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The oncogenic microRNA miR-222 promotes human LINE-1 retrotransposition

GSE273369 Homo sapiens Expression profiling by high throughput sequencing 8 samples Submitted 2025/06/16 Platform GPL16791
Summary
The Long Interspersed Element-1 (LINE-1) contributes significantly to carcinogenesis and to tumor heterogeneity in many cancer types, including hepatocellular carcinoma (HCC), by its autonomous retrotransposition (RTP) and by its ability to retrotranspose some non-autonomous transposable elements. Previously, multiple proteins and a few microRNAs (miRs) were described as regulators of LINE-1 RTP. Here, we demonstrate that miR-222, which is oncogenic in HCC, promotes LINE-1 RTP in human HCC and some other cell lines in vitro, and that both miR-222-3p and miR-222-5p activate LINE-1 RTP in a cell type-specific manner. We generated miR-222-knockout mutants of the Huh7 and FLC4 HCC cell lines, and performed RNA-seq analysis of Huh7/miR-222-knockout cells and global proteomics analysis of both Huh7 and FLC4 miR-222-knockout mutants. We demonstrate that miR-222 decreases let-7c expression in both Huh7 and FLC4 cells, and that this decrease contributes to promotion of LINE-1 RTP by miR-222 in Huh7 cells.
Published in
The oncogenic microRNA miR-222 promotes human LINE-1 retrotransposition
Friehmann T, Abu Mohsen Y, Schlesinger Y et al. · RNA biology 2025 · PMID 40421600 · doi:10.1080/15476286.2025.2511318
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Also filed as BioProject PRJNA1141495 and SRA study SRP523011. Searching any of these in the dataset finder brings you back here.

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