CLONALITY, EXPRESSION AND METHYLATION PATTERNS OF THE EPSTEIN-BARR-VIRUS GENOMES IN LETHAL MIDLINE GRANULOMAS CLASSIFIED AS PERIPHERAL ANGIOCENTRIC T-CELL LYMPHOMAS
J. Minarovits et al., CLONALITY, EXPRESSION AND METHYLATION PATTERNS OF THE EPSTEIN-BARR-VIRUS GENOMES IN LETHAL MIDLINE GRANULOMAS CLASSIFIED AS PERIPHERAL ANGIOCENTRIC T-CELL LYMPHOMAS, Journal of General Virology, 75, 1994, pp. 77-84
We analysed the terminal repeats of Epstein-Barr virus (EBV) in DNAs i
solated from six lethal midline granuloma (LMG) biopsies. A single fus
ed terminal fragment could be detected in each case, indicating that t
hese angiocentric peripheral T cell lymphomas represent clonal prolife
rations of cells infected with EBV on a single occasion. Using reverse
transcriptase-PCR, we detected EBV nuclear antigen (EBNA) 1 and laten
t membrane protein (LMP) 1, but not EBNA 2 messages in LMG biopsy RNAs
. The splicing pattern of the EBNA 1 message was consistent with the u
sage of a promoter localized in the BamHI F fragment (F promoter). The
BamHI W fragment repeats and LMP-coding sequences were highly methyla
ted in ah cases. In contrast, the LMP regulatory sequences were found
to be hypomethylated or partially methylated, as in LMP-expressing nas
opharyngeal carcinomas.