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Originally published as Genetics Published Articles Ahead of Print on April 16, 2005.
Genetics, Vol. 170, 975-979, June 2005, Copyright © 2005
doi:10.1534/genetics.104.037069
Evolutionary History of Silene latifolia Sex Chromosomes Revealed by Genetic Mapping of Four Genes
Dmitry A. Filatov1
School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
1 Author e-mail: d.filatov{at}bham.ac.uk
The sex chromosomes of dioecious white campion, Silene latifolia (Caryophyllaceae), are of relatively recent origin (10–20 million years), providing a unique opportunity to trace the origin and evolution of sex chromosomes in this genus by comparing closely related Silene species with and without sex chromosomes. Here I demonstrate that four genes that are X-linked in S. latifolia are also linked in nondioecious S. vulgaris, which is consistent with OHNO's (1967) hypothesis that sex chromosomes evolve from a single pair of autosomes. I also report a genetic map for four S. latifolia X-linked genes, SlX1, DD44X, SlX4, and a new X-linked gene SlssX, which encodes spermidine synthase. The order of the genes on the S. latifolia X chromosome and divergence between the homologous X- and Y-linked copies of these genes supports the "evolutionary strata" model, with at least three consecutive expansions of the nonrecombining region on the Y chromosome (NRY) in this plant species.
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