Inhibition of nonspecific polymerase activity using Poly(Aspartic) acid as a model anionic polyelectrolyte.
Anal Biochem
; 628: 114267, 2021 09 01.
Article
in English
| MEDLINE | ID: covidwho-1252363
ABSTRACT
DNA polymerases with strand-displacement activity allow to amplify nucleic acids under isothermal conditions but often lead to undesirable by-products. Here, we report the increase of specificity of isothermal amplification in the presence of poly (aspartic) acids (pAsp). We hypothesized that side reactions occur due to the binding of the phosphate backbone of synthesized DNA strands with surface amino groups of the polymerase, and weakly acidic polyelectrolytes could shield polymerase molecules from DNA and thereby inhibit nonspecific amplification. Suppression of nonspecific polymerase activity by pAsp was studied on multimerization as a model side reaction. It was found that a low concentration of pAsp (0.01%) provides successful amplification of specific DNA targets. The inhibitory effect of pAsp is due to its polymeric structure since aspartic acid did affect neither specific nor nonspecific amplification. Strongly acidic polyelectrolyte heparin does not possess the same selectivity since it suppresses any DNA synthesis. The applicability of pAsp to prevent nonspecific reactions and reliable detection of the specific target has been demonstrated on the genetic material of SARS-CoV-2 coronavirus using Loop-mediated isothermal amplification.
Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Peptides
/
Nucleic Acid Amplification Techniques
/
Molecular Diagnostic Techniques
/
DNA-Directed DNA Polymerase
/
COVID-19 Nucleic Acid Testing
/
SARS-CoV-2
/
COVID-19
Type of study:
Diagnostic study
/
Experimental Studies
/
Randomized controlled trials
Limits:
Humans
Language:
English
Journal:
Anal Biochem
Year:
2021
Document Type:
Article
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