Computational Biology
@ Comenius University in Bratislava

Eva Hegedusova, Brona Brejova, Lubomir Tomaska, Matthias Sipiczki, Jozef Nosek. Mitochondrial genome of the basidiomycetous yeast Jaminaea angkorensis. Current Genetics, 60(1):49-59. 2014.

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Download from publisher: http://link.springer.com/article/10.1007/s00294-013-0410-1

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Abstract:

Jaminaea angkorensis is an anamorphic basidiomycetous yeast species originally
isolated from decaying leaves in Cambodia. Taxonomically, J. angkorensis is
affiliated with Microstromatales (Exobasidiomycetes, Ustilaginomycotina,
Basidiomycota) and represents a basal phylogenetic lineage of this fungal order. 
To perform a comparative analysis of J. angkorensis with other basidiomycetes, we
determined and analyzed its complete mitochondrial DNA sequence. The
mitochondrial genome is represented by 29,999 base pairs long, circular DNA
containing 32 % guanine and cytosine residues. Its genetic organization is
relatively compact and comprises typical genes for 15 conserved proteins involved
in oxidative phosphorylation (atp6, 8, and 9; cob; cox1, 2, and 3; and nad1, 2,
3, 4, 4L, 5, and 6) and translation (rps3), two ribosomal RNAs (rnl and rns) and 
twenty-two transfer RNAs (trnA-Y). Although the gene content is similar to other 
basidiomycetes, the gene orders in the examined species exhibit only a limited
synteny, reflecting their phylogenetic distances and extensive genome
rearrangements. In addition, a comparative analysis of basidiomycete
mitochondrial genomes indicates that stop-to-tryptophan reassignment of the UGA
codon was accompanied by structural alterations of tRNA-Trp(CCA). These results
provide an insight into the evolution of the genetic code in fungal mitochondria.