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Amplified DNA in Streptomyces fradiae
Journal of Bacteriology
|August 1, 1983
Summary
A spontaneous Streptomyces fradiae mutant exhibited DNA amplification, with a 10.5 kb unit increasing to 500 copies per chromosome. This amplified DNA, designated Ads1SF, was characterized and found to contain tandem repeats.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Streptomyces species are known for their genetic plasticity.
- Spontaneous mutations can lead to significant genomic alterations.
Purpose of the Study:
- To characterize a novel amplifiable DNA unit in a Streptomyces fradiae mutant.
- To investigate the structure and copy number of the amplified DNA sequence.
Main Methods:
- Isolation and characterization of amplified DNA from a Streptomyces fradiae mutant.
- Cloning of SalI fragments into Escherichia coli for restriction mapping.
- Analysis of DNA base composition and copy number.
Main Results:
- A 10.5 kb amplifiable DNA unit (Ads1SF) was identified and amplified to ~500 copies per chromosome.
- The amplified DNA consists of tandem repeats and has a high G+C content (71%).
- A portion of this DNA unit was detected at low copy number in the wild-type strain.
Conclusions:
- The Ads1SF element represents a novel amplifiable DNA sequence in Streptomyces fradiae.
- Amplification of this cryptic DNA may play a role in genomic adaptation.
- Further research is needed to elucidate the function and regulation of Ads1SF.