title: Truncation of the c-myb gene by a retroviral integration in an interleukin 3-dependent myeloid leukemia cell line.
abstract: Among a series of myeloid leukemia cell lines, one (NFS-60) was found to have a rearrangement of the c-myb locus. The rearrangement involved the integration of a retrovirus into the region of the gene corresponding to the sixth exon of the avian c-myb locus. The insertion is associated with the production of a truncated RNA and the introduction of a terminator codon at the juncture of the long terminal repeat and the c-myb locus. The properties of the NSF-60 cells were compared with those of other myeloid cell lines, and the known sequence of differentiation induced by interleukin 3. Similar to other myeloid cell lines, the NFS-60 cells do not terminally differentiate in response to interleukin 3, granulocyte/macrophage, or granulocyte colony-stimulating factor suggesting that the cells are transformed with regard to their ability to differentiate. The NFS-60 cells are totally dependent on interleukin 3 for growth and maintenance of viability in vitro but also proliferate in response to granulocyte colony-stimulating factor. The properties of the cells support the concept that the c-myb protooncogene is involved in the control of normal differentiation of hematopoietic cells.
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D004273:DNA, Neoplasm / Q000032:analysis*; D004279:DNA, Viral / Q000032:analysis*; D007377:Interleukin-3; D009052:Leukemia Virus, Murine / Q000235:genetics*; D007942:Leukemia, Experimental / Q000235:genetics*; D007951:Leukemia, Myeloid / Q000235:genetics*; D008222:Lymphokines / Q000494:pharmacology; D051379:Mice; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D020598:Proto-Oncogene Proteins c-myb; D012333:RNA, Messenger / Q000032:analysis; D012334:RNA, Neoplasm / Q000032:analysis
chemical_list: D004273:DNA, Neoplasm; D004279:DNA, Viral; D007377:Interleukin-3; D008222:Lymphokines; D011518:Proto-Oncogene Proteins; D020598:Proto-Oncogene Proteins c-myb; D012333:RNA, Messenger; D012334:RNA, Neoplasm