eLife assessment
Based on largely indirect evidence, this study proposes that genomic integration of HIV targets DNA/RNA hybrids called R-loops. The evidence is indirect because the authors do not use relevant models systems to show integration and because they artificially induce R-loops in the critical experiments. There are two interrelated findings: 1) VSVg-pseudotyped HIV-1 induces R-loops in various cell types, and 2) VSVg-pseudotyped HIV-1 targets R-loops for integration in an artificial Hela cell model in which R-loops are exogenously induced. The induction of R-loops by a pseudotyped HIV-1 is a potentially valuable finding. Critically, however, because of the caveats above, the evidence is inadequate to support the primary claims in the title, abstract, and manuscript. Furthermore, if these claims were true, the authors do not provide context for how they could be reconciled with well-established structural data showing that HIV-1 integrase catalyzes the integration of viral DNA into dsDNA as a substrate.