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Ilinov A, Nishiyama A, Namba H, Fukushima Y, Takihara H, Nakajima C, Savitskaya A, Gebretsadik G, Hakamata M, Ozeki Y, Tateishi Y, Okuda S, Suzuki Y, Vinnik YS, Matsumoto S. Extracellular DNA of slow growers of mycobacteria and its contribution to biofilm formation and drug tolerance. Sci Rep 2021; 11:10953. [PMID: 34040029 PMCID: PMC8155028 DOI: 10.1038/s41598-021-90156-z] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 04/30/2021] [Indexed: 12/29/2022] Open
Abstract
DNA is basically an intracellular molecule that stores genetic information and carries instructions for growth and reproduction in all cellular organisms. However, in some bacteria, DNA has additional roles outside the cells as extracellular DNA (eDNA), which is an essential component of biofilm formation and hence antibiotic tolerance. Mycobacteria include life-threating human pathogens, most of which are slow growers. However, little is known about the nature of pathogenic mycobacteria’s eDNA. Here we found that eDNA is present in slow-growing mycobacterial pathogens, such as Mycobacterium tuberculosis, M. intracellulare, and M. avium at exponential growth phase. In contrast, eDNA is little in all tested rapid-growing mycobacteria. The physiological impact of disrupted eDNA on slow-growing mycobacteria include reduced pellicle formation, floating biofilm, and enhanced susceptibility to isoniazid and amikacin. Isolation and sequencing of eDNA revealed that it is identical to the genomic DNA in M. tuberculosis and M. intracellulare. In contrast, accumulation of phage DNA in eDNA of M. avium, suggests that the DNA released differs among mycobacterial species. Our data show important functions of eDNA necessary for biofilm formation and drug tolerance in slow-growing mycobacteria.
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Affiliation(s)
- Aleksandr Ilinov
- Department of Bacteriology, Niigata University School of Medicine, 1-757, Asahimachi-Dori, Chuo-ku, Niigata, Niigata, 951-9510, Japan. .,Department of General Surgery Named Professor M.I. Gulman, Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, 1, P. Zheleznyaka str., Krasnoyarsk, Russian Federation, 660022.
| | - Akihito Nishiyama
- Department of Bacteriology, Niigata University School of Medicine, 1-757, Asahimachi-Dori, Chuo-ku, Niigata, Niigata, 951-9510, Japan
| | - Hiroki Namba
- Department of Bacteriology, Niigata University School of Medicine, 1-757, Asahimachi-Dori, Chuo-ku, Niigata, Niigata, 951-9510, Japan
| | - Yukari Fukushima
- Division of Bioresources, Hokkaido University Research Center for Zoonosis Control, Sapporo, 011-0020, Japan
| | - Hayato Takihara
- Division of Bioinformatics, Niigata University School of Medicine, 1-757, Asahimachi-Dori, Chuo-ku, Niigata, Niigata, 951-9510, Japan
| | - Chie Nakajima
- Division of Bioresources, Hokkaido University Research Center for Zoonosis Control, Sapporo, 011-0020, Japan.,International Collaboration Unit, Hokkaido University Research Center for Zoonosis Control, Sapporo, 011-0020, Japan.,Department of Advanced Pharmaceutics, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, 060-0818, Japan
| | - Anna Savitskaya
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation, 117997
| | - Gebremichal Gebretsadik
- Department of Bacteriology, Niigata University School of Medicine, 1-757, Asahimachi-Dori, Chuo-ku, Niigata, Niigata, 951-9510, Japan
| | - Mariko Hakamata
- Department of Bacteriology, Niigata University School of Medicine, 1-757, Asahimachi-Dori, Chuo-ku, Niigata, Niigata, 951-9510, Japan.,Department of Respiratory Medicine and Infectious Disease, Niigata Graduate School of Medical and Dental Sciences, 1-757, Asahimachi-Dori, Chuo-ku, Niigata, Niigata, 951-9510, Japan
| | - Yuriko Ozeki
- Department of Bacteriology, Niigata University School of Medicine, 1-757, Asahimachi-Dori, Chuo-ku, Niigata, Niigata, 951-9510, Japan
| | - Yoshitaka Tateishi
- Department of Bacteriology, Niigata University School of Medicine, 1-757, Asahimachi-Dori, Chuo-ku, Niigata, Niigata, 951-9510, Japan
| | - Shujiro Okuda
- Division of Bioinformatics, Niigata University School of Medicine, 1-757, Asahimachi-Dori, Chuo-ku, Niigata, Niigata, 951-9510, Japan
| | - Yasuhiko Suzuki
- Division of Bioresources, Hokkaido University Research Center for Zoonosis Control, Sapporo, 011-0020, Japan.,International Collaboration Unit, Hokkaido University Research Center for Zoonosis Control, Sapporo, 011-0020, Japan.,Department of Advanced Pharmaceutics, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, 060-0818, Japan
| | - Yuri S Vinnik
- Department of General Surgery Named Professor M.I. Gulman, Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, 1, P. Zheleznyaka str., Krasnoyarsk, Russian Federation, 660022
| | - Sohkichi Matsumoto
- Department of Bacteriology, Niigata University School of Medicine, 1-757, Asahimachi-Dori, Chuo-ku, Niigata, Niigata, 951-9510, Japan. .,Laboratory of Tuberculosis, Institute of Tropical Disease, Universitas Airlangga, Kampus C Jl. Mulyorejo, Surabaya, 60115, Indonesia.
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