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Solid-Phase PCR with Hybridization and Time-resolved Fluorometry for Detection of HLA-B27

¹ JDF Center for Prevention of Type 1 Diabetes in Finland, and Departments of
² Virology and
³ Biotechnology, University of Turku, Turku, Finland.
^a Address correspondence to this author at: MediCity Research Laboratories, Tykistökatu 6 A, 4th floor, FIN-20520 Turku, Finland. Fax 358-2-333-7000; e-mail minna.sjoroos{at}utu.fi.

Background: Preactivated solid surfaces provide new possibilities for multiple consecutive reactions in a microtiter plate format. In this study, a combination of PCR and subsequent hybridization in the same microtiter well was applied for the detection of HLA-B27 alleles.

Methods: A multiplex solid-phase PCR to amplify the HLA-B27 alleles together with ß-actin as an amplification control gene was performed on the NucleoLink^TM (Nunc) surface. PCR was followed by hybridization and detection with time-resolved fluorescence. For the covalent capture of the PCR primers onto the solid support via a 1-(3-dimethylamino-propyl)-3-ethylcarbodiimide hydrochloride-mediated reaction, different 5'-end modifications of oligonucleotides were tested [amination, phosphorylation, and a poly(dT)₁₀ linker].

Results: For covalent immobilization of the primers, amination of the 5' end combined with use of the poly(dT)₁₀ linker was superior. At least 19.5% of the primer added per well was attached via a stable bond. When the standard time-resolved, fluorescence-based HLA-B27 detection system was compared with the newly developed method in a sample series of 82 genomic DNAs and the corresponding dried-blood spots, all results were in full agreement.

Conclusions: The new solid-phase PCR approach can be applied for multiple-target DNA detection. PCR followed by hybridization can be accomplished in a few hours using precoated strips and dried-blood spot PCR templates.

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