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DAF-16/FOXO and EGL-27/GATA promote developmental growth in response to persistent somatic DNA damage

Michael M Mueller1,2, Laia Castells-Roca1,2, Vipin Babu1,2

  • 1Institute for Genome Stability in Ageing and Disease, Medical Faculty, University of Cologne, Joseph-Stelzmann-Str. 26, 50931 Cologne, Germany.

Nature Cell Biology
|November 25, 2014
PubMed

Insights

DNA damage responses are crucial for development and aging. This study reveals Forkhead box O (FOXO) transcription factor DAF-16

Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology
  • Aging Research

Background:

  • Genome maintenance defects lead to complex diseases, including developmental failure, cancer, and premature aging.
  • The precise mechanisms of DNA damage responses during development and aging remain incompletely understood.
  • Accumulating DNA damage with age poses challenges for maintaining tissue function.

Purpose of the Study:

  • To investigate the role of the FOXO transcription factor DAF-16 in DNA damage responses during development and aging.
  • To elucidate how DAF-16 functions in the context of DNA damage, particularly concerning developmental progression and tissue functionality.
  • To identify co-regulators of DAF-16 in DNA damage response pathways.

Main Methods:

  • Investigated the activation of DAF-16 in response to DNA damage during development.
  • Assessed the age-dependent changes in DAF-16 responsiveness to DNA damage.
  • Utilized genetic approaches to study the function of DAF-16 and EGL-27 in DNA damage response and development.
  • Analyzed the co-regulation of DAF-16 target genes by the GATA transcription factor EGL-27.

Main Results:

  • DAF-16 is activated by DNA damage during development, but its responsiveness declines with age.
  • DAF-16 mitigates DNA damage-induced developmental arrest and promotes growth and tissue function, independent of DNA repair.
  • The GATA transcription factor EGL-27 co-regulates DAF-16 target genes and collaborates with DAF-16 to promote developmental growth.

Conclusions:

  • DAF-16 plays a critical role in enabling developmental progression despite DNA damage.
  • EGL-27/GATA activity specifies DAF-16-mediated DNA damage responses.
  • This regulatory axis is essential for sustained tissue function in the presence of persistent DNA damage, particularly during aging.

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