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SPT6 interacts with NSD2 and facilitates interferon-stimulated transcription

ABSTRACT: SPT6, encoded by the SUPT6H in humans and Supt6 in mice, respectively, is a conserved histone chaperone that interacts with RNA polymerase II and participates in transcription elongation. However, the question of how SPT6 comes into play in transcriptional activation upon signaling, particularly in mammalian cells, has remained elusive. We investigated the contribution of SPT6 to interferon beta (IFNbeta) induced transcription in mouse NIH3T3 cells. IFNbeta triggers rapid and high level transcription of many IFN-stimulated genes (ISGs). We report here that SPT6 is recruited to ISGs after IFN stimulation. This recruitment was dependent on the interaction with the methyltransferase, NSD2. Further, siRNA-based SPT6 knockdown reduced levels of ISG activation. RNA-Seq analysis showed that SPT6 knockdown diminished about 50% of ISGs whose induction levels were higher than those unaffected by SPT6 knockdown. Under the tested conditions, SPT6 knockdown did not measurably change expression of constitutively expressed genes. This report highlights that SPT6 is recruited in a stimulus-dependent manner and elicits a major impact on signal induced transcription.

ORGANISM(S): Mus musculus

PROVIDER: GSE97302 | GEO | 2018/05/01

REPOSITORIES: GEO

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SPT6-driven error-free DNA repair safeguards genomic stability of glioblastoma cancer stem-like cells

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Project description:Spt6 is an essential histone chaperone that mediates nucleosome reassembly during gene transcription. Spt6 interacts with elongating RNA polymerase II (RNAPII) via a tandem Src2 homology (tSH2) domain, but it is not known whether this particular interaction is required for the nucleosome reassembly activity of Spt6. Here, we show that Spt6 recruitment to genes and its nucleosome reassembly functions are largely independent of association with RNAPII. Instead, the Spt6-RNAPII association is required for post-transcriptional mRNA turnover. Mechanistically, association of Spt6 with RNAPII couples the Ccr4-Not complex to the transcribed regions of genes, which we show regulates the timely deadenylation and degradation of a broad range of mRNAs including those required for cell cycle progression. Thus, our findings reveal an unexpected control mechanism for mRNA turnover facilitated by a histone chaperone during transcription.

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2011-10-20 | E-MTAB-738 | biostudies-arrayexpress

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