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Related Concept Videos

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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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Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
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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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Related Experiment Video

Updated: Dec 11, 2025

In Vitro Aggregation Assays Using Hyperphosphorylated Tau Protein
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Mitochondrial DNA Manipulations Affect Tau Oligomerization.

Ian W Weidling1,2,3, Heather M Wilkins1,2, Scott J Koppel1,2,3

  • 1University of Kansas Alzheimer's Disease Center; the University of Kansas Medical Center, Kansas City, KS, USA.

Journal of Alzheimer'S Disease : JAD
|August 18, 2020
PubMed
Summary

Mitochondrial DNA (mtDNA) levels influence tau aggregation in brain cells. Reduced mtDNA and dysfunction increase tau oligomerization, suggesting a link to Alzheimer's disease pathogenesis.

Keywords:
Alzheimer’s diseasemitochondriamitochondrial DNAoligomerstau

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Mitochondrial Biology

Background:

  • Mitochondrial dysfunction and tau aggregation are hallmarks of Alzheimer's disease (AD).
  • Mitochondrial toxins alter tau pathology in cellular and rodent models.

Purpose of the Study:

  • To investigate the direct impact of mitochondrial DNA (mtDNA) on tau oligomerization.
  • To determine if mtDNA alterations influence tau pathology in human neuronal cells relevant to AD.

Main Methods:

  • Human neuronal SH-SY5Y cells were subjected to acute and chronic mtDNA depletion.
  • Cell lines with chronic mtDNA depletion (ρ0 cells) were generated.
  • Cytoplasmic hybrid (cybrid) cell lines were created using mtDNA from AD subjects.

Main Results:

  • Acute mtDNA depletion impaired cytochrome oxidase activity.
  • Metabolic reprogramming was observed in ρ0 cells.
  • Reduced mtDNA content in AD cybrids correlated with increased tau oligomer levels and a monomer-to-oligomer shift.

Conclusions:

  • Cellular mtDNA content directly affects tau oligomerization.
  • Consistent tau changes across models confirm reproducibility.
  • Findings in AD cybrids support the relevance of mtDNA to AD pathology.