کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5674851 | 1594205 | 2017 | 11 صفحه PDF | دانلود رایگان |
- The EBV miR-BHRF1 microRNAs do not up upregulate B cell growth in trans.
- EBNA-LP expression is downregulated by pri-miR-BHRF1-2 and 1-3 acting in cis.
- Loss of miR-BHRF1-2 and 1-3 causes EBNA-LP overexpression and inhibits B cell growth.
- Novel alternative splicing of EBV Cp/Wp transcripts was identified.
The Epstein-Barr virus (EBV) miR-BHRF1 microRNA (miRNA) cluster has been shown to facilitate B-cell transformation and promote the rapid growth of the resultant lymphoblastoid cell lines (LCLs). However, we find that expression of physiological levels of the miR-BHRF1 miRNAs in LCLs transformed with a miR-BHRF1 null mutant (â123) fails to increase their growth rate. We demonstrate that the pri-miR-BHRF1-2 and 1-3 stem-loops are present in the 3'UTR of transcripts encoding EBNA-LP and that excision of pre-miR-BHRF1-2 and 1-3 by Drosha destabilizes these mRNAs and reduces expression of the encoded protein. Therefore, mutational inactivation of pri-miR-BHRF1-2 and 1-3 in the â123 mutant upregulates the expression of not only EBNA-LP but also EBNA-LP-regulated mRNAs and proteins, including LMP1. We hypothesize that this overexpression causes the reduced transformation capacity of the â123 EBV mutant. Thus, in addition to regulating cellular mRNAs in trans, miR-BHRF1-2 and 1-3 also regulate EBNA-LP mRNA expression in cis.
Journal: Virology - Volume 512, December 2017, Pages 113-123