期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 22, 页码 8069-8074出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201500994
关键词
biosensors; circular templates; DNA; in vitro selection; rolling circle amplification
资金
- Natural Sciences and Engineering Research Council of Canada [227594-2009]
- Sentinel Bioactive Paper Network
- Ministry of Science and Technology of China [2012ZX09506001-010]
- National Natural Science Foundation of China [21302108]
- China Scholarship Council
Rolling circle amplification (RCA) has been widely used as an isothermal DNA amplification technique for diagnostic and bioanalytical applications. Because RCA involves repeated copying of the same circular DNA template by a DNA polymerase thousands of times, we hypothesized there exist DNA sequences that can function as optimal templates and produce more DNA amplicons within an allocated time. Herein we describe an in vitro selection effort conducted to search from a random sequence DNA pool for such templates for phi29 DNA polymerase, a frequently used polymerase for RCA. Diverse DNA molecules were isolated and they were characterized by richness in adenosine (A) and cytidine (C) nucleotides. The top ranked sequences exhibit superior RCA efficiency and the use of these templates for RCA results in significantly improved detection sensitivity. AC-rich sequences are expected to find useful applications for setting up effective RCA assays for biological sensing.
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