Insulin-Like Peptide Receptor-Mediated Signaling Pathways Orchestrate Regulation of Growth in the Pacific Oyster ( Crassostrea gigas ), as Revealed by Gene Expression Profiles

• Published in: International Journal of Molecular Sciences
• Main Authors: Yongjing Li, Huiru Fu, Fuqiang Zhang, Liting Ren, Jing Tian, Qi Li, Shikai Liu
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI AG 2021
• Subjects: Crassostrea gigas; IIS; nutrient abundance; temperature; energy metabolism; Biology (General); QH301-705.5; Chemistry; QD1-999; Pacific; Pacific oyster
• Online Access: https://doi.org/10.3390/ijms22105259; https://doaj.org/article/60c1a4df92644ff5848c77905b48bf83

The involvement of insulin/insulin-like growth factor signaling (IIS) pathways in the growth regulation of marine invertebrates remains largely unexplored. In this study, we used a fast-growing Pacific oyster ( Crassostrea gigas ) variety “Haida No.1” as the material with which to unravel the role of IIS systems in growth regulation in oysters. Systematic bioinformatics analyses allowed us to identify major components of the IIS signaling pathway and insulin-like peptide receptor (ILPR)-mediated signaling pathways, including PI3K-AKT, RAS-MAPK, and TOR, in C. gigas . The expression levels of the major genes in IIS and its downstream signaling pathways were significantly higher in “Haida No.1” than in wild oysters, suggesting their involvement in the growth regulation of C. gigas . The expression profiles of IIS and its downstream signaling pathway genes were significantly altered by nutrient abundance and culture temperature. These results suggest that the IIS signaling pathway coupled with the ILPR-mediated signaling pathways orchestrate the regulation of energy metabolism to control growth in Pacific oysters.