PMID: 4899877Jul 1, 1969Paper

Evidence for multiple growing points on the genome of rapidly growing E. coli B-r

Proceedings of the National Academy of Sciences of the United States of America
C B Ward, D A Glaser

Abstract

Synchronized cultures of rapidly growing E. coli B/r cells were starved for a required amino acid at various cell ages to allow ongoing chromosome replication to be completed without initiation of new replication cycles. It has been found that when such synchronized cultures are exposed to the mutagen nitrosoguanidine, genetic markers just in the process of replication show a markedly higher mutation rate than markers elsewhere on the chromosome. The number of growing points on the chromosome at each cell age can then be determined by observing the nitrosoguanidine-induced mutation rates for specific genetic markers on the genome. These experiments indicate that there exist multiple growing points on the genome for about ten minutes during the life cycle when the cells are growing with a doubling time of 28 minutes.

References

Feb 14, 1968·Journal of Molecular Biology·C E Helmstetter
Apr 1, 1961·Journal of Molecular Biology·O MAALOE, P C HANAWALT
Oct 1, 1963·Proceedings of the National Academy of Sciences of the United States of America·C E HELMSTETTER, D J CUMMINGS
Nov 1, 1963·Journal of Molecular Biology·F BONHOEFFER, A GIERER
Oct 1, 1964·Proceedings of the National Academy of Sciences of the United States of America·Z OPARA-KUBINSKAW SZYBALSKI

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Citations

Jun 1, 1975·Proceedings of the National Academy of Sciences of the United States of America·D L Parker, D A Glaser
Jan 1, 1973·Progress in Biophysics and Molecular Biology·D W Smith
Jan 1, 1974·Journal of Theoretical Biology·C W Dingman
Mar 24, 1971·Nature: New Biology·N GuerolaE Cerdá-Olmedo

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