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- W4224042852 abstract "Abstract Background Metastasis leads to recurrence and death in colorectal cancer (CRC) patients; however, mechanisms underlying CRC metastasis, especially in its initial stages, remain largely unknown. In this study, we aim to identify long noncoding RNAs (lncRNAs) functionally involved in CRC metastasis initiation and their regulation that could lead to targeted therapeutics. Methods We performed whole transcriptome sequencing using CRC cell lines with divergent spontaneous metastatic properties. The biological roles and mechanisms of lncRNA MIR99AHG were characterized with a series of in vitro and in vivo models and molecular analyses. Results MIR99AHG was upregulated in CRC patients and associated with tumor stage and prognosis. MIR99AHG potently drove migration, invasion and metastasis in CRC cells, and these effects were dependent on its role in promoting invadopodia formation. MIR99AHG interacted with RNA splicing factor PTBP1, which cooperatively modulated alternative splicing of chromatin remodeling gene SMARCA1. Mechanistically, MIR99AHG acted as an address label for PTBP1 to direct its binding to the 5’ splice site of SMARCA1 intron 12, thereby facilitating inclusion of the alternative exon 13 to generate a long isoform (SMARCA1-L). The canonical SMARCA1 inhibited cell migration and invasion and suppressed a core set of genes involved in invadopodia, but the SMARCA1-L was functionally inert in metastasis suppression. Clinically, SMARCA1-L levels were positively correlated with MIR99AHG and PTBP1 in patients with metastatic CRC. Conclusions This study identified that invadopodia was regulated by a splicing switch of SMARCA1 due to the interaction between MIR99AHG and PTBP1, highlighting a novel regulatory mode mediated by lncRNA in alternative splicing of chromatin remodeler during CRC metastasis." @default.
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- W4224042852 date "2022-04-13" @default.
- W4224042852 modified "2023-10-18" @default.
- W4224042852 title "MIR99AHG promotes invadopodia formation in colorectal cancer metastasis by tuning PTBP1-mediated splicing modulation of SMARCA1" @default.
- W4224042852 doi "https://doi.org/10.21203/rs.3.rs-1538014/v1" @default.
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