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IlAcrPsix

ABSTRACT: Acronicta psi, genomic and transcriptomic data

PROVIDER: PRJEB55132 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	ERR10038430_1.fastq.gz	Fastqsanger.gz
	ERR10038430_2.fastq.gz	Fastqsanger.gz
	ERR10033482.fastq.gz	Fastqsanger.gz
	ERR10890701_1.fastq.gz	Fastqsanger.gz
	ERR10890701_2.fastq.gz	Fastqsanger.gz

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ilAcrPsix

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Mapping of pseudouridine residues on cellular and viral transcripts using a novel antibody-based technique

Project description:Pseudouridine (ψ) is the most common non-canonical ribonucleoside present on mammalian non-coding RNAs (ncRNAs), where is contributes ~10% of the total uridine level. However, ψ constitutes only ~0.3% of the uridines present on mRNAs and its effect on mRNA function remains unclear. Ψ residues have however been shown to inhibit the detection of exogenous RNA transcripts by host innate immune factors, thus raising the possibility that viruses might have subverted the addition of ψ residues to mRNAs by host pseudouridine synthase (PUS) enzymes as a way to inhibit antiviral responses in infected cells. Here, we describe and validate a novel antibody-based ψ mapping technique called photo-crosslinking assisted ψ sequencing (PA-ψ-seq) and then use it to map ψ residues on not only multiple cellular RNAs but also the mRNAs and genomic RNA encoded by HIV-1. We also describe several 293T-derived cell lines in which human PUS enzymes previously reported to add ψ residues to mRNAs, specifically PUS1, PUS7 and TRUB1/PUS4, were individually inactivated by gene editing. Surprisingly, while this allowed us to assign several sites of ψ addition on cellular mRNAs to each of these three PUS enzymes, the ψ sites present on HIV-1 transcripts remained unaffected. However, loss of PUS1 function did significantly reduce HIV-1 gene expression by a presumably indirect mechanism.

2021-09-01 | GSE172136 | GEO

Simultaneous nanopore profiling of mRNA m6A and pseudouridine reveals translation coordination

Project description:N6-methyladenosine (m6A) and pseudouridine (Ψ) are the two most abundant modifications in mammalian mRNA, but the coordination of their biological functions remains poorly understood. We develop a machine learning-based nanopore direct RNA sequencing method (NanoSPA) that simultaneously analyzes m6A and Ψ in the human transcriptome. Applying NanoSPA to polysome profiling, we reveal opposing transcriptomic co-occurrence of m6A and Ψ and synergistic, hierarchical effects of m6A and Ψ on the polysome.

2024-01-06 | GSE230936 | GEO

Genome-wide translational changes induced by the prion [PSI+]

Project description:Prions are infectious proteins that can adopt a structural conformation different from that of the normal protein. This change of conformation is then propagated among other molecules of the same protein. Prions are associated with neurodegenerative diseases in mammals, but are also found in fungi (in the yeast Saccharomyces cerevisiae and the filamentous fungus Podospora anserina), in which they control heritable traits. They are widespread in wild yeast strains, suggesting a biologically important role. [PSI+] is one of the most widely studied yeast prions. It corresponds to an aggregated conformation of the translational release factor, eRF3, which suppresses nonsense codons. [PSI+] modifies cellular fitness, inducing various phenotypes, depending on the genetic background. However, the genes displaying [PSI+]-controlled expression remain largely unknown. We used the recently described ribosome profiling approach to identify genes displaying changes in expression in the presence of [PSI+]. This made it possible to determine the positions of all active ribosomes within the genome, in both [PSI+] and [PSI-] isogenic strains. Comparisons of the translatomes and transcriptomes of the two strains revealed that the primary effect of [PSI+] was to repress genes involved in the stress response. Thus, we provide the first description of the global translational effect of [PSI+] and a new genetic explanation of the phenotypic differences between [PSI-] and [PSI+] strains under stress conditions.

2014-07-18 | GSE41590 | GEO

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