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Animal Mitochondrial Genetics02:59

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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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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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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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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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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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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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Primary mitochondrial diseases.

Chiara Pizzamiglio1, Michael G Hanna1, Robert D S Pitceathly1

  • 1Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology, London, United Kingdom; NHS Highly Specialised Service for Rare Mitochondrial Disorders, Queen Square Centre for Neuromuscular Diseases, National Hospital for Neurology and Neurosurgery, London, United Kingdom.

Handbook of Clinical Neurology
|September 25, 2024
PubMed
Summary
This summary is machine-generated.

Primary mitochondrial diseases (PMDs) are genetic metabolic disorders affecting the respiratory chain. Leukoencephalopathy, indicated by specific MRI findings, suggests PMD and requires genetic diagnosis for proper management.

Keywords:
Brain MRIKearns-Sayre syndromeLeber hereditary optic neuropathyLeigh diseaseLeukoencephalopathyMitochondrial DNA maintenance disordersMitochondrial aminoacyl-tRNA synthetase disordersMitochondrial encephalomyopathy lactic acidosis and stroke-like episodesMitochondrial neurogastrointestinal encephalomyopathyPrimary mitochondrial diseases

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Area of Science:

  • Neurology
  • Genetics
  • Metabolic Disorders

Background:

  • Primary mitochondrial diseases (PMDs) are common genetic metabolic disorders impacting the mitochondrial respiratory chain.
  • Leukoencephalopathy is a significant feature in many PMDs, stemming from mitochondrial or nuclear DNA mutations.
  • PMDs affect approximately 1 in 4,300 individuals.

Purpose of the Study:

  • To outline PMDs associated with white matter involvement.
  • To detail clinical presentations, MRI findings, and differential diagnoses for these conditions.
  • To discuss diagnostic approaches and management strategies for PMDs.

Main Methods:

  • Review of PMDs with leukoencephalopathy, including genetic causes (mtDNA and nDNA).
  • Analysis of clinical and neuroimaging (brain MRI) features.
  • Discussion of diagnostic criteria and genetic testing approaches.

Main Results:

  • Specific brain MRI features (e.g., cyst-like lesions, basal ganglia involvement) aid in suspecting PMD in patients with leukoencephalopathy.
  • A complex neurological or multisystem disorder combined with characteristic MRI findings supports a PMD diagnosis.
  • Genetic diagnosis is essential for personalized care and clinical trial eligibility.

Conclusions:

  • PMDs with leukoencephalopathy require consideration based on clinical and MRI evidence.
  • Establishing a genetic diagnosis is critical for patient management, counseling, and research participation.
  • Multidisciplinary input and genetic confirmation are key for addressing these complex disorders.