Isothermal amplification detection of miRNA based on the catalysis of nucleases and voltammetric characteristics of silver nanoparticles.

Abstract:

:MiRNAs are a fascinating kind of biomolecule due to their vital functions in gene regulation and potential value as biomarkers for serious diseases including cancers. Exploiting convenient and sensitive methods for miRNA expression assays is imperative. In this study, we employ an exonuclease (RecJf) and a nicking endonuclease (Nt.BbvCI) to catalyse isothermal reactions for the amplified detection of miRNA. The degree of cyclical enzymatic amplification depends on the initial target miRNA level, which can determine the density of DNA probes bound on the electrode surface. Since DNA probes with an amino group at the 3' end are able to locate silver nanoparticles on the electrode, which provide intense stripping responses, the sensitive quantification of miRNA can be achieved. The proposed method has a limit of detection as low as 35 aM, with remarkable specificity, which offers a new approach for investigating miRNA networks and for clinical diagnosis applications.

journal_name

Mol Biosyst

journal_title

Molecular bioSystems

authors

Xu J,Han K,Liu D,Lin L,Miao P

doi

10.1039/c6mb00659k

subject

Has Abstract

pub_date

2016-11-15 00:00:00

pages

3550-3555

issue

12

eissn

1742-206X

issn

1742-2051

journal_volume

12

pub_type

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