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相关概念视频

Mitochondria01:37

Mitochondria

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Animal Mitochondrial Genetics02:59

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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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Mutations01:39

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Overview
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Mutations01:35

Mutations

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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Mitochondrial Membranes01:45

Mitochondrial Membranes

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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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相关实验视频

Updated: Jan 6, 2026

Mitochondria
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非最佳的编码子使用会影响钟蛋白FRQ的表达,结构和功能.

Mian Zhou1, Jinhu Guo, Joonseok Cha

  • 1Department of Physiology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, Texas 75390, USA.

Nature
|February 19, 2013
PubMed
概括

在神经频率 (FRQ) 基因中,非最佳的编码子使用对于昼夜时钟功能至关重要. 优化编码子使用通过改变FRQ蛋白质结构和功能来破坏昼夜节律.

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相关实验视频

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科学领域:

  • 分子生物学分子生物学
  • 时间生物学 时间生物学
  • 遗传学 是一个遗传学.

背景情况:

  • 的使用偏差通常优化高表达基因的翻译效率.
  • 非最佳的编码子使用,虽然不太常见,但可能具有调节作用.
  • 神经菌频率 (FRQ) 蛋白质对于生理时钟的功能至关重要.

研究的目的:

  • 为了研究编码子在昼夜节律调节中的作用.
  • 为了确定frq基因中非最佳的编码子使用的功能意义.
  • 探索子使用如何影响FRQ蛋白质特性和昼夜时钟机制.

主要方法:

  • 对frq基因与其他神经菌基因中的子使用的比较分析.
  • 基因操纵是为了优化frq基因中的代使用.
  • 在野生型和子优化菌株中评估昼夜节律表型 (露面和分子).
  • 对FRQ蛋白水平,形状,酸化和稳定性的生物化学分析.

主要成果:

  • 该frq基因在整个开放的读取框架中表现出显著的非最佳编码子使用,与大多数其他基因形成鲜明对比.
  • 对于frq的Codon优化导致了公开和分子昼夜节律的完全废除.
  • 在子优化后,FRQ蛋白水平增加,同时蛋白质构成,酸化和稳定性发生了意想不到的变化.
  • 经过编码子优化后,在昼夜反循环中观察到FRQ功能受损.

结论:

  • 对frq基因的非最佳编码子使用对于神经的昼夜钟的正常运作至关重要.
  • 的使用不仅直接影响蛋白质表达水平,而且影响蛋白质的结构和功能.
  • 这项研究表明了一种新的机制,即非最佳的编码子使用在生物过程中,特别是昼夜节律中,作为一个调节元件.