| 2013 |
MEX3A binds directly to a specific determinant in the CDX2 mRNA 3'UTR and represses CDX2 expression post-transcriptionally, thereby impairing intestinal differentiation, cellular polarization, and promoting expression of intestinal stem cell markers (LGR5, BMI1, MSI1). |
Cell-based assays (RNA-binding to CDX2 mRNA 3'UTR), expression studies in murine intestine, overexpression/knockdown experiments |
Nucleic acids research |
High |
23408853
|
| 2017 |
Mex3a expression marks a slowly cycling, reserve-like subpopulation of Lgr5+ intestinal stem cells (ISCs) that is spared by chemotherapy and radiation (which preferentially target rapidly dividing Lgr5+ cells) and helps regenerate the intestinal epithelium after toxic insults. |
Lineage tracing, single-cell transcriptome profiling, in vivo chemotherapy/radiation challenge models |
Cell stem cell |
High |
28285904
|
| 2020 |
MEX3A binds LAMA2 mRNA via RNA immunoprecipitation and promotes its instability/degradation in lung adenocarcinoma cells, thereby downregulating LAMA2 and activating PI3K/AKT signaling to promote metastasis. |
RNA immunoprecipitation (RIP), mRNA stability assay, knockdown/rescue experiments, transcriptome sequencing |
Cell death & disease |
Medium |
32792503
|
| 2020 |
MEX3A acts as an E3 ubiquitin ligase that binds RIG-I protein and induces its ubiquitylation and proteasome-dependent degradation in glioblastoma cells, suppressing RIG-I tumor suppressor function. |
Co-immunoprecipitation, ubiquitylation assay, proteasome inhibition, MEX3A knockdown with RIG-I protein level readout |
Cancers |
Medium |
32019099
|
| 2020 |
Knockout of Mex3a in mice disrupts Lgr5+ ISC pool maintenance during postnatal intestinal development and impairs organoid maturation ex vivo. Mechanistically, Mex3a deletion induces PPARγ pathway activation with concomitant decrease in Wnt signalling and loss of Lgr5+ stem cell signature; high PPARγ signalling impairs Lgr5+ ISC function. |
Mex3a knockout mouse model, transcriptomic profiling of intestinal crypts, organoid assays, PPARγ pathway manipulation |
EMBO reports |
High |
32052574
|
| 2021 |
MEX3A interacts with RAP1GAP protein (demonstrated by Co-IP) and regulates the RAP1GAP/MEK/ERK/HIF-1α pathway to promote colorectal cancer cell proliferation and metastasis; hsa-miR-6887-3p binds the 3'UTR of MEX3A mRNA to suppress its expression. |
Co-immunoprecipitation (Co-IP), transcriptome analysis, dual-luciferase reporter assay, MEK/ERK inhibitor rescue experiments |
Cancer communications |
Medium |
33638620
|
| 2021 |
The human RNA chaperone MEX3A (hMex3A) binds the Andes orthohantavirus Small mRNA 3'UTR (identified by RNA affinity chromatography/mass spectrometry) and enhances SmRNA translation in a 3'UTR-dependent manner; hMex3A interacts with eIF4G independently of viral infection, suggesting a 5'-3' end interaction mechanism. |
RNA affinity chromatography followed by mass spectrometry, in vitro translation assay, co-immunoprecipitation (hMex3A-eIF4G interaction) |
PLoS pathogens |
Medium |
34547046
|
| 2022 |
MEX3A binds to the MEX3 recognition element (MRE) in MSH2 mRNA 3'UTR and recruits CCR4-NOT complexes to induce MSH2 mRNA deadenylation and degradation, thereby reducing DNA mismatch repair activity and conferring temozolomide resistance in glioblastoma. |
RNA-binding assay (MRE identification), CCR4-NOT complex association assay, mRNA stability/deadenylation assay, MEX3A overexpression/depletion with MMR activity and chemosensitivity readouts |
Cancer research |
High |
36112059
|
| 2022 |
MEX3A overexpression in ovarian cancer cells promotes p53 protein degradation without altering p53 mRNA levels; MEX3A-mediated p53 degradation is critical for suppressing ferroptosis and enhancing tumorigenesis. MEX3A contains a RING finger domain (E3 ubiquitin ligase) and an RNA-binding domain. |
MEX3A depletion/overexpression with p53 protein stability assay, p53 mRNA level measurement (unchanged), ferroptosis assays, orthotopic xenograft models, p53 knockdown rescue experiments |
Cancer research |
High |
36354374
|
| 2022 |
MEX3A promotes ovarian cancer progression by regulating alternative splicing of TIMELESS mRNA: MEX3A knockdown causes retention of intron 23 of TIMELESS mRNA and decreases TIMELESS mRNA through stimulation of nonsense-mediated RNA decay (NMD). |
RNA-seq alternative splicing analysis, MEX3A knockdown with TIMELESS mRNA splicing readout, NMD pathway analysis, TIMELESS overexpression rescue |
Cell death & disease |
Medium |
35715407
|
| 2022 |
MEX3A interacts with DVL3 (a positive Wnt/β-catenin pathway regulator) via co-immunoprecipitation, stabilizes β-catenin, and upregulates downstream Wnt target genes to promote EMT and endometrial carcinoma progression. |
Co-immunoprecipitation (Co-IP), immunofluorescence, GSEA pathway analysis, knockdown/overexpression with β-catenin readout |
International journal of molecular sciences |
Medium |
36614043
|
| 2022 |
E2F3 transcription factor induces MEX3A expression, which in turn directly suppresses KLF4 (a pro-differentiation transcription factor) mRNA expression via RNA crosslinking immunoprecipitation (CLIP), thereby activating WNT pathway and maintaining cancer cells in undifferentiated/proliferative state with enhanced radioresistance. |
RNA CLIP, luciferase reporter assay, Mex3a KO and intestinal epithelium cKO mouse models, AOM-DSS and Apc-floxed tumor models, organoid cultures, RNA-seq |
Theranostics |
High |
36276637
|
| 2022 |
Mex3a+ cells in colorectal cancer are chemoresistant persister cells that downregulate the WNT/stem cell gene program after chemotherapy and adopt a YAP+ fetal intestinal progenitor-like state; Mex3a-deficient cells differentiate toward goblet cell-like phenotype and cannot resist chemotherapy. |
Lineage-tracing analysis in CRC mouse models, patient-derived organoids with chemotherapy, Mex3a-deficient cell characterization |
Nature cancer |
High |
35773527
|
| 2023 |
MEX3A acts as a post-transcriptional regulator in adult murine neural stem cells (NSCs), controlling a quiescence-related RNA signature at critical neurogenic lineage transitions. MEX3A is required for activated NSCs to return to quiescence and for repression of the same stemness program at onset of neuronal differentiation, functioning as a translational remodeller. |
In vivo mouse subependymal zone neurogenesis analysis, MEX3A loss-of-function, transcriptomic profiling, stemness-associated transcript analysis |
Nature communications |
Medium |
36690670
|
| 2023 |
MEX3A binds IGFBP4 mRNA (via RNA pull-down and RIP assay) and decreases IGFBP4 mRNA levels in breast cancer cells, thereby activating PI3K/AKT and downstream cell cycle/migration pathways. |
RNA pull-down assay, RNA immunoprecipitation (RIP), MEX3A knockdown with IGFBP4 mRNA level readout, PI3K/AKT pathway analysis |
Breast cancer research and treatment |
Medium |
37433992
|
| 2023 |
BMAL1 directly activates transcription of Mex3a; MEX3A in turn binds to and stabilizes Lgr5 mRNA to maintain LGR5+ crypt base columnar cell numbers. Bmal1 depletion reduced Mex3a and Lgr5 expression and increased ferroptosis, decreasing LGR5+ CBC numbers. |
Chromatin binding/transcription assays for BMAL1-Mex3a, RNA-binding assay for MEX3A-Lgr5 mRNA, Bmal1 depletion with ferroptosis and cell-number readouts |
Scientific reports |
Medium |
37845346
|
| 2023 |
Activated IGF-1R phosphorylates β-arrestin-2 (βarr2) on Tyr64 and Tyr250, inducing conformational changes that open the middle loop (Leu130-Cys141) of βarr2 to interact with the RING domain of MEX3A, thereby triggering MEX3A-mediated ubiquitination and degradation of RIG-I, suppressing IFN-I antiviral immunity in the tumor microenvironment. |
Structural modeling, mutant analysis (βarr2Y64A, βarr2Y250A), truncated-βarr2 and peptide competition assays, RIG-I degradation assay, Co-IP/complex formation assays |
Acta pharmaceutica Sinica. B |
Medium |
37521868
|
| 2021 |
MEX3A knockdown in clear cell renal cell carcinoma induces G1/S cell cycle arrest. Systematic eCLIP-seq and RIP-seq identified CDKN2B mRNA as a direct MEX3A target: MEX3A binds CDKN2B 3'UTR and promotes its mRNA degradation, leading to decreased CDKN2B and uncontrolled cell cycle progression. MEX3A transcription is activated by ETS1. |
Enhanced cross-linking immunoprecipitation sequencing (eCLIP-seq), RNA-immunoprecipitation sequencing (RIP-seq), G1/S arrest assay, CDKN2B rescue experiments, ETS1 transcriptional activation assay |
Molecular therapy. Nucleic acids |
High |
34976441
|
| 2024 |
MEX3A undergoes intrinsically disordered region (IDR)-dependent liquid-liquid phase separation (LLPS) in the cytoplasm. In complex with circMPP6 (which acts as a scaffold), MEX3A interacts with processing body (PB) proteins to modulate PB dynamics and promote UPF-mediated degradation of PDE5A mRNA, inhibiting autophagy and promoting CRC progression. |
LLPS assay (IDR-dependent), RNA-protein interaction assays (circMPP6-MEX3A), Co-IP with PB proteins, PDE5A mRNA decay assay, autophagy readouts |
Signal transduction and targeted therapy |
Medium |
38565536
|
| 2022 |
SMYD2 epigenetically activates MEX3A expression by promoting H3K36me2 modification on the MEX3A promoter (validated by ChIP-qPCR); MEX3A in turn suppresses CDX2 expression to promote colorectal cancer cell growth. |
Chromatin immunoprecipitation (ChIP)-qPCR, MEX3A overexpression/knockdown with CDX2 readout, rescue experiments |
Clinical and experimental pharmacology & physiology |
Medium |
35637161
|
| 2023 |
MEX3A interacts with CREB1 protein (co-immunoprecipitation implied by 'directly targeting CREB1') in thyroid cancer cells; the MEX3A-CREB1 interaction contributes to tumor-promoting effects, as CREB1 silencing alleviates MEX3A-mediated malignant phenotypes. |
MEX3A depletion with CREB1 interaction assay, CREB1 silencing rescue experiment |
Cell biology international |
Low |
37529875
|
| 2025 |
Mex3a post-transcriptionally silences olfactory receptor (OR) protein expression during the polygenic stage of OR transcription in developing olfactory sensory neurons (OSNs), decoupling OR transcription from OR protein-induced ER stress. Conditional Mex3a deletion causes premature ER stress during polygenic OR transcription, biases OR choice toward first-transcribed OR alleles, and perturbs OR-regulated axon targeting, disrupting the glomerular map in the olfactory bulb. |
Conditional Mex3a deletion in OSNs, ER stress measurement, OR choice analysis, axon targeting/glomerular map analysis |
Cell reports |
High |
40668674
|
| 2026 |
MEX3A directly interacts with PPARG transcripts (identified by HyperTRIBE) and represses PPARγ pathway signaling in intestinal/colorectal cancer cells. Mex3a heterozygous knockout in Apc+/fl and Apc+/fl;Kras+/G12D mouse models reduces tumor burden; MEX3A-depleted patient-derived CRC tumoroids show increased PPARγ, reduced LGR5, and increased sensitivity to FOLFOX chemotherapy. |
HyperTRIBE (RNA target identification), Mex3a heterozygous KO in CRC mouse models, CRISPR/Cas9 MEX3A KO in patient-derived tumoroids, PPARγ pathway and chemotherapy sensitivity assays |
Cellular and molecular gastroenterology and hepatology |
High |
41881339
|
| 2025 |
MEX3A depletion in ovarian clear cell carcinoma (OCCC) cells causes chronic mitochondrial fragmentation, decreased mitochondrial membrane potential, increased superoxide, decreased NAD+/NADH ratio, inhibition of OXPHOS, and decreased ATP levels. In mitophagy-stressor-rich environments (e.g., liver), MEX3A-depleted OCCC cells fail to recover from mitophagy, greatly reducing liver metastasis. This mitochondrial fitness control by MEX3A is independent of p53. |
MEX3A knockdown with mitochondrial morphology imaging, mitochondrial membrane potential assay, superoxide measurement, NAD+/NADH ratio, OXPHOS/ATP assays, mitophagy stress survival assay, in vivo liver metastasis model |
bioRxivpreprint |
Medium |
bio_10.1101_2025.11.05.686880
|
| 2026 |
MEX3A promotes seRNA m6A methylation in breast cancer by interacting with RBM15B (demonstrated by co-immunoprecipitation), forming a MEX3A/RBM15B/IGF2BP3 complex that maintains KMT2C mRNA expression and stability; IGF2BP3 reads seRNA m6A, and KMT2C promotes H3K4me1 formation to drive super-enhancer activity. |
Co-immunoprecipitation (MEX3A-RBM15B), methylated RNA immunoprecipitation (MeRIP) assay, FISH for co-localization, functional proliferation/metastasis assays, in vivo xenograft |
Translational oncology |
Medium |
41161249
|
| 2026 |
Loss of Mex3a in immature olfactory sensory neurons leads to defects in cilia structure, cell surface protein expression, and planar cell polarity in mature OSNs. Proteomics reveal Mex3a-dependent decrease in proteins related to vesicle transport, lipid metabolism, and ribosome biogenesis. Mex3a may confer K27 ubiquitin linkage on substrates including Serbp1 and Rps7. Mex3a levels regulate recruitment of translation factors Serbp1 and p-eEF2 to ribosomes. |
Mex3a loss-of-function in OSNs, proteomics, ubiquitin linkage assay (K27), ribosome recruitment assay for Serbp1 and p-eEF2 |
bioRxivpreprint |
Medium |
41726993
|
| 2022 |
Grass carp Mex3A (ortholog) interacts physically with RIG-I in the endoplasmic reticulum; RING domain deletion mutant retains RIG-I binding but fails to degrade it, establishing that Mex3A acts as a RING-type E3 ubiquitin ligase to ubiquitinate and degrade RIG-I and inhibit IRF3-mediated antiviral innate immune response. |
Co-localization analysis, Co-IP, RING domain truncation/deletion mutant analysis, ubiquitination assay, IRF3 phosphorylation assay |
Frontiers in immunology |
Medium |
35865536
|