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Analysis of cosmids using linearization by phage lambda terminase.

H R Rackwitz, G Zehetner, H Murialdo

    Gene
    |January 1, 1985
    PubMed
    Summary
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    Researchers developed a rapid restriction mapping protocol for cosmid DNA analysis. This method aids in identifying and aligning DNA clones, localizing repetitive sequences, and interpreting complex genetic data.

    Area of Science:

    • Molecular Biology
    • Genomics
    • Biotechnology

    Background:

    • Cosmid cloning is essential for mapping large DNA regions.
    • Efficient analysis of cosmid clones is crucial for genomic research.

    Purpose of the Study:

    • To develop a rapid and high-resolution restriction mapping protocol for cosmid DNA.
    • To facilitate the analysis and alignment of cosmid clones from the mouse t complex region.

    Main Methods:

    • Isolation of cosmid clones from the mouse t complex.
    • In vitro linearization of circular cosmid DNA using phage lambda terminase.
    • Partial digestion with restriction enzymes and end-labeling via hybridization with radioactive oligos.
    • High-resolution restriction mapping for clone identification and alignment.

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    Main Results:

    • Optimized in vitro cleavage and labeling procedures for cosmid DNA.
    • Generated high-resolution restriction maps of cosmid clones.
    • Successfully identified and aligned cosmid clones.
    • Localized repetitive sequences within the mapped region.
    • Aided in the interpretation of electron microscopy heteroduplex experiments.

    Conclusions:

    • The developed restriction mapping protocol is efficient for analyzing cosmid clones.
    • This method enhances the ability to construct detailed genomic maps.
    • The protocol is valuable for identifying and ordering DNA fragments in complex genomic regions.