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<p>Graylings (<i>Thymallus</i>) represent one of the earliest diverged salmonid subfamilies and provide crucial insights into the evolutionary consequences of the salmonid-specific whole genome duplication event (Ss4R). Here, we present the first chromosome-level genome assembly of the Amur grayling (<i>Thymallus grubii</i>), an economically and ecologically important species endemic to East Asian freshwater systems. The final assembly spans 1,754.51 Mb with 46 pseudo-chromosomes, achieving a contig N50 of 3.03 Mb and anchoring 99.97% of sequences to chromosomes. The genome contains 31,867 protein-coding genes with 97.58% functionally annotated. Repetitive sequences comprise 52.64% of the genome, dominated by DNA transposons (22.06%). BUSCO analysis indicates 97.9% completeness for conserved Actinopterygii genes. This high-quality genome assembly provides an essential resource for salmonid comparative genomics, aquaculture breeding programs, and conservation genetics of this economically important species.</p>

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A high-quality chromosome-level genome assembly and annotation of the Amur grayling (Thymallus grubii)

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年12月18日

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  • Gaochao Wang,
  • Kai Ma,
  • Tianqing Huang,
  • Enhui Liu,
  • Wei Gu,
  • Peng Fan,
  • Kaibo Ge,
  • Yunchao Sun,
  • Datian Li,
  • Junwei Wang,
  • Xinyang Wang,
  • Gefeng Xu,
  • Yongquan Zhang

摘要

Graylings (Thymallus) represent one of the earliest diverged salmonid subfamilies and provide crucial insights into the evolutionary consequences of the salmonid-specific whole genome duplication event (Ss4R). Here, we present the first chromosome-level genome assembly of the Amur grayling (Thymallus grubii), an economically and ecologically important species endemic to East Asian freshwater systems. The final assembly spans 1,754.51 Mb with 46 pseudo-chromosomes, achieving a contig N50 of 3.03 Mb and anchoring 99.97% of sequences to chromosomes. The genome contains 31,867 protein-coding genes with 97.58% functionally annotated. Repetitive sequences comprise 52.64% of the genome, dominated by DNA transposons (22.06%). BUSCO analysis indicates 97.9% completeness for conserved Actinopterygii genes. This high-quality genome assembly provides an essential resource for salmonid comparative genomics, aquaculture breeding programs, and conservation genetics of this economically important species.