Evolutionary strata on young mating-type chromosomes despite the lack of sexual antagonism.

ABSTRACT: Sex chromosomes can display successive steps of recombination suppression known as "evolutionary strata," which are thought to result from the successive linkage of sexually antagonistic genes to sex-determining genes. However, there is little evidence to support this explanation. Here we investigate whether evolutionary strata can evolve without sexual antagonism using fungi that display suppressed recombination extending beyond loci determining mating compatibility despite lack of male/female roles associated with their mating types. By comparing full-length chromosome assemblies from five anther-smut fungi with or without recombination suppression in their mating-type chromosomes, we inferred the ancestral gene order and derived chromosomal arrangements in this group. This approach shed

SUBMITTER: Branco S 

PROVIDER: S-EPMC5502610 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature