ArticleNature communications2025
Polymerase theta repairs persistent G1-induced DNA breaks in S-phase during class switch recombination.
Article in Nature communications, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Optimizing microhomology-based genome editing by engineering DNA polymerase θ for improved efficiency and reduced on-target indels.Cell reports methods · 2026Article
- Direct Mapping of CDK2 Substrates in Embryonic Stem Cells Uncovers an AP-Site Repair Mechanism via HMCES Phosphorylation.bioRxiv : the preprint server for biology · 2026Article
- Recurrent DNA break clusters drive replication-stress-induced copy number variants and genome diversification.Nature communications · 2026Article
- Polymerase theta repairs persistent G1-induced DNA breaks in S-phase during class switch recombination.Nature communications · 2025Article
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Authors and funding
9 authors.
Funding
Abstract
Non-homologous end joining (NHEJ) is the primary pathway for repairing G1 phase-induced DNA double-strand breaks (DSBs) during immunoglobulin heavy chain (Igh) class switch recombination (CSR) in B lymphocytes. In B cells lacking NHEJ (XRCC4) or DSB end protection (SHLD1), end joining during CSR proceeds through an alternative end-joining pathway. Polymerase theta (Pol θ) is widely regarded as a mediator of this pathway, essential for repairing replication-associated DSBs during mitosis when homologous recombination is unavailable. In this study, we examined CSR in primary B cells lacking XRCC4, SHLD1, and/or Pol θ, revealing two repair pathways: Pol θ-independent productive switching and Pol θ-dependent unproductive switching characterized by end resection, inversion and microhomology. Furthermore, we show that Pol θ-mediated repair under NHEJ-deficiency coincides with G1-to-S phase transition and occurs independently of RHINO and PLK1. Thus, in the absence of NHEJ, Pol θ repairs persistent G1-phase DSBs during S-phase rather than mitosis.
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