{"gene":"ALYREF","run_date":"2026-06-09T22:02:43","timeline":{"discoveries":[{"year":2000,"finding":"ALY (ALYREF) is the metazoan homologue of yeast mRNA export factor Yra1p and is recruited to mRNP complexes in a splicing-dependent manner. ALY associates with spliced mRNPs but not with pre-assembled intronless mRNPs or hnRNP complexes, and shuttles between nucleus and cytoplasm. Excess recombinant ALY increases the rate and efficiency of mRNA export in vivo.","method":"Immunoprecipitation of spliced mRNPs, in vivo microinjection/export assays in Xenopus oocytes, nuclear-cytoplasmic shuttling assays","journal":"Nature","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal pulldowns, functional export assays in vivo, replicated across labs and foundational paper for the field","pmids":["11014198"],"is_preprint":false},{"year":2001,"finding":"The DEAD-box helicase UAP56 directly and specifically interacts with ALY/ALYREF and is present together with ALY in the spliced mRNP. Excess UAP56 acts as a dominant-negative inhibitor of mRNA export and blocks recruitment of ALY to the spliced mRNP. An ALY mutation that abolishes UAP56 interaction prevents ALY recruitment to spliced mRNP, demonstrating that UAP56 recruits ALY to couple splicing and export.","method":"Co-immunoprecipitation, in vitro binding assays, dominant-negative overexpression, mRNA export assays, ALY point mutant analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct binding demonstrated in vitro, functional epistasis confirmed by mutagenesis, replicated","pmids":["11675789"],"is_preprint":false},{"year":1997,"finding":"ALY (ALYREF) specifically associates with the activation domains of LEF-1 and AML-1 transcription factors, can increase DNA binding by both LEF-1 and AML proteins, and is required for TCRα enhancer activity. Overexpression of ALY stimulates TCRα enhancer activity in non-lymphoid cells; antisense depletion virtually eliminates TCRα enhancer activity in T cells.","method":"Yeast two-hybrid cloning, co-immunoprecipitation, overexpression and antisense knockdown in transfection assays, reporter gene assays","journal":"Genes & development","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and functional reporter assays in single lab with multiple orthogonal methods","pmids":["9119228"],"is_preprint":false},{"year":2002,"finding":"REF1/ALYREF and additional exon junction complex (EJC) proteins are dispensable for bulk mRNA export in Drosophila cells. Nuclear mRNA accumulation is only partially observed when REF1 and RNPS1 are co-depleted or all EJC proteins are simultaneously depleted, indicating that additional adaptor proteins mediate NXF1-mRNA interaction in metazoa independently of REF1.","method":"RNAi depletion in Drosophila S2 cells, fluorescence in situ hybridization for poly(A)+ RNA localization","journal":"The Journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean RNAi knockdown with defined export phenotype readout, single lab","pmids":["12438415"],"is_preprint":false},{"year":2007,"finding":"ALY/REF is preferentially associated with intronless mRNAs in the nucleus. UAP56 stimulates ALY/REF binding to intronless mRNA in vitro in an ATP-dependent manner. ATP activates RNA-binding activity of UAP56 itself; ATP-bound UAP56 contacts both RNA and ALY/REF simultaneously and cooperatively stimulates UAP56 ATPase activity, consistent with a chaperone model in which ATP-bound UAP56 loads ALY/REF onto RNA then dissociates upon ATP hydrolysis.","method":"RNA-binding assays in vitro, ATP hydrolysis assays, dominant-negative mutant (ATP-binding-deficient UAP56) export inhibition in Xenopus oocytes","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of ATP-dependent loading, mutagenesis validation, functional oocyte assay","pmids":["17984224"],"is_preprint":false},{"year":2008,"finding":"ALY/ALYREF is a physiological substrate of nuclear Akt kinase, which phosphorylates ALY at threonine-219. Nuclear PI3K/Akt signaling regulates ALY's subnuclear speckle residency, mRNA export activity, and cell proliferation. ALY also binds phosphoinositides; phosphoinositide binding (but not Akt phosphorylation) dictates nuclear speckle residency, while both phosphorylation and phosphoinositide binding are required for full mRNA export and proliferation functions.","method":"In vitro kinase assay, site-directed mutagenesis (T219 mutant), siRNA knockdown, mRNA export assays, cell proliferation assays, phosphoinositide-binding assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro kinase assay plus mutagenesis plus functional readout, single lab","pmids":["18562279"],"is_preprint":false},{"year":2009,"finding":"Aly/ALYREF and co-adaptor Thoc5 can simultaneously bind non-overlapping sites on the middle (Ntf2-like) domain of the nuclear export receptor Tap/NXF1. Nuclear export of HSP70 mRNA specifically depends on both Thoc5 and Aly. Thoc5 exhibits in vitro RNA-binding activity and associates with HSP70 mRNPs as part of the THO complex.","method":"Binding assays with recombinant proteins, RNAi knockdown, RNA immunoprecipitation, in vitro RNA-binding assay","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — recombinant protein binding assays plus functional RNAi phenotype, single lab","pmids":["19165146"],"is_preprint":false},{"year":2010,"finding":"Arginine methylation of REF/ALYREF (mapped by mass spectrometry) reduces its RNA-binding activity in vitro and in vivo without affecting the REF:TAP interaction. This reduced RNA-binding affinity in the methylated state is required for efficient displacement of RNA from REF by TAP/NXF1 in vivo, facilitating handover of mRNA to the export receptor.","method":"Mass spectrometry mapping of methylation sites, in vitro RNA-binding assays with methylated vs. unmethylated REF, in vivo RNA-binding assays, mRNA export assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mass spectrometry plus functional in vitro and in vivo assays, single lab","pmids":["20129943"],"is_preprint":false},{"year":2010,"finding":"ATP is strictly required for the interaction between UAP56 and both Aly/ALYREF and CIP29 during TREX complex assembly. Using recombinant proteins, UAP56 bridges an ATP-dependent trimeric complex with Aly and CIP29. UAP56 mediates ATP-dependent interaction between the THO complex and both Aly and CIP29.","method":"Proteomic analysis of immunopurified TREX, in vitro reconstitution of trimeric complex with recombinant proteins expressed in E. coli, ATP-dependence assays","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro reconstitution with purified recombinant proteins plus proteomics, rigorous ATP-dependence controls","pmids":["20844015"],"is_preprint":false},{"year":2012,"finding":"ALYREF directly interacts with THO subunits Thoc2 and Thoc5. Aly, THO, and UAP56 are all required for TREX assembly and for association of UAP56 with the spliced mRNA (but not pre-mRNA). Aly and THO require each other to associate with spliced mRNA. Both Aly and THO link UAP56 to the cap-binding protein CBP80.","method":"Systematic RNAi depletion, co-immunoprecipitation, spliced mRNA-association assays, mRNA export assays","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple RNAi conditions plus Co-IP, single lab with multiple orthogonal approaches","pmids":["23222130"],"is_preprint":false},{"year":2012,"finding":"REF/ALYREF can stabilize nuclear RNAs independently of promoting their export. Tethering REF/ALYREF to the KSHV PAN RNA increases its nuclear abundance and half-life but is insufficient to promote export. REF/ALYREF appears to protect the poly(A) tail from deadenylation, and REF-stabilized transcripts undergo further adenylation over time.","method":"Tethering assay (REF fused to MS2 coat protein), RNA half-life measurements, poly(A) tail length analysis, nuclear RNA abundance quantification","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — tethering assay with functional readout of RNA stability, single lab","pmids":["22290432"],"is_preprint":false},{"year":2016,"finding":"A short conserved WxHD motif in an unstructured region of ALYREF is required for RNA binding and for interaction with both eIF4A3 (EJC component) and CBP80 (cap-binding complex). Mutation of this motif impairs proper localization to nuclear speckles and reduces export of a spliced reporter mRNA, indicating this motif coordinates EJC- and cap-dependent assembly of export complexes on spliced mRNAs.","method":"Computational discovery of conserved motifs, in vitro splicing assays, site-directed mutagenesis, co-immunoprecipitation, nuclear speckle localization by fluorescence microscopy, spliced mRNA export reporter assay","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis validated by multiple functional readouts, single lab","pmids":["26773052"],"is_preprint":false},{"year":2017,"finding":"m5C modification in mRNAs is specifically recognized by ALYREF as an mRNA export adaptor, as demonstrated by in vitro binding assays and in vivo RNA immunoprecipitation. m5C formation is mainly catalyzed by NSUN2, and NSUN2 modulates ALYREF's nuclear-cytoplasmic shuttling and RNA-binding affinity. Depletion of NSUN2 reduces ALYREF-mediated mRNA export, which can be restored by wild-type but not methyltransferase-defective NSUN2, establishing ALYREF as an m5C reader that links RNA methylation to mRNA export.","method":"In vitro m5C RNA-binding assays, RNA immunoprecipitation (RIP), nuclear-cytoplasmic fractionation, mRNA export assays, NSUN2 reconstitution with methyltransferase-defective mutant, m5C-seq transcriptome profiling","journal":"Cell research","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro binding plus in vivo RIP plus functional rescue with mutagenesis, multiple orthogonal methods, widely cited and replicated","pmids":["28418038"],"is_preprint":false},{"year":2017,"finding":"hMTR4 (exosome cofactor) directly competes with ALYREF for binding to ARS2, a component of the cap-binding complex (CBC). This competition determines whether an RNA is degraded by the nuclear exosome or exported to the cytoplasm, establishing ALYREF's ARS2-binding as a critical checkpoint for nuclear RNA fate.","method":"Co-immunoprecipitation competition assays, RNAi knockdown, RNA-seq, nuclear RNA abundance measurements","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct competition demonstrated by Co-IP, functional consequence shown by knockdown, single lab","pmids":["28801509"],"is_preprint":false},{"year":2019,"finding":"ALYREF binds a region adjacent to the stem-loop (SL) structure on replication-dependent histone mRNAs. The SL-binding protein (SLBP) directly interacts with ALYREF and promotes its recruitment. ALYREF promotes histone pre-mRNA 3'-end processing by facilitating U7-snRNP recruitment through physical interaction with the U7-snRNP-specific component Lsm11, and together with other TREX components enhances histone mRNA nuclear export. 3'-end processing in turn promotes ALYREF recruitment.","method":"RNA immunoprecipitation, co-immunoprecipitation of ALYREF-SLBP and ALYREF-Lsm11 interactions, 3'-end processing assays, mRNA export assays, RNAi knockdown","journal":"The EMBO journal","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus functional processing and export assays, single lab with multiple methods","pmids":["30858280"],"is_preprint":false},{"year":2021,"finding":"ALYREF forms a nuclear coactivator complex with MYCN that stimulates transcription of USP3. Increased USP3 levels reduce K-48- and K-63-linked ubiquitination of MYCN, stabilizing MYCN protein. ALYREF is required for MYCN-driven effects on the malignant phenotype and for USP3's effect on MYCN stability, defining an ALYREF-MYCN-USP3 axis in neuroblastoma.","method":"Co-immunoprecipitation of ALYREF-MYCN complex, ChIP/transcription assays for USP3, ubiquitination assays, transgenic neuroblastoma models in vitro and in vivo, RNAi knockdown","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP plus functional ubiquitination assays plus in vivo model, single lab","pmids":["33767157"],"is_preprint":false},{"year":2021,"finding":"ALYREF stabilizes PKM2 mRNA by binding to m5C sites in the 3'-UTR of PKM2 mRNA (demonstrated by RNA immunoprecipitation and RIP-seq). Overexpression of ALYREF promotes bladder cancer cell proliferation via PKM2-mediated glycolysis. HIF-1α indirectly upregulates PKM2 expression by transcriptionally activating ALYREF.","method":"RNA immunoprecipitation (RIP), RNA-seq, dual-luciferase reporter assays, Western blotting, in vitro and in vivo cancer cell assays","journal":"Cancer communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq for direct binding plus functional assays, single lab","pmids":["33991457"],"is_preprint":false},{"year":2021,"finding":"ALYREF drives glioblastoma cell proliferation via stabilization of MYC mRNA (demonstrated by CLIP assay) and activation of Wnt/β-catenin signaling. MYC transcriptionally regulates ALYREF expression (by ChIP assay), creating a positive feedback loop. ALYREF depletion reduces GBM tumor formation in vivo.","method":"ChIP assay, CLIP assay, RNA stability assays, siRNA knockdown, in vitro proliferation and in vivo tumor formation assays","journal":"OncoTargets and therapy","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, CLIP and ChIP without deep mutagenesis validation","pmids":["33447056"],"is_preprint":false},{"year":2022,"finding":"ALYREF binds to the NEAT1 promoter region to enhance global NEAT1 transcriptional activity, and also stabilizes CPSF6 (a protein that selectively promotes the short NEAT1 isoform) and directly binds and stabilizes the short NEAT1 isoform. This selectively fine-tunes the short NEAT1 isoform expression in breast cancer.","method":"ChIP assay for ALYREF at NEAT1 promoter, RNA-binding/stability assays, CPSF6 protein level measurement upon ALYREF knockdown, transcriptional profiling, orthotopic mouse model","journal":"Cellular and molecular life sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, limited orthogonal validation of direct binding mechanism","pmids":["35776213"],"is_preprint":false},{"year":2023,"finding":"ALYREF specifically binds hypermethylated m5C sites in RABL6 and TK1 mRNA via its K171 domain and controls UCB malignancy by promoting hypermethylated RABL6 and TK1 mRNA splicing and stabilization. ALYREF also recognizes hypermethylated m5C sites in NSUN2 mRNA, resulting in NSUN2 upregulation and creating a cross-regulatory loop between the m5C writer and reader.","method":"RNA bisulfite sequencing (BisSeq), RNA-seq, RIP-seq, patient-derived organoids, orthotopic xenograft models, domain mutagenesis (K171)","journal":"Cell death & disease","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multi-omic integration plus domain mutagenesis and functional models, single lab","pmids":["36806253"],"is_preprint":false},{"year":2024,"finding":"ALYREF directly binds m5C modification sites in the 3'-UTR of EGFR mRNA, stabilizing EGFR mRNA and consequently activating the STAT3 signaling pathway in hepatocellular carcinoma cells.","method":"RNA immunoprecipitation (RIP), RNA stability assays, m5C site identification, in vitro and in vivo functional assays","journal":"International journal of biological sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, RIP-based binding evidence without deep mutagenesis of m5C sites","pmids":["38164181"],"is_preprint":false},{"year":2024,"finding":"ALYREF recognizes m5C sites in JunD mRNA, maintaining JunD mRNA stability and upregulating SLC7A5 transcription, which depletes amino acids in the tumor microenvironment and restricts CD8+ T cell function in pancreatic ductal adenocarcinoma.","method":"RNA immunoprecipitation, RNA stability assays, in vivo tumor growth assays, immune cell function assays, tissue microarray","journal":"Cell death discovery","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, RIP-based binding, functional cascade only partially validated mechanistically","pmids":["38402198"],"is_preprint":false},{"year":2024,"finding":"ALYREF forms a complex with ELAVL1 (HuR) to cooperatively promote m5C recognition and nuclear export of RPS6KB2 and RPTOR mRNAs in colorectal cancer cells. E2F6 transcriptionally activates ALYREF expression.","method":"RIP-Bis-seq, RNA-seq, Co-immunoprecipitation of ALYREF-ELAVL1 complex, RNA export assays, ChIP for E2F6 at ALYREF promoter","journal":"NPJ precision oncology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, Co-IP plus RIP without reconstitution or mutagenesis","pmids":["39455812"],"is_preprint":false},{"year":2019,"finding":"Drosophila Ref1 (orthologue of human ALYREF) genetically interacts with TDP-43 and C9orf72 GGGGCC repeat expansion: Ref1 downregulation mitigates toxicity from both disease proteins by lowering their mRNA and protein levels. Expression of TDP-43 or GGGGCC repeats increases endogenous Ref1 mRNA levels. Human ALYREF protein is upregulated by immunohistochemistry in ALS motor neurons.","method":"Drosophila genetic screen, RNAi knockdown, mRNA/protein level quantification, immunohistochemistry of human ALS tissue","journal":"Acta neuropathologica communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — genetic epistasis in Drosophila plus IHC, no direct biochemical mechanism established","pmids":["31036086"],"is_preprint":false},{"year":2024,"finding":"ALYREF promotes NPC metastasis by binding m5C-modified NOTCH1 mRNA, enhancing NOTCH1 mRNA stability in an m5C modification-dependent manner, thereby activating the NOTCH signaling pathway.","method":"RNA immunoprecipitation, RNA stability assays, m5C sequencing, in vitro invasion/migration assays, in vivo metastasis model","journal":"Cell death & disease","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, RIP-based binding without mutagenesis of binding interface","pmids":["39117671"],"is_preprint":false},{"year":2020,"finding":"ALYREF, as an m5C reader protein, plays an important role in regulating murine leukemia virus (MLV) replication. m5C is highly enriched in viral genomic RNA relative to cellular mRNAs, and ALYREF knockdown reduces viral production.","method":"Mass spectrometry, m5C sequencing at single-nucleotide resolution, siRNA knockdown of ALYREF, viral titer assays","journal":"Journal of virology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, functional knockdown phenotype without direct binding mechanism characterization","pmids":["32321818"],"is_preprint":false},{"year":2002,"finding":"HSV-1 ICP27 interacts with ALY/REF in infected mammalian cells and recruits ALY/REF from spliceosomes to viral transcription sites. This interaction directs viral intronless mRNAs to the TAP/NXF1 export pathway. ICP27 interacts directly with TAP/NXF1 independently of ALY/REF bridging, and this TAP/NXF1 interaction (not the ALY/REF interaction) is required for ICP27 nuclear export.","method":"Co-immunoprecipitation, UV cross-linking, dominant-negative TAP export assay, LMB sensitivity assay, immunofluorescence colocalization","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple methods including dominant-negative assay and Co-IP, single lab","pmids":["12438613"],"is_preprint":false},{"year":2014,"finding":"NMR structure of the HVS ORF57-ALYREF interface was determined at atomic resolution. An α-helix in ORF57 competitively displaces viral RNA from ORF57 when ALYREF is present, while the flexible N-terminal domain of ALYREF engages the viral RNA, creating a ternary ALYREF-ORF57-RNA complex. UV cross-linking and mutagenesis confirmed individual ORF57 residues involved in RNA recognition and the RNA-transfer mechanism.","method":"NMR structure determination of ORF57-ALYREF interface, UV cross-linking, site-directed mutagenesis, RNA-binding competition assays","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 1 / Moderate — atomic-resolution NMR structure plus mutagenesis plus UV cross-linking in single rigorous study","pmids":["24550725"],"is_preprint":false},{"year":2022,"finding":"m5C modification of YBX2 and SMO mRNAs is recognized by ALYREF, which exports these mRNAs to the cytoplasm, increasing YBX2 and SMO protein levels. This mechanism inhibits adipogenesis and promotes myogenesis respectively via ALYREF-m5C-YBX2 and ALYREF-m5C-SMO axes.","method":"RNA bisulfite sequencing, RNA immunoprecipitation, nuclear-cytoplasmic fractionation, RNA export assays, in vitro adipogenesis/myogenesis differentiation assays","journal":"Cellular and molecular life sciences","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, RIP-based evidence without mutagenesis of m5C sites or ALYREF binding domain","pmids":["35962235"],"is_preprint":false}],"current_model":"ALYREF (ALY/REF) is an mRNA export adaptor protein that is recruited to spliced mRNPs by the DEAD-box helicase UAP56 in an ATP-dependent manner, where it links the exon junction complex (via eIF4A3) and the cap-binding complex (via CBP80/ARS2) to the TAP/NXF1 nuclear export receptor; ALYREF also functions as a specific reader of m5C-modified mRNAs through recognition of 5-methylcytosine marks deposited by NSUN2, thereby coupling epitranscriptomic modification to selective mRNA nuclear export, and can additionally stabilize nuclear RNAs independently of export, participate as a transcriptional coactivator (e.g., with LEF-1/AML-1 at the TCRα enhancer and with MYCN at the USP3 promoter), and undergo regulatory post-translational modifications including Akt-mediated phosphorylation at Thr-219 and arginine methylation that fine-tunes RNA handover to TAP/NXF1."},"narrative":{"mechanistic_narrative":"ALYREF (ALY/REF) is the metazoan mRNA export adaptor that couples nuclear mRNP maturation to nuclear export, recruited to spliced mRNPs in a splicing-dependent manner and capable of accelerating bulk mRNA export in vivo [PMID:11014198]. Its loading onto RNA is driven by the DEAD-box helicase UAP56, which directly binds ALYREF and, in an ATP-dependent reaction, deposits it onto RNA before dissociating upon ATP hydrolysis—a chaperone-style handoff that also operates on intronless mRNAs [PMID:11675789, PMID:17984224, PMID:20844015]. Within the TREX complex, ALYREF contacts THO subunits THOC2 and THOC5 and bridges UAP56 to the cap-binding protein CBP80, while a short conserved WxHD motif in an unstructured region coordinates simultaneous engagement of the exon junction complex (via eIF4A3) and the cap-binding complex on spliced mRNAs and directs nuclear speckle localization [PMID:23222130, PMID:26773052]. ALYREF and the co-adaptor THOC5 occupy non-overlapping sites on the NTF2-like domain of the export receptor TAP/NXF1, and arginine methylation lowers ALYREF's RNA affinity to enable handover of the transcript to TAP/NXF1 [PMID:19165146, PMID:20129943]. ALYREF additionally functions as a reader of 5-methylcytosine (m5C)-modified mRNA: it recognizes m5C marks deposited by NSUN2 and couples this epitranscriptomic modification to selective mRNA export [PMID:28418038]. Its binding to ARS2 within the cap-binding complex constitutes an export-versus-degradation checkpoint, competing with the exosome cofactor hMTR4 to determine nuclear RNA fate [PMID:28801509]. Beyond export, ALYREF can stabilize nuclear RNAs independently of export by protecting the poly(A) tail [PMID:22290432], promote histone pre-mRNA 3'-end processing through SLBP- and Lsm11-dependent U7-snRNP recruitment [PMID:30858280], and act as a transcriptional coactivator with LEF-1/AML-1 at the TCRα enhancer [PMID:9119228] and with MYCN at the USP3 promoter [PMID:33767157]. ALYREF activity is regulated by nuclear Akt-mediated phosphorylation at Thr-219 and by phosphoinositide binding, which together control speckle residency and export function [PMID:18562279]. In disease contexts, ALYREF stabilizes oncogenic m5C-marked transcripts in multiple cancers [PMID:33991457, PMID:36806253], and viral proteins including HSV-1 ICP27 and HVS ORF57 hijack ALYREF to route intronless viral RNAs into the TAP/NXF1 export pathway [PMID:12438613, PMID:24550725].","teleology":[{"year":1997,"claim":"Before its export role was known, ALYREF was identified as a transcriptional coactivator, establishing an early and distinct nuclear function in gene activation.","evidence":"Yeast two-hybrid, Co-IP, and reporter assays linking ALY to LEF-1/AML-1 activation domains and TCRα enhancer activity","pmids":["9119228"],"confidence":"Medium","gaps":["Does not establish whether coactivation is separable from RNA-handling functions","No structural basis for activation-domain recognition"]},{"year":2000,"claim":"Established ALYREF as a splicing-dependent mRNP component and bona fide mRNA export factor, defining its core cellular role.","evidence":"IP of spliced mRNPs, in vivo Xenopus oocyte export assays, shuttling assays","pmids":["11014198"],"confidence":"High","gaps":["Mechanism of recruitment to mRNP not yet defined","Did not identify the export receptor it hands RNA to"]},{"year":2001,"claim":"Answered how ALYREF is recruited to spliced mRNPs by showing UAP56 directly binds and loads it, coupling splicing to export.","evidence":"Co-IP, in vitro binding, dominant-negative overexpression, ALY point-mutant rescue, export assays","pmids":["11675789"],"confidence":"High","gaps":["Energetics of the loading reaction not yet resolved","Did not address intronless mRNA recruitment"]},{"year":2002,"claim":"Defined the limits of ALYREF's export role by showing EJC/REF1 is dispensable for bulk export in Drosophila, implying redundant adaptors.","evidence":"RNAi depletion in S2 cells with poly(A)+ FISH readout","pmids":["12438415"],"confidence":"Medium","gaps":["Identity of redundant adaptors not established","Species-specific differences from mammals unresolved"]},{"year":2002,"claim":"Showed viral exploitation of ALYREF, with HSV-1 ICP27 relocating it to route intronless viral mRNAs into the TAP/NXF1 pathway.","evidence":"Co-IP, UV cross-linking, dominant-negative TAP and LMB assays, colocalization","pmids":["12438613"],"confidence":"Medium","gaps":["ICP27 export shown to be ALYREF-independent, leaving ALYREF's necessity for viral RNA export unclear","No structural detail of the interaction"]},{"year":2007,"claim":"Resolved the biochemical logic of RNA loading: ATP-bound UAP56 contacts both RNA and ALYREF and chaperones loading onto intronless mRNA.","evidence":"In vitro RNA-binding and ATP hydrolysis assays, ATP-binding-deficient UAP56 mutant in oocytes","pmids":["17984224"],"confidence":"High","gaps":["Stoichiometry on native mRNPs not defined","Selectivity for specific transcripts unaddressed"]},{"year":2008,"claim":"Identified post-translational regulation, showing nuclear Akt phosphorylates ALYREF at Thr-219 and that phosphoinositide binding controls speckle residency and export.","evidence":"In vitro kinase assay, T219 mutagenesis, siRNA, export and proliferation assays, phosphoinositide binding","pmids":["18562279"],"confidence":"Medium","gaps":["Physiological signals upstream of nuclear Akt toward ALYREF unclear","Single lab; phosphoinositide-binding interface not mapped"]},{"year":2009,"claim":"Mapped the ALYREF–NXF1 handoff geometry, showing ALYREF and THOC5 bind non-overlapping sites on the NXF1 NTF2-like domain.","evidence":"Recombinant protein binding, RNAi, RNA-IP, in vitro RNA binding","pmids":["19165146"],"confidence":"Medium","gaps":["Transcript selectivity beyond HSP70 not generalized","Order of binding events on NXF1 unresolved"]},{"year":2010,"claim":"Reconstituted ATP-dependent TREX assembly, showing UAP56 bridges a trimeric complex with ALYREF and CIP29 and links THO to both.","evidence":"Proteomics of immunopurified TREX, in vitro reconstitution with recombinant proteins, ATP-dependence assays","pmids":["20844015"],"confidence":"High","gaps":["Dynamics of complex disassembly during export unresolved","Spatial coupling to spliceosome not reconstituted"]},{"year":2010,"claim":"Explained the RNA-to-receptor handover, showing arginine methylation lowers ALYREF RNA affinity to allow TAP/NXF1 to displace it from mRNA.","evidence":"MS mapping of methylation sites, in vitro/in vivo RNA-binding and export assays","pmids":["20129943"],"confidence":"Medium","gaps":["Methyltransferase responsible not identified here","Regulation of methylation timing unknown"]},{"year":2012,"claim":"Detailed TREX architecture by showing ALYREF directly binds THOC2/THOC5 and that ALY and THO mutually require each other and link UAP56 to CBP80.","evidence":"Systematic RNAi, Co-IP, spliced-mRNA association and export assays","pmids":["23222130"],"confidence":"Medium","gaps":["Direct vs. indirect CBP80 contact not distinguished here","Single lab"]},{"year":2012,"claim":"Uncovered an export-independent function, showing ALYREF can stabilize nuclear RNA by protecting the poly(A) tail.","evidence":"MS2 tethering to KSHV PAN RNA, half-life and poly(A) tail measurements","pmids":["22290432"],"confidence":"Medium","gaps":["Mechanism of poly(A) protection not biochemically defined","Generality to cellular RNAs untested"]},{"year":2014,"claim":"Provided atomic-resolution insight into viral RNA hijacking, defining how HVS ORF57 transfers viral RNA to ALYREF in a ternary complex.","evidence":"NMR structure of the ORF57-ALYREF interface, UV cross-linking, mutagenesis, competition assays","pmids":["24550725"],"confidence":"High","gaps":["Cellular RNA-recognition mode of ALYREF N-terminus not structurally generalized","Does not address full mRNP context"]},{"year":2016,"claim":"Identified the WxHD motif as the structural hub coordinating EJC (eIF4A3) and cap (CBP80) engagement during export-complex assembly on spliced mRNAs.","evidence":"Conserved-motif analysis, in vitro splicing, mutagenesis, Co-IP, speckle localization, export reporter","pmids":["26773052"],"confidence":"Medium","gaps":["How a single short motif achieves multiple contacts unresolved","Structural model of assembled complex absent"]},{"year":2017,"claim":"Defined ALYREF as an m5C reader, coupling NSUN2-deposited methylation to selective mRNA export — a major expansion of its mechanism.","evidence":"In vitro m5C binding, RIP, fractionation, export assays, NSUN2 methyltransferase-dead rescue, m5C-seq","pmids":["28418038"],"confidence":"High","gaps":["Structural basis of m5C recognition not defined","Fraction of cellular export that is m5C-dependent unquantified"]},{"year":2017,"claim":"Positioned ALYREF at an export-versus-degradation decision point by showing hMTR4 competes with it for ARS2 binding.","evidence":"Co-IP competition assays, RNAi, RNA-seq, nuclear RNA quantification","pmids":["28801509"],"confidence":"Medium","gaps":["What biases the competition for individual transcripts unknown","Single lab"]},{"year":2019,"claim":"Extended ALYREF's role to histone mRNA biogenesis, linking it to SLBP- and Lsm11-dependent 3'-end processing as well as export.","evidence":"RIP, reciprocal Co-IP, 3'-end processing and export assays, RNAi","pmids":["30858280"],"confidence":"Medium","gaps":["Mechanistic order of processing vs. recruitment only partly resolved","Single lab"]},{"year":2021,"claim":"Connected ALYREF to oncogenic gene regulation, including m5C-dependent stabilization of PKM2 mRNA and coactivation of MYCN at the USP3 promoter.","evidence":"RIP/RIP-seq, ChIP and ubiquitination assays, luciferase reporters, in vitro and in vivo cancer models","pmids":["33991457","33767157"],"confidence":"Medium","gaps":["Whether export vs. stabilization drives the oncogenic effect not fully separated","Single-lab cancer-context studies"]},{"year":2023,"claim":"Mapped a domain (K171) required for hypermethylated-m5C recognition and showed ALYREF can promote splicing and stabilization of target transcripts including a writer-reader loop with NSUN2 mRNA.","evidence":"RNA BisSeq, RNA-seq, RIP-seq, K171 domain mutagenesis, organoid and xenograft models","pmids":["36806253"],"confidence":"Medium","gaps":["Structural definition of the K171 m5C-binding pocket absent","Generality of the NSUN2 feedback loop untested"]},{"year":2024,"claim":"Multiple cancer studies extended the m5C-reader model to additional transcripts and cooperating factors (e.g., ELAVL1), establishing recurrent oncogenic ALYREF-m5C axes.","evidence":"RIP/RIP-Bis-seq, RNA stability/export assays, Co-IP, in vivo tumor models across HCC, PDAC, CRC and NPC","pmids":["38164181","38402198","39455812","39117671"],"confidence":"Low","gaps":["Largely RIP-based binding without mutagenesis of m5C sites or ALYREF interface","Single-lab, context-specific; mechanistic cascades only partly validated"]},{"year":null,"claim":"How ALYREF's distinct activities — TREX-mediated bulk export, m5C-reader selectivity, transcriptional coactivation, RNA stabilization, and histone-processing — are partitioned and regulated within a single nucleus remains unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No structural model integrating m5C recognition with the TREX export interface","Rules governing transcript-specific m5C-dependent versus splicing-dependent recruitment unknown","Mechanistic separation of export-coupled vs. export-independent (stabilization, transcription) roles incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,4,7,11,12]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[0,1,6,11]},{"term_id":"GO:0140110","term_label":"transcription regulator activity","supporting_discovery_ids":[2,15]},{"term_id":"GO:0140299","term_label":"molecular sensor activity","supporting_discovery_ids":[12]}],"localization":[{"term_id":"GO:0005654","term_label":"nucleoplasm","supporting_discovery_ids":[0,5,11]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[0,10]},{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,12]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[0,1,8,12]},{"term_id":"R-HSA-74160","term_label":"Gene expression (Transcription)","supporting_discovery_ids":[2,15,18]},{"term_id":"R-HSA-9609507","term_label":"Protein localization","supporting_discovery_ids":[0,6,12]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[15,16,19]}],"complexes":["TREX complex","THO complex"],"partners":["UAP56","THOC2","THOC5","NXF1","EIF4A3","CBP80","NSUN2","ELAVL1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q86V81","full_name":"THO complex subunit 4","aliases":["Ally of AML-1 and LEF-1","Aly/REF export factor","Transcriptional coactivator Aly/REF","bZIP-enhancing factor BEF"],"length_aa":257,"mass_kda":26.9,"function":"Functions as an mRNA export adapter; component of the transcription/export (TREX) complex which is thought to couple mRNA transcription, processing and nuclear export, and specifically associates with spliced mRNA and not with unspliced pre-mRNA (PubMed:15833825, PubMed:15998806, PubMed:17190602). TREX is recruited to spliced mRNAs by a transcription-independent mechanism, binds to mRNA upstream of the exon-junction complex (EJC) and is recruited in a splicing- and cap-dependent manner to a region near the 5' end of the mRNA where it functions in mRNA export to the cytoplasm via the TAP/NXF1 pathway (PubMed:15833825, PubMed:15998806, PubMed:17190602). Involved in the nuclear export of intronless mRNA; proposed to be recruited to intronless mRNA by ATP-bound DDX39B (PubMed:17984224). Plays a key role in mRNP recognition and mRNA packaging by bridging the mRNP-bound EJC and the TREX core complex (PubMed:37020021). TREX recruitment occurs via an interaction between ALYREF/THOC4 and the cap-binding protein NCBP1 (PubMed:15833825, PubMed:15998806, PubMed:17190602, PubMed:37020021). Required for TREX complex assembly and for linking DDX39B to the cap-binding complex (CBC) (PubMed:15998806, PubMed:17984224, PubMed:37020021). Binds mRNA which is thought to be transferred to the NXF1-NXT1 heterodimer for export (TAP/NXF1 pathway) (PubMed:11675789, PubMed:11707413, PubMed:11979277, PubMed:15833825, PubMed:15998806, PubMed:17190602, PubMed:18364396, PubMed:22144908, PubMed:22893130, PubMed:23222130, PubMed:25662211). In conjunction with THOC5 functions in NXF1-NXT1 mediated nuclear export of HSP70 mRNA; both proteins enhance the RNA binding activity of NXF1 and are required for NXF1 localization to the nuclear rim (PubMed:19165146). Involved in mRNA export of C5-methylcytosine (m5C)-containing mRNAs: specifically recognizes and binds m5C mRNAs and mediates their nucleo-cytoplasmic shuttling (PubMed:28418038). Acts as a chaperone and promotes the dimerization of transcription factors containing basic leucine zipper (bZIP) domains and thereby promotes transcriptional activation (PubMed:10488337). Involved in transcription elongation and genome stability (PubMed:12438613) (Microbial infection) The TREX complex is essential for the export of Kaposi's sarcoma-associated herpesvirus (KSHV) intronless mRNAs and infectious virus production; ALYREF/THOC4 mediates the recruitment of the TREX complex to the intronless viral mRNA","subcellular_location":"Nucleus; Nucleus speckle; Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q86V81/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":true,"resolved_as":"","url":"https://depmap.org/portal/gene/ALYREF","classification":"Common 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FYTTD1","url":"https://www.omim.org/entry/616933"},{"mim_id":"604171","title":"ALY/REF EXPORT FACTOR; ALYREF","url":"https://www.omim.org/entry/604171"},{"mim_id":"300199","title":"RNA-BINDING MOTIF PROTEIN, X CHROMOSOME; RBMX","url":"https://www.omim.org/entry/300199"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Nucleoplasm","reliability":"Approved"},{"location":"Nuclear speckles","reliability":"Approved"}],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in all","driving_tissues":[{"tissue":"bone marrow","ntpm":140.5}],"url":"https://www.proteinatlas.org/search/ALYREF"},"hgnc":{"alias_symbol":["ALY","BEF","ALY/REF","REF"],"prev_symbol":["THOC4"]},"alphafold":{"accession":"Q86V81","domains":[{"cath_id":"3.30.70.330","chopping":"107-182","consensus_level":"high","plddt":91.5701,"start":107,"end":182}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86V81","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q86V81-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q86V81-F1-predicted_aligned_error_v6.png","plddt_mean":64.12},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=ALYREF","jax_strain_url":"https://www.jax.org/strain/search?query=ALYREF"},"sequence":{"accession":"Q86V81","fasta_url":"https://rest.uniprot.org/uniprotkb/Q86V81.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q86V81/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q86V81"}},"corpus_meta":[{"pmid":"28418038","id":"PMC_28418038","title":"5-methylcytosine 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ALY associates with spliced mRNPs but not with pre-assembled intronless mRNPs or hnRNP complexes, and shuttles between nucleus and cytoplasm. Excess recombinant ALY increases the rate and efficiency of mRNA export in vivo.\",\n      \"method\": \"Immunoprecipitation of spliced mRNPs, in vivo microinjection/export assays in Xenopus oocytes, nuclear-cytoplasmic shuttling assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal pulldowns, functional export assays in vivo, replicated across labs and foundational paper for the field\",\n      \"pmids\": [\"11014198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"The DEAD-box helicase UAP56 directly and specifically interacts with ALY/ALYREF and is present together with ALY in the spliced mRNP. Excess UAP56 acts as a dominant-negative inhibitor of mRNA export and blocks recruitment of ALY to the spliced mRNP. An ALY mutation that abolishes UAP56 interaction prevents ALY recruitment to spliced mRNP, demonstrating that UAP56 recruits ALY to couple splicing and export.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assays, dominant-negative overexpression, mRNA export assays, ALY point mutant analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct binding demonstrated in vitro, functional epistasis confirmed by mutagenesis, replicated\",\n      \"pmids\": [\"11675789\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"ALY (ALYREF) specifically associates with the activation domains of LEF-1 and AML-1 transcription factors, can increase DNA binding by both LEF-1 and AML proteins, and is required for TCRα enhancer activity. Overexpression of ALY stimulates TCRα enhancer activity in non-lymphoid cells; antisense depletion virtually eliminates TCRα enhancer activity in T cells.\",\n      \"method\": \"Yeast two-hybrid cloning, co-immunoprecipitation, overexpression and antisense knockdown in transfection assays, reporter gene assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and functional reporter assays in single lab with multiple orthogonal methods\",\n      \"pmids\": [\"9119228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"REF1/ALYREF and additional exon junction complex (EJC) proteins are dispensable for bulk mRNA export in Drosophila cells. Nuclear mRNA accumulation is only partially observed when REF1 and RNPS1 are co-depleted or all EJC proteins are simultaneously depleted, indicating that additional adaptor proteins mediate NXF1-mRNA interaction in metazoa independently of REF1.\",\n      \"method\": \"RNAi depletion in Drosophila S2 cells, fluorescence in situ hybridization for poly(A)+ RNA localization\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean RNAi knockdown with defined export phenotype readout, single lab\",\n      \"pmids\": [\"12438415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"ALY/REF is preferentially associated with intronless mRNAs in the nucleus. UAP56 stimulates ALY/REF binding to intronless mRNA in vitro in an ATP-dependent manner. ATP activates RNA-binding activity of UAP56 itself; ATP-bound UAP56 contacts both RNA and ALY/REF simultaneously and cooperatively stimulates UAP56 ATPase activity, consistent with a chaperone model in which ATP-bound UAP56 loads ALY/REF onto RNA then dissociates upon ATP hydrolysis.\",\n      \"method\": \"RNA-binding assays in vitro, ATP hydrolysis assays, dominant-negative mutant (ATP-binding-deficient UAP56) export inhibition in Xenopus oocytes\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of ATP-dependent loading, mutagenesis validation, functional oocyte assay\",\n      \"pmids\": [\"17984224\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"ALY/ALYREF is a physiological substrate of nuclear Akt kinase, which phosphorylates ALY at threonine-219. Nuclear PI3K/Akt signaling regulates ALY's subnuclear speckle residency, mRNA export activity, and cell proliferation. ALY also binds phosphoinositides; phosphoinositide binding (but not Akt phosphorylation) dictates nuclear speckle residency, while both phosphorylation and phosphoinositide binding are required for full mRNA export and proliferation functions.\",\n      \"method\": \"In vitro kinase assay, site-directed mutagenesis (T219 mutant), siRNA knockdown, mRNA export assays, cell proliferation assays, phosphoinositide-binding assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro kinase assay plus mutagenesis plus functional readout, single lab\",\n      \"pmids\": [\"18562279\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Aly/ALYREF and co-adaptor Thoc5 can simultaneously bind non-overlapping sites on the middle (Ntf2-like) domain of the nuclear export receptor Tap/NXF1. Nuclear export of HSP70 mRNA specifically depends on both Thoc5 and Aly. Thoc5 exhibits in vitro RNA-binding activity and associates with HSP70 mRNPs as part of the THO complex.\",\n      \"method\": \"Binding assays with recombinant proteins, RNAi knockdown, RNA immunoprecipitation, in vitro RNA-binding assay\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — recombinant protein binding assays plus functional RNAi phenotype, single lab\",\n      \"pmids\": [\"19165146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Arginine methylation of REF/ALYREF (mapped by mass spectrometry) reduces its RNA-binding activity in vitro and in vivo without affecting the REF:TAP interaction. This reduced RNA-binding affinity in the methylated state is required for efficient displacement of RNA from REF by TAP/NXF1 in vivo, facilitating handover of mRNA to the export receptor.\",\n      \"method\": \"Mass spectrometry mapping of methylation sites, in vitro RNA-binding assays with methylated vs. unmethylated REF, in vivo RNA-binding assays, mRNA export assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mass spectrometry plus functional in vitro and in vivo assays, single lab\",\n      \"pmids\": [\"20129943\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"ATP is strictly required for the interaction between UAP56 and both Aly/ALYREF and CIP29 during TREX complex assembly. Using recombinant proteins, UAP56 bridges an ATP-dependent trimeric complex with Aly and CIP29. UAP56 mediates ATP-dependent interaction between the THO complex and both Aly and CIP29.\",\n      \"method\": \"Proteomic analysis of immunopurified TREX, in vitro reconstitution of trimeric complex with recombinant proteins expressed in E. coli, ATP-dependence assays\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro reconstitution with purified recombinant proteins plus proteomics, rigorous ATP-dependence controls\",\n      \"pmids\": [\"20844015\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"ALYREF directly interacts with THO subunits Thoc2 and Thoc5. Aly, THO, and UAP56 are all required for TREX assembly and for association of UAP56 with the spliced mRNA (but not pre-mRNA). Aly and THO require each other to associate with spliced mRNA. Both Aly and THO link UAP56 to the cap-binding protein CBP80.\",\n      \"method\": \"Systematic RNAi depletion, co-immunoprecipitation, spliced mRNA-association assays, mRNA export assays\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple RNAi conditions plus Co-IP, single lab with multiple orthogonal approaches\",\n      \"pmids\": [\"23222130\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"REF/ALYREF can stabilize nuclear RNAs independently of promoting their export. Tethering REF/ALYREF to the KSHV PAN RNA increases its nuclear abundance and half-life but is insufficient to promote export. REF/ALYREF appears to protect the poly(A) tail from deadenylation, and REF-stabilized transcripts undergo further adenylation over time.\",\n      \"method\": \"Tethering assay (REF fused to MS2 coat protein), RNA half-life measurements, poly(A) tail length analysis, nuclear RNA abundance quantification\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — tethering assay with functional readout of RNA stability, single lab\",\n      \"pmids\": [\"22290432\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A short conserved WxHD motif in an unstructured region of ALYREF is required for RNA binding and for interaction with both eIF4A3 (EJC component) and CBP80 (cap-binding complex). Mutation of this motif impairs proper localization to nuclear speckles and reduces export of a spliced reporter mRNA, indicating this motif coordinates EJC- and cap-dependent assembly of export complexes on spliced mRNAs.\",\n      \"method\": \"Computational discovery of conserved motifs, in vitro splicing assays, site-directed mutagenesis, co-immunoprecipitation, nuclear speckle localization by fluorescence microscopy, spliced mRNA export reporter assay\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis validated by multiple functional readouts, single lab\",\n      \"pmids\": [\"26773052\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"m5C modification in mRNAs is specifically recognized by ALYREF as an mRNA export adaptor, as demonstrated by in vitro binding assays and in vivo RNA immunoprecipitation. m5C formation is mainly catalyzed by NSUN2, and NSUN2 modulates ALYREF's nuclear-cytoplasmic shuttling and RNA-binding affinity. Depletion of NSUN2 reduces ALYREF-mediated mRNA export, which can be restored by wild-type but not methyltransferase-defective NSUN2, establishing ALYREF as an m5C reader that links RNA methylation to mRNA export.\",\n      \"method\": \"In vitro m5C RNA-binding assays, RNA immunoprecipitation (RIP), nuclear-cytoplasmic fractionation, mRNA export assays, NSUN2 reconstitution with methyltransferase-defective mutant, m5C-seq transcriptome profiling\",\n      \"journal\": \"Cell research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro binding plus in vivo RIP plus functional rescue with mutagenesis, multiple orthogonal methods, widely cited and replicated\",\n      \"pmids\": [\"28418038\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"hMTR4 (exosome cofactor) directly competes with ALYREF for binding to ARS2, a component of the cap-binding complex (CBC). This competition determines whether an RNA is degraded by the nuclear exosome or exported to the cytoplasm, establishing ALYREF's ARS2-binding as a critical checkpoint for nuclear RNA fate.\",\n      \"method\": \"Co-immunoprecipitation competition assays, RNAi knockdown, RNA-seq, nuclear RNA abundance measurements\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct competition demonstrated by Co-IP, functional consequence shown by knockdown, single lab\",\n      \"pmids\": [\"28801509\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"ALYREF binds a region adjacent to the stem-loop (SL) structure on replication-dependent histone mRNAs. The SL-binding protein (SLBP) directly interacts with ALYREF and promotes its recruitment. ALYREF promotes histone pre-mRNA 3'-end processing by facilitating U7-snRNP recruitment through physical interaction with the U7-snRNP-specific component Lsm11, and together with other TREX components enhances histone mRNA nuclear export. 3'-end processing in turn promotes ALYREF recruitment.\",\n      \"method\": \"RNA immunoprecipitation, co-immunoprecipitation of ALYREF-SLBP and ALYREF-Lsm11 interactions, 3'-end processing assays, mRNA export assays, RNAi knockdown\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus functional processing and export assays, single lab with multiple methods\",\n      \"pmids\": [\"30858280\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ALYREF forms a nuclear coactivator complex with MYCN that stimulates transcription of USP3. Increased USP3 levels reduce K-48- and K-63-linked ubiquitination of MYCN, stabilizing MYCN protein. ALYREF is required for MYCN-driven effects on the malignant phenotype and for USP3's effect on MYCN stability, defining an ALYREF-MYCN-USP3 axis in neuroblastoma.\",\n      \"method\": \"Co-immunoprecipitation of ALYREF-MYCN complex, ChIP/transcription assays for USP3, ubiquitination assays, transgenic neuroblastoma models in vitro and in vivo, RNAi knockdown\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP plus functional ubiquitination assays plus in vivo model, single lab\",\n      \"pmids\": [\"33767157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ALYREF stabilizes PKM2 mRNA by binding to m5C sites in the 3'-UTR of PKM2 mRNA (demonstrated by RNA immunoprecipitation and RIP-seq). Overexpression of ALYREF promotes bladder cancer cell proliferation via PKM2-mediated glycolysis. HIF-1α indirectly upregulates PKM2 expression by transcriptionally activating ALYREF.\",\n      \"method\": \"RNA immunoprecipitation (RIP), RNA-seq, dual-luciferase reporter assays, Western blotting, in vitro and in vivo cancer cell assays\",\n      \"journal\": \"Cancer communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq for direct binding plus functional assays, single lab\",\n      \"pmids\": [\"33991457\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ALYREF drives glioblastoma cell proliferation via stabilization of MYC mRNA (demonstrated by CLIP assay) and activation of Wnt/β-catenin signaling. MYC transcriptionally regulates ALYREF expression (by ChIP assay), creating a positive feedback loop. ALYREF depletion reduces GBM tumor formation in vivo.\",\n      \"method\": \"ChIP assay, CLIP assay, RNA stability assays, siRNA knockdown, in vitro proliferation and in vivo tumor formation assays\",\n      \"journal\": \"OncoTargets and therapy\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, CLIP and ChIP without deep mutagenesis validation\",\n      \"pmids\": [\"33447056\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"ALYREF binds to the NEAT1 promoter region to enhance global NEAT1 transcriptional activity, and also stabilizes CPSF6 (a protein that selectively promotes the short NEAT1 isoform) and directly binds and stabilizes the short NEAT1 isoform. This selectively fine-tunes the short NEAT1 isoform expression in breast cancer.\",\n      \"method\": \"ChIP assay for ALYREF at NEAT1 promoter, RNA-binding/stability assays, CPSF6 protein level measurement upon ALYREF knockdown, transcriptional profiling, orthotopic mouse model\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, limited orthogonal validation of direct binding mechanism\",\n      \"pmids\": [\"35776213\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"ALYREF specifically binds hypermethylated m5C sites in RABL6 and TK1 mRNA via its K171 domain and controls UCB malignancy by promoting hypermethylated RABL6 and TK1 mRNA splicing and stabilization. ALYREF also recognizes hypermethylated m5C sites in NSUN2 mRNA, resulting in NSUN2 upregulation and creating a cross-regulatory loop between the m5C writer and reader.\",\n      \"method\": \"RNA bisulfite sequencing (BisSeq), RNA-seq, RIP-seq, patient-derived organoids, orthotopic xenograft models, domain mutagenesis (K171)\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multi-omic integration plus domain mutagenesis and functional models, single lab\",\n      \"pmids\": [\"36806253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ALYREF directly binds m5C modification sites in the 3'-UTR of EGFR mRNA, stabilizing EGFR mRNA and consequently activating the STAT3 signaling pathway in hepatocellular carcinoma cells.\",\n      \"method\": \"RNA immunoprecipitation (RIP), RNA stability assays, m5C site identification, in vitro and in vivo functional assays\",\n      \"journal\": \"International journal of biological sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, RIP-based binding evidence without deep mutagenesis of m5C sites\",\n      \"pmids\": [\"38164181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ALYREF recognizes m5C sites in JunD mRNA, maintaining JunD mRNA stability and upregulating SLC7A5 transcription, which depletes amino acids in the tumor microenvironment and restricts CD8+ T cell function in pancreatic ductal adenocarcinoma.\",\n      \"method\": \"RNA immunoprecipitation, RNA stability assays, in vivo tumor growth assays, immune cell function assays, tissue microarray\",\n      \"journal\": \"Cell death discovery\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, RIP-based binding, functional cascade only partially validated mechanistically\",\n      \"pmids\": [\"38402198\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ALYREF forms a complex with ELAVL1 (HuR) to cooperatively promote m5C recognition and nuclear export of RPS6KB2 and RPTOR mRNAs in colorectal cancer cells. E2F6 transcriptionally activates ALYREF expression.\",\n      \"method\": \"RIP-Bis-seq, RNA-seq, Co-immunoprecipitation of ALYREF-ELAVL1 complex, RNA export assays, ChIP for E2F6 at ALYREF promoter\",\n      \"journal\": \"NPJ precision oncology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, Co-IP plus RIP without reconstitution or mutagenesis\",\n      \"pmids\": [\"39455812\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Drosophila Ref1 (orthologue of human ALYREF) genetically interacts with TDP-43 and C9orf72 GGGGCC repeat expansion: Ref1 downregulation mitigates toxicity from both disease proteins by lowering their mRNA and protein levels. Expression of TDP-43 or GGGGCC repeats increases endogenous Ref1 mRNA levels. Human ALYREF protein is upregulated by immunohistochemistry in ALS motor neurons.\",\n      \"method\": \"Drosophila genetic screen, RNAi knockdown, mRNA/protein level quantification, immunohistochemistry of human ALS tissue\",\n      \"journal\": \"Acta neuropathologica communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — genetic epistasis in Drosophila plus IHC, no direct biochemical mechanism established\",\n      \"pmids\": [\"31036086\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"ALYREF promotes NPC metastasis by binding m5C-modified NOTCH1 mRNA, enhancing NOTCH1 mRNA stability in an m5C modification-dependent manner, thereby activating the NOTCH signaling pathway.\",\n      \"method\": \"RNA immunoprecipitation, RNA stability assays, m5C sequencing, in vitro invasion/migration assays, in vivo metastasis model\",\n      \"journal\": \"Cell death & disease\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, RIP-based binding without mutagenesis of binding interface\",\n      \"pmids\": [\"39117671\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"ALYREF, as an m5C reader protein, plays an important role in regulating murine leukemia virus (MLV) replication. m5C is highly enriched in viral genomic RNA relative to cellular mRNAs, and ALYREF knockdown reduces viral production.\",\n      \"method\": \"Mass spectrometry, m5C sequencing at single-nucleotide resolution, siRNA knockdown of ALYREF, viral titer assays\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, functional knockdown phenotype without direct binding mechanism characterization\",\n      \"pmids\": [\"32321818\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"HSV-1 ICP27 interacts with ALY/REF in infected mammalian cells and recruits ALY/REF from spliceosomes to viral transcription sites. This interaction directs viral intronless mRNAs to the TAP/NXF1 export pathway. ICP27 interacts directly with TAP/NXF1 independently of ALY/REF bridging, and this TAP/NXF1 interaction (not the ALY/REF interaction) is required for ICP27 nuclear export.\",\n      \"method\": \"Co-immunoprecipitation, UV cross-linking, dominant-negative TAP export assay, LMB sensitivity assay, immunofluorescence colocalization\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple methods including dominant-negative assay and Co-IP, single lab\",\n      \"pmids\": [\"12438613\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"NMR structure of the HVS ORF57-ALYREF interface was determined at atomic resolution. An α-helix in ORF57 competitively displaces viral RNA from ORF57 when ALYREF is present, while the flexible N-terminal domain of ALYREF engages the viral RNA, creating a ternary ALYREF-ORF57-RNA complex. UV cross-linking and mutagenesis confirmed individual ORF57 residues involved in RNA recognition and the RNA-transfer mechanism.\",\n      \"method\": \"NMR structure determination of ORF57-ALYREF interface, UV cross-linking, site-directed mutagenesis, RNA-binding competition assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — atomic-resolution NMR structure plus mutagenesis plus UV cross-linking in single rigorous study\",\n      \"pmids\": [\"24550725\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"m5C modification of YBX2 and SMO mRNAs is recognized by ALYREF, which exports these mRNAs to the cytoplasm, increasing YBX2 and SMO protein levels. This mechanism inhibits adipogenesis and promotes myogenesis respectively via ALYREF-m5C-YBX2 and ALYREF-m5C-SMO axes.\",\n      \"method\": \"RNA bisulfite sequencing, RNA immunoprecipitation, nuclear-cytoplasmic fractionation, RNA export assays, in vitro adipogenesis/myogenesis differentiation assays\",\n      \"journal\": \"Cellular and molecular life sciences\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, RIP-based evidence without mutagenesis of m5C sites or ALYREF binding domain\",\n      \"pmids\": [\"35962235\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"ALYREF (ALY/REF) is an mRNA export adaptor protein that is recruited to spliced mRNPs by the DEAD-box helicase UAP56 in an ATP-dependent manner, where it links the exon junction complex (via eIF4A3) and the cap-binding complex (via CBP80/ARS2) to the TAP/NXF1 nuclear export receptor; ALYREF also functions as a specific reader of m5C-modified mRNAs through recognition of 5-methylcytosine marks deposited by NSUN2, thereby coupling epitranscriptomic modification to selective mRNA nuclear export, and can additionally stabilize nuclear RNAs independently of export, participate as a transcriptional coactivator (e.g., with LEF-1/AML-1 at the TCRα enhancer and with MYCN at the USP3 promoter), and undergo regulatory post-translational modifications including Akt-mediated phosphorylation at Thr-219 and arginine methylation that fine-tunes RNA handover to TAP/NXF1.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"ALYREF (ALY/REF) is the metazoan mRNA export adaptor that couples nuclear mRNP maturation to nuclear export, recruited to spliced mRNPs in a splicing-dependent manner and capable of accelerating bulk mRNA export in vivo [#0]. Its loading onto RNA is driven by the DEAD-box helicase UAP56, which directly binds ALYREF and, in an ATP-dependent reaction, deposits it onto RNA before dissociating upon ATP hydrolysis—a chaperone-style handoff that also operates on intronless mRNAs [#1, #4, #8]. Within the TREX complex, ALYREF contacts THO subunits THOC2 and THOC5 and bridges UAP56 to the cap-binding protein CBP80, while a short conserved WxHD motif in an unstructured region coordinates simultaneous engagement of the exon junction complex (via eIF4A3) and the cap-binding complex on spliced mRNAs and directs nuclear speckle localization [#9, #11]. ALYREF and the co-adaptor THOC5 occupy non-overlapping sites on the NTF2-like domain of the export receptor TAP/NXF1, and arginine methylation lowers ALYREF's RNA affinity to enable handover of the transcript to TAP/NXF1 [#6, #7]. ALYREF additionally functions as a reader of 5-methylcytosine (m5C)-modified mRNA: it recognizes m5C marks deposited by NSUN2 and couples this epitranscriptomic modification to selective mRNA export [#12]. Its binding to ARS2 within the cap-binding complex constitutes an export-versus-degradation checkpoint, competing with the exosome cofactor hMTR4 to determine nuclear RNA fate [#13]. Beyond export, ALYREF can stabilize nuclear RNAs independently of export by protecting the poly(A) tail [#10], promote histone pre-mRNA 3'-end processing through SLBP- and Lsm11-dependent U7-snRNP recruitment [#14], and act as a transcriptional coactivator with LEF-1/AML-1 at the TCRα enhancer [#2] and with MYCN at the USP3 promoter [#15]. ALYREF activity is regulated by nuclear Akt-mediated phosphorylation at Thr-219 and by phosphoinositide binding, which together control speckle residency and export function [#5]. In disease contexts, ALYREF stabilizes oncogenic m5C-marked transcripts in multiple cancers [#16, #19], and viral proteins including HSV-1 ICP27 and HVS ORF57 hijack ALYREF to route intronless viral RNAs into the TAP/NXF1 export pathway [#26, #27].\",\n  \"teleology\": [\n    {\n      \"year\": 1997,\n      \"claim\": \"Before its export role was known, ALYREF was identified as a transcriptional coactivator, establishing an early and distinct nuclear function in gene activation.\",\n      \"evidence\": \"Yeast two-hybrid, Co-IP, and reporter assays linking ALY to LEF-1/AML-1 activation domains and TCRα enhancer activity\",\n      \"pmids\": [\"9119228\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not establish whether coactivation is separable from RNA-handling functions\", \"No structural basis for activation-domain recognition\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Established ALYREF as a splicing-dependent mRNP component and bona fide mRNA export factor, defining its core cellular role.\",\n      \"evidence\": \"IP of spliced mRNPs, in vivo Xenopus oocyte export assays, shuttling assays\",\n      \"pmids\": [\"11014198\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of recruitment to mRNP not yet defined\", \"Did not identify the export receptor it hands RNA to\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Answered how ALYREF is recruited to spliced mRNPs by showing UAP56 directly binds and loads it, coupling splicing to export.\",\n      \"evidence\": \"Co-IP, in vitro binding, dominant-negative overexpression, ALY point-mutant rescue, export assays\",\n      \"pmids\": [\"11675789\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Energetics of the loading reaction not yet resolved\", \"Did not address intronless mRNA recruitment\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Defined the limits of ALYREF's export role by showing EJC/REF1 is dispensable for bulk export in Drosophila, implying redundant adaptors.\",\n      \"evidence\": \"RNAi depletion in S2 cells with poly(A)+ FISH readout\",\n      \"pmids\": [\"12438415\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of redundant adaptors not established\", \"Species-specific differences from mammals unresolved\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Showed viral exploitation of ALYREF, with HSV-1 ICP27 relocating it to route intronless viral mRNAs into the TAP/NXF1 pathway.\",\n      \"evidence\": \"Co-IP, UV cross-linking, dominant-negative TAP and LMB assays, colocalization\",\n      \"pmids\": [\"12438613\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ICP27 export shown to be ALYREF-independent, leaving ALYREF's necessity for viral RNA export unclear\", \"No structural detail of the interaction\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Resolved the biochemical logic of RNA loading: ATP-bound UAP56 contacts both RNA and ALYREF and chaperones loading onto intronless mRNA.\",\n      \"evidence\": \"In vitro RNA-binding and ATP hydrolysis assays, ATP-binding-deficient UAP56 mutant in oocytes\",\n      \"pmids\": [\"17984224\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry on native mRNPs not defined\", \"Selectivity for specific transcripts unaddressed\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identified post-translational regulation, showing nuclear Akt phosphorylates ALYREF at Thr-219 and that phosphoinositide binding controls speckle residency and export.\",\n      \"evidence\": \"In vitro kinase assay, T219 mutagenesis, siRNA, export and proliferation assays, phosphoinositide binding\",\n      \"pmids\": [\"18562279\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Physiological signals upstream of nuclear Akt toward ALYREF unclear\", \"Single lab; phosphoinositide-binding interface not mapped\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Mapped the ALYREF–NXF1 handoff geometry, showing ALYREF and THOC5 bind non-overlapping sites on the NXF1 NTF2-like domain.\",\n      \"evidence\": \"Recombinant protein binding, RNAi, RNA-IP, in vitro RNA binding\",\n      \"pmids\": [\"19165146\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Transcript selectivity beyond HSP70 not generalized\", \"Order of binding events on NXF1 unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Reconstituted ATP-dependent TREX assembly, showing UAP56 bridges a trimeric complex with ALYREF and CIP29 and links THO to both.\",\n      \"evidence\": \"Proteomics of immunopurified TREX, in vitro reconstitution with recombinant proteins, ATP-dependence assays\",\n      \"pmids\": [\"20844015\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Dynamics of complex disassembly during export unresolved\", \"Spatial coupling to spliceosome not reconstituted\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Explained the RNA-to-receptor handover, showing arginine methylation lowers ALYREF RNA affinity to allow TAP/NXF1 to displace it from mRNA.\",\n      \"evidence\": \"MS mapping of methylation sites, in vitro/in vivo RNA-binding and export assays\",\n      \"pmids\": [\"20129943\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Methyltransferase responsible not identified here\", \"Regulation of methylation timing unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Detailed TREX architecture by showing ALYREF directly binds THOC2/THOC5 and that ALY and THO mutually require each other and link UAP56 to CBP80.\",\n      \"evidence\": \"Systematic RNAi, Co-IP, spliced-mRNA association and export assays\",\n      \"pmids\": [\"23222130\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct vs. indirect CBP80 contact not distinguished here\", \"Single lab\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Uncovered an export-independent function, showing ALYREF can stabilize nuclear RNA by protecting the poly(A) tail.\",\n      \"evidence\": \"MS2 tethering to KSHV PAN RNA, half-life and poly(A) tail measurements\",\n      \"pmids\": [\"22290432\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of poly(A) protection not biochemically defined\", \"Generality to cellular RNAs untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Provided atomic-resolution insight into viral RNA hijacking, defining how HVS ORF57 transfers viral RNA to ALYREF in a ternary complex.\",\n      \"evidence\": \"NMR structure of the ORF57-ALYREF interface, UV cross-linking, mutagenesis, competition assays\",\n      \"pmids\": [\"24550725\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cellular RNA-recognition mode of ALYREF N-terminus not structurally generalized\", \"Does not address full mRNP context\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identified the WxHD motif as the structural hub coordinating EJC (eIF4A3) and cap (CBP80) engagement during export-complex assembly on spliced mRNAs.\",\n      \"evidence\": \"Conserved-motif analysis, in vitro splicing, mutagenesis, Co-IP, speckle localization, export reporter\",\n      \"pmids\": [\"26773052\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How a single short motif achieves multiple contacts unresolved\", \"Structural model of assembled complex absent\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined ALYREF as an m5C reader, coupling NSUN2-deposited methylation to selective mRNA export — a major expansion of its mechanism.\",\n      \"evidence\": \"In vitro m5C binding, RIP, fractionation, export assays, NSUN2 methyltransferase-dead rescue, m5C-seq\",\n      \"pmids\": [\"28418038\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of m5C recognition not defined\", \"Fraction of cellular export that is m5C-dependent unquantified\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Positioned ALYREF at an export-versus-degradation decision point by showing hMTR4 competes with it for ARS2 binding.\",\n      \"evidence\": \"Co-IP competition assays, RNAi, RNA-seq, nuclear RNA quantification\",\n      \"pmids\": [\"28801509\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"What biases the competition for individual transcripts unknown\", \"Single lab\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Extended ALYREF's role to histone mRNA biogenesis, linking it to SLBP- and Lsm11-dependent 3'-end processing as well as export.\",\n      \"evidence\": \"RIP, reciprocal Co-IP, 3'-end processing and export assays, RNAi\",\n      \"pmids\": [\"30858280\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic order of processing vs. recruitment only partly resolved\", \"Single lab\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Connected ALYREF to oncogenic gene regulation, including m5C-dependent stabilization of PKM2 mRNA and coactivation of MYCN at the USP3 promoter.\",\n      \"evidence\": \"RIP/RIP-seq, ChIP and ubiquitination assays, luciferase reporters, in vitro and in vivo cancer models\",\n      \"pmids\": [\"33991457\", \"33767157\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether export vs. stabilization drives the oncogenic effect not fully separated\", \"Single-lab cancer-context studies\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Mapped a domain (K171) required for hypermethylated-m5C recognition and showed ALYREF can promote splicing and stabilization of target transcripts including a writer-reader loop with NSUN2 mRNA.\",\n      \"evidence\": \"RNA BisSeq, RNA-seq, RIP-seq, K171 domain mutagenesis, organoid and xenograft models\",\n      \"pmids\": [\"36806253\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural definition of the K171 m5C-binding pocket absent\", \"Generality of the NSUN2 feedback loop untested\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Multiple cancer studies extended the m5C-reader model to additional transcripts and cooperating factors (e.g., ELAVL1), establishing recurrent oncogenic ALYREF-m5C axes.\",\n      \"evidence\": \"RIP/RIP-Bis-seq, RNA stability/export assays, Co-IP, in vivo tumor models across HCC, PDAC, CRC and NPC\",\n      \"pmids\": [\"38164181\", \"38402198\", \"39455812\", \"39117671\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Largely RIP-based binding without mutagenesis of m5C sites or ALYREF interface\", \"Single-lab, context-specific; mechanistic cascades only partly validated\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How ALYREF's distinct activities — TREX-mediated bulk export, m5C-reader selectivity, transcriptional coactivation, RNA stabilization, and histone-processing — are partitioned and regulated within a single nucleus remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No structural model integrating m5C recognition with the TREX export interface\", \"Rules governing transcript-specific m5C-dependent versus splicing-dependent recruitment unknown\", \"Mechanistic separation of export-coupled vs. export-independent (stabilization, transcription) roles incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 4, 7, 11, 12]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [0, 1, 6, 11]},\n      {\"term_id\": \"GO:0140110\", \"supporting_discovery_ids\": [2, 15]},\n      {\"term_id\": \"GO:0140299\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005654\", \"supporting_discovery_ids\": [0, 5, 11]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [0, 10]},\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [0, 1, 8, 12]},\n      {\"term_id\": \"R-HSA-74160\", \"supporting_discovery_ids\": [2, 15, 18]},\n      {\"term_id\": \"R-HSA-9609507\", \"supporting_discovery_ids\": [0, 6, 12]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [15, 16, 19]}\n    ],\n    \"complexes\": [\"TREX complex\", \"THO complex\"],\n    \"partners\": [\"UAP56\", \"THOC2\", \"THOC5\", \"NXF1\", \"eIF4A3\", \"CBP80\", \"NSUN2\", \"ELAVL1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":9,"faith_total":9,"faith_pct":100.0}}