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• W3026692784 abstract "Abstract The loss of recombination triggers divergence between the sex chromosomes and promotes degeneration of the sex-limited chromosome. Several livebearers within the genus Poecilia share a male-heterogametic sex chromosome system that is roughly 20 Myr old, with extreme variation in the degree of Y chromosome divergence. In Poecilia picta, the Y is highly degenerate and associated with complete X chromosome dosage compensation. In contrast, although recombination is restricted across almost the entire length of the sex chromosomes in Poecilia reticulata and Poecilia wingei, divergence between the X chromosome and the Y chromosome is very low. This clade therefore offers a unique opportunity to study the forces that accelerate or hinder sex chromosome divergence. We used RNA-seq data from multiple families of both P. reticulata and P. wingei, the species with low levels of sex chromosome divergence, to differentiate X and Y coding sequences based on sex-limited SNP inheritance. Phylogenetic tree analyses reveal that occasional recombination has persisted between the sex chromosomes for much of their length, as X- and Y-linked sequences cluster by species instead of by gametolog. This incomplete recombination suppression maintains the extensive homomorphy observed in these systems. In addition, we see differences between the previously identified strata in the phylogenetic clustering of X–Y orthologs, with those that cluster by chromosome located in the older stratum, the region previously associated with the sex-determining locus. However, recombination arrest appears to have expanded throughout the sex chromosomes more gradually instead of through a stepwise process associated with inversions." @default.
• W3026692784 created "2020-05-29" @default.
• W3026692784 creator A5017609173 @default.
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• W3026692784 date "2020-05-19" @default.
• W3026692784 modified "2023-10-11" @default.
• W3026692784 title "Guppy Y Chromosome Integrity Maintained by Incomplete Recombination Suppression" @default.
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• W3026692784 doi "https://doi.org/10.1093/gbe/evaa099" @default.
• W3026692784 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7337182" @default.
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• W3026692784 hasPublicationYear "2020" @default.
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