在OsPT1的5' UTR中插入一个转子子重新编程其表达模式,并促进在米粒中的积累
Shasha Peng1, Dan Wang2, Jinling Liu2
1State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China; Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Utilization and College of Agronomy, Hunan Agricultural University, Changsha, Hunan 410128, China.
Plant communications
|October 17, 2025
概括
科学家们发现了一种新的 (Cd) 在大米中的积累机制. 在由OsbHLH35调节的OsPT1基因中插入一个转子子,增加了Cd的吸收,为更健康的水作物提供了目标.
科学领域:
- 农业科学 农业科学
- 遗传学 遗传学 是一个
- 环境科学 环境科学
背景情况:
- 在米粒中积累的 (Cd) 对人类健康构成重大风险.
- 驱动大米中Cd积累的精确机制尚未完全理解.
研究的目的:
- 为了确定与大米中谷物Cd含量相关的遗传位置.
- 阐明由OsPT1基因介导的Cd积累的分子机制.
- 探索基因编辑的潜力,以减少米粒中的Cd含量.
主要方法:
- 全基因组关联分析 (GWAS) 用于识别与谷物Cd含量相关的位点.
- 对载体基因OsPT1及其调节元件的分析,包括转子体插入 (H-MITE).
- 转录因子OsbHLH35.35的识别和表征
- 在CRISPR-Cas9基因编辑中,针对OsPT1和OsbHLH35.35.
主要成果:
- 确定了29个与谷物Cd含量相关的位点 (LAGCCs),其中LAGCC4具有高度意义.
- 发现H-MITE插入OsPT1的5' UTR会改变基因表达并增加Cd积累.
- 鉴定了OsbHLH35作为一种转录因子,可以调节在Cd压力下OsPT1H-MITE的表达.
- 通过CRISPR-Cas9调解的OsPT1H-MITE或OsbHLH35的淘汰会使谷物中的Cd含量减少61.7%80.6%.
结论:
- 一种涉及OsPT1,H-MITE插入和OsbHLH35的新机制有助于大米中高Cd积累.
- OsPT1H-MITE和OsbHLH35是开发低Cd大米品种的潜在遗传标.
- 基因编辑为缓解大米中Cd污染提供了一个有希望的策略,以提高食品安全.
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