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Tsuchihashi H, Ichikawa A, Takeda M, Koizumi A, Mizoguchi C, Ishida T, Kimura K. Genetic diversity of Lactobacillus delbrueckii isolated from raw milk in Hokkaido, Japan. J Dairy Sci 2021; 105:2082-2093. [PMID: 34955279 DOI: 10.3168/jds.2021-21135] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 11/03/2021] [Indexed: 11/19/2022]
Abstract
Lactic acid bacteria (LAB) play important roles in acid production and flavor formation in fermented dairy products. Lactic acid bacteria strains with distinct characteristics confer unique features to products. Diverse LAB have been identified in raw milk and traditional fermented milk prepared from raw milk. However, little is known about LAB in raw milk in Japan. To preserve diverse LAB as potential starters or probiotics for future use, we have isolated and identified various kinds of LAB from raw milk produced in Japan. In this study, we focused on Lactobacillus delbrueckii, one of the most important species in the dairy industry. We identified L. delbrueckii subspecies isolated from raw milk in Hokkaido, Japan, by analyzing intraspecific diversity using 4 distinct methods, hsp60 cluster analysis, multilocus sequence analysis, core-genome analysis, and whole-genome analysis based on average nucleotide identity. The subspecies distribution and a new dominant subset of L. delbrueckii from raw milk in Japan were revealed. The discovery of new strains with different genotypes is important for understanding the geographic distribution and characteristics of the bacteria and further their use as a microbial resource with the potential to express unconventional flavors and functionalities. The strains identified in this study may have practical applications in the development of fermented dairy products.
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Affiliation(s)
- H Tsuchihashi
- Basic Microbiology Research Department, Food Microbiology Research Laboratories, R&D Division, Meiji Co. Ltd., Hachioji, Tokyo 192-0919, Japan.
| | - A Ichikawa
- Basic Microbiology Research Department, Food Microbiology Research Laboratories, R&D Division, Meiji Co. Ltd., Hachioji, Tokyo 192-0919, Japan
| | - M Takeda
- Basic Microbiology Research Department, Food Microbiology Research Laboratories, R&D Division, Meiji Co. Ltd., Hachioji, Tokyo 192-0919, Japan
| | - A Koizumi
- Basic Microbiology Research Department, Food Microbiology Research Laboratories, R&D Division, Meiji Co. Ltd., Hachioji, Tokyo 192-0919, Japan
| | - C Mizoguchi
- Applied Microbiology Research Department, Food Microbiology Research Laboratories, R&D Division, Meiji Co. Ltd., Hachioji, Tokyo 192-0919, Japan
| | - T Ishida
- Basic Microbiology Research Department, Food Microbiology Research Laboratories, R&D Division, Meiji Co. Ltd., Hachioji, Tokyo 192-0919, Japan
| | - K Kimura
- Basic Microbiology Research Department, Food Microbiology Research Laboratories, R&D Division, Meiji Co. Ltd., Hachioji, Tokyo 192-0919, Japan
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Mowlaboccus S, Jolley KA, Bray JE, Pang S, Lee YT, Bew JD, Speers DJ, Keil AD, Coombs GW, Kahler CM. Clonal Expansion of New Penicillin-Resistant Clade of Neisseria meningitidis Serogroup W Clonal Complex 11, Australia. Emerg Infect Dis 2017; 23:1364-1367. [PMID: 28609259 PMCID: PMC5547816 DOI: 10.3201/eid2308.170259] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
In Western Australia, Neisseria meningitidis serogroup W clonal complex 11 became the predominant cause of invasive meningococcal disease in 2016. We used core-genome analysis to show emergence of a penicillin-resistant clade that had the penA_253 allele. This new penicillin-resistant clade might affect treatment regimens for this disease.
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