Summary
Arsenate sensitive mutants were isolated from Bacillus subtilis strain 168 after treatment with N-methyl-N′-nitro-N-nitrosoguanidine or ethyl methane sulfonate. Though all mutants are phenotypically identical, a high proportion (40%) of the induced mutations are of a multisite nature as they do not revert spontaneously and are poorly transformable to arsenate resistance with wild type DNA. On the basis of transformation efficiency, UV inactivation kinetics and cotransduction frequency of outside markers, four independently isolated multisite arsenate sensitive mutations are characterized as resulting from large deletions of homogenous size (24000±6000 base pairs). The arsenate resistance locus was mapped between phe and aroD on the B. subtilis chromosome by PBS1 mediated transduction. Mechanisms for the formation of such chromosomal deletions are discussed.
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Communicated by P. Starlinger
Part of the dissertation of Alice Adams Lindahl, presented to New York University in partial fulfillment of requirements for the Ph. D. degree. A preliminary report of this work was presented at the NATO International Symposium, Mol, Belgium, August 1970.
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Adams, A., Oishi, M. Genetic properties of arsenate sensitive mutants of Bacillus subtilis 168. Molec. gen. Genet. 118, 295–310 (1972). https://doi.org/10.1007/BF00333565
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DOI: https://doi.org/10.1007/BF00333565