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Complementary DNAs (cDNA's) specific for various regions of the Moloney murine sarcoma virus (MSV) 124 RNA genome were prepared by cross-hybridization techniques. A cDNA specific for the first 1,000 nucleotides adjacent to the RNA 3′ end (cDNA 3′) was prepared and shown to also be complementary to the 3′-terminal 1,000 nucleotides of a related Moloney murine leukemia virus (MLV) genome. A cDNA complementary to the “MSV-specific” portion of the MSV 124 genome was prepared. This cDNA was shown not to anneal to Moloney MLV RNA and to anneal to a portion of the viral RNA of about 1,500 to 1,800 nucleotides in length, located 1,000 nucleotides from the 3′ end of MSV RNA. A cDNA common to the genome of MSV and MLV was also obtained and shown to anneal to the 5′-terminal two-thirds, as well as to the 3′-terminal 1,000 nucleotides, of the MSV RNA genome. This cDNA also annealed to the RNA from MLV and mainly to the 5′-terminal half of the MLV genome. It is concluded that the 6-kilobase Moloney MSV 124 RNA genome has a sequence arrangement that includes (i) a 3′ portion of about 1,000 nucleotides, which is also present at the 3′ terminus of MLV; (ii) an MSV-specific region, not shared with MLV, which extends between 1,000 and 2,500 nucleotides from the 3′ terminus; and (iii) a second “common” region, again shared with MLV, which extends from 2,500 nucleotides to the 5′ terminus. This second common region appears to be located in the 5′ half of the 10-kilobase MLV genome as well. Experiments in which a large excess of cold MLV cDNA was annealed to3 H-labeled polyadenylic acid-containing fragments of MSV RNA gave results consistent with this arrangement of the MSV genome.

journal of virology

Relationship Between Moloney Murine Leukemia and Sarcoma Virus RNAs: Purification and Hybridization Map of Complementary DNAs from Defined Regions of Moloney Murine Sarcoma Virus 124