All ETDs from UAB

Advisory Committee Chair

Norman P Higgins

Advisory Committee Members

David Briles

Natalia Kedishvili

Kiril Popov

Janet Yother

Document Type


Date of Award


Degree Name by School

Doctor of Philosophy (PhD) Heersink School of Medicine


The bacterial chromosome is dynamic. The principle goal of my research is to understand how DNA topology is altered by transcription in Salmonella enterica serovar Typhimurium LT2. Gamma delta-resolution requires two direct repeat Res sites to pair a plectonemic synapse. Previous work from our lab showed that the zones of high transcription inhibited gamma delta-resolution. Using phage λ recombineering methods, we have developed Salmonella strains to study ribosomal RNA operons, which are the most highly transcribed genes in bacteria. We propose a molecular model for how supercoiling generated by high levels of transcription modifies chromosome structure.