Spontaneous switching of the sucrose-promoted colony phenotype in Streptococcus sanguis.

@article{Tardif1989SpontaneousSO,
  title={Spontaneous switching of the sucrose-promoted colony phenotype in Streptococcus sanguis.},
  author={G N Tardif and Mark C Sulavik and Gareth Wyn Jones and Don B. Clewell},
  journal={Infection and immunity},
  year={1989},
  volume={57 12},
  pages={3945-8}
}
Streptococcus sanguis on media containing 3% sucrose gives rise to characteristic hard cohesive colonies (designated Spp+). Populations of Spp+ bacteria (strain Challis) on sucrose media switch to a soft noncohesive phenotype (designated Spp-) at a frequency of 10(-4) to 10(-3). Spp- bacteria switch back to Spp+ bacteria at a similar frequency. Successive rounds of Spp variation were observed. The Spp phenotypic switch was associated with changes in extracellular glucosyltransferase activity. 

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