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Detection of signal recognition particle (SRP) RNAs in the nuclear ribosomal internal transcribed spacer 1 (ITS1) of three lineages of ectomycorrhizal fungi (Agaricomycetes, Basidiomycota)

Journal article
Authors Magnus Alm Rosenblad
María P. Martín
Leho Tedersoo
Martin K. Ryberg
Ellen Larsson
Christian Wurzbacher
Kessy Abarenkov
R. Henrik Nilsson
Published in MycoKeys
Volume 13
Pages 21-33
ISSN 1314-4057
Publication year 2016
Published at Department of marine sciences
Department of Biological and Environmental Sciences
Pages 21-33
Language en
Keywords SRP RNA, non-coding RNA, ribosomal RNA, internal transcribed spacer 1 (ITS1), ectomycorrhizal fungi
Subject categories Structural Biology, Biochemistry and Molecular Biology, Botany, Genetics, Bioinformatics and Systems Biology, Biological Systematics, Evolutionary Biology, Functional genomics


During a routine scan for Signal Recognition Particle (SRP) RNAs in eukaryotic sequences, we surprisingly found in silico evidence in GenBank for a 265-base long SRP RNA sequence in the ITS1 region of a total of 11 fully identified species in three ectomycorrhizal genera of the Basidiomycota (Fungi): Astraeus, Russula, and Lactarius. To rule out sequence artifacts, one specimen from a species indicated to have the SRP RNA-containing ITS region in each of these genera was ordered and re-sequenced. Sequences identical to the corresponding GenBank entries were recovered, or in the case of a non-original but conspecific specimen differed by three bases, showing that these species indeed have an SRP RNA sequence incorporated into their ITS1 region. Other than the ribosomal genes, this is the first known case of non-coding RNAs in the eukaryotic ITS region, and it may assist in the examination of other types of insertions in fungal genomes.

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