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Chrysanthemum stunt viroid: primary sequence and secondary structure

J Haseloff, R H Symons

    Nucleic Acids Research
    |June 25, 1981
    PubMed
    Summary

    The complete nucleotide sequence of chrysanthemum stunt viroid (CSV) was determined. Similar secondary structures between CSV and potato spindle tuber viroid (PSTV) suggest viroid structure is key for replication.

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    Area of Science:

    • Molecular biology
    • Virology
    • Plant pathology

    Background:

    • Chrysanthemum stunt viroid (CSV) is a significant plant pathogen.
    • Viroids are small, circular RNA molecules that replicate within host plants.
    • Understanding viroid sequences and structures is crucial for disease management.

    Purpose of the Study:

    • To determine the complete nucleotide sequence of chrysanthemum stunt viroid (CSV).
    • To compare the sequence of CSV with other known viroids, specifically potato spindle tuber viroid (PSTV).
    • To investigate the potential for polypeptide coding and the role of secondary structure in viroid replication.

    Main Methods:

    • Partial ribonuclease digestion of CSV to obtain overlapping fragments.
    • In vitro radiolabelling of viroid fragments at their 5'-ends.
    • Sequencing using partial enzymic cleavage methods.

    Main Results:

    • The complete 356-nucleotide sequence of CSV was determined.
    • Sixty-nine percent of the CSV sequence is homologous to the published PSTV sequence.
    • Sequence differences suggest neither CSV nor PSTV encode functional polypeptides.

    Conclusions:

    • Viroid replication may be primarily dependent on RNA secondary structure rather than protein products.
    • Structural similarities between CSV and PSTV imply a conserved mechanism for replication.
    • Further research into viroid-host interactions and structural roles in pathogenesis is warranted.

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