Evolutionary strata on the X chromosomes of the dioecious plant Silene latifolia: evidence from new sex-linked genes.

ABSTRACT: Despite its recent evolutionary origin, the sex chromosome system of the plant Silene latifolia shows signs of progressive suppression of recombination having created evolutionary strata of different X-Y divergence on sex chromosomes. However, even after 8 years of effort, this result is based on analyses of five sex-linked gene sequences, and the maximum divergence (and thus the age of this plant's sex chromosome system) has remained uncertain. More genes are therefore needed. Here, by segregation analysis of intron size variants (ISVS) and single nucleotide polymorphisms (SNPs), we identify three new Y-linked genes, one being duplicated on the Y chromosome, and test for evolutionary strata. All the new genes have homologs on the X and Y chromosomes. Synonymous divergence estimated betwee

SUBMITTER: Bergero R 

PROVIDER: S-EPMC1855140 | biostudies-literature | 2007 Apr

REPOSITORIES: biostudies-literature