Multiple Origins of Sex Chromosomes in Nothobranchius Killifishes.

ABSTRACT: Sex chromosomes have evolved repeatedly across eukaryotes. The emergence of a sex-determining (SD) locus is expected to progressively restrict recombination, driving convergent molecular differentiation. However, evidence from taxa like teleost fishes, representing over half of vertebrate species with unmatched diversity in SD systems, challenges this model. Teleost sex chromosomes are often difficult to detect as they experience frequent turnovers, resetting the differentiation process. Nothobranchius killifishes, which include the XY system shared by N. furzeri and N. kadleci and X₁X₂Y systems in six other species, offer a valuable model to study sex chromosome turnovers. We characterised X₁X₂Y systems in five killifish species and found that s

SUBMITTER: Hospodarska M 

PROVIDER: S-EPMC12329641 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature