Heterochiasmy and Sex Chromosome Evolution in Silene.

ABSTRACT: The evolution of a non-recombining sex-specific region is a key step in sex chromosome evolution. Suppression of recombination between the (proto-) X- and Y-chromosomes in male meiosis creates a non-recombining Y-linked region (NRY), while the X-chromosome continues to recombine in females. Lack of recombination in the NRY defines its main properties-genetic degeneration and accumulation of repetitive DNA, making X and Y chromosomes very different from each other. How and why recombination suppression on sex chromosomes evolves remains controversial. A strong difference in recombination rates between the sexes (heterochiasmy) can facilitate or even cause recombination suppression. In the extreme case-complete lack of recombination in the heterogametic sex (achiasmy)-the entire sex-specific

SUBMITTER: Filatov DA 

PROVIDER: S-EPMC10048291 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature