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J Virol. 1978 October; 28(1): 352-360

Heteroduplex analysis of the sequence relations between the RNAs of mink cell focus-inducing and murine leukemia viruses.

ABSTRACT

The sequence relationships betwen AKR ecotropic virus and an AKR-derived "mink cell focus-inducing" (MCF) isolate (AKR MCF 247), between Moloney murine leukemia virus (M-MLV) and an M-MLV MCF isolate (M-MLV83), and between AKR and M-MLV were studied by electron microscopic heteroduplex analysis. The MCF-specific sequences were found to map from 1.95 kilobases (kb) to 2.75 kb (+/- 0.15 kb) from the 3' end of the RNAs for both MCF isolates. The major sequence nonhomology regions between AKR and M-MLV lie between 0.9 and 3.5 kb from the 3' end. However, the AKR and M-MLV sequences immediately adjacent to the 1.95- and 2.75-kb junctions with MCF-specific sequences are relatively similar in AKR and M-MLV. Our results suggest that the env gene of MLVs maps from 1 kb to 3 kb from the 3' end of the genomic RNA and that the carboxyl end of the glycoprotein of each MCF strain is similar (or identical) to that of its ecotropic parent.

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