A Group I Intron in the 18S Ribosomal DNA from the Parasitic Fungus Isaria japonica |
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Authors: | Yuko Ito Takashi Hirano |
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Institution: | (1) Biopolymers Laboratory, Biomolecules Department, National Institute of Bioscience and Human Technology, 1-1 Higashi, Tsukuba, Ibaraki 305, Japan, JP |
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Abstract: | The nucleotide sequence of the 18S rDNA coding gene in the ascomycetes parasitic fungus Isaria japonica contains a group I intron with a length of 379 nucleotides. The identification of the DNA sequence as a group I intron is
based on its sequence homology to other fungal group I introns. Its group I intron contained the highly conserved sequence
elements P, Q, R, and S found in other group I introns. Surprisingly, the intron sequence of I. japonica is more similar to that of Ustilago maydis than to the one found in Sclerotinia sclerotiorum. This is in contrast to the sequence identity found on the neighboring rDNA. This is an interesting finding and suggests a
horizontal transfer of group I intron sequences.
Received: 19 September 1997 / Accepted: 10 September 1998 |
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Keywords: | : 18S rDNA — Group I intron — Isaria japonica— Fungal evolution |
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