Abstract:
:We have examined a t(9;11)(p22;q23) chromosome translocation in an acute myeloid leukemia of an infant. The breakpoints on the two chromosomes occurred within introns of the involved genes: AF-9 on chromosome 9, and ALL-1 on chromosome 11. Sequence analysis identified heptamers flanking the breakpoints on both chromosomes 9 and 11, suggesting that the V-D-J recombinase was involved in the translocation. The presence of an N-region between the two chromosomes supports the hypothesis that a mistake in V-D-J joining was involved in the genesis of the translocation and indicates that terminal deoxynucleotidyl transferase was expressed in the cells from which this acute myeloid leukemia originated. In addition, potential topoisomerase II DNA-binding sites were found near the breakpoints of both chromosomes, suggesting the involvement of altered topoisomerase II activity in this translocation. Altered topoisomerase II activity in the presence of an active V-D-J recombinase may be a pathogenetic mechanism of acute myeloid leukemia with rearrangements at 11q23.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Negrini M,Felix CA,Martin C,Lange BJ,Nakamura T,Canaani E,Croce CMsubject
Has Abstractpub_date
1993-10-01 00:00:00pages
4489-92issue
19eissn
0008-5472issn
1538-7445journal_volume
53pub_type
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