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<p>Domoic acid (DA) is a neurotoxin produced by certain species of <i>Pseudo-nitzschia</i> (<i>PSN</i>) that can cause damage to neural tissues and can be fatal to marine animals. Copepods, direct consumers of <i>PSN</i>, exhibit remarkable resistance to DA. Given that gut microbiota facilitate various detoxification processes in copepods, we hypothesize that gut microbiota may play a crucial role in aiding copepods in DA detoxification. In this study, we investigated the detoxification capability of copepod gut microbiota by feeding both wild-type and gut-microbiota-free <i>Acartia erythraea</i> toxic <i>PSN</i>. Our results demonstrated that the presence of gut microbiota enhanced the survival of copepods exposed to a DA diet. We subsequently feed <i>A. erythraea</i> both toxic and non-toxic <i>PSN,</i> and explored the potential mechanisms of DA detoxification through amplicon and metatranscriptome approaches. We identified <i>Aureispira</i> sp., <i>Oceanospirillum</i> sp., and <i>Tenacibaculum</i> sp. as key DA detoxification taxa because they not only exhibited high relative abundance in the toxic diet but also played an important role in two established DA biotransformation pathways. We speculate that the gut microbiota of <i>A. erythraea</i> transform DA into non-toxic substances through these two established pathways via decarboxylation, dehydrogenation, carboxylation, and multiple oxidation processes. Overall, our findings elucidate the mechanisms by which copepod gut microbiota detoxify DA, thereby advancing our understanding of copepod resilience in the face of a toxic diet.</p>

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Detoxification of domoic acid from Pseudo-nitzschia by gut microbiota in Acartia erythraea

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月13日

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  • Qihang Li,
  • Jiawei Chen,
  • Zhimeng Xu,
  • Lixia Deng,
  • Xihe Fang,
  • Shuwen Zhang,
  • Xiaodong Zhang,
  • Huo Xu,
  • Shen Lin,
  • Hongbin Liu

摘要

Domoic acid (DA) is a neurotoxin produced by certain species of Pseudo-nitzschia (PSN) that can cause damage to neural tissues and can be fatal to marine animals. Copepods, direct consumers of PSN, exhibit remarkable resistance to DA. Given that gut microbiota facilitate various detoxification processes in copepods, we hypothesize that gut microbiota may play a crucial role in aiding copepods in DA detoxification. In this study, we investigated the detoxification capability of copepod gut microbiota by feeding both wild-type and gut-microbiota-free Acartia erythraea toxic PSN. Our results demonstrated that the presence of gut microbiota enhanced the survival of copepods exposed to a DA diet. We subsequently feed A. erythraea both toxic and non-toxic PSN, and explored the potential mechanisms of DA detoxification through amplicon and metatranscriptome approaches. We identified Aureispira sp., Oceanospirillum sp., and Tenacibaculum sp. as key DA detoxification taxa because they not only exhibited high relative abundance in the toxic diet but also played an important role in two established DA biotransformation pathways. We speculate that the gut microbiota of A. erythraea transform DA into non-toxic substances through these two established pathways via decarboxylation, dehydrogenation, carboxylation, and multiple oxidation processes. Overall, our findings elucidate the mechanisms by which copepod gut microbiota detoxify DA, thereby advancing our understanding of copepod resilience in the face of a toxic diet.