Abstract
The genus Idiomarina consists of halophilic and/or haloalkaliphilic organisms. We compared the complete genomes of seven strains of the genus Idiomarina to investigate its adaptation to saline environment. A total of 1,313 core genes related to salinity tolerance, stress response, antibiotic resistance genes, virulence factors, and drug targets were found. Comparative genomics revealed various genes involved in halo adaptations of these organisms, including transporters and influx or efflux systems for elements such as Fe, Cu, Zn, Pb, and Cd. In agreement with their isolation sources (such as hydrothermal vents and marine sediments) and environments abundant in heavy metals, various resistance proteins and transporters associated with metal tolerance were also identified. These included copper resistance proteins, zinc uptake transcriptional repressor Zur, MerC domain-containing protein, Cd(II)/Pb(II)-responsive transcriptional regulator, Co/Zn/Cd efflux system protein, and mercuric transporter. Interestingly, we observed that the carbohydrate metabolism pathways were incomplete in all the strains and transporters used for absorption of small sugars were also not found in them. Also, the presence of higher proportion of genes involved in protein metabolism than carbohydrate metabolism indicates that proteinaceous substrates act as the major food substrates for these bacterial strains than carbohydrates. Genomic islands were detected in some species, highlighting the role of horizontal gene transfer for acquisition in novel genes. Genomic rearrangements in terms of partially palindromic regions were detected in all strains. To our knowledge, this is the first comprehensive comparative genomics study among the genus Idiomarina revealing unique genomic features within bacterial species inhabiting different ecological niches.
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J.K. and J.K. thank Maitreyi College and Gargi College, University of Delhi for their constant support and encouragement.
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Kaur, J., Kaur, J. Comparative genomics of seven genomes of genus Idiomarina reveals important halo adaptations and genes for stress response. 3 Biotech 14, 40 (2024). https://doi.org/10.1007/s13205-023-03887-3
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DOI: https://doi.org/10.1007/s13205-023-03887-3