Label-free electrical detection of pyrophosphate generated from DNA polymerase reactions on field-effect devices.

Label-free electrical detection of pyrophosphate generated from DNA polymerase reactions on field-effect devices.
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DOI:
10.1039/c2an15930a
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发表时间:
2012-03-21
期刊:
The Analyst
影响因子:
--
通讯作者:
Varma M
Varma M
中科院分区:
其他
文献类型:
--
作者:
Credo GM;Su X;Wu K;Elibol OH;Liu DJ;Reddy B Jr;Tsai TW;Dorvel BR;Daniels JS;Bashir R;Varma M

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We introduce a label-free approach for sensing polymerase reactions on deoxyribonucleic acid (DNA) using a chelator-modified silicon-on-insulator field-effect transistor (SOI-FET) that exhibits selective and reversible electrical response to pyrophosphate anions. The chemical modification of the sensor surface was designed to include rolling-circle amplification (RCA) DNA colonies for locally enhanced pyrophosphate (PPi) signal generation and sensors with immobilized chelators for capture and surface-sensitive detection of diffusible reaction by-products. While detecting arrays of enzymatic base incorporation reactions is typically accomplished using optical fluorescence or chemiluminescence techniques, our results suggest that it is possible to develop scalable and portable PPi-specific sensors and platforms for broad biomedical applications such as DNA sequencing and microbe detection using surface-sensitive electrical readout techniques.
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