» Articles » PMID: 2476659

Temporal Order of Gene Replication in Chinese Hamster Ovary Cells

Overview
Journal Mol Cell Biol
Specialty Cell Biology
Date 1989 Jul 1
PMID 2476659
Citations 18
Authors
Affiliations
Soon will be listed here.
Abstract

To investigate the molecular basis of the regulatory mechanisms responsible for the orderly replication of the mammalian genome, we have developed an experimental system by which the replication order of various genes can be defined with relative ease and precision. Exponentially growing CHO-K1 cells were separated into populations representing various stages of the cell cycle by centrifugal elutriation and analyzed for cell cycle status flow cytometry. The replication of specific genes in each elutriated fraction was measured by labeling with 5-mercuri-dCTP and [3H]dTPP under conditions of optimal DNA synthesis after cell permeabilization with lysolecithin. Newly synthesized mercurated DNA from each elutriated fraction was purified by affinity chromatography on thiol-agarose and replicated with the large fragment of Escherichia coli DNA polymerase I by using [alpha-32P]dATP and random primers. The 32P-labeled DNA representative of various stages of the cell cycle was then hybridized with dot blots of plasmid DNA containing specific cloned genes. From these results, it was possible to deduce the nuclear DNA content at the time each specific gene replicated during S phase (C value). The C values of 29 genes, which included single-copy genes, multifamily genes, oncogenes, and repetitive sequences, were determined and found to be distributed over the entire S phase. Of the 28 genes studied, 19 had been examined by others using in vivo labeling techniques, with results which agreed with the replication pattern observed in this study. The replication times of nine other genes are described here for the first time. Our method of analysis is sensitive enough to determine the replication time of single-copy genes. The replication times of various genes and their levels of expression in exponentially growing CHO cells were compared. Although there was a general correlation between transcriptional activity and replication in the first half of S phase, examination of specific genes revealed a number of exceptions. Approximately 25% of total poly(A) RNA was transcribed from the late-replicating DNA.

Citing Articles

Insights into the Link between the Organization of DNA Replication and the Mutational Landscape.

Gaboriaud J, Wu P Genes (Basel). 2019; 10(4).

PMID: 30934791 PMC: 6523204. DOI: 10.3390/genes10040252.


Developmental control of the DNA replication and transcription programs.

Nordman J, Li S, Eng T, MacAlpine D, Orr-Weaver T Genome Res. 2010; 21(2):175-81.

PMID: 21177957 PMC: 3032921. DOI: 10.1101/gr.114611.110.


DNA replication timing: random thoughts about origin firing.

Rhind N Nat Cell Biol. 2006; 8(12):1313-6.

PMID: 17139278 PMC: 2861037. DOI: 10.1038/ncb1206-1313.


Specific signals at the 3' end of the DHFR gene define one boundary of the downstream origin of replication.

Mesner L, Hamlin J Genes Dev. 2005; 19(9):1053-66.

PMID: 15879555 PMC: 1091740. DOI: 10.1101/gad.1307105.


Coordination of replication and transcription along a Drosophila chromosome.

MacAlpine D, Rodriguez H, Bell S Genes Dev. 2004; 18(24):3094-105.

PMID: 15601823 PMC: 535919. DOI: 10.1101/gad.1246404.


References
1.
Holmquist G, Caston L . Replication time of interspersed repetitive DNA sequences in hamsters. Biochim Biophys Acta. 1986; 868(2-3):164-77. DOI: 10.1016/0167-4781(86)90019-9. View

2.
Land H, Chen A, Morgenstern J, Parada L, Weinberg R . Behavior of myc and ras oncogenes in transformation of rat embryo fibroblasts. Mol Cell Biol. 1986; 6(6):1917-25. PMC: 367729. DOI: 10.1128/mcb.6.6.1917-1925.1986. View

3.
DAndrea A, Tantravahi U, Lalande M, Perle M, LATT S . High resolution analysis of the timing of replication of specific DNA sequences during S phase of mammalian cells. Nucleic Acids Res. 1983; 11(14):4753-74. PMC: 326084. DOI: 10.1093/nar/11.14.4753. View

4.
Brennand J, Konecki D, Caskey C . Expression of human and Chinese hamster hypoxanthine-guanine phosphoribosyltransferase cDNA recombinants in cultured Lesch-Nyhan and Chinese hamster fibroblasts. J Biol Chem. 1983; 258(16):9593-6. View

5.
Huberman J, Riggs A . On the mechanism of DNA replication in mammalian chromosomes. J Mol Biol. 1968; 32(2):327-41. DOI: 10.1016/0022-2836(68)90013-2. View