在Lymnaea stagnalis中的光学光感受的功能性特征
Alicia N Harracksingh1, Julia Bandura1, Takefumi Morizumi2
1Departments of Physiology, Temerty Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.
PloS one
|November 12, 2024
概括
淡水牛Lymnaea stagnalis对光有积极的反应,显示出独特的视觉机制. 这项研究将其确立为理解光学摄影接收及其演变的关键模型.
科学领域:
- 神经科学是一个神经科学.
- 进化生物学 进化生物学
- 动物学 动物学
背景情况:
- 光学摄影对动物的生存至关重要,但无脊椎动物的视觉系统,特别是在软体动物中,仍未得到充分研究.
- 用各种动物模型来研究视觉功能,但关于软体动物的光感知行为和视网膜处理存在知识差距.
研究的目的:
- 探索淡水池牛 Lymnaea stagnalis 的视觉功能和潜在机制.
- 描述L. stagnalis的眼睛结构及其光学反应.
- 研究L. stagnalis中的光传导基因的进化方面.
主要方法:
- 对L. stagnalis眼睛结构的解剖学和组织学分析.
- 开发一种新的神经行为协议来评估光触反应.
- 使用DeepLabCut精确跟踪和量化牛的运动.
- 对光传导基因的遗传学和蛋白质结构分析.
主要成果:
- 莱姆尼亚 (Lymnaea stagnalis) 具有结构连接和罗多素阳性感官细胞,对于光传导至关重要.
- 牛表现出积极的光毒性,指向强烈的焦点光的运动,具有多样化的光-运动反应.
- L. stagnalis表现出脊椎动物和无脊椎动物光传导基因的独特组合.
- 与其他软体动物和脊椎动物相比,一个特征化的罗多普辛类基因显示出明显的特征,这表明了新的光传导途径.
结论:
- 莱姆尼亚 (Lymnaea stagnalis) 已被确立为一种有价值的模型生物体,用于研究光学摄影.
- 这些发现为物种之间视觉功能的演变和多样性提供了新的见解.
- L. stagnalis独特的遗传和行为特征为进一步研究光传导机制提供了一个平台.
相关概念视频
Channel Rhodopsins
2.5K
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,...
2.5K
Photoreceptors and Visual Pathways
5.7K
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,...
5.7K
Anatomy of the Eyeball
6.0K
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
6.0K
Vision
52.9K
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
52.9K
The Retina
67.7K
The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
67.7K


