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Related Concept Videos

Nucleotide Excision Repair01:08

Nucleotide Excision Repair

Overview
Mutations01:39

Mutations

Overview
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...
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...
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).
Other Unique Bacteria01:18

Other Unique Bacteria

Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic and are commonly found near the...

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Related Experiment Video

Updated: Jun 26, 2026

mRNA Interactome Capture from Plant Protoplasts
12:29

mRNA Interactome Capture from Plant Protoplasts

Published on: July 28, 2017

Elevated UV-B radiation reduces genome stability in plants.

G Ries1, W Heller, H Puchta

  • 1Friedrich Miescher-Institut, Basel, Switzerland. ries@fmi.ch

Nature
|July 14, 2000
PubMed
Summary

Increased solar ultraviolet-B radiation, due to ozone depletion, elevates DNA damage in plants. This study reveals that UV-B exposure enhances DNA repair mechanisms, specifically homologous recombination, to maintain genome stability.

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03:20

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • Stratospheric ozone depletion leads to higher terrestrial solar ultraviolet-B (UV-B) radiation.
  • Elevated UV-B poses risks to living organisms, including DNA damage in plants.
  • Plants exhibit acclimation and adaptation responses to UV-B exposure.

Purpose of the Study:

  • To investigate the impact of elevated solar UV-B doses on DNA rearrangement frequencies in plants.
  • To explore the role of DNA repair pathways in response to UV-B-induced DNA damage.
  • To assess the potential effects of future UV-B increases on plant genome stability.

Main Methods:

  • Utilized specialized sun simulators to expose Arabidopsis and tobacco plants to elevated UV-B radiation.
  • Quantified the frequency of somatic homologous DNA rearrangements.
  • Analyzed gene expression of photolyase and Rad51, key DNA repair genes.
  • Compared recombination rates in wild-type and mutant Arabidopsis deficient in photorepair.

Main Results:

  • Elevated UV-B doses significantly increased the frequency of somatic homologous DNA rearrangements in plants.
  • Recombination increases were correlated with the induction of photolyase and Rad51 gene expression.
  • Mutant plants lacking effective photorepair showed substantially higher recombination under UV-B, indicating a role for recombination repair.

Conclusions:

  • Homologous recombination repair pathways are likely involved in mitigating UV-B-induced DNA lesions in plants.
  • Increased terrestrial solar UV-B radiation may compromise plant genome stability.
  • These findings highlight the sensitivity of plant genomes to environmental changes in UV radiation levels.