Comparison of different protocols for DNA preparation and PCR for the detection of fungal pathogens in vitro
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Published on: May 27, 2022
R Lugert1, C Schettler, U Gross
1National Reference Center for Systemic Mycoses, Institute of Medical Microbiology, University of Göttingen, Germany. rlugert@gwdg.de
Abstract:
Although a large number of different PCR protocols for the detection of fungal DNA from clinical samples have been described, a generally recognised standardisation has not yet been developed. In a first step, we compared six different methods to isolate DNA under in vitro conditions from Aspergillus fumigatus, Candida albicans and Saccharomyces cerevisiae with respect to efficiency and expenditure of time. To this end, methods were tested that are based on both mechanical and enzymatic/thermic lysis. Thereby, enzymatic/thermic lysis were shown to be superior to mechanical lysis, although these methods of DNA isolation were more time consuming. The subsequent comparison of three different PCR protocols showed real-time PCR to be the most sensitive method.
Insights
Standardizing fungal DNA detection is crucial. Enzymatic/thermic lysis methods are superior for DNA isolation, and real-time PCR offers the highest sensitivity for detecting fungal DNA in clinical samples.
Area of Science:
- Mycology
- Molecular Biology
- Clinical Diagnostics
Background:
- Standardization of Polymerase Chain Reaction (PCR) protocols for fungal DNA detection from clinical samples remains a challenge.
- Various DNA isolation methods and PCR techniques exist, but a universally accepted standard is lacking.
Purpose of the Study:
- To compare the efficiency and time expenditure of different DNA isolation methods for fungal pathogens.
- To evaluate the sensitivity of various PCR protocols for fungal DNA detection.
Main Methods:
- Six DNA isolation methods (mechanical vs. enzymatic/thermic lysis) were tested in vitro using Aspergillus fumigatus, Candida albicans, and Saccharomyces cerevisiae.
- Three different PCR protocols were compared for their sensitivity in detecting fungal DNA.
Main Results:
- Enzymatic/thermic lysis methods demonstrated superior efficiency for DNA isolation compared to mechanical lysis.
- Despite being more time-consuming, enzymatic/thermic lysis yielded better results.
- Real-time PCR was identified as the most sensitive method among the tested PCR protocols.
Conclusions:
- Enzymatic/thermic lysis is recommended for fungal DNA isolation from clinical samples due to its higher efficiency.
- Real-time PCR provides the most sensitive detection of fungal DNA, crucial for accurate clinical diagnostics.
