Heteroduplex study of the sequence relations between RD-114 and baboon viral RNAs - PubMed (original) (raw)
Comparative Study
Heteroduplex study of the sequence relations between RD-114 and baboon viral RNAs
S Hu et al. J Virol. 1977 Aug.
Abstract
The regions of sequence homology and nonhomology between the RNA genomes of RD-114 and baboon endogenous type C viruses have been mapped by an electron microscope heteroduplex study. Short complementary DNA (cDNA) copies (approximately 150 to 200 nucleotides in length) of RD-114 RNA were prepared by an endogenous synthesis; labels of polydeoxythymidylic acid [poly(dT)] were attached to the 3' ends of the cDNA molecules by a reaction catalyzed by deoxynucleotidyl terminal transferase. The cDNA-poly(dT) was hybridized to RD-114 RNA and to baboon viral RNA dimer (50 to 70S) units, and the position- of the poly(dT) labels were observed by electron microscopy. With RD-114, labels were distributed uniformly along the genome. With baboon virus RNA (monomer length, 9.5 kilobases [kb]), the regions of high homology with RD-114 cDNA were observed to lie in the intervals from 1.5 to 2.5 kb and from 3.7 to 5.5 kb from the 5' end. The relations of these heteroduplex maps to the known antigenic similarities and differences among the several viral proteins and to the genetic maps of the viruses are discussed.
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