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The technique of restriction site reconstruction was generalized so as to allow the subcloning of any DNA fragment and its subsequent reexcision with EcoRI, XbaI, XhoI or HindIII. After excision, the 3' terminus of each strand will be derived from the starting nucleic acid, permitting the use of such fragments as primers for nucleotide sequencing by primer extension methods. The technique was used to subclone a 56 base pair BstNI-DdeI fragment of Moloney murine sarcoma virus (Mo-MSV) as a unique HindIII-HindIII fragment. This fragment then served as a primer to sequence a portion of the RNA genome of Gazdar murine sarcoma virus (Gz-MSV). The nucleotide sequence which was obtained indicated that the transforming gene of Gz-MSV arose by at least two recombination events involving murine leukemia virus (MLV) and the cellular homologue c-mos. This analysis suggests that a virus indistinguishable from Mo-MSV was an intermediate in the formation of Gz-MSV.

nucleic acids research

A generalized method of subcloning DNA fragments by restriction site reconstruction: application to sequencing the amino-terminal coding region of the transforming gene of Gazdar marine sarcoma virus