Non-random segregation of DNA strands in Escherichia coli B r

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Abstract

The segregation of DNA strands during growth of Escherichia coli B r has been studied under conditions in which the chromosomal configuration and the ancestry of the cells during growth and division were known. Cells containing either one or two replicating chromosomes were pulse-labeled with [3H]thymidine, and the location of the radioactivity within chains of cells formed by growth in methylcellulose was determined by autoradiography. The locations of the radioactive cells within chains obtained after the second, third and fourth divisions were consistent with the co-segregation of only one of the replicating strands of each chromosome and a fixed region of the cell into daughter cells. The attachment of this strand to the region appeared to become permanent at the time the strand was used for the first time as a template. It is concluded that the segregation of DNA molecules into daughter cells is non-random in E. coli B/r. © 1973.

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Pierucci, O., & Zuchowski, C. (1973). Non-random segregation of DNA strands in Escherichia coli B r. Journal of Molecular Biology, 80(3), 477–503. https://doi.org/10.1016/0022-2836(73)90417-8

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