Mitotic regulators TPX2 and Aurora A protect DNA forks during replication stress by counteracting 53BP1 function

Andrea K. Byrum, Denisse Carvajal-Maldonado, Miranda C. Mudge, David Valle-Garcia, Mona C. Majid, Romil Patel, Mathew E. Sowa, Steven P. Gygi, J. Wade Harper, Yang Shi, Alessandro Vindigni, Nima Mosammaparast

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

53BP1 is a chromatin-associated protein that regulates the DNA damage response. In this study, we identify the TPX2/Aurora A heterodimer, nominally considered a mitotic kinase complex, as a novel binding partner of 53BP1. We fnd that TPX2/Aurora A plays a previously unrecognized role in DNA damage repair and replication fork stability by counteracting 53BP1 function. Loss of TPX2 or Aurora A compromises DNA end resection, BRCA1 and Rad51 recruitment, and homologous recombination. Furthermore, loss of TPX2 or Aurora A causes deprotection of stalled replication forks upon replication stress induction. Tis fork protection pathway counteracts MRE11 nuclease activity but functions in parallel to BRCA1. Strikingly, concurrent loss of 53BP1 rescues not only BRCA1/Rad51 recruitment but also the fork instability induced upon TPX2 loss. Our work suggests the presence of a feedback mechanism by which 53BP1 is regulated by a novel binding partner and uncovers a unique role for 53BP1 in replication fork stability.

Original languageEnglish
Pages (from-to)422-432
Number of pages11
JournalJournal of Cell Biology
Volume218
Issue number2
DOIs
StatePublished - Feb 1 2019

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    Byrum, A. K., Carvajal-Maldonado, D., Mudge, M. C., Valle-Garcia, D., Majid, M. C., Patel, R., Sowa, M. E., Gygi, S. P., Wade Harper, J., Shi, Y., Vindigni, A., & Mosammaparast, N. (2019). Mitotic regulators TPX2 and Aurora A protect DNA forks during replication stress by counteracting 53BP1 function. Journal of Cell Biology, 218(2), 422-432. https://doi.org/10.1083/jcb.201803003