PMID- 1705320 OWN - NLM STAT- MEDLINE DCOM- 19910402 LR - 20071114 IS - 0890-6467 (Print) IS - 0890-6467 (Linking) VI - 6 IP - 1 DP - 1991 TI - Characterization of Int-5, a locus associated with early events in mammary carcinogenesis. PG - 53-63 AB - Three chemically-induced precancerous mammary hyperplasias, independently isolated in BALB/c mice, all contained mouse mammary tumor virus (MMTV) proviral DNA integrated into a common region in chromosomal DNA, designated Int-5 (Formerly Int-H, Gray et al., 1986). This site was cloned from a hyperplastic outgrowth (D2) into lambda phage. A 1.7 Kb Hind III DNA fragment, which flanks the 5' end of the MMTV insert, was generated from the cloned Int-5 region. This fragment was used as probe (IH-2) to localize Int-5 to mouse chromosome 9. The IH-2 sequence was highly conserved in DNA of several mammalian species including man, in three other widely divergent vertebrate phyla, and in C. elegans. The Int-5 region, containing 5.6 Kb 5' and 12.8 Kb 3' to the MMTV integration site in D2, was cloned in EMBL-3 from a BALB/c genomic DNA library. cDNA complementary to poly A+ lactating mammary gland RNA, annealed with Sst-1 fragments spanning most of the BALB/c Int-5 clone. The highest level of Int-5 specific poly A+ mRNA was detected in D2 tumor. Lactating mammary gland and D2 hyperplastic alveolar nodule contained 5-fold less Int-5 RNA while liver contained 8-fold less Int-5 RNA. Int-5 cDNA (IH-3) annealed with two RNA species of approximately 3.3 and 4.0 Kb. These data are consistent with the hypothesis that Int-5 contains an oncogene, different from any other previously described, involved in early events in some models of chemical carcinogenesis. FAU - Morris, V L AU - Morris VL AD - Department of Microbiology and Immunology, University of Western Ontario, London, Canada. FAU - Rao, T R AU - Rao TR FAU - Kozak, C A AU - Kozak CA FAU - Gray, D A AU - Gray DA FAU - Lee Chan, E C AU - Lee Chan EC FAU - Cornell, T J AU - Cornell TJ FAU - Taylor, C B AU - Taylor CB FAU - Jones, R F AU - Jones RF FAU - McGrath, C M AU - McGrath CM LA - eng GR - CA44901/CA/NCI NIH HHS/United States PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - Switzerland TA - Oncogene Res JT - Oncogene research JID - 8801457 RN - 0 (DNA Probes) RN - 63231-63-0 (RNA) RN - 9007-49-2 (DNA) SB - IM MH - Animals MH - Blotting, Northern MH - Blotting, Southern MH - Cell Transformation, Neoplastic/*genetics MH - Cloning, Molecular MH - DNA/analysis MH - DNA Probes MH - Mammary Neoplasms, Experimental/*genetics/microbiology MH - Mammary Tumor Virus, Mouse/genetics MH - Mice MH - Mice, Inbred BALB C MH - Nucleic Acid Hybridization MH - RNA/analysis MH - Restriction Mapping EDAT- 1991/01/01 00:00 MHDA- 1991/01/01 00:01 CRDT- 1991/01/01 00:00 PHST- 1991/01/01 00:00 [pubmed] PHST- 1991/01/01 00:01 [medline] PHST- 1991/01/01 00:00 [entrez] PST - ppublish SO - Oncogene Res. 1991;6(1):53-63.