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Tandem duplication in bacteriophage P2: electron microscopic mapping.

D K Chattoraj, R B Inman

    Proceedings of the National Academy of Sciences of the United States of America
    |February 1, 1974
    PubMed
    Summary

    Mapping the Escherichia coli bacteriophage P2 vir37 mutant revealed a tandem duplication. This finding supports the colinearity of the bacteriophage P2 physical and genetic maps.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Escherichia coli bacteriophage P2 is a well-studied model organism.
    • Understanding bacteriophage genome organization is crucial for molecular biology.
    • Immunity-insensitive mutants provide insights into phage genetics.

    Purpose of the Study:

    • To physically map the location of the vir37 mutation in the Escherichia coli bacteriophage P2 genome.
    • To investigate the nature of the genetic alteration in the P2 vir37 mutant.
    • To further assess the colinearity between the physical and genetic maps of bacteriophage P2.

    Main Methods:

    • Electron microscopic heteroduplex mapping was employed to determine the physical location of the mutation.
    • Denaturation mapping studies were used to characterize DNA segments.
    • Analysis of the P2 vir37 mutant's DNA structure.

    Main Results:

    • The vir37 mutation was mapped to a specific region of the bacteriophage P2 genome.
    • P2 vir37 exhibits a tandem duplication of a DNA segment (2.8% of P2 DNA).
    • The duplicated segment is located between 77.2 and 80.0% from the left end of the P2 DNA.

    Conclusions:

    • The physical and genetic maps of bacteriophage P2 are colinear.
    • The P2 vir37 mutant provides further evidence supporting the colinearity of these maps.
    • The identified tandem duplication in P2 vir37 contributes to understanding phage genome structure and evolution.

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