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A spoVAA::lacZ gene fusion has been used to study expression of the spoVA operon during sporulation in Bacillus subtilis. beta-Galactosidase activity, encoded by the fusion gene, begins to be produced about 2.5 h after the induction of sporulation, well before the phenotypic consequences of spoVA mutations are manifested. spoVA expression is dependent on all of the known spo0 and spoII loci and on some of the 'early' spoIII loci, but not on 'later' loci. Several lines of evidence suggest that spoVA expression occurs only in the spore compartment. The implications of this observation for models of the overall regulation of gene expression during sporulation are discussed.

microbiology

Use of a lacZ Gene Fusion to Determine the Dependence Pattern and the Spore Compartment Expression of Sporulation Operon spoVA in spo Mutants of Bacillus subtilis