title: A new locus (Mtv-4) for endogenous mammary tumor virus expression and early mammary tumor development in the SHN mouse strain.
abstract: The SHN mouse strain, which has a high incidence of mammary cancer, developed by inbreeding and selection from Swiss stock mice by Dr. H. Nagasawa and co-workers (Meiji University, Tokyo, Japan), harbored an endogenous mammary tumor virus (MTV) responsible for a high frequency of mammary tumors early in life. The locus was called "Mtv-4" and was only comparable with Mtv-2 of the GR mouse strain in its inducing capacity of mammary cancer. Molecular hybridization with 32P-labeled MTV complementary DNA showed that the characteristic Mtv-2 bands of the GR strain were absent in the SHN strain.
mesh_terms: D000818:Animals; D003433:Crosses, Genetic; D004273:DNA, Neoplasm / Q000302:isolation & purification; D004279:DNA, Viral / Q000302:isolation & purification; D005260:Female; D005814:Genes, Viral; D008099:Liver / Q000032:analysis; D008297:Male; D008325:Mammary Neoplasms, Experimental / Q000235:genetics / Q000382:microbiology*; D008324:Mammary Tumor Virus, Mouse / Q000235:genetics*; D051379:Mice; D008807:Mice, Inbred BALB C; D008815:Mice, Inbred Strains; D008892:Milk / Q000382:microbiology; D011247:Pregnancy
chemical_list: D004273:DNA, Neoplasm; D004279:DNA, Viral