Journal of Integrative Agriculture ›› 2022, Vol. 21 ›› Issue (6): 1620-1632.DOI: 10.1016/S2095-3119(21)63827-3

所属专题: 园艺-分子生物合辑Horticulture — Genetics · Breeding

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JIA-2021-0472 白菜与甘蓝中DNA甲基化相关基因的系统鉴定、进化选择和遗传变异研究

  

  • 收稿日期:2021-03-15 接受日期:2021-09-02 出版日期:2022-06-01 发布日期:2021-09-02

Genome-wide identification, evolutionary selection, and genetic variation of DNA methylation-related genes in Brassica rapa and Brassica oleracea

AN Feng1, 2*, ZHANG Kang2*, ZHANG Ling-kui2, LI Xing2, CHEN Shu-min2, WANG Hua-sen1, CHENG Feng2   

  1. 1 Collaborative Innovation Center for Efficient and Green Production of Agriculture in Zhejiang Mountainous Areas, College of Horticulture Science, Zhejiang A&F University, Hangzhou 311300, P.R.China

    2 Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China

  • Received:2021-03-15 Accepted:2021-09-02 Online:2022-06-01 Published:2021-09-02
  • About author:AN Feng, E-mail: xiaodai_an@163.com; ZHANG Kang, E-mail: zhangkang01@caas.cn; Correspondence CHENG Feng, E-mail: chengfeng@caas.cn; WANG Hua-sen, E-mail: whsych66@163.com * These authors contributed equally to this study.
  • Supported by:

    The work was supported by the National Natural Science Foundation of China (NSFC; 31872105 and 31801862), the Science and Technology Innovation Program of the Chinese Academy of Agricultural Sciences, and the Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture and Rural Affairs, China.

摘要:

本研究在白菜和甘蓝中分别鉴定了78和77个DNA甲基化相关基因。分析发现,在白菜和甘蓝中不同DNA甲基化相关通路基因的数目存在差异。通过比较DNA甲基化相关基因的进化选择压力发现,它们在白菜与甘蓝中表现出不同的进化特征。基于核苷酸多样性和选择消除分析还发现了白菜和甘蓝群体中DNA甲基化相关基因的选择印记。通过转录组分析发现,绝大部分的DNA甲基化相关基因在白菜和甘蓝中具有相似的表达特征。本研究解析了白菜和甘蓝中DNA甲基化相关基因的进化及遗传变异,为研究白菜与甘蓝中DNA甲基化模式的趋异进化提供了重要的数据支撑


Abstract: DNA methylation plays an important role in plant growth and development, and in regulating the activity of transposable elements (TEs).  Research on DNA methylation-related (DMR) genes has been reported in Arabidopsis, but little research on DMR genes has been reported in Brassica rapa and Brassica oleracea, the genomes of which exhibit significant differences in TE content.  In this study, we identified 78 and 77 DMR genes in Brassica rapa and Brassica oleracea, respectively.  Detailed analysis revealed that the numbers of DMR genes in different DMR pathways varied in B. rapa and B. oleracea.  The evolutionary selection pressure of DMR genes in B. rapa and B. oleracea was compared, and the DMR genes showed differential evolution between these two species.  The nucleotide diversity (π) and selective sweep (Tajima’s D) revealed footprints of selection in the B. rapa and B. oleracea populations.  Transcriptome analysis showed that most DMR genes exhibited similar expression characteristics in B. rapa and B. oleracea.  This study dissects the evolutionary differences and genetic variations of the DMR genes in B. rapa and B. oleracea, and will provide valuable resources for future research on the divergent evolution of DNA methylation between B. rapa and B. oleracea.

Key words: DNA methylation , Brassica rapa , Brassica oleracea , evolutionary selection , genetic variation , gene expression