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黑龙江狗鱼(Esox reichertii)的染色体水平基因组组装与注释

Chromosome-level genome assembly and annotation of Amur Pike (Esox reichertii).

作者信息

Zhang Yuyong, Zhang Yongquan, Huo Tangbin, Qogt Gerel, Zhang Ping, Zhang Huiping, Jia Zhiying

机构信息

National and Local Joint Engineering Laboratory for Freshwater Fish Breeding, Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, 150070, China.

Administration Bureau of Hulun Lake National Nature Reserve in Inner Mongolia, Hulunbuir, 021000, China.

出版信息

Sci Data. 2025 Aug 20;12(1):1454. doi: 10.1038/s41597-025-05819-7.

Abstract

Amur pike (Esox reicherti) is endemic to the Heilongjiang River system in Northeast Asia. Serving as a top predator in its ecosystem, Amur pike carries substantial significance in ecological, economic, and cultural dimensions. Molecular studies have firmly established that Esociformes is the sister group of Salmoniformes. Notably, unlike Salmoniformes, Esociformes has not undergone genomic duplication. In this study, we reported a chromosome-level genome assembly of Amur pike, the size of which is 976.47 Mb with a contig N50 of 30.76 Mb. Using Hi-C interaction information, a total of 948.05 Mb (98.51%) of the assembled sequences was successfully anchored and ordered onto 25 pseudochromosomes, ranged from 22.85 Mb to 56.71 Mb. Further analysis identified 368.55 Mb of repetitive sequences and 25,824 protein-coding genes in the genome. Among them, 98.80% (25,515) of the genes were functionally annotated. This high-quality genome could be a valuable resource for future studies of Amur pike. Moreover, it lays a robust groundwork for comparative genomics involving pikes and salmonids.

摘要

黑龙江狗鱼(Esox reicherti)是东北亚黑龙江水系的特有物种。作为其生态系统中的顶级捕食者,黑龙江狗鱼在生态、经济和文化方面都具有重要意义。分子研究已确凿证实,狗鱼目是鲑形目的姐妹类群。值得注意的是,与鲑形目不同,狗鱼目尚未经历基因组复制。在本研究中,我们报道了黑龙江狗鱼的染色体水平基因组组装,其大小为976.47 Mb,重叠群N50为30.76 Mb。利用Hi-C相互作用信息,总共948.05 Mb(98.51%)的组装序列成功地被锚定并排列到25条假染色体上,长度从22.85 Mb到56.71 Mb不等。进一步分析确定基因组中有368.55 Mb的重复序列和25,824个蛋白质编码基因。其中,98.80%(25,515个)的基因得到了功能注释。这个高质量的基因组可能是未来黑龙江狗鱼研究的宝贵资源。此外,它为涉及狗鱼和鲑科鱼类的比较基因组学奠定了坚实的基础。

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