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Size and complexity of the nuclear genome of the ectomycorrhizal fungus Paxillus involutus.

  • Antoine Le Quéré
  • Tomas Johansson
  • Anders Tunlid
Publishing year: 2002
Language: English
Pages: 234-241
Publication/Series: Fungal Genetics and Biology
Volume: 36
Issue: 3
Document type: Journal article
Publisher: Elsevier

Abstract english

The basidiomycete Paxillus involutus is forming ectomycorrhizal symbiosis with a broad range of forest trees. Reassociation kinetics on P. involutus nuclear DNA indicated a haploid genome size of 23Mb including 11% of repetitive DNA. A similar genome size (20Mb) was estimated by genomic reconstruction analysis using three single copy genes. To assess the gene density in the P. involutus genome, a cosmid containing a 33-kb fragment of genomic DNA was sequenced and used to identify putative open reading frames (ORFs). Twelve potential ORFs were predicted, eight displayed significant sequence similarities to known proteins found in other organisms and notably, several homologues to the Podospora anserina vegetative incompatibility protein (HetE1) were found. By extrapolation, we estimate the total number of genes in the P. involutus haploid genome to approximately 7700.


  • Biological Sciences


  • Microbial Ecology
  • ISSN: 1087-1845
Anders Tunlid
E-mail: anders [dot] tunlid [at] biol [dot] lu [dot] se

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