Genes · 2021

Associative Overdominance and Negative Epistasis Shape Genome-Wide Ancestry Landscape in Supplemented Fish Populations

Leitwein M, Cayuela H, Bernatchez L

The authors study domestic ancestry in lake populations of brook charr subject to stocking. Genomic profiles differ between populations and depend on the context of diversity and recombination. The work underlines the value of assessing the consequences of stocking population by population.

The question: Why is domestic ancestry distributed differently across the genomes of stocked populations?
The approach: Genotyping of 552 fish from 22 lake populations and analysis of mapped SNP markers, diversity and recombination.
What the article brings: Selection and drift may contribute to ancestry profiles specific to each population.
The limits: The mechanisms proposed are interpretations of the system studied; they do not support the conclusion that all stocking is beneficial or harmful.

Figures from the article

Figure 2, Associative Overdominance and Negative Epistasis Shape Genome-Wide Ancestry Landscape in Supplemented Fish Populations — Figure 2. Heatmap of the proportion of domestic ancestry rate along the 42 Brook Charr linkage groups (LGs) for each lake. Lakes are ordered as a function of stocking intensity (less stocked lakes at the bottom). Labels are detailed in Table 1 .Original caption. Leitwein M, Cayuela H, Bernatchez L (2021), Genes. CC BY 4.0

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Associative Overdominance and Negative Epistasis Shape Genome-Wide Ancestry Landscape in Supplemented Fish Populations

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