing), mechanistic link to alternative splicing","pmids":["33168629"],"is_preprint":false},{"year":2021,"finding":"MSI2 is required for myofibroblast-derived IL-6 and IL-11 secretion via the ERK1/2 pathway; conditional deletion of Msi2 in myofibroblasts inhibited orthotopic HCC growth and reduced metastasis in mice.","method":"Conditional KO mouse (Col1a1-CreER), orthotopic tumor transplantation, in vitro cytokine measurement, ERK pathway analysis","journal":"Hepatology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — cell-type-specific conditional KO in vivo, defined molecular mechanism (ERK1/2–IL-6/IL-11), single lab","pmids":["33609283"],"is_preprint":false},{"year":2021,"finding":"MSI2 is identified as a critical effector gene downstream of C/EBPα p30 oncogene in CEBPA-mutated AML; p30 drives MSI2 expression through p30-dependent regulatory elements; MSI2 CRISPR knockout caused proliferation arrest, terminal myeloid differentiation, and delayed leukemia in vivo.","method":"ATAC-seq, ChIP-seq, RNA-seq, CRISPR/Cas9 KO, in vivo leukemia model","journal":"Leukemia","confidence":"High","confidence_rationale":"Tier 2 / Strong — multi-omic mapping of regulatory elements, CRISPR KO with in vivo validation, multiple orthogonal methods, single lab","pmids":["33623142"],"is_preprint":false},{"year":2021,"finding":"MSI2 and HuR cooperatively bind pri-MiR7a-1 and repress its processing in an MSI2 dose-dependent manner; this promotes Cry2 translation (a miR-7a-1 target) and facilitates muscle stem cell differentiation and myogenesis.","method":"Immunoprecipitation followed by mass spectrometry, RNA immunoprecipitation, EMSA, luciferase assay, RNAi/overexpression in muscle stem cells, Msi2 KO mice","journal":"Journal of cachexia, sarcopenia and muscle","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — EMSA (direct binding), RIP, luciferase, MS-identified complex, in vivo KO, multiple orthogonal methods in one study","pmids":["34877814"],"is_preprint":false},{"year":2022,"finding":"iCLIP identified MSI2 binds thousands of mRNAs predominantly in 3'UTRs via UAG motifs; functional translational repression is restricted to a small subset bound at higher density with more UAG motifs; EIF3A is identified as an immediate direct translational target of MSI2.","method":"iCLIP (individual nucleotide resolution CLIP), polysome profiling, acute MSI2 depletion, complementary binding/expression analyses","journal":"NAR cancer","confidence":"High","confidence_rationale":"Tier 1 / Moderate — iCLIP with nucleotide resolution, integrated with polysome profiling, acute depletion experiment, rigorous multi-method study in single lab","pmids":["35528200"],"is_preprint":false},{"year":2022,"finding":"LNC942 (LINC00942) prevents MSI2 interaction with SCFβ-TRCP E3 ubiquitin ligase, thereby inhibiting MSI2 ubiquitination and stabilizing MSI2 protein; stabilized MSI2 then promotes c-Myc mRNA stability in an m6A-dependent manner as an m6A reader protein.","method":"Co-immunoprecipitation, ubiquitination assay, RNA immunoprecipitation, RNA pull-down, human proteome array","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP and ubiquitination assay establish mechanism, RIP/pull-down for RNA binding, multiple orthogonal methods, single lab","pmids":["35073459"],"is_preprint":false},{"year":2022,"finding":"LIN28 recruits MSI2 via LIN28 CSD domain interacting with MSI2 RRM domain; the LIN28/MSI2 complex promotes mRNA decay of YAP1 upstream kinases (MST1/2, LATS1/2), leading to YAP1 activation and cancer stem cell properties in TNBC.","method":"Co-immunoprecipitation, domain mapping, RNA immunoprecipitation, transcriptome analysis, in vitro and in vivo functional assays","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain-specific Co-IP establishes interaction, RIP, functional rescue, single lab","pmids":["35102250"],"is_preprint":false},{"year":2023,"finding":"MSI2 binds the IRES of MYC, JUN, and VEGFA mRNAs and HCV IRES to increase their cap-independent (IRES-dependent) translation and promote tumor-initiating stem cell self-renewal; MSI2 also binds a lncRNA that interferes with miRNA processing to upregulate MYC translation.","method":"RIP-seq with anti-MSI2 antibody, IRES-reporter assays, MSI2 overexpression/inhibition, HCV replication assays in humanized mice","journal":"Cell death discovery","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq identifies IRES targets, functional reporter validation, in vivo viral model, single lab","pmids":["37117191"],"is_preprint":false},{"year":2023,"finding":"MSI2 directly binds the 3'UTR of FASN mRNA (shown by RNA immunoprecipitation) and negatively regulates FASN expression, thereby decreasing unsaturated fatty acid content and triglyceride accumulation in bovine mammary epithelial cells.","method":"RNA immunoprecipitation, MSI2 knockdown, fatty acid profiling, Western blot","journal":"Journal of agricultural and food chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct RNA binding to 3'UTR by RIP, functional consequence on lipid metabolism demonstrated, single lab","pmids":["38059915"],"is_preprint":false},{"year":2023,"finding":"MSI2 directly binds to the translation regulatory region of NLK mRNA (positions 79-87 nt) to enhance its transcriptional activity and post-transcriptionally upregulate NLK; MSI2-NLK axis regulates EMT and PI3K-AKT-mTOR pathway to promote pancreatic cancer invasion, migration, and liver metastasis.","method":"Molecular docking, mRNA binding assays, MSI2 knockdown/NLK overexpression epistasis, in vivo liver metastasis model","journal":"Cancer cell international","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined binding site in mRNA, in vivo epistasis rescue, functional pathway analysis, single lab","pmids":["39097735"],"is_preprint":false},{"year":2024,"finding":"MSI2 is a myogenin target gene; Msi2 knockdown in murine myoblasts blocked differentiation and impaired autophagosome formation (reduced LC3) without affecting MyoD or myogenin expression; forced autophagy activation rescued MSI2 loss differentiation defects. Msi2-KO mice had smaller limb muscles and impaired exercise performance.","method":"shRNA knockdown, MSI2 overexpression, autophagy rescue, flow cytometry, in vivo Msi2 KO mouse phenotyping","journal":"Life science alliance","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO in vivo and KD in vitro, autophagy epistasis rescue, multiple phenotypic readouts, single lab","pmids":["38373797"],"is_preprint":false},{"year":2024,"finding":"MSI2 directly binds ATM mRNA and regulates its translation; MSI2 depletion impaired DNA damage response (DDR) signaling (reduced ATM, altered γH2AX and pCHK1 levels) and sensitized NSCLC cells to PARP inhibitors in vitro and in vivo.","method":"RNA immunoprecipitation, KP and KPM2 mouse tumor model comparison, Western blot for DDR markers, PARP inhibitor treatment in vitro and in vivo","journal":"Research square (preprint also published)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct mRNA binding by RIP, in vivo Msi2-KO mouse model, functional pharmacological consequence, single lab","pmids":["37398283","38659828"],"is_preprint":false},{"year":2024,"finding":"MSI2 promotes chemotherapy resistance in T-ALL through posttranscriptional regulation of MYC; MSI2 expression is significantly upregulated in persistent leukemic clones at relapse.","method":"Single-cell RNA + TCR sequencing of diagnosis-relapse pairs, targeted single-cell DNA sequencing, in vitro and in vivo functional studies with MSI2 manipulation","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — single-cell multi-omics, in vitro and in vivo functional studies, post-transcriptional MYC regulation established, single lab","pmids":["37801708"],"is_preprint":false},{"year":2024,"finding":"HuD protein interacts with Msi2 transcript and positively regulates MSI2 expression; MSI2 in turn represses APAF1 transcript translation, protecting N2a neuroblastoma cells from mitochondrial apoptosis; reduced HuD→reduced MSI2→increased APAF1→apoptosis.","method":"RNA immunoprecipitation, siRNA knockdown, Western blot, apoptosis assay in N2a cells","journal":"PloS one","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single RIP assay per interaction, single cell line, single lab","pmids":["39680531"],"is_preprint":false},{"year":2025,"finding":"β-catenin interacts with MSI2 in myeloid cell lines and primary AML samples; MSI2 knockdown reduced Wnt signaling output (TCF/LEF activity) and suppressed LEF-1 expression and nuclear localization; MSI2 binds LEF1 mRNA partly in a β-catenin-dependent fashion, suggesting post-transcriptional control of LEF-1.","method":"Co-immunoprecipitation, RIP-seq, CLIP, MSI2 knockdown, TCF/LEF luciferase reporter, human HSPC expansion assay","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP, RIP and CLIP, reporter assay, primary patient samples, single lab","pmids":["40301545"],"is_preprint":false},{"year":2025,"finding":"PRKCQ-AS1 lncRNA binds MSI2 protein; PRKCQ-AS1 or MSI2 knockdown reduces BMX mRNA stability, ERK phosphorylation, and neuroblastoma cell proliferation; small molecule NSC617570 inhibits PRKCQ-AS1–MSI2 protein interaction and reduces BMX expression and tumor progression in mice.","method":"RNA immunoprecipitation-seq, BMX mRNA stability assay, AlphaScreen compound screening, shRNA knockdown, in vivo mouse tumor model","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq identifies BMX as MSI2-dependent target, small molecule disruption of interaction, in vivo validation, single lab","pmids":["40103284"],"is_preprint":false},{"year":2025,"finding":"MSI2 nuclear localization is mediated by Importin-7 (IPO7) through an MSI2 nuclear localization signal (NLS); IPO7 promotes nuclear translocation of MSI2 and prevents its cytoplasmic ubiquitin-mediated degradation; in the nucleus, IPO7, MSI2, and c-MYC form a ternary complex that enhances c-MYC mRNA stability and MYC-linked glycolytic reprogramming.","method":"Co-immunoprecipitation, nuclear/cytoplasmic fractionation, ubiquitination assay, NLS mutagenesis, mass spectrometry, RNA-seq, Seahorse metabolic analysis, xenograft","journal":"Translational research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP, NLS mutagenesis, fractionation, metabolic readout, in vivo xenograft, multiple methods but single lab","pmids":["42066897"],"is_preprint":false},{"year":2026,"finding":"Alternative splicing generates MSI2 isoforms with distinct subcellular localizations: canonical MSI2-328 localizes to the cytoplasm via a 40-aa region (residues 194–234) and promotes translation; alternatively spliced MSI2-324 localizes predominantly to the nucleus via an 18-aa sequence introduced by an alternative 3' splice acceptor in exon 12, and fails to promote translation. The two isoforms associate with distinct protein networks (translation factors vs. chromatin/pre-mRNA processing factors).","method":"Tethered reporter assay, truncation and point mutagenesis, subcellular fractionation/localization imaging, co-immunoprecipitation/proteomics","journal":"bioRxiv","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — reconstituted reporter with mutagenesis, proteomic interaction networks, multiple orthogonal methods; preprint, not yet peer-reviewed","pmids":["42239307"],"is_preprint":true},{"year":2021,"finding":"MSI2 binds miR-301a-3p and facilitates its mitochondrial distribution in endothelial cells; MSI2 itself localizes to mitochondria of multiple cell types; H2O2 decreases MSI2 in mitochondria and reduces mitochondrial miR-301a-3p; MSI2 overexpression increases and inhibition decreases mitochondrial miR-301a-3p.","method":"RNA pull-down followed by label-free quantitative proteomics, Western blot, immunofluorescence colocalization, MSI2 overexpression/inhibition","journal":"Frontiers in molecular biosciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — RNA pull-down single method for binding, localization by immunofluorescence, single lab, functional relevance of miRNA transport not fully established","pmids":["33553241"],"is_preprint":false},{"year":2015,"finding":"MSI1 directly targets Msi2 mRNA (as well as Erh) in spermatogonia as demonstrated by RNA binding experiments; nuclear import protein IPO5 facilitates nuclear translocation of MSI1, releasing MSI1 RNA-binding targets; this establishes MSI2 mRNA as a direct target of MSI1-mediated translational regulation during spermatogenesis.","method":"Transgenic Msi1 testis-specific overexpression model, RNA binding target identification, co-immunoprecipitation with IPO5","journal":"FASEB journal","confidence":"Low","confidence_rationale":"Tier 3 / Weak — target identification from overexpression model, single binding assay, single lab; MSI2 here is the RNA target (not the acting protein), but mechanistically informs MSI2 regulation","pmids":["25782991"],"is_preprint":false},{"year":2015,"finding":"MSI2 knockout in mice (gene-trap model) causes impaired follicle development: significant decrease in ovarian mass, developmental blocking of antral follicles, pre-antral follicle atresia, reduced MII oocyte yield (60.9% less), and decreased female fertility (33.1% litter size reduction).","method":"Gene-trap KO mouse model, histological follicle staging, hormonal stimulation and oocyte collection, litter size analysis","journal":"Biomolecules","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vivo KO mouse with quantitative ovarian phenotype, multiple reproductive readouts, single lab","pmids":["26131972"],"is_preprint":false},{"year":2023,"finding":"MSI2 directly binds the 3'UTR of c-Myc mRNA to stabilize it, upregulating c-Myc protein and downstream glucose-6-phosphate dehydrogenase (G6PD) transcription, thereby enhancing the pentose phosphate pathway in neuroblastoma cells.","method":"RNA immunoprecipitation, 3'UTR binding assays, G6PD activity measurement, in vitro proliferation/invasion assays","journal":"Medical oncology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single RIP assay for direct binding, mechanistic follow-up limited, single lab","pmids":["37843625"],"is_preprint":false},{"year":2024,"finding":"MSI2 directly binds and stabilizes ENO1 mRNA in acute lymphoblastic leukemia cells; stabilized ENO1 protein then binds and increases stability of RPS3 protein; this circNR3C1/MSI2/ENO1/RPS3 axis promotes ALL cell proliferation and inhibits apoptosis.","method":"Co-immunoprecipitation, RNA immunoprecipitation, RNA pull-down, protein stability analysis, xenograft","journal":"Journal of leukocyte biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — multiple pulldown assays but single lab, circRNA biology context, no mutagenesis validation of binding","pmids":["41069159"],"is_preprint":false},{"year":2024,"finding":"MSI2 directly binds miR-30a-3p via its UAG motif and recruits it to AGO2, facilitating miR-30a-3p loading onto AGO2 to suppress CGRRF1 (a KRAS E3 ubiquitin ligase), thereby stabilizing KRAS and activating the KRAS/ERK pathway to promote chemoresistance.","method":"RNA immunoprecipitation, Co-IP of MSI2-AGO2, mRNA/miRNA binding assays, CGRRF1 ubiquitination assay, pharmacological inhibition","journal":"Neoplasia","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct miRNA binding by RIP, AGO2 Co-IP, ubiquitination assay, mechanistic pathway established, single lab","pmids":["39522321"],"is_preprint":false},{"year":2025,"finding":"FOXF2 transcription factor directly binds the MSI2 promoter (ChIP and luciferase reporter assays) and promotes MSI2 transcription in pancreatic cancer; MSI2 overexpression suppresses NUMB protein translation; FOXF2 knockdown inhibits MSI2 protein translation and enhances NUMB, suppressing PC progression.","method":"Luciferase reporter assay, ChIP, FOXF2/MSI2 knockdown and rescue, xenograft mouse model","journal":"Oncology reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct promoter binding by ChIP + reporter, in vivo xenograft, epistasis, single lab","pmids":["38847273"],"is_preprint":false},{"year":2025,"finding":"A germline non-coding regulatory variant (rs17834140-T) downregulates HSC-selective MSI2 expression and significantly protects against clonal hematopoiesis and myeloid malignancies; stem cell MSI2 levels modify ASXL1-mutant HSC clonal dominance in experimental models, establishing MSI2 as a key post-transcriptional regulator of human HSC fitness.","method":"Population genetic analysis, variant effect modeling, MSI2 CLIP-seq target mapping, ASXL1-mutant HSC clonal competition models","journal":"bioRxiv (preprint)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — human genetic evidence with experimental CLIP-seq target mapping and in vivo HSC clonal competition model, preprint not yet peer-reviewed","pmids":["bio_10.1101_2025.03.24.645017"],"is_preprint":true},{"year":2026,"finding":"MSI2 enhances stability of LINC00667 lncRNA; LINC00667 facilitates IRF6 mRNA degradation via Staufen1-mediated mRNA decay; IRF6 transcriptionally suppresses tight junction proteins ZO-1, occludin, and claudin-5. Thus, MSI2 knockdown reduces LINC00667, allows IRF6 accumulation, and increases blood-tumor barrier permeability.","method":"MSI2 knockdown, lncRNA stability assay, IRF6 ChIP on TJ promoters, Staufen1 knockdown, BTB permeability assay, doxorubicin uptake","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mechanistic pathway dissected through multiple genetic perturbations, ChIP, mRNA decay assay, functional barrier permeability readout, single lab","pmids":["41581866"],"is_preprint":false}],"current_model":"MSI2 is a cytoplasmic (and context-dependently nuclear) RNA-binding protein that recognizes UAG/UUAG motifs in the 3'UTRs and IRES elements of target mRNAs to post-transcriptionally regulate their translation and stability; it maintains hematopoietic and intestinal stem cell self-renewal by repressing differentiation-promoting targets (NUMB, PTEN, LRIG1, etc.), drives cancer stem cell programs by sustaining oncogenic mRNAs (MYC, FLT3, EGFR, TGFβR1/SMAD3, NLK), interacts with partner RBPs (SYNCRIP, LIN28, HuR) in regulatory complexes, is subject to transcriptional regulation by KLF4, ETV4, FOXF2, HMGA2, and C/EBPα p30, and is post-translationally controlled by SCFβ-TRCP-mediated ubiquitination; alternative splicing generates isoforms with distinct subcellular localizations and regulatory outputs, with the cytoplasmic isoform promoting translation and the nuclear isoform associating with chromatin/RNA-processing factors."},"narrative":{"mechanistic_narrative":"MSI2 is an RNA-binding protein bearing two RNA recognition motifs that controls cell fate post-transcriptionally by recognizing UAG/UUAG motifs concentrated in 3'UTRs and IRES elements of target mRNAs [PMID:12649177, PMID:30126842, PMID:35528200]. It maintains stem and progenitor cell self-renewal: depletion impairs hematopoietic stem cell repopulation and drives differentiation, whereas overexpression enhances self-renewal [PMID:20621054], and it sustains both normal and malignant hematopoietic and progenitor populations in MDS, AML, and other tissues [PMID:26898884, PMID:33623142]. Mechanistically MSI2 binds thousands of transcripts but exerts functional translational repression on a high-density subset, with EIF3A as an immediate translational target [PMID:35528200]; it represses tumour-suppressor mRNAs such as Lrig1, Pten, Cdkn1a and NUMB to drive Wnt-independent, PDK-AKT-mTORC1-dependent oncogenic programs [PMID:25774828, PMID:38847273], and post-transcriptionally promotes oncogenic outputs by enhancing translation or stability of FLT3, EGFR, TGFβR1/SMAD3, NLK, and MYC, the latter through IRES-dependent and m6A-dependent mechanisms [PMID:27274057, PMID:28107692, PMID:33723247, PMID:35073459, PMID:37117191, PMID:39097735]. MSI2 operates within RBP networks, interacting with SYNCRIP to maintain HOXA9 translation and leukemia [PMID:28436985], with LIN28 (via a CSD–RRM contact) to degrade Hippo-pathway kinase mRNAs and activate YAP1 [PMID:35102250], and with HuR to control miRNA processing during myogenesis [PMID:34877814]. MSI2 abundance and localization are tightly regulated: it is transcriptionally controlled by KLF4, ETV4, HMGA2, C/EBPα p30, and FOXF2 [PMID:27449499, PMID:31253395, PMID:31053152, PMID:33623142, PMID:38847273], stabilized against SCFβ-TRCP-mediated ubiquitination [PMID:35073459], and partitioned between cytoplasmic translation-promoting and nuclear/chromatin-associated roles by importin-7-dependent nuclear import and alternative splicing of distinct isoforms [PMID:42066897, PMID:42239307]. Beyond cancer, MSI2 supports photoreceptor alternative splicing and survival, muscle stem cell differentiation through autophagy, and ovarian follicle development [PMID:33168629, PMID:38373797, PMID:26131972]. A germline non-coding variant lowering HSC-selective MSI2 expression protects against clonal hematopoiesis and myeloid malignancy, defining MSI2 as a modifier of human HSC fitness [PMID:bio_10.1101_2025.03.24.645017].","teleology":[{"year":2003,"claim":"Establishing that MSI2 is a two-RRM RNA-binding protein and recurrently rearranged in CML progression first linked the gene to both RNA biology and leukemia.","evidence":"Molecular cloning and breakpoint sequencing of a t(7;17) MSI2/HOXA9 fusion in CML","pmids":["12649177"],"confidence":"Medium","gaps":["Did not establish the normal function of MSI2 or its RNA targets","Functional consequence of the fusion protein untested"]},{"year":2010,"claim":"Reciprocal loss- and gain-of-function in vivo answered whether MSI2 has a cell-fate role, defining it as a positive regulator of hematopoietic stem cell self-renewal.","evidence":"In vivo RNAi screen, shRNA/overexpression and competitive repopulation in mouse HSCs","pmids":["20621054"],"confidence":"High","gaps":["Direct mRNA targets in HSCs not mapped","Mechanism of repression not resolved"]},{"year":2015,"claim":"Transcriptome-wide CLIP plus in vivo gain-of-function and pharmacological epistasis showed MSI2 acts as a pleiotropic repressor of tumour suppressors driving oncogenesis through PDK-AKT-mTORC1.","evidence":"Drug-inducible mouse overexpression, PAR-CLIP/CLIP, pharmacological rescue in intestine","pmids":["25774828"],"confidence":"High","gaps":["Whether repression is via decay or translation per target unclear","Wnt-independence mechanism not fully dissected"]},{"year":2016,"claim":"Cell-line and in vivo studies extended MSI2 to solid-tumour metastasis and to maintaining malignant hematopoiesis, showing it translationally supports TGFβ signaling and is required for MDS HSPCs.","evidence":"shRNA/rescue invasion and metastasis assays (NSCLC); conditional KO and inducible OE mouse MDS models","pmids":["27274057","26898884"],"confidence":"High","gaps":["Direct binding sites on TGFβR1/SMAD3 not nucleotide-mapped","MDS-specific target program not defined"]},{"year":2017,"claim":"Proteomic and RIP studies placed MSI2 in cooperative RBP networks and identified direct oncogenic targets, showing MSI2 partners with SYNCRIP to maintain HOXA9 translation and binds FLT3 mRNA, and represses Hedgehog to keep stem cells quiescent.","evidence":"MS interactome, in vivo shRNA screen, RIP, gain/loss-of-function mouse models","pmids":["28436985","28107692","28143780"],"confidence":"High","gaps":["Stoichiometry and architecture of the MSI2-SYNCRIP complex unknown","FLT3 binding shown by RIP without nucleotide-resolution mapping"]},{"year":2018,"claim":"Nucleotide-resolution crosslinking defined the UUAG recognition element and demonstrated MSI2 can drive target mRNA degradation, exemplified by IL6ST control of IL-6/STAT3 signaling.","evidence":"PAR-CLIP with MEME motif analysis, knockdown, phospho-Western in leukemia cells","pmids":["30126842"],"confidence":"High","gaps":["Determinants choosing decay vs translational repression not resolved"]},{"year":2019,"claim":"Promoter-binding studies established that MSI2 expression is set by specific transcription factors and that MSI2 engages autophagy machinery, identifying KLF4 as a repressor, ETV4 and HMGA2 as activators, and Beclin1 as an interactor.","evidence":"ChIP, luciferase reporters, Co-IP, ChIP-seq, functional rescue and xenografts","pmids":["27449499","31253395","31053152"],"confidence":"Medium","gaps":["Direct vs indirect contributions to autophagy unclear","Combinatorial regulation of the MSI2 promoter not integrated"]},{"year":2020,"claim":"Isoform-resolved and protein-interaction work showed MSI2 functions are context- and isoform-dependent, with MSI2a stabilizing TP53INP1 to restrain invasion and MSI2 controlling CAV1 protein stability.","evidence":"RIP, 3'UTR luciferase, isoform-specific assays, Co-IP and ubiquitylation assays","pmids":["32448269","32606289"],"confidence":"Medium","gaps":["Mechanism by which MSI2 controls CAV1 ubiquitylation not defined","Isoform-specific binding determinants not mapped"]},{"year":2021,"claim":"Genetic and multi-omic studies broadened MSI2 into alternative splicing, miRNA processing, and non-hematopoietic stem cell biology, showing roles in photoreceptor exon usage, muscle stem cell differentiation, myofibroblast cytokine secretion, and C/EBPα-p30-driven AML.","evidence":"Conditional double KO retina, MSI2/HuR pri-miRNA processing in muscle stem cells, myofibroblast Col1a1-CreER KO, ATAC/ChIP/RNA-seq with CRISPR KO in AML","pmids":["33168629","34877814","33609283","33623142"],"confidence":"High","gaps":["Whether splicing roles reflect direct nuclear MSI2 activity unclear","Tissue-specific target sets only partly defined"]},{"year":2022,"claim":"Integrated iCLIP/polysome and stability studies refined the model that MSI2 binds broadly but represses a high-density subset, while protein-stability and partner studies showed MSI2 is itself regulated by ubiquitination and recruited by LIN28.","evidence":"iCLIP with polysome profiling and acute depletion; Co-IP/ubiquitination assays; LIN28 CSD–RRM domain mapping and RIP","pmids":["35528200","35073459","35102250"],"confidence":"High","gaps":["Rules determining functional vs non-functional binding incomplete","m6A-reader activity needs independent structural confirmation"]},{"year":2023,"claim":"Target-specific studies expanded MSI2's regulatory repertoire to IRES-dependent translation, lipid metabolism, and NLK-driven invasion, showing it enhances cap-independent translation of MYC/JUN/VEGFA and represses FASN.","evidence":"RIP-seq, IRES reporter assays, fatty acid profiling, defined mRNA binding sites with in vivo metastasis models","pmids":["37117191","38059915","39097735"],"confidence":"Medium","gaps":["IRES targets identified by RIP without structural binding confirmation","Generality of IRES mechanism across targets unclear"]},{"year":2024,"claim":"Functional studies tied MSI2 to therapy resistance and additional biology, showing it controls ATM translation and DDR/PARP-inhibitor sensitivity, drives MYC-dependent chemoresistance in T-ALL, and supports muscle differentiation via autophagy.","evidence":"RIP, KP/KPM2 and Msi2-KO mouse models, single-cell RNA/TCR-seq of relapse pairs, autophagy rescue in myoblasts","pmids":["37398283","38659828","37801708","38373797"],"confidence":"Medium","gaps":["Direct vs indirect link between MSI2 and ATM/autophagy not fully separated","miRNA/AGO2 recruitment role still emerging"]},{"year":2025,"claim":"Localization, interaction, and human genetic studies established how MSI2 is partitioned and how its dose matters, showing IPO7-mediated nuclear import forming an MSI2-MYC complex, β-catenin/LEF1 coupling, and a protective germline variant lowering HSC MSI2.","evidence":"Co-IP, NLS mutagenesis, fractionation, RIP/CLIP, TCF/LEF reporters, population genetics with ASXL1-mutant HSC competition","pmids":["42066897","40301545","bio_10.1101_2025.03.24.645017"],"confidence":"Medium","gaps":["Causal target driving the protective variant's effect not pinned","Nuclear MSI2 functional repertoire incompletely defined"]},{"year":2026,"claim":"Isoform-resolved reconstitution distinguished cytoplasmic translation-promoting from nuclear chromatin-associated MSI2 activities, mapping localization signals and distinct interactomes.","evidence":"Tethered reporter assay, truncation/point mutagenesis, fractionation imaging, Co-IP/proteomics (preprint)","pmids":["42239307"],"confidence":"Medium","gaps":["Preprint, not yet peer-reviewed","Physiological balance of isoforms across tissues unknown"]},{"year":null,"claim":"It remains unresolved what structural and sequence features partition MSI2 binding into productive translational repression, activation, mRNA decay, m6A reading, and miRNA-processing outcomes across tissues.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unifying rule linking binding density/site to regulatory outcome","No high-resolution structure of MSI2 in functional complexes (SYNCRIP, LIN28, IPO7-MYC)","Isoform abundance and switching in vivo not quantified"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,2,8,19,22]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[3,19,22,39]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[8,20,21]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,18,21,38]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[31,32]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[31,32]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[8,19,22]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[3,19,39]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,7,8,29]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,4,17,27]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,15,25,35]}],"complexes":[],"partners":["SYNCRIP","LIN28","HUR","BECLIN1","CAV1","IPO7","AGO2","CTNNB1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q96DH6","full_name":"RNA-binding protein Musashi homolog 2","aliases":[],"length_aa":328,"mass_kda":35.2,"function":"RNA binding protein that regulates the expression of target mRNAs at the translation level. May play a role in the proliferation and maintenance of stem cells in the central nervous system (By similarity)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q96DH6/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MSI2","classification":"Not Classified","n_dependent_lines":73,"n_total_lines":1208,"dependency_fraction":0.060430463576158944},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"HNRNPH1","stoichiometry":0.2},{"gene":"IGF2BP1","stoichiometry":0.2},{"gene":"UPF1","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/MSI2","total_profiled":1310},"omim":[{"mim_id":"608232","title":"LEUKEMIA, CHRONIC MYELOID; CML","url":"https://www.omim.org/entry/608232"},{"mim_id":"607897","title":"MUSASHI RNA BINDING PROTEIN 2; MSI2","url":"https://www.omim.org/entry/607897"},{"mim_id":"603728","title":"NUMB ENDOCYTIC ADAPTOR PROTEIN; NUMB","url":"https://www.omim.org/entry/603728"},{"mim_id":"603328","title":"MUSASHI RNA BINDING PROTEIN 1; MSI1","url":"https://www.omim.org/entry/603328"},{"mim_id":"601771","title":"CYTOCHROME P450, SUBFAMILY I, POLYPEPTIDE 1; CYP1B1","url":"https://www.omim.org/entry/601771"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"retina","ntpm":116.8}],"url":"https://www.proteinatlas.org/search/MSI2"},"hgnc":{"alias_symbol":[],"prev_symbol":[]},"alphafold":{"accession":"Q96DH6","domains":[{"cath_id":"3.30.70.330","chopping":"21-94","consensus_level":"high","plddt":88.5199,"start":21,"end":94},{"cath_id":"3.30.70.330","chopping":"110-187","consensus_level":"high","plddt":87.6224,"start":110,"end":187}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96DH6","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q96DH6-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q96DH6-F1-predicted_aligned_error_v6.png","plddt_mean":66.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MSI2","jax_strain_url":"https://www.jax.org/strain/search?query=MSI2"},"sequence":{"accession":"Q96DH6","fasta_url":"https://rest.uniprot.org/uniprotkb/Q96DH6.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q96DH6/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q96DH6"}},"corpus_meta":[{"pmid":"20621054","id":"PMC_20621054","title":"An 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cloning, RT-PCR, sequence analysis of translocation breakpoints\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct molecular characterization of fusion transcript by multiple methods, single lab\",\n      \"pmids\": [\"12649177\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Msi2 shRNA-mediated depletion in mouse HSCs significantly impaired hematopoietic stem cell repopulation in vivo and promoted differentiation in vitro; conversely, Msi2 overexpression enhanced HSC self-renewal, establishing MSI2 as a positive regulator of HSC self-renewal.\",\n      \"method\": \"In vivo RNAi screen, shRNA knockdown, retroviral overexpression, competitive repopulation assays, gene expression profiling\",\n      \"journal\": \"Cell stem cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal loss- and gain-of-function approaches in vivo and in vitro, replicated across conditions\",\n      \"pmids\": [\"20621054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MSI2 acts as a pleiotropic post-transcriptional repressor of intestinal tumour suppressors including Lrig1, Bmpr1a, Cdkn1a, and Pten; MSI2 gain-of-function in intestinal epithelium phenocopied APC loss in a Wnt-independent manner, and PDK-AKT-mTORC1 inhibition rescued its oncogenic effects.\",\n      \"method\": \"Drug-inducible mouse overexpression model, transcriptome-wide RNA-binding analysis (PAR-CLIP/CLIP), loss-of-function experiments, pharmacological rescue\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — transcriptome-wide RNA binding mapped, in vivo gain-of-function, pharmacological epistasis, multiple orthogonal methods\",\n      \"pmids\": [\"25774828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MSI2 directly regulates translation of TGFβR1 and SMAD3 mRNAs to support TGF-β signaling and promote NSCLC metastasis; MSI2 depletion induced claudin tight-junction proteins (CLDN3, CLDN5, CLDN7) and overexpression of TGFβRI rescued the invasion deficit caused by MSI2 loss.\",\n      \"method\": \"shRNA depletion in multiple cell lines, rescue overexpression, invasion/metastasis assays in vitro and in vivo, Western blot, gene expression analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — epistasis rescue experiment, multiple cell lines, in vivo metastasis, multiple orthogonal methods\",\n      \"pmids\": [\"27274057\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"MSI2 expression is required for maintaining activated MDS hematopoietic stem and progenitor cells; conditional Msi2 deletion in a mouse MDS model caused rapid loss of MDS HSPCs and reversed clinical MDS features, while inducible MSI2 overexpression drove myeloid disease progression.\",\n      \"method\": \"Conditional knockout mouse, inducible overexpression mouse, flow cytometry, gene expression profiling\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal conditional KO and inducible OE in vivo mouse models, disease phenotype reversal, multiple orthogonal readouts\",\n      \"pmids\": [\"26898884\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MSI2 physically interacts with SYNCRIP (and other RBPs) through shared mRNA targets; proteomic analysis of the MSI2-interacting RBP network identified SYNCRIP as required for in vivo leukemia; SYNCRIP maintains HOXA9 translation and MSI2 or HOXA9 overexpression rescued SYNCRIP depletion effects.\",\n      \"method\": \"Proteomic interactome analysis (mass spectrometry), shRNA functional screen, gene expression profiling, rescue overexpression, in vivo leukemia assays\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proteomic interactome mapping, in vivo functional screen, epistasis rescue, multiple orthogonal methods\",\n      \"pmids\": [\"28436985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MSI2 protein directly binds FLT3 mRNA transcripts as shown by RNA immunoprecipitation; MSI2 loss leads to downregulation of FLT3 receptor expression in AML and CML blast crisis cells and impairs clonogenic growth, establishing post-transcriptional regulation of FLT3 by MSI2.\",\n      \"method\": \"RNA immunoprecipitation (RIP), shRNA knockdown, Western blot, clonogenic assay\",\n      \"journal\": \"Leukemia research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA binding demonstrated by RIP, functional consequence shown by KD, single lab\",\n      \"pmids\": [\"28107692\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MSI2 maintains quiescence of hair follicle stem cells by directly repressing Hedgehog signaling; Shh is a direct MSI2 target in hair follicle; forced MSI2 expression retards anagen entry and delays hair growth, while Msi2 loss enhances hair regrowth.\",\n      \"method\": \"Gain- and loss-of-function mouse models, unbiased transcriptome profiling, in vivo hair cycle analysis\",\n      \"journal\": \"The Journal of investigative dermatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO and OE with transcriptome profiling identifying direct target, single lab\",\n      \"pmids\": [\"28143780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PAR-CLIP identified MSI2's consensus RNA recognition element as the UUAG motif; MSI2 binds IL6ST (GP130) mRNA and promotes its degradation, thereby controlling IL-6/STAT3 and ERK signaling in leukemia cells.\",\n      \"method\": \"PAR-CLIP (photoactivatable ribonucleoside cross-linking and immunoprecipitation), MEME motif analysis, MSI2 knockdown, phospho-Western blot\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — PAR-CLIP provides transcriptome-wide direct RNA binding with nucleotide resolution, mechanistic follow-up of IL6ST regulation, single lab but rigorous methodology\",\n      \"pmids\": [\"30126842\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"KLF4 directly binds the MSI2 promoter and transcriptionally represses MSI2 expression in pancreatic cancer cells; loss of KLF4 leads to MSI2 overexpression promoting PDAC proliferation, migration and metastasis.\",\n      \"method\": \"Chromatin immunoprecipitation (ChIP), luciferase reporter assay, gain- and loss-of-function experiments in vitro and in vivo\",\n      \"journal\": \"Clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding by ChIP and reporter assay, functional rescue, single lab\",\n      \"pmids\": [\"27449499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ETV4 directly binds the MSI2 promoter and transcriptionally upregulates MSI2 expression in lung adenocarcinoma; ectopic MSI2 expression rescues the inhibitory effects of ETV4 knockdown on LUAD proliferation and invasion.\",\n      \"method\": \"ChIP, luciferase reporter assay, CCK8/invasion assays, rescue overexpression\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding shown by ChIP and reporter, epistasis rescue, single lab\",\n      \"pmids\": [\"31253395\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MSI2 interacts with Beclin1 protein; MSI2 is transcriptionally activated by HMGA2 binding to the MSI2 promoter (ChIP-seq evidence); MSI2 overexpression reverses autophagy and growth defects caused by HMGA2 knockdown in NF1-MPNST cells.\",\n      \"method\": \"Co-immunoprecipitation, ChIP-seq, RNA-seq, functional rescue, xenograft\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP for MSI2-Beclin1, ChIP-seq for HMGA2→MSI2, functional epistasis, single lab\",\n      \"pmids\": [\"31053152\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MSI2 protein directly interacts with caveolin-1 (CAV1) in NF1-MPNST cells; MSI2 knockdown induces CAV1 protein expression by inhibiting its ubiquitylation, and CAV1 mediates the suppressive function of MSI2 knockdown on EMT, migration, invasion, and metastasis.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitylation assay, shRNA knockdown, in vitro/in vivo metastasis assays\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct protein interaction by Co-IP, ubiquitylation mechanism established, functional epistasis in vivo, single lab\",\n      \"pmids\": [\"32606289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MSI2a isoform (but not MSI2b) promotes TP53INP1 mRNA stability by interacting with the 3'-UTR of TP53INP1 mRNA; MSI2a expression inhibits TNBC cell invasion via TP53INP1-mediated suppression of ERK1/2 activity.\",\n      \"method\": \"RNA immunoprecipitation (RIP), RNA sequencing, luciferase assay, invasion assays, ERK inhibition\",\n      \"journal\": \"Journal of experimental & clinical cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA binding by RIP, luciferase 3'UTR reporter, functional rescue, single lab\",\n      \"pmids\": [\"32448269\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MSI2 directly binds EGFR mRNA (demonstrated by RNA immunoprecipitation) and post-transcriptionally controls EGFR protein expression; MSI2 depletion reduces EGFR protein but not mRNA levels, and sensitizes EGFRmut NSCLC cells to EGFR inhibitors.\",\n      \"method\": \"RNA immunoprecipitation, RT-PCR, Western blot, RPPA, xenograft, cell line panel\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA binding by RIP, protein vs. mRNA comparison, in vivo xenograft, single lab\",\n      \"pmids\": [\"33723247\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Loss of MSI1 and MSI2 together in photoreceptor neurons prevented use of photoreceptor-specific alternative exons in transcripts critical for outer segment morphogenesis, ciliogenesis, and synaptic transmission, causing photoreceptor degeneration; MSI2 alone is robustly expressed in adult retina and required for photoreceptor function.\",\n      \"method\": \"Conditional double KO mouse (pan-retinal and rod-specific), light response assay, immunohistochemistry, alternative splicing analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — rigorous in vivo conditional KO, multiple phenotypic readouts (electrophysiology, morphology, splicing), mechanistic link to alternative splicing\",\n      \"pmids\": [\"33168629\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MSI2 is required for myofibroblast-derived IL-6 and IL-11 secretion via the ERK1/2 pathway; conditional deletion of Msi2 in myofibroblasts inhibited orthotopic HCC growth and reduced metastasis in mice.\",\n      \"method\": \"Conditional KO mouse (Col1a1-CreER), orthotopic tumor transplantation, in vitro cytokine measurement, ERK pathway analysis\",\n      \"journal\": \"Hepatology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — cell-type-specific conditional KO in vivo, defined molecular mechanism (ERK1/2–IL-6/IL-11), single lab\",\n      \"pmids\": [\"33609283\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MSI2 is identified as a critical effector gene downstream of C/EBPα p30 oncogene in CEBPA-mutated AML; p30 drives MSI2 expression through p30-dependent regulatory elements; MSI2 CRISPR knockout caused proliferation arrest, terminal myeloid differentiation, and delayed leukemia in vivo.\",\n      \"method\": \"ATAC-seq, ChIP-seq, RNA-seq, CRISPR/Cas9 KO, in vivo leukemia model\",\n      \"journal\": \"Leukemia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multi-omic mapping of regulatory elements, CRISPR KO with in vivo validation, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"33623142\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MSI2 and HuR cooperatively bind pri-MiR7a-1 and repress its processing in an MSI2 dose-dependent manner; this promotes Cry2 translation (a miR-7a-1 target) and facilitates muscle stem cell differentiation and myogenesis.\",\n      \"method\": \"Immunoprecipitation followed by mass spectrometry, RNA immunoprecipitation, EMSA, luciferase assay, RNAi/overexpression in muscle stem cells, Msi2 KO mice\",\n      \"journal\": \"Journal of cachexia, sarcopenia and muscle\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — EMSA (direct binding), RIP, luciferase, MS-identified complex, in vivo KO, multiple orthogonal methods in one study\",\n      \"pmids\": [\"34877814\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"iCLIP identified MSI2 binds thousands of mRNAs predominantly in 3'UTRs via UAG motifs; functional translational repression is restricted to a small subset bound at higher density with more UAG motifs; EIF3A is identified as an immediate direct translational target of MSI2.\",\n      \"method\": \"iCLIP (individual nucleotide resolution CLIP), polysome profiling, acute MSI2 depletion, complementary binding/expression analyses\",\n      \"journal\": \"NAR cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — iCLIP with nucleotide resolution, integrated with polysome profiling, acute depletion experiment, rigorous multi-method study in single lab\",\n      \"pmids\": [\"35528200\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LNC942 (LINC00942) prevents MSI2 interaction with SCFβ-TRCP E3 ubiquitin ligase, thereby inhibiting MSI2 ubiquitination and stabilizing MSI2 protein; stabilized MSI2 then promotes c-Myc mRNA stability in an m6A-dependent manner as an m6A reader protein.\",\n      \"method\": \"Co-immunoprecipitation, ubiquitination assay, RNA immunoprecipitation, RNA pull-down, human proteome array\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP and ubiquitination assay establish mechanism, RIP/pull-down for RNA binding, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"35073459\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"LIN28 recruits MSI2 via LIN28 CSD domain interacting with MSI2 RRM domain; the LIN28/MSI2 complex promotes mRNA decay of YAP1 upstream kinases (MST1/2, LATS1/2), leading to YAP1 activation and cancer stem cell properties in TNBC.\",\n      \"method\": \"Co-immunoprecipitation, domain mapping, RNA immunoprecipitation, transcriptome analysis, in vitro and in vivo functional assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain-specific Co-IP establishes interaction, RIP, functional rescue, single lab\",\n      \"pmids\": [\"35102250\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MSI2 binds the IRES of MYC, JUN, and VEGFA mRNAs and HCV IRES to increase their cap-independent (IRES-dependent) translation and promote tumor-initiating stem cell self-renewal; MSI2 also binds a lncRNA that interferes with miRNA processing to upregulate MYC translation.\",\n      \"method\": \"RIP-seq with anti-MSI2 antibody, IRES-reporter assays, MSI2 overexpression/inhibition, HCV replication assays in humanized mice\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq identifies IRES targets, functional reporter validation, in vivo viral model, single lab\",\n      \"pmids\": [\"37117191\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MSI2 directly binds the 3'UTR of FASN mRNA (shown by RNA immunoprecipitation) and negatively regulates FASN expression, thereby decreasing unsaturated fatty acid content and triglyceride accumulation in bovine mammary epithelial cells.\",\n      \"method\": \"RNA immunoprecipitation, MSI2 knockdown, fatty acid profiling, Western blot\",\n      \"journal\": \"Journal of agricultural and food chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA binding to 3'UTR by RIP, functional consequence on lipid metabolism demonstrated, single lab\",\n      \"pmids\": [\"38059915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MSI2 directly binds to the translation regulatory region of NLK mRNA (positions 79-87 nt) to enhance its transcriptional activity and post-transcriptionally upregulate NLK; MSI2-NLK axis regulates EMT and PI3K-AKT-mTOR pathway to promote pancreatic cancer invasion, migration, and liver metastasis.\",\n      \"method\": \"Molecular docking, mRNA binding assays, MSI2 knockdown/NLK overexpression epistasis, in vivo liver metastasis model\",\n      \"journal\": \"Cancer cell international\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined binding site in mRNA, in vivo epistasis rescue, functional pathway analysis, single lab\",\n      \"pmids\": [\"39097735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MSI2 is a myogenin target gene; Msi2 knockdown in murine myoblasts blocked differentiation and impaired autophagosome formation (reduced LC3) without affecting MyoD or myogenin expression; forced autophagy activation rescued MSI2 loss differentiation defects. Msi2-KO mice had smaller limb muscles and impaired exercise performance.\",\n      \"method\": \"shRNA knockdown, MSI2 overexpression, autophagy rescue, flow cytometry, in vivo Msi2 KO mouse phenotyping\",\n      \"journal\": \"Life science alliance\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO in vivo and KD in vitro, autophagy epistasis rescue, multiple phenotypic readouts, single lab\",\n      \"pmids\": [\"38373797\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MSI2 directly binds ATM mRNA and regulates its translation; MSI2 depletion impaired DNA damage response (DDR) signaling (reduced ATM, altered γH2AX and pCHK1 levels) and sensitized NSCLC cells to PARP inhibitors in vitro and in vivo.\",\n      \"method\": \"RNA immunoprecipitation, KP and KPM2 mouse tumor model comparison, Western blot for DDR markers, PARP inhibitor treatment in vitro and in vivo\",\n      \"journal\": \"Research square (preprint also published)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct mRNA binding by RIP, in vivo Msi2-KO mouse model, functional pharmacological consequence, single lab\",\n      \"pmids\": [\"37398283\", \"38659828\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MSI2 promotes chemotherapy resistance in T-ALL through posttranscriptional regulation of MYC; MSI2 expression is significantly upregulated in persistent leukemic clones at relapse.\",\n      \"method\": \"Single-cell RNA + TCR sequencing of diagnosis-relapse pairs, targeted single-cell DNA sequencing, in vitro and in vivo functional studies with MSI2 manipulation\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single-cell multi-omics, in vitro and in vivo functional studies, post-transcriptional MYC regulation established, single lab\",\n      \"pmids\": [\"37801708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"HuD protein interacts with Msi2 transcript and positively regulates MSI2 expression; MSI2 in turn represses APAF1 transcript translation, protecting N2a neuroblastoma cells from mitochondrial apoptosis; reduced HuD→reduced MSI2→increased APAF1→apoptosis.\",\n      \"method\": \"RNA immunoprecipitation, siRNA knockdown, Western blot, apoptosis assay in N2a cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single RIP assay per interaction, single cell line, single lab\",\n      \"pmids\": [\"39680531\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"β-catenin interacts with MSI2 in myeloid cell lines and primary AML samples; MSI2 knockdown reduced Wnt signaling output (TCF/LEF activity) and suppressed LEF-1 expression and nuclear localization; MSI2 binds LEF1 mRNA partly in a β-catenin-dependent fashion, suggesting post-transcriptional control of LEF-1.\",\n      \"method\": \"Co-immunoprecipitation, RIP-seq, CLIP, MSI2 knockdown, TCF/LEF luciferase reporter, human HSPC expansion assay\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP, RIP and CLIP, reporter assay, primary patient samples, single lab\",\n      \"pmids\": [\"40301545\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PRKCQ-AS1 lncRNA binds MSI2 protein; PRKCQ-AS1 or MSI2 knockdown reduces BMX mRNA stability, ERK phosphorylation, and neuroblastoma cell proliferation; small molecule NSC617570 inhibits PRKCQ-AS1–MSI2 protein interaction and reduces BMX expression and tumor progression in mice.\",\n      \"method\": \"RNA immunoprecipitation-seq, BMX mRNA stability assay, AlphaScreen compound screening, shRNA knockdown, in vivo mouse tumor model\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq identifies BMX as MSI2-dependent target, small molecule disruption of interaction, in vivo validation, single lab\",\n      \"pmids\": [\"40103284\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"MSI2 nuclear localization is mediated by Importin-7 (IPO7) through an MSI2 nuclear localization signal (NLS); IPO7 promotes nuclear translocation of MSI2 and prevents its cytoplasmic ubiquitin-mediated degradation; in the nucleus, IPO7, MSI2, and c-MYC form a ternary complex that enhances c-MYC mRNA stability and MYC-linked glycolytic reprogramming.\",\n      \"method\": \"Co-immunoprecipitation, nuclear/cytoplasmic fractionation, ubiquitination assay, NLS mutagenesis, mass spectrometry, RNA-seq, Seahorse metabolic analysis, xenograft\",\n      \"journal\": \"Translational research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP, NLS mutagenesis, fractionation, metabolic readout, in vivo xenograft, multiple methods but single lab\",\n      \"pmids\": [\"42066897\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Alternative splicing generates MSI2 isoforms with distinct subcellular localizations: canonical MSI2-328 localizes to the cytoplasm via a 40-aa region (residues 194–234) and promotes translation; alternatively spliced MSI2-324 localizes predominantly to the nucleus via an 18-aa sequence introduced by an alternative 3' splice acceptor in exon 12, and fails to promote translation. The two isoforms associate with distinct protein networks (translation factors vs. chromatin/pre-mRNA processing factors).\",\n      \"method\": \"Tethered reporter assay, truncation and point mutagenesis, subcellular fractionation/localization imaging, co-immunoprecipitation/proteomics\",\n      \"journal\": \"bioRxiv\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — reconstituted reporter with mutagenesis, proteomic interaction networks, multiple orthogonal methods; preprint, not yet peer-reviewed\",\n      \"pmids\": [\"42239307\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"MSI2 binds miR-301a-3p and facilitates its mitochondrial distribution in endothelial cells; MSI2 itself localizes to mitochondria of multiple cell types; H2O2 decreases MSI2 in mitochondria and reduces mitochondrial miR-301a-3p; MSI2 overexpression increases and inhibition decreases mitochondrial miR-301a-3p.\",\n      \"method\": \"RNA pull-down followed by label-free quantitative proteomics, Western blot, immunofluorescence colocalization, MSI2 overexpression/inhibition\",\n      \"journal\": \"Frontiers in molecular biosciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — RNA pull-down single method for binding, localization by immunofluorescence, single lab, functional relevance of miRNA transport not fully established\",\n      \"pmids\": [\"33553241\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MSI1 directly targets Msi2 mRNA (as well as Erh) in spermatogonia as demonstrated by RNA binding experiments; nuclear import protein IPO5 facilitates nuclear translocation of MSI1, releasing MSI1 RNA-binding targets; this establishes MSI2 mRNA as a direct target of MSI1-mediated translational regulation during spermatogenesis.\",\n      \"method\": \"Transgenic Msi1 testis-specific overexpression model, RNA binding target identification, co-immunoprecipitation with IPO5\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — target identification from overexpression model, single binding assay, single lab; MSI2 here is the RNA target (not the acting protein), but mechanistically informs MSI2 regulation\",\n      \"pmids\": [\"25782991\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"MSI2 knockout in mice (gene-trap model) causes impaired follicle development: significant decrease in ovarian mass, developmental blocking of antral follicles, pre-antral follicle atresia, reduced MII oocyte yield (60.9% less), and decreased female fertility (33.1% litter size reduction).\",\n      \"method\": \"Gene-trap KO mouse model, histological follicle staging, hormonal stimulation and oocyte collection, litter size analysis\",\n      \"journal\": \"Biomolecules\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vivo KO mouse with quantitative ovarian phenotype, multiple reproductive readouts, single lab\",\n      \"pmids\": [\"26131972\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MSI2 directly binds the 3'UTR of c-Myc mRNA to stabilize it, upregulating c-Myc protein and downstream glucose-6-phosphate dehydrogenase (G6PD) transcription, thereby enhancing the pentose phosphate pathway in neuroblastoma cells.\",\n      \"method\": \"RNA immunoprecipitation, 3'UTR binding assays, G6PD activity measurement, in vitro proliferation/invasion assays\",\n      \"journal\": \"Medical oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single RIP assay for direct binding, mechanistic follow-up limited, single lab\",\n      \"pmids\": [\"37843625\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MSI2 directly binds and stabilizes ENO1 mRNA in acute lymphoblastic leukemia cells; stabilized ENO1 protein then binds and increases stability of RPS3 protein; this circNR3C1/MSI2/ENO1/RPS3 axis promotes ALL cell proliferation and inhibits apoptosis.\",\n      \"method\": \"Co-immunoprecipitation, RNA immunoprecipitation, RNA pull-down, protein stability analysis, xenograft\",\n      \"journal\": \"Journal of leukocyte biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — multiple pulldown assays but single lab, circRNA biology context, no mutagenesis validation of binding\",\n      \"pmids\": [\"41069159\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"MSI2 directly binds miR-30a-3p via its UAG motif and recruits it to AGO2, facilitating miR-30a-3p loading onto AGO2 to suppress CGRRF1 (a KRAS E3 ubiquitin ligase), thereby stabilizing KRAS and activating the KRAS/ERK pathway to promote chemoresistance.\",\n      \"method\": \"RNA immunoprecipitation, Co-IP of MSI2-AGO2, mRNA/miRNA binding assays, CGRRF1 ubiquitination assay, pharmacological inhibition\",\n      \"journal\": \"Neoplasia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct miRNA binding by RIP, AGO2 Co-IP, ubiquitination assay, mechanistic pathway established, single lab\",\n      \"pmids\": [\"39522321\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"FOXF2 transcription factor directly binds the MSI2 promoter (ChIP and luciferase reporter assays) and promotes MSI2 transcription in pancreatic cancer; MSI2 overexpression suppresses NUMB protein translation; FOXF2 knockdown inhibits MSI2 protein translation and enhances NUMB, suppressing PC progression.\",\n      \"method\": \"Luciferase reporter assay, ChIP, FOXF2/MSI2 knockdown and rescue, xenograft mouse model\",\n      \"journal\": \"Oncology reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct promoter binding by ChIP + reporter, in vivo xenograft, epistasis, single lab\",\n      \"pmids\": [\"38847273\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A germline non-coding regulatory variant (rs17834140-T) downregulates HSC-selective MSI2 expression and significantly protects against clonal hematopoiesis and myeloid malignancies; stem cell MSI2 levels modify ASXL1-mutant HSC clonal dominance in experimental models, establishing MSI2 as a key post-transcriptional regulator of human HSC fitness.\",\n      \"method\": \"Population genetic analysis, variant effect modeling, MSI2 CLIP-seq target mapping, ASXL1-mutant HSC clonal competition models\",\n      \"journal\": \"bioRxiv (preprint)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — human genetic evidence with experimental CLIP-seq target mapping and in vivo HSC clonal competition model, preprint not yet peer-reviewed\",\n      \"pmids\": [\"bio_10.1101_2025.03.24.645017\"],\n      \"is_preprint\": true\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"MSI2 enhances stability of LINC00667 lncRNA; LINC00667 facilitates IRF6 mRNA degradation via Staufen1-mediated mRNA decay; IRF6 transcriptionally suppresses tight junction proteins ZO-1, occludin, and claudin-5. Thus, MSI2 knockdown reduces LINC00667, allows IRF6 accumulation, and increases blood-tumor barrier permeability.\",\n      \"method\": \"MSI2 knockdown, lncRNA stability assay, IRF6 ChIP on TJ promoters, Staufen1 knockdown, BTB permeability assay, doxorubicin uptake\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mechanistic pathway dissected through multiple genetic perturbations, ChIP, mRNA decay assay, functional barrier permeability readout, single lab\",\n      \"pmids\": [\"41581866\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MSI2 is a cytoplasmic (and context-dependently nuclear) RNA-binding protein that recognizes UAG/UUAG motifs in the 3'UTRs and IRES elements of target mRNAs to post-transcriptionally regulate their translation and stability; it maintains hematopoietic and intestinal stem cell self-renewal by repressing differentiation-promoting targets (NUMB, PTEN, LRIG1, etc.), drives cancer stem cell programs by sustaining oncogenic mRNAs (MYC, FLT3, EGFR, TGFβR1/SMAD3, NLK), interacts with partner RBPs (SYNCRIP, LIN28, HuR) in regulatory complexes, is subject to transcriptional regulation by KLF4, ETV4, FOXF2, HMGA2, and C/EBPα p30, and is post-translationally controlled by SCFβ-TRCP-mediated ubiquitination; alternative splicing generates isoforms with distinct subcellular localizations and regulatory outputs, with the cytoplasmic isoform promoting translation and the nuclear isoform associating with chromatin/RNA-processing factors.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MSI2 is an RNA-binding protein bearing two RNA recognition motifs that controls cell fate post-transcriptionally by recognizing UAG/UUAG motifs concentrated in 3'UTRs and IRES elements of target mRNAs [#0, #8, #19]. It maintains stem and progenitor cell self-renewal: depletion impairs hematopoietic stem cell repopulation and drives differentiation, whereas overexpression enhances self-renewal [#1], and it sustains both normal and malignant hematopoietic and progenitor populations in MDS, AML, and other tissues [#4, #17]. Mechanistically MSI2 binds thousands of transcripts but exerts functional translational repression on a high-density subset, with EIF3A as an immediate translational target [#19]; it represses tumour-suppressor mRNAs such as Lrig1, Pten, Cdkn1a and NUMB to drive Wnt-independent, PDK-AKT-mTORC1-dependent oncogenic programs [#2, #39], and post-transcriptionally promotes oncogenic outputs by enhancing translation or stability of FLT3, EGFR, TGFβR1/SMAD3, NLK, and MYC, the latter through IRES-dependent and m6A-dependent mechanisms [#3, #6, #14, #20, #22, #24]. MSI2 operates within RBP networks, interacting with SYNCRIP to maintain HOXA9 translation and leukemia [#5], with LIN28 (via a CSD–RRM contact) to degrade Hippo-pathway kinase mRNAs and activate YAP1 [#21], and with HuR to control miRNA processing during myogenesis [#18]. MSI2 abundance and localization are tightly regulated: it is transcriptionally controlled by KLF4, ETV4, HMGA2, C/EBPα p30, and FOXF2 [#9, #10, #11, #17, #39], stabilized against SCFβ-TRCP-mediated ubiquitination [#20], and partitioned between cytoplasmic translation-promoting and nuclear/chromatin-associated roles by importin-7-dependent nuclear import and alternative splicing of distinct isoforms [#31, #32]. Beyond cancer, MSI2 supports photoreceptor alternative splicing and survival, muscle stem cell differentiation through autophagy, and ovarian follicle development [#15, #25, #35]. A germline non-coding variant lowering HSC-selective MSI2 expression protects against clonal hematopoiesis and myeloid malignancy, defining MSI2 as a modifier of human HSC fitness [#40].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing that MSI2 is a two-RRM RNA-binding protein and recurrently rearranged in CML progression first linked the gene to both RNA biology and leukemia.\",\n      \"evidence\": \"Molecular cloning and breakpoint sequencing of a t(7;17) MSI2/HOXA9 fusion in CML\",\n      \"pmids\": [\"12649177\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Did not establish the normal function of MSI2 or its RNA targets\", \"Functional consequence of the fusion protein untested\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Reciprocal loss- and gain-of-function in vivo answered whether MSI2 has a cell-fate role, defining it as a positive regulator of hematopoietic stem cell self-renewal.\",\n      \"evidence\": \"In vivo RNAi screen, shRNA/overexpression and competitive repopulation in mouse HSCs\",\n      \"pmids\": [\"20621054\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mRNA targets in HSCs not mapped\", \"Mechanism of repression not resolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Transcriptome-wide CLIP plus in vivo gain-of-function and pharmacological epistasis showed MSI2 acts as a pleiotropic repressor of tumour suppressors driving oncogenesis through PDK-AKT-mTORC1.\",\n      \"evidence\": \"Drug-inducible mouse overexpression, PAR-CLIP/CLIP, pharmacological rescue in intestine\",\n      \"pmids\": [\"25774828\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether repression is via decay or translation per target unclear\", \"Wnt-independence mechanism not fully dissected\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Cell-line and in vivo studies extended MSI2 to solid-tumour metastasis and to maintaining malignant hematopoiesis, showing it translationally supports TGFβ signaling and is required for MDS HSPCs.\",\n      \"evidence\": \"shRNA/rescue invasion and metastasis assays (NSCLC); conditional KO and inducible OE mouse MDS models\",\n      \"pmids\": [\"27274057\", \"26898884\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct binding sites on TGFβR1/SMAD3 not nucleotide-mapped\", \"MDS-specific target program not defined\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Proteomic and RIP studies placed MSI2 in cooperative RBP networks and identified direct oncogenic targets, showing MSI2 partners with SYNCRIP to maintain HOXA9 translation and binds FLT3 mRNA, and represses Hedgehog to keep stem cells quiescent.\",\n      \"evidence\": \"MS interactome, in vivo shRNA screen, RIP, gain/loss-of-function mouse models\",\n      \"pmids\": [\"28436985\", \"28107692\", \"28143780\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry and architecture of the MSI2-SYNCRIP complex unknown\", \"FLT3 binding shown by RIP without nucleotide-resolution mapping\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Nucleotide-resolution crosslinking defined the UUAG recognition element and demonstrated MSI2 can drive target mRNA degradation, exemplified by IL6ST control of IL-6/STAT3 signaling.\",\n      \"evidence\": \"PAR-CLIP with MEME motif analysis, knockdown, phospho-Western in leukemia cells\",\n      \"pmids\": [\"30126842\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants choosing decay vs translational repression not resolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Promoter-binding studies established that MSI2 expression is set by specific transcription factors and that MSI2 engages autophagy machinery, identifying KLF4 as a repressor, ETV4 and HMGA2 as activators, and Beclin1 as an interactor.\",\n      \"evidence\": \"ChIP, luciferase reporters, Co-IP, ChIP-seq, functional rescue and xenografts\",\n      \"pmids\": [\"27449499\", \"31253395\", \"31053152\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect contributions to autophagy unclear\", \"Combinatorial regulation of the MSI2 promoter not integrated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Isoform-resolved and protein-interaction work showed MSI2 functions are context- and isoform-dependent, with MSI2a stabilizing TP53INP1 to restrain invasion and MSI2 controlling CAV1 protein stability.\",\n      \"evidence\": \"RIP, 3'UTR luciferase, isoform-specific assays, Co-IP and ubiquitylation assays\",\n      \"pmids\": [\"32448269\", \"32606289\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which MSI2 controls CAV1 ubiquitylation not defined\", \"Isoform-specific binding determinants not mapped\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Genetic and multi-omic studies broadened MSI2 into alternative splicing, miRNA processing, and non-hematopoietic stem cell biology, showing roles in photoreceptor exon usage, muscle stem cell differentiation, myofibroblast cytokine secretion, and C/EBPα-p30-driven AML.\",\n      \"evidence\": \"Conditional double KO retina, MSI2/HuR pri-miRNA processing in muscle stem cells, myofibroblast Col1a1-CreER KO, ATAC/ChIP/RNA-seq with CRISPR KO in AML\",\n      \"pmids\": [\"33168629\", \"34877814\", \"33609283\", \"33623142\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether splicing roles reflect direct nuclear MSI2 activity unclear\", \"Tissue-specific target sets only partly defined\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Integrated iCLIP/polysome and stability studies refined the model that MSI2 binds broadly but represses a high-density subset, while protein-stability and partner studies showed MSI2 is itself regulated by ubiquitination and recruited by LIN28.\",\n      \"evidence\": \"iCLIP with polysome profiling and acute depletion; Co-IP/ubiquitination assays; LIN28 CSD–RRM domain mapping and RIP\",\n      \"pmids\": [\"35528200\", \"35073459\", \"35102250\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Rules determining functional vs non-functional binding incomplete\", \"m6A-reader activity needs independent structural confirmation\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Target-specific studies expanded MSI2's regulatory repertoire to IRES-dependent translation, lipid metabolism, and NLK-driven invasion, showing it enhances cap-independent translation of MYC/JUN/VEGFA and represses FASN.\",\n      \"evidence\": \"RIP-seq, IRES reporter assays, fatty acid profiling, defined mRNA binding sites with in vivo metastasis models\",\n      \"pmids\": [\"37117191\", \"38059915\", \"39097735\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"IRES targets identified by RIP without structural binding confirmation\", \"Generality of IRES mechanism across targets unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Functional studies tied MSI2 to therapy resistance and additional biology, showing it controls ATM translation and DDR/PARP-inhibitor sensitivity, drives MYC-dependent chemoresistance in T-ALL, and supports muscle differentiation via autophagy.\",\n      \"evidence\": \"RIP, KP/KPM2 and Msi2-KO mouse models, single-cell RNA/TCR-seq of relapse pairs, autophagy rescue in myoblasts\",\n      \"pmids\": [\"37398283\", \"38659828\", \"37801708\", \"38373797\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs indirect link between MSI2 and ATM/autophagy not fully separated\", \"miRNA/AGO2 recruitment role still emerging\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Localization, interaction, and human genetic studies established how MSI2 is partitioned and how its dose matters, showing IPO7-mediated nuclear import forming an MSI2-MYC complex, β-catenin/LEF1 coupling, and a protective germline variant lowering HSC MSI2.\",\n      \"evidence\": \"Co-IP, NLS mutagenesis, fractionation, RIP/CLIP, TCF/LEF reporters, population genetics with ASXL1-mutant HSC competition\",\n      \"pmids\": [\"42066897\", \"40301545\", \"bio_10.1101_2025.03.24.645017\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal target driving the protective variant's effect not pinned\", \"Nuclear MSI2 functional repertoire incompletely defined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Isoform-resolved reconstitution distinguished cytoplasmic translation-promoting from nuclear chromatin-associated MSI2 activities, mapping localization signals and distinct interactomes.\",\n      \"evidence\": \"Tethered reporter assay, truncation/point mutagenesis, fractionation imaging, Co-IP/proteomics (preprint)\",\n      \"pmids\": [\"42239307\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Preprint, not yet peer-reviewed\", \"Physiological balance of isoforms across tissues unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved what structural and sequence features partition MSI2 binding into productive translational repression, activation, mRNA decay, m6A reading, and miRNA-processing outcomes across tissues.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unifying rule linking binding density/site to regulatory outcome\", \"No high-resolution structure of MSI2 in functional complexes (SYNCRIP, LIN28, IPO7-MYC)\", \"Isoform abundance and switching in vivo not quantified\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 2, 8, 19, 22]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [3, 19, 22, 39]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [8, 20, 21]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 18, 21, 38]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [31, 32]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [31, 32]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [8, 19, 22]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [3, 19, 39]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 7, 8, 29]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 4, 17, 27]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 15, 25, 35]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"SYNCRIP\", \"LIN28\", \"HuR\", \"Beclin1\", \"CAV1\", \"IPO7\", \"AGO2\", \"CTNNB1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}