Large deletions 5' to the ETO breakpoint are recurrent events in patients with t(8;21) acute myeloid leukemia.
Recurrent chromosomal rearrangements are observed in many leukemia subtypes. Recently, it has been shown that several of these translocations/inversions were associated with the loss of sequences located in the vicinity of the chromosomal breakpoints. So far, such deletions have not been described for the t(8;21) translocation. We have analyzed a series of 65 patients with t(8;21) using several probes specific for the ETO and AML1 regions. We have found six patients (9%) with deletion of the region 5' to ETO. In all six patients, the deletion encompassed at least 260 kb, and was even larger in two patients (up to 2 Mb). A similar analysis of the 21q22 region did not reveal any deletion of the 3'AML1 region. In conclusion, cytogenetically undetectable small deletions located immediately 5' to the ETO breakpoint were found to accompany the t(8;21) translocation in a significant percentage of cases. The clinical significance, if any, of these deletions remains to be determined.
Hematology Laboratory, University Hospital, Nantes, France.
C
C
Godon
J
J
Proffitt
N
N
Dastugue
M
M
Lafage-Pochitaloff
M-J
MJ
Mozziconacci
P
P
Talmant
M
M
Hackbarth
R
R
Bataille
H
H
Avet-Loiseau
D000208:Acute Disease; D000328:Adult; D000368:Aged; D002869:Chromosome Aberrations; D002891:Chromosomes, Human, Pair 21 / Q000235:genetics*; D002898:Chromosomes, Human, Pair 8 / Q000235:genetics*; D050676:Core Binding Factor Alpha 2 Subunit; D005260:Female; D017353:Gene Deletion; D006801:Humans; D007621:Karyotyping; D007951:Leukemia, Myeloid / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000235:genetics*; D015514:Oncogene Proteins, Fusion / Q000235:genetics*; D000075142:RUNX1 Translocation Partner 1 Protein; D014157:Transcription Factors / Q000235:genetics*; D014178:Translocation, Genetic / Q000235:genetics
C107844:AML1-ETO fusion protein, human; D050676:Core Binding Factor Alpha 2 Subunit; D015514:Oncogene Proteins, Fusion; D000075142:RUNX1 Translocation Partner 1 Protein; D014157:Transcription Factors