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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...
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Related Experiment Video

Updated: Dec 21, 2025

Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair
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UV-B Response: When UVR8 Meets MYBs.

Yang Xu1, Ziqiang Zhu1

  • 1College of Life Sciences, Nanjing Normal University, Nanjing 210023, China.

Trends in Plant Science
|May 15, 2020
PubMed
Summary
This summary is machine-generated.

Plants utilize UV-B light for growth regulation. The UV-B receptor UVR8 interacts with MYB transcription factors in specific organs, controlling both cotyledon expansion and lateral root development.

Keywords:
MYB13MYB73MYB77UV-BUVR8

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Area of Science:

  • Plant biology
  • Photobiology
  • Molecular genetics

Background:

  • Plants perceive and respond to ultraviolet-B (UV-B) radiation.
  • The molecular mechanisms underlying organ-specific UV-B responses in plants are not fully understood.

Purpose of the Study:

  • To elucidate how UV-B light regulates plant growth and development in an organ-specific manner.
  • To identify key molecular players involved in UV-B mediated growth control.

Main Methods:

  • Investigated the interaction between the UV-B photoreceptor UV-8 (UVR8) and MYB transcription factors.
  • Utilized Arabidopsis thaliana as a model organism.
  • Examined organ-specific effects on cotyledon expansion and lateral root growth.

Main Results:

  • Demonstrated that UVR8 interacts with distinct MYB transcription factors in different plant organs.
  • Showed that these interactions differentially regulate physiological processes.
  • Specifically, UVR8-MYB interactions control cotyledon expansion in response to UV-B.
  • Also demonstrated control over lateral root growth mediated by UV-B signaling.

Conclusions:

  • UV-B light-induced growth regulation is mediated by organ-specific interactions of the UVR8 photoreceptor with MYB transcription factors.
  • This mechanism allows for differential control of plant development, such as cotyledon and root growth, in response to UV-B light.