Molecular Biology and Evolution, Vol 6, 1-14, Copyright © 1989 by Society for Molecular Biology and Evolution
JG Lawrence, DE Dykhuizen, RF DuBose and DL Hartl
Chromosomal DNA from 23 closely related, pathogenic strains of Escherichia
coli was digested and probed for the insertion sequences IS1, IS2, IS4,
IS5, and IS30. Under the assumption that elements residing in DNA
restriction fragments of the same apparent length are identical by descent,
parsimony analysis of these characters yielded a unique phylogenetic tree.
This analysis not only distinguished among bacterial strains that were
otherwise identical in their biochemical characteristics and enzyme
electrophoretic mobilities, but certain aspects of the topology of the tree
were consistent across several unrelated insertion elements. The
distribution of IS elements was then reexamined in light of the inferred
phylogenetic relationships to investigate the biological properties of the
elements, such as rates of insertion and deletion, and to discover apparent
recombinational events. The analysis shows that the pattern of distribution
of insertion elements in the bacterial genome is sufficiently stable for
epidemiological studies. Although the rate of recombination by conjugation
has been postulated to be low, at least two such events appear to have
taken place.
ORIGINAL ARTICLE
Phylogenetic analysis using insertion sequence fingerprinting in Escherichia coli
Department of Genetics, Washington University School of Medicine, St. Louis, Missouri 63110.
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