| Autor: |
Orteu, Anna, McCarthy, Shane A, Hornett, Emily A, Gemmell, Matthew R, Reynolds, Louise A, Warren, Ian A, Gordon, Ian J, Hurst, Gregory D D, Durbin, Richard, Martin, Simon H, Jiggins, Chris D |
| Předmět: |
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| Zdroj: |
Genome Biology & Evolution; Oct2024, Vol. 16 Issue 10, p1-17, 17p |
| Abstrakt: |
Moths and butterflies (Lepidoptera) have a heterogametic sex chromosome system with females carrying ZW chromosomes and males ZZ. The lack of W chromosomes in early-diverging lepidopteran lineages has led to the suggestion of an ancestral Z0 system in this clade and a B chromosome origin of the W. This contrasts with the canonical model of W chromosome evolution in which the W would have originated from the same homologous autosomal pair as the Z chromosome. Despite the distinct models proposed, the rapid evolution of the W chromosome has hindered the elucidation of its origin. Here, we present high-quality, chromosome-level genome assemblies of 2 Hypolimnas species (Hypolimnas misippus and Hypolimnas bolina) and use the H. misippus assembly to explore the evolution of W chromosomes in butterflies and moths. We show that in H. misippus , the W chromosome has higher similarity to the Z chromosome than any other chromosome, which could suggest a possible origin from the same homologous autosome pair as the Z chromosome. However, using genome assemblies of closely related species (ditrysian lineages) containing assembled W chromosomes, we present contrasting evidence suggesting that the W chromosome might have evolved from a B chromosome instead. Crucially, by using a synteny analysis to infer homology, we show that W chromosomes are likely to share a common evolutionary origin in Lepidoptera. This study highlights the difficulty of studying the evolution of W chromosomes and contributes to better understanding its evolutionary origins. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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