Contigs from a de novo genomic assembly in CLC Genomics Workbench (v9; Qiagen, Redwood City, CA) were identified as mitochondrial due to sequence similarity with P. tabacina mitochondrial sequences (KT893455) by BLAST analysis (Derevnina et al. 2015 (link)). These were used as templates for further assembly with SeqMan NGen (v16.0.0, DNASTAR, Madison, WI, USA). The resulting assemblies were evaluated for uniformity and depth of coverage. Contigs were broken when gaps/low coverage or inconsistencies were observed and the set of smaller contigs reassembled using the reference-guided assembly—special workflows assembly option of SeqMan NGen to extend the ends of the contigs and close the gaps. Open reading frames (ORFs) were predicted and annotated with Geneious v9.1.8 (Biomatters, New Zealand) using the universal genetic code. Encoded products of genes were identified using BLAST (Altschul et al. 1990 (link)) analysis against mitochondrial genome sequences published for Peronospora tabacina (Derevnina et al. 2015 (link)). Genes encoding tRNAs were identified using tRNAscan-SE v1.3.1 (Lowe and Eddy 1997 (link)).
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