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Development of a DNA aptamer to detect Brucella abortus and Brucella melitensis through cell SELEX | ||
| Iranian Journal of Veterinary Research | ||
| دوره 21، شماره 4 - شماره پیاپی 73، 2020، صفحه 294-300 اصل مقاله (582.63 K) | ||
| نوع مقاله: Full paper (Original article) | ||
| شناسه دیجیتال (DOI): 10.22099/ijvr.2020.36855.5378 | ||
| نویسندگان | ||
| Z. Nosaz1؛ S. Rasoulinejad2؛ S. L. Mousavi Gargari* 3 | ||
| 1MSc in Microbial Biotechnology, Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran | ||
| 2Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany | ||
| 3Department of Biology, Faculty of Basic Sciences, Shahed University, Tehran, Iran | ||
| چکیده | ||
| Background: Brucellosis is a zoonosis, caused by Brucella spp. which are small aerobic intracellular coccobacilli, localized in the reproductive organs of host animals, causing abortion and sterility. The diagnosis of this zoonosis is based on microbiological, serological or real time-polymerase chain reaction (RT-PCR) laboratory tests. Although the common microbiological and serological based assays have advantages, they are not able to solve the diagnosis problems. Aims: To overcome some of the limitations of present techniques, in this study, we developed an aptamer through whole-cell systematic evolution of Ligands by EXponential enrichment (SELEX) procedures to detect Brucella. Methods: We used mixture of Brucella melitensis and Brucella abortus as the target. In order to prepare the single-stranded DNA (ssDNA) aptamer, the DNA library was amplified with 5´-phosphorylated reverse primer and treated with lambda exonuclease. The SELEX procedure was performed by incubating the ssDNA pool with a bacterial suspension in a binding buffer. The selected procedures were monitored by flow cytometry using FITC-labelled forward primer. Aptamers with the highest binding affinity towards the target and the lowest to other strains were selected. Results: Two aptamers namely B20 and B21 showed significant binding affinity toward B. melitensis and B. abortus. The dissociation constant (Kd) for aptamers B20 and B21 was 40.179 ± 3.06 pM and 184.396 ± 465 pM, respectively. Conclusion: The isolated aptamers were able to identify B. melitensis and B. abortus with a remarkable binding efficiency and appropriated Kd in a picoMolar range and therefore can be good candidates in the development of any rapid assay test implanted on routine brucellosis diagnoses. | ||
| کلیدواژهها | ||
| Brucella؛ Cell SELEX؛ DNA aptamer؛ Flow cytometry | ||
| مراجع | ||
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