title: A congenic line of the DDD mouse strain, DDD/1-Mtv-2/Mtv-2: establishment and mammary tumorigenesis.
abstract: A single dominant gene on chromosome 18, Mtv-2, controls both the early appearance of mammary tumors and expression of mouse mammary tumor virus (MMTV) in the milk. A congenic DDD mouse strain, DDD/1-Mtv-2/Mtv-2 (DDD-Mtv-2), was developed by introducing this gene from GRS/AJms (GR) into DDD/1 mice by repeating 12 backcrosses and subsequent inbreeding using mammary tumors as a marker for selection. Southern blot analysis of the liver DNA from the resulting congenic mice with EcoRI and MMTV-U3 prove revealed that two DNA fragments corresponding to Mtv-2 were specifically transferred from GR to congenic mice. Detection of MMTV-gp52 antigen in the mammary gland and mammary tumor development in DDDfDDD-Mtv-2 mice demonstrated the production of infectious mature MMTV by Mtv-2 in congenic mice. About 80% of breeding DDD-Mtv-2 females developed mammary tumors in the course of one-year follow-up. The tumor incidence was lower and the tumor age higher than those in GR mice, suggesting less active functioning of the gene on the DDD genetic background. About 70% of these tumors were morphologically classified as pale cell and type P carcinomas peculiar to GR mice. The gene seemed to control the histologic features of mammary tumors. Congenic mice carried an MMTV provirus in an incomplete form on Y chromosome. The DDD-Mtv-2-strain will provide a new model for biological and molecular researches into mouse mammary tumorigenesis.
authors.affiliation: Laboratory Animal Research Center, Institute of Medical Science, University of Tokyo.
authors.forename: A
authors.initials: A
authors.lastname: Matsuzawa
authors.forename: K
authors.initials: K
authors.lastname: Sayama
authors.forename: A
authors.initials: A
authors.lastname: Tsubura
authors.forename: A
authors.initials: A
authors.lastname: Murakami
mesh_terms: D000818:Animals; D015139:Blotting, Southern; D003433:Crosses, Genetic; D004247:DNA / Q000032:analysis; D005260:Female; D015870:Gene Expression; D008099:Liver / Q000032:analysis; D008297:Male; D008325:Mammary Neoplasms, Experimental / Q000235:genetics* / Q000473:pathology; D008324:Mammary Tumor Virus, Mouse / Q000235:genetics; D051379:Mice; D008815:Mice, Inbred Strains; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D004247:DNA