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Haloferax volcanii DS2

ABSTRACT: Transcriptional Landscape and Regulatory Roles of Small Noncoding RNAs in the Oxidative Stress Response of the Haloarchaeon Haloferax volcanii

PROVIDER: PRJNA407425 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR6040890_1.fastq.gz	Fastqsanger.gz
	SRR6040890_2.fastq.gz	Fastqsanger.gz
	SRR6040900_1.fastq.gz	Fastqsanger.gz
	SRR6040900_2.fastq.gz	Fastqsanger.gz
	SRR6040891_1.fastq.gz	Fastqsanger.gz

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Project description:We demonstrate here the transcriptional landscape and functional roles of sRNAs specifically in the regulation of the oxidative stress response of the model haloarchaeon Haloferax volcanii. We sequenced 5 biological replicates of H. volcanii strain H53 under no challenge and oxidative stress (H2O2) conditions at mid-exponential phase (OD 0.4). Thousands of sRNAs, both intergenic and antisense, were discovered using strand-specific sRNA-seq, comprising around 30% of the transcriptome during non-challenged and oxidative stress conditions. Antisense sRNAs were found to overlap both 5’ and 3’ UTRs of mRNAs revealing a hybrid system between Eukarya (3’ UTR) and Bacteria (5’ UTR) sRNA-silencing systems, as well as targeting the coding sequence (CDS) of mRNAs, a unique system to Archaea. We identified hundreds of differentially expressed sRNAs in response to hydrogen peroxide induced oxidative stress in H. volcanii. A majority of these sRNAs are lowly expressed compared to mRNAs. The sRNAs could be classified in two populations based on expression patterns: those that are up-regulated and those that are down-regulated during oxidative stress. Targets of antisense sRNAs decreased in expression when sRNAs were up-regulated indicating that sRNAs are likely playing a negative regulatory role on mRNA targets at the transcript level. Target enrichment of sRNAs included mRNAs involved in transposons, chemotaxis signaling, peptidase activity, transcription factors, and secondary metabolite regulation.

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Project description:Purpose: The Haloferax volcanii ∆tfeB strain provided a unique opportunity to study a putative role of TFEβ in the regulation of gene expression. Results: The deletion of the tfeB gene in H. volcanii results in the aberrant expression of approximately one third of all genes, consistent with its function as a basal transcription initiation factor. Interestingly, tfeB deletion particularly affects foreign genes including a prophage region. Conclusions: Our results confirm the dual function of TFE as basal factor and regulator of transcription

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