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Related Experiment Videos

Chimeric plasmid transformation in Haemophilus influenzae

N V Khalap1, V P Joshi

  • 1Molecular Biology and Agriculture Division, Bhabha Atomic Research Centre, Bombay, India.

Indian Journal of Experimental Biology
|April 1, 1996
PubMed
Summary

A mutant strain of Haemophilus influenzae (N19) showed poor DNA integration and failed to transfer the novr gene compared to the wild type. This indicates impaired plasmid establishment in the mutant.

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Area of Science:

  • Molecular biology
  • Microbial genetics

Background:

  • Haemophilus influenzae is a bacterium relevant to genetic studies.
  • DNA transformation and integration are key processes in bacterial genetics.
  • Plasmid establishment is crucial for maintaining genetic material in bacteria.

Purpose of the Study:

  • To investigate the fate of plasmid DNA in a mutant strain of H. influenzae.
  • To compare DNA integration and gene transfer efficiency between a mutant and wild-type strain.
  • To understand the role of specific mutations in DNA processing and plasmid establishment.

Main Methods:

  • Utilized 32P-labelled plasmid DNA (pJ1-8N19) for tracking.
  • Compared DNA uptake and integration in mutant strain N19 and wild-type H. influenzae Rd.

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  • Measured transfer of the novr gene and biological activity post-incubation.

    • Main Results:

    • Mutant strain N19 exhibited negligible 32P-label transfer compared to the wild type.
    • No detectable transfer of the novr gene or biological activity was observed in the mutant.
    • Poor extra-chromosomal establishment of the donor plasmid was correlated with reduced DNA integration in N19.

    Conclusions:

    • The N19 mutation significantly impairs DNA integration and plasmid establishment in H. influenzae.
    • The study highlights the importance of host factors in successful DNA transformation and maintenance.
    • Findings provide insights into the genetic basis of DNA processing in bacteria.