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Sex-biased gene content is associated with sex chromosome turnover in Danaini butterflies.
- Source :
-
Molecular ecology [Mol Ecol] 2024 Jan 05, pp. e17256. Date of Electronic Publication: 2024 Jan 05. - Publication Year :
- 2024
- Publisher :
- Ahead of Print
-
Abstract
- Sex chromosomes play an outsized role in adaptation and speciation, and thus deserve particular attention in evolutionary genomics. In particular, fusions between sex chromosomes and autosomes can produce neo-sex chromosomes, which offer important insights into the evolutionary dynamics of sex chromosomes. Here, we investigate the evolutionary origin of the previously reported Danaus neo-sex chromosome within the tribe Danaini. We assembled and annotated genomes of Tirumala septentrionis (subtribe Danaina), Ideopsis similis (Amaurina), Idea leuconoe (Euploeina) and Lycorea halia (Itunina) and identified their Z-linked scaffolds. We found that the Danaus neo-sex chromosome resulting from the fusion between a Z chromosome and an autosome corresponding to the Melitaea cinxia chromosome (McChr) 21 arose in a common ancestor of Danaina, Amaurina and Euploina. We also identified two additional fusions as the W chromosome further fused with the synteny block McChr31 in I. similis and independent fusion occurred between ancestral Z chromosome and McChr12 in L. halia. We further tested a possible role of sexually antagonistic selection in sex chromosome turnover by analysing the genomic distribution of sex-biased genes in I. leuconoe and L. halia. The autosomes corresponding to McChr21 and McChr31 involved in the fusions are significantly enriched in female- and male-biased genes, respectively, which could have hypothetically facilitated fixation of the neo-sex chromosomes. This suggests a role of sexual antagonism in sex chromosome turnover in Lepidoptera. The neo-Z chromosomes of both I. leuconoe and L. halia appear fully compensated in somatic tissues, but the extent of dosage compensation for the ancestral Z varies across tissues and species.<br /> (© 2024 The Authors. Molecular Ecology published by John Wiley & Sons Ltd.)
Details
- Language :
- English
- ISSN :
- 1365-294X
- Database :
- MEDLINE
- Journal :
- Molecular ecology
- Publication Type :
- Academic Journal
- Accession number :
- 38180347
- Full Text :
- https://doi.org/10.1111/mec.17256