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Blood, 1 May 2008, Vol. 111, No. 9, pp. 4788-4796.
Prepublished online as a Blood First Edition Paper on February 5, 2008; DOI 10.1182/blood-2007-07-101394.
Previous Article | Next Article 
Submitted July 30, 2007
Accepted January 27, 2008
High-throughput sequence analysis of the tyrosine kinome in acute myeloid leukemia
Marc M Loriaux, Ross L Levine, Jeffrey W Tyner, Stefan Frohling, Claudia Scholl, Eric P Stoffregen, Gerlinde Wernig, Heidi Erickson, Christopher A Eide, Roland Berger, Olivier A. Bernard, James D. Griffin, Richard M Stone, Benjamin Lee, Matthew Meyerson, Michael C Heinrich, Michael W Deininger, D Gary Gilliland, and Brian J Druker*
Division of Hematology and Medical Oncology, Oregon Health and Science University Cancer Institute, Portland, OR, United States
Brigham and Women's Hospital, Howard Hughes Medical Institute, Harvard Medical School, Boston, MA, United States
INSERM, IRNEM, Hopital Necker, Paris, France
Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, United States
Broad Institute of Harvard and MIT, Boston, MA, United States
Portland VA Medical Center, Portland, OR, United States
Howard Hughes Medical Institute, Boston, MA, United States
Howard Hughes Medical Institute, Portland, OR, United States
* Corresponding author; email: drukerb{at}ohsu.edu.
To determine whether aberrantly activated tyrosine kinases other than FLT3 and c-KIT contribute to acute myeloid leukemia (AML) pathogenesis, we employed high throughput (HT) DNA sequence analysis to screen exons encoding the activation loop and juxtamembrane domains of 85 tyrosine kinase genes in 192 AML patients without FLT3 or c-KIT mutations. The screen identified 30 non-synonymous sequence variations in 22 different kinases not previously reported in single-nucleotide polymorphism databases. These included a novel FLT3 activating allele and a previously described activating mutation in MET (METT1010I). The majority of the novel sequence variants were stably expressed in factor-dependent Ba/F3 cells. Apart from one FLT3 allele, none of the novel variants showed constitutive phosphorylation by immunoblot analysis and none transformed Ba/F3 cells to factor-independent growth. These findings indicate the majority of these alleles are not potent tyrosine kinase activators in this cellular context and that a significant proportion of non-synonymous sequence variants identified in HT DNA sequencing screens may not have functional significance. Though some sequence variants may represent SNPs, these data are consistent with recent reports that a significant fraction of such sequence variants are "passenger" rather than "driver" alleles and underscore the importance of functional assessment of candidate disease alleles.

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