Abstract
We have shown that Werner syndrome (WRN) fibroblast cell lines are unusually sensitive to the DNA-damaging agent 4-nitroquinoline 1-oxide (4NQO), though not to gamma radiation or to hydrogen peroxide. The fusion of 4NQO-sensitive WRN and 4NQO-resistant control fibroblast cell lines generated proliferating WRN x control cell hybrids that expressed WRN protein and were 4NQO-resistant. These results establish the recessive nature of 4NQO sensitivity in WRN cell lines and provide a cellular assay for WRN protein function.
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