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G3 (Bethesda). 2013 Feb;3(2):145-52. doi: 10.1534/g3.112.003731. Epub 2013 Feb 1.

Molecular characterization of sexual diversity in a population of Serpula lacrymans, a tetrapolar basidiomycete.

Author information

1
Microbial Evolution Research Group, Department of Biology, University of Oslo, N-0316 Oslo, Norway. inger.skrede@bio.uio.no

Abstract

Different mating systems have evolved in the fungal kingdom, including a tetrapolar multiallelic mating system in many basidiomycetes. In tetrapolar species, the presence of different alleles at two mating loci (MAT A and MAT B) is necessary for mating to occur. The tetrapolar fungus Serpula lacrymans causes wood-decay in buildings in temperate regions worldwide and is present in Europe with a genetically homogeneous founder population. Using genome sequence data, we annotated the two mating type loci for S. lacrymans and found the expected synteny with other basidiomycetes, except for a retrotransposon being present in one locus (MAT A). We developed markers linked to the MAT A and MAT B regions and used these to investigate the mating type diversity in the European population. Moreover, we found a good match between the genetic markers and functional mating types as revealed by segregation and mating studies. A low diversity of mating types is present in the European S. lacrymans population caused by the founder event where a limited number of genotypes were introduced. This finding contrasts the situation in natural fungal populations where a high diversity of mating types is normally present. Although S. lacrymans has a large and viable population in Europe, we argue that the low mating type diversity restrains the dispersal and establishment of the fungus.

KEYWORDS:

dry rot; fungus; mating type; population diversity; tetrapolar

PMID:
23390592
PMCID:
PMC3564976
DOI:
10.1534/g3.112.003731
[Indexed for MEDLINE]
Free PMC Article
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