Related Experiment Videos
Sequence, assembly and analysis of pX01 and pX02
R Okinaka1, K Cloud, O Hampton
1Life Sciences Division, Los Alamos National Laboratory, NM 87545, USA.
Journal of Applied Microbiology
|September 4, 1999
Summary
Sequencing of Bacillus anthracis plasmids pX01 and pX02 reveals over 200 potential open reading frames (ORFs). A distinct 70 kbp region on pX01, containing toxin genes, suggests a different origin from the rest of the plasmid.
Area of Science:
- Microbiology
- Genomics
- Molecular Biology
Background:
- Bacillus anthracis is a bacterium that causes anthrax.
- Plasmids pX01 and pX02 are essential virulence factors in B. anthracis.
- Understanding plasmid structure and gene content is crucial for developing countermeasures.
Purpose of the Study:
- To sequence and annotate the Bacillus anthracis plasmids pX01 and pX02.
- To analyze the gene density and identify potential open reading frames (ORFs).
- To investigate potential differences in the origins of distinct regions within the pX01 plasmid.
Main Methods:
- Random 'shotgun' cloning and high-throughput sequencing.
- Sequence assembly using Sequencher software.
- Bioinformatic analysis including ORF prediction and BLAST searches.
Main Results:
- The pX01 plasmid was assembled to 181,656 bp and pX02 to at least 93,479 bp.
- Over 200 potential ORFs were identified across both plasmids, with less than 40% showing significant similarity to known sequences.
- A 70 kbp region of pX01, including toxin genes, exhibited lower gene density and distinct characteristics, suggesting a different evolutionary origin.
Conclusions:
- The pX01 and pX02 plasmids of Bacillus anthracis have been fully sequenced and annotated.
- The pX01 plasmid contains a distinct region associated with toxin genes, indicating potential horizontal gene transfer or a separate evolutionary path.
- These findings provide a foundation for further research into B. anthracis virulence mechanisms and potential therapeutic targets.