High variability in a mating type linked region in the dry rot fungus Serpula lacrymans caused by frequency-dependent selection?

BMC Genetics
Ingeborg B EnghHåvard Kauserud

Abstract

The mating type loci that govern the mating process in fungi are thought to be influenced by negative frequency-dependent selection due to rare allele advantage. In this study we used a mating type linked DNA marker as a proxy to indirectly study the allelic richness and geographic distribution of mating types of one mating type locus (MAT A) in worldwide populations of the dry rot fungus Serpula lacrymans. This fungus, which causes serious destruction to wooden constructions in temperate regions worldwide, has recently expanded its geographic range with a concomitant genetic bottleneck. High allelic richness and molecular variation was detected in the mating type linked marker as compared to other presumably neutral markers. Comparable amounts of genetic variation appeared in the mating type linked marker in populations from nature and buildings, which contrast the pattern observed with neutral genetic markers where natural populations were far more variable. Some geographic structuring of the allelic variation in the mating type linked marker appeared, but far less than that observed with neutral markers. In founder populations of S. lacrymans, alleles co-occurring in heterokaryotic individuals were more divergent than expect...Continue Reading

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Citations

Jul 3, 2013·Fungal Biology·Magriet A van der NestBernard Slippers
Jul 19, 2013·Molecular Biology and Evolution·Linda T A van DiepenTimothy Y James
Sep 16, 2011·Advances in Dental Research·B J BaumJ E Melvin
Feb 8, 2013·G3 : Genes - Genomes - Genetics·Inger SkredeHåvard Kauserud

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Methods Mentioned

BETA
PCR

Software Mentioned

R
DnaSP
BioEdit
MrBayes
MrModeltest
HKA
TNT

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