Mining of InDel marker and association analysis of hypoxia tolerance traits in Trachinotus ovatus based on resequencing
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摘要: 卵形鲳鲹 (Trachinotus ovatus) 是高耗氧率的鱼类,低氧极易导致其死亡。筛选其耐低氧性状InDel分子标记并挖掘影响耐低氧性状的功能基因,可为选育具有较强耐低氧能力的卵形鲳鲹提供有益指导。利用全基因组重测序技术分析了卵形鲳鲹基因InDel差异,挖掘卵形鲳鲹与耐低氧性状显著关联的InDel位点,并探讨了与耐低氧性状相关的候选基因。结果表明,测序共获得693.48 Gb数据,其中Q30的平均值为90.8%,注释分析发现了共2 574 178个InDel位点。敏感组50尾卵形鲳鲹所特有的InDel共249 395个,其中2 209个位于外显子上,在核苷酸切除修复信号通路和细胞黏着分子中存在变异基因。将InDel位点与耐低氧性状关联分析发现,3个InDel位点 (InDel 22883061、InDel 24919481和InDel 14451779) 接近显著性阈值,注释分析获得了9个候选基因。筛选到的InDel位点对后期分子标记选择育种的选择和鉴定有重要价值,注释到的候选基因为卵形鲳鲹耐低氧的机理研究提供了基础和依据。Abstract: Trachinotus ovatus is a fish with high oxygen consumption rate, and hypoxia can easily lead to its death. Screening for InDel molecular markers for hypoxia tolerance traits in T. ovatus and discovering functional genes affecting hypoxia tolerance traits can provide guidances for selecting and breeding T. ovatus with strong hypoxia tolerance. In this study, we applied the whole genome resequencing technology to analyze the InDel differences of T. ovatus gene, excavated the InDel sites that were significantly associated with hypoxia tolerance traits in T. ovatus, and explored the candidate genes related to hypoxia tolerance traits. Altogether 693.48 Gb was obtained by sequencing, and the average value of Q30 was 90.8%. A total of 2 574 178 InDel markers were found by annotation analysis. A total of 249 395 InDel markers were found in the 50 individuals in the tolerance group, of which 2 209 were located in exons. It is found that there were mutated genes in the nucleotide excise repair signaling pathway and cell adhesion molecules. Three InDel markers (InDel 22883061, InDel 24919481 and InDel 14451779) were found to be close to the significance threshold by association analysis between InDel markers and hypoxia tolerance trait. Nine candidate genes were obtained by annotation analysis. The selected InDel markers were of great value for selecting and identifying molecular marker selection breeding. The annotated candidate genes provide a basis and references for the study of the hypoxia tolerance mechanism of T. ovatus.
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Key words:
- Trachinotus ovatus /
- InDel /
- Resequencing /
- Hypoxia tolerance trait
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表 1 鉴定到的不同长度InDel的数量
Table 1. Number of InDels of different sizes identified
InDel类型
InDel TypeInDel大小
InDel Size/bp数量
Number百分比
Percentage/%InDel类型
InDel TypeInDel大小
InDel Size/bp数量
Number百分比
Percentage/%插入 Insertion 1 496002 44.94 缺失 Deletion 1 532256 37.7 2 189179 17.14 2 292212 20.7 3 58625 5.31 3 107471 7.6 4 69620 6.31 4 106766 7.6 5 23055 2.09 5 43919 3.1 6 43192 3.91 6 62130 4.4 7 13832 1.25 7 27167 1.9 8 28729 2.60 8 39844 2.8 9 11719 1.06 9 20564 1.5 10 20236 1.83 10 27837 2.0 ≥11 149421 13.54 ≥11 152545 10.8 总计 Total 1103610 总计 Total 1412711 表 2 变异基因GO功能分类注释
Table 2. GO classification of mutated genes
类别
Classification条目
Term变异基因数量
Number of
variant genes细胞组分
Cellular component染色体 7 顶体泡 6 线粒体外膜 4 电压门控钾离子通道复合物 3 肌间盘 3 分子功能
Molecular function核酸结合 11 GTP结合 8 电压门控离子通道活性 5 镁离子结合 5 转录辅抑制活性 5 生物过程
Biological process细胞对DNA损伤刺激的反应 7 Wnt信号通路 6 细胞器组织 6 骨骼肌组织发育 5 DNA整合 5 -
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