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Related Experiment Videos

C1 inhibitor gene sequence facilitates frameshift mutations

J J Bissler1, Q S Meng, T Emery

  • 1The Children's Hospital Research Foundation, Cincinnati, Ohio, USA. john.bissler@chmcc.org

Molecular Medicine (Cambridge, Mass.)
|February 17, 1999
PubMed
Summary
This summary is machine-generated.

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Hereditary angioneurotic edema is linked to C1 inhibitor mutations. Researchers found that imperfect inverted repeats in bacteria cause frameshift mutations, similar to those in human disease, suggesting a common molecular mechanism.

Area of Science:

  • Genetics
  • Molecular Biology
  • Biochemistry

Background:

  • Hereditary angioneurotic edema results from C1 inhibitor dysfunction.
  • Patient mutations suggest a role for imperfect inverted repeat sequences.
  • The mechanistic role of these sequences in mutation was previously postulated.

Purpose of the Study:

  • To investigate the mutation rate of an imperfect inverted repeat sequence.
  • To determine if this sequence plays a mechanistic role in mutations.
  • To assess the influence of recombination and superhelical tension on mutation frequency.

Main Methods:

  • Cloning an imperfect inverted repeat into the chloramphenicol acetyltransferase gene in pBR325.
  • Studying mutation rates in four bacterial strains with varying recombination and superhelical tension.

Related Experiment Videos

  • Scoring mutations that confer chloramphenicol resistance (Cmr).

    • Main Results:

    • Reversion frequencies in isogenic bacterial strains were approximately 10(-8).
    • Frameshift mutations involving deletions or tandem duplications within the inverted repeat were common.
    • Increased DNA superhelical tension did not enhance mutagenesis.

    Conclusions:

    • The imperfect inverted repeat can cause frameshift mutations via deletion or duplication, mirroring human hereditary angioneurotic edema mutations.
    • The findings suggest stem-loop formation in single-stranded DNA, rather than cruciform extrusion, is responsible for mutagenesis.
    • Replication slippage models involving the lagging strand can explain these mutation events.