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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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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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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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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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Mitochondria and mitochondrial disorders: an overview update.

Vibhuti Rambani1, Dominika Hromnikova1, Daniela Gasperikova1

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Mitochondrial diseases (MDs) stem from energy metabolism defects, affecting 1:1470 newborns. Understanding the genetic basis of mitochondrial dysfunction is key to developing effective treatments for these progressive inherited disorders.

Keywords:
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Area of Science:

  • Cell Biology
  • Genetics
  • Biochemistry

Background:

  • Mitochondria generate cellular energy (ATP) and regulate vital functions like cell signaling, metabolism, growth, and death.
  • Primary mitochondrial diseases (MDs) are inherited disorders caused by malfunctions in mitochondrial energy metabolism.
  • MDs are clinically and genetically diverse, affecting 1:1470 newborns and posing a significant societal burden due to their progressive nature and variable symptoms.

Purpose of the Study:

  • To provide an updated overview of mitochondrial biology.
  • To review genes associated with mitochondrial diseases (MDs).
  • To highlight the importance of understanding mitochondrial pathogenicity mechanisms for developing effective treatments.

Main Methods:

  • Literature review of mitochondrial biology and genetics.
  • Analysis of genetic causes of mitochondrial diseases (MDs).
  • Synthesis of current knowledge on mitochondrial function and dysfunction.

Main Results:

  • Mitochondria are crucial for cellular energy production and various other functions.
  • MDs result from genetic defects in over 400 genes affecting mitochondrial function and over 1200 nuclear genes involved in mitochondrial activities.
  • The genetic etiology of MDs is complex, involving both mitochondrial DNA (mtDNA) and nuclear DNA mutations.

Conclusions:

  • Understanding the genetic basis and pathogenicity mechanisms of mitochondrial diseases is essential for therapeutic development.
  • Further research into mitochondrial biology and associated genes is critical for improving patient outcomes.
  • Effective treatments for MDs require a comprehensive understanding of how genetic mutations impact mitochondrial function.