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RNA-seq of total RNA in budding yeast wild-type and rrp6∆ strains, and in dbr1∆ or sen1-1 dbr1∆ strains expressing either a control or decoy RNA.

ABSTRACT: RNA-seq of total RNA in budding yeast wild-type and rrp6∆ strains, and in dbr1∆ or sen1-1 dbr1∆ strains expressing either a control or decoy RNA.

PROVIDER: PRJNA566113 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR10136300.fastq.gz	Fastqsanger.gz
	SRR10136301.fastq.gz	Fastqsanger.gz
	SRR10136302.fastq.gz	Fastqsanger.gz
	SRR10136303.fastq.gz	Fastqsanger.gz
	SRR10136304.fastq.gz	Fastqsanger.gz

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Characterization of extended transcripts by RNA-Seq suggests that Rrp6 influences Nrd1-dependent termination

Project description:RNAPII is responsible for transcription of protein-coding genes and short, regulatory RNAs. In Saccharomyces cerevisiae, termination of RNAPII-transcribed RNAs ≤1000 bases requires the NNS complex (comprised of Nrd1, Nab3, and Sen1) processing by the exosome, and the nuclear specific catalytic subunit, Rrp6. It has been shown that Rrp6 interacts directly with Nrd1, but whether or not Rrp6 is required for NNS-dependent termination is unclear. Loss of Rrp6 function may result in extension (or inhibition of termination) of NNS-dependent transcripts, or Rrp6 may only function after the fact to carry out RNA 3’ end processing. Here, we performed in-depth differential expression analyses and compare RNA-sequencing data of transcript length and abundance in cells lacking RRP6 to previously published sequencing data measuring the length of RNAs in Nrd1-depleted cells. We find many transcripts that were defined as unterminated upon loss of Nrd1 activity are of similar length in rrp6Δ, and expression levels of downstream genes are significantly decreased. This suggests a similar transcription interference mechanism occurs in cells lacking either Nrd1 or Rrp6, supporting the hypothesis that Rrp6 activity is required for proper NNS termination in vivo. Four biological replicates each for deletion mutant (RRP6) and reference cells (WT)

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Characterization of extended transcripts by RNA-Seq suggests that Rrp6 influences Nrd1-dependent termination

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Project description:We obtained Nab3, Nrd1, and RNA polymerase II occupancy profiles across the genome of S.cerevisiae in wild-type and rrp6∆ strains. This allowed us to determine the impact of defective nuclear exosome on NNS-dependent transcription termination.

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Project description:Pervasive transcription is a widespread phenomenon leading to the production of a plethora of non-coding RNAs (ncRNAs) without apparent function. Pervasive transcription poses a risk that needs to be controlled to prevent the perturbation of gene expression. In yeast, the highly conserved helicase Sen1 restricts pervasive transcription by inducing termination of non-coding transcription. However, the mechanisms underlying the specific function of Sen1 at ncRNAs are poorly understood. Here we identify a motif in an intrinsically disordered region of Sen1 that mimics the phosphorylated carboxy terminal domain (CTD) of RNA polymerase II and characterize structurally its recognition by the CTD-interacting domain of Nrd1, an RNA-binding protein that binds specific sequences in ncRNAs. In addition, we show that Sen1-dependent termination strictly requires the recognition of the Ser5-phosphorylated form of the CTD by the N-terminal domain of Sen1. Furthermore, we find that the N-terminal and the C-terminal domains of Sen1 can mediate intra-molecular interactions. Our results shed light onto the network of protein-protein interactions that control termination of non-coding transcription by Sen1.

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