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- W1979188285 abstract "Myxomycetes (plasmodial slime molds) belonging to the order Physarales contain obligatory group I introns at positions 1949 and 2449 in their large subunit ribosomal RNA gene. Here, we report 36 group I introns from the Didymiaceae family (order Physarales) from 18 isolates representing three genera and seven species, and have reconstructed both host and intron phylogenies. The introns, named L1949 and L2449, were found in all isolates analyzed, consistent with an obligatory distribution in Didymiaceae. The introns fold at the RNA-level into typical group I ribozyme core structures that are relatively conserved, but contain large and highly variable extension sequences in peripheral domains without any detectable protein coding capacities. Furthermore, the L1949 and L2449 introns have probably become dependent on host factors for folding or activity. This assumption is based on that all introns tested for self-splicing in vitro failed to ligate the flanking exon regions. Phylogenies based on LSU rDNA and intron sequences are consistent with that the L1949 and L2449 introns follow a strict vertical inheritance within Didymiaceae. We suggest that the Didymiaceae L1949 and L2449 introns are well suited as high-resolution markers in genetic assessments at various taxonomic levels, from closely related strains of a single species to separating genera." @default.
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- W1979188285 date "2007-05-01" @default.
- W1979188285 modified "2023-10-18" @default.
- W1979188285 title "Obligatory group I introns with unusual features at positions 1949 and 2449 in nuclear LSU rDNA of Didymiaceae myxomycetes" @default.
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- W1979188285 doi "https://doi.org/10.1016/j.ympev.2006.11.004" @default.
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