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Relationship of viroids and certain other plant pathogenic nucleic acids to group I and II introns

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Summary

The nucleotide sequences of viroids contain features believed to be essential for the splicing of group I introns. Common sequence elements include a 16-nucleotide consensus sequence and three pairs of short sequences arranged in the same sequential order in both types of RNAs. The calculated probability of finding sequences resembling the 16-nucleotide consensus sequence in random nucleotide chains showed that at low fidelity (up to 5 mismatched nucleotides), the number of such sequences in viroids, plant viral satellite RNAs, plant viral RNAs and one plant viral DNA, group I introns and flanking exons does not significantly differ from the number expected at random. As the degree of fidelity is increased, the number in both introns and viroids, but not in exons or the other plant pathogens examined, greatly exceeds that expected in random chains. These findings suggest that viroids may have evolved from group I introns and/or that processing of viroid oligomers to monomers may have structural requirements similar to those of group I introns. The nucleotide sequences of viroids do not show close homology with two conserved regions of group II introns, the 14-base pair consensus region and the 5′ terminal segment. However, close homology does exist between the conserved sequence of the 3′ terminal segment of group II introns and viroids thus suggesting a possible evolutionary or functional relationship.

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  1. Microbiology and Plant Pathology Laboratory, Plant Protection Institute, ARS, U.S. Department of Agriculture, 20705, Beltsville, MD, U.S.A.

    A. Hadidi

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Hadidi, A. Relationship of viroids and certain other plant pathogenic nucleic acids to group I and II introns. Plant Mol Biol 7, 129–142 (1986). https://doi.org/10.1007/BF00040139

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