Gene Transfer in CAULOBACTER CRESCENTUS: Polarized Inheritance of Genetic Markers

AUTOR(ES)

Newton, Austin

RESUMO

Recombination frequencies were determined for 15 independently isolated auxotrophs of C. crescentus crossed pairwise in all possible combinations. The results indicate that the mutants may be grouped into at least two types: "fertile" strains, which recombine with all other mutants at frequencies ranging from less than 10-6 to 3 x 10 -2, and "nonfertile" strains which recombine with fertile strains at high frequencies and with other nonfertile strains at low or negligible frequencies. Several lines of evidence indicate a polarized inheritance of markers. Two of these are (1) the preferential inheritance of unselected markers from the nonfertile parent in fertile x nonfertile crosses, and (2) the consistent ordering of markers based on the frequency at which the mutants recombine with each of the three fertile strains. Although the evidence is not conclusive at this point, the results are most consistent with conjugation as the mechanism of gene transfer in these bacteria.

Documentos Relacionados

• Catalase-peroxidase of Caulobacter crescentus: function and role in stationary-phase survival.
• Periodic surface array in Caulobacter crescentus: fine structure and chemical analysis.
• Cell-cycle-dependent polar morphogenesis in Caulobacter crescentus: roles of phospholipid, DNA, and protein syntheses.
• Physical mapping and complementation analysis of transposon Tn5 mutations in Caulobacter crescentus: organization of transcriptional units in the hook gene cluster.
• Copper-zinc superoxide dismutase of Caulobacter crescentus: cloning, sequencing, and mapping of the gene and periplasmic location of the enzyme.