PT  - JOURNAL ARTICLE
AU  - Richard G Dorrell
AU  - Alan Kuo
AU  - Zoltan Füssy
AU  - Elisabeth H Richardson
AU  - Asaf Salamov
AU  - Nikola Zarevski
AU  - Nastasia J Freyria
AU  - Federico M Ibarbalz
AU  - Jerry Jenkins
AU  - Juan Jose Pierella Karlusich
AU  - Andrei Stecca Steindorff
AU  - Robyn E Edgar
AU  - Lori Handley
AU  - Kathleen Lail
AU  - Anna Lipzen
AU  - Vincent Lombard
AU  - John McFarlane
AU  - Charlotte Nef
AU  - Anna MG Novák Vanclová
AU  - Yi Peng
AU  - Chris Plott
AU  - Marianne Potvin
AU  - Fabio Rocha Jimenez Vieira
AU  - Kerrie Barry
AU  - Colomban de Vargas
AU  - Bernard Henrissat
AU  - Eric Pelletier
AU  - Jeremy Schmutz
AU  - Patrick Wincker
AU  - Joel B Dacks
AU  - Chris Bowler
AU  - Igor V Grigoriev
AU  - Connie Lovejoy
TI  - Convergent evolution and horizontal gene transfer in Arctic Ocean microalgae
AID  - 10.26508/lsa.202201833
DP  - 2023 Mar 01
TA  - Life Science Alliance
PG  - e202201833
VI  - 6
IP  - 3
4099  - https://www.life-science-alliance.org/content/6/3/e202201833.short
4100  - https://www.life-science-alliance.org/content/6/3/e202201833.full
SO  - Life Sci. Alliance2023 Mar 01; 6
AB  - Microbial communities in the world ocean are affected strongly by oceanic circulation, creating characteristic marine biomes. The high connectivity of most of the ocean makes it difficult to disentangle selective retention of colonizing genotypes (with traits suited to biome specific conditions) from evolutionary selection, which would act on founder genotypes over time. The Arctic Ocean is exceptional with limited exchange with other oceans and ice covered since the last ice age. To test whether Arctic microalgal lineages evolved apart from algae in the global ocean, we sequenced four lineages of microalgae isolated from Arctic waters and sea ice. Here we show convergent evolution and highlight geographically limited HGT as an ecological adaptive force in the form of PFAM complements and horizontal acquisition of key adaptive genes. Notably, ice-binding proteins were acquired and horizontally transferred among Arctic strains. A comparison with Tara Oceans metagenomes and metatranscriptomes confirmed mostly Arctic distributions of these IBPs. The phylogeny of Arctic-specific genes indicated that these events were independent of bacterial-sourced HGTs in Antarctic Southern Ocean microalgae.