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Understanding the Cellular and Gene-Regulatory Mechanisms Underlying the Mesenchymal Transition of Ependymoma Tumor Cells Using Omics Approaches- [electronic resource]
Understanding the Cellular and Gene-Regulatory Mechanisms Underlying the Mesenchymal Trans...
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Understanding the Cellular and Gene-Regulatory Mechanisms Underlying the Mesenchymal Transition of Ependymoma Tumor Cells Using Omics Approaches- [electronic resource]
자료유형  
 학위논문파일 국외
최종처리일시  
20240214100101
ISBN  
9798379758417
DDC  
574
저자명  
Aubin, Rachael G.
서명/저자  
Understanding the Cellular and Gene-Regulatory Mechanisms Underlying the Mesenchymal Transition of Ependymoma Tumor Cells Using Omics Approaches - [electronic resource]
발행사항  
[S.l.]: : University of Pennsylvania., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(166 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 84-12, Section: B.
주기사항  
Includes supplementary digital materials.
주기사항  
Advisor: Camara, Pablo G.
학위논문주기  
Thesis (Ph.D.)--University of Pennsylvania, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약Childhood ependymoma is a cancer of the central nervous system with a chronic relapsing pattern. With little evidence that adjuvant chemotherapies extend patient survival, surgical resection followed by radiotherapy remains the best treatment for this disease. In children, the most common and aggressive ependymoma subgroup is posterior fossa ependymoma type A (PFA) which has a 10-year progression-free survival rate 25% and 10-year overall survival rate of 55%. Single-cell transcriptomic analyses of these tumors have identified tumor-derived cell lineages that resemble developmental radial glia cells and a tumor cell population with a mesenchymal gene expression profile that is associated with poor prognosis. However, little is known about the cellular and molecular mechanisms that enable the initiation, maintenance, and differentiation of these tumor cells. In this dissertation, we use transcriptomic (Chapter 2) and chromatin accessibility (Chapter 3) data to identify the cell types, signaling pathways, transcription factors, and enhancers associated with PFA tumor cell dynamics. We find that tumor cells that recapitulate neurodevelopmental programs are driven by WNT/β-catenin signaling while the mesenchymal phenotype is associated with TGF-β and TNF-α/NFκB signaling and the activation of transcription factors like NFkB, AP-1, MAF/BACH, MYC, and HIF1A. We are also the first to use single-cell omics data to characterize the ependymal tumor microenvironment and identify pro-inflammatory microglia as an important mediator of the mesenchymal transition of ependymoma tumor cells. Building upon on the computational methods used to analyze these data, we developed ConDecon, a clustering-independent deconvolution method for inferring high-resolution cell abundances from bulk tissues using single-cell data as reference (Chapter 4). Applying ConDecon to the transcriptomic data of pediatric ependymal tumors from the posterior fossa, we find that as tumor cells transition into a mesenchymal phenotype, microglia gain a neurodegenerative inflammatory phenotype. Altogether, these investigations improve our understanding of the oncogenic mechanisms regulated pediatric posterior fossa ependymoma and identify promising targets for therapeutic intervention.
일반주제명  
Bioinformatics.
일반주제명  
Oncology.
일반주제명  
Cellular biology.
키워드  
Brain cancer
키워드  
Deconvolution
키워드  
Mesenchymal transition
키워드  
Microglia
키워드  
Omics
키워드  
Single-cell data
기타저자  
University of Pennsylvania Bioengineering
기본자료저록  
Dissertations Abstracts International. 84-12B.
기본자료저록  
Dissertation Abstract International
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