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Nanopore Sequencing and De Novo Assembly of a Black-Shelled Pacific Oyster (Crassostrea gigas) Genome

文献类型： 外文期刊

作者： Wang, Xiaotong 1 ; Xu, Wenjie 2 ; Wei, Lei 1 ; Zhu, Chenglong 2 ; He, Cheng 1 ; Song, Hongce 1 ; Cai, Zhongqiang 3 ; Yu, 1 ;

作者机构： 1.Ludong Univ, Sch Agr, Yantai, Peoples R China

2.Northwestern Polytech Univ, Ctr Ecol & Environm Sci, Xian, Shaanxi, Peoples R China

3.Chinese Acad Fishery Sci, Changdao Enhancement & Expt Stn, Changdao, Peoples R China

关键词： Crassostrea gigas; black-shelled pacific oyster; evolution; genome assembly; nanopore sequencing

期刊名称：FRONTIERS IN GENETICS （ 影响因子：4.599； 五年影响因子：4.888 ）

ISSN：

年卷期： 2019 年 10 卷

页码：

收录情况： SCI

摘要： The Pacific oyster, Crassostrea gigas, belongs to one of the most species-rich phyla and provides important ecological and economical services. Here we present a genome assembly for a variety of this species, black-shelled Pacific oyster, using a combination of 61.8 Gb Nanopore long reads and 105.6 Gb raw BGI-seq short reads. The genome assembly comprised 3,676 contigs, with a total length of 587 Mb and a contig N50 of 581 kb. Annotation of the genome assembly identified 283 Mb (48.32%) of repetitive sequences and a total of 26,811 protein-coding genes. A long-term transposable element active, accompanied by recent expansion (1 million years ago), was detected in this genome. The divergence between black-shelled and the previous published Pacific oysters was estimated at about 2.2 million years ago, which implies that species C. gigas had great intraspecific genetic variations. Moreover, we identified 148/188 specifically expanded/contracted gene families in this genome. We believe this genome assembly will be a valuable resource for understanding the genetic breeding, conservation, and evolution of oysters and bivalves.

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