Rapid degeneration of noncoding DNA regions surrounding SlAP3X/Y after recombination suppression in the dioecious plant Silene latifolia.

ABSTRACT: Silene latifolia is a dioecious plant with heteromorphic XY sex chromosomes. Previous studies of sex chromosome-linked genes have suggested a gradual divergence between the X-linked and the Y-linked genes in proportion to the distance from the pseudoautosomal region. However, such a comparison has yet to be made for the noncoding regions. To better characterize the nonrecombining region of the X and Y chromosomes, we sequenced bacterial artificial chromosome clones containing the sex chromosome-linked paralogs SlAP3X and SlAP3Y, including 115 kb and 73 kb of sequences, respectively, flanking these genes. The synonymous nucleotide divergence between SlAP3X and SlAP3Y indicated that recombination stopped approximately 3.4 million years ago. Sequence homology analysis revealed the presence of

SUBMITTER: Ishii K 

PROVIDER: S-EPMC3852375 | biostudies-literature | 2013 Dec

REPOSITORIES: biostudies-literature