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Molecular and Cellular Biology, July 1999, p. 4633-4642, Vol. 19, No. 7
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Interaction between the Product of the Breast Cancer Susceptibility Gene BRCA2 and DSS1, a Protein Functionally Conserved from Yeast to Mammals

Nicola J. Marston,1 William J. Richards,2 David Hughes,2 David Bertwistle,1 Christopher J. Marshall,2 and Alan Ashworth1,*

Section of Gene Function and Regulation1 and CRC Centre for Cell and Molecular Biology,2 Institute of Cancer Research, Chester Beatty Laboratories, London, United Kingdom SW3 6JB

Received 26 March 1999/Accepted 5 April 1999

Germ line mutations in the breast cancer susceptibility gene BRCA2 predispose to early-onset breast cancer, but the function of the nuclear protein encoded by the gene is ill defined. Using the yeast two-hybrid system with fragments of human BRCA2, we identified an interaction with the human DSS1 (deleted in split hand/split foot) gene. Yeast and mammalian two-hybrid assays showed that DSS1 can associate with BRCA2 in the region of amino acids 2472 to 2957 in the C terminus of the protein. Using coimmunoprecipitation of epitope-tagged BRCA2 and DSS1 cDNA constructs transiently expressed in COS cells, we were able to demonstrate an association. Furthermore, endogenous BRCA2 could be coimmunoprecipitated with endogenous DSS1 in MCF7 cells, demonstrating an in vivo association. Apparent orthologues of the mammalian DSS1 gene were identified in the genome of the yeasts Schizosaccharomyces pombe and Saccharomyces cerevisiae. Yeast strains in which these DSS1-like genes were deleted showed a temperature-sensitive growth phenotype, which was analyzed by flow cytometry. This provides evidence for a link between the BRCA2 tumor suppressor gene and a gene required for completion of the cell cycle.

* Corresponding author. Mailing address: Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Rd., London, United Kingdom SW3 6JB. Phone: (44)-171-352-8133. Fax: (44)-171-352-3299. E-mail: alana{at}icr.ac.uk.

Molecular and Cellular Biology, July 1999, p. 4633-4642, Vol. 19, No. 7
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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