Osuna-Cruz, C. M., Bilcke, G., Vancaester, E., De Decker, S., Poulsen, N., Bulankova, P., Verhelst, B., Audoor, S., Stojanovova, D., Pargana, A., Russo, M., Stock, F., Cirri, E., Brembu, T., Pohnert, G., Winge, P., Bones, A. M., Piganeu, G., Ferrante, M. I., Mock, T., Sterck, L., Sabbe, K., De Veylder, L., Vyverman, W. and Vandepoele, K. (2020). Nature Communications, 11 (1), 3320.

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

Benthic diatoms are the main primary producers in shallow freshwater and coastal environments. Here, they fulfill important ecological functions such as nutrient cycling and sediment stabilization. However, little is known about their evolutionary adaptations to these heterogeneous environments. 

In this study, we report a reference genome for the marine biofilm-forming diatom Seminavis robusta. Our analyses show that gene family expansions are responsible for a quarter of all 36,254 protein-coding genes. In addition, tandem duplications play a key role in extending the repertoire of specific gene functions. These include light and oxygen sensing, which are probably central for S. robusta’s adaptation to benthic habitats. In addition, 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. [Full publication]