Insertional activation of N-myc by endogenous Moloney-like murine retrovirus sequences in macrophage cell lines derived from myeloma cell line-macrophage hybrids.
Hybrids formed from a myeloma cell line, NS1, and macrophages initially show myeloma properties but later, after loss of the parental macrophage genome and consequent loss of myeloma characteristics, express macrophage properties. Molecular studies demonstrated that macrophage properties in the hybridomas originate from the NS1 parental cells (M. Setoguchi, S. Yoshida, Y. Higuchi, S. Akizuki, and S. Yamamoto, Somatic Cell Mol. Genet. 14:427-438, 1988). In such hybrids, N-myc was activated by insertion of endogenous Moloney-like retrovirus sequences into mouse N-myc exon 3 when the hybrids gained macrophage properties. Interestingly, expression of N-myc took place in all aged hybrids. These results suggest that such unique insertional mutagenesis occurs in a regionally specific manner and that expression of N-myc may play a role in hematopoietic lineage conversion.
Setoguchi
M
M
Department of Pathology, Medical College of Oita, Japan.
Higuchi
Y
Y
Yoshida
S
S
Nasu
N
N
Miyazaki
Y
Y
Akizuki
S
S
Yamamoto
S
S
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D004251:DNA Transposable Elements / Q000235:genetics*; D015698:Genomic Library; D006822:Hybrid Cells; D008264:Macrophages / Q000502:physiology*; D051379:Mice; D008969:Molecular Sequence Data; D008979:Moloney murine leukemia virus / Q000235:genetics*; D009101:Multiple Myeloma; D009857:Oncogenes; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D016271:Proto-Oncogene Proteins c-myc; D012091:Repetitive Sequences, Nucleic Acid
D004251:DNA Transposable Elements; D011518:Proto-Oncogene Proteins; D016271:Proto-Oncogene Proteins c-myc