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Article Dans Une Revue Nature Communications Année : 2017

The deep conservation of the Lepidoptera Z chromosome suggests a non-canonical origin of the W

Résumé

Moths and butterflies (Lepidoptera) usually have a pair of differentiated WZ sex chromosomes. However, in most lineages outside of the division Ditrysia, as well as in the sister order Trichoptera, females lack a W chromosome. The W is therefore thought to have been acquired secondarily. Here we compare the genomes of three Lepidoptera species (one Dytrisia and two non-Dytrisia) to test three models accounting for the origin of the W: (1) a Z-autosome fusion; (2) a sex chromosome turnover; and (3) a non-canonical mechanism (e.g., through the recruitment of a B chromosome). We show that the gene content of the Z is highly conserved across Lepidoptera (rejecting a sex chromosome turnover) and that very few genes moved onto the Z in the common ancestor of the Ditrysia (arguing against a Zautosome fusion). Our comparative genomics analysis therefore supports the secondary acquisition of the Lepidoptera W by a non-canonical mechanism, and it confirms the extreme stability of well-differentiated sex chromosomes.
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Dates et versions

hal-03821394 , version 1 (23-11-2022)

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Christelle Fraïsse, Marion a L Picard, Beatriz Vicoso. The deep conservation of the Lepidoptera Z chromosome suggests a non-canonical origin of the W. Nature Communications, 2017, 8 (1), pp.1486. ⟨10.1038/s41467-017-01663-5⟩. ⟨hal-03821394⟩
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