DNA replication in synchronized cultured mammalian cells. II. Replication of ribosomal cistrons in thymidine-synchronized HeLa cells

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HeLa cells synchronized by double thymidine treatment were used to determine when DNA homologous to 28 s ribosomal RNA is replicated during S (the synthetic phase of the cell cycle). DNA replicated during selected intervals of the S period was isolated from the remainder of the nuclear DNA by pulse-labeling with bromodeoxyuridine and cesium chloride density-gradient centrifugation. Hybridization of this fractionated DNA with HeLa 28 s RNA indicated that in these cells, DNA homologous to 28 s RNA replicates throughout the S period.

Original languageEnglish (US)
Pages (from-to)153-158
Number of pages6
JournalJournal of Molecular Biology
Issue number1
Publication statusPublished - Apr 14 1971


ASJC Scopus subject areas

  • Structural Biology
  • Molecular Biology

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