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Article

Gene Transfer Agent g5 Gene Reveals Bipolar and Endemic Distribution of Roseobacter Clade Members in Polar Coastal Seawater

by 1,2,3,*, 1 and 1
1
Key Laboratory for Polar Science, Polar Research Institute of China, Ministry of Natural Resources, Shanghai 200136, China
2
School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China
3
Antarctic Great Wall Ecology National Observation and Research Station, Polar Research Institute of China, Shanghai 201209, China
*
Author to whom correspondence should be addressed.
Academic Editors: Michael Wink and Thomas J. Trott
Received: 12 March 2022 / Revised: 7 May 2022 / Accepted: 12 May 2022 / Published: 14 May 2022
(This article belongs to the Special Issue Marine Nearshore Biodiversity)
The Roseobacter clade represents one of the most abundant groups of marine bacteria and plays important biogeochemical roles in marine environments. Roseobacter genomes commonly contain a conserved gene transfer agent (GTA) gene cluster. A major capsid protein-encoding GTA (g5) has been used as a genetic marker to estimate the diversity of marine roseobacters. Here, the diversity of roseobacters in the coastal seawater of Arctic Kongsfjorden and Antarctic Maxwell Bay was investigated based on g5 gene clone library analysis. Four g5 gene clone libraries were constructed from microbial assemblages representing Arctic and Antarctic regions. The genus Phaeobacter was exclusively detected in Arctic seawater, whereas the genera Jannaschia, Litoreibacter and Pacificibacter were only observed in Antarctic seawater. More diverse genera within the Roseobacter clade were observed in Antarctic clones than in Arctic clones. The genera Sulfitobacter, Loktanella and Yoonia were dominant (higher than 10% of total clones) in both Arctic and Antarctic samples, implying their roles in polar marine environments. The results not only indicated a bipolar or even global distribution of roseobacters in marine environments but also showed their endemic distribution either in the Arctic or Antarctic. Endemic phylotypes were more frequently observed in polar regions than cosmopolitan phylotypes. In addition, endemic phylotypes were more abundant in Arctic samples (84.8% of Arctic sequences) than in Antarctic samples (54.3% of Antarctic sequences). View Full-Text
Keywords: gene transfer agent; Roseobacter; diversity; distribution; Kongsfjorden; Maxwell Bay gene transfer agent; Roseobacter; diversity; distribution; Kongsfjorden; Maxwell Bay
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MDPI and ACS Style

Zeng, Y.-X.; Li, H.-R.; Luo, W. Gene Transfer Agent g5 Gene Reveals Bipolar and Endemic Distribution of Roseobacter Clade Members in Polar Coastal Seawater. Diversity 2022, 14, 392. https://0-doi-org.brum.beds.ac.uk/10.3390/d14050392

AMA Style

Zeng Y-X, Li H-R, Luo W. Gene Transfer Agent g5 Gene Reveals Bipolar and Endemic Distribution of Roseobacter Clade Members in Polar Coastal Seawater. Diversity. 2022; 14(5):392. https://0-doi-org.brum.beds.ac.uk/10.3390/d14050392

Chicago/Turabian Style

Zeng, Yin-Xin, Hui-Rong Li, and Wei Luo. 2022. "Gene Transfer Agent g5 Gene Reveals Bipolar and Endemic Distribution of Roseobacter Clade Members in Polar Coastal Seawater" Diversity 14, no. 5: 392. https://0-doi-org.brum.beds.ac.uk/10.3390/d14050392

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