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Updated: Apr 18, 2026

Production of Double-stranded DNA Ministrings
Published on: February 29, 2016
Reduction in the structural instability of cloned eukaryotic tandem-repeat DNA by low-temperature culturing of host
Watcharaporn Thapana1, Penporn Sujiwattanarat1, Kornsorn Srikulnath2
1Primate Research Institute, Kyoto University,Inuyama City 484-8506,Japan.
Abstract:
Summary For accurate analyses of eukaryotic tandem-repeat DNA, it is often required to clone a genomic DNA fragment into a bacterial plasmid. It is, however, a serious problem that tandem-repeat DNA is frequently subjected to structural changes during maintenance or amplification in the host bacteria. Here, we show an example of a clear difference in the instability of tandem-repeat DNA between different culturing temperatures. A fragment of monkey centromeric DNA carried by pUC19 was considerably degraded by culturing bacteria at 37 °C, but the damage was reduced at 25 °C. Thus, culturing temperature is a significant factor for avoiding degradation, in addition to the genotype of the host bacteria.
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