Assessing Serratia spp. pathogenic potential from cryogenic habitats

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Abstract

The genus Serratia are opportunistic bacteria widely spread in natural environment. At the same time, this bacterial genus consists of the species associated with outbreaks of nosocomial infections. Serratia species are found in extreme habitats, but pathogenic potential of polyextremophilic strains in this genus remains unexplored. The aim of this study was to compare the genomes of two Serratia strains isolated in polar regions, primarily examining genetic factors of virulence and adaptation to cryogenic environment. During the 56th Russian Antarctic Expedition the Serratia liquefaciens 72 strain was isolated from a guano sample of the Adelie Penguin (Pygoscelis adeliae) colony on Tokarev Island (Haswell Archipelago, East Antarctica). The Serratia fonticola 5l strain was isolated from the frozen carcass of moose (Alces alces) fossils found on the Buor-Khaya Peninsula near the Laptev Sea coast (Yakutia Region, Russia). The whole-genome sequencing of such strains allowed to reveal genetic structures evidencing about their successful adaptation to low temperatures. Thus, it was found that both genomes contain genes encoding the main cold shock proteins, phylogenetically close to the corresponding genes in the hypobarotolerant Serratia liquefaciens strain ATCC 27592. Furthermore, both strains bear a cluster of tc-fABCD genes determining the bacterial adhesion to epithelial tissues, and the genes for RTX toxins — adhesins, crucial factors of biofilm formation in pathogenic Gram-negative bacteria. Experimental studies confirmed the ability of Serratia liquefaciens 72 and Serratia fonticola 5l to actively form biofilms in a wide temperature range (from 6°C to 37°C). The results obtained indicate that the examined genus Serratia strains isolated in Arctica and Antarctica exert overall similar adaptation strategies to polar climate, including the ability to produce pili, show active adhesion, and biofilm formation under low temperatures. Genetic adaptive factors may also act as pathogenicity factors allowing extremotolerant Serratia strains to exert traits of opportunistic and nosocomial pathogens and spread via chilled food-borne transmission. The wide use of food technologies, such as cooling and vacuum sealing, can potentially create a new ecological niche favourable for selection of psychrotolerant and hypobarotolerant pathogens. The data obtained allow to raise a question about necessity of further studies to monitor genetic diversity among psychrophilic hypobarotolerant microbial populations possessing pathogenic and epidemic potential.

About the authors

A. E. Goncharov

Institute of Experimental Medicine; North-Western State Medical University named after I.I. Mechnikov; St. Petersburg State University

Author for correspondence.
Email: phage1@yandex.ru
ORCID iD: 0000-0002-5206-6656
https://iemspb.ru/department/microbiology/func-genomics-lab/

Artemiy E. Goncharov - PhD, MD (Medicine), Associate Professor, Head of the Laboratory of Functional Genomics and Proteomics of Microorganisms, Institute of Experimental Medicine; Professor of the Department of Epidemiology, Parasitology and Disinfectology, North-Western State Medical University named after I.I. Mechnikov; Associate Professor of the Department of Fundamental Problems of Medicine and Medical Technologies.

197376, St. Petersburg, Academic Pavlov str., 12.

Phone: +7 (812) 234-05-42

Россия

A. P. Solomenny

Institute of Ecology and Genetics of Microorganisms of the Russian Academy of Sciences Ural Branch

Email: solomen@iegm.ru

PhD (Biology), Senior Researcher, Laboratory of Water Microbiology, Institute of Ecology and Genetics of Microorganisms of the Russian Academy of Sciences Ural Branch.

Perm.

Россия

A. L. Panin

St. Petersburg Pasteur Institute; All-Russian Research Veterinary Institute of Poultry Science

Email: alp.1952@mail.ru

Researcher, Laboratory of Medical Bacteriology, St. Petersburg Pasteur Institute; Senior Researcher of the All-Russian Research Veterinary Institute of Poultry Science.

St. Petersburg.

Россия

S. E. Grigoriev

M.K. Ammosov North-Eastern Federal University

Email: g_semen@mail.ru

PhD (Biology), Head of the Laboratory “P.A. Lazarev Mammoth Museum”, M.K. Ammosov North-Eastern Federal University.

Yakutsk.

Россия

M. Yu. Cheprasov

M.K. Ammosov North-Eastern Federal University

Email: nohsho@mail.ru

PhD (Biology), Senior Researcher, Laboratory “P.A. Lazarev Mammoth Museum”, M.K. Ammosov North-Eastern Federal University.

Yakutsk.

Россия

Ya. A. Ahremenko

M.K. Ammosov North-Eastern Federal University

Email: yanalex2007@yandex.ru

PhD (Medicine), Associate Professor, Department of Histology and Microbiology of the Medical Institute, M.K. Ammosov North-Eastern Federal University.

Yakutsk.

Россия

V. V. Kolodzieva

North-Western State Medical University named after I.I. Mechnikov

Email: vika-el@yandex.ru

PhD (Medicine), Associate Professor, Department of Epidemiology, Parasitology and Disinfectology, North-Western State Medical University named after I.I. Mechnikov,.

St. Petersburg.

Россия

N. E. Goncharov

North-Western State Medical University named after I.I. Mechnikov; St. Petersburg Pasteur Institute

Email: n.goncharov@yahoo.com

Specialist of the 1st Category, Laboratory of Medical Bacteriology, St. Petersburg Pasteur Institute; Head Technician of the Department of Epidemiology, Parasitology and Disinfectology, North-Western State Medical University named after I.I. Mechnikov.

St. Petersburg.

Россия

L. A. Kraeva

St. Petersburg Pasteur Institute; Military Medical Academy named after S.M. Kirov

Email: lykraeva@yandex.ru

PhD, MD (Medicine), Head of the Laboratory of Medical Bacteriology, St. Petersburg Pasteur Institute; Professor of the Department of Microbiology, Military Medical Academy named after S.M. Kirov.

St. Petersburg.

Россия

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Copyright (c) 2021 Goncharov A.E., Solomenny A.P., Panin A.L., Grigoriev S.E., Cheprasov M.Y., Ahremenko Y.A., Kolodzieva V.V., Goncharov N.E., Kraeva L.A.

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