Early life microbial exposures shape the Crassostrea gigas immune system for lifelong and intergenerational disease protection

• Published in: Microbiome
• Main Authors: Manon Fallet, Caroline Montagnani, Bruno Petton, Luc Dantan, Julien de Lorgeril, Sébastien Comarmond, Cristian Chaparro, Eve Toulza, Simon Boitard, Jean-Michel Escoubas, Agnès Vergnes, Jacqueline Le Grand, Ingo Bulla, Yannick Gueguen, Jérémie Vidal-Dupiol, Christoph Grunau, Guillaume Mitta, Céline Cosseau
• Format: Article in Journal/Newspaper
• Language: English
• Published: BMC 2022
• Subjects: Oyster; Aquaculture; Microbiota; Innate immune shaping; Epigenetic; DNA methylation; Microbial ecology; QR100-130; Pacific; Crassostrea gigas; Pacific oyster
• Online Access: https://doi.org/10.1186/s40168-022-01280-5; https://doaj.org/article/297fecc7f9314cc98ea991c74702f997

Abstract Background The interaction of organisms with their surrounding microbial communities influences many biological processes, a notable example of which is the shaping of the immune system in early life. In the Pacific oyster, Crassostrea gigas, the role of the environmental microbial community on immune system maturation — and, importantly, protection from infectious disease — is still an open question. Results Here, we demonstrate that early life microbial exposure durably improves oyster survival when challenged with the pathogen causing Pacific oyster mortality syndrome (POMS), both in the exposed generation and in the subsequent one. Combining microbiota, transcriptomic, genetic, and epigenetic analyses, we show that the microbial exposure induced changes in epigenetic marks and a reprogramming of immune gene expression leading to long-term and intergenerational immune protection against POMS. Conclusions We anticipate that this protection likely extends to additional pathogens and may prove to be an important new strategy for safeguarding oyster aquaculture efforts from infectious disease. tag the videobyte/videoabstract in this section Video Abstract