1887

Abstract

SUMMARY

Infectious virus nucleic acids were extracted from the Hirt supernatant of chicken embryo fibroblasts infected for different times with the Schmidt-Ruppin strain of Rous sarcoma virus (RSV). Infectious DNA and DNA-RNA hybrid molecules could be recovered from 6 h after infection in experiments using 1.5 × 10 infected cells. Only small amounts of infectious virus DNA could be purified 6 h after infection whereas at 24 h approximately one infectious DNA molecule could be recovered for each input virus infectious unit. At 24 h, both infectious supercoiled and non-supercoiled molecules were found. The specific infectivity of the supercoiled fraction was less than that of the non-supercoiled fraction. Infectious supercoiled DNA could be recovered from 16 h after infection. Evidence is presented that both forms of unintegrated virus DNA may rest unintegrated for at least 8 days in the cell, though chronically infected cells were shown to contain less than one unintegrated molecule per 10 to 10 cells.

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1979-01-01
2022-08-18
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