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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Responses of Huntington's disease and ataxia telangiectasia lymphoblastoid cells to bleomycin.

Ionizing radiation sensitive, mutant human lymphoblastoid cell lines derived from patients with Huntington's disease ( HD), or ataxia telangiectasia (AT) both showed cross sensitivity to bleomycin, as assayed by reduced cell viability and increased frequency of chromosome aberrations compared to normal controls. In contrast to AT cells which failed to show inhibition of DNA synthesis after exposure to ionizing radiation, or bleomycin treatment, the sensitive cells from HD patients had depressed rates of DNA synthesis after damage with these agents, similar to that seen in normal cells. In terms of progression through the cell cycle bleomycin damaged AT cells moved from G1 into S and from S to G2 + M at almost the same rate as untreated cells. Bleomycin treated HD cells showed a large proportion of cells blocked in G1, cells were slowed down in S, the rate of entry to G2 + M was reduced and only 5% of cycling cells reached G2. Progress through the cell cycle in normal cells exposed to bleomycin showed a partial block in G1 and the rate of entry to G2 + M was reduced. These differences in response of normal, AT and HD cells to ionizing radiation and bleomycin treatment indicates that the defect underlying the sensitivity is different in HD cells from that in AT cells.[1]


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