Faster-X effects in two Drosophila lineages.

Avila, Victoria, Marion de Procé, Sophie ORCID: 0000-0001-5324-7312, Campos, José L, Borthwick, Helen, Charlesworth, Brian and Betancourt, Andrea J ORCID: 0000-0001-9351-1413
(2014) Faster-X effects in two Drosophila lineages. Genome biology and evolution, 6 (10). pp. 2968-2982.

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Under certain circumstances, X-linked loci are expected to experience more adaptive substitutions than similar autosomal loci. To look for evidence of faster-X evolution, we analyzed the evolutionary rates of coding sequences in two sets of Drosophila species, the melanogaster and pseudoobscura clades, using whole-genome sequences. One of these, the pseudoobscura clade, contains a centric fusion between the ancestral X chromosome and the autosomal arm homologous to 3L in D. melanogaster. This offers an opportunity to study the same loci in both an X-linked and an autosomal context, and to compare these loci with those that are only X-linked or only autosomal. We therefore investigated these clades for evidence of faster-X evolution with respect to nonsynonymous substitutions, finding mixed results. Overall, there was consistent evidence for a faster-X effect in the melanogaster clade, but not in the pseudoobscura clade, except for the comparison between D. pseudoobscura and its close relative, Drosophila persimilis. An analysis of polymorphism data on a set of genes from D. pseudoobscura that evolve rapidly with respect to their protein sequences revealed no evidence for a faster-X effect with respect to adaptive protein sequence evolution; their rapid evolution is instead largely attributable to lower selective constraints. Faster-X evolution in the melanogaster clade was not related to male-biased gene expression; surprisingly, however, female-biased genes showed evidence for faster-X effects, perhaps due to their sexually antagonistic effects in males.

Item Type: Article
Uncontrolled Keywords: Chromosomes, Animals, Drosophila, Drosophila melanogaster, Selection, Genetic
Depositing User: Symplectic Admin
Date Deposited: 31 Oct 2016 09:44
Last Modified: 07 Feb 2024 11:44
DOI: 10.1093/gbe/evu229
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