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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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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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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 Precursor Proteins

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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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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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Related Experiment Video

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Using Live Cell STED Imaging to Visualize Mitochondrial Inner Membrane Ultrastructure in Neuronal Cell Models

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[Mitochondrial diseases; thinking beyond organ specialism necessary].

B W Smits¹, J A M Smeitink, B G M van Engelen

¹Universitair Medisch Centrum St Radboud, Postbus 9101, 6500 HB Nijmegen. b.smits@neuro.umcn.nl

Nederlands Tijdschrift Voor Geneeskunde

|November 18, 2008

Summary

Mitochondrial disorders disrupt cellular energy production, affecting multiple organs. Early recognition is crucial for patient care and avoiding harmful treatments.

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Area of Science:

Biochemistry
Genetics
Cell Biology

Background:

Mitochondrial disorders stem from impaired intracellular energy production.
These multi-system conditions predominantly impact organs with high energy demands.

Discussion:

Early diagnosis of mitochondrial disease is vital to reduce patient anxiety and prevent unnecessary investigations or treatments.
Consider mitochondrial disease with multi-organ dysfunction, high energy requirement issues, or a maternal family history.
Symptoms like exercise-induced muscle pain/weakness, or the combination of diabetes mellitus and deafness, are key indicators.

Key Insights:

Mitochondrial disorders are more common than often assumed.
Recognizing specific syndromes like CPEO, MIDDS, and Leber's hereditary optic neuropathy is important in adults.
A detailed family history, especially maternal, aids in diagnosis.

Outlook:

Ongoing research into causal treatments underscores the increasing importance of early and accurate diagnosis.
Improved diagnostic strategies will enhance patient outcomes and therapeutic development.