Drug-Resistant Staphylococcus aureus Strains Reveal Distinct Biochemical Features with Raman MicrospectroscopyClick to copy article linkArticle link copied!
- Oscar D. AyalaOscar D. AyalaBiophotonics Center, Vanderbilt University, 410 24th Avenue South, Nashville, Tennessee 37235, United StatesDepartment of Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, Nashville, Tennessee 37232, United StatesMore by Oscar D. Ayala
- Catherine A. WakemanCatherine A. WakemanDepartment of Biological Sciences, Texas Tech University, 2901 Main Street, Lubbock, Texas 79409, United StatesMore by Catherine A. Wakeman
- Isaac J. PenceIsaac J. PenceBiophotonics Center, Vanderbilt University, 410 24th Avenue South, Nashville, Tennessee 37235, United StatesDepartment of Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, Nashville, Tennessee 37232, United StatesMore by Isaac J. Pence
- Jennifer A. GaddyJennifer A. GaddyDepartment of Medicine, Division of Infectious Diseases, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North, Nashville, Tennessee 37232, United StatesDepartment of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North, Nashville, Tennessee 37232, United StatesTennessee Valley Healthcare Systems, Department of Veterans Affairs, 1310 24th Avenue South, Nashville, Tennessee 37212, United StatesMore by Jennifer A. Gaddy
- James C. SlaughterJames C. SlaughterDepartment of Biostatistics, Vanderbilt University School of Medicine, 2525 West End Avenue, Suite 11000, Nashville, Tennessee 37203, United StatesMore by James C. Slaughter
- Eric P. SkaarEric P. SkaarDepartment of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, 1161 21st Avenue South, Medical Center North, Nashville, Tennessee 37232, United StatesMore by Eric P. Skaar
- Anita Mahadevan-Jansen*Anita Mahadevan-Jansen*E-mail: [email protected]Biophotonics Center, Vanderbilt University, 410 24th Avenue South, Nashville, Tennessee 37235, United StatesDepartment of Biomedical Engineering, Vanderbilt University, 5824 Stevenson Center, Nashville, Tennessee 37232, United StatesMore by Anita Mahadevan-Jansen
Abstract
Staphylococcus aureus (S. aureus) is a leading cause of hospital-acquired infections, such as bacteremia, pneumonia, and endocarditis. Treatment of these infections can be challenging since strains of S. aureus, such as methicillin-resistant S. aureus (MRSA), have evolved resistance to antimicrobials. Current methods to identify infectious agents in hospital environments often rely on time-consuming, multistep culturing techniques to distinguish problematic strains (i.e., antimicrobial resistant variants) of a particular bacterial species. Therefore, a need exists for a rapid, label-free technique to identify drug-resistant bacterial strains to guide proper antibiotic treatment. Here, our findings demonstrate the ability to characterize and identify microbes at the subspecies level using Raman microspectroscopy, which probes the vibrational modes of molecules to provide a biochemical “fingerprint”. This technique can distinguish between different isolates of species such as Streptococcus agalactiae and S. aureus. To determine the ability of this analytical approach to detect drug-resistant bacteria, isogenic variants of S. aureus including the comparison of strains lacking or expressing antibiotic resistance determinants were evaluated. Spectral variations observed may be associated with biochemical components such as amino acids, carotenoids, and lipids. Mutants lacking carotenoid production were distinguished from wild-type S. aureus and other strain variants. Furthermore, spectral biomarkers of S. aureus isogenic bacterial strains were identified. These results demonstrate the feasibility of Raman microspectroscopy for distinguishing between various genetically distinct forms of a single bacterial species in situ. This is important for detecting antibiotic-resistant strains of bacteria and indicates the potential for future identification of other multidrug resistant pathogens with this technique.
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