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Nucleic Acids Research, 1980, Vol. 8, No. 15 3427-3437
© 1980

MOLECULAR BIOLOGY

The messenger RNA sequence in human fibrobtast cells induced with poly rI.rC to produce interferon

N.Babu Kishan Raj and Paula M. Pitha

The Johns Hopkins University School of Medicine, Oncology Center Baltimore, MD 21205, USA

Received May 7, 1980. Induction of human fibroblast cells with poly rI.rC induces interferon mRNA which can be translated into interferon precursor in wheat germ cell free system or in Xenopus oocytes into biologically active interferon.

The extent of gene expression in the poly rI.rC induced cells was compared to that of the uninduced cells by hybridization of the mRNA to complementary DNA.

Homologous template driven hybridization of cDNA revealed the presence of two clearly defined transitions in the total poly A RNA from the induced cells; abundant class and a scarce class comprising approximately 37,000 diverse species of RNA. Heterologous hybridization of the cDNA with total uninduced mRNA showed that the majority of the mRNA sequences are the same in both the induced and uninduced cells.

The results of the hybridization using cDNA prepared to the fraction enriched for interferon mRNA, however, showed that about 4% of the sequences present in the interferon enriched fraction are not present in the uninduced cells. These differences may result from the poly rI.rC induced alterations in gene expression.


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