Abstract
Many Streptomyces species exhibit a very high degree of genetic instability which is usually manifested as genomic rearrangements such as large deletions. In Streptomyces ambofaciens DSM40697, two levels of genetic instability were previously described: (i) a basic genetic instability similar to that reported for other strains, and (ii) hypervariability, a phenomenon that we believe to be a new aspect of instability closely associated with DNA amplification. A large DNA region undergoes deletions, amplifications and large genomic changes strictly associated with both aspects of genetic instability. The genetic and molecular analyses of the different aspects of genetic instability allow us to propose that they result from a cascade of molecular events and to investigate the relationships between genetic instability phenomena and genome fluidity.
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