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Ribosome profiling of the retrovirus murine leukemia virus

ABSTRACT: Ribosome profiling of the retrovirus murine leukemia virus

PROVIDER: PRJEB23562 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR2201450.fastq.gz	Fastqsanger.gz
	ERR2201451.fastq.gz	Fastqsanger.gz
	ERR2201443.fastq.gz	Fastqsanger.gz
	ERR2201444.fastq.gz	Fastqsanger.gz
	ERR2201445.fastq.gz	Fastqsanger.gz

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Ribosome profiling of the retrovirus murine leukemia virus

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Ribosome profiling of the retrovirus murine leukemia virus.

Project description:BACKGROUND:The retrovirus murine leukemia virus (MuLV) has an 8.3 kb RNA genome with a simple 5'-gag-pol-env-3' architecture. Translation of the pol gene is dependent upon readthrough of the gag UAG stop codon; whereas the env gene is translated from spliced mRNA transcripts. Here, we report the first high resolution analysis of retrovirus gene expression through tandem ribosome profiling (RiboSeq) and RNA sequencing (RNASeq) of MuLV-infected cells. RESULTS:Ribosome profiling of MuLV-infected cells was performed, using the translational inhibitors harringtonine and cycloheximide to distinguish initiating and elongating ribosomes, respectively. Meta-analyses of host cell gene expression demonstrated that the RiboSeq datasets specifically captured the footprints of translating ribosomes at high resolution. Direct measurement of ribosomal occupancy of the MuLV genomic RNA indicated that ~ 7% of ribosomes undergo gag stop codon readthrough to access the pol gene. Initiation of translation was found to occur at several additional sites within the 5' leaders of the gag and env transcripts, upstream of their respective annotated start codons. CONCLUSIONS:These experiments reveal the existence of a number of previously uncharacterised, ribosomally occupied open reading frames within the MuLV genome, with possible regulatory consequences. In addition, we provide the first direct measurements of stop codon readthrough efficiency during cellular infection.

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Project description:Despite the advanced understanding of disease mechanisms, the current therapeutic regimens fail to cure most patients with acute myeloid leukemia (AML). In the present study, we address the role of protein synthesis control in AML leukemia stem cell (LSC) function and leukemia propagation. We apply a murine model of mixed-lineage leukemia-rearranged AML to demonstrate that LSCs synthesize more proteins per hour compared with the bulk of leukemia. Using a genetic model that permits inducible and graded regulation of ribosomal subunit joining, we show that defective ribosome assembly leads to a significant survival advantage by selectively eradicating LSCs but not normal hematopoietic stem and progenitor cells. Finally, transcriptomic and proteomic analyses identify a rare subset of LSCs with immature stem cell signature and high ribosome content that underlies the resistance to defective ribosome assembly. Collectively, our study unveils a critical requirement of high protein synthesis rate for LSC function, highlighting ribosome assembly as a therapeutic target in AML.

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