Interaction between the product of the breast cancer susceptibility gene BRCA2 and DSS1, a protein functionally conserved from yeast to mammals.
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.
Marston
N J
NJ
Section of Gene Function and Regulation, Institute of Cancer Research, Chester Beatty Laboratories, London, United Kingdom SW3 6JB.
Richards
W J
WJ
Hughes
D
D
Bertwistle
D
D
Marshall
C J
CJ
Ashworth
A
A
D000595:Amino Acid Sequence; D000818:Animals; D024682:BRCA2 Protein; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism*; D019556:COS Cells; D018797:Cell Cycle Proteins; D003001:Cloning, Molecular; D017124:Conserved Sequence; D005260:Female; D005800:Genes, Fungal; D020022:Genetic Predisposition to Disease; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D011233:Precipitin Tests; D046988:Proteasome Endopeptidase Complex; D011506:Proteins / Q000235:genetics / Q000378:metabolism*; D011817:Rabbits; D051381:Rats; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D012568:Schizosaccharomyces / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D013696:Temperature; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014407:Tumor Cells, Cultured
D024682:BRCA2 Protein; D018797:Cell Cycle Proteins; D009363:Neoplasm Proteins; D011506:Proteins; D011993:Recombinant Fusion Proteins; C484606:SEM1 protein, human; C108199:Shfdg1 protein, mouse; D014157:Transcription Factors; D046988:Proteasome Endopeptidase Complex