Nucleic Acids Research, Vol 26, Issue 22 5073-5078, Copyright © 1998 by Oxford University Press
J Baner, M Nilsson, M Mendel-Hartvig and U Landegren
Circularizing oligonucleotide probes (padlock probes) have the potential to
detect sets of gene sequences with high specificity and excellent
selectivity for sequence variants, but sensitivity of detection has been
limiting. By using a rolling circle replication (RCR) mechanism,
circularized but not unreacted probes can yield a powerful signal
amplification. We demonstrate here that in order for the reaction to
proceed efficiently, the probes must be released from the topological link
that forms with target molecules upon hybridization and ligation. If the
target strand has a nearby free 3' end, then the probe-target hybrids can
be displaced by the polymerase used for replication. The displaced probe
can then slip off the targetstrand and a rolling circle amplification is
initiated. Alternatively, the target sequence itself can prime an RCR after
its non-base paired 3' end has been removed by exonucleolytic activity. We
found the Phi29 DNA polymerase to be superior to the Klenow fragment in
displacing the target DNA strand, and it maintained the polymerization
reaction for at least 12 h, yielding an extension product that represents
several thousand-fold the length of the padlock probe.
ARTICLES
Signal amplification of padlock probes by rolling circle replication
The Beijer Laboratory, Department of Genetics and Pathology, Uppsala University, Box 589, Se-751 23 Uppsala, Sweden.
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