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Post-transcriptional regulation of Ribosome Biogenesis in Larp1-deficient cells

ABSTRACT: Post-transcriptional regulation of Ribosome Biogenesis in Larp1-deficient cells

PROVIDER: PRJNA970347 | ENA |

REPOSITORIES: ENA

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Post-transcriptional regulation of Ribosome Biogenesis in Larp1-deficient cells

Project description:Ribosome biogenesis is a critical aspect of cell differentiation. Ribosome synthesis has been previously reported to be regulated at the transcriptional and post-transcriptional levels. Poly(A) tail-length processing is a hallmark of post-transcriptional regulation associated with different steps of transcript metabolism. Here we monitor the contribution of the RNA-binding protein Larp1 in shaping the poly(A) tail profile of undifferentiated P19 cells. We found that Larp1 prevents the widespread shortening of poly(A) tails below 30 nucleotides and confers additional protection to transcripts containing a 5' terminal oligopyrimidine (TOP) motif, such as those encoding for ribosomal proteins.

2023-08-04 | GSE231976 | GEO

Post-transcriptional regulation of Ribosome Biogenesis

Project description:Post-transcriptional regulation of Ribosome Biogenesis

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LARP1 mRNP scaffolds mTORC1 to stimulate translation initiation of an essential class of mRNAs

Project description:The RNA biding protein, LARP1, has been proposed to function downstream of mTORC1 to positively regulate the translation of 5M-bM-^@M-^YTOP mRNAs such as ribosome protein (RP) mRNAs. However, its regulatory roles in mTORC1-mediated translation remain unclear. PAR-CLIP of LARP1 revealed its direct and dynamic interactions with RP mRNAs through pyrimidine-enriched sequences in the 5M-bM-^@M-^YUTR of RP mRNAs when mTOR activity is inhibited. Importantly, this LARP1 is a direct substrate of mTORC1 and S6K1/Akt, and phosphorylated LARP1 scaffolds mTORC1 on translation-competent mRNAs to facilitate 4EBP1 and S6K1 phosphorylation. Ablation of LARP1 causes multiple defects in the processes of translation including abnormal eIF4G1 interaction with RP mRNAs and inefficient RP mRNA elongation thereby reducing ribosome biogenesis and cell proliferation. These observations illustrate that LARP1 functions both an effector and a regulator for local mTORC1 activity, and acts as a molecular switch for ribosome biogenesis by sensing growth factor/nutrient signaling. LARP1-bound RNA regions were sequenced from HEK293T cells under growing or mTOR-inactive conditions. In parallel, mRNA abundance was quantified, in biological duplicate, from HEK293T cells under the same conditions.

2014-07-31 | E-GEOD-59599 | biostudies-arrayexpress

Post-transcriptional regulation of Ribosome Biogenesis during differentiation

Project description:Post-transcriptional regulation of Ribosome Biogenesis during differentiation

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Post-transcriptional regulation of Ribosome Biogenesis during differentiation [dRNA-seq]

Project description:Ribosome biogenesis is a critical component of cell differentiation. Ribosome synthesis has been previously reported to be highly regulated at the transcriptional level, but less is known about its post-transcriptional regulation. Poly(A) tail length regulation is a hallmark of post-transcriptional regulation associated with transcript stability. Here we monitor poly(A) tail length changes at a transcriptome level during P19 differentiation. We found that poly(A) tail shortening occurs during cell differentiation only for transcript encoding for ribosomal proteins. These findings suggest a strong post-transcriptional regulation of ribosome biogenesis during differentiation.

2023-08-04 | GSE214874 | GEO

Post-transcriptional regulation of Ribosome Biogenesis during differentiation [SLAM-seq]

Project description:The regulation of ribosome biogenesis is a critical component of cell differentiation. Although ribosome biogenesis is well known to be regulated at the transcriptional level, its post-transcriptional regulation is less well understood. A key component of RNA post-transcriptional regulation is transcript decay rate which, together with the rate of synthesis, defines the abundance of the transcripts. Here we measured the stability of the whole transcriptome of P19 cells before differentiation (D0) and six days after the onset of differentiation (D6). We found that while global decay rates dropped during differentiation, the stability of transcripts encoding for ribosomal proteins remains significantly high throughout the differentiation process. These results indicate a strong and specific post-transcriptional regulation of ribosome biogenesis transcripts that is sustained during cell differentiation.

2023-08-04 | GSE214860 | GEO

LARP1 mRNP scaffolds mTORC1 to stimulate translation initiation of an essential class of mRNAs

Project description:The RNA biding protein, LARP1, has been proposed to function downstream of mTORC1 to positively regulate the translation of 5’TOP mRNAs such as ribosome protein (RP) mRNAs. However, its regulatory roles in mTORC1-mediated translation remain unclear. PAR-CLIP of LARP1 revealed its direct and dynamic interactions with RP mRNAs through pyrimidine-enriched sequences in the 5’UTR of RP mRNAs when mTOR activity is inhibited. Importantly, this LARP1 is a direct substrate of mTORC1 and S6K1/Akt, and phosphorylated LARP1 scaffolds mTORC1 on translation-competent mRNAs to facilitate 4EBP1 and S6K1 phosphorylation. Ablation of LARP1 causes multiple defects in the processes of translation including abnormal eIF4G1 interaction with RP mRNAs and inefficient RP mRNA elongation thereby reducing ribosome biogenesis and cell proliferation. These observations illustrate that LARP1 functions both an effector and a regulator for local mTORC1 activity, and acts as a molecular switch for ribosome biogenesis by sensing growth factor/nutrient signaling.

2014-07-31 | GSE59599 | GEO

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Project description:Post-transcriptional regulation of Ribosome Biogenesis during differentiation [SLAM-seq]

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Post-transcriptional regulation of Ribosome Biogenesis upon treatment with MHY1485

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Post-transcriptional regulation of Ribosome Biogenesis during differentiation [dRNA-seq]

Project description:Post-transcriptional regulation of Ribosome Biogenesis during differentiation [dRNA-seq]

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