The electroactivity of purine and pyrimidine bases is the most important property of nucleic acids that is very useful for determining oligonucleotides using square wave voltammetry. This study was focused on the electrochemical behavior of adenine-containing oligonucleotides before and after their isolation using paramagnetic particles. Two peaks were detected-peak A related to the reduction of adenine base and another peak B involved in the interactions between individual adenine strands and contributes to the formation of various spatial structures. The influence of the number of adenine bases in the strand in the isolation process using paramagnetic particles was investigated too.

• Keywords
• adenine, adenine interaction, aptamer, biosensor, magnetic beads, nanobiotechnology, square wave voltammetry,
• Publication type
• Journal Article MeSH

Since its first official detection in the Guangdong province of China in 1996, the highly pathogenic avian influenza virus of H5N1 subtype (HPAI H5N1) has reportedly been the cause of outbreaks in birds in more than 60 countries, 24 of which were European. The main issue is still to develop effective antiviral drugs. In this case, single point mutation in the neuraminidase gene, which causes resistance to antiviral drug and is, therefore, subjected to many studies including ours, was observed. In this study, we developed magnetic electrochemical bar code array for detection of single point mutations (mismatches in up to four nucleotides) in H5N1 neuraminidase gene. Paramagnetic particles Dynabeads® with covalently bound oligo (dT)₂₅ were used as a tool for isolation of complementary H5N1 chains (H5N1 Zhejin, China and Aichi). For detection of H5N1 chains, oligonucleotide chains of lengths of 12 (+5 adenine) or 28 (+5 adenine) bp labeled with quantum dots (CdS, ZnS and/or PbS) were used. Individual probes hybridized to target molecules specifically with efficiency higher than 60%. The obtained signals identified mutations present in the sequence. Suggested experimental procedure allows obtaining further information from the redox signals of nucleic acids. Moreover, the used biosensor exhibits sequence specificity and low limits of detection of subnanogram quantities of target nucleic acids.

• MeSH
• Point Mutation * MeSH
• Electrochemical Techniques methods   MeSH
• Humans MeSH
• Magnetics methods   MeSH
• Mutant Proteins genetics   MeSH
• Neuraminidase genetics   MeSH
• DNA Barcoding, Taxonomic methods   MeSH
• Virology methods   MeSH
• Drug Resistance, Viral MeSH
• Viral Proteins genetics   MeSH
• Influenza A Virus, H5N1 Subtype classification   enzymology   genetics   MeSH
• Animals MeSH
• Check Tag
• Humans MeSH
• Animals MeSH
• Publication type
• Journal Article MeSH
• Geographicals
• China MeSH
• Names of Substances
• Mutant Proteins MeSH
• NA protein, influenza A virus MeSH Browser
• Neuraminidase MeSH
• Viral Proteins MeSH