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Open AccessArticle

Genomic Evidence of Recombination in the Basidiomycete Wallemia mellicola

by Xiaohuan Sun 1,2,†, Cene Gostinčar 3,4,*,†, Chao Fang 1,2, Janja Zajc 3,5, Yong Hou 1,2, Zewei Song 1,2,‡ and Nina Gunde-Cimerman 3,‡
China National GeneBank, BGI-Shenzhen, Jinsha Road, Shenzhen 518120, China
BGI-Shenzhen, Beishan Industrial Zone, Shenzhen 518083, China
Department of Biology, Biotechnical Faculty, University of Ljubljana, 1000 Ljubljana, Slovenia
Lars Bolund Institute of Regenerative Medicine, BGI-Qingdao, Qingdao 266555, China
Department of Biotechnology and Systems biology, National Institute of Biology, 1000 Ljubljana, Slovenia
Author to whom correspondence should be addressed.
These authors contributed equally to this work as first authors.
These authors contributed equally to this work.
Genes 2019, 10(6), 427;
Received: 25 April 2019 / Revised: 28 May 2019 / Accepted: 30 May 2019 / Published: 4 June 2019
(This article belongs to the Special Issue Genetics of Halophilic Microorganisms)
One of the most commonly encountered species in the small basidiomycetous sub-phylum Wallemiomycotina is Wallemia mellicola, a xerotolerant fungus with a widespread distribution. To investigate the population characteristics of the species, whole genomes of twenty-five strains were sequenced. Apart from identification of four strains of clonal origin, the distances between the genomes failed to reflect either the isolation habitat of the strains or their geographical origin. Strains from different parts of the world appeared to represent a relatively homogenous and widespread population. The lack of concordance between individual gene phylogenies and the decay of linkage disequilibrium indicated that W. mellicola is at least occasionally recombining. Two versions of a putative mating-type locus have been found in all sequenced genomes, each present in approximately half of the strains. W. mellicola thus appears to be capable of (sexual) recombination and shows no signs of allopatric speciation or specialization to specific habitats. View Full-Text
Keywords: population genomics; halotolerance; xerotolerance; basidiomycete; allergenic fungus; recombination population genomics; halotolerance; xerotolerance; basidiomycete; allergenic fungus; recombination
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Sun, X.; Gostinčar, C.; Fang, C.; Zajc, J.; Hou, Y.; Song, Z.; Gunde-Cimerman, N. Genomic Evidence of Recombination in the Basidiomycete Wallemia mellicola. Genes 2019, 10, 427.

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