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DETECTION OF A GROUP I (IE) FUNGAL INTRON IN THE GREEN ALGAL GENUS UROSPORA (ULVOPHYCEAE) 1
Author(s) -
Lindstrom Sandra C.,
Pistolic Jelena
Publication year - 2005
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.2005.04116.x
Subject(s) - intron , biology , group i catalytic intron , 18s ribosomal rna , genetics , gene , rna splicing , phylogenetic tree , rna
A group IE intron at position 989 ( Escherichia coli numbering) in the 18S rRNA gene is described for the first time from the green algae based on primary and secondary structure analysis of the intron. The intron occurred in Urospora neglecta Kornmann, U. wormskioldii (Mertens) Rosenvinge, and in an undescribed taxon closely allied with U. wormskioldii . The Urospora intron was 397 or 399 bp in length, except for one variant, which was 652 bp in length. The latter intron appeared to be a chimera, consisting of a conspecific part, a segment more closely related to another species, and a region of unknown origin. A search of data bases containing introns indicated that the green algal intron is homologous with other 989 introns, all occurring in fungi, which may be the source of the Urospora intron. The introduction of this intron into the Urospora lineage has occurred within the last 14 million years, based on estimates of the earliest divergence of the genus from other members of the family Acrosiphoniaceae, all of which lack 18S introns.