Abstract
Phage resistance is crucial for lactic acid bacteria in the dairy industry. However, identifying all phages affecting these bacteria is challenging. CRISPR-Cas systems offer a resistance mechanism developed by bacteria and archaea against phages and plasmids. In this study, 11 S. thermophilus strains from traditional yogurts underwent analysis using next-generation sequencing (NGS) and bioinformatics tools. Initial characterization involved molecular ribotyping. Bioinformatics analysis of the NGS raw data revealed that all 11 strains possessed at least one CRISPR type. A total of 21 CRISPR loci were identified, belonging to CRISPR types II-A, II-C, and III-A, including 13 Type II-A, 1 Type III-C, and 7 Type III-A CRISPR types. By analyzing spacer sequences in S. thermophilus bacterial genomes and matching them with phage/plasmid genomes, notable strains emerged. SY9 showed prominence with 132 phage matches and 30 plasmid matches, followed by SY12 with 35 phage matches and 25 plasmid matches, and SY18 with 49 phage matches and 13 plasmid matches. These findings indicate the potential of S. thermophilus strains in phage/plasmid resistance for selecting starter cultures, ultimately improving the quality and quantity of dairy products. Nevertheless, further research is required to validate these results and explore the practical applications of this approach.
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[Ali ÖZCAN]: Research design, data collection and analysis, writing and editing of the manuscript. [Deniz KİRAZ]: Literature review, data analysis, interpretation of results, revision of the manuscript. [Özge Kahraman ILIKKAN]: Statistical analysis, design of methods, proofreading of the manuscript. [Artun YIBAR]: Supervision, guiding the research process, final revision.
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Özcan, A., Yıbar, A., Kiraz, D. et al. Comprehensive analysis of the CRISPR-Cas systems in Streptococcus thermophilus strains isolated from traditional yogurts. Antonie van Leeuwenhoek 117, 63 (2024). https://doi.org/10.1007/s10482-024-01960-2
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DOI: https://doi.org/10.1007/s10482-024-01960-2