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Related Experiment Videos

Deletions within E. coli plasmids carrying yeast rDNA.

A Cohen, D Ram

    Gene
    |April 1, 1978
    PubMed
    Summary

    Recombinant DNA plasmids with yeast ribosomal DNA (rDNA) inserts undergo deletions. These deletions, often involving homologous recombination, occur more frequently in rec+ cells and lead to repeat loss.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Recombinant DNA Technology

    Background:

    • Recombinant DNA technology facilitates the study of genetic elements.
    • Yeast ribosomal DNA (rDNA) is a well-characterized genetic locus.
    • Bacterial plasmids like pSC101 and pMB9 are common vectors for genetic manipulation.

    Purpose of the Study:

    • To investigate the mechanisms of DNA deletions in engineered plasmids.
    • To determine the role of homologous recombination in rDNA deletion events.
    • To analyze the influence of host cell recombination (rec) status on deletion frequency.

    Main Methods:

    • Construction of recombinant plasmids containing yeast rDNA inserts in E. coli vectors.
    • Analysis of deletion products using molecular techniques.
    • Comparison of deletion frequencies in rec+ and recA- E. coli strains.

    Main Results:

    • Deletions were observed in plasmids with tandem yeast rDNA repeats.
    • Deletion products consistently lost one complete rDNA repeat, suggesting homologous recombination.
    • Deletions occurred in both rec+ and recA- cells, but were more frequent in rec+ cells.
    • Oligomerization of deletion products also occurred more frequently in rec+ cells.

    Conclusions:

    • Homologous recombination is a primary mechanism for deletions in these recombinant plasmids.
    • The presence of duplicated regions, specifically terminal redundancy in rDNA inserts, promotes deletions.
    • Host cell recombination proficiency influences the frequency of both deletions and oligomerization.

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