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The E. coli K-12 chromosome flanked by two IS10 sequences transposes
Molecular & General Genetics : MGG
|January 1, 1984
Summary
Large DNA segments can transpose, challenging previous understanding of transposon size limits. This study demonstrates bacterial chromosome transposition, suggesting size is not a barrier for these mobile genetic elements.
Area of Science:
- Molecular Biology
- Genetics
- Microbiology
Background:
- Transposons are mobile genetic elements common in prokaryotes.
- Transposon size typically ranges up to 20 kilobases.
- The capacity for larger DNA segments to transpose remains largely unexplored.
Purpose of the Study:
- To investigate if large DNA segments can undergo transposition.
- To determine the transposition frequency of a large DNA segment in E. coli.
Main Methods:
- Utilized IS10 sequences to flank a large DNA segment (E. coli K-12 chromosome, 4,000 kilobases).
- Transposed the flanked DNA segment to the pACYC177 plasmid.
- Quantified transposition frequency per cell per generation.
Main Results:
- Observed transposition of the 4,000 kilobase E. coli K-12 chromosome.
- Achieved a transposition frequency of 10(-8) per cell per generation.
- Demonstrated transposition occurs without duplication of the internal DNA sequence.
Conclusions:
- Transposition is not limited by the size of the DNA segment.
- The IS10 flanking sequences facilitate the transposition of large genomic regions.
- This finding expands the known mechanisms of horizontal gene transfer and genome plasticity.