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Yuko Nakajima1, James E Haber1

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Broken chromosome ends in budding yeast move more to aid repair. This increased mobility is caused by DNA damage response, which affects the Cep3 protein and weakens centromere-spindle pole body connections.

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Area of Science:

  • Cellular biology
  • Molecular genetics
  • Biochemistry

Background:

  • Broken chromosome ends in budding yeast display heightened mobility, suggesting a mechanism to promote repair via recombination.
  • The precise molecular underpinnings of this increased chromosomal mobility remain incompletely understood.

Purpose of the Study:

  • To investigate the molecular mechanisms driving the increased mobility of broken chromosome ends in budding yeast.
  • To elucidate the role of the DNA damage response in regulating chromosome dynamics during repair.

Main Methods:

  • Utilized live-cell imaging techniques to track chromosome movement in budding yeast.
  • Employed genetic and biochemical approaches to analyze protein phosphorylation and protein-protein interactions.

Main Results:

  • Demonstrated that increased mobility of broken chromosome ends is a consequence of their untethering from the nuclear periphery.
  • Identified phosphorylation of the Cep3 kinetochore protein as a key event in the DNA damage response.
  • Showed that Cep3 phosphorylation weakens the association between the centromere and the spindle pole body, leading to chromosome untethering.

Conclusions:

  • The DNA damage response actively remodels the kinetochore-microtubule attachment complex to facilitate broken chromosome mobility.
  • This untethering mechanism is crucial for enabling efficient repair of DNA double-strand breaks by homologous recombination.