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Proceedings Paper

Fiber optic system for rapid analysis of amplified DNA fragments
Author(s): J. Matthew Mauro; Lynn Kim Cao; Joel P. Golden
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Paper Abstract

We have developed a fiber optic sensor for rapid and direct analysis of PCR-amplified DNA fragments with minimal sample processing and real-time data readout. To accomplish this, a novel DNA-recognition system was built onto the surface of fused silica fibers. DNA fragments, labeled with a fluorophore during amplification, are bound to and detected at the fiber surface by means of evanescent wave excitation/emission. Excess unincorporated fluorescent single-stranded oligonucleotide PCR primers make only a small contribution to the signal, as the modified fiber surface only efficiently binds double-stranded DNA with the proper PCR-incorporated terminal nucleotide sequence (5'-ATGACTCAT-3'). The surface- bound double-stranded DNA recognition element utilizes a genetically engineered dimeric sequence-specific DNA binding protein. Self-assembly into the proper conformation for binding DNA occurs by means of specific interactions of the active dimer with the Fc domains of a layer of IgG molecules (antibodies) covalently attached directly to the fiber surface. The modified fiber surface is regenerated between samples by stripping away bound DNA with high salt concentrations.

Paper Details

Date Published: 1 April 1996
PDF: 12 pages
Proc. SPIE 2680, Ultrasensitive Biochemical Diagnostics, (1 April 1996); doi: 10.1117/12.237615
Show Author Affiliations
J. Matthew Mauro, Geo-Centers, Inc. (United States)
Lynn Kim Cao, Geo-Centers, Inc. (United States)
Joel P. Golden, Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 2680:
Ultrasensitive Biochemical Diagnostics
Gerald E. Cohn; Steven A. Soper; C. H. Winston Chen, Editor(s)

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