Assembly of the poorly differentiated Verasper variegatus W chromosome by different sequencing technologies
文献类型： 外文期刊
作者： Xu, Xi-wen 1 ; Sun, Pengchuan 3 ; Gao, Chengbin 1 ; Zheng, Weiwei 1 ; Chen, Songlin 1 ;
作者机构： 1.Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, State Key Lab Mariculture Biobreeding & Sustainabl, Qingdao 266071, Peoples R China
2.Laoshan Lab, Lab Marine Fisheries Sci & Food Prod Proc, Qingdao 266237, Peoples R China
3.Sichuan Univ, Coll Life Sci, Key Lab Bioresources & Ecoenvironm, Chengdu 610065, Peoples R China
4.Sichuan Univ, Coll Life Sci, Sichuan Zoige Alpine Wetland Ecosyst Natl Observat, Chengdu 610065, Peoples R China
期刊名称：SCIENTIFIC DATA （ 影响因子：9.8； 五年影响因子：10.8 ）
ISSN：
年卷期： 2023 年 10 卷 1 期
页码：
收录情况： SCI
摘要： The assembly of W and Y chromosomes poses significant challenges in vertebrate genome sequencing and assembly. Here, we successfully assembled the W chromosome of Verasper variegatus with a length of 20.48 Mb by combining population and PacBio HiFi sequencing data. It was identified as a young sex chromosome and showed signs of expansion in repetitive sequences. The major component of the expansion was Ty3/Gypsy. The ancestral Osteichthyes karyotype consists of 24 protochromosomes. The sex chromosomes in four Pleuronectiformes species derived from a pair of homologous protochromosomes resulting from a whole-genome duplication event in teleost fish, yet with different sex-determination systems. V. variegatus and Cynoglossus semilaevis adhere to the ZZ/ZW system, while Hippoglossus stenolepis and H. hippoglossus follow the XX/XY system. Interestingly, V. variegatus and H. hippoglossus derived from one protochromosome, while C. semilaevis and H. stenolepis derived from another protochromosome. Our study provides valuable insights into the evolution of sex chromosomes in flatfish and sheds light on the important role of whole-genome duplication in shaping the evolution of sex chromosomes.
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