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We report an altered pattern of genetic instability for Streptomyces coelicolor when the bacterium harbored a foreign transposon, Tn4560. Deletions, amplifications, and circularizations of the linear 8.7-Mb chromosome occurred more frequently at sites adjacent to native insertion elements, notably IS1649. In contrast, deletions, amplifications, and circularizations of a wild-type strain happened at heterogeneous sites within the chromosome. In 50 strains examined, structural changes removed or duplicated hundreds of contiguous S. coelicolor genes, altering up to 33% of the chromosome. S. coelicolor shows a bias toward one type of genetic instability during this particular assault from the environment, the invasion of foreign DNA.

journal of bacteriology

Introduction of the Foreign Transposon Tn 4560 in Streptomyces coelicolor Leads to Genetic Instability near the Native Insertion Sequence IS 1649