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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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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.
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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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Related Experiment Video

Updated: Nov 16, 2025

Author Spotlight: An Optimized Automated Method for Investigating Retinoic Acid Receptors in Neuronal Mitochondria
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Applying genomic and transcriptomic advances to mitochondrial medicine.

William L Macken1, Jana Vandrovcova1, Michael G Hanna1

  • 1Department of Neuromuscular Diseases, UCL Queen Square Institute of Neurology and The National Hospital for Neurology and Neurosurgery, London, UK.

Nature Reviews. Neurology
|February 24, 2021
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Summary

Next-generation sequencing (NGS) advances genetic diagnosis for primary mitochondrial diseases (PMDs). New genomic and transcriptomic approaches improve whole-genome sequencing and identify novel disease causes.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Medical Genomics

Background:

  • Next-generation sequencing (NGS) has improved understanding of primary mitochondrial diseases (PMDs).
  • Many patients with suspected PMDs still lack a genetic diagnosis, hindering treatment and research.
  • Current genetic testing methods have limitations and are time-consuming.

Purpose of the Study:

  • To review current genetic testing for PMDs.
  • To explore the potential of whole-genome NGS for nuclear and mitochondrial DNA (mtDNA).
  • To discuss advanced genomic and transcriptomic solutions for PMD diagnosis.

Main Methods:

  • Review of current genetic testing strategies for PMDs.
  • Discussion of whole-genome NGS for nuclear and mtDNA.
  • Exploration of long-read sequencing for mtDNA and nuclear variants.
  • Examination of RNA sequencing applications for splicing and gene expression variants.

Main Results:

  • Whole-genome NGS offers improved diagnostic capabilities for PMDs.
  • Long-read sequencing can enhance mtDNA analysis and identify novel nuclear causes.
  • RNA sequencing effectively detects splicing defects and rare variants in mitochondrial transfer RNAs.

Conclusions:

  • Genomic and transcriptomic advances provide solutions to current PMD diagnostic challenges.
  • Increased clinical use of whole-genome NGS is recommended for PMD diagnosis.
  • Novel sequencing approaches promise to improve genetic counseling and patient outcomes for PMDs.