Project description:Two clones of Chinese hamster ovary (CHO) cells were cultured in 2 different chemical difined custom media. Transcriptional profile were compeared between clones and media.
Project description:Gene expression is a key determinant of phenotypes that made Chinese Hamster Ovary (CHO) cells, with their human-like glycosylation profile and high protein titers, one of the most widely used cells for the production of therapeutic proteins and biopharmaceuticals. Engineering CHO gene expression thus holds a key to improve drug quality and cost effective production. However, the success of engineering gene expression or ectopic activation of silent genes to optimize desired pathways requires accurate annotation of the underlying regulatory elements and the transcription start site (TSS). Unfortunately, to date, most TSSs of CHO-expressed genes and the ~50% of hamster genes that are silent in CHO were computationally predicted and are frequently inaccurate. To oust this hurdle, we report revised TSSs annotations for 15,308 Chinese Hamster genes and 4,145 non-coding RNAs based on experimental data from CHO K1 cells and 10 hamster tissues. In the example of the glycosyltransferase gene Mgat3, we further demonstrate how accurate annotations readily facilitate activating silent genes by CRISPRa. Together, we envision that our annotation and data from the Chinese Hamster will provide a rich resource for the CHO community, improve genome engineering efforts and additionally aid comparative and evolutionary studies.
Project description:MicroRNAs are small non-coding RNAs that play a critical role in post-transcriptional control of gene expression. Recent publications of genomic sequencing data from CHO cells provide new tools for the discovery of novel miRNAs in this important production system. The current release of the miRNA registry miRBase contains 307 mature miRNAs and 200 precursor sequences. We searched for evolutionary conserved miRNAs in recently published genomic data, derived from hamster and CHO cells, to further extend the list of known miRNAs. With our approach we could identify several dozens novel miRNAs and verify their expression with multiple next-generation sequencing experiments. In addition, a great amount of unexpressed miRNAs could be found, awaiting further confirmation by testing for their transcription in different Chinese hamster tissues. Two batch processes with 6 samples each
Project description:MicroRNAs are small non-coding RNAs that play a critical role in post-transcriptional control of gene expression. Recent publications of genomic sequencing data from CHO cells provide new tools for the discovery of novel miRNAs in this important production system. The current release of the miRNA registry miRBase contains 307 mature miRNAs and 200 precursor sequences. We searched for evolutionary conserved miRNAs in recently published genomic data, derived from hamster and CHO cells, to further extend the list of known miRNAs. With our approach we could identify several dozens novel miRNAs and verify their expression with multiple next-generation sequencing experiments. In addition, a great amount of unexpressed miRNAs could be found, awaiting further confirmation by testing for their transcription in different Chinese hamster tissues.
Project description:The effects of changes in bioprocessing parameters (temp, pH, DO) on anti-IL8 IgG1 producing Chinese hamster ovary (CHO) cells were studied on the level of host cell proteome expression using TMT-SPS-MS3.