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J Virol. 1991 August; 65(8): 4284-4291

Diversity of hepatitis B virus X gene-related transcripts in hepatocellular carcinoma: a novel polyadenylation site on viral DNA.

C Hilger, I Velhagen, H Zentgraf and C H Schröder

Institut für Virusforschung/ATV, Deutsches Krebsforschungszentrum, Heidelberg, Germany.

ABSTRACT

RNA was isolated from tissue of two patients with hepatocellular carcinoma developed on the background of a chronic hepatitis B virus infection. For identification and characterization of 3' ends of X gene open reading frame (ORF)-related transcripts, RNA was reverse transcribed into cDNA and subjected to polymerase chain reaction. Cloned amplification products from tumor tissue of one patient represented an approximately even distribution of transcripts terminating at the established poly(A) signal (standard transcripts) and of truncated transcripts terminating at a CATAAA poly(A) signal within the 3' end region of X gene ORF (truncated transcripts). Amplified cDNA from tumor tissue of the second patient could be attributed mainly to the standard type of transcripts, whereas cDNA from the nontumor tissue of the same patient could be assigned to four groups of transcripts: (i) standard transcripts, (ii) transcripts with internal deletions affecting the 3' end of the X gene, (iii) truncated transcripts, and (iv) hybrid transcripts displaying 5' sequences from the X gene ORF fused to cellular sequences.

J Virol. 1991 August; 65(8): 4284-4291




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