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使用AAV传递的Dendra2-标记的Rhodopsin可视化光受体外段的更新
Lijing Xie1,2, Dianlei Guo1,2, Xiaoyu Zhang1
1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou 510060, China.
bioRxiv : the preprint server for biology
|December 18, 2025
概括
研究人员开发了一种新方法,使用AAV传递的Dendra2融合蛋白来跟踪光受体外段 (OS) 在小鼠中的更新. 这种快速的工具克服了紧的光感应器结构带来的挑战,帮助视觉研究.
科学领域:
- 眼科医生 眼科 眼科
- 细胞生物学 细胞生物学
- 遗传学 遗传学 是一个
背景情况:
- 在小鼠中可视化光受体外段 (OS) 更新对于视力研究至关重要.
- 挑战包括小型,密集的光受体结构和缺乏有效的追踪工具.
- 生成转基因记者线是耗时的.
研究的目的:
- 为了评估可光转换的Rhodopsin/Dendra2和Peripherin2/Dendra2融合蛋白质的腺相关病毒 (AAV) 介导的输送.
- 建立一种快速的方法来跟踪鼠标光感受器中的OS更新动态.
- 为了克服由于紧的光感应器架构而导致的可视化操作系统更新的局限性.
主要方法:
- 在小鼠光受体中利用AAV介导的Rhodopsin/Dendra2和Peripherin2/Dendra2融合蛋白.
- 通过比较感染后不同时间点的本地Dendra2域长度来评估OS更新.
- 采用Dendra2光转换来区分单细胞内的新合成与现有的光受体盘.
主要成果:
- 通过使用AAV输送的Dendra2融合蛋白成功跟踪了小鼠光受体中的OS更新.
- 在野生类型小鼠和一个Tmem138缺乏的纤毛病突变体中验证了该方法.
- 观察到Tmem138缺乏突变体的OS更新率降低,证实了方法的灵敏度.
结论:
- 开发了一种快速的遗传工具,用于实时评估小鼠的OS更新动态.
- 克服了与紧和密集组织的光受体结构相关的重大挑战.
- 为推进视觉研究和理解操作系统更新过程提供了一种有价值的方法.
相关概念视频
01:11Channel Rhodopsins
Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
01:22Photoreceptors and Visual Pathways
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...