Nuclease-resistant single-stranded DNA controls for nucleic acid amplification assays

Area of Science:

• Molecular Diagnostics
• Virology
• Biotechnology

Background:

• Polymerase Chain Reaction (PCR) and nucleic acid amplification technologies are vital for pathogen screening.
• Effective process surveillance using controls is essential for reliable molecular diagnostic test performance.
• Pathogens with single-stranded DNA genomes, such as parvovirus B19, require specific control strategies.

Purpose of the Study:

• To develop and characterize novel single-stranded DNA control constructs for molecular amplification assays.
• To evaluate the suitability of these controls for detecting single-stranded DNA viruses, exemplified by parvovirus B19.
• To assess the stability and performance of these novel controls under various conditions.

Main Methods:

• Engineering single-stranded DNA control constructs from a deletion mutant of filamentous phage fd-tet (fKN16).
• Characterizing the physical and biological properties of the control constructs, including infectivity and nuclease resistance.
• Conducting stability studies under temperature stress in different matrices (storage buffer, diluted buffer, human plasma).
• Comparing real-time amplification curves of control constructs with native parvovirus B19.

Main Results:

• fKN16-derived controls are non-infectious, highly nuclease-resistant, and easily manufactured and purified.
• The controls exhibit precise and accurate dilution capabilities.
• Demonstrated high resistance to temperature stress in various conditions.
• Recombinant control constructs containing parvovirus B19 sequences generated amplification curves comparable to native virus.

Conclusions:

• Novel, nuclease-resistant single-stranded DNA controls are feasible for molecular diagnostics.
• These phage-derived controls serve as effective surrogates for parvovirus B19 detection.
• The developed controls are applicable for routine molecular diagnostic applications, enhancing test reliability.