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Related Concept Videos

Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

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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...
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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.
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mRNA Stability and Gene Expression02:51

mRNA Stability and Gene Expression

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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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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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In vitro Transcription and Capping of Gaussia Luciferase mRNA Followed by HeLa Cell Transfection
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Myc and mRNA capping.

Sianadh Dunn1, Victoria H Cowling1

  • 1MRC Protein Phosphorylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK.

Biochimica Et Biophysica Acta
|April 1, 2014
PubMed
Summary
This summary is machine-generated.

The oncogene c-Myc promotes cell proliferation by enhancing mRNA capping. Targeting this capping mechanism offers a potential new strategy to inhibit c-Myc in tumors.

Keywords:
7-methylguanosineCappingTranscriptionc-MycmRNA

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Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • c-Myc is a proto-oncogene frequently deregulated in human tumors, driving uncontrolled cell proliferation.
  • c-Myc regulates gene expression by recruiting transcriptional co-factors and influencing RNA polymerase II activity.
  • The mRNA cap structure is crucial for transcript stability, processing, and translation initiation.

Purpose of the Study:

  • To investigate the role of c-Myc in mRNA capping.
  • To elucidate the molecular mechanisms by which c-Myc influences capping.
  • To explore the therapeutic potential of targeting c-Myc-mediated capping.

Main Methods:

  • Analysis of c-Myc's interaction with transcriptional machinery.
  • Assessing the impact of c-Myc on mRNA capping efficiency.
  • Investigating the role of SAHH in c-Myc-induced capping.

Main Results:

  • c-Myc upregulates mRNA capping by promoting RNA polymerase II phosphorylation and increasing SAHH levels.
  • Elevated c-Myc expression increases the proportion of capped transcripts, enhancing translation rates.
  • c-Myc-induced capping is essential for c-Myc-dependent gene expression and cell proliferation.

Conclusions:

  • c-Myc directly promotes mRNA capping, a critical step for gene expression and proliferation.
  • Targeting the mRNA capping process represents a novel therapeutic avenue for c-Myc-driven cancers.