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MutagenizedE. coli B/r cells were subjected to a procedure designed to select mutants temperature-sensitive for initiation of deoxyribonucleic acid (DNA) replication. Seventeen mutants exhibiting limited residual DNA synthesis at 42 C were obtained and thedna − sites were mapped genetically. Sixteen of the sites map neardnaA, dnaB , anddnaC . One mutant (dna-208 ) maps in a new location between thetrp andhis genes. We propose to call this mutantdnaI208 . In complementation experimentsdnaC + anddnaI + were dominant todnaC − anddnaI − alleles, respectively. However,dnaA − was dominant to the wild-type allelednaA + . AlldnaA mutants and four out of sixdnaC mutants could be suppressed by F factor integration. The pattern of suppression was specific for each mutant.

Mutants of Escherichia coli B/r Defective in Deoxyribonucleic Acid Initiation: dnaI , a New Gene for Replication