PMID: 698228Aug 23, 1978Paper

Replication of the genes coding for 5 S RNA in synchronized HeLa cells

Biochimica Et Biophysica Acta
C Ho, R W Armentrout

Abstract

The duplication of the genes coding for 5-S RNA has been followed during the S phase of HeLa cell cultures synchronized by mitotic detechment. Replication was analyzed by exposing the cultures to bromodeoxyuridine (BrdUrd) for 3 h at successive intervals and analyzing the DNA product in CsCl density gradients. DNA containing the 5-S genes was detected in the gradients by molecular hybridization using purified 125I-labeled 5 S RNA. In addition, as an internal marker of S phase chronology, late DNA replication was followed by examining the incorporation of [3H]thymidine into repetitive DNA (C0t less than 0.01 fraction). The results indicated that greater than 85% of the cells in the culture were synchronously dividing and that greater than 80% of the 5-S genes replicate in the first half of S phase, whereas the rapidly reassociating fraction of the DNA replicates in the second half of S phase.

Citations

May 1, 1981·Proceedings of the National Academy of Sciences of the United States of America·E EpnerP A Marks
May 30, 1980·Biochimica Et Biophysica Acta·S WolterR W Armentrout

❮ Previous
Next ❯

Related Concepts

Related Feeds