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  • Title: Construction of region-specific partial duplication mutants (merodiploid mutants) to identify the regulatory gene for the glucan-binding protein C gene in vivo in Streptococcus mutans.
    Author: Sato Y, Yamamoto Y, Kizaki H.
    Journal: FEMS Microbiol Lett; 2000 May 15; 186(2):187-91. PubMed ID: 10802169.
    Abstract:
    The gbpC gene encoding the glucan-binding protein C which is involved in dextran (glucan)-dependent aggregation (ddag) of Streptococcus mutans has been identified by random mutagenesis. We analyzed ddag(-) mutants containing the intact gbpC gene and found that these mutants possessed a large and characteristic duplication of a region of the chromosome which was responsible for the phenotype. Based upon characterization of these duplications, we developed a strategy to introduce a duplication into any specific region of the chromosome of these organisms. The 690-bp gene responsible for the ddag(-) phenotype was identified within a 60-kb region by observing ddag (positive or negative) phenotypes of successively constructed specific duplication mutants.
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