Aptamer; Dot blot assay; G-quadruplex; Interleukin-2; SELEX stringency; Multidisciplinary
Abstract :
[en] Aptamers are short single-stranded oligonucleotides capable of binding to various targets with high specificity and affinity. This study aimed to identify an aptamer against mouse interleukin-2 (mIL-2) as one of the most important cytokines in autoimmune diseases for diagnostic and therapeutic purposes. For this purpose, 14 SELEX rounds were performed on recombinant mIL-2 with high stringency. The dot blot and flow cytometry techniques were conducted to determine affinity, dissociation constant (Kd), specificity, and SELEX rounds screening. The stringency of rounds was considered based on aptamer/target incubation time, washing steps, and target proteins. Finally, the aptamer's structure was mapped and predicted by M-fold and QGRS Mapper web-based software. After 14 rounds, the flow cytometry analysis revealed that the 11th round was a proper round. The high-affinity aptamers M20 and M15 were chosen for their ability to bind mIL-2. According to DNA folding software, M20 and M15 aptamers had G-quadruplex and stem-loop structures, respectively. The M20 aptamer affinity was greater than M15, and its predicted Kd was 91 nM. A simple SELEX protocol with round stringency was explained to identify DNA aptamers against protein targets. The reported G-quadruplex aptamer might have potential diagnostic or therapeutic application in IL-2-related disorders.
Disciplines :
Laboratory medicine & medical technology
Author, co-author :
Momeni, Mohsen ; Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Biologie cellulaire et moléculaire ; Immuno-Biochemistry Lab, Immunology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
Mashayekhi, Kazem; Immunology of Infectious Diseases Research Center, Research Institute of Basic Medical Sciences, Rafsanjan University of Medical Sciences, Rafsanjan, Iran
Navashenaq, Jamshid Gholizadeh ; Noncommunicable Diseases Research Center, Bam University of Medical Sciences, Bam, Iran
Sankian, Mojtaba; Immuno-Biochemistry Lab, Immunology Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
Language :
English
Title :
Identification of G-quadruplex anti-Interleukin-2 aptamer with high specificity through SELEX stringency.
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