Exosome-derived small non-coding RNAs reveal immune response upon grafting transplantation in Pinctada fucata (Mollusca)

• Published in: Open biology Vol. 12; no. 5; p. 210317
• Main Authors: Huang, Songqian, Nishiumi, Shinya, Asaduzzaman, Md, Pan, Yida, Liu, Guanting, Yoshitake, Kazutoshi, Maeyama, Kaoru, Kinoshita, Shigeharu, Nagai, Kiyohito, Watabe, Shugo, Yoshida, Tetsuhiko, Asakawa, Shuichi
• Format: Journal Article
• Language: English
• Published: England The Royal Society 01.05.2022
• Subjects: Animals; exosome; Exosomes - genetics; Exosomes - metabolism; immune response; Immunity; MicroRNAs - genetics; miRNA; Pinctada - genetics; Pinctada - metabolism; Pinctada fucata; piRNA; RNA, Small Interfering - genetics; RNA, Small Interfering - metabolism; RNA, Small Untranslated; small non-coding RNAs; miRNA; small non-coding RNAs; immune response; Pinctada fucata; exosome; piRNA
• ISSN: 2046-2441; 2046-2441
• DOI: 10.1098/rsob.210317

Exosomes, a subset of small extracellular vesicles, carry various nucleic acids, proteins, lipids, amino acids and metabolites. They function as a mode of intercellular communication and molecular transfer. Exosome cargo molecules, including small non-coding RNAs (sncRNAs), are involved in the immune response in various organisms. However, the role of exosome-derived sncRNAs in immune responses in molluscs remains unclear. Here, we aimed to reveal the sncRNAs involved in the immune response during grafting transplantation by the pearl oyster . Exosomes were successfully extracted from the haemolymph during graft transplantation. Abundant microRNAs (miRNAs) and PIWI-interacting RNAs (piRNAs) were simultaneously discovered in exosomes by small RNA sequencing. The expression patterns of the miRNAs and piRNAs at the grafting and initial stages were not substantially different, but varied significantly between the initial and later stages. Target prediction and functional analysis indicate that these miRNAs and piRNAs are related to immune response upon grafting transplantation, whereas piRNAs may also be associated with transposon silencing by targeting with genome transposon elements. This work provides the basis for a functional understanding of exosome-derived sncRNAs and helps to gain further insight into the PIWI/piRNA pathway function outside of germline cells in molluscs.