PMID: 9169556Jun 1, 1997Paper

Origin and inheritance of group I introns in 26S rRNA genes of Gaeumannomyces graminis

Journal of Molecular Evolution
M K Tan

Abstract

Studies of the distribution of the three group I introns (intron A, intron T, and intron AT) in the 26S rDNA of Gaeumannomyces graminis had suggested that they were transferred to a common ancestor of G. graminis var. avenae and var. tritici after it had branched off from var. graminis. Intron AT and intron A exhibited vertical inheritance and coevolved in concert with their hosts. Intron loss could occur after its acquisition. Loss of any one of the three introns could occur in var. tritici whereas only loss of intron T had been found in the majority of var. avenae isolates. The existence of isolates of var. tritici and var. avenae with three introns suggested that intron loss could be reversed by intron acquisition and that the whole process is a dynamic one. This process of intron acquisition and intron loss reached different equilibrium points for different varieties and subgroups, which explained the irregular distribution of these introns in G. graminis. Each of the three group I introns was more closely related to other intron sequences that share the same insertion point in the 26S rDNA than to each other. These introns in distantly related organisms appeared to have a common ancestry. This system had provided a good mo...Continue Reading

Citations

Oct 9, 2002·Journal of Molecular Biology·Scott JacksonSarah Woodson
Nov 10, 2001·Annual Review of Phytopathology·U Liane Rosewich, H Corby Kistler
Jul 1, 2004·Molecular Plant Pathology·Jacqueline Freeman, Elaine Ward
Mar 13, 2014·Mobile DNA·Georg HausnerDavid R Edgell
Aug 10, 2016·Studies in Mycology·M Hernández-RestrepoP W Crous
Nov 26, 1998·The Journal of Biological Chemistry·S DewildeL Moens

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