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Identification of coryneform bacterial isolates by ribosomal DNA sequence analysis
Y W Tang1, A Von Graevenitz, M G Waddington
1Departments of Medicine and Pathology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA. yiwei.tang@vanderbilt.edu
Journal of Clinical Microbiology
|April 4, 2000
Summary
Accurate identification of coryneform bacteria is crucial for clinical decisions. The MicroSeq 500 16S rRNA gene sequencing kit shows promise for definitive species-level identification in clinical microbiology.
Area of Science:
- Clinical Microbiology
- Bacterial Genetics
- Molecular Diagnostics
Background:
- Accurate species-level identification of coryneform bacteria is essential for distinguishing contamination from true infection, guiding clinical interventions.
- Current phenotypic methods in clinical laboratories often prove inadequate for precise coryneform bacteria identification.
- The MicroSeq 500 16S bacterial sequencing kit offers a novel approach targeting the 16S rRNA gene for bacterial identification.
Purpose of the Study:
- To evaluate the performance of the MicroSeq 500 16S bacterial sequencing kit for species-level identification of coryneform bacteria.
- To compare the MicroSeq kit's accuracy against conventional and supplemented phenotypic identification methods.
- To assess the time efficiency of the MicroSeq sequencing method in a clinical microbiology setting.
Main Methods:
- Utilized the MicroSeq 500 16S bacterial sequencing kit to analyze the first 527 base pairs of the 16S rRNA gene.
- Tested 52 clinical isolates of coryneform gram-positive bacilli obtained from the Mayo Clinic.
- Compared sequencing results with conventional and supplemented phenotypic identification methods.
Main Results:
- MicroSeq achieved genus-level identification concordance for all isolates.
- Species-level concordance was observed for 64.3% of Corynebacterium isolates and 83.3% of related isolates.
- The kit accurately identified clinically significant Corynebacterium diphtheriae and Corynebacterium jeikeium, and identified species previously unresolvable by phenotypic methods.
Conclusions:
- The MicroSeq 500 16S bacterial sequencing kit demonstrates significant potential for definitive species-level identification of clinical coryneform bacteria.
- This molecular method offers improved accuracy over traditional phenotypic techniques for certain challenging isolates.
- The sequencing approach provides a valuable tool for enhancing diagnostic capabilities in clinical microbiology laboratories.