Insertion sequences (ISs), arguably the smallest and most numerous autonomous
transposable elements (TEs), are important players in shaping their host genomes. This …

SUMMARY “Common regions”(CRs), such as Orf513, are being increasingly linked to mega-
antibiotic-resistant regions. While their overall nucleotide sequences show little identity to …

INTRODUCTION Escherichia c (li is usually considered to be an opportun-istic pathogen
which constitutes a large portion of the normal intestinal flora of humans. This organism can …

Horizontal gene transfer (HGT) contributes greatly to the plasticity and evolution of
prokaryotic and eukaryotic genomes. The main carriers of foreign DNA in HGT are mobile …

The hemolytic Escherichia coli strain 536 (O6) propagates spontaneous hemolysin-negative
mutants at relatively high rates (10 (-3) to 10 (-4)). One type of mutant (type I) lacks both …

Plasmids are common residents of phytopathogenic bacteria and contribute significantly to
host evolution in a multi-faceted manner. Plasmids tend to encode determinants of virulence …

The ability of certain strains of Escherichia coli to lyse erythrocytes of different mammalian
species (hemolysis) was first described by Kayser in 1903. The hemolytic activity was …

IS 91 is the prototype element of a family of bacterial insertion sequences that transpose by
a rolling-circle mechanism. Although previously considered a rarity among IS elements …

In this study, we determined the boundaries of a 99-kb deletable element of Shigella flexneri
2a strain YSH6000. The element, designated the multiple-antibiotic resistance deletable …

This chapter reviews a class of insertion sequence (IS) elements, the IS 91 family, that
occupies a definite genetic niche, probably as a consequence of a rather peculiar …