在花粉养甲虫中补充氨酸的内共生体的进化史
Jürgen C Wierz1,2, Matthew L Gimmel3, Selina Huthmacher2
1Department of Insect Symbiosis, Max Planck Institute for Chemical Ecology, 07745 Jena, Germany.
The ISME journal
|June 11, 2024
概括
昆虫细菌共生体为皮膜发育提供必要的氨酸,即使在从食肉幼虫到花粉养成人的各种饮食的甲虫中也是如此. 这种古老的联系突出了跨越各种昆虫生态的共生体益处.
科学领域:
- 昆虫微生物学 昆虫微生物学
- 进化生物学是进化的生物学.
- 这种共生是共生.
背景情况:
- 许多昆虫依赖细菌共生体来克服挑战性饮食中的营养不足.
- 在具有多种食策略的昆虫中共生者的作用,包括捕食和 pollenivory,不太了解.
- 软翅花甲虫 (Melyridae, Dasytinae) 的饮食从幼虫食/肉食转变为成人食.
研究的目的:
- 研究Dasytinae甲虫中的玛蛋白细菌共生体"Candidatus Dasytiphilus stammeri"的进化史和功能意义.
- 了解共生体对具有复杂生命周期和饮食的宿主的代谢贡献.
- 为了探索共生体的获取,编码多样化和损失的动态,在Melyridae家族.
主要方法:
- 在Dasytinae甲虫系中对共生物分布的家族遗传学分析.
- 对20个"候选Dasytiphilusstammeri"菌株进行基因组分析.
- 比较基因组学以确定保存和可变的代谢途径.
主要成果:
- 该共生体起源于单个收购事件,随后是宿主-共生体编码多样化和多个独立的共生体损失.
- 交生体基因组受到高度侵蚀,但shikimate通路被普遍保留,这表明皮质硬化和黑色化为皮质硬化和黑色化提供.
- 合成必需氨基酸,维生素和尿素循环的途径的可变保留表明共生菌株之间的生态专业化.
结论:
- 细菌共生体补充氨酸对各种养生态中的昆虫来说是一个关键的好处,包括那些有食肉幼虫和花粉养成人的昆虫.
- 这项研究扩大了已知的昆虫与共生体相互作用的范围,以及氨酸在昆虫生理学中的重要性.
- 主体-共生体编码多样化和损失动态为这些协会的长期进化轨迹提供了洞察力.
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