Following the Pathway of W Chromosome Differentiation in Triportheus (Teleostei: Characiformes).

ABSTRACT: In this work, we trace the dynamics of satellite DNAs (SatDNAs) accumulation and elimination along the pathway of W chromosome differentiation using the well-known Triportheus fish model. Triportheus stands out due to a conserved ZZ/ZW sex chromosome system present in all examined species. While the Z chromosome is conserved in all species, the W chromosome is invariably smaller and exhibits differences in size and morphology. The presumed ancestral W chromosome is comparable to that of T. auritus, and contains 19 different SatDNA families. Here, by examining five additional Triportheus species, we showed that the majority of these repetitive sequences were eliminated as speciation was taking place. The W chromosomes continued degeneration, while the Z chromosom

SUBMITTER: de Oliveira MPB 

PROVIDER: S-EPMC10452202 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature