title: A new plant sex-linked gene with high sequence diversity and possible introgression of the X copy.
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.
authors.affiliation: Institute of Evolutionary Biology, School of Biological Sciences, The University of Edinburgh, Edinburgh, UK.
authors.forename: V B
authors.initials: VB
authors.lastname: Kaiser
authors.forename: R
authors.initials: R
authors.lastname: Bergero
authors.forename: D
authors.initials: D
authors.lastname: Charlesworth
mesh_terms: 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*