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Related Concept Videos

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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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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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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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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ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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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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Analysis of Brain Mitochondria Using Serial Block-Face Scanning Electron Microscopy
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Mitochondrial function in development and disease.

Marlies P Rossmann1,2, Sonia M Dubois3, Suneet Agarwal3

  • 1Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA 01238, USA.

Disease Models & Mechanisms
|June 11, 2021
PubMed
Summary
This summary is machine-generated.

Mitochondria, the cell powerhouses, are crucial signaling organelles involved in homeostasis, adaptation, and cell fate. Mitochondrial dysfunction impacts various diseases, making them key research targets for development, aging, and therapeutics.

Keywords:
Mitochondrial diseasesMitochondrial fusion and fissionMitochondrial unfolded protein responseMitophagymtDNA heteroplasmy and inheritancemtDNA-mediated innate immune response

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Mitochondria, known as cellular powerhouses, perform essential functions beyond energy production, including signaling.
  • They play critical roles in maintaining cellular homeostasis, adapting to stress, and directing cell fate.
  • Mitochondrial dysfunction is implicated in numerous diseases, highlighting their importance in health and pathology.

Purpose of the Study:

  • To provide a foundational understanding of mitochondrial structure, dynamics, and quality control.
  • To explore mitochondria's role in cross-organelle communication and innate immunity.
  • To review mitochondrial DNA inheritance, mutation effects, and therapeutic strategies for mitochondrial diseases.

Main Methods:

  • Review of existing literature on mitochondrial biology, disease, and genetics.
  • Synthesis of information on mitochondrial dynamics, quality control, and inter-organelle communication.
  • Analysis of data concerning mitochondrial DNA inheritance and mutation impacts.

Main Results:

  • Mitochondria are central signaling organelles influencing cellular homeostasis, stress adaptation, and cell fate.
  • Mitochondrial dysfunction is linked to neurodegeneration, immunity, infectious diseases, and aging.
  • Mitochondrial DNA mutations significantly affect cellular and organismal fitness.

Conclusions:

  • Mitochondria are integral to cellular function, development, disease, and aging.
  • Understanding mitochondrial dynamics and communication is crucial for addressing mitochondrial diseases.
  • Current therapeutic approaches for mitochondrial diseases are being developed and tested in model organisms and humans.