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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1995 Jan 31;92(3):890–894. doi: 10.1073/pnas.92.3.890

Complementation of the ionizing radiation sensitivity, DNA end binding, and V(D)J recombination defects of double-strand break repair mutants by the p86 Ku autoantigen.

N V Boubnov 1, K T Hall 1, Z Wills 1, S E Lee 1, D M He 1, D M Benjamin 1, C R Pulaski 1, H Band 1, W Reeves 1, E A Hendrickson 1, et al.
PMCID: PMC42726  PMID: 7846073

Abstract

Two ionizing radiation-sensitive (IRs) and DNA double-strand break (DSB) mutants, sxi-3 and sxi-2, were shown to be severely deficient in a DNA end binding activity, similar to a previously described activity of the Ku autoantigen, correlating with the xrs (XRCC5) mutations. Cell fusions with xrs-6, another IRs, DSB repair-deficient cell line, defined these sxi mutants in the XRCC5 group. sxi-3 cells have low expression levels of the p86Ku mRNA. Introduction of the Ku p86 gene, but not the p70 Ku gene, complemented the IRs, DNA end binding, and variable (diversity) joining [V(D)J] recombination signal and coding junction deficiencies of sxi-3. Thus, the p86 Ku gene product is essential for DSB repair and V(D)J recombination.

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Selected References

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