Detection of DNA mutations using a capacitive micro-membrane array.
The detection of DNA hybridization using capacitive readout and a biosensor array of ultrathin Si membranes is presented. The biosensor exploits the ability of the ultrathin membranes to deflect upon surface stress variations caused by biological interactions. Probe DNA molecules are immobilized on the membrane surface and the surface stress variations during hybridization with their complementary strands force the membrane to deflect and effectively change the capacitance between the flexible membrane and the fixed substrate. The sensor array comprises 256 such sensing sites thus allowing the concurrent sensing of multiple DNA mutations. The biosensor and its performance for the detection of complementary DNA strands are demonstrated using beta-thalassemia oligonucleotides. The experimental results show that the presented sensors are able to detect DNA hybridization and to discriminate single nucleotide mismatches.
Tsouti
Vasiliki
V
Institute of Microelectronics NCSR Demokritos, Terma Patriarchou Grigoriou, Aghia Paraskevi, 15310 Athens, Greece. vasso@imel.demokritos.gr
Boutopoulos
Christos
C
Andreakou
Peristera
P
Ioannou
Marina
M
Zergioti
Ioanna
I
Goustouridis
Dimitris
D
Kafetzopoulos
Dimitris
D
Tsoukalas
Dimitris
D
Normand
Pascal
P
Chatzandroulis
Stavros
S
D015374:Biosensing Techniques / Q000295:instrumentation*; D004247:DNA / Q000737:chemistry* / Q000235:genetics*; D004252:DNA Mutational Analysis / Q000295:instrumentation*; D004867:Equipment Design; D006801:Humans; D055616:Microtechnology; D009154:Mutation; D009693:Nucleic Acid Hybridization; D020411:Oligonucleotide Array Sequence Analysis / Q000295:instrumentation*; D009841:Oligonucleotides / Q000235:genetics; D012825:Silicon; D013499:Surface Properties; D017086:beta-Thalassemia / Q000235:genetics
D009841:Oligonucleotides; D004247:DNA; D012825:Silicon