E6a2 BCR-ABL fusion with BCR exon 5-deleted transcript in a Philadelphia positive CML responsive to Imatinib.
Chronic myeloid leukemia (CML) is characterized in 90% of patients by the presence of the reciprocal translocation t(9;22)(q34;q11) leading to the fusion of the BCR and ABL genes. Most patients with Philadelphia chromosome positive CML express either the e13a2 (b2a2) or e14a2 (b3a2) MBCR-ABL mRNA. Some variant cases have been reported expressing the fusion e1a2 (mBCR-ABL) or e19a2 (microBCR-ABL). Very rare atypical transcripts such as e13a3, e14a3 or e6a2 have been described. We report here a sixth case of a Ph positive patient with an e6a2 BCR-ABL fusion transcript and describe for the first time a chimeric molecule alternatively spliced for exon 5 of the BCR gene.
Popovici
Cornel
C
Laboratory of Molecular Oncology, UMR599 and Institut Paoli-Calmettes, Marseille Cancer Research Institute, Marseille, France.
Cailleres
Sylvie
S
David
Martine
M
Lafage-Pochitaloff
Marina
M
Sainty
Danielle
D
Mozziconacci
Marie-Joëlle
MJ
D000368:Aged; D001549:Benzamides; D005091:Exons; D016044:Fusion Proteins, bcr-abl / Q000378:metabolism*; D006801:Humans; D000068877:Imatinib Mesylate; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000188:drug therapy* / Q000235:genetics / Q000378:metabolism; D008297:Male; D010879:Piperazines / Q000627:therapeutic use*; D011743:Pyrimidines / Q000627:therapeutic use*
D001549:Benzamides; D010879:Piperazines; D011743:Pyrimidines; D000068877:Imatinib Mesylate; D016044:Fusion Proteins, bcr-abl