title: A highly sensitive target-primed rolling circle amplification (TPRCA) method for fluorescent in situ hybridization detection of microRNA in tumor cells.
abstract: The ability to detect spatial and temporal microRNA (miRNA) distribution at the single-cell level is essential for understanding the biological roles of miRNAs and miRNA-associated gene regulatory networks. We report for the first time the development of a target-primed RCA (TPRCA) strategy for highly sensitive and selective in situ visualization of miRNA expression patterns at the single-cell level. This strategy uses a circular DNA as the probe for in situ hybridization (ISH) with the target miRNA molecules, and the free 3' terminus of miRNA then initiates an in situ RCA reaction to generate a long tandem repeated sequence with thousands of complementary segments. After hybridization with fluorescent detection probes, target miRNA molecules can be visualized with ultrahigh sensitivity. Because the RCA reaction can only be initiated by the free 3' end of target miRNA, the developed strategy offers the advantage over existing ISH methods in eliminating the interference from precursor miRNA or mRNA. This strategy is demonstrated to show high sensitivity and selectivity for the detection of miR-222 expression levels in human hepatoma SMMC-7721 cells and hepatocyte L02 cells. Moreover, the developed TPRCA-based ISH strategy is successfully applied to multiplexed detection using two-color fluorescent probes for two miRNAs that are differentially expressed in the two cell lines. The results reveal that the developed strategy may have great potential for in situ miRNA expression analysis for basic research and clinical diagnostics.
authors.affiliation: State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University , Changsha 410082, P. R. China.
authors.forename: Jia
authors.initials: J
authors.lastname: Ge
authors.forename: Liang-Liang
authors.initials: LL
authors.lastname: Zhang
authors.forename: Si-Jia
authors.initials: SJ
authors.lastname: Liu
authors.forename: Ru-Qin
authors.initials: RQ
authors.lastname: Yu
authors.forename: Xia
authors.initials: X
authors.lastname: Chu
mesh_terms: D001483:Base Sequence; D045744:Cell Line, Tumor; D003116:Color; D017931:DNA Primers / Q000235:genetics*; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D017404:In Situ Hybridization, Fluorescence / Q000379:methods*; D035683:MicroRNAs / Q000235:genetics* / Q000378:metabolism*; D057054:Molecular Imaging; D021141:Nucleic Acid Amplification Techniques / Q000379:methods*; D062211:Spatio-Temporal Analysis
chemical_list: D017931:DNA Primers; D035683:MicroRNAs