The sporadic occurrence of a group I intron-like element in the mtDNA rnl gene of Ophiostoma novo-ulmi subsp. americana

Mycological Research
Jyothi SethuramanG Hausner

Abstract

The presence of group I intron-like elements within the U7 region of the mtDNA large ribosomal subunit RNA gene (rnl) was investigated in strains of Ophiostoma novo-ulmi subsp. americana from Canada, Europe and Eurasia, and in selected strains of O. ips, O. minus, O. piceae, O. ulmi, and O. himal-ulmi. This insertion is of interest as it has been linked previously to the generation of plasmid-like mtDNA elements in diseased strains of O. novo-ulmi. Among 197 O. novo-ulmi subsp. americana strains tested, 61 contained a 1.6kb insertion within the rnl-U7 region and DNA sequence analysis suggests the presence of a group I intron (IA1 type) that encodes a potential double motif LAGLIDADG homing endonuclease-like gene (HEG). Phylogenetic analysis of rnl-U7 intron encoded HEG-like elements supports the view that double motif HEGs originated from a duplication event of a single-motif HEG followed by a fusion event that combined the two copies into one open reading frame (ORF). The data also show that rnl-U7 intron encoded ORFs belong to a clade that includes ORFs inserted into different types of group I introns, e.g. IB, ID, IC3, IA1, present within a variety of different mtDNA genes, such as the small ribosomal subunit RNA gene (rns),...Continue Reading

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Citations

Feb 6, 2018·Canadian Journal of Microbiology·Talal George AbboudGeorg Hausner
Nov 22, 2017·Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis·Tuhin K GuhaGeorg Hausner
Jun 22, 2021·Frontiers in Microbiology·Chase G MayersGeorg Hausner
Jul 18, 2009·Fungal Genetics and Biology : FG & B·Claudia B Monteiro-VitorelloHelmut Bertrand
May 31, 2011·Fungal Genetics and Biology : FG & B·Dipnath BaidyaroyHelmut Bertrand

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