DNA microarrays for hybridization detection by surface plasmon resonance spectroscopy.
We report on the development of a new platform technology for the detection of genetic variations by means of surface plasmon resonance (SPR) spectroscopy. TOPAS chips with integrated optics were exploited in combination with microfluidics. Within minutes, the detection of hybridization kinetics was achieved simultaneously at all spots of the DNA microarray. A nanoliter dispenser is used to deposit thiol-modified single-stranded probe DNA on the gold surface of the chips. We investigated the influence of different parameters on hybridization using model polymerase chain reaction (PCR) products. These PCR products comprised a single-stranded tag sequence being complementary to an anti-tag sequence of probes immobilized on the gold surface. The signals increased with increasing length of PCR products (60, 100 or 300 base pairs) as well as with their concentration. We investigated hybridizations on DNA microarrays comprising 90 spots of probe DNA with three different sequences. Furthermore, we demonstrate that sequences with possible hairpin structures significantly lower the binding rate, and thus, the SPR signals during hybridization.
Kick
Alfred
A
Professur für Physikalische Chemie, Mess- und Sensortechnik, Technische Universität Dresden, 01062 Dresden, Germany.
Bönsch
Martin
M
Katzschner
Beate
B
Voigt
Jan
J
Herr
Alexander
A
Brabetz
Werner
W
Jung
Martin
M
Sonntag
Frank
F
Klotzbach
Udo
U
Danz
Norbert
N
Howitz
Steffen
S
Mertig
Michael
M
D001483:Base Sequence; D015342:DNA Probes / Q000737:chemistry / Q000235:genetics; D009690:Nucleic Acid Conformation; D009693:Nucleic Acid Hybridization; D020411:Oligonucleotide Array Sequence Analysis / Q000295:instrumentation* / Q000379:methods; D016133:Polymerase Chain Reaction; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods
D015342:DNA Probes