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• W3157536997 abstract "C1Q (Complement 1Q) is an important recognition molecule in the immunological complement system, which could also be putatively involved in the stress responses induced by endotoxins or exotoxins, potentially through detoxification processes. Marine bivalves are well adapted to highly complex aquatic environments with various stressors. As filter feeders, they have to cope with highly potent microalgae-derived neurotoxins, such as paralytic shellfish toxin (PSTs). Zhikong scallops, Chlamys farreri , are commercially important bivalve with the remarkable ability to accumulate PSTs. Exploring the C1Q s related to PST accumulation in C. farreri could benefit our understanding of the adaptations of bivalve species. In the present study, we systematically analyzed C1Q genes in C. farreri . In total, 97 CfC1Q genes mainly from the expanded C1Q-B subfamily were identified, from which the C1QL , C1QTNF , and C1QDC1 members in C. farreri were revealed to be under positive selection. Spatiotemporal expression analysis revealed that most CfC1QL s and CfC1QDC1 s were highly expressed during the post-umbo stage and in hepatopancreas, while most CfC1QTNF members were highly expressed after the creeping larva stage and in mantle. The hepatopancreas and kidney in C. farreri are two toxin-rich organs with the highest concentrations of PSTs, acting as major “centers” for toxin accumulation and transformation, respectively. Therefore, after feeding the scallops with PST-producing dinoflagellates Alexandrium minutum and Alexandrium catenella , we determined the expression patterns of CfC1Q s in these two organs. In kidney, more than 85% of CfC1QL s and CfC1QDC1 s showed drastic up-regulation with both diets. However, among these members with significant induction, a different response manner was detected after feeding with A. minutum and A. catenella , respectively as acute and chronic response patterns. In comparison, far fewer CfC1Q s showing significant up-regulation in hepatopancreas with both toxic diets and only mild regulation pattern could be found. This organ-, toxin-, and time-dependent genetic regulation of CfC1Q s may contribute to the virulence difference on account of the tissue-specific or dinoflagellate-specific different toxin analogs composition, implying the possible involvement of CfC1Q s in PST transport and homeostasis. Our findings imply the functional diversity of scallop C1Q genes in coping with PST accumulation, which might be developed as potential molecular indicators for monitoring toxin accumulation in edible mollusks or provide insight into the lineage-specific adaptation of scallops for dealing with microalgal toxin challenges." @default.
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• W3157536997 date "2021-05-03" @default.
• W3157536997 modified "2023-10-14" @default.
• W3157536997 title "Expansion of C1Q Genes in Zhikong Scallop and Their Expression Profiling After Exposure to the Toxic Dinoflagellates" @default.
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• W3157536997 doi "https://doi.org/10.3389/fmars.2021.640425" @default.
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