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Convergent evolution and horizontal gene transfer in Arctic Ocean microalgae.


ABSTRACT: 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.

SUBMITTER: Dorrell RG 

PROVIDER: S-EPMC9756366 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature

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Convergent evolution and horizontal gene transfer in Arctic Ocean microalgae.

Dorrell Richard G RG   Kuo Alan A   Füssy Zoltan Z   Richardson Elisabeth H EH   Salamov Asaf A   Zarevski Nikola N   Freyria Nastasia J NJ   Ibarbalz Federico M FM   Jenkins Jerry J   Pierella Karlusich Juan Jose JJ   Stecca Steindorff Andrei A   Edgar Robyn E RE   Handley Lori L   Lail Kathleen K   Lipzen Anna A   Lombard Vincent V   McFarlane John J   Nef Charlotte C   Novák Vanclová Anna Mg AM   Peng Yi Y   Plott Chris C   Potvin Marianne M   Vieira Fabio Rocha Jimenez FRJ   Barry Kerrie K   de Vargas Colomban C   Henrissat Bernard B   Pelletier Eric E   Schmutz Jeremy J   Wincker Patrick P   Dacks Joel B JB   Bowler Chris C   Grigoriev Igor V IV   Lovejoy Connie C  

Life science alliance 20221215 3


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 whethe  ...[more]

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