WASp modulates RPA function on single-stranded DNA in response to replication stress and DNA damage.
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Embargo End Date
ICR Authors
Authors
Han, S-S
Wen, K-K
García-Rubio, ML
Wold, MS
Aguilera, A
Niedzwiedz, W
Vyas, YM
Wen, K-K
García-Rubio, ML
Wold, MS
Aguilera, A
Niedzwiedz, W
Vyas, YM
Document Type
Journal Article
Date
2022-06-29
Date Accepted
2022-06-08
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.
Citation
Nature Communications, 2022, 13 (1), pp. 3743 -
Source Title
Nature Communications
Publisher
NATURE PORTFOLIO
ISSN
2041-1723
eISSN
2041-1723
2041-1723
2041-1723
Collections
Research Team
Cancer and Genome Instab