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Abstract Detail

Genetics/Molecular Biology

Nagy, Laszlo [1], Hibbett, David [1].

Insights into the evolutionary origins of the white-rot decay apparatus in Basidiomycetes.

The Basidiomycetes have evolved the most powerful enzymatic apparatus to attack wood. Recent studies suggest that white rot, i.e. the ability to break down both lignin and cellulose compounds of wood, evolved around the same time as the divergence of Agaricomycetes (mushroom-forming fungi) and Dacrymycetes (certain jelly fungi), and that lignocellulose decomposing enzymes shows a significant diversification in white rot lineages and gene loss in brown rot lineages. However, detailed genome-based analyses of the early events of the evolution of lignocellulose decomposing enzyme families have not been carried out so far. We have analyzed and reconstructed the evolutionary diversification of decay-related gene families in 62 complete genomes of fungi, with a focus on early diverging basidiomycetes in the Auriculariales, Trechisporales, Cantharellales and Dacrymycetes. Our dataset combines new whole genome sequences of  Exidia glandulosa (Auriculariales), Sistotremastrum suecicum, S. niveo-cremeum (Trechisporales), Calocera viscosa, C. cornea (Dacrymycetales), Daedalea quercina (Polyporales) with previously sequenced genomes. Our sampling covers all but four currently recognized orders of the Agaricomycetes and provides the first opportunity to evaluate the phylogenetic position of the Trechisporales and the relationships between early-diverging basidiomycete orders using phylogenomic datasets. We assembled multigene datasets from gene families without deep paralogs, resulting combined alignments with 665 to 811 genes. We are analyzing the phylogenetic relationships within decay-related gene families and perform gene tree – species tree reconciliations to reconstruct the dynamics of copy-number evolution in these gene families and localize the the expansion of white-rot related enzymes to the species phylogeny using genomic methods.

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1 - Clark University, Biology Department, 950 Main street, Worcester, MA, 01610, USA

wood decay
comparative genomics

Presentation Type: Offered Paper - Paper
Session: 4
Location: Auditorium/Kellogg Hotel and Conference Center
Date: Monday, June 9th, 2014
Time: 1:45 PM
Number: 4004
Abstract ID:108
Candidate for Awards:None

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