Transcriptomic Insights Into Serum-Free Medium Adaptation and Temperature Reduction in Chinese Hamster Ovary Cell...

Area of Science:

• Biotechnology
• Molecular Biology
• Genomics

Background:

• Chinese hamster ovary (CHO) cells are crucial for biopharmaceutical production, but low yields increase market prices.
• Current methods for improving yields lack insight into internal molecular dynamics.
• RNA-sequencing (RNA-seq) provides a powerful tool to analyze gene expression and understand cellular responses.

Purpose of the Study:

• To integrate RNA-seq data from multiple CHO cell lines and treatments to characterize global transcriptome changes.
• To construct a gene co-expression network and assess impacts on recombinant protein and glycosylation gene expression.
• To identify molecular targets for improving CHO cell productivity and product quality.

Main Methods:

• Integration of three RNA-seq datasets from three CHO cell lines.
• Application of four industrially relevant treatments: serum-free adaptation, low temperature, low pH, and low glucose.
• Construction of a weighted gene co-expression network.
• Analysis of transcript abundance for anti-interleukin 8 (anti-IL8) immunoglobulin and glycosylation genes.

Main Results:

• Cholesterol biosynthesis upregulation is critical for serum-free adaptation, with Insig1 and Srebf2 as potential targets.
• Temperature-induced cell cycle arrest is mediated by p53 activation, involving key hub genes Zmat3 and Btg2.
• Glucose and pH treatments showed minimal impact on the overall transcriptome.
• Novel glycosylation-related gene responses and stable housekeeping genes for CHO cells were identified.

Conclusions:

• This study provides a comprehensive transcriptomic analysis of CHO cells under various stress conditions.
• Identified genes and pathways offer potential targets for enhancing biopharmaceutical production efficiency and quality.
• The findings contribute to a deeper understanding of CHO cell biology and provide tools for process optimization.