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Evolutionary analysis of the female-specific avian W chromosome

AutorSmeds, Linnéa; Warmuth, Vera; Bolivar, Paulina; Uebbing, Severin; Burri, Reto; Suh, Alexander; Nater, Alexander; Burês, S.; Garamszegi, László Z. ; Hogner, Silje; Moreno Klemming, Juan ; Qvarnström, Anna; Ruzic, Milan; Saether, Stein-Are; Saether, Glenn-Peter; Török, János; Ellegren, Hans
Fecha de publicación2015
EditorNature Publishing Group
CitaciónNature Communications, 6: 7330 (2015)
ResumenThe typically repetitive nature of the sex-limited chromosome means that it is often excluded from or poorly covered in genome assemblies, hindering studies of evolutionary and population genomic processes in non-recombining chromosomes. Here, we present a draft assembly of the non-recombining region of the collared flycatcher W chromosome, containing 46 genes without evidence of female-specific functional differentiation. Survival of genes during Wchromosome degeneration has been highly non-random and expression data suggest that this can be attributed to selection for maintaining gene dose and ancestral expression levels of essential genes. Re-sequencing of large population samples revealed dramatically reduced levels of within-species diversity and elevated rates of between-species differentiation (lineage sorting), consistent with low effective population size. Concordance between W chromosome and mitochondrial DNA phylogenetic trees demonstrates evolutionary stable matrilineal inheritance of this nuclear–cytonuclear pair of chromosomes. Our results show both commonalities and differences between W chromosome and Y chromosome evolution
Versión del editorhttp://dx.doi.org/10.1038/ncomms8330
URIhttp://hdl.handle.net/10261/117121
DOI10.1038/ncomms8330
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