| No. | Title | Authors | Journal |
|---|---|---|---|
| 171 | Sea cucumbers and their symbiotic microbiome have evolved to feed on seabed sediments | Pan W, Wang X, Ren C, Jiang X, Gong S, Xie Z, Wong NK, Li X, Huang J, Fan D, Luo P, Yang Y, Ren X, Yu S, Qin Z, Wu X, Huo D, Ma B, Liu Y, Zhang X, E Z, Liang J, Sun H, Yuan L, Liu X, Cheng C, Long H, Li J, Wang Y, Hu C, Chen T | Nature communications 12(15): 1 |
Abstract
Sea cucumbers are predominant deposit feeders in benthic ecosystems, providing protective benefits to coral reefs by reducing disease prevalence. However, how they receive sufficient nutrition from seabed sediments remains poorly understood. Here, we investigate Holothuria leucospilota, an ecologically significant tropical sea cucumber, to elucidate digestive mechanisms underlying marine deposit-feeding. Genomic analysis reveals intriguing evolutionary adaptation characterized by an expansion of digestive carbohydrase genes and a contraction of digestive protease genes, suggesting specialization in digesting microalgae. Developmentally, two pivotal dietary shifts, namely, from endogenous nutrition to planktonic feeding, and from planktonic feeding to deposit feeding, induce changes in digestive tract enzyme profiles, with adults mainly expressing carbohydrases and lipases. A nuanced symbiotic relationship exists between gut microbiota and the host, namely, specific resident bacteria supply crucial enzymes for food digestion, while other bacteria are digested and provide assimilable nutrients. Our study further identifies Holothuroidea lineage-specific lysozymes that are restrictedly expressed in the intestines to support bacterial digestion. Overall, this work advances our knowledge of the evolutionary innovations in the sea cucumber digestive system which enable them to efficiently utilize nutrients from seabed sediments and promote food recycling within marine ecosystems.
Date : 2024.10.30.WED 18:00
Presenter : Jungwoo Lee
이정우 학생 주도 하에, 해삼의 Symbiotic microbiome에 대한 논문을 바탕으로 Discussion 하는 시간을 가졌습니다.
Sea cucumbers are predominant deposit feeders in benthic ecosystems, providing protective benefits to coral reefs by reducing disease prevalence. However, how they receive sufficient nutrition from seabed sediments remains poorly understood. Here, we investigate Holothuria leucospilota, an ecologically significant tropical sea cucumber, to elucidate digestive mechanisms underlying marine deposit-feeding. Genomic analysis reveals intriguing evolutionary adaptation characterized by an expansion of digestive carbohydrase genes and a contraction of digestive protease genes, suggesting specialization in digesting microalgae. Developmentally, two pivotal dietary shifts, namely, from endogenous nutrition to planktonic feeding, and from planktonic feeding to deposit feeding, induce changes in digestive tract enzyme profiles, with adults mainly expressing carbohydrases and lipases. A nuanced symbiotic relationship exists between gut microbiota and the host, namely, specific resident bacteria supply crucial enzymes for food digestion, while other bacteria are digested and provide assimilable nutrients. Our study further identifies Holothuroidea lineage-specific lysozymes that are restrictedly expressed in the intestines to support bacterial digestion. Overall, this work advances our knowledge of the evolutionary innovations in the sea cucumber digestive system which enable them to efficiently utilize nutrients from seabed sediments and promote food recycling within marine ecosystems.
Date : 2024.10.30.WED 18:00
Presenter : Jungwoo Lee
이정우 학생 주도 하에, 해삼의 Symbiotic microbiome에 대한 논문을 바탕으로 Discussion 하는 시간을 가졌습니다.