A simple surface plasmon resonance biosensor for detection of PML/RAR? based on heterogeneous fusion gene-triggered nonlinear hybridization chain reaction.

ABSTRACT: In this work, a simple and enzyme-free surface plasmon resonance (SPR) biosensing strategy has been developed for highly sensitive detection of two major PML/RAR? (promyelocytic leukemia, retinoic acid receptor alpha) subtypes based on the heterogeneous fusion gene-triggered nonlinear hybridization chain reaction (HCR). On the gold chip surface, the cascade self-assembly process is triggered after the introduction of PML/RAR?. The different fragments of PML/RAR? can specifically hybridize with capture probes (Cp) immobilized on the chip and the hybridization DNA₁ (H₁). Then, the nonlinear HCR is initiated by the complex of Cp-PML/RAR?-H₁ with the introduction of two hybridization DNA chains (H₂ and H₃). As a result, a dendritic nanostructure is achieved on the surface of chip, leading to a significant SPR amplification signal owing to its high molecular weight. The developed method shows good specificity and high sensitivity with detection limit of 0.72 pM for "L" subtype and 0.65 pM for "S" subtype. Moreover, this method has been successfully applied for efficient identification of clinical positive and negative PCR samples of the PML/RAR? subtype. Thus, this developed biosensing strategy presents a potential platform for analysis of fusion gene and early diagnosis of clinical disease.

SUBMITTER: Guo B 

PROVIDER: S-EPMC5656617 | biostudies-literature | 2017 Oct

REPOSITORIES: biostudies-literature