Evaluation of DNA Extraction Methods for Microbial Community Profiling in Deadwood Decomposition.

Area of Science:

• Environmental microbiology
• Mycology
• Molecular biology

Background:

• Advancing DNA sequencing technologies necessitate optimized extraction methods for complex substrates like wood.
• Wood harbors endophytic and saprotrophic fungi, presenting challenges due to cell embedment, recalcitrance, and inhibitor presence.

Purpose of the Study:

• To compare prominent DNA extraction methods for fungal genomic compounds from sound and decayed woody substrates.
• To identify the most effective and efficient method for DNA extraction from birch and pine wood for downstream sequencing.

Main Methods:

• Extraction of microbial DNA from sound and decayed birch and pine using various prominent methods, including cetyltrimethylammonium bromide and Qiagen kits.
• Assessment of DNA quantity, quality (purity and integrity), and impact on amplicon sequencing.
• Comparative analysis of extraction methods based on sequencing effectiveness, cost, and time efficiency.

Main Results:

• DNA yield varied significantly based on extraction method and wood decay stage.
• DNA quality critically influenced sample amplification and sequencing success.
• No significant extraction bias was observed in amplicon sequencing of bacterial and fungal communities.
• The Qiagen method was identified as the gold standard for woody substrates due to effectiveness, efficiency, and cost.

Conclusions:

• The Qiagen DNA extraction method is recommended as the gold standard for woody substrates.
• This study enhances confidence in existing fungal amplicon data and provides guidance for future metagenomic studies.
• A cost-benefit analysis aids in protocol selection for fungal DNA extraction from complex organic materials.