Complete mitochondrial genome of the ectomycorrhizal fungus Tricholoma matsutake

Tricholoma matsutake is an ectomycorrhizal fungus belonging to the class Agaricomycetes and the phylum Basidiomycota. Here, we report the complete mitochondrial genome sequence of T. matsutake. The mitochondrial DNA (mtDNA) of T. matsutake seems to be concatenated, and harbors 76,037 nucleotides, with an overall GC content of 20.69%. The mtDNA comprises 15 protein-coding genes, 28 tRNA genes, and 2 rRNA genes. A comparative mitogenomic analysis between Agaricomycetes and other classes (Exobasidiomycetes, Pucciniomycetes, Tremellomycetes, and Ustilaginomycetes) revealed that species belonging to the class Agaricomycetes preferably harbor the codon UUA (coding for leucine) in their mtDNAs, whereas other classes prefer the codon CUA. This bias in the usage of the leucine codon could be the result of evolutionary divergence between the Agaricomycetes and other classes. The T. matsutake mtDNA sequence thus provides insight into the evolutionary characteristics of the Agaricomycetes mtDNAs.