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Heredity (Edinb). 2011 Feb;106(2):339-47. doi: 10.1038/hdy.2010.76. Epub 2010 Jun 16.

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

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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.

PMID:
20551975
PMCID:
PMC3044453
DOI:
10.1038/hdy.2010.76
[Indexed for MEDLINE]
Free PMC Article
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