Zeitschrift für Vererbungslehre

, Volume 93, Issue 2, pp 287–300 | Cite as

DNA synthesis and induced mutations in the presence of 5-bromouracil I. DNA synthesis in the presence of 5-bromouracil

  • Eunice Strelzoff


An investigation has been carried out dealing with the incorporation of BU into DNA ofE. coli 15 thy under conditions of complete thymine deficiency. It was found that exponentially growing cells can increase their DNA 5-fold upon suspension in BU-supplemented medium. DNA increased in a linear fashion and followed the series ×, 2×, 3×, 4× where × is the amount of DNA initially present. If thy cells were starved for 30 minutes before being provided with BU, DNA appeared to increase stepwise although the increase during each period of synthesis was equal only to the amount of DNA initially present. Paper chromatography revealed that BU totally replaced thymine in the newly-synthesized DNA. Equilibrium density gradient techniques and radioactive labeling made it possible to ascertain that the DNA in which BU fully replaced thymine was functional on the primary level, that of “priming” or taking iart in the synthesis of new DNA. Cellular inhibition as indicated by lethality was described and possible explanations for the inhibition resulting from incroporation of BU into DNA were discussed.


Chromatography Density Gradient Thymine Paper Chromatography Linear Fashion 
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Copyright information

© Springer-Verlag 1962

Authors and Affiliations

  • Eunice Strelzoff
    • 1
    • 2
  1. 1.Department of ZoologyColumbia UniversityNew York
  2. 2.Medical CenterNew York UniversityNew York 16USA

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