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Related Experiment Videos

Cosmid DNA packaging in vivo.

M Feiss, D A Siegele, C F Rudolph

    Gene
    |February 1, 1982
    PubMed
    Summary

    Cosmid DNA packaging into phage lambda particles relies on specific DNA multimer formation. Yield decreases as cosmid DNA length increases, dependent on the lambda gam gene product for replication.

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    Virology·2000

    Area of Science:

    • Molecular Biology
    • Genetics
    • Virology

    Background:

    • Cosmids are vectors used for cloning large DNA fragments.
    • Phage lambda is a bacteriophage commonly used in molecular biology.
    • Efficient packaging of cosmid DNA into phage particles is crucial for gene cloning and transfer.

    Purpose of the Study:

    • To describe the packaging of cosmid DNA into phage lambda particles.
    • To investigate the relationship between cosmid DNA multimerization and phage packaging efficiency.
    • To identify genetic factors influencing cosmid DNA packaging.

    Main Methods:

    • Analysis of cosmid DNA within transducing phage lambda particles.
    • Quantification of cosmid transducing phage yield.
    • Investigation of the role of the lambda gam gene in cosmid DNA replication.

    Main Results:

    • Cosmid transducing phages contain linear multimers of cosmid DNA.
    • The number of cosmid copies required for packaging correlates with DNA length.
    • Phage yield significantly decreases with increasing cosmid DNA length.
    • Cosmid DNA replication requires the lambda gam gene product, similar to lambda rolling-circle replication.

    Conclusions:

    • Cosmid packaging efficiency is limited by DNA length and multimerization.
    • The lambda gam gene product is essential for the replication of cosmid DNA used in packaging.
    • Understanding these mechanisms is vital for optimizing cosmid-based cloning and transduction systems.

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