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  • 1.
    Nilsson, Peter
    et al.
    KTH, Superseded Departments, Biotechnology.
    O'Meara, Deirdre
    KTH, Superseded Departments, Biotechnology.
    Edebratt, Fredrik
    KTH, Superseded Departments, Biotechnology.
    Persson, Björn
    Uhlén, Mattias
    KTH, Superseded Departments, Biotechnology.
    Lundeberg, Joakim
    KTH, Superseded Departments, Biotechnology.
    Nygren, Per-Åke
    KTH, Superseded Departments, Biotechnology.
    Quantitative Investigation of the Modular Primer Effect for DNA and Peptide Nucleic Acid Hexamers1999In: Analytical Biochemistry, ISSN 0003-2697, E-ISSN 1096-0309, Vol. 269, no 1, p. 155-161Article in journal (Refereed)
    Abstract [en]

    The effect on oligonucleotide–template duplex stability upon cohybridization of adjacently annealing oligonucleotides, the modular primer effect, was studied with biosensor technology. DNA and peptide nucleic acid (PNA) hexamer modules and sensor chip-immobilized template DNA strands were designed for analysis of nick, overlap, and gap modular hybridization situations. The fast hybridization kinetics for such hexamer modules allowed for the determination of apparent duplex affinities from equilibrium responses. The results showed that the hybridizational stability of modular hexamer pairs is strongly dependent on the positioning, concentration, and inherent affinity of the adjacently annealing hexamer module. Up to 80-fold increases in apparent affinities could be observed for adjacent modular oligonucleotide pairs compared to affinities determined for single hexamer oligonucleotide hybridizations. Interestingly, also for coinjections of different module combinations where DNA hexamer modules were replaced by their PNA counterparts, a modular primer effect was observed. The introduction of a single base gap between two hexamer modules significantly reduced the stabilization effect, whereas a gap of two bases resulted in a complete loss of the effect. The results suggest that the described biosensor-based methodology should be useful for the selection of appropriate modules and working concentrations for use in different modular hybridization applications.

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