神经球蛋白中的自然变异调整了野生动物的氧气感应Caenorhabditis elegans
Annelie Persson1, Einav Gross, Patrick Laurent
1MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 0QH, UK.
Nature
|March 6, 2009
概括
凯诺哈比迪斯使用全球蛋白GLB-5和瓜尼酸环酶来感知氧气,切换大气层附近的食行为. 这揭示了响应环境线索的行为进化的分子机制.
科学领域:
- 神经科学是一个神经科学.
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- 行为进化是由自然选择驱动的,但潜在的分子和神经机制尚未得到充分理解.
- 凯诺哈比迪斯 (Caenorhabditis elegans) 呈现出由环境因素影响的复杂的食行为.
研究的目的:
- 为了研究依赖氧气的食行为交换机在Caenorhabditis elegans的分子和神经基础.
- 为了确定涉及到感知环境氧度微妙变化的特定蛋白质.
主要方法:
- 利用成像来监测神经元活动,以应对氧气水平的变化.
- 研究了六合协调型球蛋白GLB-5和可溶性酸环酸酶 (GCY-35) 在氧气感应中的作用.
- 研究了遗传变异的影响,包括神经受体NPR-1,对这些行为.
主要成果:
- 野生菌株的Caenorhabditis elegans会根据微妙的氧气度变化改变寻行为.
- 全球蛋白GLB-5和酸氨酸循环酶GCY-35精确调节大气氧水平 (21%) 附近的氧感应神经元.
- GLB-5 和 GCY-35 分别调节神经元激活和抑制,以应对氧气水平的上升和下降.
结论:
- GLB-5和酸环酶作为氧气传感器,在狭窄的,生物相关的氧气范围内调节食行为.
- 自然发生的基因变异,如GLB-5和NPR-1,塑造神经电路功能和行为反应.
- 这项研究为环境感知如何推动行为进化提供了分子洞察力.
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