When a
mutation, designated rad51M1, was generated in the mouse MmRAD51
gene,
mutant embryos died shortly after implantation. rad51M1 cells exhibited hypersensitivity to
ionizing radiation, reduced proliferation,
programmed cell death and
chromosome loss. The disruption of MmRad51
protein-
protein interactions stopped
cell proliferation and / or reduced
cell viability. Several proteins that interact with MmRad51 have been identified including, for example Brca2 and M96. Additionally, Rad51 self-associates via the N-terminal region. When a single residue was changed from a conserved
lysine to an
alanine, the alteration proved toxic to cells. Moreover, a rad51
allele that lacked the RecA homology region was also deleterious to cells. In view of the above, it is clear that inhibiting MmRad51 function or the function of any molecule that associates with MmRad51, or any molecule in the Rad51 or Rad52 pathways, hinders
cell proliferation and / or viability. Accordingly, molecules capable of blocking these critical
DNA repair pathways may be effective as therapeutics for inhibiting cell proliferation.