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APOBEC3B is a nuclear member of this family and is shown to be a positive regulator of HPV replication as well as expression. The proviral effects of A3B found in HPV positive cells contrast with its role as a restriction factor for many other viruses. Studies demonstrated that A3B can bind and regulate the formation of R-loops, which are trimeric nucleic acid structures consisting of an RNA paired with its complementary DNA strand, displacing one of the DNA strands. The present study demonstrates that A3B binds stably to both cellular and viral chromatin at sequences containing high R-loop levels, including the HPV URR and early polyadenylation sites. Importantly, A3B was found to play a critical role in the replication of HPV genomes and in regulating viral expression. Reduction of R-loop levels through overexpression of the R-loop specific RNase, RNase H1, impaired A3B binding to viral genomes as well as at multiple cellular sites. When A3B was depleted, total R-loop levels decreased by ~50%, leading to impaired viral transcription and an increase in the expression of immune genes, such as OASL, IL6, and IRF1. Mapping R-loop formation in A3B depleted cells revealed that A3B regulated a subset of R-loops that form on the transcriptional start (TSS) and termination sites (TTS) of cellular genes, including at the HPV URR. Furthermore, A3B depletion resulted in over a 50% reduction of DNA breaks along with altered expression of DNA damage repair proteins. This study demonstrates that A3B is an inducer of R-loop formation and DNA damage in HPV positive cells, thereby regulating cellular and viral gene expression along with HPV replication.<\/jats:p>","DOI":"10.1371\/journal.ppat.1014088","type":"journal-article","created":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T17:49:03Z","timestamp":1774288143000},"page":"e1014088","update-policy":"https:\/\/doi.org\/10.1371\/journal.ppat.corrections_policy","source":"Crossref","is-referenced-by-count":1,"title":["APOBEC3B regulates HPV replication by inducing R-loop formation and DNA damage"],"prefix":"10.1371","volume":"22","author":[{"given":"Conor W.","family":"Templeton","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jasmine S.","family":"Gulik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6314-623X","authenticated-orcid":true,"given":"Laimonis 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