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Quantitative oligonucleotide microarray fingerprinting of Salmonella enterica isolates
Alan Willse1, Timothy M Straub, Sharon C Wunschel
1Statistics and Quantitative Sciences Group, Pacific Northwest National Laboratory, Richland, WA 99352, USA.
Nucleic Acids Research
|March 24, 2004
Summary
A new genome-independent microbial fingerprinting method uses nucleic acid microarrays to distinguish closely related Salmonella strains. This high-resolution technique shows promise for microbial forensics and epidemiology applications.
Area of Science:
- Microbiology
- Genomics
- Forensic Science
Background:
- Microbial forensics and epidemiology require methods to differentiate closely related microorganisms.
- Current methods may be limited in resolution or depend on specific genomic information.
Purpose of the Study:
- To develop and validate a genome-independent microbial fingerprinting method using nucleic acid microarrays.
- To assess the method's ability to differentiate closely related Salmonella enterica strains.
Main Methods:
- Utilized a 192-probe nonamer microarray to create a fingerprint library.
- Employed a modified Hotelling T2 test to statistically compare isolate fingerprints.
- Controlled for multiple testing using a false discovery rate at alpha = 0.05.
Main Results:
- Successfully constructed a fingerprint library from 25 closely related Salmonella isolates.
- Demonstrated high-resolution differentiation, with at least 295 of 300 pairs found statistically distinct.
- Confirmed the method's effectiveness in distinguishing between highly similar microbial strains.
Conclusions:
- The nucleic acid microarray method offers a robust, genome-independent approach for microbial fingerprinting.
- This technique shows significant potential for applications in microbial forensics and epidemiology.
- Further development is needed to establish protocols for library construction and microbial classification.