Abstract
In baby hamster kidney (BKH-21) cells abortively infected with adenovirus type 12, polysome-associated, virus-specific RNA could be detected starting 5 to 7 h after infection. The amount of this RNA reached a maximum between 10 to 12 h after infection and continued to be synthesized at a reduced level until late in infection (48 to 50 h.). In BHK-21 cells transformed by adenovirus type 12 (HB cells), 0.26% of the polysome-associated mRNA was virus specific. The size of the virus-specific mRNA isolated from polysomes of BHK-21 cells abortively infected with, or transformed by adenovirus type 12 was determined by electrophoresis in polyacrylamide gels in 98% formamide, i.e., under conditions which eliminated secondary structure or aggregation of RNA. In abortively infected hamster cells viral mRNA size classes of molecular weights 0.9 times 10-6 and 0.65 times 10-6 to 0.67 times 10-6 were predominant. A minor fraction of 1.5 times 10-6 daltons was consistently found and increased with time after infection. Late after infection (24 to 26 h), viral mRNA of 1.9 times 10-6 daltons was also observed. The size distribution of adenovirus type 12-specific mRNA from transformed hamster cells (HB line) was very similar to that in abortively infected cells, except that the relative amount of the viral mRNA fraction of 1.5 times 10-6 daltons was much higher. It is uncertain whether the viral mRNA of high-molecular-weight represents mixed transcripts derived from integrated viral genomes and adjacent host genes.
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