| Virus Name | Human Papillomavirus 31 |
| Virus Short Name | HPV31 |
| Order | Unassigned |
| Virus Family | Papillomaviridae |
| Virus Subfamily | N.A. |
| Genus | Alphapapillomavirus |
| Species | Human papillomavirus 16 |
| Host | Human, monkeys |
| Cell Tropism | Epithelial cells of skin, mucous membranes |
| Associated Disease | Malignant tumours |
| Mode of Transmission | Sexual, indirect and direct contact, auto-inoculation |
| VIPR DB link | N.A. |
| ICTV DB link | https://talk.ictvonline.org/ictv-reports/ictv_9th_report/dsdna-viruses-2011/w/dsdna_viruses/121/papillomaviridae |
| Virus Host DB link | http://www.genome.jp/virushostdb/view/?virus_lineage=Papillomaviridae |
| Paper Title | Homologous Recombination Repair Factors Rad51 and BRCA1 Are Necessary for ProductiveReplication of Human Papillomavirus 31 |
| Author's Name | William H. Chappell, Dipendra Gautam, Suzan T. Ok, Bryan A. Johnson, Daniel C. Anacker, Cary A. Moody |
| Journal Name | Journal Of Virology |
| Pubmed ID | 26699641 |
| Abstract | High-risk human papillomavirus 31 (HPV31)-positive cells exhibit constitutive activation of the ATM-dependent DNA damage response (DDR), which is necessary for productive viral replication. In response to DNA double-strand breaks (DSBs), ATM activation leads to DNA repair through homologous recombination (HR), which requires the principal recombinase protein Rad51, as well as BRCA1. Previous studies from our lab demonstrated that Rad51 and BRCA1 are expressed at high levels in HPV31-positive cells and localize to sites of viral replication. These results suggest that HPV may utilize ATM activity to increase HR activity as a means to facilitate viral replication. In this study, we demonstrate that high-risk HPV E7 expression alone is sufficient for the increase in Rad51 and BRCA1 protein levels. We have found that this increase occurs, at least in part, at the level of transcription. Studies analyzing protein stability indicate that HPV may also protect Rad51 and BRCA1 from turnover, contributing to the overall increase in cellular levels. We also demonstrate that Rad51 is bound to HPV31 genomes, with binding increasing per viral genome upon productive replication. We have found that depletion of Rad51 and BRCA1, as well as inhibition of Rad51s recombinase activity, abrogates productive viral replication upon differentiation. Overall, these results indicate that Rad51 and BRCA1 are required for the process of HPV31 genome amplification and suggest that productive replication occurs in a manner dependent upon recombination. |
| Used Model | CIN612 9E, HFK-31, HFK31-E6, HFK31-E7, HFK31-E6E7, and HFK31/DR-GFP |
| DOI | 10.1128/JVI.02495-15 |
