Genomic Comparison of Deep-Sea Hydrothermal Genera Related to Aeropyrum, Thermodiscus and Caldisphaera, and Proposed Emended Description of the Family Acidilobaceae
Sponsor
This work was supported by the US-National Science Foundation grants OCE-1558795, OCE-1235432, OCE-0937404 and DEB-2409507 to A.-L. R. Sequencing for several samples was provided by the Department of Energy Joint Genome.
Published In
Systematic and Applied Microbiology
Document Type
Citation
Publication Date
4-26-2024
Abstract
Deep-sea hydrothermal vents host archaeal and bacterial thermophilic communities, including taxonomically and functionally diverse Thermoproteota. Despite their prevalence in high-temperature submarine communities, Thermoproteota are chronically under-represented in genomic databases and issues have emerged regarding their nomenclature, particularly within the Aeropyrum-Thermodiscus-Caldisphaera. To resolve some of these problems, we identified 47 metagenome-assembled genomes (MAGs) within this clade, from 20 previously published deep-sea hydrothermal vent and submarine volcano metagenomes, and 24 MAGs from public databases. Using phylogenomic analysis, Genome Taxonomy Database Toolkit (GTDB-Tk) taxonomic assessment, 16S rRNA gene phylogeny, average amino acid identity (AAI) and functional gene patterns, we re-evaluated of the taxonomy of the Aeropyrum-Thermodiscus-Caldisphaera. At least nine genus-level clades were identified with two or more MAGs. In accordance with SeqCode requirements and recommendations, we propose names for three novel genera, viz. Tiamatella incendiivivens, Hestiella acidicharens and Calypsonella navitae. A fourth genus was also identified related to Thermodiscus maritimus, for which no available sequenced genome exists. We propose the novel species Thermodiscus eudorianus to describe our high-quality Thermodiscus MAG, which represents the type genome for the genus. All three novel genera and T. eudorianus are likely anaerobic heterotrophs, capable of fermenting protein-rich carbon sources, while some Tiamatella, Calypsonella and T. eudorianus may also reduce polysulfides, thiosulfate, sulfur and/or selenite, and the likely acidophile, Hestiella, may reduce nitrate and/or perchlorate. Based on phylogenomic evidence, we also propose the family Acidilobaceae be amended to include Caldisphaera, Aeropyrum, Thermodiscus and Stetteria and the novel genera described here.
Rights
© 2024 Elsevier GmbH. All rights reserved.
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DOI
10.1016/j.syapm.2024.126507
Persistent Identifier
https://archives.pdx.edu/ds/psu/42005
Citation Details
St. John, E., & Reysenbach, A.-L. (2024). Genomic comparison of deep-sea hydrothermal genera related to Aeropyrum, Thermodiscus and Caldisphaera, and proposed emended description of the family Acidilobaceae. Systematic and Applied Microbiology, 47(2–3), 126507.