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Pubmed ID :29596959
Publication Date : //

Two efficient methods for isolation of high-quality genomic DNA from entomopathogenic fungi.


Conventional and commercial methods for isolation of nucleic acids are available for fungal samples including entomopathogenic fungi (EPF). However, there is not a unique optimal method for all organisms. The cell wall structure and the wide range of secondary metabolites of EPF can broadly interfere with the efficiency of the DNA extraction protocol. This study compares three commercial protocols: DNeasy® Plant Mini Kit (Qiagen), Wizard® Genomic DNA Purification Kit (Promega), and Axygen™ Multisource Genomic DNA Miniprep Kit (Axygen) and three conventional methods based on different buffers: SDS, CTAB/PVPP, and CTAB/β-mercaptoethanol versus three cell lysis procedures: liquid nitrogen homogenization and two bead-beating materials (i.e., tungsten-carbide and stainless-steel) for four representative species of EPF (i.e., Beauveria bassiana, Hirsutella citriformis, Isaria javanica, and Metarhizium anisopliae). Liquid nitrogen homogenization combined with DNeasy® Plant Mini Kit (i.e., QN) or SDS buffer (i.e., SN) significantly improved the yield with a good purity (~1.8) and high integrity (>20,000 bp) of genomic DNA in contrast with other methods, also, these results were better when compared with the two bead-beating materials. The purified DNA was evaluated by PCR-based techniques: amplification of translation elongation factor 1-α (TEF) and two highly sensitive molecular markers (i.e., ISSR and AFLP) with reliable and reproducible results. Despite a variation in yield, purity, and integrity of extracted DNA across the four species of EPF with the different DNA extraction methods, the SN and QN protocols maintained a high-quality of DNA which is required for downstream molecular applications.

Authors : Serna-Domínguez María G , Andrade-Michel Gilda Y , Arredondo-Bernal Hugo C , Gallou Adrien ,

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