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The structure of hobo transposable elements and their insertion sites
R D Streck1, J E Macgaffey, S K Beckendorf
1Department of Molecular Biology, University of California, Berkeley, CA 94720, USA.
The EMBO Journal
|December 20, 1986
Summary
Hobo transposable elements in Drosophila are 3.0-kb in size, with smaller versions requiring complete elements for transposition. These elements share structural similarities with other eukaryotic transposable elements, suggesting a common transposition mechanism.
Area of Science:
- Genetics
- Molecular Biology
- Drosophila melanogaster research
Background:
- Transposable elements (TEs) are mobile genetic sequences.
- Hobo elements are a family of TEs found in Drosophila.
- Understanding TE mechanisms is crucial for genome stability.
Purpose of the Study:
- To characterize the structure and transposition mechanism of Drosophila hobo elements.
- To investigate the relationship between full-length and deletion hobo elements.
- To compare hobo elements with other eukaryotic TEs.
Main Methods:
- Sequence analysis of a 3.0-kb hobo element.
- Analysis of 11 independent hobo insertion sites.
- Comparative analysis of hobo structure with other eukaryotic TEs.
Main Results:
- 3.0-kb hobo elements are functionally complete; smaller hobos are defective.
- A 1.9-kb open reading frame was identified within the hobo sequence.
- Hobo elements integrate and duplicate specific target sequences (NNNNNNAC or CTTTNNNN).
- Evidence suggests a mechanism for internal deletion formation involving internal hobo sequences.
- Structural similarities were found between hobo and eukaryotic TEs like P, Ac, 1723, and Tam3.
Conclusions:
- Hobo element distribution supports a model of functional completeness and dependence for smaller elements.
- The hobo element sequence possesses features indicative of regulatory and coding potential.
- Hobo transposition involves specific target site recognition and duplication.
- Internal deletions may arise through a specific mechanism involving internal hobo sequences.
- Conserved structural features suggest a common transposition mechanism across diverse eukaryotic TEs.