Microbial profiling and single-cell transcriptomics reveal probiotic mechanisms of coral thermal resilience
Lu, C.-Y.; Chang, Y.-P.; Pinon-Gonzalez, V. M.; Lewin, T. D.; Shih, K.-N.; Chuang, P.-S.; Wada, N.; Yu, S.-P.; Yu, Z.-R.; Chen, Y.-H.; Chen, M.; Chin, C.-H.; Chiou, Y.-J.; Chiu, Y.-L.; Liao, I. J.-Y.; Chang, H.-F.; Yen, J.-H.; Lu, M.-Y. J.; Luo, Y.-J.; Tang, S.-L.
Show abstract
Probiotics hold promise for enhancing coral resilience under climate-driven thermal stress, yet their mechanisms remain poorly understood. Here, we evaluate two Endozoicomonas species as coral probiotics and characterize their effects on microbial communities and host gene expression. We show that E. acroporae Acr-14T enhances thermal tolerance in Stylophora pistillata, suppresses opportunistic pathogens, and promotes beneficial microbes. To facilitate transcriptomic profiling, we assembled a chromosome-level genome of S. pistillata clade 1 (Pacific lineage) and used it to reveal that E. acroporae Acr-14T mitigates heat-induced protein-folding stress and supports host energy homeostasis. Single-cell transcriptomics further uncovered enhanced pro-survival signaling and modulation of the S-adenosylmethionine (SAMe) synthesis pathway. Together, our findings identify E. acroporae Acr-14T as a robust coral probiotic and provide mechanistic insights into host-microbe interactions that promote coral resilience under thermal stress.
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