Abstract
N6-methyladenosine (m6A) is the most universal internal RNA modification on messenger RNAs and regulates the fate and functions of m6A-modified transcripts through m6A-specific binding proteins. Nevertheless, the functional role and potential mechanism of the m6A reading proteins in ocular melanoma tumorigenicity, especially cancer stem-like cell (CSC) properties, remain to be elucidated. Herein, we demonstrated that the m6A reading protein YTHDF3 promotes the translation of the target transcript CTNNB1, contributing to ocular melanoma propagation and migration through m6A methylation. YTHDF3 is highly expressed in ocular melanoma stem-like cells and abundantly enriched in ocular melanoma tissues, which is related to poor clinical prognosis. Moreover, YTHDF3 is required for the maintenance of CSC properties and tumor initiation capacity in ocular melanoma both in vitro and in vivo. Ocular melanoma cells with targeted YTHDF3 knockdown exhibited inhibitory tumor proliferation and migration abilities. Transcriptome-wide mapping of m6A peaks and YTHDF3 binding peaks on mRNAs revealed a key target gene candidate, CTNNB1. Mechanistically, YTHDF3 enhances CTNNB1 translation through recognizing and binding the m6A peaks on CTNNB1 mRNA.
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Data availability
The raw sequencing data supporting the conclusions of this paper, including RNA-seq, miCLIP-seq, and iCLIP-seq data, have been deposited in the Genome Sequence Archive [65] in the BIG Data Center [66], Beijing Institute of Genomics (BIG), Chinese Academy of Sciences, under accession number CRA002956 (http://bigd.big.ac.cn/gsa/s/n110138p) and are publicly accessible at http://bigd.big.ac.cn/gsa.
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Acknowledgements
We express our sincere thanks for all the patients participated in our study and wish them good health. This work was supported by the National Key Research and Development Plan (2017YFE0196300), the National Natural Science Foundation of China (81772875, U1932135, 82073889), the Clinical Research Plan of SHDC (SHDC2020CR1009A), the Science and Technology Commission of Shanghai (20DZ2270800 and 19JC1410200).
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XQF and YGY designed the research, supervised the experiments and approved the paper. YFX and XYH performed the experiments with assistance from RBJ, PWC, FL, and YY; SZW and BFS performed the bioinformatics analyses and contributed to the experimental candidate selection; YFX, XYH, and SZW analyzed the data, and drafted the paper. SFG and RBJ was responsible for sample collection. All of the authors read and approved this paper.
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Written informed consent was obtained from all patients enrolled in this study. The animal research was approved by the Shanghai Jiao Tong University School of Medicine Animal Care and Use Committee.
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Xu, Y., He, X., Wang, S. et al. The m6A reading protein YTHDF3 potentiates tumorigenicity of cancer stem-like cells in ocular melanoma through facilitating CTNNB1 translation. Oncogene 41, 1281–1297 (2022). https://doi.org/10.1038/s41388-021-02146-0
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DOI: https://doi.org/10.1038/s41388-021-02146-0
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