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Related Experiment Videos

Insertion sequences

J Mahillon1, M Chandler

  • 1Laboratoire de Génétique Microbienne, Université catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium.

Microbiology and Molecular Biology Reviews : MMBR
|September 8, 1998
PubMed
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Insertion sequences (ISs) are mobile genetic elements found in bacterial genomes. This review classifies 443 ISs into 17 families based on genetic organization, transposase enzymes, and target site characteristics.

Area of Science:

  • Genetics
  • Molecular Biology
  • Microbiology

Background:

  • Insertion sequences (ISs) are ubiquitous mobile genetic elements in bacterial genomes.
  • Over 500 ISs are known, with ongoing discovery in genome projects.
  • Recent advances include in vitro transposition systems and mechanistic understanding.

Purpose of the Study:

  • To review the organization and function of ISs across eubacterial, archaebacterial, and eukaryotic origins.
  • To emphasize bacterial ISs and their transposition mechanisms.
  • To propose a classification framework for ISs.

Main Methods:

  • Review of existing literature on ISs.
  • Analysis of genetic organization, transposase (Tpase) similarities, terminal inverted repeats (IRs), and target site duplication.

Related Experiment Videos

  • Grouping of 443 IS members into 17 families based on these criteria.

    • Main Results:

    • A classification system for ISs into 17 families is presented.
    • Criteria for classification include genetic organization, Tpase identity, IR features, and target site duplication.
    • The review details IS mobility mechanisms and Tpase structure-function relationships where known.

    Conclusions:

    • Insertion sequences are diverse and can be systematically classified.
    • Understanding IS organization and transposition mechanisms is crucial.
    • This classification provides a framework for studying IS evolution and function.