Multiple independent origins of the female W chromosome in moths and butterflies
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View abstract on PubMed
Summary
This summary is machine-generated.The W chromosome in Lepidoptera (moths and butterflies) has multiple independent origins. This study reveals new insights into the evolution of sex chromosomes in this diverse insect order.
Area Of Science
- Genomics
- Evolutionary Biology
- Entomology
Background
- Lepidoptera, a highly diverse insect order, exhibit female heterogamy (ZW/Z0 sex determination systems).
- The origin of the lepidopteran W chromosome is poorly understood, contrasting with the presumed single origin of the Z chromosome.
Purpose Of The Study
- To investigate the evolutionary origins of the W chromosome in Lepidoptera.
- To identify novel genes and characterize the W chromosome in the model insect *Bombyx mori*.
- To explore the mechanisms of W chromosome formation across different lepidopteran species.
Main Methods
- Chromosome-level genome assembly of the female *Bombyx mori*.
- Utilized a novel tool for W chromosome identification and characterization (approx. 10.1 Mb).
- Comparative genomic analysis of 21 lepidopteran species (17 ZW, 4 Z0) and 3 trichopteran species (Z0).
Main Results
- Identified 3593 previously unannotated genes in the *Bombyx mori* genome.
- Revealed multiple mechanisms for W chromosome formation in Ditrysia, including canonical, noncanonical, and a novel 'single-Z turnover' model.
- Genomic comparisons support independent W chromosome origins across Lepidoptera.
Conclusions
- The W chromosome in Ditrysia (moths and butterflies) has originated multiple times independently.
- The evolution of sex determination systems in Lepidoptera is characterized by diverse mechanisms.
- This study provides a comprehensive understanding of W chromosome evolution in Lepidoptera.
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