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Updated: Jun 22, 2025

Examination of Proteins Bound to Nascent DNA in Mammalian Cells Using BrdU-ChIP-Slot-Western Technique
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Nuclear F-actin assembly on damaged chromatin is regulated by DYRK1A and Spir1 phosphorylation

Junshi Li1,2, Nan Xiong1,2, Kirk L West3

  • 1School of Biomedical Sciences, LKS Faculty of Medicine, The University of Hong Kong, Hong Kong, S.A.R.

Nucleic Acids Research
|July 5, 2024
PubMed

Insights

The DYRK1A kinase promotes filamentous actin (F-actin) assembly at DNA double-strand breaks (DSBs) by targeting Spir1, which is crucial for DSB repair and genome stability.

Area of Science:

  • Molecular biology
  • Cell biology
  • Genetics

Background:

  • Nuclear actin dynamics are essential for DNA double-strand break (DSB) repair.
  • The molecular mechanisms regulating filamentous actin (F-actin) assembly at DSBs are not fully understood.

Purpose of the Study:

  • To identify molecular determinants that promote F-actin formation on damaged chromatin.
  • To elucidate the role of DYRK1A kinase in nuclear actin dynamics and DSB repair.

Main Methods:

  • Investigated the role of DYRK1A kinase in F-actin assembly at DSBs.
  • Examined the interaction between DYRK1A and actin nucleator Spir1.
  • Assessed the impact of DYRK1A-Spir1 axis perturbation on DSB repair and genome stability.

Main Results:

  • DYRK1A kinase promotes local F-actin assembly at DSBs, supporting DSB mobility and repair.
  • DYRK1A targets Spir1, regulating its accumulation at damaged chromatin.
  • Perturbation of DYRK1A-dependent Spir1 phosphorylation impairs actin polymerization and DNA repair.

Conclusions:

  • The DYRK1A-Spir1 axis is a key regulator of nuclear actin dynamics during early DSB responses.
  • Nuclear cytoskeletal networks play intricate roles in DSB repair and maintaining genome stability.

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