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A complete endogenous type C viral genome has been isolated from a baboon genomic library. The provirus,Papio cynocephalus endogenous retrovirus (PcEV), is 8,572 nucleotides long, and 38 to 59 proviral copies per baboon genome are found. The PcEV provirus possesses the typical simple retroviral gene organization, including two long terminal repeats and genes encoding gag, pol, and env proteins. The open reading frames forgag-pol andenv are complete but have premature stop codons or frameshift mutations. The primer binding site of PcEV is complementary to tRNAGly . Thegag andpol genes of PcEV are closely related to those of the baboon endogenous virus (BaEV). Theenv coding region of PcEV is related to theenv genes of type C retroviruses. This suggests that PcEV is one of the ancestors of BaEV contributing the type Cgag-pol genome fragment to the type C/D recombinant virus BaEV. Earlier it was shown that another endogenous type D virus (simian endogenous retrovirus) provided theenv gene for BaEV (A. C. van der Kuyl et al., J. Virol. 71:3666–3676, 1997).

Novel Endogenous Type C Retrovirus in Baboons: Complete Sequence, Providing Evidence for Baboon Endogenous Virus gag-pol Ancestry