| Autor: |
Yazdi HP; Department of Biology, Lund University, SE-223 62 Lund, Sweden., Silva WTAF; Centre for Environmental and Climate Research, Lund University, SE-223 62 Lund, Sweden., Suh A; School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich NR4 7TU, UK.; Department of Organismal Biology-Systematic Biology, Uppsala University, SE-752 36 Uppsala, Sweden. |
| Jazyk: |
angličtina |
| Zdroj: |
Genes [Genes (Basel)] 2020 Sep 30; Vol. 11 (10). Date of Electronic Publication: 2020 Sep 30. |
| DOI: |
10.3390/genes11101153 |
| Abstrakt: |
The hallmark of sex chromosome evolution is the progressive suppression of recombination which leads to subsequent degeneration of the non-recombining chromosome. In birds, species belonging to the two major clades, Palaeognathae (including tinamous and flightless ratites) and Neognathae (all remaining birds), show distinctive patterns of sex chromosome degeneration. Birds are female heterogametic, in which females have a Z and a W chromosome. In Neognathae, the highly-degenerated W chromosome seems to have followed the expected trajectory of sex chromosome evolution. In contrast, among Palaeognathae, sex chromosomes of ratite birds are largely recombining. The underlying reason for maintenance of recombination between sex chromosomes in ratites is not clear. Degeneration of the W chromosome might have halted or slowed down due to a multitude of reasons ranging from selective processes, such as a less pronounced effect of sexually antagonistic selection, to neutral processes, such as a slower rate of molecular evolution in ratites. The production of genome assemblies and gene expression data for species of Palaeognathae has made it possible, during recent years, to have a closer look at their sex chromosome evolution. Here, we critically evaluate the understanding of the maintenance of recombination in ratites in light of the current data. We conclude by highlighting certain aspects of sex chromosome evolution in ratites that require further research and can potentially increase power for the inference of the unique history of sex chromosome evolution in this lineage of birds. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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