title: Dsi-1, a region with frequent proviral insertions in Moloney murine leukemia virus-induced rat thymomas.
abstract: Dsi-1 is a region of chromosomal DNA that underwent proviral insertion in 3 of 24 Moloney murine leukemia virus-induced rat thymomas. In one of these tumors, a provirus is also integrated adjacent to the proto-oncogene c-myc. The proviruses in Dsi-1 have been characterized and appear to be complete. The proviruses were located within a 2-kilobase region that contained four prominent DNase I-hypersensitive sites. These hypersensitive sites were observed in Moloney murine leukemia virus-induced thymomas but not in NRK cells. The region of Dsi-1 immediately 3' to the insertions cross-hybridized with human and chicken DNA, indicating that it contains highly conserved sequences. No evidence could be found for the expression of this highly conserved region. Dsi-1 was mapped to mouse chromosome 4. This location demonstrates that Dsi-1 is different from 16 of the known proto-oncogenes (c-abl, c-erbA c-erbB, c-ets-1, c-ets-2, c-fes, c-fos, c-myb, c-myc, c-raf, A-raf, c-Ha-ras, c-Ki-ras, N-ras, c-sis, and c-src) and 12 cellular regions of tumor-associated integrations in retrovirus-induced tumors (c-erbB, Fis-1, int-1, int-2, Mis-1/pvt-1, Mlvi-1, Mlvi-2, c-mos, c-myb, c-myc, Pim-1, and c-Ha-ras). Hybridization experiments indicated that Dsi-1 is probably different from five additional proto-oncogenes (c-fgr, c-fms, c-mos, neu, and c-yes) and from two additional frequent integration regions (lck and Mlvi-3).
mesh_terms: D000818:Animals; D002460:Cell Line; D004251:DNA Transposable Elements; D005814:Genes, Viral; D008979:Moloney murine leukemia virus / Q000235:genetics*; D000090063:Proto-Oncogene Mas; D011519:Proto-Oncogenes; D051381:Rats; D012689:Sequence Homology, Nucleic Acid; D013945:Thymoma / Q000235:genetics / Q000382:microbiology*; D013953:Thymus Neoplasms / Q000235:genetics / Q000382:microbiology*; D014158:Transcription, Genetic
chemical_list: D004251:DNA Transposable Elements; C000715470:MAS1 protein, human; D000090063:Proto-Oncogene Mas