1. The DNA loop release factor WAPL suppresses Epstein-Barr virus latent membrane protein expression to maintain the highly restricted latency I program.
- Author
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Murray-Nerger LA, Maestri D, Liu X, Li Z, Auld NR, Tempera I, Teng M, and Gewurz BE
- Subjects
- Humans, B-Lymphocytes virology, B-Lymphocytes metabolism, Burkitt Lymphoma virology, Burkitt Lymphoma genetics, Burkitt Lymphoma metabolism, Cell Line, Tumor, Herpesvirus 4, Human genetics, Virus Latency physiology, Viral Matrix Proteins metabolism, Viral Matrix Proteins genetics, Gene Expression Regulation, Viral, Epstein-Barr Virus Infections virology, Epstein-Barr Virus Infections metabolism, Epstein-Barr Virus Infections genetics
- Abstract
Epstein-Barr virus (EBV) uses latency programs to colonize the memory B-cell reservoir, and each program is associated with human malignancies. However, knowledge remains incomplete of epigenetic mechanisms that maintain the highly restricted latency I program, present in memory and Burkitt lymphoma cells, in which EBNA1 is the only EBV-encoded protein expressed. Given increasing appreciation that higher order chromatin architecture is an important determinant of viral and host gene expression, we investigated roles of Wings Apart-Like Protein Homolog (WAPL), a host factor that unloads cohesin to control DNA loop size and that was discovered as an EBNA2-associated protein. WAPL knockout (KO) in Burkitt cells de-repressed LMP1 and LMP2A expression, but not other EBV oncogenes, to yield a viral program reminiscent of EBV latency II, which is rarely observed in B-cells. WAPL KO also increased LMP1/2A levels in latency III lymphoblastoid cells. WAPL KO altered EBV genome architecture, triggering formation of DNA loops between the LMP promoter region and the EBV origins of lytic replication (oriLyt). Hi-C analysis further demonstrated that WAPL KO reprogrammed EBV genomic DNA looping. LMP1 and LMP2A de-repression correlated with decreased histone repressive marks at their promoters. We propose that EBV coopts WAPL to negatively regulate latent membrane protein expression to maintain Burkitt latency I., Competing Interests: The authors have declared that no competing interests exist., (Copyright: © 2024 Murray-Nerger et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
- Published
- 2024
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