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Related Concept Videos

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...
Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial precursors...

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Related Experiment Video

Updated: May 31, 2026

Analyzing Supercomplexes of the Mitochondrial Electron Transport Chain with Native Electrophoresis, In-gel Assays, and Electroelution
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Mitochondrial complex 1 gene analysis in keratoconus.

Dhananjay Pathak1, Bhagabat Nayak, Manvendra Singh

  • 1Laboratory For Molecular Reproduction and Genetics, Department of Anatomy, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India.

Molecular Vision
|June 22, 2011
PubMed
Summary
This summary is machine-generated.

Mitochondrial complex I gene variations in keratoconus patients increase reactive oxygen species (ROS) production, leading to oxidative stress and corneal damage. Early antioxidant therapy is recommended to mitigate ROS-related harm in keratoconus.

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Published on: March 17, 2023

Area of Science:

  • Ophthalmology
  • Genetics
  • Molecular Biology

Background:

  • Keratoconus (KC) is a corneal disorder characterized by stromal thinning and vision loss, with an unknown etiology.
  • Oxidative stress (OS) is implicated in KC, but its precise mechanism remains unclear.
  • Mitochondrial complex I is a primary source of reactive oxygen species (ROS) production.

Purpose of the Study:

  • To investigate sequence variations in mitochondrial complex I genes in keratoconus patients.
  • To determine the role of mitochondrial dysfunction and oxidative stress in keratoconus pathogenesis.

Main Methods:

  • Sequencing of mitochondrial complex I genes (ND1-6) in 20 keratoconus patients and 20 controls.
  • Analysis of DNA sequences against the human mitochondrial reference genome.
  • Haplogroup frequency analysis using Principle Component Analysis (PCA).

Main Results:

  • Identified 84 nucleotide variations in keratoconus patients versus 29 in controls.
  • Detected 18 non-synonymous variations and two novel frame-shift mutations in cases, potentially increasing ROS and decreasing ATP.
  • Haplotype analysis revealed distinct clustering of keratoconus patients in specific haplogroups not prevalent in the general Indian population.

Conclusions:

  • Variations in mitochondrial complex I genes contribute to elevated ROS production and oxidative stress in keratoconus.
  • Oxidative stress initiates a cascade leading to keratoconus development.
  • Initiating prompt antioxidant therapy is crucial for minimizing ROS-related damage in keratoconus patients.