Abstract
Cells losing the ability to self-regulate in response to damage are a hallmark of cancer. When a cell encounters damage, regulatory pathways estimate the severity of damage and promote repair, cell cycle arrest, or apoptosis. This decision-making process would be remarkable if it were based on the total amount of damage in the cell, but because damage detection pathways vary in the rate and intensity with which they promote pro-apoptotic factors, the cell’s real challenge is to reconcile dissimilar signals. Crosstalk between repair pathways, crosstalk between pro-apoptotic signaling kinases, and signals induced by damage by-products complicate the process further. The cell’s response to \(\gamma \) and UV radiation neatly illustrates this concept. While these forms of radiation produce lesions associated with two different pro-apoptotic signaling kinases, ATM and ATR, recent experiments show that ATM and ATR react to both forms of radiation. To simulate the pro-apoptotic signal induced by \(\gamma \) and UV radiation, we construct a mathematical model that includes three modes of crosstalk between ATM and ATR signaling pathways: positive feedback between ATM/ATR and repair proteins, ATM and ATR mutual upregulation, and changes in lesion topology induced by replication stress or repair. We calibrate the model to agree with 21 experimental claims about ATM and ATR crosstalk. We alter the model by adding or removing specific processes and then examine the effects of each process on ATM/ATR crosstalk by recording which claims the altered model violates. Not only is this the first mathematical model of ATM/ATR crosstalk, it provides a strong argument for treating pro-apoptotic signaling as a holistic effort rather than attributing it to a single dominant kinase.
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Code Availability
The code used in this paper is available on GitHub at https://github.com/lfedak/atmandatr.
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Funding
Elizabeth A. Fedak was supported by Research Training in Mathematical and Computational Biology Grant 1148230. Elizabeth A. Fedak and Frederick R. Adler were supported by NIH/NCI U54 Grant CA209978 to Andrea Bild. Joshua D. Schiffman and Lisa M. Abegglen are supported through the EP53 Program and its generous funding provided to Huntsman Cancer Institute by the State of Utah. Joshua D. Schiffman is also supported by Hyundai Hope on Wheels, 5 For The Fight, Kneaders Bakery & Café Hope Campaign, Soccer for Hope Foundation, and Li-Fraumeni Syndrome Association.
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EAF contributed to conceptualization, methodology, software, validation, formal analysis, writing—original draft, and writing—review and editing. FRA was involved in conceptualization, methodology, writing—review and editing, supervision, and funding acquisition. LMA and JDS contributed to writing—review and editing, and supervision.
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Lisa M. Abegglen is a consultant and a stock option holder of PEEL Therapeutics, Inc. Joshua D. Schiffman is employed by and a stock option holder of PEEL Therapeutics, Inc. Elizabeth A. Fedak and Frederick R. Adler declare that they have no conflict of interest.
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Fedak, E.A., Adler, F.R., Abegglen, L.M. et al. ATM and ATR Activation Through Crosstalk Between DNA Damage Response Pathways. Bull Math Biol 83, 38 (2021). https://doi.org/10.1007/s11538-021-00868-6
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DOI: https://doi.org/10.1007/s11538-021-00868-6