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Related Experiment Videos

Type I repressors of P element mobility

G B Gloor1, C R Preston, D M Johnson-Schlitz

  • 1Department of Biochemistry, University of Western Ontario, London.

Genetics
|September 1, 1993
PubMed
Summary

Researchers identified a new family of P elements, termed type I repressors, which effectively suppress P element activity. These repressors are structurally distinct and their function depends on genomic location.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Drosophila melanogaster research

Background:

  • P elements are transposable elements in Drosophila melanogaster.
  • P element activity can cause genetic instability and mutations.
  • Repressor elements are crucial for controlling P element transposition.

Purpose of the Study:

  • To characterize a novel family of P elements with repressor functions, designated type I repressors.
  • To define the structural and functional properties of type I repressor elements.
  • To investigate the genomic position effects on repressor activity.

Main Methods:

  • Isolation of type I repressor elements from P strains.
  • In vitro synthesis and analysis of P element constructs.

Related Experiment Videos

  • Assays for repressor function in somatic and germline tissues.
  • Fine structure deletion mapping to identify functional boundaries.

    • Main Results:

    • Type I repressors strongly inhibit P element mobility and a cytotype-dependent allele.
    • Repressor activity is significantly influenced by genomic position.
    • A positive correlation exists between repressor activity across different assays.
    • The minimal 3' boundary for functional type I elements is between nucleotides 1950 and 1956.
    • Elements with deletions extending into exon 2 lacked repressor function.

    Conclusions:

    • Type I repressors represent a structurally distinct class of P elements.
    • These elements do not include extensively deleted forms like the KP element.
    • Type I repressors play a significant role in regulating P element activity in Drosophila.