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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...
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Genome Copying Errors

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Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Translation01:31

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Translation Produces the Building Blocks of Life

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An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model
06:05

An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model

Published on: March 9, 2022

Defects in mitochondrial DNA replication and human disease.

William C Copeland1

  • 1Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences, Durham, North Carolina 27709, USA. copelan1@niehs.nih.gov

Critical Reviews in Biochemistry and Molecular Biology
|December 20, 2011
PubMed
Summary

Genetic defects in mitochondrial DNA (mtDNA) replication and nucleotide metabolism cause mitochondrial genetic diseases. This review details genetic defects in mtDNA replication and nucleotide metabolism leading to mtDNA instability and disease.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Mitochondrial DNA (mtDNA) replication is crucial for cellular energy production, involving DNA polymerase gamma and accessory proteins.
  • Nucleotide precursors for mtDNA replication are supplied via salvage pathways or cytoplasmic reduction.
  • Defects in mtDNA replication or nucleotide metabolism lead to genetic disorders characterized by mtDNA instability.

Purpose of the Study:

  • To review current knowledge on genetic defects in mtDNA replication and nucleotide metabolism.
  • To highlight the link between these genetic defects and mitochondrial genetic diseases.
  • To discuss specific genes involved in mtDNA replication and nucleotide metabolism.

Main Methods:

  • Literature review of genetic defects in mtDNA replication and nucleotide metabolism.
  • Analysis of genetic causes for mitochondrial genetic diseases.
  • Focus on genes including POLG, POLG2, C10orf2, TYMP, TK2, DGOUK, and RRM2B.

Main Results:

  • Genetic defects in mtDNA replication (e.g., POLG) and nucleotide metabolism (e.g., TYMP) cause mtDNA instability.
  • This instability manifests as mtDNA deletions, point mutations, or depletion, impairing oxidative phosphorylation.
  • Specific genetic disorders reviewed include Alpers syndrome, PEO, and MNGIE.

Conclusions:

  • Genetic defects in key replication and nucleotide metabolism genes are primary causes of mitochondrial genetic diseases.
  • Understanding these genetic defects is crucial for diagnosing and potentially treating mitochondrial disorders.
  • Further research into these pathways can elucidate mechanisms of mtDNA instability.