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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 shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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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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Related Experiment Video

Updated: Feb 6, 2026

Evaluation of Blood Lactate and Plasma Insulin During High-intensity Exercise by Antecubital Vein Catheterization
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Lactate-driven mitochondrial pretenders hijack hippocampal function after excessive exercise.

Filip J Larsen1

  • 1Department of Physiology, Nutrition and Biomechanics, The Swedish School of Sport and Health Sciences, GIH, Stockholm, Sweden.

Cell Metabolism
|February 4, 2026
PubMed
Summary

Vigorous exercise shows a J-shaped effect on cognitive decline, with optimal benefits around 1,000-1,300 MET-minutes/week. Excessive physical activity can harm cognitive function by disrupting brain synapses.

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Area of Science:

  • Neuroscience
  • Exercise Physiology
  • Biochemistry

Background:

  • Physical activity levels influence cognitive health.
  • The precise dose-response relationship between exercise intensity and cognitive decline remains unclear.
  • Understanding the molecular mechanisms linking exercise and brain function is crucial.

Purpose of the Study:

  • To elucidate the J-shaped relationship between vigorous physical activity and cognitive decline.
  • To identify the threshold for excessive exercise that may impair cognition.
  • To investigate the underlying biological mechanisms, including the role of lactate and mitochondria-derived vesicles.

Main Methods:

  • Analysis of UK Biobank data.
  • Application of mechanistic modeling.
  • Conducting a randomized controlled trial (RCT).

Main Results:

  • A J-shaped curve was observed, indicating maximal cognitive benefits at approximately 1,000-1,300 MET-minutes/week of vigorous activity.
  • Excessive exercise levels were associated with cognitive impairment.
  • Lactate-driven mitochondria-derived vesicles were implicated in disrupting hippocampal synapses and impairing cognition.

Conclusions:

  • The relationship between vigorous exercise and cognitive decline is non-linear, with a defined optimal range.
  • Overtraining may negatively impact cognitive function.
  • Mitochondria-derived vesicles, particularly those driven by lactate, represent a potential mechanism for exercise-induced cognitive changes.