番茄根的特殊代谢物通过基因重复和生物合成基因集群中的调控分歧进化
Rachel E Kerwin1, Jaynee E Hart1, Paul D Fiesel1
1Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, USA.
Science advances
|April 24, 2024
概括
植物的代谢多样性是由专门的途径驱动的. 这项研究揭示了酸糖生物合成如何在Solanaceae中演变,其中一个关键基因复制并将表达从三合体转移到根.
科学领域:
- 植物生物化学和分子进化.
- 基因组学和代谢途径演变.
- 在Solanaceae中的特殊代谢物生物合成.
背景情况:
- 植物的代谢多样性源于专门的代谢途径,通常局部化在特定的组织中,有时组织成生物合成基因集群 (BGCs).
- 空间表达模式的演变以及BGCs在路径演变中的作用尚未完全理解.
- 以前在Solanaceae腺状三合体中已知的酸糖最近在种植的番茄根中被发现.
研究的目的:
- 研究Solanaceae家族中乙烯酸糖生物合成背后的进化机制.
- 了解如何在三合体和根基中建立酸糖的生产.
- 确定根特异性酸糖生产的遗传基础及其进化起源.
主要方法:
- 在番茄根和三合体中对乙糖进行比较分析,以确定糖核中的差异.
- 已知三酸糖路径基因的根丰富对应基因的识别和特征.
- 基因表达分析和遗传学研究,以追踪关键酸糖生物合成基因的进化史,包括SlASAT1-LIKE (SlASAT1-L).
主要成果:
- 来自种植番茄根和三合体的糖具有不同的糖核.
- 鉴定出了三基酸糖路径基因的根特异类型,包括Slasat1-L,这对根酸糖生物合成至关重要.
- SlASAT1-L 嵌在已知的三基酸糖 BGC 内部,起源于 ASAT1 的重复,最初在三基体中表达,然后在Solanum 属中演变为根特异表达.
结论:
- 在Solanaceae中,乙糖生物合成的演化涉及基因重复和新功能化,导致代谢途径的空间多样化.
- 生物合成基因集群在特殊代谢的进化和调节中发挥作用.
- 了解这些机制,可以深入了解植物代谢多样性的基因组基础.
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