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草业学报 ›› 2021, Vol. 30 ›› Issue (5): 121-133.DOI: 10.11686/cyxb2020219

• 研究论文 • 上一篇    下一篇

无芒隐子草全基因组水平全长LTR反转录转座子鉴定及其中断基因分析

王艺蒙(), 马甜甜, 欧阳子凤, 张吉宇()   

  1. 草地农业生态系统国家重点实验室,兰州大学草地农业科技学院,甘肃 兰州 730020
  • 收稿日期:2020-05-13 修回日期:2020-09-21 出版日期:2021-05-20 发布日期:2021-04-16
  • 通讯作者: 张吉宇
  • 作者简介:Corresponding author. E-mail: zhangjy@lzu.edu.cn
    王艺蒙(1997-),女,甘肃天水人,在读硕士。E-mail: wangym19@lzu.edu.cn
  • 基金资助:
    国家自然科学基金(31572453);甘肃省知识产权计划项目(19ZSCQ044)

Genome-wide identification of full-length long-terminal repeat retrotransposons and identification of interrupted genes in Cleistogenes songorica

Yi-meng WANG(), Tian-tian MA, Zi-feng OUYANG, Ji-yu ZHANG()   

  1. State Key Laboratory of Grassland Agro-ecosystems,College of Pastoral Agriculture Science and Technology,Lanzhou 730020,China
  • Received:2020-05-13 Revised:2020-09-21 Online:2021-05-20 Published:2021-04-16
  • Contact: Ji-yu ZHANG

摘要:

LTR反转录转座子是植物基因组内大量可移动的遗传因子,是基因组的重要成分之一。无芒隐子草基因组大小为543 M,全基因组中共鉴定出了299079个LTR反转录转座子,占全基因组的26.54%,但是缺少无芒隐子草全长LTR反转录转座子的研究。基于无芒隐子草全基因组序列,筛选出具有潜在活性的全长LTR反转录转座子845个,其中有410个属于Gypsy超家族,435个属于Copia超家族。对这些序列进行了系统进化树的构建和插入时间的分析,发现全长LTR反转录转座子的大量转座发生在4百万年内,插入时间较近,插入高峰期是1~1.5百万年间。筛选出被全长LTR反转录转座子中断的基因有183个,145个被中断的基因得到了GO功能注释,分析了被中断基因在不同干旱胁迫处理下的基因表达模式。对反转录转座子的鉴定有助于深入了解无芒隐子草的进化过程,为无芒隐子草全长LTR反转录转座子与中断基因的后续研究奠定基础。

关键词: 无芒隐子草, 全长LTR-RTs, 插入时间, 中断基因, 基因组

Abstract:

Long-terminal repeat retrotransposons (LTR-RTs) are mobile genetic factors that are an important component of, and are widely distributed across, the plant genome. The genome of Cleistogenes songorica is 543 M in size. In total, 299079 LTR-RTs have been identified in C. songoria, accounting for 26.54% of the total genome. The aim of this study was to identify full-length LTR-RTs in the C. songorica genome and determine when they arose and which genes they interrupt. Based on the whole genome sequence of C. songorica, 845 potential full-length LTR-RTs were identified, of which 410 belong to the Gypsy superfamily and 435 belong to the Copia superfamily. These sequences were subjected to phylogenetic and insertion time analyses. The results of those analyses indicated that many full-length LTR-RTs have been transposed within the last 4 million years. The range of insertion time was relatively short, and the peak period of LTR-RTs insertion was between 1 and 1.5 million years ago. We identified 183 genes that have been interrupted by full-length LTR-RTs in C. songorica, and 145 of them were annotated with Gene Ontology functions. We analyzed the transcript levels of the interrupted genes under different drought stress treatments. Identification of the dynamics of retrotransposons is helpful for understanding the complexities of C. songorica evolution, and lays the foundation for further research and analysis of full-length LTR-RTs in C. songorica.

Key words: Cleistogenes songorica, full length LTR retrotransposons, insertion time, interrupted genes, genome