A new plant sex-linked gene with high sequence diversity and possible introgression of the X copy

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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. Heredity (2011) 106, 339-347; doi:10.1038/hdy.2010.76; published online 16 June 2010

Original languageEnglish
Pages (from-to)339-347
Number of pages9
JournalHeredity
Volume106
Issue number2
DOIs
Publication statusPublished - Feb 2011

Keywords

  • Chromosome Mapping
  • Chromosomes, Plant
  • Evolution, Molecular
  • Genetic Variation
  • Haplotypes
  • Inbreeding
  • Linkage Disequilibrium
  • Sex Chromosomes
  • Silene

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