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>>A GENOME TALE OF 80 MILLION YEARS

The duplicated Atlantic salmon genome. Homeologous regions in the Atlantic salmon genome subdivided into 98 collinear blocks along the 29 European Atlantic salmon chromosomes. Red rectangles represent blocks of sequence without identifiable duplicated regions elsewhere in the genome.

The duplicated Atlantic salmon genome. Homeologous regions in the Atlantic salmon genome subdivided into 98 collinear blocks along the 29 European Atlantic salmon chromosomes. Red rectangles represent blocks of sequence without identifiable duplicated regions elsewhere in the genome.

 [genome sequencing] "The 22,000-year-old cave painting of an Atlantic salmon (Salmo salar) near the Vézère River in France is a reminder of our fascination with,and dependence on, Atlantic salmon throughout human history," writes researchers from Norway, Canada and Chile after concluding the great salmon genome sequencing in 2014. Two years later, in 2016, the key findings are published in Nature.

 

These are key points :

  • The whole-genome duplication 80 million years ago of the common ancestor of salmonids provides unique opportunities to learn about the evolutionary fate of a duplicated vertebrate genome in 70 extant lineages.
  • A high-quality genome assembly for Atlanticsalmon (Salmo salar) 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.
  • 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.
  • The Atlantic salmon assembly can serve as a reference sequence for the study of other salmonids for a range of purposes.

Read the whole Nature article here!

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