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Related Concept Videos

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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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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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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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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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Microsporidia are a group of obligate intracellular fungi that were initially classified as protists but were later reclassified based on phylogenetic, molecular, and structural evidence linking them to the Chytridiomycota. These unicellular, non-motile organisms are highly specialized parasites that infect a wide range of animal hosts, including humans. They have evolved extensive genomic and metabolic reductions, making them highly dependent on their hosts for survival.Morphology and Genomic...
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Translocation of Proteins into the Mitochondria01:19

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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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Mitochondria: A Covert Chronic Infection Masquerading as a Symbiotic Partner?

George B Stefano1

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Summary
This summary is machine-generated.

Mitochondria, originating from bacteria, are viewed as symbionts. This perspective reframes them as a successful, long-term chronic infection uniquely adapted within eukaryotic hosts.

Keywords:
chronic infectioneukaryotic cellevolutionmitochondriasymbiosis

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Area of Science:

  • Cell biology
  • Evolutionary biology
  • Microbiology

Background:

  • Mitochondria originated from an ancestral aerobic alpha-proteobacterium.
  • Numerous parallels exist between mitochondria and facultative pathogenic bacteria.
  • Mitochondria are commonly termed "symbionts" in eukaryotic cells.

Purpose of the Study:

  • To explore mitochondrial structure and function.
  • To re-evaluate the role of mitochondria within host cells.
  • To consider mitochondria as a model for chronic bacterial infection.

Main Methods:

  • Comparative analysis of mitochondrial and bacterial characteristics.
  • Review of existing literature on mitochondrial biology and host-pathogen interactions.
  • Conceptual framework development based on infection biology.

Main Results:

  • Mitochondria exhibit unique adaptations for survival within eukaryotic hosts.
  • The "chronic infection" model offers new insights into mitochondrial function.
  • This perspective highlights the long-term evolutionary success of this intracellular relationship.

Conclusions:

  • Reframing mitochondria as a chronic infection provides a novel lens for understanding their biology.
  • This viewpoint may illuminate host-pathogen interactions and cellular adaptation.
  • Further research can explore the implications of this "infection" model for mitochondrial and cellular health.