Article
Genome instability in ataxia telangiectasia (A-T) families: camptothecin-induced damage to replicating DNA discriminates between obligate A-T heterozygotes, A-T homozygotes and controls.
Bioscience reports - 1 Dec 2004
Leonard Jay C, Mullinger Ann M, Schmidt John, Cordell Heather J, Johnson Robert T
Abstract excerpt
Previously we used the topoisomerase I inhibitor camptothecin (CPT), which kills mainly S-phase cells primarily by inducing double strand breaks (DSBs) in replication forks, to show that ataxia telangiectasia (A-T) fibroblasts are defective in the repair of this particular subclass of DSBs. CPT treated A-T cells reaching G2 have abnormally high levels of chromatid exchanges, viewed as prematurely condensed G2...
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