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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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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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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
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The Inner Mitochondrial Membrane01:28

The Inner Mitochondrial Membrane

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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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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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Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
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相关实验视频

Updated: Feb 28, 2026

Identification of Circular RNAs using RNA Sequencing
08:25

Identification of Circular RNAs using RNA Sequencing

Published on: November 14, 2019

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与衰老相关的线粒体圆形RNAs.

Hyejin Mun1, Do-Won Ham2, Nam Chul Kim2

  • 1Department of Oncology Science, University of Oklahoma, Oklahoma City, OK 73104, USA.

Aging
|February 26, 2026
PubMed
概括
此摘要是机器生成的。

循环MT-RNR2RNA在衰老和衰老过程中被耗尽. 这种线粒体RNA可能通过TCA循环调节葡萄糖代谢,影响细胞健康.

关键词:
在 GRSF1 中,GRSF1 包含了 GRSF1 和 GRSF1.在 MT-RNR2 中,在TCA循环中,TCA循环是老化的老化 衰老的老化圆形的RNARNA是一个圆形的RNA.

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相关实验视频

Last Updated: Feb 28, 2026

Identification of Circular RNAs using RNA Sequencing
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Identification of Circular RNAs using RNA Sequencing

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Understanding the Changes in Mitochondrial Morphology through Dynamic and Three-dimensional Fluorescence Micrographs
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Imaging and Quantifying Mitochondrial Morphology in C. elegans During Aging
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Imaging and Quantifying Mitochondrial Morphology in C. elegans During Aging

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科学领域:

  • 线粒体生物学 线粒体生物学
  • RNA生物学的RNA生物学
  • 衰老的研究研究.

背景情况:

  • 非编码RNA在哺乳动物衰老过程中发生变化.
  • 线粒体循环RNA的理解很少.
  • 已知在衰老过程中发生的全球转录组和表转录组变化.

研究的目的:

  • 在年轻和年老的人类队伍中概述线粒体圆形RNA.
  • 研究线粒体循环RNAs的功能,特别是MT-RNR2.
  • 探索GRSF1在调节线粒体循环RNA和细胞衰老中的作用.

主要方法:

  • 在年轻和年老的队列中,从线粒体染色体 (chrM) 进行圆形RNA的剖析.
  • 用线粒体转录 (线性和圆形MT-RNR2) 对GRSF1的RNA结合分析.
  • 评估GRSF1耗尽对circMT-RNR2水平,TCA循环酶和人类纤维细胞细胞衰老的影响.

主要成果:

  • 在MT-RNR2.2中发现了最丰富的线粒体圆形RNA结.
  • 在老年人和衰老的纤维细胞中,MT-RNR2水平降低了.
  • GRSF1与线性和圆形MT-RNR2结合,其耗尽加速了衰老和线粒体功能障碍.

结论:

  • 循环MT-RNR2存在,其水平在人类衰老和衰老过程中下降.
  • 循环MT-RNR2可能在促进TCA循环中发挥作用.
  • 线粒体循环RNA,如circMT-RNR2,可能参与调节细胞代谢和衰老.