Desmocollin 2 is a dominant entry receptor for Epstein–Barr virus infection of epithelial cells

Epstein-Barr virus (EBV) can infect B cells and epithelial cells, and cause lymphomas and various epithelial malignancies. During epithelial cell infection, EBV employs a complex combination of viral glycoproteins and host receptors. However, the exact mechanism and whether a dominant receptor exists remain unclear. Here we identify desmocollin 2 (DSC2) as a dominant EBV entry receptor for epithelial cell infection using CRISPR-Cas9 screening. Knockout of DSC2 reduced EBV infection in both nasopharyngeal and gastric epithelial cell lines, and infection was rescued when DSC2 expression was restored. Expression of human DSC2 in non-EBV-susceptible hamster cell lines enabled susceptibility to EBV. Furthermore, we found that DSC2 directly binds to EBV glycoprotein H/glycoprotein L through its extracellular domain, particularly the preEC-EC2 regions, which could be targeted by polyclonal antibodies, therefore blocking EBV infection in primary epithelial cells. DSC2 enabled virus entry independent of Ephrin receptor A2. These findings could aid development of currently unavailable animal models and support development of targeted therapies.