A new plant sex-linked gene with high sequence diversity and possible introgression of the X copy |
| |
Authors: | V B Kaiser R Bergero D Charlesworth |
| |
Affiliation: | 1.Institute of Evolutionary Biology, School of Biological Sciences, The University of Edinburgh, Edinburgh, UK |
| |
Abstract: | We describe patterns of DNA sequence diversity in a newly identified sex-linked gene, SlX9/SlY9, in Silene latifolia (Caryophyllaceae). The copies on both sex chromosomes seem to be functional, and each maps close to the respective X- and Y-linked copy of another sex-linked gene pair, SlCypX/SlCypY. The Y-linked copy has low diversity, similar to what has been found for several other Y-linked genes in S. latifolia, and consistent with the theoretical expectations of hitch-hiking processes occurring on a non-recombining chromosome. However, SlX9 has higher diversity than other genes on the S. latifolia X chromosome. We evaluate the hypothesis of introgression from the closely related species S. dioica as an explanation for the high sequence diversity observed. |
| |
Keywords: | Silene latifolia sex chromosomes introgression SlX9 |
|
|