Fitness landscapes support the dominance theory of post-zygotic isolation in the mussels Mytilus edulis and M. galloprovincialis

We studied the genetic basis of post-zygotic isolation in the marine mussels Mytilus edulis and Mytilus galloprovincialis. Evidence was obtained for a high number of recessive Dobzhansky-Muller substitutions in the genome of these two mussel taxa. We analysed the segregation of unlinked diagnostic m...

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Bibliographic Details
Published in:Proceedings of the Royal Society. B, Biological sciences Biological sciences, 2006-05, Vol.273 (1591), p.1253-1260
Main Authors: Bierne, Nicolas, Bonhomme, François, Boudry, Pierre, Szulkin, Marta, David, Patrice
Format: Article
Language:English
Subjects:
Animals
Biodiversity and Ecology
Dobzhansky-Muller Incompatibilities
Environmental Sciences
Evolution
Evolutionary genetics
Genetic loci
Genotype
Genotypes
Hybrid Breakdown
Hybrid Zone
Hybridity
Hybridization, Genetic
Inbreeding
Larvae
Larval development
Linkage Disequilibrium
Marine
Models, Genetic
Mortality
Mussels
Mytilus
Mytilus - genetics
Mytilus - physiology
Mytilus edulis
Mytilus edulis - genetics
Mytilus edulis - physiology
Mytilus galloprovincialis
Negative Epistasis
Population genetics
Post-Zygotic Isolation
Selection, Genetic
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Summary:We studied the genetic basis of post-zygotic isolation in the marine mussels Mytilus edulis and Mytilus galloprovincialis. Evidence was obtained for a high number of recessive Dobzhansky-Muller substitutions in the genome of these two mussel taxa. We analysed the segregation of unlinked diagnostic markers in the progeny of two backcrosses and an F2 cross, 36 h and 200 days after fertilization. Directional selection favouring M. galloprovincialis genotypes was observed in both kinds of cross. In the F2, epistatic interactions between each pair of chromosome fragments mapped by the markers were identified in addition. Our results imply that homozygous-homozygous interactions are required for breakdown of coadaptation, in accordance with the dominance theory of post-zygotic isolation. Endogenous post-zygotic selection distributed over many loci throughout the genome provides the missing factor explaining the astonishing persistence and strength of barriers to neutral introgression in such a dispersive taxon as Mytilus.
ISSN:0962-8452
1471-2954
DOI:10.1098/rspb.2005.3440