M7G methylation by METTL1 regulates let-7 microRNAs [m7G-RIP-Seq Caco2]
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE120454 | GEO | 2019/04/26
REPOSITORIES: GEO
Similar Datasets
Project description:Methylation of N7-methylguanosine (m7G) is found at mRNA caps and at defined internal positions within abundant tRNAs and rRNAs. However, its detection within low abundance mRNAs and microRNAs (miRNAs) has been hampered by lack of sensitive detection strategies. Here, we adapt a chemical reactivity assay to detect internal m7G in RNA from eukaryotic cells. Using this approach, alongside a confirmational RNA immunoprecipitation assay, we identify m7G within miRNAs inhibiting cell migration, and show that METTL1 mediates this m7G methylation. Using Let-7 as an example we demonstrate that METTL1 activity is necessary for correct processing, is required for Let-7 dependent gene regulation and consequently has a negative effect on cell migration. These results identify m7G modification as a new pathway for the regulation of miRNAs.
2019-04-26 | GSE120455 | GEO
Project description:Methylation of N7-methylguanosine (m7G) is found at mRNA caps and at defined internal positions within abundant tRNAs and rRNAs. However, its detection within low abundance mRNAs and microRNAs (miRNAs) has been hampered by lack of sensitive detection strategies. Here, we adapt a chemical reactivity assay to detect internal m7G in RNA from eukaryotic cells. Using this approach, alongside a confirmational RNA immunoprecipitation assay, we identify m7G within miRNAs inhibiting cell migration, and show that METTL1 mediates this m7G methylation. Using Let-7 as an example we demonstrate that METTL1 activity is necessary for correct processing, is required for Let-7 dependent gene regulation and consequently has a negative effect on cell migration. These results identify m7G modification as a new pathway for the regulation of miRNAs.
2019-04-26 | GSE112181 | GEO
Project description:Methylation of N7-methylguanosine (m7G) is found at mRNA caps and at defined internal positions within abundant tRNAs and rRNAs. However, its detection within low abundance mRNAs and microRNAs (miRNAs) has been hampered by lack of sensitive detection strategies. Here, we adapt a chemical reactivity assay to detect internal m7G in RNA from eukaryotic cells. Using this approach, alongside a confirmational RNA immunoprecipitation assay, we identify m7G within miRNAs inhibiting cell migration, and show that METTL1 mediates this m7G methylation. Using Let-7 as an example we demonstrate that METTL1 activity is necessary for correct processing, is required for Let-7 dependent gene regulation and consequently has a negative effect on cell migration. These results identify m7G modification as a new pathway for the regulation of miRNAs.
2019-04-26 | GSE112180 | GEO
Project description:N7-methylguanosine (m7G) modification is one of the most prevalent tRNA modifications in human. The precise function and molecular mechanism of m7G tRNA modification in regulation of cancer remain poorly understood. Here we showed that m7G tRNA modification, METTL1 and WDR4 are elevated in hepatocellular carcinoma (HCC) tissues and associated with HCC patient prognosis. Functionally, silencing METTL1 or WDR4 inhibits HCC cell proliferation, migration and invasion, while forced expression of wild type METTL1 but not its catalytic dead mutant promotes HCC progression. Knockdown of METTL1 reduces m7G tRNA modification and decreases m7G modified tRNA expression. Mechanistically, METTL1 depletion selectively decreases the mRNA translation of a subset of oncogenic genes, especially cell cycle and EGFR pathway genes, in m7G-related codon dependent manner. Moreover, in vivo studies using Mettl1 knock-in and knockout mice reveal a critical function of Mettl1 mediated m7G tRNA modifications in promoting hepatocarcinogenesis in the hydrodynamics transfection HCC model. Our work uncovers the critical functions of tRNA m7G modification in regulating cancer mRNA translation and promoting hepatocarcinogenesis, thus provides new insights into role of the mis-regulated tRNA modifications in cancers.
2021-06-26 | GSE174492 | GEO
Project description:The RNA methyltransferase METTL1 catalyzes the N7-methylguanosine (m7G) modification of certain tRNAs, mRNAs, and miRNA precursors. However, the role of METTL1 and its cofactor WDR4 in cancer remains largely unexplored. Here we reveal the oncogenic role of METTL1/WDR4. METTL1 is frequently amplified and overexpressed in cancers and correlates with poor patient survival. METTL1 depletion in human cancer cells causes decreased abundance of m7G-modified tRNAs, altered cell cycle, and inhibits oncogenicity. Strikingly, METTL1/WDR4 overexpression induces oncogenic transformation and carcinogenesis. Mechanistically, we find increased abundance of a subset of m7G-modified tRNAs including tRNA-Arg(TCT), and increased translation of mRNAs enriched in the corresponding AGA codon including cell cycle regulators. Accordingly, expression of tRNA-Arg(TCT) is significantly elevated in many cancer types, correlates with patient survival, and overexpression of this tRNA enhances reporter gene expression and cell transformation. Thus, METTL1/WDR4-mediated m7G tRNA modification drives oncogenic transformation, thereby highlighting METTL1 as a promising cancer therapeutic target.
2020-10-01 | GSE149989 | GEO
Project description:The tRNA N7-methylguanosine (m7G) modification is not essential for yeast growth, but in mammals mis-regulations of tRNA m7G modification cause stem cell defect and developmental disorders. Here we found that tRNA m7G methyltransferase complex components METTL1 and WDR4 are elevated in lung cancer tissues and associated with poor lung cancer prognosis. Functionally, depletion of METTL1 or WDR4 suppresses proliferation, migration, and invasion of lung cancer cells. In addition, forced expression of METTL1 or WDR4 promotes lung cancer progression depending on the tRNA m7G methyltransferase activity. Mechanistically, METTL1 knockdown leads to reduced tRNA m7G modification and decreased expression of m7G-modified tRNAs. Depletion of METTL1 selectively reduces the translation of a subset of oncogenic transcripts, including the genes related to cell proliferation in a m7G related codon dependent manner. Our study uncovered a new layer of translation regulation mechanism mediated by tRNA m7G modification, provided strong evidence to support the important physiological function of mis-regulated tRNA modification in cancer, and suggested that targeting METTL1 could be a promising strategy for lung cancer treatment.
2022-12-31 | GSE173760 | GEO
Project description:The tRNA N7-methylguanosine (m7G) modification is not essential for yeast growth, but in mammals mis-regulations of tRNA m7G modification cause stem cell defect and developmental disorders. Here we found that tRNA m7G methyltransferase complex components METTL1 and WDR4 are elevated in lung cancer tissues and associated with poor lung cancer prognosis. Functionally, depletion of METTL1 or WDR4 suppresses proliferation, migration, and invasion of lung cancer cells. In addition, forced expression of METTL1 or WDR4 promotes lung cancer progression depending on the tRNA m7G methyltransferase activity. Mechanistically, METTL1 knockdown leads to reduced tRNA m7G modification and decreased expression of m7G-modified tRNAs. Depletion of METTL1 selectively reduces the translation of a subset of oncogenic transcripts, including the genes related to cell proliferation in a m7G related codon dependent manner. Our study uncovered a new layer of translation regulation mechanism mediated by tRNA m7G modification, provided strong evidence to support the important physiological function of mis-regulated tRNA modification in cancer, and suggested that targeting METTL1 could be a promising strategy for lung cancer treatment.
2022-12-31 | GSE173750 | GEO
Project description:Background: N7-methylguanosine (m7G) modification is, a more common epigenetic modification in addition to m6A modification, mainly found in mRNA capsids, mRNA interiors, transfer RNA (tRNA), pri-miRNA, and ribosomal RNA (rRNA). It has been found that m7G modifications play an important role in mRNA transcription, tRNA stability, rRNA processing maturation, and miRNA biosynthesis. However, the role of m7G modifications within mRNA and its “writer” methyltransferase 1(METTL1) in tumors, particularly prostate cancer (PCa), has not been revealed. Methods： The differential expression level of METTL1 between hormone-sensitive prostate cancer (HSPC) and castrate-resistant prostate cancer (CRPC) was evaluated via RNA-seq and in vitro experiments. The effects of METTL1 on CRPC progression were investigated through in vitro and in vivo assays. The upstream molecular mechanism of METTL1 expression upregulation and the downstream mechanism of its action were explored via Chromatin Immunoprecipitation quantitative reverse transcription polymerase chain reaction (CHIP-qPCR), Co-immunoprecipitation (Co-IP), luciferase reporter assay, transcriptome-sequencing, m7G AlkAniline-Seq, and mRNA degradation experiments, etc. Results and conclusion： Here, we found that METTL1 was elevated in CRPC and that patients with METTL1 elevation tended to have a poor prognosis. Functionally, the knockdown of METTL1 in CRPC cells significantly limited cell proliferation and invasive capacity. Mechanistically, we unveiled that P300 can form a complex with SP1 and bind to the promoter region of the METTL1 gene via SP1, thereby mediating METTL1 transcriptional upregulation in CRPC. Subsequently, our findings indicated that METTL1 leads to enhanced mRNA stability of CDK14 by adding m7G modifications inside its mRNA, ultimately promoting CRPC progression.
2023-08-22 | GSE239766 | GEO
Project description:The RNA methyltransferase METTL1 catalyzes the N7-methylguanosine (m7G) modification of certain tRNAs, mRNAs, and miRNA precursors. However, the role of METTL1 and its cofactor WDR4 in cancer remains largely unexplored. Here we reveal the oncogenic role of METTL1/WDR4. METTL1 is frequently amplified and overexpressed in cancers and correlates with poor patient survival. METTL1 depletion in human cancer cells causes decreased abundance of m7G-modified tRNAs, altered cell cycle, and inhibits oncogenicity. Strikingly, METTL1/WDR4 overexpression induces oncogenic transformation and carcinogenesis. Mechanistically, we find increased abundance of a subset of m7G-modified tRNAs including tRNA-Arg(TCT), and increased translation of mRNAs enriched in the corresponding AGA codon including cell cycle regulators. Accordingly, expression of tRNA-Arg(TCT) is significantly elevated in many cancer types, correlates with patient survival, and overexpression of this tRNA enhances reporter gene expression and cell transformation. Thus, METTL1/WDR4-mediated m7G tRNA modification drives oncogenic transformation, thereby highlighting METTL1 as a promising cancer therapeutic target.
2020-10-01 | GSE149950 | GEO
Project description:Osteosarcoma is the most common bone tumor that leads to high mortality in adolescents and children. The tRNA N7-methylguanosine methyltransferase METTL1 is located in chromosome 12q14.1, a region that is frequently amplified in osteosarcoma patients, while its functions and underlying mechanisms in regulation of osteosarcoma remain unknown. Herein we show that METTL1 and WDR4 are overexpressed in osteosarcoma and associated with poor patient prognosis. Knockdown of METTL1 or WDR4 causes decreased tRNA m7G modification level and impairs osteosarcoma progression in vitro and in vivo. Conversely, METTL1/WDR4 overexpression promotes osteosarcoma proliferation, migration and invasion capacities. tRNA methylation and mRNA translation profiling indicated that METTL1/WDR4 modified tRNAs enhance translation of mRNAs with more m7G tRNA-decoded codons, including extracellular matrix (ECM) remodeling effectors, which facilitates osteosarcoma progression and chemoresistance to doxorubicin.Our study demonstrates METTL1/WDR4 mediated tRNA m7G modification plays crucial oncogenic functions to enhance osteosarcoma progression and chemoresistance to doxorubicin via alteration of oncogenic mRNA translation, suggesting METTL1 inhibition combined with chemotherapy is a promising strategy for treatment of osteosarcoma patients.
2024-02-01 | GSE225515 | GEO