The genetic basis of a recent transition to live-bearing in marine snails

Author:

Stankowski Sean123ORCID,Zagrodzka Zuzanna B.1ORCID,Garlovsky Martin D.4ORCID,Pal Arka2ORCID,Shipilina Daria25,Castillo Diego Garcia2ORCID,Lifchitz Hila2ORCID,Le Moan Alan67,Leder Erica78ORCID,Reeve James7ORCID,Johannesson Kerstin7,Westram Anja M.29ORCID,Butlin Roger K.17ORCID

Affiliation:

1. Ecology and Evolutionary Biology, School of Biosciences, University of Sheffield, Sheffield S10 2TN, UK.

2. Institute of Science and Technology Austria (ISTA), 3400 Klosterneuburg, Austria.

3. Department of Ecology and Evolution, University of Sussex, Brighton BN1 9RH, UK.

4. Department of Applied Zoology, Faculty of Biology, Technische Universität Dresden, 01069 Dresden, Germany.

5. Department of Ecology and Genetics, Program of Evolutionary Biology, Uppsala University, SE-752 36 Uppsala, Sweden.

6. CNRS and Sorbonne Université, Station Biologique de Roscoff, 29680 Roscoff, France.

7. Department of Marine Sciences, Tjärnö Marine Laboratory, University of Gothenburg, 452 96 Strömstad, Sweden.

8. Natural History Museum, University of Oslo, 0562 Oslo, Norway.

9. Faculty of Biosciences and Aquaculture, Nord University, N-8049 Bodø, Norway.

Abstract

Key innovations are fundamental to biological diversification, but their genetic basis is poorly understood. A recent transition from egg-laying to live-bearing in marine snails ( Littorina spp.) provides the opportunity to study the genetic architecture of an innovation that has evolved repeatedly across animals. Individuals do not cluster by reproductive mode in a genome-wide phylogeny, but local genealogical analysis revealed numerous small genomic regions where all live-bearers carry the same core haplotype. Candidate regions show evidence for live-bearer–specific positive selection and are enriched for genes that are differentially expressed between egg-laying and live-bearing reproductive systems. Ages of selective sweeps suggest that live-bearer–specific alleles accumulated over more than 200,000 generations. Our results suggest that new functions evolve through the recruitment of many alleles rather than in a single evolutionary step.

Publisher

American Association for the Advancement of Science (AAAS)

Reference79 articles.

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