家蚕
染色体
生物
基因组
昆虫
生殖器鳞翅目
遗传学
进化生物学
基因
植物
作者
Minjin Han,Chaorui Luo,Hai Hu,M. Lin,Kunpeng Lu,Jianghong Shen,Jianyu Ren,Y Ye,Éric Westhof,Xiaoling Tong,Fangyin Dai
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2024-06-19
卷期号:10 (25)
标识
DOI:10.1126/sciadv.adm9851
摘要
Lepidoptera, the most diverse group of insects, exhibit female heterogamy (Z0 or ZW), which is different from most other insects (male heterogamy, XY). Previous studies suggest a single origin of the Z chromosome. However, the origin of the lepidopteran W chromosome remains poorly understood. Here, we assemble the genome from females down to the chromosome level of a model insect ( Bombyx mori ) and identify a W chromosome of approximately 10.1 megabase using a newly developed tool. In addition, we identify 3593 genes that were not previously annotated in the genomes of B. mori . Comparisons of 21 lepidopteran species (including 17 ZW and four Z0 systems) and three trichopteran species (Z0 system) reveal that the formation of Ditrysia W involves multiple mechanisms, including previously proposed canonical and noncanonical models, as well as a newly proposed mechanism called single-Z turnover. We conclude that there are multiple independent origins of the W chromosome in the Ditrysia (most moths and all butterflies) of Lepidoptera.
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