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dc.contributor.advisorToker, Alex
dc.contributor.authorBaker, Allison Renee
dc.date.accessioned2022-03-18T04:05:44Z
dash.embargo.terms2022-09-17
dc.date.created2022
dc.date.issued2022-03-17
dc.date.submitted2022-03
dc.identifier.citationBaker, Allison Renee. 2021. ADAR1 and RNA editing in triple-negative breast cancer. Doctoral dissertation, Harvard University Graduate School of Arts and Sciences.
dc.identifier.other28867559
dc.identifier.urihttps://nrs.harvard.edu/URN-3:HUL.INSTREPOS:37371109*
dc.description.abstractThe family of Adenosine Deaminases Acting on RNA (ADARs) regulate global gene expression output by catalyzing Adenosine-to-Inosine (A-to-I) editing of double-stranded RNA and through interacting with RNA and other proteins. ADARs play important roles in development and disease, and previous work has shown that ADAR1 is oncogenic in a growing list of cancer types. ADAR1 overexpression and over-editing are prevalent in triple-negative breast cancer and correlate with poor prognosis. Given the unmet medical need for targeted therapies in this breast cancer subtype, we performed an in-depth analysis of ADAR1 function and mechanism in triple-negative breast cancer in order to demonstrate its potential as a cancer target. By genetic perturbation of ADAR1, we show that it is critical for promoting growth (including viability and cell cycle progression), invasion, and mammosphere formation in triple-negative breast cancer cells. Whole transcriptome sequencing analyses reveal ADAR1 regulation of both coding and non-coding targets via gene expression level, A-to-I editing, and splicing. Furthermore, ADAR1-regulated targets are enriched for pathways involved in growth and invasion, as well as cytokine and immune signaling. We investigate an edit site in the coding sequence of filamin B (FLNB chr3:58156064) and determine that editing lowers the tumor suppressive function of the protein to promote growth and invasion. We also demonstrate that the tumor suppressor microRNAs miR-27a-5p and miR-4485-3p are upregulated upon ADAR1 loss and suppress cell cycle progression and invasion. This work describes a role for ADAR1 in promoting cancer hallmarks in triple-negative breast cancer, profiles broad transcriptomic alterations in this context upon ADAR1 loss, and identifies several novel mechanisms of ADAR1-mediated oncogenesis, contributing evidence to promote treatment strategies targeting ADAR1 in triple-negative breast cancer, an aggressive subtype with few treatment options.
dc.format.mimetypeapplication/pdf
dc.language.isoen
dash.licenseLAA
dc.subjectADAR
dc.subjectbreast cancer
dc.subjectepitranscriptome
dc.subjectRNA editing
dc.subjectBiology
dc.subjectOncology
dc.subjectMolecular biology
dc.titleADAR1 and RNA editing in triple-negative breast cancer
dc.typeThesis or Dissertation
dash.depositing.authorBaker, Allison Renee
dash.embargo.until2022-09-17
dc.date.available2022-03-18T04:05:44Z
thesis.degree.date2021
thesis.degree.grantorHarvard University Graduate School of Arts and Sciences
thesis.degree.levelDoctoral
thesis.degree.namePh.D.
dc.contributor.committeeMemberKennedy, Scott
dc.contributor.committeeMemberGreer, Eric
dc.contributor.committeeMemberPiskounova, Elena
dc.type.materialtext
thesis.degree.departmentMedical Sciences
dc.identifier.orcid0000-0003-2030-7379
dash.author.emailbakerallison7@gmail.com


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