Metagenomic DNA extraction was then performed on the frozen pellets via chemical and mechanical lysis using a Pathogen Lysis Tube S and QIAamp UCP Pathogen Mini Kit (Qiagen, Hilden, Germany) [22 (link),23 ,69 ]. Subsequently, quantification of the purified genomic DNA was performed using a Quantus fluorometer (Promega, Madison, WI, USA) and Qubit dsDNA BR Assay Kit (Thermo Fisher Scientific, Waltham, MA, USA). The quantified DNA was frozen at −80 °C until use.
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