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Relationships between transposable elements based upon the integrase-transposase domains: is there a common ancestor?
1Laboratoire Populations, Génétique et Evolution, CNRS, 91198 Gif/Yvette Cedex, France.
Journal of Molecular Evolution
|March 1, 1996
Summary
Researchers compared RNA and DNA-mediated transposable elements, finding a common ancestor for some integrases and transposases. This evolutionary history sheds light on the DDE signature
Area of Science:
- Molecular Biology
- Evolutionary Biology
- Genetics
Background:
- Transposable elements (TEs) are mobile genetic sequences.
- TEs are classified into RNA-mediated (Class I) and DNA-mediated (Class II) elements.
- The DDE signature is a conserved motif crucial for TE integration.
Purpose of the Study:
- To compare the integrase domain of Class I TEs and the transposase domain of Class II TEs.
- To analyze evolutionary relationships between different TE families, including mariner-Tc1, IS elements, retrotransposons, and retroviruses.
- To propose an evolutionary history for integrases and transposases based on sequence alignments.
Main Methods:
- Comparative analysis of the integrase/transposase domain.
- Sequence alignment of conserved DDE signature regions.
- Phylogenetic analysis to infer evolutionary relationships.
Main Results:
- The mariner-Tc1 superfamily, LTR retrotransposons, and retroviruses form monophyletic groups.
- Bacterial IS elements are distributed across multiple phylogenetic groups.
- A common ancestry is suggested for certain integrases and transposases.
Conclusions:
- The study provides insights into the evolutionary history of transposable elements.
- Evidence supports a shared evolutionary origin for some key enzymes involved in transposition and integration.
- Phylogenetic analysis reveals distinct evolutionary trajectories for different TE classes.