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Fibroblasts of a patient with Bloom syndrome (GM-1492) were cultured in the presence of either mitomycin C, ethylmethanesulfonate, or 4-nitroquinoline-1-oxide, (4-NQ1-O) and sister chromatid exchange was determined. The mutagens enhanced the sister chromatid exchange rate to different degrees, 4-NQ1-O being the most potent substance. Bloom corrective factor, which is present in normal cell-conditioned culture medium, reduced the spontaneously increased SCE in Bloom syndrome cells by about 20 SCE per metaphase but failed to reduce the additional mutagen-induced SCE increase. These findings indicate that only spontaneously, but not mutagen-induced, SCE in Bloom syndrome fibroblasts can be decreased by the Bloom corrective factor.
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H W Rüdiger
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U Schmidt-Preuss, and
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U Schmidt-Preuss, and
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U Schmidt-Preuss, and
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U Schmidt-Preuss, and
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U Schmidt-Preuss, and
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H W Rüdiger
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U Schmidt-Preuss, and
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H W Rüdiger
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U Schmidt-Preuss, and
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U Schmidt-Preuss, and
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