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Negative autoregulation of BMP dependent transcription by SIN3B splicing reveals a role for RBM39

ABSTRACT: We conducted RNASeq using mRNA extracted from C2C12 mouse myoblast cells transfected with non-targeting control (NTC) or RBM39 siRNA, to elucidate the effect of RBM39 on regulation of BMP4 pathway

ORGANISM(S): Mus musculus

PROVIDER: GSE197107 | GEO | 2022/02/22

REPOSITORIES: GEO

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Negative autoregulation of BMP dependent transcription by SIN3B splicing reveals a role for RBM39.

Project description:BMP signalling is negatively autoregulated by several genes including SMAD6, Noggin and Gremlin, and autoregulators are possible targets for enhancing BMP signalling in disorders such as fibrosis and pulmonary hypertension. To identify novel negative regulators of BMP signalling, we used siRNA screening in mouse C2C12 cells with a BMP-responsive luciferase reporter. Knockdown of several splicing factors increased BMP4-dependent transcription and target gene expression. Knockdown of RBM39 produced the greatest enhancement in BMP activity. Transcriptome-wide RNA sequencing identified a change in Sin3b exon usage after RBM39 knockdown. SIN3B targets histone deacetylases to chromatin to repress transcription. In mouse, Sin3b produces long and short isoforms, with the short isoform lacking the ability to recruit HDACs. BMP4 induced a shift in SIN3B expression to the long isoform, and this change in isoform ratio was prevented by RBM39 knockdown. Knockdown of long isoform SIN3B enhanced BMP4-dependent transcription, whereas knockdown of the short isoform did not. We propose that BMP4-dependent transcription is negatively autoregulated in part by SIN3B alternative splicing, and that RBM39 plays a role in this process.

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Negative autoregulation of BMP dependent transcription by SIN3B splicing reveals a role for RBM39

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