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Related Experiment Videos

Upstream sequence elements enhance poly(A) site efficiency of the C2 complement gene and are phylogenetically

A Moreira1, M Wollerton, J Monks

  • 1Sir William Dunn School of Pathology, University of Oxford, UK.

The EMBO Journal
|August 1, 1995
PubMed
Summary

Researchers identified a novel upstream sequence element (USE) in mammalian C2 complement gene polyadenylation signals. This conserved element is crucial for efficient polyadenylation, expanding our understanding of gene regulation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Gene Regulation

Background:

  • Mammalian pre-mRNA polyadenylation typically involves an AAUAAA sequence and a downstream GU/U-rich element.
  • Viral polyadenylation signals can include upstream elements that enhance efficiency.
  • The C2 complement gene is closely spaced to the Factor B gene, suggesting unique regulatory mechanisms.

Purpose of the Study:

  • To identify and characterize non-viral upstream sequence elements (USEs) involved in polyadenylation.
  • To investigate the conservation and functional significance of a USE in the human C2 complement gene.
  • To explore the regulatory elements surrounding mammalian C2 polyadenylation and termination signals.

Main Methods:

  • Isolation and sequencing of the intergenic region containing the C2 poly(A) site from five mammalian species.

Related Experiment Videos

  • Extensive mutagenesis of the human C2 USE to assess its functional importance.
  • Analysis of sequences flanking the cleavage site and downstream regions for regulatory elements.

    • Main Results:

    • The first non-viral upstream sequence element (USE) was identified for the human C2 complement gene poly(A) site.
    • This USE is highly conserved across five mammalian species (human, mouse, cat, rabbit, cow).
    • Mutagenesis revealed that most of the 53-nucleotide human USE is essential for full polyadenylation activity.
    • Human C2 poly(A) site lacks obvious downstream GU/U-rich elements, but sequences near the cleavage site are critical.
    • Other mammalian C2 poly(A) sites possess significant downstream GU/U-rich sequences.
    • Conserved transcriptional termination signals were found immediately downstream of all five mammalian C2 poly(A) signals.

    Conclusions:

    • The identified USE is a crucial component of the mammalian C2 complement gene's polyadenylation signal.
    • The conservation of the USE highlights its functional importance in gene regulation.
    • The findings reveal species-specific variations in polyadenylation signal composition and conserved termination signals, likely influenced by gene proximity.