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Updated: Sep 19, 2025

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使用转录组多样性来评估miRNA介导的转基因大米的非目标效应
Geng Chen1, Junjie Chen1, Ning Wen1
1State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China.
Journal of agricultural and food chemistry
|June 17, 2025
概括
米中的RNA干扰 (RNAi) 害虫控制显示出有希望的结果,但需要进行风险评估. 这项研究发现RNAi可以改变目标害虫的基因表达,而不会影响整体的转录组复杂性,提供新的安全评估方法.
科学领域:
- 农业科学 农业科学
- 分子生物学分子生物学
- 环境科学 环境科学
背景情况:
- RNA干扰 (RNAi) 技术为农业害虫控制提供了一种新的方法.
- 基于RNAi的米Csu260-16通过表达特定的miRNA来准干 (Chilo suppressalis),但潜在的目标外影响需要对环境风险进行评估.
- 开发强大的方法来评估RNAi作物的环境安全对于可持续农业至关重要.
研究的目的:
- 为了研究RNAi大米Csu260-16在转录组水平上对目标 (Chilo suppressalis) 和非目标 (Cnaphalocrocis medinalis) 昆虫的潜在跨物种非目标效应.
- 探索和分类来自RNAi暴露的意外差异表达基因 (DEGs).
- 建立转录组多样性指标,作为环境安全评估中量化RNAi风险的工具.
主要方法:
- 在食RNAi大米Csu260-16和非转基因对照 (ZH11) 后,对Chilo suppressalis和Cnaphalocrocis medinalis进行了比较转基因组分析.
- 进行了无意差异表达基因 (DEGs) 的识别和分类.
- 计算了转录组多样性指数,包括香农 (Hj) 和正常化的香农 (Hs),以及库尔巴克-莱布勒分歧 (Dj),并在治疗之间进行了比较.
主要成果:
- 在任何一种昆虫物种中,RNAi和对照治疗之间没有观察到总体转录组多样性 (香农) 的显著差异.
- 在21天的RNAi大米后,Culloback-Leibler分歧在Chilo suppressalis中增加,表明基因表达模式发生了变化.
- 根据它们与miRNA点的生物学关联,潜在的miRNA结合或意想不到的表达变化,确定和分类了无意中差异表达的基因.
结论:
- 通过RNAi介导的目标外效应可以在目标害虫的个体基因水平上发生,而不会影响整体的转录组复杂性.
- 转录组多样性指标,特别是库尔巴克-莱布勒分歧,是量化RNAi风险的新有效工具.
- 这项研究促进了基于RNAi的作物的环境安全评估,并支持开发环保的害虫控制策略.
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