2026-09-20T18:10:53Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1154492026-06-17T14:45:51Zcom_1721.1_7582com_1721.1_7581col_1721.1_131022
Christopher A. Voigt and Alan D. Grossman.
Brophy, Jennifer Ann Noelani
Massachusetts Institute of Technology. Department of Biological Engineering.
Massachusetts Institute of Technology. Department of Biological Engineering
2018-05-17T19:06:55Z
2018-05-17T19:06:55Z
2016
http://hdl.handle.net/1721.1/115449
1035374704
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Biological Engineering, June 2016.
Cataloged from PDF version of thesis. "May 2016."
Includes bibliographical references (pages 113-134).
When engineers control gene expression, cells can be re-programmed to create living therapeutics or materials by initiating expression of biosynthetic pathways in response to specific signals. In this thesis, two new genetic tools were developed to aid the construction of genetic circuits and facilitate their delivery to bacteria isolated from diverse environments. First, antisense transcription was explored as a new tool for tuning gene expression in Escherichia coli. Antisense transcription was found to reliably repress gene expression and was applied tune simple genetic circuits. Second, an integrative conjugative element from Bacillus subtilis, ICEBsJ, was engineered to deliver exogenous DNA to diverse strains of undomesticated Gram-positive bacteria. Engineered ICEBsI conjugation was demonstrated in twenty different bacterial strains, spanning sixteen species and five genera. To demonstrate ICE's utility in creating new probiotics, the element was used to deliver functional nitrogen fixation pathways (nif clusters) to bacteria isolated from agricultural soils. Collectively, the tools presented here in provide a platform for programing bacteria from diverse environments for advanced applications.
by Jennifer Ann Noelani Brophy.
Ph.D.
xi, 134 pages
eng
Massachusetts Institute of Technology
MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.
http://dspace.mit.edu/handle/1721.1/7582
Biological Engineering.
Synthetic biology approaches for engineering diverse bacterial species
Thesis
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