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- W334300912 abstract "Padlock probes are useful in a variety of genetic applications, some of which require that the probes are amplified in order to generate detectable signals. Two general padlock amplification methods, RCA and PCR, are discussed in this thesis.The isothermal rolling circle amplification (RCA) mechanism is described in detail as well as how a target strand affects primer extension. A mechanism to resolve the topological constraint imposed by the target strand, to which a padlock probe has been linked, is also discussed. We also present a more powerful amplification technique, termed serial circle amplification, which provides a highly precise tool for nucleic acid studies. Rolling circle products are digested to unit lengths, and each monomer converted to new circular oligonucleotides that can serve as templates in consecutive rounds of RCA. The final products are single-stranded DNA molecules, readily available for hybridization-based detection, for instance using molecular beacons or array hybridization.Padlock probes have the potential to be combined in large numbers for parallel gene analysis. A significant improvement of the level of multiplexed genotyping is presented using padlock probes and a molecular inversion strategy. Padlock probes containing common primer sequences along with locus-specific tag sequences were combined in multiplexed ligation reactions. After exonucleolytic selection for circular molecules, the probes were cleaved at uracil residues situated between the primer sequences, which facilitated release from the genomic DNA. A single PCR primer pair amplified all molecularly inverted probes, and the products were finally sorted on microarrays for simultaneous readout. Up to 1,500 genotypes could be detected in parallel, with sufficient signal strength for further scale-up. Finally, an application of the same parallel genotyping strategy is described where a set of padlock probes was used to study tumor induced immune responses. The distribution of TCR Vβ transcripts in tumor infiltrating T-cells and in normal control tissues were investigated in a microarray format." @default.
- W334300912 created "2016-06-24" @default.
- W334300912 creator A5027126852 @default.
- W334300912 date "2003-01-01" @default.
- W334300912 modified "2023-09-23" @default.
- W334300912 title "Genetic analyses using rolling circle or PCR amplified padlock probes." @default.
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