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Physical map of the Clostridium difficile chromosome
1Department of Biological Sciences, Lehigh University, Bethlehem, PA 18015, USA.
Gene
|December 31, 1997
Summary
This study maps the Clostridium difficile chromosome, revealing its organization. Understanding this structure helps explain how toxigenic strains cause disease, differentiating them from non-toxigenic strains.
Area of Science:
- Microbiology
- Genomics
- Molecular Biology
Background:
- Clostridium difficile causes antibiotic-induced diarrhea and colitis.
- Toxin A and B genes determine C. difficile pathogenicity.
- Toxigenic and non-toxigenic strains exhibit distinct chromosomal organization.
Purpose of the Study:
- To investigate the chromosomal organization of a reference toxigenic C. difficile strain.
- To generate a physical map of the C. difficile ATCC 43594 chromosome.
Main Methods:
- Pulsed field gel electrophoresis (PFGE) was used for chromosome mapping.
- Restriction digestion with NruI and SacII enzymes.
- Probing with PCR-generated DNA fragments to locate genes.
Main Results:
- PFGE generated macrofragment profiles for NruI and SacII digests.
- A restriction map was constructed by analyzing fragment locations.
- Seven genes were mapped onto the C. difficile chromosome.
- The approximate chromosome size was determined to be 4.4 Mb.
Conclusions:
- The study provides a detailed physical map of the C. difficile chromosome.
- This chromosomal map aids in understanding strain differentiation and pathogenicity.
- Further research can utilize this map for comparative genomics and virulence studies.