4.3 Article

Identification of group I introns within the SSU rDNA gene in species of Ceratocystiopsis and related taxa

Journal

FUNGAL BIOLOGY
Volume 116, Issue 1, Pages 98-111

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.funbio.2011.10.005

Keywords

Blue-stain fungi; Concerted evolution; Nuclear group I introns; rDNA

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Funding

  1. Natural Sciences and Engineering Research Council of Canada (NSERC)
  2. NSERC Chair
  3. Egyptian Ministry of Higher Education and Scientific Research

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During a recent phylogenetic study, group I introns were noted that interrupt the nuclear small subunit ribosomal RNA (SSU rDNA) gene in species of Ceratocystiopsis. Group I introns were found to be inserted at the following rDNA positions: S943, 5989, and S1199. The introns have been characterized and phylogenetic analysis of the host gene and the corresponding intron data suggest that for S943 vertical transfer and frequent loss appear to be the most parsimonious explanation for the distribution of nuclear SSU rDNA introns among species of Ceratocystiopsis. The SSU rDNA data do suggest that a recent proposal of segregating the genus Ophiostoma sensu lato into Ophiostoma sensu stricto, Grosmannia, and Ceratocystiopsis has some merit but may need further amendments, as the SSU rDNA suggests that Ophiostoma s. str. may now represent a paraphyletic grouping. (C) 2011 British Mycological Society. Published by Elsevier Ltd. All rights reserved.

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