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相关概念视频

Channel Rhodopsins01:11

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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,...
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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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,...
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In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
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Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
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相关实验视频

Updated: Mar 26, 2026

A Rhodopsin Transport Assay by High-Content Imaging Analysis
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在共享动机中的单基对差异决定了差异性Rhodopsin表达

Jens Rister1, Ansa Razzaq1, Pamela Boodram1

  • 1Center for Developmental Genetics, Department of Biology, New York University, 100 Washington Square East, New York, NY 10003-6688, USA.

Science (New York, N.Y.)
|January 20, 2016
PubMed
概括

基因调节动机的单基对变化允许多种感觉神经元亚型的进化. 这种机制为特定的光受体功能微调基因表达,使各种刺激的检测成为可能.

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科学领域:

  • 神经科学
  • 遗传学
  • 分子生物学

背景情况:

  • 神经元的身份和功能是由终端分化基因决定的.
  • 具有特定动机的调节区域控制这些基因.
  • 了解转录因子如何整合输入对于细胞类型规范至关重要.

研究的目的:

  • 为了比较Drosophila Rhodopsin和光传导基因的调节机制.
  • 调查调控序列如何整合转录因子输入.
  • 阐明特定基因在细胞类型特定基因表达中的作用.

主要方法:

  • 在Drosophila光受体基因中的调节机制的比较分析.
  • 分享和分歧的监管理由的识别和描述.
  • 在调节序列中检查单基对替代.

主要成果:

  • 罗多普辛和光传导基因都具有11个基对激活基因.
  • 广泛表达的基因在所有光受体中都使用了平行象形的表达模式.
  • 罗多普辛基因表现出单基对替代,为子集表达创造特定的动机.

结论:

  • 感官神经元亚型通过短调节动机的单基对变化演变.
  • 这些变化允许生成激活器或抑制器图案.
  • 这种机制可以通过不同的光受体子集来区分广泛的刺激.