title: Cellular sequences are present in the presumptive avian myeloblastosis virus genome.
abstract: EcoRI restriction endonuclease fragments from a lambda proviral DNA hybrid containing the entire presumptive avian myeloblastosis virus (AMV) provirus, and from a lambda proviral hybrid containing a partial myeloblastosis-associated virus type 1 (MAV-1)-like provirus were compared by heteroduplex analysis. The cloned presumptive AMV provirus was also analyzed by electron microscopy, using R-loop formation with purified 35S RNA isolated from virions of the standard AMV complex. The results indicate that the putative AMV genome contains a segment absent in its MAV-1-like helper virus. This segment represents a substitution in the region of the genome that in MAV-1 virus is occupied by the envelope gene and is approximately 900 +/- 160 nucleotide pairs in length. Hybridization of specific probes from the presumptive AMV genome to Southern blots of EcoRI-digested cellular DNA has revealed that these substituted sequences are homologous to chicken and duck DNA that is not related to chicken endogenous proviral sequences.
mesh_terms: D000818:Animals; D001354:Avian Leukosis Virus / Q000235:genetics*; D009189:Avian Myeloblastosis Virus / Q000235:genetics*; D010582:Bacteriophage lambda / Q000235:genetics; D001483:Base Sequence; D002642:Chick Embryo; D002645:Chickens / Q000235:genetics; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D004274:DNA, Recombinant; D004372:Ducks / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D005813:Genes, Synthetic; D005822:Genetic Vectors; D008854:Microscopy, Electron; D009693:Nucleic Acid Hybridization; D011995:Recombination, Genetic
chemical_list: D004274:DNA, Recombinant; D004247:DNA