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Title: Biodiversity of magnetotactic bacteria in the tropical marine environment of Singapore revealed by metagenomic analysis
Authors: Tan, Shi Ming
Muhammad Hafiz Ismail
Cao, Bin
Keywords: Science::Biological sciences::Microbiology::Bacteria
Science::Biological sciences::Microbiology::Microbial ecology
Issue Date: 2021
Source: Tan, S. M., Muhammad Hafiz Ismail, & Cao, B. (2021). Biodiversity of magnetotactic bacteria in the tropical marine environment of Singapore revealed by metagenomic analysis. Environmental Research, 194, 110714-. doi:10.1016/j.envres.2021.110714
Journal: Environmental Research 
Abstract: Most studies on the diversity of magnetotactic bacteria (MTB) have been conducted on samples obtained from the Northern or the Southern hemispheres. The diversity of MTB in tropical Asia near the geo-equator, with a close-to-zero geomagnetic inclination, weak magnetic field and constantly high seawater temperature has never been explored. This study aims to decipher the diversity of MTB in the marine environment of Singapore through shotgun metagenomics. Although MTB has been acknowledged to be ubiquitous in aquatic environments, we did not observe magnetotactic behaviour in the samples. However, we detected the presence and determined the diversity of MTB through bioinformatic analyses. Metagenomic analysis suggested majority of the MTB in the seafloor sediments represents novel MTB taxa that cannot be classified at the species level. The relative abundance of MTB (∼0.2-1.69%) in the samples collected from the marine environment of Singapore was found to be substantially lower than studies for other regions. In contrast to other studies, the genera Magnetovibrio and Desulfamplus, but not Magnetococcus, were the dominant MTB. Additionally, we recovered 3 MTB genomic bins that are unclassified at the species level, with Magnetovibrio blakemorei being the closest-associated genome. All the recovered genomic bins contain homologs of at least 5 of the 7 mam genes but lack homologs for mamI, a membrane protein suggested to take part in the magenetosome invagination. This study fills in the knowledge gap of MTB biodiversity in the tropical marine environment near the geo-equator. Our findings will facilitate future research efforts aiming to unravel the ecological roles of MTB in the tropical marine environments as well as to bioprospecting novel MTB that have been adapted to tropical marine environments for biotechnological applications.
ISSN: 0013-9351
DOI: 10.1016/j.envres.2021.110714
Rights: © 2021 Elsevier Inc. All rights reserved. This paper was published in Environmental Research and is made available with permission of Elsevier Inc.
Fulltext Permission: embargo_20230331
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
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