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. 1985 Aug;163(2):411–416. doi: 10.1128/jb.163.2.411-416.1985

Genetic analysis of spo0A and spo0C mutants of Bacillus subtilis with a phi 105 prophage merodiploid system.

T Ikeuchi, J Kudoh, K Kurahashi
PMCID: PMC219137  PMID: 3926745

Abstract

An 8.0-kilobase chromosomal fragment of Bacillus subtilis which contained an intact spo0A gene was recloned onto temperate phage phi 105 from the rho 11dspo0A+-1 transducing phage. A specialized transducing phage, phi 105-dspo0A+-1, was constructed and used to transduce the spo0A12 mutant strain 1S9. A Spo+ transductant which was a single lysogen of the phi 105dspo0A+-1 transducing phage was isolated. From competent cells of this Spo+ transductant was isolated a Spo- (Spo0A) strain which was immune to phi 105. It was used to prepare a lysate of the phi 105dspo0A12 phage. Transduction of the spo0C9V recE4 strain with the phi 105dspo0A12 and phi 105dspo0A+-1 phages was carried out. The phi 105dspo0A+-1 phage gave rise to a large number of heat-resistant cells, but the phi 105dspo0A12 phage formed no heat-resistant cells. These results indicate that the spo0A12 and spo0C9V mutant genes do not complement each other in the ability to sporulate and that the spo0C9V mutation is located within the spo0A gene. Although the spo0C9V strain was completely asporogenous, the spo0C9V/spo0C9V diploid strain produced heat-resistant cells at a frequency of ca. 10(-3) in the sporulation medium. This result indicates that two copies of the spo0C9V mutant gene partially restore the ability of these cells to sporulate.

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Selected References

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