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Nucleic Acids Research, 1988, Vol. 16, No. 9 4077-4095
© 1988

Articles

Synthesis and hybridization of a series of biotinylated oligonucleotides

Alan F. Cook, Edmund Vuocolo and Christine L. Brakel

Enzo Biochem, Inc. 325 Hudson Street, New York, NY 10013, USA

Received January 21, 1988. Revised March 21, 1988. Accepted March 21, 1988.

A series of oligonucleotides containing biotin-11-dUMP at various positions were synthesized and compared in quantitative, colorimetric hybridization-detection studies. A deoxyuridine phosphoramidite containing a protected allylamino sidearm was synthesized and used in standard, automated synthesis cycles to prepare oligonucleotides with allylamino residues at various positions within a standard 17-base sequence. Biotin substituents were subsequently attached to the allylamino sidearms by reaction with N-biotinyl-6-aminocaproic acid N-hydroxysuccinimide ester. These oligomers were hybridized to target DNA immobilized on microtiter wells (ELISA plates), and were detected with a streptavidin-biotinylated horseradish peroxidase complex using hydrogen peroxide as substrate and o-phenylenediamine as chromogen. We found that the sensitivity of detection of target DNA by biotin-labeled oligonucleotide probes was strongly dependent upon the position of the biotin label. Oligonucleotides containing biotin labels near or off the ends of the hybridizing sequence were more effective probes than oligonucleotides containing internal biotin labels. An additive effect of increasing numbers of biotin-dUMP residues was found for some labeling configurations.


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