虾肝肠胞虫全基因组SSR位点分布及比较分析
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全德润(1999-),男,硕士研究生,研究方向为水产养殖.E-mail:852250713@qq.com

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S941

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江苏现代农业(特色水产)产业技术体系创新中心项目(JATS[2022]419, JATS[2023]380); 江苏省六大人才高峰项目(2019-NY- 106); 江苏省农业科技自主创新资金项目(CX(21)3160)


Distribution and comparative analysis of SSR sites in the whole genome of Enterocytozoon hepatopenaei (EHP)
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    摘要:

    为开发虾肝肠胞虫(Enterocytozoon hepatopenaei, EHP)及其近缘种的分子标记, 本研究采用生物信息学方法, 对虾肝肠胞虫全基因组中 SSR (simple sequence repeat, 简单重复序列)位点的数量、分布及频率等信息进行统计分析, 并与其他 5 种微孢子虫真菌物种基因组进行了比较。在虾肝肠胞虫基因组中共搜索到 794 个 SSR, 总长度为 21773 bp, 占基因组的 0.72%, SSR 的平均长度为 27.43 bp, 相对丰度为 262 loci/Mb, 相对密度为 7184.43 bp/Mb。6 种SSR类型中, 四核苷酸SSR数量最多, 有570个, 总长度为12152 bp, 占SSR总数的71.79%, 平均长度为21.32 bp, 相对丰度为 188.08 loci/Mb, 相对密度为 4009.79 bp/Mb; 二核苷酸 SSR 数量最少, 仅有 20 个, 总长度为 280 bp, 占 SSR 总数的 2.52%, 平均长度为 14 bp, 相对丰度为 6.6 loci/Mb, 相对密度为 92.39 bp/Mb。基因组高频率(≥10)出现的 SSR 重复类型为: AACT, TTAG, TAGT, ACTA, AGTT, CTAA, AACTA, GTTA, TTAGT, TAAC, AT。选择序列长度不小于 20 bp 的多核苷酸 SSR 共计 30 个, 进行引物设计用于物种鉴定。利用 GO 数据库对含 SSR 基因进行功能注释, 共有 28 个基因(3.53%)注释到分子功能、生物进程及细胞组分 3 类中。将虾肝肠胞虫与其他微孢子虫真菌相比, 虾肝肠胞虫中 SSR 的数量及相对丰度适中, 由此可知基因组大小与 SSR 数量无关。本研究为虾肝肠胞虫的种群遗传及进化相关研究奠定了基础。

    Abstract:

    Enterocytozoon hepatopenaei (EHP) is a microsporidian parasite that infects shrimp. Although EHP infection does not cause widespread mortality in shrimp, it significantly slows down their growth and makes them more susceptible to other pathogens, resulting in significant economic losses. Thus, it has emerged as a major threat to the shrimp farming industry. The successful decoding of its genome sequence and genetic code has provided a robust foundation for various fundamental research endeavors. These endeavors provide valuable data essential for the identification and exploration of important functional genes in EHP. Here, we aimed to study the basic information regarding microsatellites in the EHP genome and provide theoretical support for molecular marker development, population evolution, and genetic diversity studies of EHP and its related species. We used bioinformatics to analyze the quantity, distribution, and frequency of SSR (simple sequence repeat) sites in the whole EHP genome and compared them with the corresponding properties of five other microsporidian fungal species. A total of 794 SSRs were identified in the EHP genome, with a total length of 21773 bp, accounting for 0.72% of the genome. The average length of SSRs was 27.43 bp, with a relative abundance of 262 loci/Mb and a relative density of 7184.43 bp/Mb. Of the six identified types of SSRs, tetranucleotide SSRs were the most prevalent, with 570 SSRs and a total length of 12152 bp; they accounted for 71.79% of the total SSRs, the average length of SSRs was 21.32 bp, with a relative abundance of 188.08 loci/Mb and a relative density of 4009.79 bp/Mb. Dinucleotide SSRs were the least prevalent, with only 20 SSRs and a total length of 280 bp; they accounted for 2.52% of the total SSRs, the average length of SSRs was 14 bp, with a relative abundance of 6.6 loci/Mb and a relative density of 92.39 bp/Mb. The most frequently occurring SSR in the genome (≥10) included AACT, TTAG, TAGT, ACTA, AGTT, CTAA, AACTA, GTTA, TTAGT, TAAC, and AT. Thirty multi-nucleotide SSRs with sequence lengths≥20 bp were selected for primer design for species identification. The genes containing SSRs were functionally annotated using the Gene Ontology database, and a total of 28 genes (3.53%) were annotated into three categories: molecular function, biological process, and cellular component. Compared to other microsporidian fungi, EHP has a moderate abundance of SSRs, and the quantity of SSRs is independent of genome size. This study provides a theoretical foundation for population genetics and evolutionary research of EHP.

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全德润,王李宝,黎慧,史文军,朱健强,顾舒文,顾晨,任乾,万夕和.虾肝肠胞虫全基因组SSR位点分布及比较分析[J].中国水产科学,2023,30(11):1398-1408
QUAN Derun, WANG Libao, LI Hui, SHI Wenjun, ZHU Jianqiang, GU Shuwen, GU Chen, REN Qian, WAN Xihe. Distribution and comparative analysis of SSR sites in the whole genome of Enterocytozoon hepatopenaei (EHP)[J]. Journal of Fishery Sciences of China,2023,30(11):1398-1408

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  • 收稿日期:2023-10-07
  • 最后修改日期:2023-11-17
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  • 在线发布日期: 2024-03-14
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