WASp modulates RPA function on single-stranded DNA in response to replication stress and DNA damage

Seong-Su Han, Kuo-Kuang Wen, María L. García-Rubio, Marc S. Wold, Andrés Aguilera, Wojciech Niedzwiedz () and Yatin M. Vyas ()
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Seong-Su Han: PennState Health Children’s Hospital
Kuo-Kuang Wen: PennState Health Children’s Hospital
María L. García-Rubio: University of Seville-CSIC-University Pablo de Olavide
Marc S. Wold: University of Iowa Carver College of Medicine
Andrés Aguilera: University of Seville-CSIC-University Pablo de Olavide
Wojciech Niedzwiedz: The Institute of Cancer Research
Yatin M. Vyas: PennState Health Children’s Hospital

Nature Communications, 2022, vol. 13, issue 1, 1-15

Abstract: Abstract Perturbation in the replication-stress response (RSR) and DNA-damage response (DDR) causes genomic instability. Genomic instability occurs in Wiskott-Aldrich syndrome (WAS), a primary immunodeficiency disorder, yet the mechanism remains largely uncharacterized. Replication protein A (RPA), a single-strand DNA (ssDNA) binding protein, has key roles in the RSR and DDR. Here we show that human WAS-protein (WASp) modulates RPA functions at perturbed replication forks (RFs). Following genotoxic insult, WASp accumulates at RFs, associates with RPA, and promotes RPA:ssDNA complexation. WASp deficiency in human lymphocytes destabilizes RPA:ssDNA-complexes, impairs accumulation of RPA, ATR, ETAA1, and TOPBP1 at genotoxin-perturbed RFs, decreases CHK1 activation, and provokes global RF dysfunction. las17 (yeast WAS-homolog)-deficient S. cerevisiae also show decreased ScRPA accumulation at perturbed RFs, impaired DNA recombination, and increased frequency of DNA double-strand break (DSB)-induced single-strand annealing (SSA). Consequently, WASp (or Las17)-deficient cells show increased frequency of DSBs upon genotoxic insult. Our study reveals an evolutionarily conserved, essential role of WASp in the DNA stress-resolution pathway, such that WASp deficiency provokes RPA dysfunction-coupled genomic instability.

Date: 2022
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DOI: 10.1038/s41467-022-31415-z

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