title: Rapid one-step selection method for generating nucleic acid aptamers: development of a DNA aptamer against α-bungarotoxin.
abstract: BACKGROUND
  Nucleic acids based therapeutic approaches have gained significant interest in recent years towards the development of therapeutics against many diseases. Recently, research on aptamers led to the marketing of Macugen®, an inhibitor of vascular endothelial growth factor (VEGF) for the treatment of age related macular degeneration (AMD). Aptamer technology may prove useful as a therapeutic alternative against an array of human maladies. Considering the increased interest in aptamer technology globally that rival antibody mediated therapeutic approaches, a simplified selection, possibly in one-step, technique is required for developing aptamers in limited time period.
  
  
  RESULTS
  Herein, we present a simple one-step selection of DNA aptamers against α-bungarotoxin. A toxin immobilized glass coverslip was subjected to nucleic acid pool binding and extensive washing followed by PCR enrichment of the selected aptamers. One round of selection successfully identified a DNA aptamer sequence with a binding affinity of 7.58 µM.
  
  
  CONCLUSIONS
  We have demonstrated a one-step method for rapid production of nucleic acid aptamers. Although the reported binding affinity is in the low micromolar range, we believe that this could be further improved by using larger targets, increasing the stringency of selection and also by combining a capillary electrophoresis separation prior to the one-step selection. Furthermore, the method presented here is a user-friendly, cheap and an easy way of deriving an aptamer unlike the time consuming conventional SELEX-based approach. The most important application of this method is that chemically-modified nucleic acid libraries can also be used for aptamer selection as it requires only one enzymatic step. This method could equally be suitable for developing RNA aptamers.
authors.affiliation: School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia.
authors.forename: Lasse H
authors.initials: LH
authors.lastname: Lauridsen
authors.forename: Hadi A
authors.initials: HA
authors.lastname: Shamaileh
authors.forename: Stacey L
authors.initials: SL
authors.lastname: Edwards
authors.forename: Elena
authors.initials: E
authors.lastname: Taran
authors.forename: Rakesh N
authors.initials: RN
authors.lastname: Veedu
mesh_terms: D052157:Aptamers, Nucleotide / Q000737:chemistry*; D001483:Base Sequence; D002038:Bungarotoxins / Q000737:chemistry*; D055767:Immobilized Proteins / Q000737:chemistry*; D016133:Polymerase Chain Reaction; D011485:Protein Binding; D052156:SELEX Aptamer Technique; D017422:Sequence Analysis, DNA
chemical_list: D052157:Aptamers, Nucleotide; D002038:Bungarotoxins; D055767:Immobilized Proteins