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Animal Mitochondrial Genetics02:59

Animal Mitochondrial Genetics

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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X-chromosome...

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Bioenergetic Profile Experiment using C2C12 Myoblast Cells
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Published on: December 6, 2010

Energetics, epigenetics, mitochondrial genetics.

Douglas C Wallace1, Weiwei Fan

  • 1Center for Molecular and Mitochondrial Medicine and Genetics (MAMMAG), University of California, Irvine, CA 92697-3940, USA. dwallace@uci.edu

Mitochondrion
|October 3, 2009
PubMed
Summary
This summary is machine-generated.

Cellular bioenergetics, the process of energy production, interfaces with the epigenome, influencing gene expression. This connection impacts diseases, suggesting new therapeutic avenues for epigenetic and bioenergetic disorders.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cellular Metabolism

Background:

  • The epigenome acts as a bridge between environmental factors and nuclear DNA (nDNA) genes.
  • Environmental cues like calorie availability and energy demands influence cellular bioenergetic systems, including glycolysis and mitochondrial oxidative phosphorylation (OXPHOS).
  • Regulation of numerous bioenergetic genes across nDNA and mitochondrial DNA (mtDNA) requires complex cis and trans mechanisms.

Purpose of the Study:

  • To explore the hypothesis that cellular bioenergetics serves as the interface between the environment and the epigenome.
  • To investigate the role of bioenergetic metabolites (ATP, acetyl-CoA, SAM, NAD+) in epigenetic modifications like chromatin phosphorylation and acetylation.
  • To examine the link between mitochondrial dysfunction and epigenetic diseases.

Main Methods:

  • Review of existing literature on epigenetics, cellular bioenergetics, and their interplay.
  • Analysis of the molecular mechanisms by which bioenergetic pathways influence epigenetic marks.
  • Comparison of clinical phenotypes between bioenergetic and epigenetic diseases.

Main Results:

  • Abundant calories promote ATP and acetyl-CoA production, leading to chromatin phosphorylation and acetylation, thus enhancing nDNA transcription and replication.
  • Calorie restriction results in loss of chromatin modifications and suppressed gene expression.
  • Mitochondrial function impacts DNA methylation via SAM, and bioenergetic metabolites are crucial for regulating cellular signaling pathways.

Conclusions:

  • Cellular bioenergetics is a critical interface connecting environmental factors to epigenetic regulation.
  • The bioenergetic-epigenomic hypothesis provides a framework for understanding the etiology and pathophysiology of various diseases.
  • Similarities between bioenergetic and epigenetic diseases, along with links to mitochondrial dysfunction, highlight potential therapeutic targets.