Cytoplasmic Mrna Removal
Cytoplasmic Mrna Removal - Related Videos
02:22
Regulated mRNA Transport
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2020
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...
02:31
Nuclear Export of mRNA
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2020
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
01:16
Cytoplasm
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2026
The cytoplasm consists of organelles and a framework of protein scaffolds called the cytoskeleton suspended in an aqueous solution, the cytosol. The cytosol is a rich broth of water, ions, salts, and various organic molecules.Protein Folding and MisfoldingThe cytoplasm is the location for several cellular processes, including protein synthesis and folding. The aqueous nature of the cytosol promotes protein folding such that the hydrophobic amino acid side chains are buried in the protein core...
02:51
mRNA Stability and Gene Expression
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2020
The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity. Cis-acting Elements involved in mRNA stability
05:48
Removal of an Internal Translational Start Site from mRNA While Retaining Expression of the Full-Length Protein
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Cited by 4 •
2022
The present protocol describes a single M213L mutation in Gja1 that retains full-length Connexin43 generation but prevents translation of the smaller GJA1-20k internally translated isoform.
FAQs
Deadenylation shortens the transcript’s poly(A) tail, helping determine how long the mRNA remains available for protein synthesis. Because this change can precede decapping and exonucleolytic digestion, it acts as an important control point in transcript clearance. Regulating this stage allows cells to adjust gene expression without immediately eliminating every molecule of a message.
After preparatory changes such as deadenylation and decapping, cytoplasmic transcripts can be digested from either the 5′ end or the 3′ end. These routes represent alternative directions for exonucleolytic breakdown rather than separate goals. Their availability gives cells more than one way to clear messages and reduce their continued use in protein synthesis.
Endonucleolytic cleavage cuts an mRNA within the transcript rather than requiring digestion from an end first. The resulting fragments can then undergo exonucleolytic digestion, potentially accelerating removal of a message. This route is especially relevant when cells need to clear particular transcripts efficiently, including messages identified as unnecessary or defective through RNA surveillance.
RNA surveillance helps distinguish faulty messages from transcripts that should remain available for translation. When a transcript is recognized as defective, surveillance can promote its accelerated clearance rather than allowing it to persist. This quality-control function complements ordinary regulation of mRNA stability and helps limit the cellular consequences of producing proteins from abnormal messages.
A useful analysis follows the possible progression from poly(A)-tail shortening to decapping and then exonucleolytic digestion from either transcript end. Researchers should also consider endonucleolytic cleavage and RNA surveillance, because these mechanisms can alter the route or speed of clearance. Mapping these alternatives helps connect changes in transcript stability with effects on protein synthesis.
Changing transcript stability lets cells tune protein production as developmental programs or environmental conditions change. Faster clearance can reduce the availability of messages that are no longer needed, while continued stability can preserve transcripts required under current conditions. Consequently, this post-transcriptional control links RNA lifetime with changing cellular priorities without relying only on transcriptional regulation.