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Rous-associated virus 0 (RAV-0), an endogenous chicken virus, does not cause disease when inoculated into susceptible domestic chickens. An infectious unintegrated circular RAV-0 DNA was molecularly cloned, and the sequence of the long terminal repeat (LTR) and adjacent segments was determined. The sequence of the LTR was found to be very similar to that of replication-defective endogenous virus EV-1. Like the EV-1 LTR, the RAV-0 LTR is smaller (278 base pairs instead of 330) than the LTRs of the oncogenic members of the avian sarcoma virus-avian leukosis virus group. There is, however, significant homology. The most striking differences are in the U3 region of the LTR, and in this region there are a series of small segments present in the oncogenic viruses which are absent in RAV-0. These differences in the U3 region of the LTR could account for the differences in the oncogenic potential of RAV-0 and the avian leukosis viruses. I also compared the regions adjacent to the RAV-0 LTR with the available avian sarcoma virus sequences. A segment of approximately 200 bases to the right of the LTR (towardgag ) is almost identical in RAV-0 and the Prague C strain of Rous sarcoma virus. The segment of RAV-0 which lies between the end of theenv gene and U3 is approximately 190 bases in length. Essentially this entire segment is present betweenenv andsrc in the Schmidt-Ruppin A strain of Rous sarcoma virus. Most of this segment is also present betweenenv andsrc in Prague C; however, in Prague C there is an apparent deletion of 40 bases in the region adjacent toenv . In Schmidt-Ruppin A, but not in Prague C, about half of this segment is also present betweensrc and the LTR. This arrangement has implications for the mechanism by whichsrc was acquired. The region which encoded the gp37 portion ofenv appears to be very similar in RAV-0 and the Rous sarcoma viruses. However, differences at the very end ofenv imply that the carboxy termini of RAV-0, Schmidt-Ruppin A, and Prague C gp37s are significantly different. The implications of these observations are considered.

Sequence of the Long Terminal Repeat and Adjacent Segments of the Endogenous Avian Virus Rous-Associated Virus 0