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Identification of genetic differences between two Campylobacter jejuni strains with different colonization potentials
If H Ahmed1, Georgina Manning1, Trudy M Wassenaar2,1
1Veterinary Laboratories Agency (Weybridge), New Haw, Addlestone, Surrey KT15 3NB, UK1.
Microbiology (Reading, England)
|April 5, 2002
Summary
Researchers identified specific Campylobacter jejuni genes linked to chicken gut colonization. This discovery aids in developing strategies to control Campylobacter in poultry, reducing human health risks from contaminated meat.
Area of Science:
- Microbiology
- Genomics
- Food Safety
Background:
- Campylobacter jejuni in poultry meat is a significant risk factor for human campylobacteriosis.
- Understanding Campylobacter colonization factors in chickens is crucial for developing control strategies.
- Strain NCTC 11168 exhibits poorer chicken gut colonization compared to strain 81116, suggesting genetic differences.
Purpose of the Study:
- To identify specific gene fragments present in a highly colonizing Campylobacter jejuni strain (81116) but absent in a poorly colonizing strain (NCTC 11168).
- To investigate potential genetic factors contributing to Campylobacter colonization in the avian gut.
Main Methods:
- Utilized subtractive hybridization, leveraging the available genome sequence of C. jejuni NCTC 11168.
- Screened for DNA inserts specific to the highly colonizing strain 81116.
- Confirmed strain-specific DNA inserts using Southern-blot analysis.
Main Results:
- Identified 24 gene fragments specific to the 81116 strain after subtractive hybridization.
- Several identified fragments showed similarities to known bacterial genes, including restriction-modification systems, arsenic resistance, and cytochrome c oxidase.
- Strain-dependent variations in these DNA inserts were confirmed.
Conclusions:
- Subtractive hybridization is effective in identifying genes absent in a sequenced Campylobacter jejuni strain.
- The identified genes may play a role in Campylobacter colonization of the chicken gut.
- Findings provide insights into the genetic basis of Campylobacter colonization, aiding future control efforts.