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. 1979 Apr;30(1):84–89. doi: 10.1128/jvi.30.1.84-89.1979

Transcription of the Marek's Disease Virus Genome in Virus-Induced Tumors

Sandra Silver 1, Mary Smith 1, Meihan Nonoyama 1
PMCID: PMC353301  PMID: 225531

Abstract

Transcription of the Marek's disease virus (MDV) genome in tumor tissues from MDV-infected chickens has been studied by analyzing the hybridization kinetics of 3H-labeled MDV DNA with unlabeled RNA extracted from these tissues. Lymphoid tumors of ovary, spleen, liver, and kidney contained MDV genomes, but the virus-specific RNA sequences were transcribed from less than 15% of the viral DNA. A virus nonproductive lymphoblastoid cell line, designated MKT-1, has been established from a kidney lymphoma and contains 15 MDV genomes per cell. In these cells, 12 to 14% of the viral DNA was transcribed. Thus transcription of the MDV genome was restricted both in tumor tissues and MKT-1 cells. A hybridization experiment where RNA extracted from MKT-1 cells and RNA extracted from a spleen tumor were mixed and hybridized to 3H-labeled MDV DNA indicated that the virus-specific RNAs from the two sources were encoded by the same DNA sequences. The polyribosomal fractions of MKT-1 cells and this spleen tumor contained only a portion of the virus-specific RNA sequences found in whole-cell extracts, indicating the existence of a posttranscriptional control mechanism which prevents the transfer of certain viral RNA transcripts to the polyribosomes. The data suggest that the repressed expression of the viral genome in lymphoid tumor tissues and MKT-1 cells may be the result of precise controls within the cell at the transcriptional and posttranscriptional levels.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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