The Seminavis robusta genome provides insights into the evolutionary adaptations of benthic diatoms

Cristina Maria Osuna-Cruz, Gust Bilcke, Emmelien Vancaester, Sam De Decker, Atle M. Bones, Per Winge, Nicole Poulsen, Petra Bulankova, Bram Verhelst, Sien Audoor, Darja Belisova, Aikaterini Pargana, Monia Russo, Frederike Stock, Emilio Cirri, Tore Brembu, Georg Pohnert, Gwenael Piganeau, Maria Immacolata Ferrante, Thomas MockLieven Sterck, Koen Sabbe, Lieven De Veylder, Wim Vyverman, Klaas Vandepoele

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Benthic diatoms are the main primary producers in shallow freshwater and coastal environments, fulfilling important ecological functions such as nutrient cycling and sediment stabilization. However, little is known about their evolutionary adaptations to these highly structured but heterogeneous environments. Here, we report a reference genome for the marine biofilm-forming diatom Seminavis robusta, showing that gene family expansions are responsible for a quarter of all 36,254 protein-coding genes. Tandem duplications play a key role in extending the repertoire of specific gene functions, including light and oxygen sensing, which are probably central for its adaptation to benthic habitats. Genes differentially expressed during interactions with bacteria are strongly conserved in other benthic diatoms while many species-specific genes are strongly upregulated during sexual reproduction. Combined with re-sequencing data from 48 strains, our results offer insights into the genetic diversity and gene functions in benthic diatoms.

Original languageEnglish
Article number3320
JournalNature Communications
Early online date3 Jul 2020
Publication statusPublished - 3 Jul 2020

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