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mRNA Stability and Gene Expression02:51

mRNA Stability and Gene Expression

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.
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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...
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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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Nonsense-mediated mRNA Decay02:27

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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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pre-mRNA Processing

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
Pre-mRNA Processing02:01

Pre-mRNA Processing

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...

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Multiple mRNA decapping enzymes in mammalian cells.

Man-Gen Song1, You Li, Megerditch Kiledjian

  • 1Department of Cell Biology and Neuroscience, Rutgers University, Piscataway, NJ 08854, USA.

Molecular Cell
|November 13, 2010
PubMed
Summary

The decapping enzyme Dcp2 (Decapping protein 2) has a limited role in mRNA decay, with Nudt16 emerging as a key cytoplasmic enzyme. Mammalian cells utilize multiple decapping enzymes for RNA turnover.

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Area of Science:

  • Molecular Biology
  • Gene Expression Regulation
  • RNA Metabolism

Background:

  • RNA degradation is crucial for controlling gene expression.
  • Eukaryotic mRNA decay involves deadenylation, decapping, and exonucleolytic decay.
  • Dcp2 was previously thought to be the sole cytoplasmic decapping enzyme.

Purpose of the Study:

  • To investigate the role of Dcp2 in mRNA decay.
  • To identify other potential mRNA decapping enzymes in mammalian cells.
  • To characterize the function of Nudt16 in cytoplasmic mRNA decapping.

Main Methods:

  • Analysis of Dcp2 protein levels in mouse and human tissues.
  • Generation and analysis of a hypomorphic Dcp2 knockout mouse model.
  • Assessment of Nudt16's role as a cytoplasmic decapping enzyme.
  • mRNA stability assays for Nudt16 targets, including Angiomotin-like 2.

Main Results:

  • Dcp2 protein is not detectable in certain mouse and human tissues.
  • Dcp2 contributes modestly to bulk mRNA decay.
  • A hypomorphic Dcp2 knockout mouse exhibited no adverse effects.
  • Nudt16 is a ubiquitous cytoplasmic decapping enzyme in mammalian cells.
  • Nudt16 regulates the stability of specific mRNAs, such as Angiomotin-like 2.

Conclusions:

  • Mammalian cells possess multiple mRNA decapping enzymes.
  • Nudt16 is a significant cytoplasmic decapping enzyme involved in mRNA turnover.
  • The role of Dcp2 in mRNA decay may be less central than previously believed.