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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 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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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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Mitochondria01:37

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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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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 Protein Sorting01:39

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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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Therapy Prospects for Mitochondrial DNA Maintenance Disorders.

Javier Ramón1,2, Ferran Vila-Julià1,2, David Molina-Granada1,2

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Summary

Mitochondrial DNA depletion and multiple deletions syndromes (MDDS) are severe genetic disorders. New treatments like gene therapy show promise, but rare disease patient recruitment for clinical trials remains a challenge.

Keywords:
depletiongene therapymitochondriamtDNAmultiple deletionsnucleosidereplicationtherapy

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Area of Science:

  • Biochemistry
  • Genetics
  • Molecular Biology

Background:

  • Mitochondrial DNA depletion and multiple deletions syndromes (MDDS) are debilitating mitochondrial diseases.
  • Dysfunctional mitochondrial DNA (mtDNA) replication and maintenance characterize these rare genetic disorders.
  • Current treatment options for MDDS are limited, with aggressive interventions like transplantation being rare alternatives.

Purpose of the Study:

  • To explore novel therapeutic strategies for MDDS, addressing the limited treatment landscape.
  • To highlight recent advancements in understanding the biochemical basis of mtDNA replication defects.
  • To review emerging treatments and their potential impact on these fatal diseases.

Main Methods:

  • Investigating small molecule substrate enhancement approaches for MDDS treatment.
  • Evaluating gene therapy vectors, including lentiviral and adeno-associated viral (AAV) vectors.
  • Analyzing the clinical progress and challenges of experimental MDDS therapies.

Main Results:

  • Significant progress has been made in understanding the pathomechanisms of mtDNA replication.
  • Experimental therapies, including gene therapy, have shown promising early clinical results.
  • The rarity of MDDS poses significant challenges for patient recruitment in clinical trials.

Conclusions:

  • Advances in understanding mtDNA replication offer new therapeutic avenues for MDDS.
  • Gene therapy and other novel approaches represent promising, albeit experimental, treatments.
  • Overcoming patient recruitment limitations is crucial for advancing clinical trials in rare mitochondrial diseases.