Molecular Biology and Evolution, Vol 12, 208-218, Copyright © 1995 by Society for Molecular Biology and Evolution
A Gargas, PT DePriest and JW Taylor
Lichen-forming fungi, in symbiotic associations with algae, frequently have
nuclear small subunit ribosomal DNA (SSU rDNA) longer than the 1,800
nucleotides typical for eukaryotes. The lichen-forming ascomycetous fungus
Lecanora dispersa contains insertions at eight distinct positions of its
SSU rDNA; the lichen-forming fungi Calicium tricolor and Porpidia
crustulata each contain one insertion. Insertions are not limited to fungi
that form lichens; the lichen ally Mycocalicium albonigrum also contains
two insertions. Of the 11 insertion positions now reported for
lichen-forming fungi and this ally, 6 positions are known only from
lichen-forming fungi. Including the 4 newly reported in this study,
insertions are now known from at least 17 positions among all reported SSU
rDNA sequences. Insertions, most of which are Group I introns, are reported
in fungal and protistan lineages and occur at corresponding positions in
genomes as phylogenetically distant as the nuclei of fungi, green algae,
and red algae. Many of these positions are exposed in the mature rRNA
tertiary structure and may be subject to independent insertion of introns.
Insertion of introns, accompanied by their sporadic loss, accounts for the
scattered distribution of insertions observed within the SSU rDNA of these
diverse organisms.
ORIGINAL ARTICLE
Positions of multiple insertions in SSU rDNA of lichen-forming fungi
Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington, D.C. 20560.
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