title: Unusual long target duplication by insertion of intracisternal A-particle element in radiation-induced acute myeloid leukemia cells in mouse.
abstract: Retrotransmission into the IL-3/GM-CSF gene locus by the retrotransposon intracisternal A-particle (IAP) had been observed in distinct tumor cell lines. We analyzed the locus in genomes from 7 different myeloid leukemia cell strains which were originally generated by whole-body X-irradiation of the inbred C3H/He mice at a dose of 3 Gy and maintained by in vivo passage. In one leukemia cell strain out of 7 such cases, RFLP of an allele of the interleukin-3 gene was found. Sequence analysis after cloning from the genomic library showed that a type I delta 2 IAP element was inserted in the region upstream of the IL-3 gene in the head-to-head orientation. This suggests that the locus in myeloid cells is sensitive for integration of IAP elements. Additionally, an unusual long target duplication of 82 bp, 14-fold larger than normal one, was found at the junction of the element. This suggests the possibility of a radiation-induced integration mechanism which is distinct from normal retrotransmission.
mesh_terms: D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D017931:DNA Primers / Q000737:chemistry; D004273:DNA, Neoplasm / Q000235:genetics*; D005260:Female; D015321:Gene Rearrangement; D007426:Genes, Intracisternal A-Particle / Q000235:genetics*; D007377:Interleukin-3 / Q000235:genetics; D007942:Leukemia, Experimental / Q000235:genetics*; D015470:Leukemia, Myeloid, Acute / Q000235:genetics*; D007953:Leukemia, Radiation-Induced / Q000235:genetics*; D008297:Male; D051379:Mice; D008809:Mice, Inbred C3H; D008969:Molecular Sequence Data; D012091:Repetitive Sequences, Nucleic Acid; D015183:Restriction Mapping; D018626:Retroelements / Q000235:genetics*; D016662:Virus Integration; D014965:X-Rays
chemical_list: D017931:DNA Primers; D004273:DNA, Neoplasm; D007377:Interleukin-3; D018626:Retroelements