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United States Department of Agriculture

Agricultural Research Service

Research Project: Genomic Analyses and Management of Agricultural and Industrial Microbial Genetic Resources and Associated Information

Location: Bacterial Foodborne Pathogens & Mycology Research Unit

Title: Evolutionary history of Ascomyceteous Yeasts

Authors
item Haridas, Sajeet -
item Riley, Robert -
item Salamov, Asaf -
item Kurtzman, Cletus
item Blackwell, Meredith -
item Jeffries, Thomas -
item Gregoriev, Igor -

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: June 12, 2014
Publication Date: June 12, 2014
Citation: Haridas, S., Riley, R., Salamov, A., Kurtzman, C.P., Blackwell, M., Jeffries, T.W., Gregoriev, I. 2014. Evolutionary history of Ascomyceteous Yeasts [abstract]. Mycological Society of America.

Technical Abstract: Yeasts are important for many industrial and biotechnological processes and show remarkable diversity despite morphological similarities. We have sequenced the genomes of 20 ascomyceteous yeasts of taxonomic and industrial importance including members of Saccharomycotina and Taphrinomycotina. A comparison of these with several other previously published yeast genomes has helped resolve the phylogenetic positions of previously poorly placed species including Saitoella complicata, Babjeviella inositovora, and Metschnikowia bicuspidata. Phylogenetic analysis showed that alternative yeast nuclear codon usage, where CUG encodes serine instead of leucine, is monophyletic within a clade of the Saccharomycotina. Most of the yeasts have compact genomes with a large fraction of single exon genes with Lipomyces starkeyi and the previously published Pneumocystis jirovecii being notable exceptions. Early diverging species appear to have more introns. We also observed a large number of unclassified lineage-specific non-simple repeats in these genomes.

Last Modified: 9/2/2014
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