Supergene origin and maintenance in Atlantic cod.

Autor: Matschiner M; Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Oslo, Norway. michael.matschiner@nhm.uio.no.; Department of Palaeontology and Museum, University of Zurich, Zurich, Switzerland. michael.matschiner@nhm.uio.no.; Natural History Museum, University of Oslo, Oslo, Norway. michael.matschiner@nhm.uio.no., Barth JMI; Zoological Institute, Department of Environmental Sciences, University of Basel, Basel, Switzerland., Tørresen OK; Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Oslo, Norway., Star B; Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Oslo, Norway., Baalsrud HT; Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Oslo, Norway., Brieuc MSO; Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Oslo, Norway., Pampoulie C; Marine and Freshwater Research Institute, Hafnarfjördur, Iceland., Bradbury I; Fisheries and Oceans Canada, St John's, Newfoundland and Labrador, Canada., Jakobsen KS; Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Oslo, Norway., Jentoft S; Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Oslo, Norway. sissel.jentoft@ibv.uio.no.
Jazyk: angličtina
Zdroj: Nature ecology & evolution [Nat Ecol Evol] 2022 Apr; Vol. 6 (4), pp. 469-481. Date of Electronic Publication: 2022 Feb 17.
DOI: 10.1038/s41559-022-01661-x
Abstrakt: Supergenes are sets of genes that are inherited as a single marker and encode complex phenotypes through their joint action. They are identified in an increasing number of organisms, yet their origins and evolution remain enigmatic. In Atlantic cod, four megabase-scale supergenes have been identified and linked to migratory lifestyle and environmental adaptations. Here we investigate the origin and maintenance of these four supergenes through analysis of whole-genome-sequencing data, including a new long-read-based genome assembly for a non-migratory Atlantic cod individual. We corroborate the finding that chromosomal inversions underlie all four supergenes, and we show that they originated at different times between 0.40 and 1.66 million years ago. We reveal gene flux between supergene haplotypes where migratory and stationary Atlantic cod co-occur and conclude that this gene flux is driven by gene conversion, on the basis of an increase in GC content in exchanged sites. Additionally, we find evidence for double crossover between supergene haplotypes, leading to the exchange of an ~275 kilobase fragment with genes potentially involved in adaptation to low salinity in the Baltic Sea. Our results suggest that supergenes can be maintained over long timescales in the same way as hybridizing species, through the selective purging of introduced genetic variation.
(© 2022. The Author(s).)
Databáze: MEDLINE
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