Avian Tumor Virus RNA: a Comparison of Three Sarcoma Viruses and Their Transformation-defective Derivatives by Oligonucleotide Fingerprinting and DNA-RNA Hybridization

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1973 Aug 1

PMID 4365699

Citations 35

Authors

M M Lai

P H Duesberg

J Horst

P K Vogt

Affiliations

Soon will be listed here.

Abstract

Earlier electrophoretic analyses have shown that the 60-70S RNA of avian sarcoma viruses contains a characteristic subunit, termed class a subunit, which has a lower electrophoretic mobility than class b subunit found in transformation-defective derivatives of sarcoma viruses and in avian leukosis viruses. We have compared the RNAs of three nondefective avian sarcoma viruses, B77 and Prague and Schmidt-Ruppin strains of Rous sarcoma virus, with those of their transformation-defective (td) derivatives, td B77, td PR-C, and td SR-A, respectively, to determine the chemical basis for the difference between class a and b subunits. It was found by "fingerprinting" that (1) all (about 20-25) large T1 RNase-resistant oligonucleotides present in class b subunits of transformation-defective viruses have homologous counterparts in the class a subunits of corresponding nondefective sarcoma viruses and that (2) class a subunits contain a few (one or two) additional oligonucleotides that are not present in class b. By contrast the oligonucleotide fingerprints of avian tumor viruses of different strains and subgroups were very different.Cross hybridization of classes a and b RNA of sarcoma virus B77 with DNA transcribed from a corresponding transformation-defective virus td B77 showed that the two RNAs share at least 60% and differ by about 10% of their sequences. It is suggested that the structural relationship of class a and b subunits of corresponding viruses may be expressed as a = b + x, and that all the oligonucleotides present only in RNAs of sarcoma viruses but not in transformation-defective viruses of the corresponding strains are part of sequence(s) x. The possibility that x represents genetic information directly or indirectly involved in transformation of fibroblasts is discussed.

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