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Considerations on the mechanism of differential Giemsa staining of BrdU-substituted chromosomes

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Summary

The staining properties of unifilarly bromodeoxyuridine (BrdU)-substituted chromatids were compared using fluorescent-plus-Giemsa (FPG) staining methods. It was found that the staining intensity of chromatids which had incorporated BrdU in the next to last S-phase is less than that of chromatids whose BrdU-containing strand came from the last cell cycle. Thus, FPG-staining is not a function of the number of BrdU-substituted DNA strands alone. These findings lead to the conclusion that the primary point of action of PFG staining leading to sister chromatid differentiation (SCD) are chromosomal proteins which have been altered in the replication of BrdU-substituted DNA and that the demonstration of the SCD and replication patterns with the same staining procedure is based on different mechanisms.

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  1. Abteilung Klinische Genetik der Universität Ulm, Oberer Eselsberg, D-7900, Ulm/Donau, Germany

    Günter Speit

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  1. Günter Speit
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Speit, G. Considerations on the mechanism of differential Giemsa staining of BrdU-substituted chromosomes. Hum Genet 67, 264–269 (1984). https://doi.org/10.1007/BF00291353

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  • DOI: https://doi.org/10.1007/BF00291353

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