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  • Title: Functional interplay of Epstein-Barr virus oncoproteins in a mouse model of B cell lymphomagenesis.
    Author: Sommermann T, Yasuda T, Ronen J, Wirtz T, Weber T, Sack U, Caeser R, Zhang J, Li X, Chu VT, Jauch A, Unger K, Hodson DJ, Akalin A, Rajewsky K.
    Journal: Proc Natl Acad Sci U S A; 2020 Jun 23; 117(25):14421-14432. PubMed ID: 32522871.
    Abstract:
    Epstein-Barr virus (EBV) is a B cell transforming virus that causes B cell malignancies under conditions of immune suppression. EBV orchestrates B cell transformation through its latent membrane proteins (LMPs) and Epstein-Barr nuclear antigens (EBNAs). We here identify secondary mutations in mouse B cell lymphomas induced by LMP1, to predict and identify key functions of other EBV genes during transformation. We find aberrant activation of early B cell factor 1 (EBF1) to promote transformation of LMP1-expressing B cells by inhibiting their differentiation to plasma cells. EBV EBNA3A phenocopies EBF1 activities in LMP1-expressing B cells, promoting transformation while inhibiting differentiation. In cells expressing LMP1 together with LMP2A, EBNA3A only promotes lymphomagenesis when the EBNA2 target Myc is also overexpressed. Collectively, our data support a model where proproliferative activities of LMP1, LMP2A, and EBNA2 in combination with EBNA3A-mediated inhibition of terminal plasma cell differentiation critically control EBV-mediated B cell lymphomagenesis.
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