Sensitive detection of abasic sites in double-stranded DNA based on the selective reaction of enzymes.
Anal Chim Acta
; 1223: 340220, 2022 Aug 29.
Article
em En
| MEDLINE
| ID: mdl-35999006
ABSTRACT
The apurinic/apyrimidinic (AP) site is one of the most common DNA lesions and a critical intermediate during the base excision repair pathway. Therefore, AP sites are essential in clinical diagnosis, treatment and detection. However, the existing detection methods are complicated in design and synthesis and have high instrument requirements, limiting their wide application. Therefore, there is an urgent need for a sensitive and straightforward detection method without time-consuming and heterogeneous reactions. Herein, we developed two compatible detection methods for AP sites in long and short dsDNA. For long and short dsDNA, the background signal was successfully suppressed by the affinity difference of Terminal deoxynucleotidyl transferase (TdT) and 3' -end blocking, respectively, thus achieving high detectability and specificity. The detection limit was 13 pM in 20 µL, meaning that the LOD was 0.26 fmol for AP site amount and 0.05% for AP site abundance. The method has been successfully applied to detect AP sites in various biological samples quickly. Therefore, it has broad clinical application prospects, catering for the need for a point of care.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
DNA Liase (Sítios Apurínicos ou Apirimidínicos)
/
Reparo do DNA
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article