Login (DCU Staff Only)
Login (DCU Staff Only)

DORAS | DCU Research Repository

Explore open access research and scholarly works from DCU

Advanced Search

Investigating phenotype variability between industrially relevant Chinese hamster ovary (CHO) clonally derived cell lines.

Bryan, Laura orcid logoORCID: 0000-0002-9422-2338 (2021) Investigating phenotype variability between industrially relevant Chinese hamster ovary (CHO) clonally derived cell lines. PhD thesis, Dublin City University.

Abstract
Chinese hamster ovary (CHO) cells are the most commonly used host cell line for the production of human therapeutic proteins. Improvements in CHO cell yields to date have largely been attributed to bioprocess and media formulation improvements. Genetic engineering of CHO cell lines with desirable phenotypes has recently become an area of interest amongst researchers; however, for this to be possible we must gain an improved understanding of the systems biology of CHO cells and the intracellular pathways which drive desirable production phenotypes. This thesis explores the use of advanced proteomic and molecular biology techniques to characterise desirable phenotypes related to growth and specific productivity (Qp) in industrially relevant Chinese hamster ovary (CHO) cell lines. Panels of clonally derived industrially relevant CHO cell lines (CDCLs) were characterised using LC-MS/MS and miRNA profiling. MiR-200a was identified as a miRNA which is highly expressed in high Qp CDCLs and when overexpressed in CHO cells results in increased titre and Qp. Results suggested that miR-200a plays an important role in post-transcriptional regulation of the UPR. Phosphoproteome analysis of high and low Qp CHO CDCLs allowed us to investigate phosphorylation events associated with high/low Qp phenotypes. Phosphoproteins and total proteins associated with amino acid sensing were highlighted as important in high Qp CDCLs. Intracellular pathways associated with high/low transcript copy numbers (TCN) in CHO cells were also investigated. IRE1 mediated UPR was found to be highly expressed in high TCN CDCLs and this is suggested to result in maximised folding capacity in these cells. Growth related phenotypes were also characterised in CHO CDCLs and proteins/pathways associated with fast growth rate and extended viable cell density phenotypes were identified. The proteomic and molecular data presented in this thesis provides a deeper understanding into the intracellular pathways which influence desirable phenotypes in CHO cells.
Metadata
Item Type:Thesis (PhD)
Date of Award:November 2021
Refereed:No
Supervisor(s):Meleady, Paula and Clynes, Martin
Subjects:Biological Sciences > Biotechnology
Biological Sciences > Cell biology
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Science and Health > School of Biotechnology
Research Initiatives and Centres > National Institute for Cellular Biotechnology (NICB)
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 License. View License
Funders:Irish Research Council
ID Code:26215
Deposited On:01 Nov 2021 12:06 by Paula Meleady . Last Modified 01 Nov 2021 12:06
Documents

Full text available as:

[thumbnail of Final hardbound thesis Laura Bryan.pdf] PDF - Archive staff only. This file is embargoed until 1 October 2025 - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
5MB
Downloads

Downloads

Downloads per month over past year

Archive Staff Only: edit this record