An empirical approach for quantifying loop-mediated isothermal amplification (LAMP) using Escherichia coli as a model...

Area of Science:

• Molecular Biology
• Biotechnology
• Bioinformatics

Background:

• Loop-mediated isothermal amplification (LAMP) is a rapid DNA amplification method for pathogen genetic screening.
• Current limitations include the lack of quantitative models and standardized metrics for comparing LAMP results.
• The complexity of LAMP's multiple replication pathways hinders fundamental mathematical modeling.

Purpose of the Study:

• To introduce an empirical mathematical model for quantitative analysis of LAMP.
• To develop objective parameters, such as time to positive (Tp), for assessing LAMP amplification.
• To establish a standardized method for comparing LAMP results and facilitating high-throughput screening.

Main Methods:

• An empirical model was developed to extract parameters from DNA concentration versus time curves.
• A method was devised to determine the time to positive (Tp), analogous to PCR's Ct value.
• The model was applied to Escherichia coli strains using vero-toxin gene fragments, with amplicon concentrations measured by Qubit 2.0 fluorometer and data fitted to a generalized logistic function.

Main Results:

• The developed model successfully quantifies LAMP amplification, yielding objective parameters.
• Time to positive (Tp) was established as a reliable indicator of amplification.
• The model demonstrated efficacy in differentiating vero-toxin producing and non-producing E. coli strains.

Conclusions:

• This quantitative model provides objective and unambiguous indicators for LAMP amplification.
• The model facilitates standardized comparisons, simplifies data analysis, and enables statistical evaluation.
• This work represents a significant step towards automated, high-throughput screening using LAMP technology.