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Related Concept Videos

Mitochondrial Membranes01:45

Mitochondrial Membranes

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,...
Mitochondrial Membranes01:45

Mitochondrial Membranes

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,...
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.
ROS generation is regulated and maintained at moderate levels necessary...
Hepatic Encephalopathy01:29

Hepatic Encephalopathy

DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...
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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 ATP...
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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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Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models
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Cognitive dysfunction in mitochondrial disorders.

J Finsterer1

  • 1Danube University Krems, Krems and Krankenanstalt Rudolfstiftung, Vienna, Austria. fifigs1@yahoo.de

Acta Neurologica Scandinavica
|February 17, 2012
PubMed
Summary
This summary is machine-generated.

Cognitive impairment is a common central nervous system symptom in mitochondrial disorders (MIDs). Early diagnosis of mitochondrial cognitive dysfunction is crucial for effective patient management, though treatments remain largely supportive.

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Area of Science:

  • Neurology
  • Genetics
  • Mitochondrial Biology

Background:

  • Cognitive impairment is a significant central nervous system (CNS) manifestation of mitochondrial disorders (MIDs).
  • Mitochondrial cognitive dysfunction is increasingly recognized and diagnosed in clinical practice.
  • MIDs can stem from mutations in mitochondrial DNA (mtDNA) or nuclear DNA (nDNA).

Purpose of the Study:

  • To review recent findings on the etiology, pathogenesis, diagnosis, and treatment of cognitive decline in MIDs.
  • To highlight the spectrum of MIDs associated with cognitive impairment.
  • To emphasize the importance of accurate diagnosis for optimal patient care.

Main Methods:

  • Literature review of syndromic and non-syndromic MIDs.
  • Analysis of genetic causes (mtDNA and nDNA mutations) linked to cognitive decline.
  • Synthesis of current diagnostic approaches and therapeutic strategies.

Main Results:

  • Cognitive impairment is observed in numerous syndromic MIDs, including MELAS, MERRF, and Kearns-Sayre syndrome (mtDNA mutations).
  • Cognitive decline is also reported in syndromic MIDs caused by nDNA mutations, such as Leigh syndrome and Wolfram syndrome.
  • Non-syndromic MIDs, resulting from both mtDNA and nDNA mutations, can present with cognitive impairment as a primary or sole CNS manifestation.

Conclusions:

  • Cognitive impairment is a key CNS feature across a wide range of syndromic and non-syndromic mitochondrial disorders.
  • Distinguishing mitochondrial cognitive impairment from other cognitive deficits is essential for tailored management.
  • Current treatment for mitochondrial cognitive impairment primarily involves symptomatic and supportive measures.