Genetic Diversity in the UV Sex Chromosomes of the Brown Alga Ectocarpus.

ABSTRACT: Three types of sex chromosome system exist in nature: diploid XY and ZW systems and haploid UV systems. For many years, research has focused exclusively on XY and ZW systems, leaving UV chromosomes and haploid sex determination largely neglected. Here, we perform a detailed analysis of DNA sequence neutral diversity levels across the U and V sex chromosomes of the model brown alga Ectocarpus using a large population dataset. We show that the U and V non-recombining regions of the sex chromosomes (SDR) exhibit about half as much neutral diversity as the autosomes. This difference is consistent with the reduced effective population size of these regions compared with the rest of the genome, suggesting that the influence of additional factors such as background selection or selective s

SUBMITTER: Avia K 

PROVIDER: S-EPMC6027523 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature