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In vitro Transcription and Capping of Gaussia Luciferase mRNA Followed by HeLa Cell Transfection
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Re-capping the message

Daniel R Schoenberg1, Lynne E Maquat

  • 1Department of Molecular and Cellular Biochemistry and Center for RNA Biology, The Ohio State University, Columbus, OH 43210, USA. schoenberg.3@osu.edu

Trends in Biochemical Sciences
|September 5, 2009
PubMed

Insights

The 5'-cap structure on RNA is crucial for its function and decay. New evidence suggests RNA molecules can be re-capped even after losing their original cap, challenging established mRNA decay pathways.

Area of Science:

  • Molecular Biology
  • RNA Biology
  • Biochemistry

Background:

  • The 5'-cap structure is essential for RNA processing, export, translation, and quality control.
  • Cap removal is traditionally viewed as the initial, irreversible step in messenger RNA (mRNA) decay.
  • Recent findings indicate the existence of capped or cap-like structures on mRNAs lacking 5' sequences in mammalian cells.

Purpose of the Study:

  • To investigate the emerging evidence for RNA re-capping.
  • To explore the potential functions of re-capping in cellular processes.
  • To challenge the established model of mRNA decay initiation.

Main Methods:

  • Analysis of mRNA structures in mammalian cells.
  • Identification and characterization of cytoplasmic capping enzymes and associated kinases.
  • Biochemical assays to study RNA capping and decapping processes.

Main Results:

  • Identification of mRNAs with 5' sequence deficiencies but possessing cap or cap-like structures.
  • Discovery of a cytoplasmic capping enzyme and a novel kinase involved in generating capped ends from cleaved RNAs.
  • Evidence supporting the occurrence of RNA re-capping in cellular environments.

Conclusions:

  • The traditional view of irreversible cap removal initiating mRNA decay is being challenged.
  • RNA re-capping is a plausible biological process with potential regulatory roles.
  • Further research is needed to fully elucidate the functions and mechanisms of RNA re-capping.

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