Replication infidelity during a single cycle of Ty1 retrotransposition

A. Gabriel, M. Willems, E. H. Mules, J. D. Boeke

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Retroviruses undergo a high frequency of genetic alterations during the process of copying their RNA genomes. However, little is known about the replication fidelity of other elements that transpose via reverse transcription of an RNA intermediate. The complete sequence of 29 independently integrated copies of the yeast retrotransposon Ty1 (173,043 nt) was determined, and the mutation rate during a single cycle of replication was calculated. The observed base substitution rate of 2.5 x 10-5 bp per replication cycle suggests that this intracellular element can mutate as rapidly as retroviruses. The pattern and distribution of errors in the Ty1 genome is nonrandom and provides clues to potential in vivo molecular mechanisms of reverse transcriptase-mediated error generation, including heterogeneous RNase H cleavage of Ty1 RNA, addition of terminal nontemplated bases, and transient dislocation and realignment of primer-templates. Overall, analysis of errors generated during Ty1 replication underscores the utility of a genetically tractable model system for the study of reverse transcriptase fidelity.

    Original languageEnglish (US)
    Pages (from-to)7767-7771
    Number of pages5
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume93
    Issue number15
    DOIs
    StatePublished - 1996

    ASJC Scopus subject areas

    • General

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