Abstract
A marker rescue assay of noninfectious fragments of avian leukosis virus DNAs is describe. DNA fragments were prepared either by sonication of EcoRI-digestion of DNAs of chicken cells infected with wild-type Rous sarcoma virus, with a nontransforming avian leukosis virus, and with a mutant of Rous sarcoma virus temperature sensitive for transformation. Recipient cultures of chicken embryo fibroblasts were treated with noninfectious DNA fragments and infected with temperature-sensitive mutants of Rous sarcoma virus defective in DNA polymerase or in an internal virion structural protein. Wild-type progeny viruses which replicated at the nonpermissive temperature were isolated. Some of the wild-type progeny acquired both the wild-type DNA polymerase and the subgroup specificity of the Rous sarcona virus strain used for preparation of sonicated or EcoRI-digested DNA fragments. Therefore the genetic markers for DNA polymerase and envelope were linked and appeared to be located on the same EcoRi fragment of the DNA of Rous sarcoma virus-infected cells.
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