{"gene":"CSDE1","run_date":"2026-04-28T17:28:53","timeline":{"discoveries":[{"year":1994,"finding":"UNR/CSDE1 protein has high affinity for single-stranded DNA or RNA and low affinity for double-stranded nucleic acids, and is predominantly localized in the cytoplasm with partial association with the endoplasmic reticulum, established by nucleic acid binding assays and fractionation.","method":"In vitro nucleic acid binding assays, subcellular fractionation, immunolocalization","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1-2 — direct biochemical binding assays plus fractionation with functional characterization; foundational paper","pmids":["7518919"],"is_preprint":false},{"year":1999,"finding":"UNR/CSDE1 binds purine-rich sequences with a consensus core motif (AAGUA/G or AACG) downstream of a purine stretch, with an apparent Kd of ~10 nM; multiple CSDs are required for high-affinity binding, with CSD1-2-3 and CSD1-2-3-4-5 combinations sufficient for high affinity.","method":"In vitro SELEX, RNA binding assays with individual CSD domain constructs","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 — in vitro reconstitution with SELEX and domain dissection","pmids":["10101203"],"is_preprint":false},{"year":1999,"finding":"UNR/CSDE1 is required for internal ribosome entry site (IRES)-dependent translation of human rhinovirus (HRV) RNA; it acts synergistically with PTB to stimulate HRV IRES-dependent translation. UNR interacts with p38/UNRIP (a GH-WD repeat protein), forming a complex recovered by RNA-affinity chromatography from HeLa cell extracts.","method":"RNA-affinity purification, co-immunoprecipitation, recombinant protein reconstitution in reticulocyte lysate translation assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1-2 — purification, co-IP, and functional reconstitution in a single foundational study; 216 citations","pmids":["10049359"],"is_preprint":false},{"year":2003,"finding":"Loss of UNR/CSDE1 in murine embryonic stem cells (unr−/− ES cells) severely impairs translation directed by the HRV IRES and the poliovirus IRES in vivo; reintroduction of Unr rescues IRES activity, demonstrating Unr as a specific IRES trans-acting factor (ITAF) for enterovirus/rhinovirus subgroup but not EMCV or FMDV.","method":"Homologous recombination knockout of unr gene in ES cells, dicistronic reporter assays, rescue by transient expression","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 — clean KO with defined molecular phenotype and genetic rescue; 99 citations","pmids":["12610110"],"is_preprint":false},{"year":2003,"finding":"UNR/CSDE1 and PTB act as RNA chaperones on the Apaf-1 IRES: UNR must prebind first, enabling PTB/nPTB to bind and remodel the IRES structure into a conformation that exposes the ribosome landing site as a single-stranded region, permitting translation initiation.","method":"RNA structural probing, mapping of UNR and PTB binding sites on Apaf-1 IRES, functional translation assays in cell-free systems and cell lines","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 — structural modeling combined with binding-site mapping and functional reconstitution; 209 citations","pmids":["12667457"],"is_preprint":false},{"year":2004,"finding":"UNR/CSDE1 is an mCRD (c-fos major coding-region determinant)-binding protein that also interacts with poly(A)-binding protein (PABP); the UNR-PABP interaction is necessary for the full destabilization function of the mCRD, and UNR associates with the poly(A) nuclease CCR4, coupling mRNA deadenylation/decay to ongoing translation.","method":"Co-immunoprecipitation, RNA-protein binding assays, functional mRNA decay assays with translation inhibitors, identification of CCR4 as associated nuclease","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods (co-IP, functional decay assays, translation inhibition); 130 citations","pmids":["15314026"],"is_preprint":false},{"year":2004,"finding":"All five cold-shock domains of UNR/CSDE1 are required for RNA binding to the HRV-2 IRES and for stimulation of IRES-dependent translation; point mutations in individual CSDs abolish both RNA binding and translational stimulation.","method":"Site-directed mutagenesis of individual CSDs, in vitro RNA binding assays, cell-free translation assays","journal":"The Journal of general virology","confidence":"High","confidence_rationale":"Tier 1 — mutagenesis of all five domains with direct in vitro functional readouts","pmids":["15269369"],"is_preprint":false},{"year":2005,"finding":"The PITSLRE IRES contains a Unr consensus binding site essential for IRES activity; Unr protein binds the PITSLRE IRES and is more prominently expressed at G2/M, where phosphorylation of eIF-2α has a permissive effect on PITSLRE IRES activity.","method":"Deletion analysis of IRES, UV cross-linking, cell-cycle-dependent expression analysis, eIF-2α phosphorylation assays","journal":"The Biochemical journal","confidence":"Medium","confidence_rationale":"Tier 2-3 — binding site mapping by deletion and crosslinking; single lab","pmids":["15330758"],"is_preprint":false},{"year":2005,"finding":"The 5'-UTR of UNR mRNA contains an IRES that is negatively regulated by PTB; PTB binds a pyrimidine-rich region (nt 335-355) in the UNR IRES and overexpression of PTB inhibits UNR IRES activity and UNR protein expression. Unr also negatively regulates its own IRES activity and interacts with its own mRNA in vivo, constituting a feedback loop.","method":"Dicistronic reporter assays, UV cross-linking, RNA affinity chromatography, RNAi depletion of PTB, IRES mutagenesis","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods; binding and functional data with controls","pmids":["15928332"],"is_preprint":false},{"year":2006,"finding":"In Drosophila, UNR is recruited by the female-specific protein SXL to the 3'-UTR of msl-2 mRNA; this requires SXL binding to uridine-rich sequences in the 3'-UTR, and UNR acts as a corepressor of msl-2 translation to ensure dosage compensation in females.","method":"Purification of translationally silenced msl-2 mRNPs, mass spectrometry identification of UNR, co-IP, functional translational repression assays in Drosophila","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — mRNP purification, MS identification, co-IP, functional assay; 76 citations","pmids":["16452508"],"is_preprint":false},{"year":2006,"finding":"Drosophila UNR interacts with SXL and is required for SXL-mediated repression of msl-2 mRNA translation; UNR binds to regulatory sequences in the msl-2 3'-UTR adjacent to SXL-bound uridine-rich sequences, conferring sex-specific translational repression.","method":"Co-immunoprecipitation, functional assays of msl-2 translation in Drosophila S2 cells, genetic analysis","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP and functional in vivo assays; 62 citations","pmids":["16452509"],"is_preprint":false},{"year":2006,"finding":"During mitosis, hnRNP C1/C2 proteins stimulate UNR IRES activity by binding to the UNR IRES, while PTB and Unr itself dissociate from the IRES, increasing UNR protein expression. UNR in turn contributes to PITSLRE IRES activity; siRNA knockdown of hnRNP C1/C2 or Unr abrogates or retards mitosis.","method":"IRES reporter assays during cell cycle stages, RNA-protein interaction assays, siRNA knockdown with mitosis progression readout","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2-3 — functional IRES assays with binding analysis and KD; single lab","pmids":["17159903"],"is_preprint":false},{"year":2007,"finding":"UNR/CSDE1 binds to two distinct secondary structure domains of the HRV-2 IRES and acts as an RNA chaperone to maintain the complex tertiary IRES structure required for translational competency.","method":"RNA binding site mapping, identification of specific nucleotides by mutagenesis, functional translation assays","journal":"The Journal of general virology","confidence":"Medium","confidence_rationale":"Tier 1-2 — binding site mapping with mutagenesis and functional assay; single lab","pmids":["17947529"],"is_preprint":false},{"year":2008,"finding":"The first cold-shock domain (CSD1) of Drosophila UNR is the domain required for interaction with SXL and msl-2 mRNA; three exposed residues within CSD1 are required for complex formation. Translational repression additionally requires the amino-terminal Q-rich stretch and the two first CSDs (first 397 aa), which constitute the translational effector domain.","method":"Gel-mobility shift assays with individual CSD domains, site-directed mutagenesis, tethering assays in cell-free translation systems","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 1-2 — domain dissection with mutagenesis and multiple functional assays","pmids":["18203923"],"is_preprint":false},{"year":2009,"finding":"The SXL-UNR corepressor complex inhibits ribosome recruitment to msl-2 mRNA via a PABP-dependent mechanism: UNR directly interacts with PABP, and the repressor complex acts after PABP-mediated recruitment of eIF4E/G to block ribosome binding.","method":"Direct biochemical assays for eIF4F and ribosome recruitment, co-IP of UNR with PABP, functional translation assays with poly(A) tail requirements","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 — reconstituted biochemical assays with multiple orthogonal approaches; 62 citations","pmids":["19941818"],"is_preprint":false},{"year":2010,"finding":"NMR solution structures of all five CSDs of human UNR were determined; CSD1 has altered sidechain conformations in its RNP-1 and RNP-2 RNA-binding motifs (involving F43, H45, C46, Y30) compared to other CSDs, correlating with its 20-fold higher RNA-binding activity relative to CSD5.","method":"Solution NMR structure determination of all five CSDs","journal":"Journal of structural and functional genomics","confidence":"High","confidence_rationale":"Tier 1 — direct NMR structural determination with functional correlation","pmids":["20213426"],"is_preprint":false},{"year":2011,"finding":"UNR/CSDE1 prevents differentiation of mouse embryonic stem cells into primitive endoderm by destabilizing Gata6 mRNAs; unr−/− ES cells spontaneously differentiate into PrE and re-expression of Unr reverses this phenotype.","method":"Knockout ES cell analysis, mRNA stability assays for Gata6, rescue by re-expression","journal":"Stem cells (Dayton, Ohio)","confidence":"Medium","confidence_rationale":"Tier 2-3 — KO with defined phenotype and molecular mechanism (mRNA destabilization); single lab","pmids":["21954113"],"is_preprint":false},{"year":2013,"finding":"shRNA-mediated knockdown of Csde1 in mice causes failure of precerebellar neurons to complete both tangential and radial migration to their target regions in the hindbrain, establishing a required role for Csde1 in neuronal migration.","method":"shRNA knockdown in vivo (mouse), neuronal migration tracking","journal":"Neuroscience","confidence":"Medium","confidence_rationale":"Tier 2-3 — in vivo KD with defined cellular phenotype; single lab","pmids":["24012837"],"is_preprint":false},{"year":2014,"finding":"Crystal structure (2.8 Å), NMR, and SAXS/SANS data of the ternary Sxl-Unr-msl2 mRNA complex reveal that the first CSD of Unr and two Sxl RRMs form intertwined interactions with RNA; cooperative complex formation increases RNA binding affinity ~1000-fold for the Unr CSD, and novel ternary RNA contacts including non-canonical contacts by the α1 helix of Sxl RRM1 are identified.","method":"X-ray crystallography (2.8 Å), NMR, SAXS, SANS","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 — atomic-resolution crystal structure plus NMR and SAXS validation; 99 citations","pmids":["25209665"],"is_preprint":false},{"year":2014,"finding":"Drosophila UNR promotes targeting of the male-specific lethal (MSL) dosage-compensation complex to the X chromosome by facilitating the interaction between the RNA helicase MLE and the long non-coding RNA roX2.","method":"Co-immunoprecipitation, RNA-binding assays, functional dosage compensation assays","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP and functional data; single lab","pmids":["25158899"],"is_preprint":false},{"year":2016,"finding":"UNR/CSDE1 stimulates translation in vitro through cold-shock domains 2 and 4, promotes binding of PABP1 to mRNA, and is required for the stable interaction of PABP1 and eIF4G in cells; siRNA knockdown of Unr reduces overall cellular translation and cap-dependent and IRES-dependent reporter translation.","method":"In vitro translation assays, CSD domain mutagenesis, co-IP of PABP1/eIF4G, siRNA knockdown with polysome/translation readouts","journal":"Scientific reports","confidence":"High","confidence_rationale":"Tier 1-2 — in vitro reconstitution with mutagenesis plus cellular co-IP and KD phenotype","pmids":["26936655"],"is_preprint":false},{"year":2016,"finding":"UNR/CSDE1 promotes melanoma invasion and metastasis by post-transcriptionally regulating a pro-metastatic RNA regulon; it controls target mRNAs including VIM and RAC1 at the levels of RNA steady-state and translation elongation/termination, as revealed by iCLIP, RNA-seq, and ribosome profiling.","method":"iCLIP-seq, RNA-seq, ribosome profiling, loss- and gain-of-function experiments in melanoma cells and mouse models","journal":"Cancer cell","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal genome-wide methods plus functional validation; 125 citations","pmids":["27908735"],"is_preprint":false},{"year":2017,"finding":"CSDE1/UNR is highly expressed in human embryonic stem cells and post-transcriptionally modulates core components of hESC identity and neurogenesis; it binds FABP7 and VIM mRNAs and regulates their stability and translation, and loss of CSDE1 accelerates neural differentiation while its ectopic expression impairs it.","method":"Loss- and gain-of-function (KO and OE), iCLIP, RNA-seq, ribosome profiling, RIP assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods with defined molecular targets; 60 citations","pmids":["29129916"],"is_preprint":false},{"year":2017,"finding":"UNR/CSDE1 is required in vivo for the formation of nucleoplasmic reticulum (NR) structures in polyploid cells (trophoblast giant cells, hepatocytes); these Unr-NRs are sites of active mRNA translation containing poly(A) RNA and translation factors, and are absent in Unr-null cells.","method":"Electron microscopy, live imaging, immunofluorescence with translation factor markers, Unr-null mouse analysis","journal":"Journal of cell science","confidence":"Medium","confidence_rationale":"Tier 2-3 — localization with functional consequence (translation) and KO validation; single lab","pmids":["28386023"],"is_preprint":false},{"year":2018,"finding":"CSDE1 directly interacts with BC200 lncRNA, and STRAP indirectly binds BC200 via heterodimerization with CSDE1; knockdown of BC200 causes redistribution of CSDE1 into nuclear foci, revealing a reciprocal regulatory relationship between CSDE1 and BC200.","method":"Mass spectrometry of BC200 RNP, co-IP, RNA truncation binding-site mapping, immunofluorescence after knockdown","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2-3 — MS identification confirmed by co-IP and functional localization data; single lab","pmids":["30247708"],"is_preprint":false},{"year":2018,"finding":"Csde1 binds mRNAs encoding proteins involved in protein homeostasis (ribogenesis, translation, protein degradation) in erythroid cells; deletion of CSD1 by CRISPR-Cas9 affects both mRNA and protein expression of Csde1-bound transcripts (e.g., enhanced Pabpc1 protein with reduced Pabpc1 mRNA, suggesting more efficient translation followed by feedback mRNA destabilization).","method":"RNA-IP, CRISPR-Cas9 CSD1 deletion, RNA-seq, proteomics","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 — RIP, CRISPR, and multi-omics; single lab","pmids":["29422612"],"is_preprint":false},{"year":2018,"finding":"STRAP/UNRIP (the unr-interacting protein) is the most strongly associated protein with Csde1 in erythroblasts; Strap knockdown alters mRNA and/or protein expression of several Csde1-bound transcripts (Hmbs, eIF4g3, Pabpc4, Vim, Elavl1) without changing the pool of Csde1-bound transcripts.","method":"Co-IP/mass spectrometry, Strap knockdown, RNA-seq, proteomics","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP plus functional KD; single lab","pmids":["30138317"],"is_preprint":false},{"year":2019,"finding":"CSDE1 loss-of-function in mouse cortical neurons causes overgrowth of neurites, abnormal dendritic spine morphology, impaired synapse formation, and impaired synaptic transmission; HITS-CLIP shows Csde1-binding targets are enriched in autism-associated and FMRP target gene sets involved in neuronal development and synaptic plasticity.","method":"HITS-CLIP, Csde1 knockdown in primary mouse cortical neurons (morphology/synapse readouts), Drosophila mutant synapse assays","journal":"Science advances","confidence":"High","confidence_rationale":"Tier 2 — HITS-CLIP, KD with defined cellular phenotype, cross-species validation; 37 citations","pmids":["31579823"],"is_preprint":false},{"year":2021,"finding":"CSDE1 interacts with AGO2 (the essential miRISC component) via target mRNAs, dependent on the first cold-shock domain (CSD1) of CSDE1; CSDE1 counters AGO2 binding to the 3'-UTR of PMEPA1, attenuating miR-129-5p/AGO2-mediated silencing of PMEPA1 and increasing PMEPA1 expression in melanoma.","method":"Co-IP of CSDE1 with AGO2, RNA-IP, competitive binding assays, CSD domain dependency experiments, functional reporter assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 — co-IP, binding competition, domain mutagenesis, functional assays; multiple orthogonal methods","pmids":["33833398"],"is_preprint":false},{"year":2021,"finding":"CSDE1 promotes STAT1 dephosphorylation by stabilizing T cell protein tyrosine phosphatase (TCPTP) mRNA/protein, thereby reducing tumor immunogenicity; SMYD3 mediates H3K4 trimethylation of the CSDE1 locus via mechanotransduction, linking epigenetic regulation to CSDE1-mediated immune evasion.","method":"RNA-seq, CSDE1 overexpression/knockdown, STAT1 phosphorylation assays, chromatin IP for H3K4me3 at CSDE1 locus, TCPTP binding assays","journal":"Science translational medicine","confidence":"Medium","confidence_rationale":"Tier 2-3 — multiple functional assays but mechanistic details require further validation; single study","pmids":["36724242"],"is_preprint":false},{"year":2022,"finding":"UNR/CSDE1 enables oncogene-induced senescence (OIS) in primary mouse keratinocytes by two independent mechanisms: (1) enhancing stability of SASP factor mRNAs and (2) repressing translation of Ybx1 mRNA; depletion of CSDE1 leads to senescence bypass, immortalization, and tumor formation (CSDE1 functions as a tumor suppressor in this context).","method":"CSDE1 depletion in primary keratinocytes, high-throughput transcriptomics and translatome profiling, mRNA stability and translation assays, in vivo tumor formation","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 — unbiased high-throughput analyses plus functional validation with multiple orthogonal methods; 23 citations","pmids":["35021076"],"is_preprint":false},{"year":2022,"finding":"The lncRNA ARHGAP5-AS1 stabilizes CSDE1 protein by attenuating interactions between CSDE1 and the E3 ubiquitin ligase TRIM28, preventing CSDE1 degradation via the ubiquitin-proteasome pathway; elevated CSDE1 promotes translation of VIM and RAC1 and activates the ERK pathway in HCC.","method":"Co-IP of CSDE1 with TRIM28, ubiquitination assays, lncRNA-protein interaction assays, functional cancer cell assays","journal":"Clinical and translational medicine","confidence":"Medium","confidence_rationale":"Tier 2-3 — co-IP identifying E3 ligase, ubiquitination assays, functional data; single lab","pmids":["36354136"],"is_preprint":false},{"year":2022,"finding":"UNR/CSDE1 interacts with HIV-1 Gag (via its NC domain) and NCp7 as confirmed by co-immunoprecipitation and FRET-FLIM; UNR acts as an ITAF increasing HIV-1 IRES-dependent translation, while NCp7 counteracts this stimulatory effect; Unr knockdown decreases infection by a non-replicative lentivector.","method":"Co-immunoprecipitation, FRET-FLIM, dual luciferase IRES assay, IRES point mutation analysis, siRNA knockdown","journal":"Viruses","confidence":"Medium","confidence_rationale":"Tier 2 — co-IP confirmed by FRET-FLIM plus functional IRES assays; single lab","pmids":["36016420"],"is_preprint":false},{"year":2023,"finding":"CSDE1 promotes biogenesis of miR-451 in erythroid cells by binding pre-miR-451 and regulating AGO2 processing through its N-terminal domains; CSDE1 further interacts with PARN and promotes trimming of intermediate miR-451 to mature length.","method":"RNA-IP, in vitro AGO2 processing assays, domain dependency studies, PARN interaction assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 — in vitro processing assay plus domain-dependency experiments; single lab","pmids":["37493604"],"is_preprint":false},{"year":2023,"finding":"Csde1 binds ctnnb1 mRNAs (encoding β-catenin) and enhances their translation without altering mRNA stability in zebrafish embryos, thereby increasing β-catenin protein levels and Wnt/β-catenin signaling activity required for HSPC generation during embryonic development.","method":"Csde1 genetic mutants and morpholino knockdown in zebrafish, RIP assays for ctnnb1 mRNA, polysome profiling, mRNA stability assays","journal":"Development (Cambridge, England)","confidence":"Medium","confidence_rationale":"Tier 2-3 — genetic mutants with RIP and translational control assays; single lab","pmids":["37874038"],"is_preprint":false},{"year":2025,"finding":"The Csde1-Strap complex binds Bach2 mRNA and couples its decay with translation to restrain the magnitude and duration of Bach2 protein expression during B-cell differentiation; in the absence of Csde1 or Strap, Bach2 translation is decoupled from mRNA decay, leading to elevated and prolonged Bach2 protein and impaired plasma cell differentiation.","method":"RNA interactome capture-coupled CRISPR/Cas9 functional screening, co-IP of Csde1-Strap complex, RIP for Bach2 mRNA, mRNA stability and translation assays in B cells","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 — CRISPR screen plus co-IP, RIP, and mRNA decay/translation mechanistic assays; 2 citations but comprehensive","pmids":["40133358"],"is_preprint":false},{"year":2025,"finding":"CSDE1 is phosphorylated early during melanoma cellular transformation, and this phosphorylation correlates with changes in its subcellular localization and increased interactions with ribosomes; CSDE1 phosphorylation promotes ribosome association in melanoma cells compared to healthy melanocytes.","method":"Long-read Nanopore sequencing, 2D gel electrophoresis, interactome proteomics, phosphorylation site mapping, subcellular fractionation","journal":"RNA (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 — extensive interactome and PTM analysis with localization data; single study","pmids":["40883018"],"is_preprint":false},{"year":2025,"finding":"CSDE1 directly binds the 3'-UTR of Cdk6 mRNA and maintains its stability, thereby sustaining Cdk6 levels required for the G1/S transition; Csde1 knockout in mouse cortex extends G1 phase duration in neural progenitors, causing impaired proliferation, abnormal cortical lamination, and embryonic lethality.","method":"Csde1 conditional KO in mouse cortex, CLIP-seq for 3'-UTR binding, Cdk6 mRNA stability assays, dual thymidine cell cycle labeling","journal":"Neuroscience bulletin","confidence":"Medium","confidence_rationale":"Tier 2 — CLIP, KO phenotype, and molecular target validation; single study","pmids":["40555862"],"is_preprint":false},{"year":2025,"finding":"CSDE1 stabilizes AGO2 protein in mouse embryonic stem cells by preventing AGO2 ubiquitination; this stabilization is dependent on CSD1 (the first cold-shock domain), and CSDE1 also stabilizes pluripotency proteins NANOG, SOX2, and Oct4.","method":"CSDE1 KD/OE, ubiquitination assays for AGO2, CSD1 domain-dependency experiments, Western blotting for pluripotency markers","journal":"Frontiers in molecular biosciences","confidence":"Medium","confidence_rationale":"Tier 2-3 — ubiquitination assays with domain dependency; single lab","pmids":["41624769"],"is_preprint":false},{"year":2025,"finding":"CSDE1 contributes to AGO2-mediated cleavage of the passenger strand miR-486-3p to facilitate miR-486-5p maturation; loss of CSDE1 increases miR-486-3p levels, decreases in vitro cleavage efficiency, and derepresses miR-486-5p targets; the function requires CSD1 for AGO2 interaction.","method":"In vitro AGO2 duplex cleavage assays, CSDE1 KO/rescue, miRNA quantification, CSD1 domain analysis","journal":"RNA biology","confidence":"Medium","confidence_rationale":"Tier 1-2 — in vitro reconstitution assay plus cellular KO and domain-dependency; single lab","pmids":["41905768"],"is_preprint":false},{"year":2026,"finding":"MKRN2 E3 ubiquitin ligase directly ubiquitinates CSDE1 at four lysine residues (K81, K91, K208, K727); MKRN2 and CSDE1 form co-localized condensates via liquid-liquid phase separation, and disruption of either protein abolishes condensate formation; Mkrn2 KO mice show sex-specific social abnormalities consistent with ASD.","method":"Mass spectrometry identification of CSDE1 as MKRN2 substrate, mutagenesis of ubiquitination sites, LLPS assays, Mkrn2 KO mouse behavioral assays","journal":"Frontiers in cellular neuroscience","confidence":"Medium","confidence_rationale":"Tier 2 — MS identification, mutagenesis, and LLPS assays; single lab, newly published","pmids":["41757349"],"is_preprint":false},{"year":2025,"finding":"CSDE1 enhances genotoxic drug resistance by forming a ternary CSDE1-eIF3a-RPA2 mRNA complex that upregulates RPA2 expression and nucleotide excision repair/homologous recombination pathways; systemic CSDE1 KO in mice increases DNA damage in response to irradiation; CSDE1 inhibits the cGAS-STING pathway through RPA2.","method":"Biotin pull-down, EMSA, co-IP for ternary complex characterization, CSDE1 KO mouse models with DNA damage assays, cGAS-STING pathway analysis","journal":"Drug resistance updates","confidence":"Medium","confidence_rationale":"Tier 2 — multiple biochemical assays plus in vivo KO model; single lab","pmids":["40398074"],"is_preprint":false},{"year":1996,"finding":"UNR/CSDE1 interacts with the N-terminal segment of the ALL-1 (MLL) protein; two CSDs and two intervening polypeptides of UNR constitute the minimal region required for this interaction, confirmed by in vitro binding and co-immunoprecipitation from COS cells.","method":"Yeast two-hybrid screening, in vitro binding assays, co-immunoprecipitation","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2-3 — two-hybrid plus in vitro binding and co-IP; single lab","pmids":["8934551"],"is_preprint":false}],"current_model":"CSDE1/UNR is a multi-CSD cytoplasmic RNA-binding protein that post-transcriptionally regulates gene expression by modulating mRNA translation (both internal initiation and cap-dependent), mRNA stability, and miRNA biogenesis; it acts as an RNA chaperone at viral and cellular IRES elements (synergizing with PTB), couples mRNA deadenylation/decay to translation via interactions with PABP and CCR4, represses msl-2 translation through a SXL-UNR-PABP ternary mechanism, promotes miR-451 maturation and miR-486 passenger-strand cleavage via AGO2 interaction dependent on CSD1, is phosphorylated during melanoma transformation to drive ribosome association, and controls cell fate decisions in stem cells, neurons, B cells, and erythroid progenitors through coordinated post-transcriptional regulons."},"narrative":{"teleology":[{"year":1994,"claim":"Establishing that UNR is a cytoplasmic single-stranded nucleic acid–binding protein resolved its basic biochemical identity and subcellular context.","evidence":"In vitro binding assays and subcellular fractionation/immunolocalization in mammalian cells","pmids":["7518919"],"confidence":"High","gaps":["Physiological RNA targets unknown","No functional role assigned","Mechanism of cytoplasmic retention undefined"]},{"year":1999,"claim":"Defining UNR's RNA-binding specificity (purine-rich AAGUA/G motif, ~10 nM Kd) and demonstrating that multiple CSDs cooperate for high-affinity binding established the modular logic of its RNA recognition.","evidence":"SELEX with recombinant UNR, domain dissection with truncated CSD constructs","pmids":["10101203"],"confidence":"High","gaps":["Structural basis for multi-CSD cooperativity unknown","In vivo target repertoire not mapped"]},{"year":1999,"claim":"Identifying UNR as an IRES trans-acting factor (ITAF) that synergizes with PTB to drive HRV IRES-dependent translation, and discovering its partner UNRIP/STRAP, established its first functional role in translational control.","evidence":"RNA-affinity purification from HeLa extracts, co-IP, reconstitution in reticulocyte lysate translation assays","pmids":["10049359"],"confidence":"High","gaps":["Mechanism of synergy with PTB unresolved","Role of UNRIP/STRAP in IRES activity unclear"]},{"year":2003,"claim":"Demonstrating that UNR acts as an RNA chaperone on the Apaf-1 IRES—prebinding to remodel RNA structure and expose the ribosome landing site for PTB—provided a mechanistic framework for ITAF function beyond simple recruitment.","evidence":"RNA structural probing, binding-site mapping, and functional translation assays with ordered addition of UNR and PTB","pmids":["12667457","12610110"],"confidence":"High","gaps":["Generalizability of ordered-chaperone model to other cellular IRESes untested","No structural model at atomic resolution"]},{"year":2004,"claim":"Linking UNR to mRNA decay via the c-fos mCRD showed that UNR couples translation to deadenylation through interactions with PABP and CCR4, establishing a translation-dependent mRNA destabilization mechanism.","evidence":"Co-IP of UNR with PABP and CCR4, functional mRNA decay assays with translation inhibitors","pmids":["15314026"],"confidence":"High","gaps":["Direct enzymatic role versus scaffolding function not distinguished","Whether this mechanism generalizes beyond c-fos unclear"]},{"year":2006,"claim":"Identification of Drosophila UNR as a corepressor recruited by SXL to silence msl-2 translation revealed a sex-specific translational repression mechanism and expanded UNR's roles beyond IRES activation to include translational inhibition.","evidence":"mRNP purification with MS identification, co-IP, translational repression assays in Drosophila S2 cells","pmids":["16452508","16452509"],"confidence":"High","gaps":["Human ortholog involvement in analogous repression unknown","Mechanism of ribosome exclusion not yet defined"]},{"year":2009,"claim":"Reconstituting the SXL-UNR-PABP ternary repression mechanism showed that the complex blocks 43S ribosome recruitment after eIF4F assembly, defining the step at which translational repression occurs.","evidence":"Biochemical assays measuring eIF4F and ribosome recruitment with purified components and poly(A)-dependent translation","pmids":["19941818"],"confidence":"High","gaps":["Structural basis for ribosome exclusion at atomic level unknown","Whether PABP interaction is required for all UNR-mediated repression unclear"]},{"year":2010,"claim":"Solving NMR structures of all five human CSDs revealed that CSD1 has distinctive RNP motif conformations correlating with its superior RNA-binding affinity, providing a structural rationale for domain-specific functions.","evidence":"Solution NMR of all five isolated CSD domains","pmids":["20213426"],"confidence":"High","gaps":["Full-length protein structure unavailable","Inter-domain arrangements and RNA-bound conformations unresolved"]},{"year":2014,"claim":"The 2.8 Å crystal structure of the Sxl-Unr CSD1-msl2 RNA ternary complex revealed intertwined protein–RNA contacts and a ~1000-fold cooperative increase in Unr CSD1 RNA affinity, providing the first atomic-resolution view of UNR in a functional complex.","evidence":"X-ray crystallography, NMR, SAXS, and SANS of the ternary complex","pmids":["25209665"],"confidence":"High","gaps":["Structure includes only CSD1; multi-CSD architecture on RNA unknown","Applicability to mammalian complexes not demonstrated structurally"]},{"year":2011,"claim":"Showing that UNR-null ES cells spontaneously differentiate into primitive endoderm due to Gata6 mRNA stabilization established CSDE1 as a gatekeeper of stem cell fate through mRNA destabilization.","evidence":"Unr−/− ES cell analysis, Gata6 mRNA stability assays, rescue by re-expression","pmids":["21954113"],"confidence":"Medium","gaps":["Whether Gata6 is a direct binding target or indirect effect not fully resolved","Signaling pathways upstream of UNR in this context unknown"]},{"year":2016,"claim":"Genome-wide iCLIP and ribosome profiling in melanoma revealed a CSDE1-regulated pro-metastatic RNA regulon (including VIM and RAC1), positioning CSDE1 as a post-transcriptional driver of cancer invasion.","evidence":"iCLIP-seq, RNA-seq, ribosome profiling, loss/gain-of-function in melanoma cells and mouse xenografts","pmids":["27908735"],"confidence":"High","gaps":["Regulatory logic distinguishing stabilization versus translational targets unclear","Upstream signals activating CSDE1 in melanoma not identified"]},{"year":2016,"claim":"Demonstrating that CSD2 and CSD4 stimulate cap-dependent translation and that CSDE1 stabilizes the PABP1–eIF4G interaction showed that CSDE1 functions as a general translation enhancer beyond IRES contexts.","evidence":"In vitro translation with CSD mutants, co-IP of PABP1/eIF4G, siRNA knockdown with polysome analysis","pmids":["26936655"],"confidence":"High","gaps":["Whether this general stimulation is RNA target-selective in vivo unclear","Mechanism of CSD2/CSD4 specificity not structurally resolved"]},{"year":2017,"claim":"CSDE1 was shown to regulate human embryonic stem cell identity and neurogenesis by binding and controlling FABP7 and VIM mRNA stability/translation, extending its stem cell role to human pluripotency.","evidence":"KO/OE in hESCs, iCLIP, RNA-seq, ribosome profiling","pmids":["29129916"],"confidence":"High","gaps":["How CSDE1 switches between mRNA stabilization and destabilization on different targets unclear"]},{"year":2019,"claim":"HITS-CLIP in neurons combined with functional knockdown showed that CSDE1 controls neurite outgrowth, dendritic spine morphology, and synapse formation, with targets enriched for autism-associated and FMRP target genes.","evidence":"HITS-CLIP in mouse cortical neurons, CSDE1 KD with morphological and electrophysiological readouts, cross-validated in Drosophila","pmids":["31579823"],"confidence":"High","gaps":["Direct causal link to autism spectrum disorder in humans not established genetically","Which specific target mRNAs mediate synapse phenotype unknown"]},{"year":2022,"claim":"CSDE1 was found to enable oncogene-induced senescence by stabilizing SASP factor mRNAs and repressing Ybx1 translation, revealing a context-dependent tumor-suppressor function opposing its pro-metastatic role in melanoma.","evidence":"CSDE1 depletion in primary keratinocytes, transcriptome/translatome profiling, in vivo tumor formation assays","pmids":["35021076"],"confidence":"High","gaps":["How cell type determines whether CSDE1 acts as oncogene or tumor suppressor unresolved","Post-translational modifications governing context-specificity not systematically mapped"]},{"year":2023,"claim":"Demonstrating that CSDE1 promotes AGO2-dependent miR-451 maturation and PARN-mediated trimming expanded its functional repertoire to miRNA biogenesis, with CSD1-dependent AGO2 interaction as the critical determinant.","evidence":"RNA-IP, in vitro AGO2 processing assays, domain-dependency studies, PARN interaction assays in erythroid cells","pmids":["37493604"],"confidence":"Medium","gaps":["Whether CSDE1 affects biogenesis of miRNAs beyond miR-451 and miR-486 broadly untested","Structural basis for CSD1-AGO2 interaction unknown"]},{"year":2025,"claim":"The Csde1-Strap complex was shown to couple Bach2 mRNA decay with translation during B-cell differentiation, demonstrating that the translation–decay coupling mechanism originally described for c-fos operates in a physiological cell fate decision.","evidence":"RNA interactome capture-coupled CRISPR screen, co-IP of Csde1-Strap, RIP for Bach2 mRNA, mRNA stability and translation assays in B cells","pmids":["40133358"],"confidence":"High","gaps":["Whether Strap is required for all CSDE1-mediated decay coupling or only specific targets unknown","Deadenylase identity in the B-cell context not confirmed"]},{"year":2025,"claim":"CSDE1 phosphorylation during melanoma transformation correlates with enhanced ribosome association, suggesting post-translational modification as a mechanism switching CSDE1 activity in cancer.","evidence":"2D gel electrophoresis, phosphorylation site mapping, interactome proteomics, subcellular fractionation comparing melanocytes and melanoma cells","pmids":["40883018"],"confidence":"Medium","gaps":["Kinase(s) responsible for CSDE1 phosphorylation not identified","Causal relationship between phosphorylation and ribosome binding not demonstrated by mutagenesis"]},{"year":2025,"claim":"CSDE1 was found to stabilize Cdk6 mRNA via 3′-UTR binding to sustain G1/S progression in neural progenitors, with conditional KO causing extended G1, impaired proliferation, and cortical lamination defects.","evidence":"Conditional KO in mouse cortex, CLIP-seq for Cdk6 3′-UTR, mRNA stability assays, cell-cycle labeling","pmids":["40555862"],"confidence":"Medium","gaps":["Whether Cdk6 is the sole essential target mediating the cortical phenotype not tested by epistasis","Interaction with cell-cycle-dependent CSDE1 regulation (IRES at G2/M) not integrated"]},{"year":null,"claim":"Key unresolved questions include: what determines whether CSDE1 stabilizes versus destabilizes a given mRNA target; what kinases phosphorylate CSDE1 and how this switches its activity; and what is the full-length multi-CSD architecture on RNA.","evidence":"","pmids":[],"confidence":"Low","gaps":["No full-length CSDE1 structure available","Rules governing target-specific stabilization versus destabilization unknown","Kinase-substrate relationships for CSDE1 phosphorylation not identified","Systematic assessment of CSDE1 in miRNA biogenesis beyond miR-451/miR-486 lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,1,6,15]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[9,10,14,20,22]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[5,28,33,39]},{"term_id":"GO:0044183","term_label":"protein folding chaperone","supporting_discovery_ids":[4,12]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,20,36]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[36,20]}],"pathway":[{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[2,4,20,22]},{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[33,39]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[17,27,37]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[21,30]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[29]}],"complexes":["CSDE1-STRAP/UNRIP complex","SXL-UNR-PABP translational repression complex"],"partners":["STRAP","PABPC1","PTB","AGO2","SXL","PARN","TRIM28","MKRN2"],"other_free_text":[]},"mechanistic_narrative":"CSDE1 (UNR) is a cytoplasmic RNA-binding protein containing five cold-shock domains (CSDs) that functions as a master post-transcriptional regulator of mRNA translation, stability, and miRNA biogenesis across diverse cell types. It acts as an RNA chaperone at viral and cellular IRES elements—remodeling RNA structure cooperatively with PTB to expose ribosome landing sites—and stimulates cap-dependent translation by promoting PABP1–eIF4G interactions through CSD2 and CSD4 [PMID:12667457, PMID:26936655]. CSDE1 couples translation to mRNA decay via its interaction with PABP and the CCR4 deadenylase, thereby controlling the expression kinetics of target mRNAs including c-fos, Gata6, Bach2, VIM, and Cdk6 in contexts ranging from stem cell self-renewal and neuronal migration to B-cell differentiation and melanoma metastasis [PMID:15314026, PMID:27908735, PMID:40133358, PMID:40555862]. CSDE1 additionally participates in miRNA maturation by interacting with AGO2 through CSD1 to promote miR-451 processing and miR-486 passenger-strand cleavage, and in Drosophila it serves as a sex-specific translational corepressor of msl-2 mRNA in a ternary complex with SXL and PABP [PMID:37493604, PMID:41905768, PMID:25209665]."},"prefetch_data":{"uniprot":{"accession":"O75534","full_name":"Cold shock domain-containing protein E1","aliases":["N-ras upstream gene protein","Protein UNR"],"length_aa":798,"mass_kda":88.9,"function":"RNA-binding protein involved in translationally coupled mRNA turnover (PubMed:11051545, PubMed:15314026). Implicated with other RNA-binding proteins in the cytoplasmic deadenylation/translational and decay interplay of the FOS mRNA mediated by the major coding-region determinant of instability (mCRD) domain (PubMed:11051545, PubMed:15314026). Required for efficient formation of stress granules (PubMed:29395067) (Microbial infection) Required for internal initiation of translation of human rhinovirus RNA","subcellular_location":"Cytoplasm; Cytoplasm, Stress granule; Cytoplasm, P-body","url":"https://www.uniprot.org/uniprotkb/O75534/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CSDE1","classification":"Not Classified","n_dependent_lines":309,"n_total_lines":1208,"dependency_fraction":0.25579470198675497},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CAPZB","stoichiometry":0.2},{"gene":"LSM14B","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/CSDE1","total_profiled":1310},"omim":[{"mim_id":"605986","title":"SERINE/THREONINE KINASE RECEPTOR-ASSOCIATED PROTEIN; STRAP","url":"https://www.omim.org/entry/605986"},{"mim_id":"191510","title":"COLD-SHOCK DOMAIN-CONTAINING E1, RNA-BINDING; CSDE1","url":"https://www.omim.org/entry/191510"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Endoplasmic reticulum","reliability":"Additional"},{"location":"Golgi apparatus","reliability":"Additional"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"skeletal muscle","ntpm":1250.0}],"url":"https://www.proteinatlas.org/search/CSDE1"},"hgnc":{"alias_symbol":["D1S155E","UNR"],"prev_symbol":[]},"alphafold":{"accession":"O75534","domains":[{"cath_id":"2.40.50.140","chopping":"24-88","consensus_level":"high","plddt":86.1782,"start":24,"end":88},{"cath_id":"2.40.50.140","chopping":"98-109_123-179","consensus_level":"medium","plddt":85.503,"start":98,"end":179},{"cath_id":"2.40.50.140","chopping":"184-246","consensus_level":"medium","plddt":92.2856,"start":184,"end":246},{"cath_id":"2.40.50.140","chopping":"255-341","consensus_level":"medium","plddt":89.2355,"start":255,"end":341},{"cath_id":"2.40.50.140","chopping":"347-411","consensus_level":"medium","plddt":88.0488,"start":347,"end":411},{"cath_id":"2.40.50.140","chopping":"426-439_455-510","consensus_level":"medium","plddt":75.7353,"start":426,"end":510},{"cath_id":"2.40.50.140","chopping":"518-580","consensus_level":"medium","plddt":82.7027,"start":518,"end":580},{"cath_id":"2.40.50.140","chopping":"591-671","consensus_level":"high","plddt":84.8858,"start":591,"end":671},{"cath_id":"2.40.50.140","chopping":"675-738","consensus_level":"high","plddt":85.342,"start":675,"end":738}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O75534","model_url":"https://alphafold.ebi.ac.uk/files/AF-O75534-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O75534-F1-predicted_aligned_error_v6.png","plddt_mean":79.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CSDE1","jax_strain_url":"https://www.jax.org/strain/search?query=CSDE1"},"sequence":{"accession":"O75534","fasta_url":"https://rest.uniprot.org/uniprotkb/O75534.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O75534/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O75534"}},"corpus_meta":[{"pmid":"10049359","id":"PMC_10049359","title":"unr, 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immunolocalization\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — direct biochemical binding assays plus fractionation with functional characterization; foundational paper\",\n      \"pmids\": [\"7518919\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"UNR/CSDE1 binds purine-rich sequences with a consensus core motif (AAGUA/G or AACG) downstream of a purine stretch, with an apparent Kd of ~10 nM; multiple CSDs are required for high-affinity binding, with CSD1-2-3 and CSD1-2-3-4-5 combinations sufficient for high affinity.\",\n      \"method\": \"In vitro SELEX, RNA binding assays with individual CSD domain constructs\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — in vitro reconstitution with SELEX and domain dissection\",\n      \"pmids\": [\"10101203\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"UNR/CSDE1 is required for internal ribosome entry site (IRES)-dependent translation of human rhinovirus (HRV) RNA; it acts synergistically with PTB to stimulate HRV IRES-dependent translation. UNR interacts with p38/UNRIP (a GH-WD repeat protein), forming a complex recovered by RNA-affinity chromatography from HeLa cell extracts.\",\n      \"method\": \"RNA-affinity purification, co-immunoprecipitation, recombinant protein reconstitution in reticulocyte lysate translation assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — purification, co-IP, and functional reconstitution in a single foundational study; 216 citations\",\n      \"pmids\": [\"10049359\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Loss of UNR/CSDE1 in murine embryonic stem cells (unr−/− ES cells) severely impairs translation directed by the HRV IRES and the poliovirus IRES in vivo; reintroduction of Unr rescues IRES activity, demonstrating Unr as a specific IRES trans-acting factor (ITAF) for enterovirus/rhinovirus subgroup but not EMCV or FMDV.\",\n      \"method\": \"Homologous recombination knockout of unr gene in ES cells, dicistronic reporter assays, rescue by transient expression\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — clean KO with defined molecular phenotype and genetic rescue; 99 citations\",\n      \"pmids\": [\"12610110\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"UNR/CSDE1 and PTB act as RNA chaperones on the Apaf-1 IRES: UNR must prebind first, enabling PTB/nPTB to bind and remodel the IRES structure into a conformation that exposes the ribosome landing site as a single-stranded region, permitting translation initiation.\",\n      \"method\": \"RNA structural probing, mapping of UNR and PTB binding sites on Apaf-1 IRES, functional translation assays in cell-free systems and cell lines\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — structural modeling combined with binding-site mapping and functional reconstitution; 209 citations\",\n      \"pmids\": [\"12667457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"UNR/CSDE1 is an mCRD (c-fos major coding-region determinant)-binding protein that also interacts with poly(A)-binding protein (PABP); the UNR-PABP interaction is necessary for the full destabilization function of the mCRD, and UNR associates with the poly(A) nuclease CCR4, coupling mRNA deadenylation/decay to ongoing translation.\",\n      \"method\": \"Co-immunoprecipitation, RNA-protein binding assays, functional mRNA decay assays with translation inhibitors, identification of CCR4 as associated nuclease\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods (co-IP, functional decay assays, translation inhibition); 130 citations\",\n      \"pmids\": [\"15314026\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"All five cold-shock domains of UNR/CSDE1 are required for RNA binding to the HRV-2 IRES and for stimulation of IRES-dependent translation; point mutations in individual CSDs abolish both RNA binding and translational stimulation.\",\n      \"method\": \"Site-directed mutagenesis of individual CSDs, in vitro RNA binding assays, cell-free translation assays\",\n      \"journal\": \"The Journal of general virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — mutagenesis of all five domains with direct in vitro functional readouts\",\n      \"pmids\": [\"15269369\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The PITSLRE IRES contains a Unr consensus binding site essential for IRES activity; Unr protein binds the PITSLRE IRES and is more prominently expressed at G2/M, where phosphorylation of eIF-2α has a permissive effect on PITSLRE IRES activity.\",\n      \"method\": \"Deletion analysis of IRES, UV cross-linking, cell-cycle-dependent expression analysis, eIF-2α phosphorylation assays\",\n      \"journal\": \"The Biochemical journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — binding site mapping by deletion and crosslinking; single lab\",\n      \"pmids\": [\"15330758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The 5'-UTR of UNR mRNA contains an IRES that is negatively regulated by PTB; PTB binds a pyrimidine-rich region (nt 335-355) in the UNR IRES and overexpression of PTB inhibits UNR IRES activity and UNR protein expression. Unr also negatively regulates its own IRES activity and interacts with its own mRNA in vivo, constituting a feedback loop.\",\n      \"method\": \"Dicistronic reporter assays, UV cross-linking, RNA affinity chromatography, RNAi depletion of PTB, IRES mutagenesis\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods; binding and functional data with controls\",\n      \"pmids\": [\"15928332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"In Drosophila, UNR is recruited by the female-specific protein SXL to the 3'-UTR of msl-2 mRNA; this requires SXL binding to uridine-rich sequences in the 3'-UTR, and UNR acts as a corepressor of msl-2 translation to ensure dosage compensation in females.\",\n      \"method\": \"Purification of translationally silenced msl-2 mRNPs, mass spectrometry identification of UNR, co-IP, functional translational repression assays in Drosophila\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — mRNP purification, MS identification, co-IP, functional assay; 76 citations\",\n      \"pmids\": [\"16452508\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Drosophila UNR interacts with SXL and is required for SXL-mediated repression of msl-2 mRNA translation; UNR binds to regulatory sequences in the msl-2 3'-UTR adjacent to SXL-bound uridine-rich sequences, conferring sex-specific translational repression.\",\n      \"method\": \"Co-immunoprecipitation, functional assays of msl-2 translation in Drosophila S2 cells, genetic analysis\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP and functional in vivo assays; 62 citations\",\n      \"pmids\": [\"16452509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"During mitosis, hnRNP C1/C2 proteins stimulate UNR IRES activity by binding to the UNR IRES, while PTB and Unr itself dissociate from the IRES, increasing UNR protein expression. UNR in turn contributes to PITSLRE IRES activity; siRNA knockdown of hnRNP C1/C2 or Unr abrogates or retards mitosis.\",\n      \"method\": \"IRES reporter assays during cell cycle stages, RNA-protein interaction assays, siRNA knockdown with mitosis progression readout\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — functional IRES assays with binding analysis and KD; single lab\",\n      \"pmids\": [\"17159903\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"UNR/CSDE1 binds to two distinct secondary structure domains of the HRV-2 IRES and acts as an RNA chaperone to maintain the complex tertiary IRES structure required for translational competency.\",\n      \"method\": \"RNA binding site mapping, identification of specific nucleotides by mutagenesis, functional translation assays\",\n      \"journal\": \"The Journal of general virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — binding site mapping with mutagenesis and functional assay; single lab\",\n      \"pmids\": [\"17947529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The first cold-shock domain (CSD1) of Drosophila UNR is the domain required for interaction with SXL and msl-2 mRNA; three exposed residues within CSD1 are required for complex formation. Translational repression additionally requires the amino-terminal Q-rich stretch and the two first CSDs (first 397 aa), which constitute the translational effector domain.\",\n      \"method\": \"Gel-mobility shift assays with individual CSD domains, site-directed mutagenesis, tethering assays in cell-free translation systems\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — domain dissection with mutagenesis and multiple functional assays\",\n      \"pmids\": [\"18203923\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"The SXL-UNR corepressor complex inhibits ribosome recruitment to msl-2 mRNA via a PABP-dependent mechanism: UNR directly interacts with PABP, and the repressor complex acts after PABP-mediated recruitment of eIF4E/G to block ribosome binding.\",\n      \"method\": \"Direct biochemical assays for eIF4F and ribosome recruitment, co-IP of UNR with PABP, functional translation assays with poly(A) tail requirements\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — reconstituted biochemical assays with multiple orthogonal approaches; 62 citations\",\n      \"pmids\": [\"19941818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"NMR solution structures of all five CSDs of human UNR were determined; CSD1 has altered sidechain conformations in its RNP-1 and RNP-2 RNA-binding motifs (involving F43, H45, C46, Y30) compared to other CSDs, correlating with its 20-fold higher RNA-binding activity relative to CSD5.\",\n      \"method\": \"Solution NMR structure determination of all five CSDs\",\n      \"journal\": \"Journal of structural and functional genomics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct NMR structural determination with functional correlation\",\n      \"pmids\": [\"20213426\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"UNR/CSDE1 prevents differentiation of mouse embryonic stem cells into primitive endoderm by destabilizing Gata6 mRNAs; unr−/− ES cells spontaneously differentiate into PrE and re-expression of Unr reverses this phenotype.\",\n      \"method\": \"Knockout ES cell analysis, mRNA stability assays for Gata6, rescue by re-expression\",\n      \"journal\": \"Stem cells (Dayton, Ohio)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — KO with defined phenotype and molecular mechanism (mRNA destabilization); single lab\",\n      \"pmids\": [\"21954113\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"shRNA-mediated knockdown of Csde1 in mice causes failure of precerebellar neurons to complete both tangential and radial migration to their target regions in the hindbrain, establishing a required role for Csde1 in neuronal migration.\",\n      \"method\": \"shRNA knockdown in vivo (mouse), neuronal migration tracking\",\n      \"journal\": \"Neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — in vivo KD with defined cellular phenotype; single lab\",\n      \"pmids\": [\"24012837\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure (2.8 Å), NMR, and SAXS/SANS data of the ternary Sxl-Unr-msl2 mRNA complex reveal that the first CSD of Unr and two Sxl RRMs form intertwined interactions with RNA; cooperative complex formation increases RNA binding affinity ~1000-fold for the Unr CSD, and novel ternary RNA contacts including non-canonical contacts by the α1 helix of Sxl RRM1 are identified.\",\n      \"method\": \"X-ray crystallography (2.8 Å), NMR, SAXS, SANS\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — atomic-resolution crystal structure plus NMR and SAXS validation; 99 citations\",\n      \"pmids\": [\"25209665\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Drosophila UNR promotes targeting of the male-specific lethal (MSL) dosage-compensation complex to the X chromosome by facilitating the interaction between the RNA helicase MLE and the long non-coding RNA roX2.\",\n      \"method\": \"Co-immunoprecipitation, RNA-binding assays, functional dosage compensation assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP and functional data; single lab\",\n      \"pmids\": [\"25158899\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"UNR/CSDE1 stimulates translation in vitro through cold-shock domains 2 and 4, promotes binding of PABP1 to mRNA, and is required for the stable interaction of PABP1 and eIF4G in cells; siRNA knockdown of Unr reduces overall cellular translation and cap-dependent and IRES-dependent reporter translation.\",\n      \"method\": \"In vitro translation assays, CSD domain mutagenesis, co-IP of PABP1/eIF4G, siRNA knockdown with polysome/translation readouts\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution with mutagenesis plus cellular co-IP and KD phenotype\",\n      \"pmids\": [\"26936655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"UNR/CSDE1 promotes melanoma invasion and metastasis by post-transcriptionally regulating a pro-metastatic RNA regulon; it controls target mRNAs including VIM and RAC1 at the levels of RNA steady-state and translation elongation/termination, as revealed by iCLIP, RNA-seq, and ribosome profiling.\",\n      \"method\": \"iCLIP-seq, RNA-seq, ribosome profiling, loss- and gain-of-function experiments in melanoma cells and mouse models\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal genome-wide methods plus functional validation; 125 citations\",\n      \"pmids\": [\"27908735\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CSDE1/UNR is highly expressed in human embryonic stem cells and post-transcriptionally modulates core components of hESC identity and neurogenesis; it binds FABP7 and VIM mRNAs and regulates their stability and translation, and loss of CSDE1 accelerates neural differentiation while its ectopic expression impairs it.\",\n      \"method\": \"Loss- and gain-of-function (KO and OE), iCLIP, RNA-seq, ribosome profiling, RIP assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods with defined molecular targets; 60 citations\",\n      \"pmids\": [\"29129916\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"UNR/CSDE1 is required in vivo for the formation of nucleoplasmic reticulum (NR) structures in polyploid cells (trophoblast giant cells, hepatocytes); these Unr-NRs are sites of active mRNA translation containing poly(A) RNA and translation factors, and are absent in Unr-null cells.\",\n      \"method\": \"Electron microscopy, live imaging, immunofluorescence with translation factor markers, Unr-null mouse analysis\",\n      \"journal\": \"Journal of cell science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — localization with functional consequence (translation) and KO validation; single lab\",\n      \"pmids\": [\"28386023\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"CSDE1 directly interacts with BC200 lncRNA, and STRAP indirectly binds BC200 via heterodimerization with CSDE1; knockdown of BC200 causes redistribution of CSDE1 into nuclear foci, revealing a reciprocal regulatory relationship between CSDE1 and BC200.\",\n      \"method\": \"Mass spectrometry of BC200 RNP, co-IP, RNA truncation binding-site mapping, immunofluorescence after knockdown\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — MS identification confirmed by co-IP and functional localization data; single lab\",\n      \"pmids\": [\"30247708\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Csde1 binds mRNAs encoding proteins involved in protein homeostasis (ribogenesis, translation, protein degradation) in erythroid cells; deletion of CSD1 by CRISPR-Cas9 affects both mRNA and protein expression of Csde1-bound transcripts (e.g., enhanced Pabpc1 protein with reduced Pabpc1 mRNA, suggesting more efficient translation followed by feedback mRNA destabilization).\",\n      \"method\": \"RNA-IP, CRISPR-Cas9 CSD1 deletion, RNA-seq, proteomics\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — RIP, CRISPR, and multi-omics; single lab\",\n      \"pmids\": [\"29422612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"STRAP/UNRIP (the unr-interacting protein) is the most strongly associated protein with Csde1 in erythroblasts; Strap knockdown alters mRNA and/or protein expression of several Csde1-bound transcripts (Hmbs, eIF4g3, Pabpc4, Vim, Elavl1) without changing the pool of Csde1-bound transcripts.\",\n      \"method\": \"Co-IP/mass spectrometry, Strap knockdown, RNA-seq, proteomics\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP plus functional KD; single lab\",\n      \"pmids\": [\"30138317\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CSDE1 loss-of-function in mouse cortical neurons causes overgrowth of neurites, abnormal dendritic spine morphology, impaired synapse formation, and impaired synaptic transmission; HITS-CLIP shows Csde1-binding targets are enriched in autism-associated and FMRP target gene sets involved in neuronal development and synaptic plasticity.\",\n      \"method\": \"HITS-CLIP, Csde1 knockdown in primary mouse cortical neurons (morphology/synapse readouts), Drosophila mutant synapse assays\",\n      \"journal\": \"Science advances\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — HITS-CLIP, KD with defined cellular phenotype, cross-species validation; 37 citations\",\n      \"pmids\": [\"31579823\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CSDE1 interacts with AGO2 (the essential miRISC component) via target mRNAs, dependent on the first cold-shock domain (CSD1) of CSDE1; CSDE1 counters AGO2 binding to the 3'-UTR of PMEPA1, attenuating miR-129-5p/AGO2-mediated silencing of PMEPA1 and increasing PMEPA1 expression in melanoma.\",\n      \"method\": \"Co-IP of CSDE1 with AGO2, RNA-IP, competitive binding assays, CSD domain dependency experiments, functional reporter assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP, binding competition, domain mutagenesis, functional assays; multiple orthogonal methods\",\n      \"pmids\": [\"33833398\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"CSDE1 promotes STAT1 dephosphorylation by stabilizing T cell protein tyrosine phosphatase (TCPTP) mRNA/protein, thereby reducing tumor immunogenicity; SMYD3 mediates H3K4 trimethylation of the CSDE1 locus via mechanotransduction, linking epigenetic regulation to CSDE1-mediated immune evasion.\",\n      \"method\": \"RNA-seq, CSDE1 overexpression/knockdown, STAT1 phosphorylation assays, chromatin IP for H3K4me3 at CSDE1 locus, TCPTP binding assays\",\n      \"journal\": \"Science translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — multiple functional assays but mechanistic details require further validation; single study\",\n      \"pmids\": [\"36724242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"UNR/CSDE1 enables oncogene-induced senescence (OIS) in primary mouse keratinocytes by two independent mechanisms: (1) enhancing stability of SASP factor mRNAs and (2) repressing translation of Ybx1 mRNA; depletion of CSDE1 leads to senescence bypass, immortalization, and tumor formation (CSDE1 functions as a tumor suppressor in this context).\",\n      \"method\": \"CSDE1 depletion in primary keratinocytes, high-throughput transcriptomics and translatome profiling, mRNA stability and translation assays, in vivo tumor formation\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — unbiased high-throughput analyses plus functional validation with multiple orthogonal methods; 23 citations\",\n      \"pmids\": [\"35021076\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"The lncRNA ARHGAP5-AS1 stabilizes CSDE1 protein by attenuating interactions between CSDE1 and the E3 ubiquitin ligase TRIM28, preventing CSDE1 degradation via the ubiquitin-proteasome pathway; elevated CSDE1 promotes translation of VIM and RAC1 and activates the ERK pathway in HCC.\",\n      \"method\": \"Co-IP of CSDE1 with TRIM28, ubiquitination assays, lncRNA-protein interaction assays, functional cancer cell assays\",\n      \"journal\": \"Clinical and translational medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — co-IP identifying E3 ligase, ubiquitination assays, functional data; single lab\",\n      \"pmids\": [\"36354136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"UNR/CSDE1 interacts with HIV-1 Gag (via its NC domain) and NCp7 as confirmed by co-immunoprecipitation and FRET-FLIM; UNR acts as an ITAF increasing HIV-1 IRES-dependent translation, while NCp7 counteracts this stimulatory effect; Unr knockdown decreases infection by a non-replicative lentivector.\",\n      \"method\": \"Co-immunoprecipitation, FRET-FLIM, dual luciferase IRES assay, IRES point mutation analysis, siRNA knockdown\",\n      \"journal\": \"Viruses\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — co-IP confirmed by FRET-FLIM plus functional IRES assays; single lab\",\n      \"pmids\": [\"36016420\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"CSDE1 promotes biogenesis of miR-451 in erythroid cells by binding pre-miR-451 and regulating AGO2 processing through its N-terminal domains; CSDE1 further interacts with PARN and promotes trimming of intermediate miR-451 to mature length.\",\n      \"method\": \"RNA-IP, in vitro AGO2 processing assays, domain dependency studies, PARN interaction assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vitro processing assay plus domain-dependency experiments; single lab\",\n      \"pmids\": [\"37493604\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Csde1 binds ctnnb1 mRNAs (encoding β-catenin) and enhances their translation without altering mRNA stability in zebrafish embryos, thereby increasing β-catenin protein levels and Wnt/β-catenin signaling activity required for HSPC generation during embryonic development.\",\n      \"method\": \"Csde1 genetic mutants and morpholino knockdown in zebrafish, RIP assays for ctnnb1 mRNA, polysome profiling, mRNA stability assays\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — genetic mutants with RIP and translational control assays; single lab\",\n      \"pmids\": [\"37874038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"The Csde1-Strap complex binds Bach2 mRNA and couples its decay with translation to restrain the magnitude and duration of Bach2 protein expression during B-cell differentiation; in the absence of Csde1 or Strap, Bach2 translation is decoupled from mRNA decay, leading to elevated and prolonged Bach2 protein and impaired plasma cell differentiation.\",\n      \"method\": \"RNA interactome capture-coupled CRISPR/Cas9 functional screening, co-IP of Csde1-Strap complex, RIP for Bach2 mRNA, mRNA stability and translation assays in B cells\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — CRISPR screen plus co-IP, RIP, and mRNA decay/translation mechanistic assays; 2 citations but comprehensive\",\n      \"pmids\": [\"40133358\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CSDE1 is phosphorylated early during melanoma cellular transformation, and this phosphorylation correlates with changes in its subcellular localization and increased interactions with ribosomes; CSDE1 phosphorylation promotes ribosome association in melanoma cells compared to healthy melanocytes.\",\n      \"method\": \"Long-read Nanopore sequencing, 2D gel electrophoresis, interactome proteomics, phosphorylation site mapping, subcellular fractionation\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — extensive interactome and PTM analysis with localization data; single study\",\n      \"pmids\": [\"40883018\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CSDE1 directly binds the 3'-UTR of Cdk6 mRNA and maintains its stability, thereby sustaining Cdk6 levels required for the G1/S transition; Csde1 knockout in mouse cortex extends G1 phase duration in neural progenitors, causing impaired proliferation, abnormal cortical lamination, and embryonic lethality.\",\n      \"method\": \"Csde1 conditional KO in mouse cortex, CLIP-seq for 3'-UTR binding, Cdk6 mRNA stability assays, dual thymidine cell cycle labeling\",\n      \"journal\": \"Neuroscience bulletin\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — CLIP, KO phenotype, and molecular target validation; single study\",\n      \"pmids\": [\"40555862\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CSDE1 stabilizes AGO2 protein in mouse embryonic stem cells by preventing AGO2 ubiquitination; this stabilization is dependent on CSD1 (the first cold-shock domain), and CSDE1 also stabilizes pluripotency proteins NANOG, SOX2, and Oct4.\",\n      \"method\": \"CSDE1 KD/OE, ubiquitination assays for AGO2, CSD1 domain-dependency experiments, Western blotting for pluripotency markers\",\n      \"journal\": \"Frontiers in molecular biosciences\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — ubiquitination assays with domain dependency; single lab\",\n      \"pmids\": [\"41624769\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CSDE1 contributes to AGO2-mediated cleavage of the passenger strand miR-486-3p to facilitate miR-486-5p maturation; loss of CSDE1 increases miR-486-3p levels, decreases in vitro cleavage efficiency, and derepresses miR-486-5p targets; the function requires CSD1 for AGO2 interaction.\",\n      \"method\": \"In vitro AGO2 duplex cleavage assays, CSDE1 KO/rescue, miRNA quantification, CSD1 domain analysis\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 — in vitro reconstitution assay plus cellular KO and domain-dependency; single lab\",\n      \"pmids\": [\"41905768\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"MKRN2 E3 ubiquitin ligase directly ubiquitinates CSDE1 at four lysine residues (K81, K91, K208, K727); MKRN2 and CSDE1 form co-localized condensates via liquid-liquid phase separation, and disruption of either protein abolishes condensate formation; Mkrn2 KO mice show sex-specific social abnormalities consistent with ASD.\",\n      \"method\": \"Mass spectrometry identification of CSDE1 as MKRN2 substrate, mutagenesis of ubiquitination sites, LLPS assays, Mkrn2 KO mouse behavioral assays\",\n      \"journal\": \"Frontiers in cellular neuroscience\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS identification, mutagenesis, and LLPS assays; single lab, newly published\",\n      \"pmids\": [\"41757349\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"CSDE1 enhances genotoxic drug resistance by forming a ternary CSDE1-eIF3a-RPA2 mRNA complex that upregulates RPA2 expression and nucleotide excision repair/homologous recombination pathways; systemic CSDE1 KO in mice increases DNA damage in response to irradiation; CSDE1 inhibits the cGAS-STING pathway through RPA2.\",\n      \"method\": \"Biotin pull-down, EMSA, co-IP for ternary complex characterization, CSDE1 KO mouse models with DNA damage assays, cGAS-STING pathway analysis\",\n      \"journal\": \"Drug resistance updates\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — multiple biochemical assays plus in vivo KO model; single lab\",\n      \"pmids\": [\"40398074\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"UNR/CSDE1 interacts with the N-terminal segment of the ALL-1 (MLL) protein; two CSDs and two intervening polypeptides of UNR constitute the minimal region required for this interaction, confirmed by in vitro binding and co-immunoprecipitation from COS cells.\",\n      \"method\": \"Yeast two-hybrid screening, in vitro binding assays, co-immunoprecipitation\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 — two-hybrid plus in vitro binding and co-IP; single lab\",\n      \"pmids\": [\"8934551\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CSDE1/UNR is a multi-CSD cytoplasmic RNA-binding protein that post-transcriptionally regulates gene expression by modulating mRNA translation (both internal initiation and cap-dependent), mRNA stability, and miRNA biogenesis; it acts as an RNA chaperone at viral and cellular IRES elements (synergizing with PTB), couples mRNA deadenylation/decay to translation via interactions with PABP and CCR4, represses msl-2 translation through a SXL-UNR-PABP ternary mechanism, promotes miR-451 maturation and miR-486 passenger-strand cleavage via AGO2 interaction dependent on CSD1, is phosphorylated during melanoma transformation to drive ribosome association, and controls cell fate decisions in stem cells, neurons, B cells, and erythroid progenitors through coordinated post-transcriptional regulons.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"CSDE1 (UNR) is a cytoplasmic RNA-binding protein containing five cold-shock domains (CSDs) that functions as a master post-transcriptional regulator of mRNA translation, stability, and miRNA biogenesis across diverse cell types. It acts as an RNA chaperone at viral and cellular IRES elements—remodeling RNA structure cooperatively with PTB to expose ribosome landing sites—and stimulates cap-dependent translation by promoting PABP1–eIF4G interactions through CSD2 and CSD4 [PMID:12667457, PMID:26936655]. CSDE1 couples translation to mRNA decay via its interaction with PABP and the CCR4 deadenylase, thereby controlling the expression kinetics of target mRNAs including c-fos, Gata6, Bach2, VIM, and Cdk6 in contexts ranging from stem cell self-renewal and neuronal migration to B-cell differentiation and melanoma metastasis [PMID:15314026, PMID:27908735, PMID:40133358, PMID:40555862]. CSDE1 additionally participates in miRNA maturation by interacting with AGO2 through CSD1 to promote miR-451 processing and miR-486 passenger-strand cleavage, and in Drosophila it serves as a sex-specific translational corepressor of msl-2 mRNA in a ternary complex with SXL and PABP [PMID:37493604, PMID:41905768, PMID:25209665].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Establishing that UNR is a cytoplasmic single-stranded nucleic acid–binding protein resolved its basic biochemical identity and subcellular context.\",\n      \"evidence\": \"In vitro binding assays and subcellular fractionation/immunolocalization in mammalian cells\",\n      \"pmids\": [\"7518919\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological RNA targets unknown\", \"No functional role assigned\", \"Mechanism of cytoplasmic retention undefined\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Defining UNR's RNA-binding specificity (purine-rich AAGUA/G motif, ~10 nM Kd) and demonstrating that multiple CSDs cooperate for high-affinity binding established the modular logic of its RNA recognition.\",\n      \"evidence\": \"SELEX with recombinant UNR, domain dissection with truncated CSD constructs\",\n      \"pmids\": [\"10101203\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for multi-CSD cooperativity unknown\", \"In vivo target repertoire not mapped\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Identifying UNR as an IRES trans-acting factor (ITAF) that synergizes with PTB to drive HRV IRES-dependent translation, and discovering its partner UNRIP/STRAP, established its first functional role in translational control.\",\n      \"evidence\": \"RNA-affinity purification from HeLa extracts, co-IP, reconstitution in reticulocyte lysate translation assays\",\n      \"pmids\": [\"10049359\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of synergy with PTB unresolved\", \"Role of UNRIP/STRAP in IRES activity unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Demonstrating that UNR acts as an RNA chaperone on the Apaf-1 IRES—prebinding to remodel RNA structure and expose the ribosome landing site for PTB—provided a mechanistic framework for ITAF function beyond simple recruitment.\",\n      \"evidence\": \"RNA structural probing, binding-site mapping, and functional translation assays with ordered addition of UNR and PTB\",\n      \"pmids\": [\"12667457\", \"12610110\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Generalizability of ordered-chaperone model to other cellular IRESes untested\", \"No structural model at atomic resolution\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Linking UNR to mRNA decay via the c-fos mCRD showed that UNR couples translation to deadenylation through interactions with PABP and CCR4, establishing a translation-dependent mRNA destabilization mechanism.\",\n      \"evidence\": \"Co-IP of UNR with PABP and CCR4, functional mRNA decay assays with translation inhibitors\",\n      \"pmids\": [\"15314026\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct enzymatic role versus scaffolding function not distinguished\", \"Whether this mechanism generalizes beyond c-fos unclear\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identification of Drosophila UNR as a corepressor recruited by SXL to silence msl-2 translation revealed a sex-specific translational repression mechanism and expanded UNR's roles beyond IRES activation to include translational inhibition.\",\n      \"evidence\": \"mRNP purification with MS identification, co-IP, translational repression assays in Drosophila S2 cells\",\n      \"pmids\": [\"16452508\", \"16452509\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Human ortholog involvement in analogous repression unknown\", \"Mechanism of ribosome exclusion not yet defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Reconstituting the SXL-UNR-PABP ternary repression mechanism showed that the complex blocks 43S ribosome recruitment after eIF4F assembly, defining the step at which translational repression occurs.\",\n      \"evidence\": \"Biochemical assays measuring eIF4F and ribosome recruitment with purified components and poly(A)-dependent translation\",\n      \"pmids\": [\"19941818\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for ribosome exclusion at atomic level unknown\", \"Whether PABP interaction is required for all UNR-mediated repression unclear\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Solving NMR structures of all five human CSDs revealed that CSD1 has distinctive RNP motif conformations correlating with its superior RNA-binding affinity, providing a structural rationale for domain-specific functions.\",\n      \"evidence\": \"Solution NMR of all five isolated CSD domains\",\n      \"pmids\": [\"20213426\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length protein structure unavailable\", \"Inter-domain arrangements and RNA-bound conformations unresolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"The 2.8 Å crystal structure of the Sxl-Unr CSD1-msl2 RNA ternary complex revealed intertwined protein–RNA contacts and a ~1000-fold cooperative increase in Unr CSD1 RNA affinity, providing the first atomic-resolution view of UNR in a functional complex.\",\n      \"evidence\": \"X-ray crystallography, NMR, SAXS, and SANS of the ternary complex\",\n      \"pmids\": [\"25209665\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure includes only CSD1; multi-CSD architecture on RNA unknown\", \"Applicability to mammalian complexes not demonstrated structurally\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Showing that UNR-null ES cells spontaneously differentiate into primitive endoderm due to Gata6 mRNA stabilization established CSDE1 as a gatekeeper of stem cell fate through mRNA destabilization.\",\n      \"evidence\": \"Unr−/− ES cell analysis, Gata6 mRNA stability assays, rescue by re-expression\",\n      \"pmids\": [\"21954113\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Gata6 is a direct binding target or indirect effect not fully resolved\", \"Signaling pathways upstream of UNR in this context unknown\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Genome-wide iCLIP and ribosome profiling in melanoma revealed a CSDE1-regulated pro-metastatic RNA regulon (including VIM and RAC1), positioning CSDE1 as a post-transcriptional driver of cancer invasion.\",\n      \"evidence\": \"iCLIP-seq, RNA-seq, ribosome profiling, loss/gain-of-function in melanoma cells and mouse xenografts\",\n      \"pmids\": [\"27908735\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Regulatory logic distinguishing stabilization versus translational targets unclear\", \"Upstream signals activating CSDE1 in melanoma not identified\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Demonstrating that CSD2 and CSD4 stimulate cap-dependent translation and that CSDE1 stabilizes the PABP1–eIF4G interaction showed that CSDE1 functions as a general translation enhancer beyond IRES contexts.\",\n      \"evidence\": \"In vitro translation with CSD mutants, co-IP of PABP1/eIF4G, siRNA knockdown with polysome analysis\",\n      \"pmids\": [\"26936655\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this general stimulation is RNA target-selective in vivo unclear\", \"Mechanism of CSD2/CSD4 specificity not structurally resolved\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"CSDE1 was shown to regulate human embryonic stem cell identity and neurogenesis by binding and controlling FABP7 and VIM mRNA stability/translation, extending its stem cell role to human pluripotency.\",\n      \"evidence\": \"KO/OE in hESCs, iCLIP, RNA-seq, ribosome profiling\",\n      \"pmids\": [\"29129916\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How CSDE1 switches between mRNA stabilization and destabilization on different targets unclear\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"HITS-CLIP in neurons combined with functional knockdown showed that CSDE1 controls neurite outgrowth, dendritic spine morphology, and synapse formation, with targets enriched for autism-associated and FMRP target genes.\",\n      \"evidence\": \"HITS-CLIP in mouse cortical neurons, CSDE1 KD with morphological and electrophysiological readouts, cross-validated in Drosophila\",\n      \"pmids\": [\"31579823\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct causal link to autism spectrum disorder in humans not established genetically\", \"Which specific target mRNAs mediate synapse phenotype unknown\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"CSDE1 was found to enable oncogene-induced senescence by stabilizing SASP factor mRNAs and repressing Ybx1 translation, revealing a context-dependent tumor-suppressor function opposing its pro-metastatic role in melanoma.\",\n      \"evidence\": \"CSDE1 depletion in primary keratinocytes, transcriptome/translatome profiling, in vivo tumor formation assays\",\n      \"pmids\": [\"35021076\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How cell type determines whether CSDE1 acts as oncogene or tumor suppressor unresolved\", \"Post-translational modifications governing context-specificity not systematically mapped\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Demonstrating that CSDE1 promotes AGO2-dependent miR-451 maturation and PARN-mediated trimming expanded its functional repertoire to miRNA biogenesis, with CSD1-dependent AGO2 interaction as the critical determinant.\",\n      \"evidence\": \"RNA-IP, in vitro AGO2 processing assays, domain-dependency studies, PARN interaction assays in erythroid cells\",\n      \"pmids\": [\"37493604\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether CSDE1 affects biogenesis of miRNAs beyond miR-451 and miR-486 broadly untested\", \"Structural basis for CSD1-AGO2 interaction unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"The Csde1-Strap complex was shown to couple Bach2 mRNA decay with translation during B-cell differentiation, demonstrating that the translation–decay coupling mechanism originally described for c-fos operates in a physiological cell fate decision.\",\n      \"evidence\": \"RNA interactome capture-coupled CRISPR screen, co-IP of Csde1-Strap, RIP for Bach2 mRNA, mRNA stability and translation assays in B cells\",\n      \"pmids\": [\"40133358\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether Strap is required for all CSDE1-mediated decay coupling or only specific targets unknown\", \"Deadenylase identity in the B-cell context not confirmed\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"CSDE1 phosphorylation during melanoma transformation correlates with enhanced ribosome association, suggesting post-translational modification as a mechanism switching CSDE1 activity in cancer.\",\n      \"evidence\": \"2D gel electrophoresis, phosphorylation site mapping, interactome proteomics, subcellular fractionation comparing melanocytes and melanoma cells\",\n      \"pmids\": [\"40883018\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Kinase(s) responsible for CSDE1 phosphorylation not identified\", \"Causal relationship between phosphorylation and ribosome binding not demonstrated by mutagenesis\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"CSDE1 was found to stabilize Cdk6 mRNA via 3′-UTR binding to sustain G1/S progression in neural progenitors, with conditional KO causing extended G1, impaired proliferation, and cortical lamination defects.\",\n      \"evidence\": \"Conditional KO in mouse cortex, CLIP-seq for Cdk6 3′-UTR, mRNA stability assays, cell-cycle labeling\",\n      \"pmids\": [\"40555862\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Cdk6 is the sole essential target mediating the cortical phenotype not tested by epistasis\", \"Interaction with cell-cycle-dependent CSDE1 regulation (IRES at G2/M) not integrated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include: what determines whether CSDE1 stabilizes versus destabilizes a given mRNA target; what kinases phosphorylate CSDE1 and how this switches its activity; and what is the full-length multi-CSD architecture on RNA.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No full-length CSDE1 structure available\", \"Rules governing target-specific stabilization versus destabilization unknown\", \"Kinase-substrate relationships for CSDE1 phosphorylation not identified\", \"Systematic assessment of CSDE1 in miRNA biogenesis beyond miR-451/miR-486 lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 1, 6, 15]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [9, 10, 14, 20, 22]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [5, 28, 33, 39]},\n      {\"term_id\": \"GO:0044183\", \"supporting_discovery_ids\": [4, 12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 20, 36]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [36, 20]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0008953854\", \"supporting_discovery_ids\": [33, 39]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [2, 4, 20, 22]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [33, 39]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [17, 27, 37]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [21, 30]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [29]}\n    ],\n    \"complexes\": [\n      \"CSDE1-STRAP/UNRIP complex\",\n      \"SXL-UNR-PABP translational repression complex\"\n    ],\n    \"partners\": [\n      \"STRAP\",\n      \"PABPC1\",\n      \"PTB\",\n      \"AGO2\",\n      \"SXL\",\n      \"PARN\",\n      \"TRIM28\",\n      \"MKRN2\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}