概括
菌转移T-DNA到植物,形成瘤. 这项研究揭示了T-DNA边界的重复DNA序列,这对于细菌基因转移到宿主细胞至关重要.
科学领域:
- 分子生物学分子生物学
- 植物病理学 植物病理学
- 遗传学 遗传学 是一个
背景情况:
- Agrobacterium tumefaciens通过从其Ti等离子体中转移T-DNA来诱发植物上的瘤.
- 该A6S/2瘤含有来自八类型A6Ti等离子体的13kB的T-DNA插入物.
研究的目的:
- 为了确定A6 Ti等离子体T区域左端的DNA序列.
- 在A6S/2瘤中分析相应的T-DNA序列.
- 研究重复序列在T-DNA转移中的作用.
主要方法:
- 对T区域和T-DNA进行DNA测序.
- 异重复分析. 异重复分析.
- 比较序列分析.比较序列分析.
主要成果:
- 在T-区域和T-DNA的左端序列至少在806 bp.相同.
- 瘤T-DNA含有五个直接或倒置的重复,这些重复在Ti等离子体中不存在.
- 在T-DNA的右端存在520 bp的反向重复.
- 重复的序列类似于在12型腺病毒中发现的序列.
结论:
- 在T-DNA末端的重复序列对T-DNA转移具有重要意义.
- 在左结处的一个特定的23bp序列可能对从细菌转移到植物的DNA至关重要.
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