Gene organization of the mating type regions in the ectomycorrhizal fungus Laccaria bicolor reveals distinct evolution between the two mating type loci

Détails

ID Serval
serval:BIB_5E4DDE95D17C
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Gene organization of the mating type regions in the ectomycorrhizal fungus Laccaria bicolor reveals distinct evolution between the two mating type loci
Périodique
New Phytologist
Auteur(s)
Niculita-Hirzel Hélène, Labbé J., Kohler A., le Tacon F., Martin F., Sanders I.R., Kües U.
ISSN
1469-8137[electronic], 0028-646X[linking]
Statut éditorial
Publié
Date de publication
2008
Volume
180
Numéro
2
Pages
329-342
Langue
anglais
Résumé
In natural conditions, basidiomycete ectomycorrhizal fungi such as Laccaria bicolor are typically in the dikaryotic state when forming symbioses with trees, meaning that two genetically different individuals have to fuse or 'mate'. Nevertheless, nothing is known about the molecular mechanisms of mating in these ecologically important fungi. Here, advantage was taken of the first sequenced genome of the ectomycorrhizal fungus, Laccaria bicolor, to determine the genes that govern the establishment of cell-type identity and orchestrate mating. The L. bicolor mating type loci were identified through genomic screening. The evolutionary history of the genomic regions that contained them was determined by genome-wide comparison of L. bicolor sequences with those of known tetrapolar and bipolar basidiomycete species, and by phylogenetic reconstruction of gene family history. It is shown that the genes of the two mating type loci, A and B, are conserved across the Agaricales, but they are contained in regions of the genome with different evolutionary histories. The A locus is in a region where the gene order is under strong selection across the Agaricales. By contrast, the B locus is in a region where the gene order is likely under a low selection pressure but where gene duplication, translocation and transposon insertion are frequent.
Mots-clé
Basidiomycota/genetics, DNA, Fungal, Evolution, Molecular, Genes, Mating Type, Fungal, Genome, Fungal, Laccaria/genetics, Mycorrhizae/genetics, Plectin/genetics, Recombination, Genetic, Reproduction/genetics
Pubmed
Web of science
Création de la notice
25/04/2008 12:41
Dernière modification de la notice
20/08/2019 15:16
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