Subphases of DNA replication in Drosophila cells

M. Rehak, I. Csuka, E. Szepessy, G. Banfalvi

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Exponentially growing Drosophila S2 cells in suspension culture were synchronized at low- and high-resolution centrifugal elutriation, and Dna synthesis was measured by [3h]-thymidine incorporation throughout the S phase. At low resolution, one repair peak at the G1/G0 border and two replication peaks known as early and late S subphases were observed. At high resolution, six chronologic compartments were distinguished. The distribution of these peaks indicated one repair peak at 2.05 C value, one minor replication peak at 2.43C, and four major subphases of replication corresponding to 2.64C, 2.89C, 3.32C, and 3.60C, representing 6.7%, 3.4%, 15.3%, 20.4%, 32.1%, and 22.0% of the synthetic activity, respectively. The five major peaks of cell growth with 2.32C, 2.56C, 2.85C, 3.18C, and 3.58C values consistently preceded those of replication subphases.

Original languageEnglish
Pages (from-to)607-612
Number of pages6
JournalDNA and Cell Biology
Issue number10
Publication statusPublished - Nov 8 2000


ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cell Biology

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