Poly(A)-ClickSeq resolves CF25-mediated alternative poly-adenylation, HeLa
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE94950 | GEO | 2017/05/02
SECONDARY ACCESSION(S): PRJNA374982
REPOSITORIES: GEO
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Project description:The Poly(A)-Tail focused RNA-seq, or PAT-seq approach, is an affordable and efficient tool for the measure of 3’UTR dynamics. We show here that PAT-seq returns (i) digital gene expression, (ii) polyadenylation site usage within and between samples, including alternative adenylation, and (iii) the polyadenylation-state the transcriptome. PAT-seq differs from previous 3’ focused RNA-seq methods in that it strictly depends on native 3’ adenylation within total RNA samples and thus removes the need for ribosome depletion and, that the full native poly(A)-tail is included in the sequencing libraries. Limited RNase digestion combined with size selection and directional sequencing mean that deep-sequencing reads map to within ~50-100 bases of adenylation sites and run from unique sequence into adenosine homopolymers. Here, total RNA samples from budding yeast cells were analyzed to highlight the changes in gene expression and adenylation-state of the transcriptome in response to loss of the deadenylase Ccr4. Furthermore, concordant changes to gene expression and adenylation-state were demonstrated in a classic Crabtree-Warburg metabolic shift. Because all adenylated RNA are interrogated by the PAT-seq approach, alternative adenylation sites, long noncoding RNA and other non-coding RNA and RNA decay intermediates were also identified.
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Project description:MicroRNA induces deadenylation of its targets according to the current model in the scientific community, but this model is based on the studies of a few individual genes. We tested the model by examining the global effect of miRNA on poly(A) tail of the targets. Synthetic miR-1 mimic was transfected into HeLa cells, and the poly(A) length was measured by TAIL-seq. Deadenylation of miR-1 targets was evident as early as 3 hours post-transfection without a significant change in mRNA level. After 6 or 9 hours, target mRNA level was substantially downregulated. Therefore, although there are some exceptions, our result confirms that, in general, miRNA indeed induces deadenylation. Furthermore, our kinetic global analysis confirms that deadenylation precedes mRNA decay. Four culture dishes of HeLa cells were treated with miR-1 all together, then collected and prepared for sequencing after different time of incubation (0, 3, 6, and 9 hours post-transfection)
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Project description:Poly(A) tails are critical for mRNA stability and translation. However, recent studies have challenged this view, showing that poly(A) tail length and translation efficiency are decoupled in non-embryonic cells. Using TAIL-seq and ribosome profiling, we investigate poly(A) tail dynamics and translational control in the somatic cell cycle. We find dramatic changes in poly(A) tail lengths of cell cycle regulatory genes like CDK1, TOP2A, and FBXO5, explaining their translational repression in M phase. We also find that poly(A) tail length is coupled to translation when the poly(A) tail is <20 nucleotides. However, as most genes have >20 nucleotide poly(A) tails, their translation is regulated mainly via poly(A) tail length-independent mechanisms during the cell cycle. Specifically, we find that terminal oligopyrimidine (TOP) tract-containing transcripts escape global translational suppression in M phase and are actively translated. Our quantitative and comprehensive data provide a revised view of translational control in the somatic cell cycle.
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Project description:Poly(A) tails are important elements in mRNA translation and stability. However, recent genome-wide studies concluded that poly(A) tail length was generally not associated with translational efficiency in non-embryonic cells. To investigate if poly(A) tail size might be coupled to gene expression in an intact organism, we used an adapted TAIL-seq protocol to measure poly(A) tails in Caenorhabditis elegans. Surprisingly, we found that well-expressed transcripts contain relatively short, well-defined tails. This attribute appears dependent on translational efficiency, as transcripts enriched for optimal codons and ribosome association had the shortest tail sizes, while non-coding RNAs retained long tails.
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Project description:Poly(A) tails are critical for mRNA stability and translation. However, recent studies have challenged this view, showing that poly(A) tail length and translation efficiency are decoupled in non-embryonic cells. Using TAIL-seq and ribosome profiling, we investigate poly(A) tail dynamics and translational control in the somatic cell cycle. We find dramatic changes in poly(A) tail lengths of cell cycle regulatory genes like CDK1, TOP2A, and FBXO5, explaining their translational repression in M phase. We also find that poly(A) tail length is coupled to translation when the poly(A) tail is <20 nucleotides. However, as most genes have >20 nucleotide poly(A) tails, their translation is regulated mainly via poly(A) tail length-independent mechanisms during the cell cycle. Specifically, we find that terminal oligopyrimidine (TOP) tract-containing transcripts escape global translational suppression in M phase and are actively translated. Our quantitative and comprehensive data provide a revised view of translational control in the somatic cell cycle. HeLa cells were synchronized at S or M phase, and subject to RNA-seq, ribosome profiling and TAIL-seq analysis.
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