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New map of bacteriophage lambda DNA.

D L Daniels, J R de Wet, F R Blattner

    Journal of Virology
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Researchers created a detailed bacteriophage lambda map using restriction enzyme analysis. This DNA map precisely locates 41 cut sites, providing a highly accurate molecular blueprint for genetic studies.

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    Area of Science:

    • Molecular Biology
    • Genomics
    • Virology

    Background:

    • Accurate bacteriophage lambda genome mapping is crucial for understanding viral replication and gene expression.
    • Previous restriction enzyme mapping provided a foundational understanding but lacked precision for all cut sites.

    Purpose of the Study:

    • To construct a high-resolution restriction map of bacteriophage lambda.
    • To precisely determine the locations of 41 restriction enzyme cut sites.
    • To establish a reliable molecular map for future genetic and molecular studies of bacteriophage lambda.

    Main Methods:

    • Generated over 100 DNA fragments using single, multiple, and partial digestions with 12 distinct restriction enzymes.
    • Precisely measured fragment sizes against calibrated standards derived from known DNA sequences.

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  • Employed least-squares analysis to determine map coordinates and assign fragment positions.

    • Main Results:

    • Developed a bacteriophage lambda map with accurate positions for 41 restriction enzyme cut sites.
    • Fragment size predictions from the map showed a maximum deviation of +/- 5% from experimental measurements.
    • Calculated the total genome length as 49,133 nucleotide pairs, with an estimated accuracy of +/- 500 base pairs.

    Conclusions:

    • The constructed bacteriophage lambda map offers unprecedented accuracy in restriction site localization.
    • The high precision of the map validates its utility for detailed molecular and genetic analyses.
    • This resource facilitates further research into bacteriophage lambda's genome structure and function.