A new plant sex-linked gene with high sequence diversity and possible introgression of the X copy.
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.
Kaiser
V B
VB
Institute of Evolutionary Biology, School of Biological Sciences, The University of Edinburgh, Edinburgh, UK.
Bergero
R
R
Charlesworth
D
D
D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D019143:Evolution, Molecular; D014644:Genetic Variation; D006239:Haplotypes; D007178:Inbreeding; D015810:Linkage Disequilibrium; D012730:Sex Chromosomes; D029751:Silene / Q000235:genetics*