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Related Concept Videos

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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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 Precursor Proteins01:39

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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.
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Electron Transport Chain: Complex I and II01:46

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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.
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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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ATP Synthase: Mechanism01:48

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Author Spotlight: Decoding Mitochondrial Aging
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Mitochondrial Diseases: Hope for the Future.

Oliver M Russell1, Gráinne S Gorman2, Robert N Lightowlers3

  • 1Wellcome Centre for Mitochondrial Research, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4HH, UK; Clinical and Translational Research Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4HH, UK.

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|March 30, 2020
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Summary
This summary is machine-generated.

Mitochondrial diseases stem from genetic mutations. Current treatments manage symptoms, but new therapies like small molecules, gene therapies, and germline interventions aim to correct the underlying defects.

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Area of Science:

  • Genetics
  • Biochemistry
  • Molecular Biology

Background:

  • Mitochondrial diseases are a diverse group of genetic disorders.
  • Current treatments primarily offer symptomatic relief, not addressing the root cause.

Purpose of the Study:

  • To review recent advancements in treating mitochondrial diseases.
  • To explore novel therapeutic strategies and preventative measures.

Main Methods:

  • Literature review of small molecule therapies.
  • Analysis of gene therapy approaches.
  • Examination of germline transmission prevention techniques.

Main Results:

  • Emerging small molecule drugs show promise in targeting specific defects.
  • Gene therapies are advancing for nuclear and mitochondrial DNA mutations.
  • Germline interventions offer potential for preventing disease inheritance.

Conclusions:

  • Significant progress is being made in developing targeted treatments for mitochondrial diseases.
  • A combination of therapeutic strategies and preventative methods is crucial for managing these disorders.