Evaluation of expression systems for recombinant protein production in chicken egg bioreactors

Abstract

Chicken eggs have gained attention as excellent bioreactors because of their genetic modifications. However, the development of chicken egg bioreactors requires a long time from the construction of the production system to the evaluation of the products. Therefore, in this study, we established a chicken cell line producing ovalbumin (OVA) and constructed a system for the rapid evaluation of the production system. First, we knocked in the EF1α promoter upstream of the OVA locus in chicken DF‐1 cells for continuous OVA expression. Furthermore, we analyzed and identified an ideal position at the OVA locus for the insertion of useful protein genes to maximize recombinant protein yield. We found that knocking in the EF1α promoter upstream of exon1 yielded the maximum production of OVA protein. In addition, we found that production efficiency was higher with linking a recombinant hFGF2 cDNA to the 5′ side of the OVA.Therefore, we established an OVA expressing cell line and an evaluation system for proteins in chicken egg bioreactors. Our findings may improve the efficiency of chicken expression systems and expand their applications in protein production. This article is protected by copyright. All rights reserved

Recombinant human fibroblast growth factor 7 obtained from stable Chinese hamster ovary cells enhances wound healing

“…[6,7] During the granulation process of tissue development, various immune cells, including macrophages, mast cells, and T lymphocytes, secrete FGFs, leading to an increased FGF concentration at the wound site. [8][9][10] In turn, this promotes the growth of fibroblasts, epithelial cells, and keratinocytes, facilitating angiogenesis, epithelialization, and collagen formation, all of which contributes to promoting the wound healing process. [11][12][13][14] FGF7 is widely regarded as a significant growth factor for wound healing.…”