Protein detection via direct enzymatic amplification of short DNA aptamers

Aptamers are single-stranded nucleic acids that fold into defined tertiary structures to bind target molecules with high specificities and affinities. DNA aptamers have garnered much interest as recognition elements for biodetection and diagnostic applications due to their small size, ease of discov...

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Veröffentlicht in:Analytical biochemistry 2008-02, Vol.373 (1), p.121-128
Hauptverfasser: Fischer, Nicholas O., Tarasow, Theodore M., Tok, Jeffrey B.-H.
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Tarasow, Theodore M.
Tok, Jeffrey B.-H.
description Aptamers are single-stranded nucleic acids that fold into defined tertiary structures to bind target molecules with high specificities and affinities. DNA aptamers have garnered much interest as recognition elements for biodetection and diagnostic applications due to their small size, ease of discovery and synthesis, and chemical and thermal stability. Here we describe the design and application of a short DNA molecule capable of both protein target binding and amplifiable bioreadout processes. Because both recognition and readout capabilities are incorporated into a single DNA molecule, tedious conjugation procedures required for protein–DNA hybrids can be omitted. The DNA aptamer is designed to be amplified directly by either polymerase chain reaction (PCR) or rolling circle amplification (RCA) processes, taking advantage of real-time amplification monitoring techniques for target detection. A combination of both RCA and PCR provides a wide protein target dynamic range (1 μM to 10 pM).
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subjects Aptamers
Aptamers, Nucleotide - chemistry
Base Sequence
DNA Primers
Enzymes - chemistry
Limit of detection
PCR
Polymerase Chain Reaction
Proteins - analysis
Rolling circle amplification
title Protein detection via direct enzymatic amplification of short DNA aptamers
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