Deoxyribonucleic Acid Replication in Fetal Cells

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Abstract

OBJECTIVES

Our purpose was to develop a sensitive method for assessing the replication time of specific human genes in cultured fetal cells and for detecting potential replication defects.

STUDY DESIGN

Synchronous progression of diploid human fetal lung cells through S phase was achieved by releasing from serum restriction with minimum essential medium alpha modification plus 10% fetal bovine serum, followed by hydroxyurea blockage at the G1/S boundary. Deoxyribonucleic acid replication was studied in permeabilized cells using mercurated nucleotides to label nascent deoxyribonucleic acid.

RESULTS

A high degree of synchrony in traversal of S phase was indicated by flow cytometry and a well-defined 7-hour period of deoxyribonucleic acid synthesis. The replication of the topoisomerase II gene occurred in a narrow time span 3 hours after entry into S phase.

CONCLUSIONS

Fetal cells have been highly synchronized at the beginning of S phase, and the replication time of a specific gene can be defined within a narrow time window. (AM J OBSTET GYNECOL 1994;170:468-73.)

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