Abstract
The complete mitochondrial genome of the ascomycete Pyronema confluens has been sequenced. The circular genome has a size of 191 kb and contains 48 protein-coding genes, 26 tRNA genes, and two rRNA genes. Of the protein-coding genes, 14 encode conserved mitochondrial proteins, and 31 encode predicted homing endonuclease genes.
Highlights
Fungal mitochondrial genomes vary greatly in size, ranging from 19 to Ͼ200 kb [1,2,3]
For the Pezizomycetes, an early diverging group of filamentous ascomycetes, no mitochondrial genomes have been described; it is not clear whether the trend of genome expansion was already present in the last common ancestor of the Pezizomycotina
The mitochondrial genome of the pezizomycete Pyronema confluens was sequenced to learn more about mitochondrial genome size and structure in early diverging filamentous ascomycetes
Summary
Fungal mitochondrial genomes vary greatly in size, ranging from 19 to Ͼ200 kb [1,2,3]. They usually contain 14 genes encoding conserved proteins for oxidative phosphorylation [4]; the number of additional genes varies greatly between species. In ascomycetes, sequenced mitochondrial genomes from the Taphrinomycotina and Saccharomycotina are Ͻ100 kb in size [5,6,7,8], whereas among the Pezizomycotina (filamentous ascomycetes), mitochondrial genomes can exceed 200 kb, mostly through enlargement of intronic and intergenic regions [1, 9].
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