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Related Experiment Videos

Circular structures in retroviral and cellular genomes

F G Albert1, E C Bronson, D J Fitzgerald

  • 1Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA.

The Journal of Biological Chemistry
|October 6, 1995
PubMed
Summary

Computer analysis identified intrinsically circular DNA structures in HIV and cellular genomes. These conserved DNA structures facilitate DNA looping, crucial for recombination and other genomic processes.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • DNA structure and function are critical for genomic processes.
  • Identifying novel DNA structural motifs can reveal new biological mechanisms.
  • Retroviral genomes, like HIV, offer unique insights into DNA dynamics.

Purpose of the Study:

  • To identify and characterize intrinsically circular DNA structures using computational methods.
  • To investigate the prevalence and conservation of these structures in viral and cellular genomes.
  • To explore the functional implications of circular DNA structures in recombination and protein-DNA interactions.

Main Methods:

  • Utilized a computer program to predict DNA bending from nucleotide sequences.
  • Analyzed retroviral (HIV-I, HIV-II, SIV) and GenBank cellular DNA sequences.

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  • Performed in vitro ligation experiments to assess circularization efficiency of identified sequences.
  • Introduced a single nucleotide substitution to evaluate its impact on DNA planarity and cyclization.

    • Main Results:

    • Identified an 830-base pair circular structure in the human immunodeficiency virus type I (HIV-I) genome, conserved across related viruses.
    • Found similar circular structures associated with various recombination, replication, and transposition systems in cellular DNA.
    • Experimental data confirmed preferential circularization of computer-identified sequences, with mutations reducing cyclization rates.

    Conclusions:

    • Intrinsically circular DNA structures are prevalent in both viral and cellular genomes.
    • These structures are conserved and associated with key genomic processes like recombination and DNA looping.
    • The findings suggest a role for intrinsic DNA curvature in facilitating protein-DNA complex formation and genomic regulation.