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Related Concept Videos

Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Mutations01:39

Mutations

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Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Nucleotide Excision Repair01:08

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Nucleotide Excision Repair01:08

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Visualizing and Quantifying Endonuclease-Based Site-Specific DNA Damage
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Non-randomized mtDNA damage after ionizing radiation via charge transport.

Xin Zhou1, Xinguo Liu, Xin Zhang

  • 1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.

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|October 31, 2012
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DNA damage in mitochondrial genomes is not uniform. Researchers found the control region is most susceptible to oxidative damage, with triple G sequences enriched in warm-blooded animals, suggesting a link to metabolism.

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Quantification of three DNA Lesions by Mass Spectrometry and Assessment of Their Levels in Tissues of Mice Exposed to Ambient Fine Particulate Matter

Published on: May 29, 2019

Area of Science:

  • Mitochondrial genomics
  • DNA damage and repair
  • Evolutionary biology

Background:

  • Mutation hotspots in mitochondrial DNA (mtDNA) are well-documented.
  • The existence and characteristics of DNA damage hotspots in mtDNA remain largely unexplored.

Purpose of the Study:

  • To investigate regional differences in mtDNA damage after ionizing radiation.
  • To identify specific DNA sequences or regions susceptible to damage.
  • To explore the evolutionary conservation of observed damage patterns.

Main Methods:

  • Real-time quantitative PCR was employed to assess regional DNA damage in the mitochondrial genome.
  • Analysis of 107 vertebrate mitochondrial genomes to evaluate evolutionary conservation of sequence features.
  • Correlation analysis between DNA damage patterns and animal thermoregulation (homeothermy vs. heterothermy).

Main Results:

  • mtDNA damage was found to be dose-dependent and unevenly distributed across the genome.
  • The control region exhibited the highest susceptibility to oxidative DNA damage.
  • A disproportionate enrichment of GGG sequences, acting as hole traps, was observed in the control region.
  • GGG enrichment in the control region was conserved in most homeothermal animals but not in heterothermic animals.

Conclusions:

  • The control region of mtDNA is a primary target for oxidative DNA damage.
  • GGG sequence enrichment in the mtDNA control region is linked to mitochondrial metabolism and is conserved in homeotherms.
  • These findings shed light on the interplay between DNA damage, sequence composition, and evolutionary adaptation in mitochondrial genomes.