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Updated: Jan 4, 2026
Preparation of Cytoplasmic and Nuclear Long RNAs from Primary and Cultured Cells
Published on: April 7, 2023
Nuclear sorting of RNA
William Garland1, Torben Heick Jensen1
1Department of Molecular Biology and Genetics, Aarhus University, Aarhus C., Denmark.
Abstract:
The majority of the mammalian genome is transcribed by RNA polymerase II, yielding a vast amount of noncoding RNA (ncRNA) in addition to the standard production of mRNA. The typical nuclear biogenesis of mRNA relies on the tightly controlled coupling of co- and post-transcriptional processing events, which ultimately results in the export of transcripts into the cytoplasm. These processes are subject to surveillance by nuclear RNA decay pathways to prevent the export of aberrant, or otherwise "non-optimal," transcripts. However, unlike mRNA, many long ncRNAs are nuclear retained and those that maintain enduring functions must employ precautions to evade decay. Proper sorting and localization of RNA is therefore an essential activity in eukaryotic cells and the formation of ribonucleoprotein complexes during early stages of RNA synthesis is central to deciding such transcript fate. This review details our current understanding of the pathways and factors that direct RNAs towards a particular destiny and how transcripts combat the adverse conditions of the nucleus. This article is categorized under: RNA Export and Localization > Nuclear Export/Import RNA Turnover and Surveillance > Turnover/Surveillance Mechanisms RNA Interactions with Proteins and Other Molecules > Protein-RNA Interactions: Functional Implications.
Insights
This review explores how cells manage RNA sorting and localization, focusing on how messenger RNA (mRNA) and noncoding RNA (ncRNA) navigate nuclear export and decay pathways.
Area of Science:
- Molecular Biology
- Genomics
- Cell Biology
Background:
- The mammalian genome extensively transcribes noncoding RNAs (ncRNAs) alongside messenger RNAs (mRNAs) via RNA polymerase II.
- mRNA biogenesis involves coupled processing for cytoplasmic export, with nuclear surveillance pathways preventing aberrant transcript release.
- Many long ncRNAs are retained in the nucleus and must evade decay to perform their functions.
Purpose of the Study:
- To review the pathways and factors governing RNA sorting and localization within eukaryotic cells.
- To explain how RNA transcripts, particularly ncRNAs, combat nuclear decay mechanisms.
- To highlight the importance of ribonucleoprotein complex formation in determining RNA fate.
Main Methods:
- Literature review of current understanding in RNA biology.
- Analysis of nuclear RNA export, import, and turnover/surveillance mechanisms.
- Examination of protein-RNA interactions in functional implications.
Main Results:
- RNA sorting and localization are crucial cellular activities.
- Ribonucleoprotein complex formation early in RNA synthesis is key to transcript fate.
- ncRNAs employ specific strategies to evade nuclear decay pathways.
Conclusions:
- Understanding RNA fate determination is essential for comprehending gene expression regulation.
- Cellular mechanisms actively control RNA localization and stability.
- Further research into ncRNA nuclear retention and decay evasion is warranted.
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