Coupling CRISPR interference with FACS enrichment

new approach in glycoengineering of CHO cell lines for therapeutic glycoprotein production

Katja Glinšek (Author), Lovro Kramer (Author), Aleksander Krajnc (Author), Eva Krajnc (Author), Nina Pirher (Author), Jaka Marušič (Author), Leon Hellmann (Author), Barbara Podobnik (Author), Borut Štrukelj (Author), David Ausländer (Author), Rok Gaber (Author)

Abstract

Difficulties in obtaining and maintaining the desired level of the critical quality attributes (CQAs) of therapeutic proteins as well as the pace of the development are major challenges of current biopharmaceutical development. Therapeutic proteins, both innovative and biosimilars, are mostly glycosylated. Glycans directly influence the stability, potency, plasma half-life, immunogenicity, and effector functions of the therapeutic. Hence, glycosylation is widely recognized as a process-dependent CQA of therapeutic glycoproteins. Due to the typically high heterogeneity of glycoforms attached to the proteins, control of glycosylation represents one of the most challenging aspects of biopharmaceutical development. Here, we explored a new glycoengineering approach in therapeutic glycoproteins development, which enabled us to achieve the targeted glycoprofile of the Fc-fusion protein in a fast manner. Coupling CRISPRi technology with lectin-FACS sorting enabled downregulation of the endogenous gene involved in fucosylation and further enrichment of CHO cells producing Fc-fusion proteins with reduced fucosylation levels. Enrichment of cells with targeted glycoprofile can lead to time-optimized clone screening and speed up cell line development. Moreover, the presented approach allows isolation of clones with varying levels of fucosylation, which makes it applicable to a broad range of glycoproteins differing in target fucosylation level.

Keywords

CHO cells;cell line development;fucosylation;glycoengineering;therapeutic glycoproteins;

Data

Language:	English
Year of publishing:	2022
Typology:	1.01 - Original Scientific Article
Organization:	UL FFA - Faculty of Pharmacy
UDC:	542:547.96
COBISS:	112903939
ISSN:	1860-7314
Views:	41
Downloads:	66
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary keywords:	celice CHO;razvoj celične linije;fukozilacija;glikoinženiring;terapevtski glikoproteini;Beljkovine;
Type (COBISS):	Article
Pages:	13 str.
Volume:	ǂVol. ǂ17
Issue:	ǂiss. ǂ7, art. e2100499
Chronology:	2022
DOI:	10.1002/biot.202100499
ID:	16261710