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CHROMOSOMAL LOCATION OF PLEIOTROPIC NEGATIVE SPORULATION MUTATIONS IN BACILLUS SUBTILIS
James A. Hoch 1 and Judith L. Mathews 1
1 Department of Microbiology, Scripps Clinic and Research Foundation, La Jolla, California 92037
Genetic analysis by PBS-1 transduction and transformation of a large group of pleiotropic negative sporulation mutants has shown that mutations of this phenotype may be located in five genetically distinct regions. The first group of mutant sites, spoA mutations, is located in the terminal region of the chromosome and linked to the lys-1 marker by PBS-1 transduction. The second group, spoB mutations, is located between phe-1 and the attachment site for the lysogenic bacteriophage 
105. Fine structure analysis of the mutant sites within the spoB locus has been accomplished. A third location for mutants of this phenotype, spoE mutants, was found between the metC3 and ura-1 markers. Two mutants were found at this site and both were capable of sporulation, in contrast to the rest of the pleiotropic sporulation mutants. A fourth chromosomal site, spoH mutations, was found near the ribosomal and RNA polymerase loci. A large group of mutant sites, spoF mutations, was found to be linked to each other by recombination index analysis in transformation but unlinked to any of the known auxotrophic mutations comprising the chromosomal map. All mutants analyzed showing a pleiotropic negative phenotype were found to map within one of these five regions. Interspecific transformation with Bacillus amyloliquefaciens as donor has shown that all of the pleiotropic negative sporulation mutations are conserved relative to a selected group of auxotrophic markers. The degree of conservation in decreasing order is: spoH > spoF = spoB > spoA.
Revised on October 18, 1972
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