Does local adaptation cause high population differentiation of Silene Latifolia Y chromosomes?
Natural selection can reduce the effective population size of the nonrecombining Y chromosome, whereas local adaptation of Y-linked genes can increase the population divergence and overall intra-species polymorphism of Y-linked sequences. The plant Silene latifolia evolved a Y chromosome relatively...
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
18 August 2011
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| In: |
Evolution
Year: 2011, Volume: 65, Issue: 12, Pages: 3368-3380 |
| ISSN: | 1558-5646 |
| DOI: | 10.1111/j.1558-5646.2011.01410.x |
| Online Access: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1111/j.1558-5646.2011.01410.x Verlag, kostenfrei, Volltext: http://onlinelibrary.wiley.com/doi/10.1111/j.1558-5646.2011.01410.x/abstract 
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| Author Notes: | Graham Muir, Roberta Bergero, Deborah Charlesworth, and Dmitry A. Filatov |
| Summary: | Natural selection can reduce the effective population size of the nonrecombining Y chromosome, whereas local adaptation of Y-linked genes can increase the population divergence and overall intra-species polymorphism of Y-linked sequences. The plant Silene latifolia evolved a Y chromosome relatively recently, and most known X-linked genes have functional Y homologues, making the species interesting for comparisons of X- and Y-linked diversity and subdivision. Y-linked genes show higher population differentiation, compared to X-linked genes, and this might be maintained by local adaptation in Y-linked genes (or low sequence diversity). Here we attempt to test between these causes by investigating DNA polymorphism and population differentiation using a larger set of Y-linked and X-linked S. latifolia genes (than used previously), and show that net sequence divergence for Y-linked sequences (measured by Da, also known as δ) is low, and not consistently higher than X-linked genes. This does not support local adaptation, instead, the higher values of differentiation measures for the Y-linked genes probably result largely from reduced total variation on the Y chromosome, which in turn reflect deterministic processes lowering effective population sizes of evolving Y-chromosomes. |
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| Item Description: | Gesehen am 15.05.2017 |
| Physical Description: | Online Resource |
| ISSN: | 1558-5646 |
| DOI: | 10.1111/j.1558-5646.2011.01410.x |