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相关概念视频

Vision01:24

Vision

53.4K
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.
53.4K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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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...
7.1K
Visual System01:26

Visual System

585
Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
585

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相关实验视频

Updated: Jul 6, 2025

Single-cell Profiling of Developing and Mature Retinal Neurons
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视觉皮层中细胞类型和视觉依赖的转录组程序之间的相互作用的空间描述.

Fangming Xie1,2, Saumya Jain1,3,2, Runzhe Xu1,2

  • 1Department of Biological Chemistry, Howard Hughes Medical Institute, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA.

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概括
此摘要是机器生成的。

早期的视觉体验通过改变神经元基因表达来塑造哺乳动物大脑发育. 这项研究揭示了视觉如何影响视觉皮质在关键发育时期的2/3层细胞类型.

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科学领域:

  • 神经科学是一个神经科学.
  • 发育生物学 发展生物学
  • 基因组学就是基因组学.

背景情况:

  • 早期的感官体验对大脑发育至关重要,特别是在关键时期.
  • 哺乳动物新皮质中神经元细胞类型的组织受产后感官输入的影响.
  • 层2/3 (L2/3) 谷氨基基神经元是皮层中经验依赖可塑性和学习的关键位置.

研究的目的:

  • 研究视觉体验如何影响初级视觉皮层L2/3细胞类型的空间组织和分子概况 (V1).
  • 了解视觉剥夺引起的L2/3神经元的转录组变化.
  • 阐明在产后发育过程中视觉模式皮质细胞类型的机制.

主要方法:

  • 在V1中使用大约500个基因对L2/3细胞类型的空间转录基因分析.
  • 应用多任务理论来建模基因表达特征作为2D多重组.
  • 从正常养和深色养小鼠的转录组数据进行比较.
  • 空间转录基因数据与单核RNA-seq数据的整合.

主要成果:

  • 空间转录学揭示了L2/3细胞类型在V1.1中沿着平-心室轴的区分.
  • 视觉剥夺诱导了两个独立的基因表达程序:一个影响细胞状态 (与细胞类型直角),另一个改变细胞类型身份.
  • 视觉剥夺改变了L2/3细胞在转录组连续体内的分布,减少了B型和C型细胞,同时增加了A型细胞.
  • L2/3细胞类型的空间组织与连续的基因表达特征联系在一起,以2D多重体的形式表示.

结论:

  • 在出生后的发育过程中,视觉体验对L2/3皮层细胞类型的组织和身份产生了重要影响.
  • 视觉剥夺导致明显的转录基因变化,影响细胞状态和细胞类型组成.
  • 这些发现提供了关于感官体验如何塑造神经电路的见解,从而影响大脑的布线,功能和行为.