| 2023 |
Crystal structure of METTL1-WDR4 and cryo-EM structures of METTL1-WDR4-tRNA revealed that WDR4 serves as a scaffold for METTL1 and the tRNA T-arm; the composite protein surface recognizes the tRNA elbow through shape complementarity. The METTL1 N terminus couples cofactor (SAM) binding with conformational changes in the tRNA, catalytic loop, and WDR4 C terminus, acting as a switch to activate m7G methylation. S27 phosphorylation of the METTL1 N-terminal region inhibits methyltransferase activity by disrupting the catalytic centre. |
X-ray crystallography, cryo-EM, biochemical methyltransferase assays, mutagenesis (S27 phosphorylation site), cellular studies |
Nature |
High |
36599982 36599985
|
| 2023 |
WDR4 serves as a scaffold for METTL1 and the tRNA T-arm. The predicted disordered N-terminal region of METTL1 is part of the catalytic pocket and essential for methyltransferase activity. S27 phosphorylation in the METTL1 N-terminal region inhibits methyltransferase activity by locally disrupting the catalytic centre, providing a phosphorylation-mediated regulatory mechanism for METTL1-WDR4. |
Cryo-EM structure of METTL1-WDR4-tRNA, crystal structures of METTL1, biochemical methyltransferase assays, phospho-mimetic and phospho-dead mutagenesis, cellular assays |
Nature |
High |
36599985
|
| 2015 |
WDR4 is the human ortholog of yeast Trm82, an essential non-catalytic component of the Trm8/Trm82 holoenzyme. A missense mutation in WDR4 (and the corresponding yeast mutation) significantly reduces m7G46 methylation of specific tRNA species, establishing WDR4 as required for tRNA m7G46 modification in humans. |
Autozygome/exome analysis to identify disease mutation; functional validation by measuring m7G46 methylation of tRNA in patient cells and yeast carrying the corresponding mutation |
Genome biology |
High |
26416026
|
| 2018 |
Mettl1 or Wdr4 knockout in mouse embryonic stem cells (mESCs) reduces m7G tRNA modification at a 'RAGGU' motif in the variable loop of a subset of 22 tRNAs, causes increased ribosome occupancy at corresponding codons (ribosome pausing), impairs mRNA translation globally, and results in defective ESC self-renewal and neural differentiation. |
m7G MeRIP-seq (methylated tRNA immunoprecipitation sequencing), TRAC-seq (tRNA reduction and cleavage sequencing), ribosome profiling, CRISPR/Cas9 knockout of Mettl1 and Wdr4, differentiation assays |
Molecular cell |
High |
29983320
|
| 2007 |
The yeast Trm8-Trm82 (ortholog of METTL1-WDR4) complex requires both the D-stem and T-stem structures of tRNA for efficient methyl-transfer to G46. Tertiary base pairs in the D-stem are important but not essential, suggesting they support induced fit of the G46 base into the catalytic pocket. |
In vitro methyl-transfer activity assays with truncated and mutant yeast tRNA(Phe) transcripts |
FEBS letters |
Medium |
17382321
|
| 2007 |
Active Trm8-Trm82 (yeast ortholog of METTL1-WDR4) heterodimer is only formed when both subunits are co-translated; mixing individually translated subunits does not produce active enzyme, indicating the association is translationally coupled. Kinetic parameters confirmed comparable activity to other tRNA methyltransferases. |
Wheat germ cell-free co-translation, in vitro methyltransferase activity assay, two-dimensional TLC and aniline cleavage to confirm m7G46 production |
Journal of biotechnology |
Medium |
18164779
|
| 2016 |
Drosophila Wuho (WDR4 ortholog) interacts with Flap Endonuclease 1 (FEN1) and localizes to sites of nascent DNA synthesis along with replication proteins FEN1 and PCNA. WH modulates FEN1 endonucleolytic activities in a substrate-dependent manner: it stimulates FEN1 flap endonuclease activity but inhibits gap endonuclease activity. Knockdown of WH in Drosophila, mouse, and human cells causes DNA strand breaks and apoptosis via ATM/Chk2/p53 signaling. |
Co-immunoprecipitation to identify FEN1 as binding partner; fluorescence microscopy for co-localization with replication proteins; siRNA knockdown in multiple species; FEN1 endonuclease activity assays with purified proteins; mouse knockout (early embryonic lethal with DNA damage) |
PLoS biology |
High |
26751069
|
| 2020 |
Drosophila Wuho (WDR4 ortholog) interacts epistatically with the TRIM-NHL protein Mei-p26 (human TRIM32 ortholog) to maintain ovarian germline stem cell homeostasis. In germline stem cells, Wh and Mei-p26 promote BMP stemness signaling; in GSC progeny they silence nanos translation, downregulate differentiation-related microRNAs, and suppress ribosomal biogenesis via dMyc. Human WDR4 interacts with TRIM32 in human cells. |
Genetic epistasis analysis (double mutants), Co-immunoprecipitation (Wh-Mei-p26, WDR4-TRIM32 in human cells), translation reporter assays, signaling pathway readouts |
Development (Cambridge, England) |
Medium |
31941704
|
| 2006 |
Drosophila Wuho (WDR4 ortholog) is essential for spermatogenesis; wh null mutants arrest spermatogenesis at the elongating spermatid stage. In female wh mutants, cystocytes fail to arrest at the fourth mitotic cycle and do not undergo nurse-cell endoreplication. The WH protein contains five WD40 repeats and a bipartite nuclear localization signal. |
P-element mutagenesis, rescue experiments with transgenes (wh vs. top3beta), immunostaining, cytological analysis |
Developmental biology |
Medium |
16762337
|
| 2023 |
WDR4 acts as a substrate adaptor of the CUL4 E3 ubiquitin ligase and mediates ubiquitination and proteasomal degradation of PTPN23 (a component of the ESCRT complex). WDR4-mediated PTPN23 degradation suppresses lysosomal trafficking and degradation of EGFR and c-MET, thereby sustaining their signaling in NSCLC. A competing peptide that blocks PTPN23 binding to WDR4 promotes EGFR/c-MET degradation and inhibits EGFR TKI-resistant NSCLC growth. |
Unbiased ubiquitylome mass spectrometry, Co-IP, ubiquitination assays, lysosome trafficking assays, peptide competition experiments, in vitro and in vivo proliferation/invasion assays |
Cell death & disease |
High |
37821451
|
| 2023 |
WDR4 promotes cerebellar granule neuron progenitor (GNP) proliferation by inducing ubiquitination and degradation of Arhgap17, thereby activating Rac1 and facilitating cell cycle progression. Wdr4 deficiency in GNPs reduces cerebellar foliation and impairs Purkinje neuron organization, leading to locomotion defects. |
Conditional knockout mouse model (Wdr4 in GNPs), ubiquitination assays, Rac1 activity assays, rescue experiments with Arhgap17, immunofluorescence, behavioral locomotion tests |
Cell death & disease |
High |
36681682
|
| 2018 |
Wuho (WDR4) deficiency in mouse embryonic fibroblasts (MEFs) induces γH2AX elevation (DNA damage), heterochromatin relaxation, p53 activation, caspase-mediated apoptosis, and p21-mediated G2/M cell cycle arrest. |
Tamoxifen-inducible Cre-mediated conditional knockout MEFs (CAGGCre-ER), western blot for γH2AX, p53, p21, caspase markers, flow cytometry for cell cycle |
Cellular signalling |
Medium |
29574139
|
| 2021 |
METTL1/WDR4-mediated m7G tRNA modification promotes translation of mRNAs enriched in m7G tRNA-decoded codons (codon usage-linked translation regulation); knockdown of METTL1 decreased translation of such mRNAs, impaired lung cancer cell proliferation, invasion, and tumorigenicity in vitro and in vivo. |
tRNA methylation profiling, mRNA translation profiling (ribosome footprinting), METTL1 mutagenesis (catalytic mutant), gain- and loss-of-function in lung cancer cell lines, xenograft models |
Molecular therapy |
Medium |
34371184
|
| 2021 |
WDR4 is transcriptionally activated by c-MYC, and WDR4 promotes CCNB1 mRNA stability and translation in HCC by enhancing binding of EIF2A to CCNB1 mRNA. This defines a MYC/WDR4/CCNB1/PI3K/AKT/P53 signaling axis. |
ChIP assay for MYC binding to WDR4 promoter, RNA immunoprecipitation for EIF2A-CCNB1 mRNA interaction, mRNA stability assays, Western blot, luciferase reporter, loss-of-function and gain-of-function in HCC cells, xenograft models |
Cell death & disease |
Medium |
34244479
|
| 2023 |
WDR4 promotes nuclear localization of DDX20 and acts as an adaptor to bridge DDX20 and Egr1, thereby inhibiting Egr1-driven transcriptional expression of ARRB2, promoting bladder cancer lymphatic metastasis and progression. |
Co-immunoprecipitation (WDR4-DDX20, WDR4-Egr1), nuclear localization assay, luciferase reporter for ARRB2 transcription, loss-of-function assays in bladder cancer cells and in vivo |
Oncogenesis |
Medium |
37783676
|
| 2024 |
WDR4 modulates m7G modification at internal sites of tumor-promoting mRNAs by forming a WDR4-METTL1 protein complex (confirmed by Co-IP in Huh7 cells). WDR4 knockdown reduces both mRNA and protein levels of METTL1, indirectly reducing the WDR4-METTL1 complex. |
Co-immunoprecipitation (WDR4-METTL1), m7G-MeRIP-seq, RNA-seq, dot blot, CCK-8, colony formation, xenograft tumor models |
Cellular signalling |
Medium |
38493882
|
| 2025 |
Cytoplasmic WDR4, independently of m7G tRNA modification, directly interacts with eIF4E2 to enhance eIF4E-mediated selective translation of ABCA1, promoting membrane cholesterol efflux and maintaining pro-tumoral macrophage polarization in HCC-associated tumor-associated macrophages (TAMs). |
Co-immunoprecipitation (WDR4-eIF4E2), polysome profiling/selective translation assays, cholesterol efflux assays, WDR4 silencing in TAMs via CpG-siRNA delivery, in vivo tumor models |
Nature cell biology |
High |
41315768
|
| 2024 |
WDR4 loss-of-function is associated with increased protein synthesis, upregulation of proteasomal activity, and reduction of free ubiquitin precursor pools, leading to impaired ciliogenesis. Inhibition of proteasomal activity or supplementation with free ubiquitin restores normal ciliogenesis and ameliorates microcephaly phenotypes. |
Human fibroblasts, zebrafish embryos, patient-derived cells; proteasome activity assays, ubiquitin pool measurement, cilia formation assays, proteasome inhibitor and ubiquitin supplementation rescue experiments |
Cell death & disease |
Medium |
39251572
|
| 2025 |
In Drosophila, Wdr4 (WDR4 ortholog) cooperates with Mettl1 to catalyze m7G modification of let-7 miRNA. Loss of Wdr4 or Mettl1 reduces let-7 levels, aberrantly activating TOR-JNK-dMyc signaling, driving elevated ribosome biogenesis, intestinal stem cell overproliferation, and intestinal dysplasia. Expression of human WDR4 and METTL1 (but not catalytic-dead METTL1 mutant) rescues ISC homeostasis. |
Drosophila genetic loss-of-function, let-7 miRNA modification assays, TOR/JNK pathway readouts, ribosome biogenesis assays, transgenic human WDR4/METTL1 rescue experiments with catalytic-dead mutant controls |
EMBO reports |
Medium |
41663759
|
| 2025 |
METTL1/WDR4-mediated m7G methylation stabilizes SCLT1 mRNA; knockdown reduces SCLT1 methylation and mRNA stability, while wild-type but not catalytically inactive METTL1 restores stability. METTL1/WDR4-mediated m7G modification of SCLT1 activates the NF-κB signaling pathway to confer gefitinib resistance in NSCLC. |
m7G MeRIP-seq, RNA-seq, mRNA stability assays, catalytic mutant rescue experiments, NF-κB pathway assays, xenograft models |
Genomics, proteomics & bioinformatics |
Medium |
40857569
|
| 2025 |
WDR4 overexpression reshapes the tRNA m7G methylome in adipocytes, enhancing translation of BMP8B; BMP8B knockdown partially counteracts WDR4-mediated mitophagy and adipocyte browning, placing WDR4-driven tRNA m7G modification upstream of BMP8B translation in the browning pathway. |
TRAC-seq, tRNA m7G methylome profiling, BMP8B knockdown rescue, mitophagy markers (LC3, mitochondrial ultrastructure), 3T3-L1 overexpression/knockout experiments |
Adipocyte |
Low |
41292047
|
| 2025 |
WDR4 interacts with GSK3β (identified by Co-IP-LC/MS) and promotes GSK3β phosphorylation, thereby activating the β-catenin pathway to promote CRC proliferation, migration, and invasion. |
Co-IP-LC/MS to identify GSK3β binding, western blot for GSK3β phosphorylation, β-catenin pathway readouts, loss-of-function and gain-of-function in CRC cells and xenograft models |
Biochemistry and cell biology |
Low |
40009829
|