PMID: 9418260Aug 1, 1997Paper

A phylogenetic analysis of three group I introns found in the nuclear small subunit ribosomal RNA gene of the ballistoconidiogenous anamorphic yeast-like fungus Tilletiopsis flava

Genes & Genetic Systems
M Takashima, T Nakase

Abstract

There are three group I introns in the nuclear small subunit ribosomal RNA gene (SSU rDNA) of the ballistoconidiogenous anamorphic yeast-like fungus Tilletiopsis flava JCM 5186. The size of these sequences were 325 nt (position 516), 335 nt (position 1199) and 437 nt (position 1506), respectively. The introns at position 516 (T.flav516) and position 1199 (T.flav1199) belonged to subgroup IB3, and that of position 1506 (T.flav1506) belonged to subgroup IC1. The results of comparison with other group I introns found in SSU rDNA of eucaryotes showed that the positions 516 and 1199 were common positions to IB3 group I introns of fungi and green algae, and that positions 943, 1506 and 1512 were those to IC1 group I introns of fungi, and green and red algae. It is indicated that the insertion position of introns have close relationship with the nature of the subgroup to which they belonged. For phylogenetic analysis, we employed 9 IB3 introns, in which 7 were at position 516 and 2 were at position 1199, and 25 IC1 introns. The maximum likelihood tree based on the conserved region alignment showed that group I introns of subgroup IB3 were phylogenetically distant from those of subgroup IC1. T.flav516 (basidiomycete) constituted a subc...Continue Reading

References

Nov 20, 1992·Journal of Molecular Biology·P T DePriest, M D Been
Jul 11, 1989·Nucleic Acids Research·M L Sogin, J C Edman
Sep 25, 1987·Nucleic Acids Research·J M BurkeH F Tabak
May 1, 1994·Nature Structural Biology·T R CechR R Gutell
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Oct 11, 1994·Proceedings of the National Academy of Sciences of the United States of America·D BhattacharyaM Melkonian
Jul 11, 1994·Nucleic Acids Research·T YamadaP Songsri

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