Reference: Trinkl H and Wolf K (1986) The mosaic cox1 gene in the mitochondrial genome of Schizosaccharomyces pombe: minimal structural requirements and evolution of group I introns. Gene 45(3):289-97

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Abstract


The gene encoding subunit 1 of cytochrome oxidase (cox1) in the fission yeast Schizosaccharomyces pombe is polymorphic. In strain 50 it contains two group I introns with open reading frames (ORFs) in phase with the upstream exons (Lang, 1984). In strain EF1 two additional very short group I introns which do not possess ORFs were detected by DNA sequencing. These two introns (AI2a and AI3) share distinct characteristics concerning their nucleotide sequence and secondary structure and are located at identical positions as the introns AI4 and AI5 beta, respectively, in the cox1 gene of Saccharomyces cerevisiae. The sequence homology of the cob and cox1 genes around the splice points of introns AI2a, AI4, and BI4 (cob intron 4) might reflect horizontal gene transfer between the distantly related species S. pombe and S. cerevisiae.

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Trinkl H, Wolf K
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