We have explored a simplified system without purification for systematic evolution of ligands by exponential enrichment (SELEX) against Vibrio alginolyticus to select single-stranded DNA ligands (aptamers) from a random 82-nt library. The DNA content was quantified by agarose gel electrophoresis and follow-up image analyses with theBandScan 5.0 software. Anti-digoxigenin/HRP system was used to determine the binding activity of aptamers for V. alginolyticus. The results showed that the affinity of aptamers increased gradually with the increase of screening rounds, indicating that the lack of purification did not affect screening results but rather made SELEX screening much more convenient and significantly increased the efficiency.
Key words: Aptamers, purification, systematic evolution of ligands by exponential enrichment (SELEX), Vibrio alginolyticus.
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