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The ribosome profiling strategy for monitoring translation in vivo by deep sequencing of ribosome-protected mRNA fragments in HuH-7 cells

ABSTRACT: The ribosome profiling strategy for monitoring translation in vivo by deep sequencing of ribosome-protected mRNA fragments in HuH-7 cells

PROVIDER: PRJNA527113 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8730290.fastq.gz	Fastqsanger.gz
	SRR8730291.fastq.gz	Fastqsanger.gz

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The ribosome profiling strategy for monitoring translation in vivo by deep sequencing of ribosome-protected mRNA fragments

Project description:Recent studies highlight the importance of translational control in determining protein abundance, underscoring the value of measuring gene expression at the level of translation. We present a protocol for genome-wide, quantitative analysis of in vivo translation by deep sequencing. This ribosome profiling approach maps the exact positions of ribosomes on transcripts by nuclease footprinting. The nuclease-protected mRNA fragments are converted into a DNA library suitable for deep sequencing using a strategy that minimizes bias. The abundance of different footprint fragments in deep sequencing data reports on the amount of translation of a gene. Additionally, footprints reveal the exact regions of the transcriptome that are translated. To better define translated reading frames, we describe an adaptation that reveals the sites of translation initiation by pre-treating cells with harringtonine to immobilize initiating ribosomes. The protocol we describe requires 5 - 7 days to generate a completed ribosome profiling sequencing library. Ribosome profiling in cultured mammalian cells under three different footprinting conditions

2012-07-26 | E-GEOD-37744 | biostudies-arrayexpress

The ribosome profiling strategy for monitoring translation in vivo by deep sequencing of ribosome-protected mRNA fragments

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The ribosome profiling strategy for monitoring translation in vivo by deep sequencing of ribosome-protected mRNA fragments in HuH-7 cells

Project description:To globally analyse the lncRNAs with potential coding ability of HCC cells, we performed Ribo-seq using HuH-7 cells. The cycloheximide (CHX) was added to inhibit the translational elongation of ribosomes of the HuH-7 cells.Furthermore,we identified the candidate ORFs with the selected RPF reads using the RiboCode software.

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Distinct stages of the translation elongation cycle revealed by sequencing ribosome-protected mRNA fragments

Project description:During translation elongation, the ribosome ratchets along its mRNA template, incorporating each new amino acid and translocating from one codon to the next. The elongation cycle requires dramatic structural rearrangements of the ribosome. We show here that deep sequencing of ribosome-protected mRNA fragments reveals not only the position of each ribosome but also, unexpectedly, its particular stage of the elongation cycle. Sequencing reveals two distinct populations of ribosome footprints, 28-30 nucleotides and 20-22 nucleotides long, representing translating ribosomes in distinct states, differentially stabilized by specific elongation inhibitors. We find that the balance of small and large footprints varies by codon and is correlated with translation speed. The ability to visualize conformational changes in the ribosome during elongation, at single-codon resolution, provides a new way to study the detailed kinetics of translation and a new probe with which to identify the factors that affect each step in the elongation cycle. Ribosome profiling, or sequencing of ribosome-protected mRNA fragments, in yeast. We assay ribosome footprint sizes and positions in three conditions: untreated yeast (3 replicates) and yeast treated with translation inhibitors cycloheximide (2 replicates) and anisomycin (2 biological replicates, one technical replicate). We also treat yeast with 3-aminotriazole to measure the effect of limited histidine tRNAs on ribosome footprint size and distribution (two treatment durations).

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Analysis of Ribosome Protected Fragments of mRNAs from yeast strains either expressing Rio1p or depleted of Rio1p

Project description:mRNAs bound by ribosomes from yeast cells were analysed in order to determine the exact position of ribosomes in the presence or absence of Rio1p. Beside total Ribosome Protected Fragments (RPFs), RPFs from mRNAs protected by immature pre-40S pre-ribosomes was also analysed. The analysis showed that immature 40S ribosomes can carry out translation and their premature entry into translation is hindered by Rio1p.

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Project description:Recent studies highlight the importance of translational control in determining protein abundance, underscoring the value of measuring gene expression at the level of translation. We present a protocol for genome-wide, quantitative analysis of in vivo translation by deep sequencing. This ribosome profiling approach maps the exact positions of ribosomes on transcripts by nuclease footprinting. The nuclease-protected mRNA fragments are converted into a DNA library suitable for deep sequencing using a strategy that minimizes bias. The abundance of different footprint fragments in deep sequencing data reports on the amount of translation of a gene. In addition, footprints reveal the exact regions of the transcriptome that are translated. To better define translated reading frames, we describe an adaptation that reveals the sites of translation initiation by pretreating cells with harringtonine to immobilize initiating ribosomes. The protocol we describe requires 5-7 days to generate a completed ribosome profiling sequencing library. Sequencing and data analysis require a further 4-5 days.

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