Seven loci of endogenous proviruses were detected in the genome of Brown Leghorn chickens. Sets of endogenous proviruses in DNA of the chicken embryos examined were identified by blot hybridization with 32P-labelled DNA of RSV and EcoRI restriction endonuclease digestion. Comparison of the results showed that only one locus (A) of endogeneous provirus was associated with a gs+ phenotype as determined by the immunoperoxidase reaction and antibodies against gag gene products of RSV. Restriction endonuclease analysis with HindIII, BamHI and SacI revealed that proviruses A and F in Brown Leghorn chickens correspond to loci ev-3 and ev-6, respectively, in White Leghorn chickens. Other loci (B, C, D, E, and X) were designated ev-22, ev-23, ev-24, ev-25, ev-26, respectively. None of these loci expressed infectious virions. The structure of most of the endogenous proviruses examined is considerably different from the genome of the endogenous chicken virus RAV-O. The difference in structure may be one possible cause of the absence of endogenous provirus expression.
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