The Ku antigen is a DNA-associated nuclear protein originally recognized by the sera of patients with autoimmune diseases (1). It plays a key role in multiple nuclear processes, such as DNA repair, chromosome maintenance, transcription regulation, and V(D)J recombination (2). The Ku protein is composed of 70 and 82 kDa subunits (Ku70 and Ku80, respectively) and contributes to genomic integrity through its ability to bind DNA double-strand breaks and facilitate repair by the non-homologous end-joining pathway (3). When bound to DNA, the Ku 70/80 heterodimer enhances the kinase activity of the catalytic subunit of the DNA-dependent protein kinase, DNA-PKcs (4).
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