The roles of mutation accumulation and selection in loss of sporulation in experimental populations of Bacillus subtilis.
Phenotypic loss is an important evolutionary force in nature but the mechanism(s) responsible for loss remains unclear. We used both simulation and multiple-regression approaches to analyze data on the loss of sporulation, a complex bacterial developmental process, during experimental evolution of Bacillus subtilis. Neutral processes of mutational degradation alone were sufficient to explain loss-of-sporulation ability in four of five populations, while evidence that selection facilitated mutational loss was found for only one population. These results are discussed in the context of the evolution of sporulation in particular and phenotypic loss in general.
Maughan
Heather
H
Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721, USA. maughan@zoology.ubc.ca
Masel
Joanna
J
Birky
C William
CW
Nicholson
Wayne L
WL
D001412:Bacillus subtilis / Q000235:genetics* / Q000502:physiology; D005075:Biological Evolution; D005828:Genetics, Population; D009154:Mutation; D010641:Phenotype; D012641:Selection, Genetic; D013171:Spores, Bacterial / Q000235:genetics*