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Nature ; 533(7602): 200-5, 2016 05 12.
Artigo em Inglês | MEDLINE | ID: mdl-27088604

RESUMO

The whole-genome duplication 80 million years ago of the common ancestor of salmonids (salmonid-specific fourth vertebrate whole-genome duplication, Ss4R) provides unique opportunities to learn about the evolutionary fate of a duplicated vertebrate genome in 70 extant lineages. Here we present a high-quality genome assembly for Atlantic salmon (Salmo salar), and show that large genomic reorganizations, coinciding with bursts of transposon-mediated repeat expansions, were crucial for the post-Ss4R rediploidization process. Comparisons of duplicate gene expression patterns across a wide range of tissues with orthologous genes from a pre-Ss4R outgroup unexpectedly demonstrate far more instances of neofunctionalization than subfunctionalization. Surprisingly, we find that genes that were retained as duplicates after the teleost-specific whole-genome duplication 320 million years ago were not more likely to be retained after the Ss4R, and that the duplicate retention was not influenced to a great extent by the nature of the predicted protein interactions of the gene products. Finally, we demonstrate that the Atlantic salmon assembly can serve as a reference sequence for the study of other salmonids for a range of purposes.


Assuntos
Diploide , Evolução Molecular , Duplicação Gênica/genética , Genes Duplicados/genética , Genoma/genética , Salmo salar/genética , Animais , Elementos de DNA Transponíveis/genética , Feminino , Genômica , Masculino , Modelos Genéticos , Mutagênese/genética , Filogenia , Padrões de Referência , Salmo salar/classificação , Homologia de Sequência
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