title: Characteristics and contributions of defective, ecotropic, and mink cell focus-inducing viruses involved in a retrovirus-induced immunodeficiency syndrome of mice.
abstract: LP-BM5 murine leukemia virus, a derivative of Duplan-Laterjet virus, contains a mixture of replication-competent B-tropic ecotropic and mink cell focus-inducing (MCF) viruses and a defective genome that is the proximal cause of a syndrome, murine AIDS (MAIDS), characterized by lymphoproliferation and immunodeficiency. The defective (BM5d) and ecotropic components of this mixture were molecularly cloned, and complete (BM5d) or partial (ecotropic) nucleotide sequences were determined. BM5d closely resembled the Du5H genome cloned from the Duplan virus, featuring a highly divergent p12 sequence in the gag open reading frame. In MAIDS-sensitive C57BL/6 mice, BM5d was detected in tissues within 2 weeks of infection but was absent from tissues of the MAIDS-resistant strain, A/J, 12 weeks after infection. B-cell-lineage tumors from mice with MAIDS contained and expressed BM5d, and clonal integrations of this genome were variably associated with clonal expansions of B cells in infected mice. Finally, mRNA crosshybridizing with a probe for BM5d was present in spleen but not kidney cells of uninfected B6 mice.
authors.affiliation: Laboratory of Immunopathology, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20892.
authors.forename: S K
authors.initials: SK
authors.lastname: Chattopadhyay
authors.forename: D N
authors.initials: DN
authors.lastname: Sengupta
authors.forename: T N
authors.initials: TN
authors.lastname: Fredrickson
authors.forename: H C
authors.initials: HC
authors.lastname: Morse
authors.forename: J W
authors.initials: JW
authors.lastname: Hartley
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015139:Blotting, Southern; D003001:Cloning, Molecular; D015342:DNA Probes; D004279:DNA, Viral / Q000737:chemistry*; D003673:Defective Viruses / Q000235:genetics*; D005814:Genes, Viral; D009052:Leukemia Virus, Murine / Q000235:genetics*; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D008908:Mink Cell Focus-Inducing Viruses / Q000235:genetics*; D008969:Molecular Sequence Data; D016183:Murine Acquired Immunodeficiency Syndrome / Q000382:microbiology*; D012091:Repetitive Sequences, Nucleic Acid; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D014407:Tumor Cells, Cultured
chemical_list: D015342:DNA Probes; D004279:DNA, Viral