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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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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
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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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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
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Mitochondrial Toxicity.

Joel N Meyer1, Jessica H Hartman1, Danielle F Mello1

  • 1Nicholas School of the Environment and Integrated Toxicology and Environmental Health Program, Duke University, Durham, North Carolina 27708-0328.

Toxicological Sciences : an Official Journal of the Society of Toxicology
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Summary
This summary is machine-generated.

Mitochondrial toxicity from drugs and pollutants is rising, alongside genetic diseases. Understanding gene-environment interactions is key to addressing these complex health issues.

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Area of Science:

  • Biochemistry
  • Genetics
  • Toxicology

Background:

  • Mitochondrial diseases affect approximately 1 in 4,300 individuals.
  • Increasing reports link drugs and pollutants to adverse mitochondrial effects.
  • Genetic variations contribute significantly to mitochondrial dysfunction.

Observation:

  • Mitochondrial reactive oxygen species play a role in cell signaling.
  • Homeostasis involves DNA maintenance, stress response, fusion/fission, and biogenesis.
  • Mitochondrial stress impacts specific cell types and systemic functions.
  • Mitochondria are involved in immune function and long-term health effects.
  • Mitochondrial-epigenetic interactions and novel toxicity testing methods are emerging.

Findings:

  • Mitochondrial research is expanding into signaling, homeostasis, and systemic effects.
  • New approaches for chemical toxicity testing are being developed.
  • Hormetic effects of mitochondrial stressors warrant further investigation.

Implications:

  • Integrating clinical, lab, and epidemiological studies is crucial.
  • Biomarker development for human populations needs improvement.
  • Considering factors like diet, exercise, and age is vital for comprehensive mitochondrial health research.