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Molecular Biology and Evolution 19:2022-2025 (2002)
© 2002 Society for Molecular Biology and Evolution

Group-I Intron Containing a Putative Homing Endonuclease Gene in the Small Subunit Ribosomal DNA of Beauveria bassiana IFO 31676

Eiji Yokoyama*, Kenzo Yamagishi{dagger} and Akira Hara{ddagger}

*The Agricultural High-Tech Research Center,
{dagger}Laboratory of Entomology,
{ddagger}Laboratory of Biological Chemistry, Meijo University, Tempaku-ku, Nagoya 468-8502, Japan

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Group-I introns have been identified in the organellar and nuclear genomes of higher plants, fungi, amoebae, green algae, and archaea, and in the genomes of viruses and phages. This wide distribution and phylogenetically sporadic existence of group-I introns has led to the hypothesis of horizontal transfer. In the pyrenomycete fungi, Nikoh and Fukatsu (2001)Citation supposed that the common ancestor of Cordyceps prolifica and C. kanzashiana horizontally gained group-I introns of ribosomal DNA (rDNA) from distantly related fungi. An interkingdom transfer of group-I introns of rDNA between a plant, Youngia japonica, and a phytopathogenic fungus, Protomyces inouei, was also proposed by Nishida and Sugiyama (1995)Citation . Although the intron mobility of nuclear rDNA is widely accepted, few intron-encoded endonucleases are known. Because of the lack of the endonuclease gene, except for the cases of Nectria galligena (Johansen and Haugen 1999Citation ) and the ericoid fungal isolates (Perotto et al. . . . [Full Text of this Article]


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