Sudemycin E influences alternative splicing and changes chromatin modifications

作者：Paolo Convertini, Manli Shen, Philip M. Potter, Gustavo F. Palacios, Chandraiah Lagisetti, Pierre de la Grange, Craig Horbinski, Yvonne N. Fondufe‐Mittendorf, Thomas R. Webb, Stefan Stamm · 发表于：Nucleic Acids Research · 年份：2014 · DOI：10.1093/nar/gku151 · 被引用次数：71 · 研究领域：RNA Research and Splicing、RNA and protein synthesis mechanisms、RNA Interference and Gene Delivery

Sudemycin E is an analog of the pre-messenger RNA splicing modulator FR901464 and its derivative spliceostatin A. Sudemycin E causes the death of cancer cells through an unknown mechanism. We found that similar to spliceostatin A, sudemycin E binds to the U2 small nuclear ribonucleoprotein (snRNP) component SF3B1. Native chromatin immunoprecipitations showed that U2 snRNPs physically interact with nucleosomes. Sudemycin E induces a dissociation of the U2 snRNPs and decreases their interaction with nucleosomes. To determine the effect on gene expression, we performed genome-wide array analysis. Sudemycin E first causes a rapid change in alternative pre-messenger RNA splicing, which is later followed by changes in overall gene expression and arrest in the G2 phase of the cell cycle. The changes in alternative exon usage correlate with a loss of the H3K36me3 modification in chromatin encoding these exons. We propose that sudemycin E interferes with the ability of U2 snRNP to maintain an H3K36me3 modification in actively transcribed genes. Thus, in addition to the reversible changes in alternative splicing, sudemycin E causes changes in chromatin modifications that result in chromatin condensation, which is a likely contributing factor to cancer cell death.