A comprehensive analysis of the O-methyltransferase gene family in the chili pepper (Capsicum annuum) identifies COMT36 involved in capsaicinoids biosynthesis

文献类型： 外文期刊

第一作者： Li, Shanglin

作者： Li, Shanglin;Cai, Yutong;Yang, Ruyi;Chen, Guoju;Chen, Changming;Zhu, Zhangsheng;Ma, Hongmei;Liu, Yixuan;Zheng, Jie;Zhou, Xin;He, Jianwen;Wu, Di

作者机构：

关键词： Capsicum; O-methyltransferase; Gene family; Capsaicin

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.5； 五年影响因子：8.7 ）

ISSN： 0141-8130

年卷期： 2025 年 312 卷

页码：

收录情况： SCI

摘要： O-methyltransferases (OMTs) play vital roles in secondary metabolites methylation. While chili peppers (Capsicum annum) are rich in specialized metabolites, OMT functional characterization remains limited in this species. In this study, we identified 58 OMT genes through genome-wide analysis, revealing uneven chromosomal distribution with frequent tandem duplications contributing to gene family expansion. Phylogenetic and conserved motif analysis classified these OMTs into caffeoyl-CoA O-methyltransferases (CCoAOMT) and caffeic acid O-methyltransferases (COMT) subfamilies. Differential expression patterns across tissues and promoter cis-element variations suggested functional diversification. Notably, CaCOMT36 was demonstrated to participate in capsaicinoid biosynthesis. These findings provide valuable insights into the molecular characteristics and biological functions of the OMT gene family in chili pepper, particularly the potential mechanisms associated with O-methylation during capsaicinoid biosynthesis.

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