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Exposure and removal of stainable groups during Feulgen acid hydrolysis of fixed chromatin at different temperatures

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Summary

Hyperdiploid Ehrlioh's ascites tumour cells grown in male mice (strain NMRI) were labeled with radioactive nucleotides. The nucleic acids were extracted from fixed, air-dried smears by fractionated hydrolysis and their radioactivity measured by liquid scintillation. The experiments showed that the exposure of aldehydes through removal of purine bases and the elimination of these aldehydes through depolymerisation of DNA were the two main processes responsible for the Feulgen hydrolysis curve. They were shown to be independent and overlapping. The depurination can be described as a simple hydrolytic reaction, while the extraction of DNA depends on a number of different factors. This entails that, in the Feulgen acid hydrolysis procedure, the part of DNA measured is dependent upon the stability of the chromatin. It was found that it is possible accurately to determine the depolymerisation process and thereby roughly correct the measured amount of Feulgen DNA.

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Authors and Affiliations

  1. Zoophysiological Institute, University of Lund, Sweden

    Gunnar K. A. Andersson & Per T. T. Kjellstrand

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  1. Gunnar K. A. Andersson
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  2. Per T. T. Kjellstrand
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Andersson, G.K.A., Kjellstrand, P.T.T. Exposure and removal of stainable groups during Feulgen acid hydrolysis of fixed chromatin at different temperatures. Histochemie 27, 165–172 (1971). https://doi.org/10.1007/BF00284958

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  • DOI: https://doi.org/10.1007/BF00284958

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