| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Fitness landscapes support the dominance theory of post-zygotic isolation in the mussels Mytilus edulis and M. galloprovincialis
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| Autores: |
Bierne, Nicolas
Bonhomme, Francois
Boudry, Pierre
Szulkin, M
David, Pierre
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| Data: |
2006-05
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| Ano: |
2006
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| Palavras-chave: |
Mytilus
Dobzhansky Muller incopatibilities
Post zygotic isolation
Negative epistasis
Hybrid breakdown
Hybrid zone
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| Resumo: |
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 F-2 cross, 36 h and 200 days after fertilization. Directional selection favouring M. galloprovincialis genotypes was observed in both kinds of cross. In the F-2, 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.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/2006/publication-1350.pdf
DOI:10.1098/rspb.2005.3440
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| Editor: |
Royal Society of London
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| Relação: |
http://archimer.ifremer.fr/doc/00000/1350/
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| Formato: |
application/pdf
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| Fonte: |
Proceedings of the Royal society of London (B) (Biological sciences) (0962-8452) (Royal Society of London), 2006-05 , Vol. 273 , N. 1591 , P. 1253-1260
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| Direitos: |
2006 The Royal Society
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