XRCC3 is a member of the RecA/Rad51-related protein family that participates in homologous recombination to maintain chromosome stability and repair DNA damage. XRCC3 plays a crucial role in DNA repair processes, specifically in maintaining chromosome stability during cell division. XRCC3 is essential for repairing DNA double-strand breaks through homologous recombination, a process that ensures genetic integrity and prevents genomic instability, which can lead to cancer and other diseases. XRCC3 interacts directly with Rad51, a key protein in homologous recombination repair pathway, facilitating accurate repair of damaged DNA. This interaction is vital for proper functioning of DNA repair machinery, as any defects in XRCC3 or associated proteins can compromise cellular ability to repair DNA, ultimately affecting cell survival and proliferation.