Dataset Information

ChIRP-MS of the lncRNA SAMMSON in uveal melanoma

ABSTRACT: Long non-coding RNAs (lncRNAs) can exhibit cell-type or even cancer-type specific expression profiles, making them highly attractive as therapeutic targets. PAN cancer RNA sequencing data revealed sustained expression of the SAMMSON lncRNA in uveal melanoma (UM), the most common primary intraocular malignancy in adults. Currently, there are no effective treatments for UM patients with metastatic disease, resulting in a median survival time of 6-12 months. We aimed to investigate the therapeutic potential of SAMMSON inhibition in UM.

INSTRUMENT(S): Q Exactive HF

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Cell Culture

SUBMITTER: Louis Delhaye

LAB HEAD: Sven Eyckerman

PROVIDER: PXD023511 | Pride | 2021-10-04

REPOSITORIES: Pride

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Publications

The long non-coding RNA SAMMSON is essential for uveal melanoma cell survival.

Dewaele Shanna S Delhaye Louis L De Paepe Boel B de Bony Eric James EJ De Wilde Jilke J Vanderheyden Katrien K Anckaert Jasper J Yigit Nurten N Nuytens Justine J Vanden Eynde Eveline E Smet Joél J Verschoore Maxime M Nemati Fariba F Decaudin Didier D Rodrigues Manuel M Zhao Peihua P Jochemsen Aart A Leucci Eleonora E Vandesompele Jo J Van Dorpe Jo J Marine Jean-Christophe JC Van Coster Rudy R Eyckerman Sven S Mestdagh Pieter P

Oncogene 20210910 1

Long non-coding RNAs (lncRNAs) can exhibit cell-type and cancer-type specific expression profiles, making them highly attractive as therapeutic targets. Pan-cancer RNA sequencing data revealed broad expression of the SAMMSON lncRNA in uveal melanoma (UM), the most common primary intraocular malignancy in adults. Currently, there are no effective treatments for UM patients with metastatic disease, resulting in a median survival time of 6-12 months. We aimed to investigate the therapeutic potentia ...[more]

PMID: 34508176

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Project description:While thousands of long non-coding RNAs (lncRNAs) are expressed in higher eukaryotes, the potential regulatory roles of lncRNAs in regulated gene transcription programs remain rather poorly understood. Here, we report that two lncRNAs highly overexpressed in aggressive prostate cancer, PRNCR1 and PCGEM1, bind successively to the androgen receptor (AR) and strongly enhance both ligand-dependent and ligand-independent AR-mediated gene activation programs and proliferation in prostate cancer cells. Binding of PRNCR1 to the C-terminally acetylated AR on enhancers and its association with DOT1L appear to be required for recruitment of the second lncRNA, PCGEM, to the N-terminally methylated AR. Unexpectedly, recognition of the H3K4me3 promoter mark by the PHD finger-domain of Pygopus2, recruited by PCGEM1, proves to enhance selective looping of AR-bound enhancers to target gene promoters in these cells, revealing a novel aspect of ligand-induced enhancer-promoter interactions. In M-bM-^@M-^\resistantM-bM-^@M-^] prostate cancer cells, these overexpressed lncRNAs can interact with, and are required for the robust activation of both truncated and full length AR, causing DHT-independent activation of the AR transcriptional program and cell proliferation. Conditionally-expressed short hairpin RNA (shRNA)-mediated targeting of these lncRNAs in these resistant cancer cell lines strongly suppressed xenograft growth in vivo. Together, these results suggest that these overexpressed lncRNAs can potentially serve as a required component of castration-resistance in prostatic tumors. Global Run On (GRO) assay followed by high throughput sequencing (GRO-seq); ChIRP-seq data for a lincRNA (PCGEM1). LNCaP cells were grown to 30-50% confluence and siRNA/ASO transfections were carried out using Lipofectamine 2000 (Invitrogen) according to the manufacturerM-bM-^@M-^Ys instructions. Control samples were transfected with scramble ASO and control siRNA, respectively. On the following day of transfection, the cells were cultured in UltraCULTURE (Phenol red free) + 5% Charcoal Dextran Stripped (CDS) serum for 48 hours. For androgen induction, we treat cells with DHT from a 100 uM stock in 70% ethanol to a final concentration of 100 nM for 1 hour we have sequenced the DNA sequences that are associated with the presence of a RNA molecule on a genome wide scale. PCGEM1 probe, -DHT PCGEM1 probe, +DHT

Dataset Information

ChIRP-MS of the lncRNA SAMMSON in uveal melanoma

Publications

The long non-coding RNA SAMMSON is essential for uveal melanoma cell survival.

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