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Related Experiment Videos

Two different E2F6 proteins generated by alternative splicing and internal translation initiation.

Tillman Dahme1, Jason Wood, David M Livingston

  • 1Dana Farber Cancer Institute and Harvard Medical School, Boston, MA, USA.

European Journal of Biochemistry
|October 18, 2002
PubMed
Summary
This summary is machine-generated.

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The E2F6 gene produces two mRNA variants, E2F6 and E2F6b. Internal translation initiation generates E2F6b, a truncated E2F6 protein, impacting cell cycle regulation.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • E2F transcription factors regulate cell cycle progression.
  • E2F6 is a retinoblastoma-protein-independent repressor crucial for skeletal development.
  • The E2f6 locus produces two mRNAs: E2F6 and E2F6b, with E2F6b arising from alternative splicing.

Purpose of the Study:

  • To investigate if a protein is translated from the E2F6b mRNA.
  • To characterize the E2F6b protein and its expression patterns.
  • To explore the mechanism of E2F6b translation.

Main Methods:

  • Analysis of E2F6b mRNA splicing and translation.
  • Ubiquitous expression analysis in mouse tissues.
  • Cell cycle expression profiling.

Related Experiment Videos

  • Investigation of 5' untranslated regions and upstream AUG codons.

    • Main Results:

    • Internal translation initiation produces E2F6b, an amino-terminal truncated E2F6 protein.
    • Both E2F6 and E2F6b mRNAs are ubiquitously expressed in mouse tissues.
    • Highest expression of both forms occurs at the G1 to S phase transition.
    • Long 5' untranslated regions with upstream AUGs suggest internal ribosome entry for E2F6b translation.

    Conclusions:

    • Regulated internal translation initiation generates distinct E2F6 isoforms.
    • These isoforms may play roles under different physiological conditions.
    • This mechanism allows for novel protein diversity from a single gene locus.