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Modelling the checkpoint response to telomere uncapping in budding yeast

Lookup NU author(s): Dr Carole Proctor, Professor David Lydall, Professor Richard Boys, Dr Colin Gillespie, Dr Daryl Shanley, Professor Darren Wilkinson, Emeritus Professor Thomas Kirkwood

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Abstract

One of the DNA damage-response mechanisms in budding yeast is temporary cell-cycle arrest while DNA repair takes place. The DNA damage response requires the coordinated interaction between DNA repair and checkpoint pathways. Telomeres of budding yeast are capped by the Cdc13 complex. In the temperature-sensitive cdc13-1 strain, telomeres are unprotected over a specific temperature range leading to activation of the DNA damage response and subsequently cell-cycle arrest. Inactivation of cdc13-1 results in the generation of long regions of single-stranded DNA (ssDNA) and is affected by the activity of various checkpoint proteins and nucleases. This paper describes a mathematical model of how uncapped telomeres in budding yeast initiate the checkpoint pathway leading to cell-cycle arrest. The model was encoded in the Systems Biology Markup Language (SBML) and simulated using the stochastic simulation system Biology of Ageing e-Science Integration and Simulation (BASIS). Each simulation follows the time course of one mother cell keeping track of the number of cell divisions, the level of activity of each of the checkpoint proteins, the activity of nucleases and the amount of ssDNA generated. The model can be used to carry out a variety of in silico experiments in which different genes are knocked out and the results of simulation are compared to experimental data. Possible extensions to the model are also discussed. © 2006 The Royal Society.


Publication metadata

Author(s): Proctor CJ, Lydall D, Boys RJ, Gillespie CS, Shanley D, Wilkinson DJ, Kirkwood TBL

Publication type: Article

Publication status: Published

Journal: Journal of the Royal Society Interface

Year: 2007

Volume: 4

Issue: 12

Pages: 73-90

Date deposited: 18/08/2010

ISSN (print): 1742-5689

ISSN (electronic): 1742-5662

Publisher: The Royal Society Publishing

URL: http://dx.doi.org/10.1098/rsif.2006.0148

DOI: 10.1098/rsif.2006.0148

PubMed id: 17015293


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