{"gene":"MCTS1","run_date":"2026-06-10T02:59:50","timeline":{"discoveries":[{"year":1998,"finding":"MCT-1 (MCTS1) is a novel oncogene localized to chromosome Xq22-24 that, when overexpressed in NIH3T3 fibroblasts, shortens G1 phase and promotes anchorage-independent growth. Amino acid homology to a protein-protein binding domain of cyclin H was identified, suggesting a role in cell cycle regulation.","method":"AP-PCR genomic amplification assay, FISH mapping, overexpression in NIH3T3 cells with proliferation and soft agar colony assays","journal":"Cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — defined cellular phenotype (G1 shortening, transformation) via overexpression, single lab with multiple assays","pmids":["9766643"],"is_preprint":false},{"year":1999,"finding":"Overexpression of MCT-1 in NIH3T3 fibroblasts increases cdk4 and cdk6 kinase activity, elevates cyclin D1 protein levels, and enhances G1 cyclin/cdk complex formation, establishing a mechanistic link between MCT-1 and G1 phase cell cycle checkpoint deregulation.","method":"Kinase activity assays, Western blotting, immunoprecipitation in MCT-1-overexpressing NIH3T3 cells","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — kinase activity assays and co-IP, single lab, two orthogonal methods","pmids":["10440924"],"is_preprint":false},{"year":2001,"finding":"MCT-1 protein is stabilized in response to DNA damaging agents (gamma irradiation) without requiring new protein synthesis, indicating post-translational stabilization. MCT-1 protein is constitutively cytoplasmic throughout the cell cycle in human lymphoid tumor cells.","method":"Western blotting after irradiation with and without protein synthesis inhibitors; subcellular fractionation and immunofluorescence","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — protein stability and localization established by direct biochemical assays, single lab, two orthogonal methods","pmids":["11709712"],"is_preprint":false},{"year":2003,"finding":"The MCT-1 promoter contains a TATA-less region with a consensus initiator element and two Sp1 sites for basal transcription. A positive cis-acting enhancer element at -133 to -122 was identified that binds a lymphoid-specific factor (LMBF, ~96 kDa), and this element functions as an enhancer in reverse orientation.","method":"Luciferase reporter assays, electrophoretic mobility shift assay (EMSA), Southwestern blot, deletion analysis of the MCT-1 promoter","journal":"Journal of cellular biochemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — direct promoter reporter and EMSA assays, single lab, multiple orthogonal methods","pmids":["12938157"],"is_preprint":false},{"year":2005,"finding":"MCT-1 overexpression deregulates cell cycle checkpoints: it enhances phosphorylation of H2AX and NBS1, increases DNA damage-induced gamma-H2AX and 53BP1 foci, preferentially increases S-phase population after gamma-irradiation, and causes a G1/S checkpoint defect. MCT-1 also transforms immortalized human mammary epithelial cells and promotes genomic instability. Knockdown of MCT-1 via siRNA attenuates H2AX phosphorylation and the checkpoint defect.","method":"siRNA knockdown, overexpression, flow cytometry, immunofluorescence for gamma-H2AX and 53BP1 foci, Western blotting for checkpoint proteins","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal gain/loss-of-function with specific molecular readouts, multiple orthogonal methods","pmids":["15897892"],"is_preprint":false},{"year":2006,"finding":"MCT-1 protein interacts with the mRNA cap complex through its PUA domain and recruits DENR (DRP), a protein containing the SUI1 translation initiation domain. MCT-1 upregulation modulates the translational profiles (polysome association) of BCL2L2, TFDP1, MRE11A, cyclin D1, and E2F1 mRNAs without changing total cytoplasmic mRNA levels.","method":"Co-immunoprecipitation with cap complex, PUA domain mutant analysis, polysome fractionation with microarray analysis of polysome-associated mRNAs","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — cap complex pull-down with PUA domain mutagenesis, polysome profiling with microarray, multiple orthogonal methods in one study","pmids":["16982740"],"is_preprint":false},{"year":2006,"finding":"MCT-1 protein is phosphorylated by p44/p42 MAPK (ERK1/2), and this phosphorylation is critical for MCT-1 protein stabilization and its ability to promote cell proliferation. Both genetic (dominant-negative MEK) and pharmacological (MEK/ERK inhibitors) approaches demonstrated that blocking ERK activity reduces MCT-1 phosphorylation and stability.","method":"Pharmacological and genetic inhibition of MEK/ERK, Western blotting for MCT-1 phosphorylation and protein stability, proliferation assays","journal":"Oncogene","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — combination of genetic and pharmacological approaches establishing kinase-substrate relationship, multiple orthogonal methods","pmids":["17016429"],"is_preprint":false},{"year":2007,"finding":"Forced induction of MCT-1 decreases p53 expression before and after genomic insults by promoting ubiquitin-dependent proteosomal degradation of p53 (increased ubiquitinated-p53 and phospho-MDM2 levels). MCT-1 also enhances ERK1/ERK2 phosphorylation, and MEK/ERK inhibition or MCT-1 knockdown elevates genotoxin-induced p53 and p21 production. MCT-1 overexpression relaxes S-phase and G2/M checkpoints and causes nuclear MCT-1 redistribution upon genotoxic stress coinciding with gamma-H2AX foci.","method":"Overexpression and knockdown of MCT-1, proteasome inhibitor treatment, Western blotting, flow cytometry, alkaline comet assay, spectral karyotyping, immunofluorescence","journal":"DNA repair","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple mechanistic readouts (proteasome pathway, checkpoint analysis, karyotyping), multiple orthogonal methods, single lab","pmids":["17416211"],"is_preprint":false},{"year":2008,"finding":"A PUA-domain mutant of MCT-1 expressed in human lymphoma cell lines reduces anchorage-independent growth, increases susceptibility to apoptosis, and alters the translational profile of target mRNAs, confirming that the PUA domain is required for MCT-1's oncogenic translational regulatory function.","method":"PUA-domain mutant overexpression, soft agar colony assay, apoptosis assay, polysome fractionation and translational profile analysis","journal":"Leukemia research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — domain mutagenesis with functional cellular and translational phenotype readouts, single lab","pmids":["18824261"],"is_preprint":false},{"year":2009,"finding":"MCT-1 is phosphorylated and upregulated by extracellular signal-regulated kinase (ERK); pharmacological ERK inhibition disrupts MCT-1 phosphorylation and stability. MCT-1 knockdown by shRNA in DLBCL cells induces apoptosis. A functional molecular interaction between MCT-1 and the MEK/ERK signaling pathway is established.","method":"shRNA knockdown, ERK inhibitor treatment, Western blotting for MCT-1 phosphorylation, apoptosis assays, in vivo DLBCL xenograft model","journal":"Cancer research","confidence":"High","confidence_rationale":"Tier 2 / Strong — shRNA knockdown + pharmacological inhibition + in vivo xenograft, multiple orthogonal methods establishing ERK-MCT-1 functional interaction","pmids":["19789340"],"is_preprint":false},{"year":2009,"finding":"MCT-1 overexpression accelerates p53 degradation via the ubiquitin-proteasome pathway. In p53-deficient cells, MCT-1 further increases chromosomal translocations, deregulates G2/M checkpoint, promotes chromosome copy number gain, multinucleation, and cytokinesis failure, and amplifies Ras-MEK-ERK signaling and metastatic molecule expression. Loss of p53 and MCT-1 overexpression synergistically promote tumorigenesis.","method":"Overexpression in p53-deficient and p53-proficient cells, chromosome analysis, flow cytometry for cell cycle, migration/adhesion assays, xenograft tumorigenicity assays","journal":"Molecular cancer research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis between MCT-1 and p53, multiple phenotypic readouts, single lab","pmids":["19372582"],"is_preprint":false},{"year":2010,"finding":"MCT-1 is a novel target gene of p53 transcriptional regulation: wild-type p53 (but not mutant p53) suppresses MCT-1 promoter activity and MCT-1 mRNA stability. In a negative feedback loop, constitutively expressed MCT-1 decreases p53 promoter function and p53 mRNA stability. MDM2, Pirh2, and Cop1 (inhibitors of p53) are stimulated by MCT-1 oncoprotein.","method":"Promoter luciferase reporter assays, mRNA stability assays, Western blotting, p53 response element analysis, ChIP-like functional assays","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter assays and mRNA stability measurement, mutual regulation established, single lab","pmids":["21138557"],"is_preprint":false},{"year":2012,"finding":"MCT-1 is a centrosomal oncoprotein involved in mitosis. Knockdown of MCT-1 causes intercellular bridging, chromosome mis-congregation, cytokinesis delay, and mitotic death. MCT-1 overexpression in p53-deficient cells deregulates mitotic checkpoint kinases and proteins, increasing cytokinesis failure, multinucleation, centrosome amplification, polyploidy, and aneuploidy.","method":"shRNA knockdown, overexpression, immunofluorescence for centrosome markers, flow cytometry for ploidy, time-lapse microscopy of mitotic progression","journal":"Cell cycle","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — loss-of-function and gain-of-function with specific mitotic phenotype readouts, single lab","pmids":["22336915"],"is_preprint":false},{"year":2012,"finding":"MCT-1 acts as a novel regulator of Shc-Ras-MEK-ERK signaling. Knockdown of MCT-1 enhances apoptotic cell death with caspase activation and suppresses cancer cell proliferation, chemo-resistance and tumorigenic capacity.","method":"Shc pathway activity measurement, MCT-1 knockdown, caspase activity assays, xenograft tumor assays","journal":"Oncotarget","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockdown with defined signaling readouts, single lab","pmids":["23211466"],"is_preprint":false},{"year":2014,"finding":"DENR and MCT-1 are the first identified selective regulators of eukaryotic translation re-initiation. mRNAs containing upstream ORFs with strong Kozak sequences (stuORFs) selectively require DENR-MCT-1 for their translation. Loss of DENR or MCT-1 in Drosophila impairs tissue growth by reducing translation of a specific class of mRNAs enriched for regulatory proteins including oncogenic kinases.","method":"Genetic knockdown of DENR and MCT-1 in Drosophila, polysome profiling, reporter assays for uORF-containing mRNA translation, rescue experiments, tissue growth phenotype analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — genetic loss-of-function in vivo, polysome profiling, reporter assays, multiple orthogonal methods; replicated concept in subsequent papers","pmids":["25043021"],"is_preprint":false},{"year":2014,"finding":"MCT-1 overexpression antagonizes PTEN gene presentation, protein stability, and functional activity, further promoting PI3K/AKT signaling. In PTEN-null cancer cells, MCT-1 interacts with p190B and Src in vivo. MCT-1 overexpression and PTEN loss synergistically augment Src/p190B signaling, inhibit RhoA activity, and drive neoplastic multinucleation via spindle multipolarity and cytokinesis failure.","method":"Co-immunoprecipitation (MCT-1 with p190B and Src), shRNA knockdown, PTEN activity assays, RhoA activity assay, xenograft tumorigenicity assay, immunofluorescence","journal":"Oncogene","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP establishing complex, shRNA knockdown with specific signaling readouts, single lab","pmids":["24858043"],"is_preprint":false},{"year":2017,"finding":"Crystal structure of the human small ribosomal subunit in complex with DENR-MCT-1 was determined. The structure reveals that DENR-MCT-1 binds the 40S subunit and the C-terminal domain of DENR occupies a position with striking similarity to canonical eIF1, which controls fidelity of translation initiation and scanning, providing a mechanistic basis for DENR-MCT-1 function in translation initiation and reinitiation.","method":"X-ray crystallography of human 40S ribosomal subunit in complex with DENR-MCT-1","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with direct functional implications, rigorous structural biology","pmids":["28723557"],"is_preprint":false},{"year":2017,"finding":"In human cells, transcripts with short upstream ORFs (stuORFs) of only 1 amino acid are selectively dependent on DENR and MCTS1 for optimal translation, identifying ~100 putative DENR/MCTS1 translational targets enriched for neuronal genes and G protein-coupled receptors.","method":"siRNA knockdown of DENR and MCTS1 in human cells, polysome profiling, reporter assays with stuORF-containing mRNAs","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockdown with polysome profiling and reporter assays, single lab","pmids":["28623304"],"is_preprint":false},{"year":2017,"finding":"MCT-1 activation promotes YY1-EGFR-MnSOD signaling: MCT-1 overexpression suppresses p53 accumulation, elevates MnSOD via the YY1-EGFR signaling cascade, generates intracellular ROS and mitochondrial superoxide, and protects cells against oxidative damage. MCT-1 overexpression in lung cancer cells promotes tumor progression and increases tumor-associated M2 macrophages and cancer-associated fibroblasts.","method":"Overexpression and knockdown, Western blotting, ROS measurement, EGFR inhibition, in vivo lung tumor xenograft model","journal":"Oncogenesis","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain/loss-of-function with specific signaling pathway readouts, single lab","pmids":["28394354"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of the human DENR-MCT-1 heterodimer was determined at 2.0-Å resolution. Four conserved cysteine residues of DENR (C34, C37, C44, C53) form a tetrahedral zinc ion-binding site essential for preserving DENR's MCT-1-binding interface; substitution of all four cysteines with alanine abolished heterodimer formation.","method":"X-ray crystallography, site-directed mutagenesis of zinc-coordinating cysteines, biochemical heterodimer formation assay","journal":"Proceedings of the National Academy of Sciences","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenesis validation in the same study","pmids":["30584092"],"is_preprint":false},{"year":2018,"finding":"Crystal structure of MCTS1 bound to a fragment of DENR was determined. DENR residues Glu42, Tyr43, and Tyr46 are required for MCTS1 binding; MCTS1 residue Phe104 is required for tRNA binding. DENR-MCTS1 dimerization and tRNA binding are both necessary for the complex to promote translation reinitiation in human cells. The DENR-MCTS1 complex can bind tRNA in the absence of the ribosome, suggesting it recruits tRNA analogously to eIF2 in cap-dependent translation.","method":"Crystal structure of DENR-MCTS1, site-directed mutagenesis (DENR E42A/Y43A/Y46A and MCTS1 F104A), tRNA binding assays, reinitiation reporter assays in human cells","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and functional reinitiation assays validating individual residues","pmids":["29889857"],"is_preprint":false},{"year":2018,"finding":"Tma20 (MCT-1), Tma22 (DENR), and Tma64 (eIF2D) function as 40S ribosomal subunit recycling factors in vivo in yeast. Deletion of these genes causes 80S ribosomes to queue behind stop codons (block in 40S recycling), with unrecycled ribosomes able to reinitiate at AUG codons in the 3' UTR. The Tma20/Tma22 (MCT-1/DENR) pathway promotes 40S recycling and can lead to 80S reinitiation in 3' UTRs.","method":"Ribosome profiling (Ribo-seq) of yeast deletion strains, 3' UTR reporter assays, in vitro translation with uORF-containing mRNAs","journal":"Molecular cell","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — ribosome profiling of knockouts with direct stop-codon queuing evidence plus reporter assay validation","pmids":["30146315"],"is_preprint":false},{"year":2019,"finding":"MCT-1 stimulates IL-6 secretion, which promotes monocytic THP-1 polarization into M2-like macrophages and increases TNBC cell invasiveness. MCT-1 elevates soluble IL-6 receptor levels. MCT-1 knockdown induces miR-34a, which inhibits IL-6R expression and activates M1 polarization. MCT-1 increases breast cancer stem cell features further advanced by IL-6 but prevented by tocilizumab (IL-6R antibody).","method":"MCT-1 overexpression and shRNA knockdown, IL-6 ELISA, macrophage polarization assays, miR-34a measurement, tocilizumab treatment, invasion assays, xenograft mouse model","journal":"Molecular cancer","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple gain/loss-of-function experiments with mechanistic pathway readouts, antibody blocking, in vivo validation","pmids":["30885232"],"is_preprint":false},{"year":2020,"finding":"MCTS1 directly binds to TWF1 (twinfilin-1) and this interaction synergistically modulates cyclin D1 and C-Myc translation in luminal A/B breast cancer cells (BT-474 and MCF-7).","method":"Co-immunoprecipitation (direct binding), Western blotting for cyclin D1 and C-Myc protein levels upon MCTS1 modulation","journal":"OncoTargets and therapy","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP, single lab, limited mechanistic follow-up on the interaction","pmids":["32606753"],"is_preprint":false},{"year":2021,"finding":"40S ribosome footprinting directly demonstrated that deletion of TMA20 (MCT-1) and TMA22 (DENR) genes in yeast causes broad accumulation of unrecycled 40S subunits at stop codons. The Tma20/Tma22 heterodimer is responsible for the majority of 40S recycling events while Tma64 (eIF2D) plays a minor role. An autism-associated mutation in TMA22 abolishes 40S recycling activity.","method":"40S-specific ribosome footprinting in yeast deletion strains, TMA22 autism mutation analysis","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — direct 40S footprinting method showing stop-codon accumulation in knockouts; orthogonal to ribosome profiling; autism mutation further validates functional importance","pmids":["34016977"],"is_preprint":false},{"year":2022,"finding":"MCTS1 interacts with LARP7 via Co-IP (mainly in the cytoplasm), increases LARP7 protein half-life, and reduces LARP7 poly-ubiquitination, thereby enhancing LSCC cell viability and cell cycle progression (CDK1, CDK2, cyclin A2, cyclin B1). LARP7 overexpression partly reversed the effects of MCTS1 knockdown.","method":"Co-immunoprecipitation, cycloheximide chase assay, ubiquitination Co-IP assay, knockdown/overexpression with cell cycle marker Western blotting","journal":"Clinical and experimental pharmacology & physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with CHX chase and ubiquitination assay, multiple orthogonal methods, single lab","pmids":["35274760"],"is_preprint":false},{"year":2023,"finding":"MCTS1 interacts with OTUD6B isoform 1 (OTUD6B-1) in laryngeal squamous cell carcinoma cells, and MCTS1 negatively modulates LIN28B degradation by enhancing OTUD6B-1-mediated cleavage of K48-branched ubiquitin chains from LIN28B, thereby stabilizing LIN28B and promoting cyclin D1, cyclin E1, and c-Myc expression.","method":"Co-immunoprecipitation (MCTS1-OTUD6B-1 interaction), ubiquitination assays (K48-branched chains), shRNA knockdown, in vitro and in vivo proliferation assays","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Co-IP with specific ubiquitin chain analysis, single lab, two orthogonal methods","pmids":["37634410"],"is_preprint":false},{"year":2023,"finding":"Complete MCTS1 deficiency in humans impairs translation re-initiation of a subset of proteins including JAK2 in all cell types tested (T lymphocytes and phagocytes). Reduced JAK2 expression impairs cellular responses to IL-23 and partially IL-12, but not other JAK2-dependent cytokines. Defective IL-23 responses preferentially impair IFN-γ production by MAIT cells and γδ T lymphocytes upon mycobacterial challenge, causing Mendelian susceptibility to mycobacterial disease.","method":"Genetic analysis of MCTS1-deficient patients, Western blotting for JAK2 in multiple cell types, functional assays of cytokine signaling (IL-23, IL-12 responses), IFN-γ production assays upon mycobacterial stimulation","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — human genetic disease model with direct biochemical validation (JAK2 protein levels), functional cytokine signaling assays, multiple cell types, replicated across multiple families","pmids":["37875108"],"is_preprint":false},{"year":2010,"finding":"MCT-1 promoter activity is suppressed by wild-type p53 (containing p53 response elements in the promoter region), while constitutive MCT-1 expression decreases p53 promoter function and p53 mRNA stability, establishing a mutual negative feedback loop at the transcriptional level.","method":"Luciferase reporter assays with MCT-1 promoter containing p53 response elements, mRNA stability assays, ChIP-type analysis","journal":"Molecular cancer","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — promoter reporter assays with response element mapping and mRNA stability assays, single lab","pmids":["21138557"],"is_preprint":false}],"current_model":"MCTS1 (MCT-1) is a PUA-domain-containing oncogenic protein that forms a heterodimer with DENR (stabilized by a zinc-binding site in DENR), binds the 40S ribosomal subunit (structurally characterized by X-ray crystallography), and functions as a selective regulator of translation re-initiation and 40S subunit recycling at stop codons, particularly for mRNAs with short upstream ORFs of strong Kozak context; at the cellular level, MCT-1 is phosphorylated and stabilized by ERK1/2, downregulates p53 via ubiquitin-proteasome-mediated degradation, deregulates G1 cyclin/CDK activity and DNA damage checkpoints to promote cell cycle progression, activates Shc-Ras-MEK-ERK and PI3K/AKT survival signaling, and drives IL-6/IL-6R-mediated tumor microenvironment remodeling; in humans, complete MCTS1 deficiency specifically impairs JAK2 translation, reducing IL-23 responsiveness and IFN-γ production by innate-like T cells, causing susceptibility to mycobacterial disease."},"narrative":{"mechanistic_narrative":"MCTS1 (MCT-1) is a PUA-domain-containing translational regulator and oncoprotein that, together with its obligate heterodimeric partner DENR, controls the recycling of the small (40S) ribosomal subunit at stop codons and the re-initiation of translation on transcripts bearing short upstream ORFs [PMID:16982740, PMID:25043021, PMID:30146315]. Structural work places the DENR-MCT-1 heterodimer on the 40S subunit with DENR's C-terminal domain occupying a position resembling eIF1, and shows that heterodimer integrity depends on a tetrahedral zinc site formed by four conserved DENR cysteines while the MCTS1 surface (residue Phe104) mediates tRNA binding required for re-initiation [PMID:28723557, PMID:30584092, PMID:29889857]. Loss-of-function studies across Drosophila, yeast and human cells establish that this complex selectively governs translation of stuORF-containing mRNAs enriched for regulatory proteins and is responsible for the bulk of 40S recycling events, with unrecycled ribosomes queuing behind stop codons in its absence [PMID:25043021, PMID:30146315, PMID:34016977]. In its oncogenic capacity, MCT-1 is phosphorylated and stabilized by ERK1/2 and shortens G1 phase by elevating cyclin D1 and CDK4/6 activity [PMID:10440924, PMID:17016429], remodels translational profiles of growth-regulatory mRNAs through its PUA domain [PMID:16982740, PMID:18824261], and drives genomic instability via deregulation of DNA-damage and mitotic checkpoints [PMID:15897892, PMID:22336915]. MCT-1 antagonizes p53 by promoting its ubiquitin-proteasome-mediated degradation within a mutual negative-feedback loop and amplifies Shc-Ras-MEK-ERK and PI3K/AKT survival signaling, while also reshaping the tumor microenvironment through IL-6/IL-6R signaling [PMID:17416211, PMID:21138557, PMID:23211466, PMID:24858043, PMID:30885232]. In humans, complete MCTS1 deficiency selectively impairs re-initiation of JAK2, reducing IL-23 responsiveness and IFN-γ production by innate-like T cells and causing Mendelian susceptibility to mycobacterial disease [PMID:37875108].","teleology":[{"year":1998,"claim":"Established MCTS1 as a candidate oncogene by showing its overexpression shortens G1 and confers anchorage-independent growth, framing it as a cell-cycle-linked transforming protein.","evidence":"Genomic amplification mapping plus overexpression and soft-agar assays in NIH3T3 fibroblasts","pmids":["9766643"],"confidence":"Medium","gaps":["Molecular activity undefined","No endogenous loss-of-function","Cyclin H homology inferred, not functionally tested"]},{"year":1999,"claim":"Connected MCT-1 to a specific G1 checkpoint mechanism by showing it elevates cyclin D1 and CDK4/6 activity, moving beyond a phenotypic to a molecular link.","evidence":"Kinase activity assays and co-IP in MCT-1-overexpressing NIH3T3 cells","pmids":["10440924"],"confidence":"Medium","gaps":["Mechanism by which MCT-1 raises cyclin D1 not determined","Overexpression-only"]},{"year":2001,"claim":"Showed MCT-1 is post-translationally stabilized after DNA damage and is constitutively cytoplasmic, indicating regulation at the protein rather than transcript level.","evidence":"Western blotting with protein-synthesis inhibitors and subcellular fractionation in lymphoid tumor cells","pmids":["11709712"],"confidence":"Medium","gaps":["Stabilizing modification/enzyme not identified","Functional consequence of damage stabilization unclear"]},{"year":2003,"claim":"Defined the transcriptional control of MCTS1 itself, identifying a TATA-less promoter with Sp1 sites and a lymphoid-specific enhancer.","evidence":"Luciferase reporters, EMSA and Southwestern blot of the MCT-1 promoter","pmids":["12938157"],"confidence":"Medium","gaps":["LMBF factor not molecularly identified","Promoter regulation in non-lymphoid contexts untested"]},{"year":2005,"claim":"Demonstrated reciprocally (gain and loss of function) that MCT-1 deregulates the G1/S DNA-damage checkpoint and drives genomic instability and epithelial transformation.","evidence":"siRNA and overexpression with gamma-H2AX/53BP1 foci, flow cytometry and Western blotting in human epithelial cells","pmids":["15897892"],"confidence":"High","gaps":["Direct molecular target linking MCT-1 to checkpoint proteins not established"]},{"year":2006,"claim":"Identified the molecular activity of MCTS1: its PUA domain engages the mRNA cap complex and recruits the SUI1-domain protein DENR, linking MCT-1 to selective translational regulation of growth mRNAs.","evidence":"Cap-complex co-IP with PUA-domain mutants and polysome profiling with microarray","pmids":["16982740"],"confidence":"High","gaps":["Mechanism of mRNA selectivity unresolved at this stage","Cap-binding mode not structurally defined"]},{"year":2006,"claim":"Placed MCT-1 downstream of MEK/ERK by showing ERK1/2 phosphorylation stabilizes the protein and is required for its proliferative function, defining an upstream regulatory kinase.","evidence":"Genetic (dominant-negative MEK) and pharmacological ERK inhibition with phospho/stability Westerns and proliferation assays","pmids":["17016429"],"confidence":"High","gaps":["Direct phosphorylation sites not mapped","Whether ERK phosphorylates MCT-1 directly vs indirectly not resolved"]},{"year":2007,"claim":"Established that MCT-1 suppresses p53 by promoting its ubiquitin-proteasome degradation and relaxes S/G2-M checkpoints, defining a mechanism for genome-destabilizing oncogenesis.","evidence":"Overexpression/knockdown, proteasome inhibition, comet assay, karyotyping and immunofluorescence","pmids":["17416211"],"confidence":"High","gaps":["Whether MCT-1 acts directly on the p53 degradation machinery not shown"]},{"year":2009,"claim":"Consolidated the ERK-MCT-1 axis as a survival pathway in lymphoma, showing knockdown induces apoptosis in vitro and reduces tumor growth in vivo.","evidence":"shRNA knockdown, ERK inhibition, apoptosis assays and DLBCL xenografts","pmids":["19789340"],"confidence":"High","gaps":["Translational targets mediating survival not identified here"]},{"year":2009,"claim":"Showed genetic epistasis with p53: MCT-1 and p53 loss synergize to drive chromosomal instability and Ras-MEK-ERK amplification, defining a cooperative tumorigenic context.","evidence":"Overexpression in p53-null vs proficient cells, chromosome analysis, migration and xenograft assays","pmids":["19372582"],"confidence":"Medium","gaps":["Single-lab phenotype set","Direct mechanism of synergy not dissected"]},{"year":2010,"claim":"Defined a mutual negative-feedback loop in which p53 transcriptionally represses MCTS1 while MCT-1 suppresses p53 promoter function and stimulates p53 inhibitors (MDM2, Pirh2, Cop1).","evidence":"Promoter luciferase reporters, mRNA stability assays and response-element analysis","pmids":["21138557","21138557"],"confidence":"Medium","gaps":["Direct p53 binding to MCTS1 promoter shown functionally but not by definitive ChIP","Loop dynamics in vivo untested"]},{"year":2014,"claim":"Established the core biological function: DENR-MCT-1 are the first selective regulators of translation re-initiation, required for stuORF-containing mRNAs encoding regulatory proteins and tissue growth.","evidence":"Genetic knockdown in Drosophila with polysome profiling, uORF reporters and rescue","pmids":["25043021"],"confidence":"High","gaps":["Structural basis of 40S engagement not yet shown","Mammalian target set not enumerated here"]},{"year":2014,"claim":"Linked MCT-1 to PI3K/AKT by showing it antagonizes PTEN and physically associates with Src and p190B, integrating translational and cytoskeletal/survival signaling.","evidence":"Co-IP (MCT-1 with Src/p190B), shRNA, PTEN and RhoA activity assays and xenografts","pmids":["24858043"],"confidence":"Medium","gaps":["Whether Src/p190B binding is direct not established","Single-lab"]},{"year":2017,"claim":"Provided the structural mechanism by solving the human 40S-DENR-MCT-1 complex, revealing DENR's eIF1-like positioning that rationalizes its role in initiation fidelity and re-initiation.","evidence":"X-ray crystallography of the human 40S subunit with DENR-MCT-1","pmids":["28723557"],"confidence":"High","gaps":["mRNA and tRNA positions not resolved in this structure"]},{"year":2017,"claim":"Extended the re-initiation function to human cells, identifying ~100 stuORF-dependent targets enriched for neuronal genes and GPCRs.","evidence":"siRNA of DENR/MCTS1 with polysome profiling and stuORF reporters in human cells","pmids":["28623304"],"confidence":"Medium","gaps":["Target list putative","Physiological consequences of neuronal targets not tested"]},{"year":2018,"claim":"Resolved heterodimer architecture, showing a DENR zinc site (C34/C37/C44/C53) is essential for the MCT-1-binding interface.","evidence":"2.0-Å crystal structure with cysteine-to-alanine mutagenesis and dimerization assays","pmids":["30584092"],"confidence":"High","gaps":["Whether zinc-site disruption phenocopies re-initiation loss in cells not shown here"]},{"year":2018,"claim":"Defined the residues governing dimerization and tRNA binding (DENR E42/Y43/Y46; MCTS1 F104), and showed the complex binds tRNA ribosome-independently like eIF2, mechanistically explaining re-initiation.","evidence":"DENR-MCTS1 crystal structure, mutagenesis, tRNA-binding and reinitiation reporter assays in human cells","pmids":["29889857"],"confidence":"High","gaps":["tRNA species selectivity not characterized","In vivo tRNA delivery step not directly visualized"]},{"year":2018,"claim":"Defined the conserved in vivo activity of MCT-1/DENR orthologs as 40S recycling factors, showing knockout causes 80S queuing at stop codons and 3'UTR reinitiation.","evidence":"Ribosome profiling of yeast TMA20/TMA22 deletions, 3'UTR reporters and in vitro translation","pmids":["30146315"],"confidence":"High","gaps":["Relative contribution vs eIF2D quantified later","Mammalian recycling not directly measured here"]},{"year":2021,"claim":"Quantified recycling activity using 40S-specific footprinting, showing the MCT-1/DENR heterodimer mediates the majority of 40S recycling and that a disease mutation in DENR abolishes it.","evidence":"40S ribosome footprinting in yeast deletion strains plus autism-mutation analysis","pmids":["34016977"],"confidence":"High","gaps":["Mechanism distinguishing recycling from reinitiation outcomes not fully resolved"]},{"year":2022,"claim":"Identified a deubiquitination-stabilization role in which MCTS1 binds LARP7, extends its half-life and reduces its ubiquitination to drive cell-cycle progression in laryngeal cancer.","evidence":"Co-IP, cycloheximide chase and ubiquitination Co-IP with cell-cycle Westerns","pmids":["35274760"],"confidence":"Medium","gaps":["Whether MCTS1 binding is direct vs complex-mediated unclear","Mechanism linking binding to reduced ubiquitination not defined"]},{"year":2023,"claim":"Showed MCTS1 stabilizes the oncofetal regulator LIN28B by enhancing OTUD6B-1-mediated removal of K48 ubiquitin chains, expanding its protein-stabilizing repertoire.","evidence":"Co-IP, K48-chain ubiquitination assays, shRNA and proliferation assays in laryngeal carcinoma","pmids":["37634410"],"confidence":"Medium","gaps":["Direct enzymatic role of MCTS1 in deubiquitination not established","Single tumor type"]},{"year":2023,"claim":"Defined the human disease phenotype: complete MCTS1 deficiency selectively impairs JAK2 re-initiation, blunting IL-23 responses and IFN-γ production by innate-like T cells, causing Mendelian susceptibility to mycobacterial disease.","evidence":"Patient genetics, JAK2 Westerns across cell types, cytokine-signaling and IFN-γ assays upon mycobacterial challenge","pmids":["37875108"],"confidence":"High","gaps":["Why JAK2 is uniquely sensitive among targets not fully explained","Therapeutic correction untested"]},{"year":null,"claim":"How MCT-1's translational re-initiation/recycling function mechanistically connects to its protein-stabilization (deubiquitination) and oncogenic signaling activities, and how target selectivity (e.g., JAK2) is determined, remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking ribosome recycling to p53/PTEN/LARP7/LIN28B regulation","Determinants of mammalian target selectivity undefined","Direct vs indirect roles in protein stabilization unresolved"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[5,14,17,20,21,24]},{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[20]},{"term_id":"GO:0060090","term_label":"molecular adaptor activity","supporting_discovery_ids":[5,16,19,20]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[2,25]},{"term_id":"GO:0005840","term_label":"ribosome","supporting_discovery_ids":[16,21,24]},{"term_id":"GO:0005815","term_label":"microtubule organizing center","supporting_discovery_ids":[12]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[5,14,21,24]},{"term_id":"R-HSA-1640170","term_label":"Cell Cycle","supporting_discovery_ids":[1,4,12]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[6,13,15]},{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[27]}],"complexes":["DENR-MCTS1 heterodimer","40S ribosomal subunit (DENR-MCT-1 bound)"],"partners":["DENR","SRC","P190B","TWF1","LARP7","OTUD6B"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q9ULC4","full_name":"Malignant T-cell-amplified sequence 1","aliases":["Multiple copies T-cell malignancies"],"length_aa":181,"mass_kda":20.6,"function":"Translation regulator forming a complex with DENR to promote translation reinitiation. Translation reinitiation is the process where the small ribosomal subunit remains attached to the mRNA following termination of translation of a regulatory upstream ORF (uORF), and resume scanning on the same mRNA molecule to initiate translation of a downstream ORF, usually the main ORF (mORF). The MCTS1/DENR complex is pivotal to two linked mechanisms essential for translation reinitiation. Firstly, the dissociation of deacylated tRNAs from post-termination 40S ribosomal complexes during ribosome recycling. Secondly, the recruitment in an EIF2-independent manner of aminoacylated initiator tRNA to P site of 40S ribosomes for a new round of translation (PubMed:16982740, PubMed:20713520, PubMed:37875108). This regulatory mechanism governs the translation of more than 150 genes which translation reinitiation is MCTS1/DENR complex-dependent (PubMed:16982740, PubMed:20713520, PubMed:37875108). Consequently, modulates various unrelated biological processes including cell cycle regulation and DNA damage signaling and repair (PubMed:10440924, PubMed:11709712, PubMed:12637315, PubMed:15897892, PubMed:16322206, PubMed:17016429, PubMed:17416211, PubMed:9766643). Notably, it positively regulates interferon gamma immunity to mycobacteria by enhancing the translation of JAK2 (PubMed:37875108)","subcellular_location":"Cytoplasm","url":"https://www.uniprot.org/uniprotkb/Q9ULC4/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/MCTS1","classification":"Not Classified","n_dependent_lines":62,"n_total_lines":1208,"dependency_fraction":0.05132450331125828},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/MCTS1","total_profiled":1310},"omim":[{"mim_id":"620406","title":"MCTS FAMILY, MEMBER 2; MCTS2","url":"https://www.omim.org/entry/620406"},{"mim_id":"301115","title":"IMMUNODEFICIENCY 118; IMD118","url":"https://www.omim.org/entry/301115"},{"mim_id":"300587","title":"MALIGNANT T-CELL AMPLIFIED SEQUENCE 1; MCTS1","url":"https://www.omim.org/entry/300587"},{"mim_id":"300354","title":"INTELLECTUAL DEVELOPMENTAL DISORDER, X-LINKED, SYNDROMIC, CABEZAS TYPE; MRXSC","url":"https://www.omim.org/entry/300354"},{"mim_id":"300304","title":"CULLIN 4B; CUL4B","url":"https://www.omim.org/entry/300304"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Cytosol","reliability":"Supported"},{"location":"Plasma membrane","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/MCTS1"},"hgnc":{"alias_symbol":["MCT-1"],"prev_symbol":[]},"alphafold":{"accession":"Q9ULC4","domains":[{"cath_id":"3.10.400.20","chopping":"10-84","consensus_level":"medium","plddt":97.2953,"start":10,"end":84},{"cath_id":"3.10.400.20","chopping":"93-168","consensus_level":"medium","plddt":97.4272,"start":93,"end":168}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9ULC4","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q9ULC4-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q9ULC4-F1-predicted_aligned_error_v6.png","plddt_mean":97.25},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=MCTS1","jax_strain_url":"https://www.jax.org/strain/search?query=MCTS1"},"sequence":{"accession":"Q9ULC4","fasta_url":"https://rest.uniprot.org/uniprotkb/Q9ULC4.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q9ULC4/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q9ULC4"}},"corpus_meta":[{"pmid":"30885232","id":"PMC_30885232","title":"MCT-1/miR-34a/IL-6/IL-6R signaling axis promotes EMT progression, cancer stemness and M2 macrophage polarization in triple-negative breast cancer.","date":"2019","source":"Molecular cancer","url":"https://pubmed.ncbi.nlm.nih.gov/30885232","citation_count":364,"is_preprint":false},{"pmid":"9374487","id":"PMC_9374487","title":"Comparison of lactate transport in astroglial cells and monocarboxylate transporter 1 (MCT 1) expressing Xenopus laevis oocytes. Expression of two different monocarboxylate transporters in astroglial cells and neurons.","date":"1997","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/9374487","citation_count":281,"is_preprint":false},{"pmid":"25043021","id":"PMC_25043021","title":"DENR-MCT-1 promotes translation re-initiation downstream of uORFs to control tissue growth.","date":"2014","source":"Nature","url":"https://pubmed.ncbi.nlm.nih.gov/25043021","citation_count":150,"is_preprint":false},{"pmid":"12034734","id":"PMC_12034734","title":"Luminal leptin enhances CD147/MCT-1-mediated uptake of butyrate in the human intestinal cell line Caco2-BBE.","date":"2002","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12034734","citation_count":97,"is_preprint":false},{"pmid":"11896024","id":"PMC_11896024","title":"Changes in MCT 1, MCT 4, and LDH expression are tissue specific in rats after long-term hypobaric hypoxia.","date":"2002","source":"Journal of applied physiology (Bethesda, Md. : 1985)","url":"https://pubmed.ncbi.nlm.nih.gov/11896024","citation_count":90,"is_preprint":false},{"pmid":"27729975","id":"PMC_27729975","title":"Lactate/pyruvate transporter MCT-1 is a direct Wnt target that confers sensitivity to 3-bromopyruvate in colon cancer.","date":"2016","source":"Cancer & metabolism","url":"https://pubmed.ncbi.nlm.nih.gov/27729975","citation_count":78,"is_preprint":false},{"pmid":"16959859","id":"PMC_16959859","title":"Testosterone increases lactate transport, monocarboxylate transporter (MCT) 1 and MCT4 in rat skeletal muscle.","date":"2006","source":"The Journal of physiology","url":"https://pubmed.ncbi.nlm.nih.gov/16959859","citation_count":76,"is_preprint":false},{"pmid":"30146315","id":"PMC_30146315","title":"Tma64/eIF2D, Tma20/MCT-1, and Tma22/DENR Recycle Post-termination 40S Subunits In Vivo.","date":"2018","source":"Molecular cell","url":"https://pubmed.ncbi.nlm.nih.gov/30146315","citation_count":67,"is_preprint":false},{"pmid":"37399358","id":"PMC_37399358","title":"Inhibition of lactate transport by MCT-1 blockade improves chimeric antigen receptor T-cell therapy against B-cell malignancies.","date":"2023","source":"Journal for immunotherapy of cancer","url":"https://pubmed.ncbi.nlm.nih.gov/37399358","citation_count":57,"is_preprint":false},{"pmid":"9766643","id":"PMC_9766643","title":"A novel candidate oncogene, MCT-1, is involved in cell cycle progression.","date":"1998","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/9766643","citation_count":57,"is_preprint":false},{"pmid":"28723557","id":"PMC_28723557","title":"Crystal Structure of the Human Ribosome in Complex with DENR-MCT-1.","date":"2017","source":"Cell reports","url":"https://pubmed.ncbi.nlm.nih.gov/28723557","citation_count":52,"is_preprint":false},{"pmid":"28623304","id":"PMC_28623304","title":"Identification of transcripts with short stuORFs as targets for DENR•MCTS1-dependent translation in human cells.","date":"2017","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/28623304","citation_count":46,"is_preprint":false},{"pmid":"16982740","id":"PMC_16982740","title":"MCT-1 protein interacts with the cap complex and modulates messenger RNA translational profiles.","date":"2006","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/16982740","citation_count":43,"is_preprint":false},{"pmid":"16322206","id":"PMC_16322206","title":"MCT-1 oncogene contributes to increased in vivo tumorigenicity of MCF7 cells by promotion of angiogenesis and inhibition of apoptosis.","date":"2005","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/16322206","citation_count":38,"is_preprint":false},{"pmid":"12637315","id":"PMC_12637315","title":"Expression of the candidate MCT-1 oncogene in B- and T-cell lymphoid malignancies.","date":"2003","source":"Blood","url":"https://pubmed.ncbi.nlm.nih.gov/12637315","citation_count":37,"is_preprint":false},{"pmid":"29889857","id":"PMC_29889857","title":"DENR-MCTS1 heterodimerization and tRNA recruitment are required for translation reinitiation.","date":"2018","source":"PLoS biology","url":"https://pubmed.ncbi.nlm.nih.gov/29889857","citation_count":35,"is_preprint":false},{"pmid":"37875108","id":"PMC_37875108","title":"Human MCTS1-dependent translation of JAK2 is essential for IFN-γ immunity to mycobacteria.","date":"2023","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/37875108","citation_count":34,"is_preprint":false},{"pmid":"18375207","id":"PMC_18375207","title":"Monocarboxylate transporter (MCT)-1 is up-regulated by PPARalpha.","date":"2008","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/18375207","citation_count":34,"is_preprint":false},{"pmid":"15897892","id":"PMC_15897892","title":"The MCT-1 oncogene product impairs cell cycle checkpoint control and transforms human mammary epithelial cells.","date":"2005","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/15897892","citation_count":32,"is_preprint":false},{"pmid":"24081524","id":"PMC_24081524","title":"Effect of AMPK activation on monocarboxylate transporter (MCT)1 and MCT4 in denervated muscle.","date":"2013","source":"The journal of physiological sciences : JPS","url":"https://pubmed.ncbi.nlm.nih.gov/24081524","citation_count":32,"is_preprint":false},{"pmid":"34016977","id":"PMC_34016977","title":"40S ribosome profiling reveals distinct roles for Tma20/Tma22 (MCT-1/DENR) and Tma64 (eIF2D) in 40S subunit recycling.","date":"2021","source":"Nature communications","url":"https://pubmed.ncbi.nlm.nih.gov/34016977","citation_count":32,"is_preprint":false},{"pmid":"21148623","id":"PMC_21148623","title":"Effect of training and detraining on monocarboxylate transporter (MCT) 1 and MCT4 in Thoroughbred horses.","date":"2010","source":"Experimental physiology","url":"https://pubmed.ncbi.nlm.nih.gov/21148623","citation_count":30,"is_preprint":false},{"pmid":"28394354","id":"PMC_28394354","title":"Oncogenic MCT-1 activation promotes YY1-EGFR-MnSOD signaling and tumor progression.","date":"2017","source":"Oncogenesis","url":"https://pubmed.ncbi.nlm.nih.gov/28394354","citation_count":28,"is_preprint":false},{"pmid":"10440924","id":"PMC_10440924","title":"Increased G1 cyclin/cdk activity in cells overexpressing the candidate oncogene, MCT-1.","date":"1999","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/10440924","citation_count":26,"is_preprint":false},{"pmid":"19789340","id":"PMC_19789340","title":"Extracellular signal-regulated kinase positively regulates the oncogenic activity of MCT-1 in diffuse large B-cell lymphoma.","date":"2009","source":"Cancer research","url":"https://pubmed.ncbi.nlm.nih.gov/19789340","citation_count":25,"is_preprint":false},{"pmid":"38505617","id":"PMC_38505617","title":"Immunotherapeutic IL-6R and targeting the MCT-1/IL-6/CXCL7/PD-L1 circuit prevent relapse and metastasis of triple-negative breast cancer.","date":"2024","source":"Theranostics","url":"https://pubmed.ncbi.nlm.nih.gov/38505617","citation_count":24,"is_preprint":false},{"pmid":"23211466","id":"PMC_23211466","title":"Targeting MCT-1 oncogene inhibits Shc pathway and xenograft tumorigenicity.","date":"2012","source":"Oncotarget","url":"https://pubmed.ncbi.nlm.nih.gov/23211466","citation_count":24,"is_preprint":false},{"pmid":"19372582","id":"PMC_19372582","title":"Loss of p53 and MCT-1 overexpression synergistically promote chromosome instability and tumorigenicity.","date":"2009","source":"Molecular cancer research : MCR","url":"https://pubmed.ncbi.nlm.nih.gov/19372582","citation_count":24,"is_preprint":false},{"pmid":"17416211","id":"PMC_17416211","title":"MCT-1 oncogene downregulates p53 and destabilizes genome structure in the response to DNA double-strand damage.","date":"2007","source":"DNA repair","url":"https://pubmed.ncbi.nlm.nih.gov/17416211","citation_count":24,"is_preprint":false},{"pmid":"10440131","id":"PMC_10440131","title":"A model system for the study of human retinal angiogenesis: activation of monocytes and endothelial cells and the association with the expression of the monocarboxylate transporter type 1 (MCT-1).","date":"1999","source":"Diabetologia","url":"https://pubmed.ncbi.nlm.nih.gov/10440131","citation_count":24,"is_preprint":false},{"pmid":"24858043","id":"PMC_24858043","title":"MCT-1 expression and PTEN deficiency synergistically promote neoplastic multinucleation through the Src/p190B signaling activation.","date":"2014","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/24858043","citation_count":23,"is_preprint":false},{"pmid":"16514190","id":"PMC_16514190","title":"Glucose affects monocarboxylate cotransporter (MCT) 1 expression during mouse preimplantation development.","date":"2006","source":"Reproduction (Cambridge, England)","url":"https://pubmed.ncbi.nlm.nih.gov/16514190","citation_count":22,"is_preprint":false},{"pmid":"30584092","id":"PMC_30584092","title":"Crystal structure of the DENR-MCT-1 complex revealed zinc-binding site essential for heterodimer formation.","date":"2018","source":"Proceedings of the National Academy of Sciences of the United States of America","url":"https://pubmed.ncbi.nlm.nih.gov/30584092","citation_count":19,"is_preprint":false},{"pmid":"17016429","id":"PMC_17016429","title":"Phosphorylation of MCT-1 by p44/42 MAPK is required for its stabilization in response to DNA damage.","date":"2006","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/17016429","citation_count":19,"is_preprint":false},{"pmid":"23187830","id":"PMC_23187830","title":"Expression and role of GLUT-1, MCT-1, and MCT-4 in malignant pleural mesothelioma.","date":"2012","source":"Virchows Archiv : an international journal of pathology","url":"https://pubmed.ncbi.nlm.nih.gov/23187830","citation_count":17,"is_preprint":false},{"pmid":"21138557","id":"PMC_21138557","title":"The antagonism between MCT-1 and p53 affects the tumorigenic outcomes.","date":"2010","source":"Molecular cancer","url":"https://pubmed.ncbi.nlm.nih.gov/21138557","citation_count":15,"is_preprint":false},{"pmid":"32104489","id":"PMC_32104489","title":"A novel oral prodrug-targeting transporter MCT 1: 5-fluorouracil-dicarboxylate monoester conjugates.","date":"2019","source":"Asian journal of pharmaceutical sciences","url":"https://pubmed.ncbi.nlm.nih.gov/32104489","citation_count":15,"is_preprint":false},{"pmid":"18824261","id":"PMC_18824261","title":"Targeted suppression of MCT-1 attenuates the malignant phenotype through a translational mechanism.","date":"2008","source":"Leukemia research","url":"https://pubmed.ncbi.nlm.nih.gov/18824261","citation_count":15,"is_preprint":false},{"pmid":"21826525","id":"PMC_21826525","title":"Expression of monocarboxylate transporter (MCT) 1 and MCT4 in overloaded mice plantaris muscle.","date":"2011","source":"The journal of physiological sciences : JPS","url":"https://pubmed.ncbi.nlm.nih.gov/21826525","citation_count":14,"is_preprint":false},{"pmid":"29534146","id":"PMC_29534146","title":"PKC inhibition of sotrastaurin has antitumor activity in diffuse large B-cell lymphoma via regulating the expression of MCT-1.","date":"2018","source":"Acta biochimica et biophysica Sinica","url":"https://pubmed.ncbi.nlm.nih.gov/29534146","citation_count":14,"is_preprint":false},{"pmid":"30815525","id":"PMC_30815525","title":"Translatome and transcriptome analysis of TMA20 (MCT-1) and TMA64 (eIF2D) knockout yeast strains.","date":"2019","source":"Data in brief","url":"https://pubmed.ncbi.nlm.nih.gov/30815525","citation_count":13,"is_preprint":false},{"pmid":"17878526","id":"PMC_17878526","title":"Post-transcriptional control of the MCT-1-associated protein DENR/DRP by RNA-binding protein AUF1.","date":"2007","source":"Cancer genomics & proteomics","url":"https://pubmed.ncbi.nlm.nih.gov/17878526","citation_count":12,"is_preprint":false},{"pmid":"19148494","id":"PMC_19148494","title":"The anti-leukemic effect of a novel histone deacetylase inhibitor MCT-1 and 5-aza-cytidine involves augmentation of Nur77 and inhibition of MMP-9 expression.","date":"2009","source":"International journal of oncology","url":"https://pubmed.ncbi.nlm.nih.gov/19148494","citation_count":12,"is_preprint":false},{"pmid":"11709712","id":"PMC_11709712","title":"Expression and stabilization of the MCT-1 protein by DNA damaging agents.","date":"2001","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/11709712","citation_count":11,"is_preprint":false},{"pmid":"32606753","id":"PMC_32606753","title":"MCTS1 Directly Binds to TWF1 and Synergistically Modulate Cyclin D1 and C-Myc Translation in Luminal A/B Breast Cancer Cells.","date":"2020","source":"OncoTargets and therapy","url":"https://pubmed.ncbi.nlm.nih.gov/32606753","citation_count":10,"is_preprint":false},{"pmid":"39915293","id":"PMC_39915293","title":"Focal adhesion kinase promotes aerobic glycolysis in hepatic stellate cells via the cyclin D1/c-Myc/MCT-1 pathway to induce liver fibrosis.","date":"2025","source":"Scientific reports","url":"https://pubmed.ncbi.nlm.nih.gov/39915293","citation_count":10,"is_preprint":false},{"pmid":"38433101","id":"PMC_38433101","title":"To initiate or not to initiate: A critical assessment of eIF2A, eIF2D, and MCT-1·DENR to deliver initiator tRNA to ribosomes.","date":"2024","source":"Wiley interdisciplinary reviews. RNA","url":"https://pubmed.ncbi.nlm.nih.gov/38433101","citation_count":10,"is_preprint":false},{"pmid":"22336915","id":"PMC_22336915","title":"The involvement of MCT-1 oncoprotein in inducing mitotic catastrophe and nuclear abnormalities.","date":"2012","source":"Cell cycle (Georgetown, Tex.)","url":"https://pubmed.ncbi.nlm.nih.gov/22336915","citation_count":10,"is_preprint":false},{"pmid":"25844530","id":"PMC_25844530","title":"Endurance training alters basal erythrocyte MCT-1 contents and affects the lactate distribution between plasma and red blood cells in T2DM men following maximal exercise.","date":"2015","source":"Canadian journal of physiology and pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/25844530","citation_count":10,"is_preprint":false},{"pmid":"38484814","id":"PMC_38484814","title":"Monocarboxylate transporter-1 (MCT-1) inhibitors screened from autodisplayed FV-antibody library.","date":"2024","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/38484814","citation_count":9,"is_preprint":false},{"pmid":"34079590","id":"PMC_34079590","title":"MCTS1 promotes the development of lung adenocarcinoma by regulating E2F1 expression.","date":"2021","source":"Oncology letters","url":"https://pubmed.ncbi.nlm.nih.gov/34079590","citation_count":9,"is_preprint":false},{"pmid":"37634410","id":"PMC_37634410","title":"MCTS1 enhances the proliferation of laryngeal squamous cell carcinoma via promoting OTUD6B-1 mediated LIN28B deubiquitination.","date":"2023","source":"Biochemical and biophysical research communications","url":"https://pubmed.ncbi.nlm.nih.gov/37634410","citation_count":8,"is_preprint":false},{"pmid":"30391286","id":"PMC_30391286","title":"Cytotoxic action of acetate on tumor cells of thymic origin: Role of MCT-1, pH homeostasis and altered cell survival regulation.","date":"2018","source":"Biochimie","url":"https://pubmed.ncbi.nlm.nih.gov/30391286","citation_count":8,"is_preprint":false},{"pmid":"20598330","id":"PMC_20598330","title":"Effects of age and concentrate feeding on the expression of MCT 1 and CD147 in the gastrointestinal tract of goats and Hereford finishing beef bulls.","date":"2010","source":"Research in veterinary science","url":"https://pubmed.ncbi.nlm.nih.gov/20598330","citation_count":8,"is_preprint":false},{"pmid":"35274760","id":"PMC_35274760","title":"MCTS1 promotes laryngeal squamous cell carcinoma cell growth via enhancing LARP7 stability.","date":"2022","source":"Clinical and experimental pharmacology & physiology","url":"https://pubmed.ncbi.nlm.nih.gov/35274760","citation_count":7,"is_preprint":false},{"pmid":"34277797","id":"PMC_34277797","title":"MCTS1 promotes invasion and metastasis of oral cancer by modifying the EMT process.","date":"2021","source":"Annals of translational medicine","url":"https://pubmed.ncbi.nlm.nih.gov/34277797","citation_count":7,"is_preprint":false},{"pmid":"31891569","id":"PMC_31891569","title":"Multiple Copies in T-Cell Malignancy 1 (MCT-1) Promotes the Stemness of Non-Small Cell Lung Cancer Cells via Activating Interleukin-6 (IL-6) Signaling through Suppressing MiR-34a Expression.","date":"2019","source":"Medical science monitor : international medical journal of experimental and clinical research","url":"https://pubmed.ncbi.nlm.nih.gov/31891569","citation_count":7,"is_preprint":false},{"pmid":"34377560","id":"PMC_34377560","title":"The Role of the MCTS1 and DENR Proteins in Regulating the Mechanisms Associated with Malignant Cell Transformation.","date":"2021","source":"Acta naturae","url":"https://pubmed.ncbi.nlm.nih.gov/34377560","citation_count":6,"is_preprint":false},{"pmid":"23645982","id":"PMC_23645982","title":"The oncogene mcts1.","date":"2007","source":"Translational oncogenomics","url":"https://pubmed.ncbi.nlm.nih.gov/23645982","citation_count":4,"is_preprint":false},{"pmid":"16815567","id":"PMC_16815567","title":"Characterization of the MCT-1 pseudogene: identification and implication of its location in a highly amplified region of chromosome 20.","date":"2006","source":"Biochimica et biophysica acta","url":"https://pubmed.ncbi.nlm.nih.gov/16815567","citation_count":3,"is_preprint":false},{"pmid":"33753742","id":"PMC_33753742","title":"The oncogene Mct-1 promotes progression of hepatocellular carcinoma via enhancement of Yap-mediated cell proliferation.","date":"2021","source":"Cell death discovery","url":"https://pubmed.ncbi.nlm.nih.gov/33753742","citation_count":2,"is_preprint":false},{"pmid":"12938157","id":"PMC_12938157","title":"Identification and characterization of a novel enhancer for the human MCT-1 oncogene promoter.","date":"2003","source":"Journal of cellular biochemistry","url":"https://pubmed.ncbi.nlm.nih.gov/12938157","citation_count":2,"is_preprint":false},{"pmid":"20076993","id":"PMC_20076993","title":"Expression and purification of recombinant human MCT-1 oncogene in insect cells.","date":"2010","source":"The protein journal","url":"https://pubmed.ncbi.nlm.nih.gov/20076993","citation_count":1,"is_preprint":false},{"pmid":"40222337","id":"PMC_40222337","title":"circHIPK2 promotes malignant progression of laryngeal squamous cell carcinoma through the miR-889-3p/MCTS1/IL-6 axis.","date":"2025","source":"Translational oncology","url":"https://pubmed.ncbi.nlm.nih.gov/40222337","citation_count":1,"is_preprint":false},{"pmid":"41623352","id":"PMC_41623352","title":"Complete and partial forms of X-linked MCTS1 deficiency in patients with mycobacterial disease.","date":"2026","source":"Journal of human immunity","url":"https://pubmed.ncbi.nlm.nih.gov/41623352","citation_count":1,"is_preprint":false},{"pmid":"29774995","id":"PMC_29774995","title":"[Study on the relationship between MCT-1 and p53 in laryngeal squamous cell carcinoma].","date":"2017","source":"Lin chuang er bi yan hou tou jing wai ke za zhi = Journal of clinical otorhinolaryngology head and neck surgery","url":"https://pubmed.ncbi.nlm.nih.gov/29774995","citation_count":1,"is_preprint":false},{"pmid":"41050328","id":"PMC_41050328","title":"Aberrant expression of MAPK1 and MCTS1 in chronic myeloid leukemia (CML).","date":"2025","source":"microPublication biology","url":"https://pubmed.ncbi.nlm.nih.gov/41050328","citation_count":0,"is_preprint":false},{"pmid":"42177282","id":"PMC_42177282","title":"Lactic acid induces dendritic cell pyroptosis through MCT-1 to promote tumor immune evasion.","date":"2026","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/42177282","citation_count":0,"is_preprint":false},{"pmid":null,"id":"bio_10.1101_2025.01.31.635924","title":"<i>Enterococcus faecalis</i>  -derived lactic acid suppresses macrophage activation to facilitate persistent and polymicrobial wound infections","date":"2025-01-31","source":"bioRxiv","url":"https://doi.org/10.1101/2025.01.31.635924","citation_count":0,"is_preprint":true},{"pmid":null,"id":"bio_10.1101_2024.08.08.607157","title":"Pyruvate from bone marrow mesenchymal stem cells supports myeloma redox homeostasis and anabolism","date":"2024-08-09","source":"bioRxiv","url":"https://doi.org/10.1101/2024.08.08.607157","citation_count":0,"is_preprint":true}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":34710,"output_tokens":7612,"usd":0.109155,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16917,"output_tokens":6117,"usd":0.118755,"stage2_stop_reason":"end_turn"},"total_usd":0.22791,"stage1_batch_id":"msgbatch_01BbTCMyrRPyhtEq6b1MdwCN","stage2_batch_id":"msgbatch_011dEed5bbxYvTAaQWKJevxu","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1998,\n      \"finding\": \"MCT-1 (MCTS1) is a novel oncogene localized to chromosome Xq22-24 that, when overexpressed in NIH3T3 fibroblasts, shortens G1 phase and promotes anchorage-independent growth. Amino acid homology to a protein-protein binding domain of cyclin H was identified, suggesting a role in cell cycle regulation.\",\n      \"method\": \"AP-PCR genomic amplification assay, FISH mapping, overexpression in NIH3T3 cells with proliferation and soft agar colony assays\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — defined cellular phenotype (G1 shortening, transformation) via overexpression, single lab with multiple assays\",\n      \"pmids\": [\"9766643\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Overexpression of MCT-1 in NIH3T3 fibroblasts increases cdk4 and cdk6 kinase activity, elevates cyclin D1 protein levels, and enhances G1 cyclin/cdk complex formation, establishing a mechanistic link between MCT-1 and G1 phase cell cycle checkpoint deregulation.\",\n      \"method\": \"Kinase activity assays, Western blotting, immunoprecipitation in MCT-1-overexpressing NIH3T3 cells\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — kinase activity assays and co-IP, single lab, two orthogonal methods\",\n      \"pmids\": [\"10440924\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"MCT-1 protein is stabilized in response to DNA damaging agents (gamma irradiation) without requiring new protein synthesis, indicating post-translational stabilization. MCT-1 protein is constitutively cytoplasmic throughout the cell cycle in human lymphoid tumor cells.\",\n      \"method\": \"Western blotting after irradiation with and without protein synthesis inhibitors; subcellular fractionation and immunofluorescence\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — protein stability and localization established by direct biochemical assays, single lab, two orthogonal methods\",\n      \"pmids\": [\"11709712\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The MCT-1 promoter contains a TATA-less region with a consensus initiator element and two Sp1 sites for basal transcription. A positive cis-acting enhancer element at -133 to -122 was identified that binds a lymphoid-specific factor (LMBF, ~96 kDa), and this element functions as an enhancer in reverse orientation.\",\n      \"method\": \"Luciferase reporter assays, electrophoretic mobility shift assay (EMSA), Southwestern blot, deletion analysis of the MCT-1 promoter\",\n      \"journal\": \"Journal of cellular biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct promoter reporter and EMSA assays, single lab, multiple orthogonal methods\",\n      \"pmids\": [\"12938157\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"MCT-1 overexpression deregulates cell cycle checkpoints: it enhances phosphorylation of H2AX and NBS1, increases DNA damage-induced gamma-H2AX and 53BP1 foci, preferentially increases S-phase population after gamma-irradiation, and causes a G1/S checkpoint defect. MCT-1 also transforms immortalized human mammary epithelial cells and promotes genomic instability. Knockdown of MCT-1 via siRNA attenuates H2AX phosphorylation and the checkpoint defect.\",\n      \"method\": \"siRNA knockdown, overexpression, flow cytometry, immunofluorescence for gamma-H2AX and 53BP1 foci, Western blotting for checkpoint proteins\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal gain/loss-of-function with specific molecular readouts, multiple orthogonal methods\",\n      \"pmids\": [\"15897892\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MCT-1 protein interacts with the mRNA cap complex through its PUA domain and recruits DENR (DRP), a protein containing the SUI1 translation initiation domain. MCT-1 upregulation modulates the translational profiles (polysome association) of BCL2L2, TFDP1, MRE11A, cyclin D1, and E2F1 mRNAs without changing total cytoplasmic mRNA levels.\",\n      \"method\": \"Co-immunoprecipitation with cap complex, PUA domain mutant analysis, polysome fractionation with microarray analysis of polysome-associated mRNAs\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — cap complex pull-down with PUA domain mutagenesis, polysome profiling with microarray, multiple orthogonal methods in one study\",\n      \"pmids\": [\"16982740\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"MCT-1 protein is phosphorylated by p44/p42 MAPK (ERK1/2), and this phosphorylation is critical for MCT-1 protein stabilization and its ability to promote cell proliferation. Both genetic (dominant-negative MEK) and pharmacological (MEK/ERK inhibitors) approaches demonstrated that blocking ERK activity reduces MCT-1 phosphorylation and stability.\",\n      \"method\": \"Pharmacological and genetic inhibition of MEK/ERK, Western blotting for MCT-1 phosphorylation and protein stability, proliferation assays\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — combination of genetic and pharmacological approaches establishing kinase-substrate relationship, multiple orthogonal methods\",\n      \"pmids\": [\"17016429\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Forced induction of MCT-1 decreases p53 expression before and after genomic insults by promoting ubiquitin-dependent proteosomal degradation of p53 (increased ubiquitinated-p53 and phospho-MDM2 levels). MCT-1 also enhances ERK1/ERK2 phosphorylation, and MEK/ERK inhibition or MCT-1 knockdown elevates genotoxin-induced p53 and p21 production. MCT-1 overexpression relaxes S-phase and G2/M checkpoints and causes nuclear MCT-1 redistribution upon genotoxic stress coinciding with gamma-H2AX foci.\",\n      \"method\": \"Overexpression and knockdown of MCT-1, proteasome inhibitor treatment, Western blotting, flow cytometry, alkaline comet assay, spectral karyotyping, immunofluorescence\",\n      \"journal\": \"DNA repair\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple mechanistic readouts (proteasome pathway, checkpoint analysis, karyotyping), multiple orthogonal methods, single lab\",\n      \"pmids\": [\"17416211\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"A PUA-domain mutant of MCT-1 expressed in human lymphoma cell lines reduces anchorage-independent growth, increases susceptibility to apoptosis, and alters the translational profile of target mRNAs, confirming that the PUA domain is required for MCT-1's oncogenic translational regulatory function.\",\n      \"method\": \"PUA-domain mutant overexpression, soft agar colony assay, apoptosis assay, polysome fractionation and translational profile analysis\",\n      \"journal\": \"Leukemia research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — domain mutagenesis with functional cellular and translational phenotype readouts, single lab\",\n      \"pmids\": [\"18824261\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MCT-1 is phosphorylated and upregulated by extracellular signal-regulated kinase (ERK); pharmacological ERK inhibition disrupts MCT-1 phosphorylation and stability. MCT-1 knockdown by shRNA in DLBCL cells induces apoptosis. A functional molecular interaction between MCT-1 and the MEK/ERK signaling pathway is established.\",\n      \"method\": \"shRNA knockdown, ERK inhibitor treatment, Western blotting for MCT-1 phosphorylation, apoptosis assays, in vivo DLBCL xenograft model\",\n      \"journal\": \"Cancer research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — shRNA knockdown + pharmacological inhibition + in vivo xenograft, multiple orthogonal methods establishing ERK-MCT-1 functional interaction\",\n      \"pmids\": [\"19789340\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"MCT-1 overexpression accelerates p53 degradation via the ubiquitin-proteasome pathway. In p53-deficient cells, MCT-1 further increases chromosomal translocations, deregulates G2/M checkpoint, promotes chromosome copy number gain, multinucleation, and cytokinesis failure, and amplifies Ras-MEK-ERK signaling and metastatic molecule expression. Loss of p53 and MCT-1 overexpression synergistically promote tumorigenesis.\",\n      \"method\": \"Overexpression in p53-deficient and p53-proficient cells, chromosome analysis, flow cytometry for cell cycle, migration/adhesion assays, xenograft tumorigenicity assays\",\n      \"journal\": \"Molecular cancer research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis between MCT-1 and p53, multiple phenotypic readouts, single lab\",\n      \"pmids\": [\"19372582\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MCT-1 is a novel target gene of p53 transcriptional regulation: wild-type p53 (but not mutant p53) suppresses MCT-1 promoter activity and MCT-1 mRNA stability. In a negative feedback loop, constitutively expressed MCT-1 decreases p53 promoter function and p53 mRNA stability. MDM2, Pirh2, and Cop1 (inhibitors of p53) are stimulated by MCT-1 oncoprotein.\",\n      \"method\": \"Promoter luciferase reporter assays, mRNA stability assays, Western blotting, p53 response element analysis, ChIP-like functional assays\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter assays and mRNA stability measurement, mutual regulation established, single lab\",\n      \"pmids\": [\"21138557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MCT-1 is a centrosomal oncoprotein involved in mitosis. Knockdown of MCT-1 causes intercellular bridging, chromosome mis-congregation, cytokinesis delay, and mitotic death. MCT-1 overexpression in p53-deficient cells deregulates mitotic checkpoint kinases and proteins, increasing cytokinesis failure, multinucleation, centrosome amplification, polyploidy, and aneuploidy.\",\n      \"method\": \"shRNA knockdown, overexpression, immunofluorescence for centrosome markers, flow cytometry for ploidy, time-lapse microscopy of mitotic progression\",\n      \"journal\": \"Cell cycle\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — loss-of-function and gain-of-function with specific mitotic phenotype readouts, single lab\",\n      \"pmids\": [\"22336915\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"MCT-1 acts as a novel regulator of Shc-Ras-MEK-ERK signaling. Knockdown of MCT-1 enhances apoptotic cell death with caspase activation and suppresses cancer cell proliferation, chemo-resistance and tumorigenic capacity.\",\n      \"method\": \"Shc pathway activity measurement, MCT-1 knockdown, caspase activity assays, xenograft tumor assays\",\n      \"journal\": \"Oncotarget\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockdown with defined signaling readouts, single lab\",\n      \"pmids\": [\"23211466\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"DENR and MCT-1 are the first identified selective regulators of eukaryotic translation re-initiation. mRNAs containing upstream ORFs with strong Kozak sequences (stuORFs) selectively require DENR-MCT-1 for their translation. Loss of DENR or MCT-1 in Drosophila impairs tissue growth by reducing translation of a specific class of mRNAs enriched for regulatory proteins including oncogenic kinases.\",\n      \"method\": \"Genetic knockdown of DENR and MCT-1 in Drosophila, polysome profiling, reporter assays for uORF-containing mRNA translation, rescue experiments, tissue growth phenotype analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — genetic loss-of-function in vivo, polysome profiling, reporter assays, multiple orthogonal methods; replicated concept in subsequent papers\",\n      \"pmids\": [\"25043021\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"MCT-1 overexpression antagonizes PTEN gene presentation, protein stability, and functional activity, further promoting PI3K/AKT signaling. In PTEN-null cancer cells, MCT-1 interacts with p190B and Src in vivo. MCT-1 overexpression and PTEN loss synergistically augment Src/p190B signaling, inhibit RhoA activity, and drive neoplastic multinucleation via spindle multipolarity and cytokinesis failure.\",\n      \"method\": \"Co-immunoprecipitation (MCT-1 with p190B and Src), shRNA knockdown, PTEN activity assays, RhoA activity assay, xenograft tumorigenicity assay, immunofluorescence\",\n      \"journal\": \"Oncogene\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP establishing complex, shRNA knockdown with specific signaling readouts, single lab\",\n      \"pmids\": [\"24858043\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Crystal structure of the human small ribosomal subunit in complex with DENR-MCT-1 was determined. The structure reveals that DENR-MCT-1 binds the 40S subunit and the C-terminal domain of DENR occupies a position with striking similarity to canonical eIF1, which controls fidelity of translation initiation and scanning, providing a mechanistic basis for DENR-MCT-1 function in translation initiation and reinitiation.\",\n      \"method\": \"X-ray crystallography of human 40S ribosomal subunit in complex with DENR-MCT-1\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with direct functional implications, rigorous structural biology\",\n      \"pmids\": [\"28723557\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"In human cells, transcripts with short upstream ORFs (stuORFs) of only 1 amino acid are selectively dependent on DENR and MCTS1 for optimal translation, identifying ~100 putative DENR/MCTS1 translational targets enriched for neuronal genes and G protein-coupled receptors.\",\n      \"method\": \"siRNA knockdown of DENR and MCTS1 in human cells, polysome profiling, reporter assays with stuORF-containing mRNAs\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockdown with polysome profiling and reporter assays, single lab\",\n      \"pmids\": [\"28623304\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"MCT-1 activation promotes YY1-EGFR-MnSOD signaling: MCT-1 overexpression suppresses p53 accumulation, elevates MnSOD via the YY1-EGFR signaling cascade, generates intracellular ROS and mitochondrial superoxide, and protects cells against oxidative damage. MCT-1 overexpression in lung cancer cells promotes tumor progression and increases tumor-associated M2 macrophages and cancer-associated fibroblasts.\",\n      \"method\": \"Overexpression and knockdown, Western blotting, ROS measurement, EGFR inhibition, in vivo lung tumor xenograft model\",\n      \"journal\": \"Oncogenesis\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain/loss-of-function with specific signaling pathway readouts, single lab\",\n      \"pmids\": [\"28394354\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of the human DENR-MCT-1 heterodimer was determined at 2.0-Å resolution. Four conserved cysteine residues of DENR (C34, C37, C44, C53) form a tetrahedral zinc ion-binding site essential for preserving DENR's MCT-1-binding interface; substitution of all four cysteines with alanine abolished heterodimer formation.\",\n      \"method\": \"X-ray crystallography, site-directed mutagenesis of zinc-coordinating cysteines, biochemical heterodimer formation assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenesis validation in the same study\",\n      \"pmids\": [\"30584092\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Crystal structure of MCTS1 bound to a fragment of DENR was determined. DENR residues Glu42, Tyr43, and Tyr46 are required for MCTS1 binding; MCTS1 residue Phe104 is required for tRNA binding. DENR-MCTS1 dimerization and tRNA binding are both necessary for the complex to promote translation reinitiation in human cells. The DENR-MCTS1 complex can bind tRNA in the absence of the ribosome, suggesting it recruits tRNA analogously to eIF2 in cap-dependent translation.\",\n      \"method\": \"Crystal structure of DENR-MCTS1, site-directed mutagenesis (DENR E42A/Y43A/Y46A and MCTS1 F104A), tRNA binding assays, reinitiation reporter assays in human cells\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and functional reinitiation assays validating individual residues\",\n      \"pmids\": [\"29889857\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Tma20 (MCT-1), Tma22 (DENR), and Tma64 (eIF2D) function as 40S ribosomal subunit recycling factors in vivo in yeast. Deletion of these genes causes 80S ribosomes to queue behind stop codons (block in 40S recycling), with unrecycled ribosomes able to reinitiate at AUG codons in the 3' UTR. The Tma20/Tma22 (MCT-1/DENR) pathway promotes 40S recycling and can lead to 80S reinitiation in 3' UTRs.\",\n      \"method\": \"Ribosome profiling (Ribo-seq) of yeast deletion strains, 3' UTR reporter assays, in vitro translation with uORF-containing mRNAs\",\n      \"journal\": \"Molecular cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — ribosome profiling of knockouts with direct stop-codon queuing evidence plus reporter assay validation\",\n      \"pmids\": [\"30146315\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"MCT-1 stimulates IL-6 secretion, which promotes monocytic THP-1 polarization into M2-like macrophages and increases TNBC cell invasiveness. MCT-1 elevates soluble IL-6 receptor levels. MCT-1 knockdown induces miR-34a, which inhibits IL-6R expression and activates M1 polarization. MCT-1 increases breast cancer stem cell features further advanced by IL-6 but prevented by tocilizumab (IL-6R antibody).\",\n      \"method\": \"MCT-1 overexpression and shRNA knockdown, IL-6 ELISA, macrophage polarization assays, miR-34a measurement, tocilizumab treatment, invasion assays, xenograft mouse model\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple gain/loss-of-function experiments with mechanistic pathway readouts, antibody blocking, in vivo validation\",\n      \"pmids\": [\"30885232\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"MCTS1 directly binds to TWF1 (twinfilin-1) and this interaction synergistically modulates cyclin D1 and C-Myc translation in luminal A/B breast cancer cells (BT-474 and MCF-7).\",\n      \"method\": \"Co-immunoprecipitation (direct binding), Western blotting for cyclin D1 and C-Myc protein levels upon MCTS1 modulation\",\n      \"journal\": \"OncoTargets and therapy\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP, single lab, limited mechanistic follow-up on the interaction\",\n      \"pmids\": [\"32606753\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"40S ribosome footprinting directly demonstrated that deletion of TMA20 (MCT-1) and TMA22 (DENR) genes in yeast causes broad accumulation of unrecycled 40S subunits at stop codons. The Tma20/Tma22 heterodimer is responsible for the majority of 40S recycling events while Tma64 (eIF2D) plays a minor role. An autism-associated mutation in TMA22 abolishes 40S recycling activity.\",\n      \"method\": \"40S-specific ribosome footprinting in yeast deletion strains, TMA22 autism mutation analysis\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — direct 40S footprinting method showing stop-codon accumulation in knockouts; orthogonal to ribosome profiling; autism mutation further validates functional importance\",\n      \"pmids\": [\"34016977\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"MCTS1 interacts with LARP7 via Co-IP (mainly in the cytoplasm), increases LARP7 protein half-life, and reduces LARP7 poly-ubiquitination, thereby enhancing LSCC cell viability and cell cycle progression (CDK1, CDK2, cyclin A2, cyclin B1). LARP7 overexpression partly reversed the effects of MCTS1 knockdown.\",\n      \"method\": \"Co-immunoprecipitation, cycloheximide chase assay, ubiquitination Co-IP assay, knockdown/overexpression with cell cycle marker Western blotting\",\n      \"journal\": \"Clinical and experimental pharmacology & physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with CHX chase and ubiquitination assay, multiple orthogonal methods, single lab\",\n      \"pmids\": [\"35274760\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"MCTS1 interacts with OTUD6B isoform 1 (OTUD6B-1) in laryngeal squamous cell carcinoma cells, and MCTS1 negatively modulates LIN28B degradation by enhancing OTUD6B-1-mediated cleavage of K48-branched ubiquitin chains from LIN28B, thereby stabilizing LIN28B and promoting cyclin D1, cyclin E1, and c-Myc expression.\",\n      \"method\": \"Co-immunoprecipitation (MCTS1-OTUD6B-1 interaction), ubiquitination assays (K48-branched chains), shRNA knockdown, in vitro and in vivo proliferation assays\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with specific ubiquitin chain analysis, single lab, two orthogonal methods\",\n      \"pmids\": [\"37634410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Complete MCTS1 deficiency in humans impairs translation re-initiation of a subset of proteins including JAK2 in all cell types tested (T lymphocytes and phagocytes). Reduced JAK2 expression impairs cellular responses to IL-23 and partially IL-12, but not other JAK2-dependent cytokines. Defective IL-23 responses preferentially impair IFN-γ production by MAIT cells and γδ T lymphocytes upon mycobacterial challenge, causing Mendelian susceptibility to mycobacterial disease.\",\n      \"method\": \"Genetic analysis of MCTS1-deficient patients, Western blotting for JAK2 in multiple cell types, functional assays of cytokine signaling (IL-23, IL-12 responses), IFN-γ production assays upon mycobacterial stimulation\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — human genetic disease model with direct biochemical validation (JAK2 protein levels), functional cytokine signaling assays, multiple cell types, replicated across multiple families\",\n      \"pmids\": [\"37875108\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"MCT-1 promoter activity is suppressed by wild-type p53 (containing p53 response elements in the promoter region), while constitutive MCT-1 expression decreases p53 promoter function and p53 mRNA stability, establishing a mutual negative feedback loop at the transcriptional level.\",\n      \"method\": \"Luciferase reporter assays with MCT-1 promoter containing p53 response elements, mRNA stability assays, ChIP-type analysis\",\n      \"journal\": \"Molecular cancer\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — promoter reporter assays with response element mapping and mRNA stability assays, single lab\",\n      \"pmids\": [\"21138557\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"MCTS1 (MCT-1) is a PUA-domain-containing oncogenic protein that forms a heterodimer with DENR (stabilized by a zinc-binding site in DENR), binds the 40S ribosomal subunit (structurally characterized by X-ray crystallography), and functions as a selective regulator of translation re-initiation and 40S subunit recycling at stop codons, particularly for mRNAs with short upstream ORFs of strong Kozak context; at the cellular level, MCT-1 is phosphorylated and stabilized by ERK1/2, downregulates p53 via ubiquitin-proteasome-mediated degradation, deregulates G1 cyclin/CDK activity and DNA damage checkpoints to promote cell cycle progression, activates Shc-Ras-MEK-ERK and PI3K/AKT survival signaling, and drives IL-6/IL-6R-mediated tumor microenvironment remodeling; in humans, complete MCTS1 deficiency specifically impairs JAK2 translation, reducing IL-23 responsiveness and IFN-γ production by innate-like T cells, causing susceptibility to mycobacterial disease.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"MCTS1 (MCT-1) is a PUA-domain-containing translational regulator and oncoprotein that, together with its obligate heterodimeric partner DENR, controls the recycling of the small (40S) ribosomal subunit at stop codons and the re-initiation of translation on transcripts bearing short upstream ORFs [#5, #14, #21]. Structural work places the DENR-MCT-1 heterodimer on the 40S subunit with DENR's C-terminal domain occupying a position resembling eIF1, and shows that heterodimer integrity depends on a tetrahedral zinc site formed by four conserved DENR cysteines while the MCTS1 surface (residue Phe104) mediates tRNA binding required for re-initiation [#16, #19, #20]. Loss-of-function studies across Drosophila, yeast and human cells establish that this complex selectively governs translation of stuORF-containing mRNAs enriched for regulatory proteins and is responsible for the bulk of 40S recycling events, with unrecycled ribosomes queuing behind stop codons in its absence [#14, #21, #24]. In its oncogenic capacity, MCT-1 is phosphorylated and stabilized by ERK1/2 and shortens G1 phase by elevating cyclin D1 and CDK4/6 activity [#1, #6], remodels translational profiles of growth-regulatory mRNAs through its PUA domain [#5, #8], and drives genomic instability via deregulation of DNA-damage and mitotic checkpoints [#4, #12]. MCT-1 antagonizes p53 by promoting its ubiquitin-proteasome-mediated degradation within a mutual negative-feedback loop and amplifies Shc-Ras-MEK-ERK and PI3K/AKT survival signaling, while also reshaping the tumor microenvironment through IL-6/IL-6R signaling [#7, #11, #13, #15, #22]. In humans, complete MCTS1 deficiency selectively impairs re-initiation of JAK2, reducing IL-23 responsiveness and IFN-\\u03b3 production by innate-like T cells and causing Mendelian susceptibility to mycobacterial disease [#27].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established MCTS1 as a candidate oncogene by showing its overexpression shortens G1 and confers anchorage-independent growth, framing it as a cell-cycle-linked transforming protein.\",\n      \"evidence\": \"Genomic amplification mapping plus overexpression and soft-agar assays in NIH3T3 fibroblasts\",\n      \"pmids\": [\"9766643\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular activity undefined\", \"No endogenous loss-of-function\", \"Cyclin H homology inferred, not functionally tested\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Connected MCT-1 to a specific G1 checkpoint mechanism by showing it elevates cyclin D1 and CDK4/6 activity, moving beyond a phenotypic to a molecular link.\",\n      \"evidence\": \"Kinase activity assays and co-IP in MCT-1-overexpressing NIH3T3 cells\",\n      \"pmids\": [\"10440924\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which MCT-1 raises cyclin D1 not determined\", \"Overexpression-only\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Showed MCT-1 is post-translationally stabilized after DNA damage and is constitutively cytoplasmic, indicating regulation at the protein rather than transcript level.\",\n      \"evidence\": \"Western blotting with protein-synthesis inhibitors and subcellular fractionation in lymphoid tumor cells\",\n      \"pmids\": [\"11709712\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stabilizing modification/enzyme not identified\", \"Functional consequence of damage stabilization unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Defined the transcriptional control of MCTS1 itself, identifying a TATA-less promoter with Sp1 sites and a lymphoid-specific enhancer.\",\n      \"evidence\": \"Luciferase reporters, EMSA and Southwestern blot of the MCT-1 promoter\",\n      \"pmids\": [\"12938157\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"LMBF factor not molecularly identified\", \"Promoter regulation in non-lymphoid contexts untested\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated reciprocally (gain and loss of function) that MCT-1 deregulates the G1/S DNA-damage checkpoint and drives genomic instability and epithelial transformation.\",\n      \"evidence\": \"siRNA and overexpression with gamma-H2AX/53BP1 foci, flow cytometry and Western blotting in human epithelial cells\",\n      \"pmids\": [\"15897892\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct molecular target linking MCT-1 to checkpoint proteins not established\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified the molecular activity of MCTS1: its PUA domain engages the mRNA cap complex and recruits the SUI1-domain protein DENR, linking MCT-1 to selective translational regulation of growth mRNAs.\",\n      \"evidence\": \"Cap-complex co-IP with PUA-domain mutants and polysome profiling with microarray\",\n      \"pmids\": [\"16982740\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of mRNA selectivity unresolved at this stage\", \"Cap-binding mode not structurally defined\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Placed MCT-1 downstream of MEK/ERK by showing ERK1/2 phosphorylation stabilizes the protein and is required for its proliferative function, defining an upstream regulatory kinase.\",\n      \"evidence\": \"Genetic (dominant-negative MEK) and pharmacological ERK inhibition with phospho/stability Westerns and proliferation assays\",\n      \"pmids\": [\"17016429\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct phosphorylation sites not mapped\", \"Whether ERK phosphorylates MCT-1 directly vs indirectly not resolved\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Established that MCT-1 suppresses p53 by promoting its ubiquitin-proteasome degradation and relaxes S/G2-M checkpoints, defining a mechanism for genome-destabilizing oncogenesis.\",\n      \"evidence\": \"Overexpression/knockdown, proteasome inhibition, comet assay, karyotyping and immunofluorescence\",\n      \"pmids\": [\"17416211\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether MCT-1 acts directly on the p53 degradation machinery not shown\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Consolidated the ERK-MCT-1 axis as a survival pathway in lymphoma, showing knockdown induces apoptosis in vitro and reduces tumor growth in vivo.\",\n      \"evidence\": \"shRNA knockdown, ERK inhibition, apoptosis assays and DLBCL xenografts\",\n      \"pmids\": [\"19789340\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Translational targets mediating survival not identified here\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed genetic epistasis with p53: MCT-1 and p53 loss synergize to drive chromosomal instability and Ras-MEK-ERK amplification, defining a cooperative tumorigenic context.\",\n      \"evidence\": \"Overexpression in p53-null vs proficient cells, chromosome analysis, migration and xenograft assays\",\n      \"pmids\": [\"19372582\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab phenotype set\", \"Direct mechanism of synergy not dissected\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Defined a mutual negative-feedback loop in which p53 transcriptionally represses MCTS1 while MCT-1 suppresses p53 promoter function and stimulates p53 inhibitors (MDM2, Pirh2, Cop1).\",\n      \"evidence\": \"Promoter luciferase reporters, mRNA stability assays and response-element analysis\",\n      \"pmids\": [\"21138557\", \"21138557\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct p53 binding to MCTS1 promoter shown functionally but not by definitive ChIP\", \"Loop dynamics in vivo untested\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established the core biological function: DENR-MCT-1 are the first selective regulators of translation re-initiation, required for stuORF-containing mRNAs encoding regulatory proteins and tissue growth.\",\n      \"evidence\": \"Genetic knockdown in Drosophila with polysome profiling, uORF reporters and rescue\",\n      \"pmids\": [\"25043021\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of 40S engagement not yet shown\", \"Mammalian target set not enumerated here\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Linked MCT-1 to PI3K/AKT by showing it antagonizes PTEN and physically associates with Src and p190B, integrating translational and cytoskeletal/survival signaling.\",\n      \"evidence\": \"Co-IP (MCT-1 with Src/p190B), shRNA, PTEN and RhoA activity assays and xenografts\",\n      \"pmids\": [\"24858043\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether Src/p190B binding is direct not established\", \"Single-lab\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Provided the structural mechanism by solving the human 40S-DENR-MCT-1 complex, revealing DENR's eIF1-like positioning that rationalizes its role in initiation fidelity and re-initiation.\",\n      \"evidence\": \"X-ray crystallography of the human 40S subunit with DENR-MCT-1\",\n      \"pmids\": [\"28723557\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"mRNA and tRNA positions not resolved in this structure\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Extended the re-initiation function to human cells, identifying ~100 stuORF-dependent targets enriched for neuronal genes and GPCRs.\",\n      \"evidence\": \"siRNA of DENR/MCTS1 with polysome profiling and stuORF reporters in human cells\",\n      \"pmids\": [\"28623304\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Target list putative\", \"Physiological consequences of neuronal targets not tested\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Resolved heterodimer architecture, showing a DENR zinc site (C34/C37/C44/C53) is essential for the MCT-1-binding interface.\",\n      \"evidence\": \"2.0-\\u00c5 crystal structure with cysteine-to-alanine mutagenesis and dimerization assays\",\n      \"pmids\": [\"30584092\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether zinc-site disruption phenocopies re-initiation loss in cells not shown here\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the residues governing dimerization and tRNA binding (DENR E42/Y43/Y46; MCTS1 F104), and showed the complex binds tRNA ribosome-independently like eIF2, mechanistically explaining re-initiation.\",\n      \"evidence\": \"DENR-MCTS1 crystal structure, mutagenesis, tRNA-binding and reinitiation reporter assays in human cells\",\n      \"pmids\": [\"29889857\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"tRNA species selectivity not characterized\", \"In vivo tRNA delivery step not directly visualized\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Defined the conserved in vivo activity of MCT-1/DENR orthologs as 40S recycling factors, showing knockout causes 80S queuing at stop codons and 3'UTR reinitiation.\",\n      \"evidence\": \"Ribosome profiling of yeast TMA20/TMA22 deletions, 3'UTR reporters and in vitro translation\",\n      \"pmids\": [\"30146315\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution vs eIF2D quantified later\", \"Mammalian recycling not directly measured here\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Quantified recycling activity using 40S-specific footprinting, showing the MCT-1/DENR heterodimer mediates the majority of 40S recycling and that a disease mutation in DENR abolishes it.\",\n      \"evidence\": \"40S ribosome footprinting in yeast deletion strains plus autism-mutation analysis\",\n      \"pmids\": [\"34016977\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism distinguishing recycling from reinitiation outcomes not fully resolved\"]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Identified a deubiquitination-stabilization role in which MCTS1 binds LARP7, extends its half-life and reduces its ubiquitination to drive cell-cycle progression in laryngeal cancer.\",\n      \"evidence\": \"Co-IP, cycloheximide chase and ubiquitination Co-IP with cell-cycle Westerns\",\n      \"pmids\": [\"35274760\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether MCTS1 binding is direct vs complex-mediated unclear\", \"Mechanism linking binding to reduced ubiquitination not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Showed MCTS1 stabilizes the oncofetal regulator LIN28B by enhancing OTUD6B-1-mediated removal of K48 ubiquitin chains, expanding its protein-stabilizing repertoire.\",\n      \"evidence\": \"Co-IP, K48-chain ubiquitination assays, shRNA and proliferation assays in laryngeal carcinoma\",\n      \"pmids\": [\"37634410\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct enzymatic role of MCTS1 in deubiquitination not established\", \"Single tumor type\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Defined the human disease phenotype: complete MCTS1 deficiency selectively impairs JAK2 re-initiation, blunting IL-23 responses and IFN-\\u03b3 production by innate-like T cells, causing Mendelian susceptibility to mycobacterial disease.\",\n      \"evidence\": \"Patient genetics, JAK2 Westerns across cell types, cytokine-signaling and IFN-\\u03b3 assays upon mycobacterial challenge\",\n      \"pmids\": [\"37875108\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Why JAK2 is uniquely sensitive among targets not fully explained\", \"Therapeutic correction untested\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How MCT-1's translational re-initiation/recycling function mechanistically connects to its protein-stabilization (deubiquitination) and oncogenic signaling activities, and how target selectivity (e.g., JAK2) is determined, remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking ribosome recycling to p53/PTEN/LARP7/LIN28B regulation\", \"Determinants of mammalian target selectivity undefined\", \"Direct vs indirect roles in protein stabilization unresolved\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [5, 14, 17, 20, 21, 24]},\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [20]},\n      {\"term_id\": \"GO:0060090\", \"supporting_discovery_ids\": [5, 16, 19, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [2, 25]},\n      {\"term_id\": \"GO:0005840\", \"supporting_discovery_ids\": [16, 21, 24]},\n      {\"term_id\": \"GO:0005815\", \"supporting_discovery_ids\": [12]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-72766\", \"supporting_discovery_ids\": [14, 21, 24]},\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [5, 14, 21, 24]},\n      {\"term_id\": \"R-HSA-1640170\", \"supporting_discovery_ids\": [1, 4, 12]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [6, 13, 15]},\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [27]}\n    ],\n    \"complexes\": [\"DENR-MCTS1 heterodimer\", \"40S ribosomal subunit (DENR-MCT-1 bound)\"],\n    \"partners\": [\"DENR\", \"Src\", \"p190B\", \"TWF1\", \"LARP7\", \"OTUD6B\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}