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[Cancer Research 62, 4599-4604, August 15, 2002]
© 2002 American Association for Cancer Research

Carcinogenesis

CBFA2T3 (MTG16) Is a Putative Breast Tumor Suppressor Gene from the Breast Cancer Loss of Heterozygosity Region at 16q24.31

Marina Kochetkova2, Olivia L. D. McKenzie, Anthony J. Bais, Julie M. Martin, Genevieve A. Secker, Ram Seshadri, Jason A. Powell, Susan J. Hinze, Alison E. Gardner, Hayley E. Spendlove, Nathan J. O’Callaghan, Anne-Marie Cleton-Jansen, Cees Cornelisse, Scott A. Whitmore, Joanna Crawford, Gabriel Kremmidiotis, Grant R. Sutherland and David F. Callen

Department of Cytogenetics and Molecular Genetics, Women’s and Children’s Hospital, North Adelaide 5006, South Australia, Australia [M. K., O. L. D. M., A. J. B., J. M. M., J .A. P., A. E. G., H. E. S., N. J. O., G. R. S.]; Bionomics Ltd, Thebarton, South Australia, Australia [G. A. S., S. J. H., S. A. W., J. C., G. K., D. F. C.]; Department of Hematology/Genetic Pathology, Flinders Medical Centre, Flinders University, Bedford Park. South Australia, Australia [R. S.]; and Department of Pathology, Leiden University Medical Center, Leiden, the Netherlands [A-M. C-J, C. C.]

Numerous cytogenetic and molecular studies of breast cancer have identified frequent loss of heterozygosity (LOH) of the long arm of human chromosome 16. On the basis of these data, the likely locations of breast cancer tumor suppressor genes are bands 16q22.1 and 16q24.3. We have mapped the CBFA2T3 (MTG16) gene, previously cloned as a fusion partner of the AML1 protein from a rare (16;21) leukemia translocation, to the 16q24.3 breast cancer LOH region. The expression of CBFA2T3 was significantly reduced in a number of breast cancer cell lines and in primary breast tumors, including early ductal carcinomas in situ, when compared with nontransformed breast epithelial cell lines and normal breast tissue. Reintroduction of CBFA2T3 into different breast tumor derived cell lines with decreased expression of this gene reduced colony growth on plastic and in soft agar. CBFA2T3 was shown to function as a transcriptional repressor when tethered to the GAL4 DNA-binding domain in a reporter gene assay and, therefore, has the potential to be a transcriptional repressor in normal breast epithelial cells. Taken together, these findings suggest that CBFA2T3 is a likely candidate for the breast cancer tumor suppressor gene that is the target for the frequent 16q24 LOH in breast neoplasms.




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