Ku 80-/- Cells

Ku80-/- MEF (Mouse Embryonic Fibroblast) cells are genetically engineered fibroblast cells derived from mice that lack the Ku80 gene (XRCC5). The Ku80 protein, in conjunction with Ku70, forms the Ku heterodimer, which is essential for the non-homologous end joining (NHEJ) pathway of DNA double-strand break (DSB) repair. The absence of Ku80 in these cells impairs their ability to effectively repair DSBs, making them a valuable model for studying the role of the NHEJ pathway in genomic stability, DNA repair mechanisms, and cancer biology.
Ku80-/- MEF cells exhibit increased sensitivity to ionizing radiation and other DNA-damaging agents due to their compromised DSB repair capacity. These cells also tend to accumulate chromosomal aberrations and exhibit genomic instability. The lack of Ku80 affects not only DNA repair but also other cellular processes such as V(D)J recombination, which is crucial for the development of a diverse repertoire of antibodies and T-cell receptors in the immune system.
Research using Ku80-/- MEF cells has provided significant insights into the molecular mechanisms of NHEJ and the broader implications of defective DNA repair. These studies are crucial for understanding the development of cancer and other diseases associated with genomic instability. Additionally, they help in the exploration of potential therapeutic targets for enhancing DNA repair in cancer cells, thereby improving the efficacy of cancer treatments that rely on inducing DNA damage in tumor cells.