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Global dosage compensation is ubiquitous in Lepidoptera, but counteracted by the masculinization of the Z chromosome [Molecular Biology & Evolution]

Keywords : sex chromosome evolution, sex-biased gene expression, faster-Z, tissue-specific expression, gonads, female-heterogamety

par Frédéric Magné - publié le

While chromosome-wide dosage compensation of the X chromosome has been found in many species, studies in ZW clades have indicated that compensation of the Z is more localized and/or incomplete. In the ZW Lepidoptera, some species show complete compensation of the Z chromosome, while others lack full equalization, but what drives these inconsistencies is unclear. Here, we compare patterns of male and female gene expression on the Z chromosome of two closely related butterfly species, Papilio xuthus and Papilio machaon, and in multiple tissues of two moths species, Plodia interpunctella and Bombyx mori, which were previously found to differ in the extent to which they equalize Z-linked gene expression between the sexes(...)

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