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Large-scale genome sequencing reveals the driving forces of viruses in microalgal evolution
Sunday, 2021/01/17 | 07:03:42

David R. Nelson, Khaled M. Hazzouri, Kyle J. Lauersen, Ashish Jaiswal, Amphun Chaiboonchoe, Alexandra Mystikou, Weiqi Fu, Sarah Daakour, Bushra Dohai, Amnah Alzahmi, David Nobles, Mark Hurd, Julie Sexton, Michael J. Preston, Joan Blanchette, Michael W. Lomas, Khaled M.A. Amiri, Kourosh Salehi-Ashtiani.

 

Cell Host and Microbes; Published:January 11, 2021   DOI:https://doi.org/10.1016/j.chom.2020.12.005

 

Summary

Being integral primary producers in diverse ecosystems, microalgal genomes could be mined for ecological insights, but representative genome sequences are lacking for many phyla. We cultured and sequenced 107 microalgae species from 11 different phyla indigenous to varied geographies and climates. This collection was used to resolve genomic differences between saltwater and freshwater microalgae. Freshwater species showed domain-centric ontology enrichment for nuclear and nuclear membrane functions, while saltwater species were enriched in organellar and cellular membrane functions. Further, marine species contained significantly more viral families in their genomes (p = 8e–4). Sequences from Chlorovirus, Coccolithovirus, Pandoravirus, Marseillevirus, Tupanvirus, and other viruses were found integrated into the genomes of algal from marine environments. These viral-origin sequences were found to be expressed and code for a wide variety of functions. Together, this study comprehensively defines the expanse of protein-coding and viral elements in microalgal genomes and posits a unified adaptive strategy for algal halotolerance.

 

See https://www.cell.com/cell-host-microbe/fulltext/S1931-3128(20)30667-3

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