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Related Concept Videos

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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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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Epigenetic Regulation01:37

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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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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Phase II Reactions: Methylation Reactions01:17

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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
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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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Methodology for Accurate Detection of Mitochondrial DNA Methylation
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[Mitochondrial DNA methylation: Controversies, issues and perspectives].

Émélie Leroux1, Cindy Brosseau1, Bernard Angers1

  • 1Département de sciences biologiques, Université de Montréal, Campus MIL, Faculté des Arts et des Sciences, CP 6128, Succursale Centre-Ville, Montréal QC, H3C 3J7, Canada.

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Summary

DNA methylation, crucial for gene regulation, is confirmed in mitochondria. This epigenetic modification, similar to bacteria, occurs mainly outside CpG sites, challenging previous debates.

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Area of Science:

  • Epigenetics
  • Mitochondrial Biology
  • Genomics

Background:

  • DNA methylation is a key epigenetic regulator of gene expression in nuclear genomes of eukaryotes and bacteria.
  • Mammalian DNA methylation predominantly occurs in CpG contexts, while bacterial methylation is typically non-CpG.
  • The presence and nature of DNA methylation in mitochondrial genomes remain controversial due to structural and technical challenges.

Purpose of the Study:

  • To investigate the existence and context of DNA methylation within the mitochondrial genome.
  • To reconcile conflicting data regarding mitochondrial DNA methylation.

Main Methods:

  • Utilizing novel techniques optimized for cytosine methylation analysis.
  • Comparative analysis of methylation patterns in mitochondrial DNA.

Main Results:

  • Evidence suggests that cytosine methylation does exist in mitochondrial DNA.
  • Mitochondrial DNA methylation is predominantly found in a non-CpG context.
  • These findings align with methylation patterns observed in bacteria.

Conclusions:

  • Cytosine methylation is a genuine epigenetic modification present in mitochondria.
  • The non-CpG context of mitochondrial methylation mirrors bacterial patterns, suggesting evolutionary links.
  • This discovery opens new avenues for understanding mitochondrial gene regulation and evolution.