Identification of DNA amplifications near the center of the Streptomyces coelicolor M145 chromosome.

Linear streptomycete chromosomes frequently undergo spontaneous gross DNA rearrangements at the terminal regions. Large DNA deletions of the chromosome ends are in many cases associated with tandemly reiterated DNA amplifications, found at the border of the deletable areas. In contrast to previous reports, we have discovered amplifications near the center of the Streptomyces coelicolor M145 chromosome. The detected amplified units of DNA are 19.9 kb and 16 kb in length and exist in copy numbers of 30 and 40, respectively. Both amplifications were located in the same region and share at least 3.6 kb.